Commit Graph

4380 Commits

Author SHA1 Message Date
Olga Kornievskaia d3abc73987 sunrpc: keep track of the xprt_class in rpc_xprt structure
We need to keep track of the type for a given transport.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Olga Kornievskaia 5b9268727f sunrpc: add IDs to multipath
This is used to uniquely identify sunrpc multipath objects in /sys.

Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Olga Kornievskaia 572caba402 sunrpc: add xprt id
This adds a unique identifier for a sunrpc transport in sysfs, which is
similarly managed to the unique IDs of clients.

Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Olga Kornievskaia c5a382ebdb sunrpc: Create per-rpc_clnt sysfs kobjects
These will eventually have files placed under them for sysfs operations.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Olga Kornievskaia c441f125de sunrpc: Create a client/ subdirectory in the sunrpc sysfs
For network namespace separation.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Olga Kornievskaia 746787489b sunrpc: Create a sunrpc directory under /sys/kernel/
This is where we'll put per-rpc_client related files

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-07-08 14:03:23 -04:00
Linus Torvalds 0cc2ea8ceb Some highlights:
- add tracepoints for callbacks and for client creation and
 	  destruction
 	- cache the mounts used for server-to-server copies
 	- expose callback information in /proc/fs/nfsd/clients/*/info
 	- don't hold locks unnecessarily while waiting for commits
 	- update NLM to use xdr_stream, as we have for NFSv2/v3/v4
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Merge tag 'nfsd-5.14' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:

 - add tracepoints for callbacks and for client creation and destruction

 - cache the mounts used for server-to-server copies

 - expose callback information in /proc/fs/nfsd/clients/*/info

 - don't hold locks unnecessarily while waiting for commits

 - update NLM to use xdr_stream, as we have for NFSv2/v3/v4

* tag 'nfsd-5.14' of git://linux-nfs.org/~bfields/linux: (69 commits)
  nfsd: fix NULL dereference in nfs3svc_encode_getaclres
  NFSD: Prevent a possible oops in the nfs_dirent() tracepoint
  nfsd: remove redundant assignment to pointer 'this'
  nfsd: Reduce contention for the nfsd_file nf_rwsem
  lockd: Update the NLMv4 SHARE results encoder to use struct xdr_stream
  lockd: Update the NLMv4 nlm_res results encoder to use struct xdr_stream
  lockd: Update the NLMv4 TEST results encoder to use struct xdr_stream
  lockd: Update the NLMv4 void results encoder to use struct xdr_stream
  lockd: Update the NLMv4 FREE_ALL arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 SHARE arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 SM_NOTIFY arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 nlm_res arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 UNLOCK arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 CANCEL arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 LOCK arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 void arguments decoder to use struct xdr_stream
  lockd: Update the NLMv1 SHARE results encoder to use struct xdr_stream
  lockd: Update the NLMv1 nlm_res results encoder to use struct xdr_stream
  lockd: Update the NLMv1 TEST results encoder to use struct xdr_stream
  ...
2021-07-07 12:50:08 -07:00
Colin Ian King f6260b98ec rpc: remove redundant initialization of variable status
The variable status is being initialized with a value that is never
read, the assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-06 20:14:42 -04:00
Zheng Yongjun d50295255e xprtrdma: Fix spelling mistakes
Fix some spelling mistakes in comments:
succes  ==> success

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-06 20:14:41 -04:00
Linus Torvalds a15286c63d Locking changes for this cycle:
- Core locking & atomics:
 
      - Convert all architectures to ARCH_ATOMIC: move every
        architecture to ARCH_ATOMIC, then get rid of ARCH_ATOMIC
        and all the transitory facilities and #ifdefs.
 
        Much reduction in complexity from that series:
 
            63 files changed, 756 insertions(+), 4094 deletions(-)
 
      - Self-test enhancements
 
  - Futexes:
 
      - Add the new FUTEX_LOCK_PI2 ABI, which is a variant that
        doesn't set FLAGS_CLOCKRT (.e. uses CLOCK_MONOTONIC).
 
        [ The temptation to repurpose FUTEX_LOCK_PI's implicit
          setting of FLAGS_CLOCKRT & invert the flag's meaning
          to avoid having to introduce a new variant was
          resisted successfully. ]
 
      - Enhance futex self-tests
 
  - Lockdep:
 
      - Fix dependency path printouts
      - Optimize trace saving
      - Broaden & fix wait-context checks
 
  - Misc cleanups and fixes.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking updates from Ingo Molnar:

 - Core locking & atomics:

     - Convert all architectures to ARCH_ATOMIC: move every architecture
       to ARCH_ATOMIC, then get rid of ARCH_ATOMIC and all the
       transitory facilities and #ifdefs.

       Much reduction in complexity from that series:

           63 files changed, 756 insertions(+), 4094 deletions(-)

     - Self-test enhancements

 - Futexes:

     - Add the new FUTEX_LOCK_PI2 ABI, which is a variant that doesn't
       set FLAGS_CLOCKRT (.e. uses CLOCK_MONOTONIC).

       [ The temptation to repurpose FUTEX_LOCK_PI's implicit setting of
         FLAGS_CLOCKRT & invert the flag's meaning to avoid having to
         introduce a new variant was resisted successfully. ]

     - Enhance futex self-tests

 - Lockdep:

     - Fix dependency path printouts

     - Optimize trace saving

     - Broaden & fix wait-context checks

 - Misc cleanups and fixes.

* tag 'locking-core-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
  locking/lockdep: Correct the description error for check_redundant()
  futex: Provide FUTEX_LOCK_PI2 to support clock selection
  futex: Prepare futex_lock_pi() for runtime clock selection
  lockdep/selftest: Remove wait-type RCU_CALLBACK tests
  lockdep/selftests: Fix selftests vs PROVE_RAW_LOCK_NESTING
  lockdep: Fix wait-type for empty stack
  locking/selftests: Add a selftest for check_irq_usage()
  lockding/lockdep: Avoid to find wrong lock dep path in check_irq_usage()
  locking/lockdep: Remove the unnecessary trace saving
  locking/lockdep: Fix the dep path printing for backwards BFS
  selftests: futex: Add futex compare requeue test
  selftests: futex: Add futex wait test
  seqlock: Remove trailing semicolon in macros
  locking/lockdep: Reduce LOCKDEP dependency list
  locking/lockdep,doc: Improve readability of the block matrix
  locking/atomics: atomic-instrumented: simplify ifdeffery
  locking/atomic: delete !ARCH_ATOMIC remnants
  locking/atomic: xtensa: move to ARCH_ATOMIC
  locking/atomic: sparc: move to ARCH_ATOMIC
  locking/atomic: sh: move to ARCH_ATOMIC
  ...
2021-06-28 11:45:29 -07:00
Zhang Xiaoxu 5483b904bf SUNRPC: Should wake up the privileged task firstly.
When find a task from wait queue to wake up, a non-privileged task may
be found out, rather than the privileged. This maybe lead a deadlock
same as commit dfe1fe75e0 ("NFSv4: Fix deadlock between nfs4_evict_inode()
and nfs4_opendata_get_inode()"):

Privileged delegreturn task is queued to privileged list because all
the slots are assigned. If there has no enough slot to wake up the
non-privileged batch tasks(session less than 8 slot), then the privileged
delegreturn task maybe lost waked up because the found out task can't
get slot since the session is on draining.

So we should treate the privileged task as the emergency task, and
execute it as for as we can.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 5fcdfacc01 ("NFSv4: Return delegations synchronously in evict_inode")
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-06-28 09:34:39 -04:00
Zhang Xiaoxu fcb170a9d8 SUNRPC: Fix the batch tasks count wraparound.
The 'queue->nr' will wraparound from 0 to 255 when only current
priority queue has tasks. This maybe lead a deadlock same as commit
dfe1fe75e0 ("NFSv4: Fix deadlock between nfs4_evict_inode()
and nfs4_opendata_get_inode()"):

Privileged delegreturn task is queued to privileged list because all
the slots are assigned. When non-privileged task complete and release
the slot, a non-privileged maybe picked out. It maybe allocate slot
failed when the session on draining.

If the 'queue->nr' has wraparound to 255, and no enough slot to
service it, then the privileged delegreturn will lost to wake up.

So we should avoid the wraparound on 'queue->nr'.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 5fcdfacc01 ("NFSv4: Return delegations synchronously in evict_inode")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-06-28 09:34:39 -04:00
NeilBrown bc1c56e9bb SUNRPC: prevent port reuse on transports which don't request it.
If an RPC client is created without RPC_CLNT_CREATE_REUSEPORT, it should
not reuse the source port when a TCP connection is re-established.
This is currently implemented by preventing the source port being
recorded after a successful connection (the call to xs_set_srcport()).

However the source port is also recorded after a successful bind in xs_bind().
This may not be needed at all and certainly is not wanted when
RPC_CLNT_CREATE_REUSEPORT wasn't requested.

So avoid that assignment when xprt.reuseport is not set.

With this change, NFSv4.1 and later mounts use a different port number on
each connection.  This is helpful with some firewalls which don't cope
well with port reuse.

Signed-off-by: NeilBrown <neilb@suse.de>
Fixes: e6237b6feb ("NFSv4.1: Don't rebind to the same source port when reconnecting to the server")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-06-21 12:06:16 -04:00
Colin Ian King bb24cc0f37 rpc: remove redundant initialization of variable status
The variable status is being initialized with a value that is never
read, the assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-06-21 12:06:16 -04:00
Anna Schumaker 6d1c0f3d28 sunrpc: Avoid a KASAN slab-out-of-bounds bug in xdr_set_page_base()
This seems to happen fairly easily during READ_PLUS testing on NFS v4.2.
I found that we could end up accessing xdr->buf->pages[pgnr] with a pgnr
greater than the number of pages in the array. So let's just return
early if we're setting base to a point at the end of the page data and
let xdr_set_tail_base() handle setting up the buffer pointers instead.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Fixes: 8d86e373b0 ("SUNRPC: Clean up helpers xdr_set_iov() and xdr_set_page_base()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-06-13 19:36:49 -04:00
Chuck Lever ae605ee983 xprtrdma: Revert 586a0787ce
Commit 9ed5af268e ("SUNRPC: Clean up the handling of page padding
in rpc_prepare_reply_pages()") [Dec 2020] affects RPC Replies that
have a data payload (i.e., Write chunks).

rpcrdma_prepare_readch(), as its name suggests, sets up Read chunks
which are data payloads within RPC Calls. Those payloads are
constructed by xdr_write_pages(), which continues to stuff the call
buffer's tail kvec with the payload's XDR roundup. Thus removing
the tail buffer logic in rpcrdma_prepare_readch() was the wrong
thing to do.

Fixes: 586a0787ce ("xprtrdma: Clean up rpcrdma_prepare_readch()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-27 08:46:19 -04:00
Mark Rutland 201e2c1bbe locking/atomic: net: use linux/atomic.h for xchg & cmpxchg
As xchg*() and cmpxchg*() may be instrumented by atomic-instrumented.h,
it's necessary to include <linux/atomic.h> to use these, rather than
<asm/cmpxchg.h>, which is effectively an arch-internal header.

In a couple of places we include <asm/cmpxchg.h>, but get away with this
as <linux/atomic.h> gets pulled in inidrectly by another include. Before
we convert more architectures to use atomic-instrumented.h, let's fix
these up to use <linux/atomic.h> so that we don't make things more
fragile.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-3-mark.rutland@arm.com
2021-05-26 13:20:49 +02:00
Trond Myklebust e86be3a04b SUNRPC: More fixes for backlog congestion
Ensure that we fix the XPRT_CONGESTED starvation issue for RDMA as well
as socket based transports.
Ensure we always initialise the request after waking up from the backlog
list.

Fixes: e877a88d1f ("SUNRPC in case of backlog, hand free slots directly to waiting task")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-26 06:36:13 -04:00
Trond Myklebust d275880abc SUNRPC: Fix Oops in xs_tcp_send_request() when transport is disconnected
If a disconnection occurs while we're trying to reply to a server
callback, then we may end up calling xs_tcp_send_request() with a NULL
value for transport->inet, which trips up the call to
tcp_sock_set_cork().

Fixes: d737e5d418 ("SUNRPC: Set TCP_CORK until the transmit queue is empty")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-20 12:17:08 -04:00
NeilBrown e877a88d1f SUNRPC in case of backlog, hand free slots directly to waiting task
If sunrpc.tcp_max_slot_table_entries is small and there are tasks
on the backlog queue, then when a request completes it is freed and the
first task on the queue is woken.  The expectation is that it will wake
and claim that request.  However if it was a sync task and the waiting
process was killed at just that moment, it will wake and NOT claim the
request.

As long as TASK_CONGESTED remains set, requests can only be claimed by
tasks woken from the backlog, and they are woken only as requests are
freed, so when a task doesn't claim a request, no other task can ever
get that request until TASK_CONGESTED is cleared.  Each time this
happens the number of available requests is decreased by one.

With a sufficiently high workload and sufficiently low setting of
max_slot (16 in the case where this was seen), TASK_CONGESTED can remain
set for an extended period, and the above scenario (of a process being
killed just as its task was woken) can repeat until no requests can be
allocated.  Then traffic stops.

This patch addresses the problem by introducing a positive handover of a
request from a completing task to a backlog task - the request is never
freed when there is a backlog.

When a task is woken it might not already have a request attached in
which case it is *not* freed (as with current code) but is initialised
(if needed) and used.  If it isn't used it will eventually be freed by
rpc_exit_task().  xprt_release() is enhanced to be able to correctly
release an uninitialised request.

Fixes: ba60eb25ff ("SUNRPC: Fix a livelock problem in the xprt->backlog queue")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-20 12:17:08 -04:00
Linus Torvalds a647034fe2 NFS client updates for Linux 5.13
Highlights include:
 
 Stable fixes:
 - Add validation of the UDP retrans parameter to prevent shift out-of-bounds
 - Don't discard pNFS layout segments that are marked for return
 
 Bugfixes:
 - Fix a NULL dereference crash in xprt_complete_bc_request() when the
   NFSv4.1 server misbehaves.
 - Fix the handling of NFS READDIR cookie verifiers
 - Sundry fixes to ensure attribute revalidation works correctly when the
   server does not return post-op attributes.
 - nfs4_bitmask_adjust() must not change the server global bitmasks
 - Fix major timeout handling in the RPC code.
 - NFSv4.2 fallocate() fixes.
 - Fix the NFSv4.2 SEEK_HOLE/SEEK_DATA end-of-file handling
 - Copy offload attribute revalidation fixes
 - Fix an incorrect filehandle size check in the pNFS flexfiles driver
 - Fix several RDMA transport setup/teardown races
 - Fix several RDMA queue wrapping issues
 - Fix a misplaced memory read barrier in sunrpc's call_decode()
 
 Features:
 - Micro optimisation of the TCP transmission queue using TCP_CORK
 - statx() performance improvements by further splitting up the tracking
   of invalid cached file metadata.
 - Support the NFSv4.2 "change_attr_type" attribute and use it to
   optimise handling of change attribute updates.
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Merge tag 'nfs-for-5.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Stable fixes:

   - Add validation of the UDP retrans parameter to prevent shift
     out-of-bounds

   - Don't discard pNFS layout segments that are marked for return

  Bugfixes:

   - Fix a NULL dereference crash in xprt_complete_bc_request() when the
     NFSv4.1 server misbehaves.

   - Fix the handling of NFS READDIR cookie verifiers

   - Sundry fixes to ensure attribute revalidation works correctly when
     the server does not return post-op attributes.

   - nfs4_bitmask_adjust() must not change the server global bitmasks

   - Fix major timeout handling in the RPC code.

   - NFSv4.2 fallocate() fixes.

   - Fix the NFSv4.2 SEEK_HOLE/SEEK_DATA end-of-file handling

   - Copy offload attribute revalidation fixes

   - Fix an incorrect filehandle size check in the pNFS flexfiles driver

   - Fix several RDMA transport setup/teardown races

   - Fix several RDMA queue wrapping issues

   - Fix a misplaced memory read barrier in sunrpc's call_decode()

  Features:

   - Micro optimisation of the TCP transmission queue using TCP_CORK

   - statx() performance improvements by further splitting up the
     tracking of invalid cached file metadata.

   - Support the NFSv4.2 'change_attr_type' attribute and use it to
     optimise handling of change attribute updates"

* tag 'nfs-for-5.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (85 commits)
  xprtrdma: Fix a NULL dereference in frwr_unmap_sync()
  sunrpc: Fix misplaced barrier in call_decode
  NFSv4.2: Remove ifdef CONFIG_NFSD from NFSv4.2 client SSC code.
  xprtrdma: Move fr_mr field to struct rpcrdma_mr
  xprtrdma: Move the Work Request union to struct rpcrdma_mr
  xprtrdma: Move fr_linv_done field to struct rpcrdma_mr
  xprtrdma: Move cqe to struct rpcrdma_mr
  xprtrdma: Move fr_cid to struct rpcrdma_mr
  xprtrdma: Remove the RPC/RDMA QP event handler
  xprtrdma: Don't display r_xprt memory addresses in tracepoints
  xprtrdma: Add an rpcrdma_mr_completion_class
  xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation
  xprtrdma: Avoid Send Queue wrapping
  xprtrdma: Do not wake RPC consumer on a failed LocalInv
  xprtrdma: Do not recycle MR after FastReg/LocalInv flushes
  xprtrdma: Clarify use of barrier in frwr_wc_localinv_done()
  xprtrdma: Rename frwr_release_mr()
  xprtrdma: rpcrdma_mr_pop() already does list_del_init()
  xprtrdma: Delete rpcrdma_recv_buffer_put()
  xprtrdma: Fix cwnd update ordering
  ...
2021-05-07 11:23:41 -07:00
Linus Torvalds a79cdfba68 Additional fixes and clean-ups for NFSD since tags/nfsd-5.13,
including a fix to grant read delegations for files open for
 writing.
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Merge tag 'nfsd-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull more nfsd updates from Chuck Lever:
 "Additional fixes and clean-ups for NFSD since tags/nfsd-5.13,
  including a fix to grant read delegations for files open for writing"

* tag 'nfsd-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: Fix null pointer dereference in svc_rqst_free()
  SUNRPC: fix ternary sign expansion bug in tracing
  nfsd: Fix fall-through warnings for Clang
  nfsd: grant read delegations to clients holding writes
  nfsd: reshuffle some code
  nfsd: track filehandle aliasing in nfs4_files
  nfsd: hash nfs4_files by inode number
  nfsd: ensure new clients break delegations
  nfsd: removed unused argument in nfsd_startup_generic()
  nfsd: remove unused function
  svcrdma: Pass a useful error code to the send_err tracepoint
  svcrdma: Rename goto labels in svc_rdma_sendto()
  svcrdma: Don't leak send_ctxt on Send errors
2021-05-05 13:44:19 -07:00
Chuck Lever 9e895cd964 xprtrdma: Fix a NULL dereference in frwr_unmap_sync()
The normal mechanism that invalidates and unmaps MRs is
frwr_unmap_async(). frwr_unmap_sync() is used only when an RPC
Reply bearing Write or Reply chunks has been lost (ie, almost
never).

Coverity found that after commit 9a301cafc8 ("xprtrdma: Move
fr_linv_done field to struct rpcrdma_mr"), the while() loop in
frwr_unmap_sync() exits only once @mr is NULL, unconditionally
causing subsequent dereferences of @mr to Oops.

I've tested this fix by creating a client that skips invoking
frwr_unmap_async() when RPC Replies complete. That forces all
invalidation tasks to fall upon frwr_unmap_sync(). Simple workloads
with this fix applied to the adulterated client work as designed.

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1504556 ("Null pointer dereferences")
Fixes: 9a301cafc8 ("xprtrdma: Move fr_linv_done field to struct rpcrdma_mr")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-01 19:42:22 -04:00
Baptiste Lepers f8f7e0fb22 sunrpc: Fix misplaced barrier in call_decode
Fix a misplaced barrier in call_decode. The struct rpc_rqst is modified
as follows by xprt_complete_rqst:

req->rq_private_buf.len = copied;
/* Ensure all writes are done before we update */
/* req->rq_reply_bytes_recvd */
smp_wmb();
req->rq_reply_bytes_recvd = copied;

And currently read as follows by call_decode:

smp_rmb(); // misplaced
if (!req->rq_reply_bytes_recvd)
   goto out;
req->rq_rcv_buf.len = req->rq_private_buf.len;

This patch places the smp_rmb after the if to ensure that
rq_reply_bytes_recvd and rq_private_buf.len are read in order.

Fixes: 9ba828861c ("SUNRPC: Don't try to parse incomplete RPC messages")
Signed-off-by: Baptiste Lepers <baptiste.lepers@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-05-01 19:42:14 -04:00
Chuck Lever f6e70aab9d SUNRPC: refresh rq_pages using a bulk page allocator
Reduce the rate at which nfsd threads hammer on the page allocator.  This
improves throughput scalability by enabling the threads to run more
independently of each other.

[mgorman: Update interpretation of alloc_pages_bulk return value]

Link: https://lkml.kernel.org/r/20210325114228.27719-8-mgorman@techsingularity.net
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Alexander Lobakin <alobakin@pm.me>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David Miller <davem@davemloft.net>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-04-30 11:20:43 -07:00
Chuck Lever ab8362645f SUNRPC: set rq_page_end differently
Patch series "SUNRPC consumer for the bulk page allocator"

This patch set and the measurements below are based on yesterday's
bulk allocator series:

  git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-bulk-rebase-v5r9

The patches change SUNRPC to invoke the array-based bulk allocator
instead of alloc_page().

The micro-benchmark results are promising.  I ran a mixture of 256KB
reads and writes over NFSv3.  The server's kernel is built with KASAN
enabled, so the comparison is exaggerated but I believe it is still
valid.

I instrumented svc_recv() to measure the latency of each call to
svc_alloc_arg() and report it via a trace point.  The following results
are averages across the trace events.

  Single page: 25.007 us per call over 532,571 calls
  Bulk list:    6.258 us per call over 517,034 calls
  Bulk array:   4.590 us per call over 517,442 calls

This patch (of 2)

Refactor:

I'm about to use the loop variable @i for something else.

As far as the "i++" is concerned, that is a post-increment. The
value of @i is not used subsequently, so the increment operator
is unnecessary and can be removed.

Also note that nfsd_read_actor() was renamed nfsd_splice_actor()
by commit cf8208d0ea ("sendfile: convert nfsd to
splice_direct_to_actor()").

Link: https://lkml.kernel.org/r/20210325114228.27719-7-mgorman@techsingularity.net
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Alexander Lobakin <alobakin@pm.me>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David Miller <davem@davemloft.net>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-04-30 11:20:43 -07:00
Chuck Lever 13bcf7e32a xprtrdma: Move fr_mr field to struct rpcrdma_mr
Clean up: The last remaining field in struct rpcrdma_frwr has been
removed, so the struct can be eliminated.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:27:23 -04:00
Chuck Lever dcff9ed209 xprtrdma: Move the Work Request union to struct rpcrdma_mr
Clean up.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:27:13 -04:00
Chuck Lever 9a301cafc8 xprtrdma: Move fr_linv_done field to struct rpcrdma_mr
Clean up: Move more of struct rpcrdma_frwr into its parent.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:27:06 -04:00
Chuck Lever e10fa96d34 xprtrdma: Move cqe to struct rpcrdma_mr
Clean up.

- Simplify variable initialization in the completion handlers.

- Move another field out of struct rpcrdma_frwr.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:27:00 -04:00
Chuck Lever 0a26d10e30 xprtrdma: Move fr_cid to struct rpcrdma_mr
Clean up (for several purposes):

- The MR's cid is initialized sooner so that tracepoints can show
  something reasonable even if the MR is never posted.
- The MR's res.id doesn't change so the cid won't change either.
  Initializing the cid once is sufficient.
- struct rpcrdma_frwr is going away soon.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:26:53 -04:00
Chuck Lever e1648eb23d xprtrdma: Remove the RPC/RDMA QP event handler
Clean up: The handler only recorded a trace event. If indeed no
action is needed by the RPC/RDMA consumer, then the event can be
ignored.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:26:31 -04:00
Chuck Lever 4ddd0fc32c xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation
The Send signaling logic is a little subtle, so add some
observability around it. For every xprtrdma_mr_fastreg event, there
should be an xprtrdma_mr_localinv or xprtrdma_mr_reminv event.

When these tracepoints are enabled, we can see exactly when an MR is
DMA-mapped, registered, invalidated (either locally or remotely) and
then DMA-unmapped.

   kworker/u25:2-190   [000]   787.979512: xprtrdma_mr_map:      task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
   kworker/u25:2-190   [000]   787.979515: xprtrdma_chunk_read:  task:351@5 pos=148 5608@0x8679e0c8f6f56000:0x00000503 (last)
   kworker/u25:2-190   [000]   787.979519: xprtrdma_marshal:     task:351@5 xid=0x8679e0c8: hdr=52 xdr=148/5608/0 read list/inline
   kworker/u25:2-190   [000]   787.979525: xprtrdma_mr_fastreg:  task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
   kworker/u25:2-190   [000]   787.979526: xprtrdma_post_send:   task:351@5 cq.id=0 cid=73 (2 SGEs)

 ...

    kworker/5:1H-219   [005]   787.980567: xprtrdma_wc_receive:  cq.id=1 cid=161 status=SUCCESS (0/0x0) received=164
    kworker/5:1H-219   [005]   787.980571: xprtrdma_post_recvs:  peer=[192.168.100.55]:20049 r_xprt=0xffff8884974d4000: 0 new recvs, 70 active (rc 0)
    kworker/5:1H-219   [005]   787.980573: xprtrdma_reply:       task:351@5 xid=0x8679e0c8 credits=64
    kworker/5:1H-219   [005]   787.980576: xprtrdma_mr_reminv:   task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
    kworker/5:1H-219   [005]   787.980577: xprtrdma_mr_unmap:    mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)

Note that I've moved the xprtrdma_post_send tracepoint so that event
always appears after the xprtrdma_mr_fastreg tracepoint. Otherwise
the event log looks counterintuitive (FastReg is always supposed to
happen before Send).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:25:58 -04:00
Chuck Lever b3ce7a25f4 xprtrdma: Avoid Send Queue wrapping
Send WRs can be signalled or unsignalled. A signalled Send WR
always has a matching Send completion, while a unsignalled Send
has a completion only if the Send WR fails.

xprtrdma has a Send account mechanism that is designed to reduce
the number of signalled Send WRs. This in turn mitigates the
interrupt rate of the underlying device.

RDMA consumers can't leave all Sends unsignaled, however, because
providers rely on Send completions to maintain their Send Queue head
and tail pointers. xprtrdma counts the number of unsignaled Send WRs
that have been posted to ensure that Sends are signalled often
enough to prevent the Send Queue from wrapping.

This mechanism neglected to account for FastReg WRs, which are
posted on the Send Queue but never signalled. As a result, the
Send Queue wrapped on occasion, resulting in duplication completions
of FastReg and LocalInv WRs.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:25:43 -04:00
Chuck Lever 8a053433de xprtrdma: Do not wake RPC consumer on a failed LocalInv
Throw away any reply where the LocalInv flushes or could not be
posted. The registered memory region is in an unknown state until
the disconnect completes.

rpcrdma_xprt_disconnect() will find and release the MR. No need to
put it back on the MR free list in this case.

The client retransmits pending RPC requests once it reestablishes a
fresh connection, so a replacement reply should be forthcoming on
the next connection instance.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:25:19 -04:00
Chuck Lever e4b52ca013 xprtrdma: Do not recycle MR after FastReg/LocalInv flushes
Better not to touch MRs involved in a flush or post error until the
Send and Receive Queues are drained and the transport is fully
quiescent. Simply don't insert such MRs back onto the free list.
They remain on mr_all and will be released when the connection is
torn down.

I had thought that recycling would prevent hardware resources from
being tied up for a long time. However, since v5.7, a transport
disconnect destroys the QP and other hardware-owned resources. The
MRs get cleaned up nicely at that point.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:25:12 -04:00
Chuck Lever 44438ad9ae xprtrdma: Clarify use of barrier in frwr_wc_localinv_done()
Clean up: The comment and the placement of the memory barrier is
confusing. Humans want to read the function statements from head
to tail.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:24:47 -04:00
Chuck Lever f912af77e2 xprtrdma: Rename frwr_release_mr()
Clean up: To be consistent with other functions in this source file,
follow the naming convention of putting the object being acted upon
before the action itself.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:24:29 -04:00
Chuck Lever 1363e6388c xprtrdma: rpcrdma_mr_pop() already does list_del_init()
The rpcrdma_mr_pop() earlier in the function has already cleared
out mr_list, so it must not be done again in the error path.

Fixes: 847568942f ("xprtrdma: Remove fr_state")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:24:22 -04:00
Chuck Lever c35ca60d49 xprtrdma: Delete rpcrdma_recv_buffer_put()
Clean up: The name recv_buffer_put() is a vestige of older code,
and the function is just a wrapper for the newer rpcrdma_rep_put().
In most of the existing call sites, a pointer to the owning
rpcrdma_buffer is already available.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:24:12 -04:00
Chuck Lever 35d8b10a25 xprtrdma: Fix cwnd update ordering
After a reconnect, the reply handler is opening the cwnd (and thus
enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()
can post enough Receive WRs to receive their replies. This causes an
RNR and the new connection is lost immediately.

The race is most clearly exposed when KASAN and disconnect injection
are enabled. This slows down rpcrdma_rep_create() enough to allow
the send side to post a bunch of RPC Calls before the Receive
completion handler can invoke ib_post_recv().

Fixes: 2ae50ad68c ("xprtrdma: Close window between waking RPC senders and posting Receives")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:24:05 -04:00
Chuck Lever 9e3ca33b62 xprtrdma: Improve locking around rpcrdma_rep creation
Defensive clean up: Protect the rb_all_reps list during rep
creation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:23:40 -04:00
Chuck Lever 8b5292be68 xprtrdma: Improve commentary around rpcrdma_reps_unmap()
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:23:19 -04:00
Chuck Lever eaf86e8cc8 xprtrdma: Improve locking around rpcrdma_rep destruction
Currently rpcrdma_reps_destroy() assumes that, at transport
tear-down, the content of the rb_free_reps list is the same as the
content of the rb_all_reps list. Although that is usually true,
using the rb_all_reps list should be more reliable because of
the way it's managed. And, rpcrdma_reps_unmap() uses rb_all_reps;
these two functions should both traverse the "all" list.

Ensure that all rpcrdma_reps are always destroyed whether they are
on the rep free list or not.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:22:29 -04:00
Chuck Lever 5030c9a938 xprtrdma: Put flushed Receives on free list instead of destroying them
Defer destruction of an rpcrdma_rep until transport tear-down to
preserve the rb_all_reps list while Receives flush.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:21:49 -04:00
Chuck Lever 15788d1d10 xprtrdma: Do not refresh Receive Queue while it is draining
Currently the Receive completion handler refreshes the Receive Queue
whenever a successful Receive completion occurs.

On disconnect, xprtrdma drains the Receive Queue. The first few
Receive completions after a disconnect are typically successful,
until the first flushed Receive.

This means the Receive completion handler continues to post more
Receive WRs after the drain sentinel has been posted. The late-
posted Receives flush after the drain sentinel has completed,
leading to a crash later in rpcrdma_xprt_disconnect().

To prevent this crash, xprtrdma has to ensure that the Receive
handler stops posting Receives before ib_drain_rq() posts its
drain sentinel.

Suggested-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:21:44 -04:00
Chuck Lever 32e6b68167 xprtrdma: Avoid Receive Queue wrapping
Commit e340c2d6ef ("xprtrdma: Reduce the doorbell rate (Receive)")
increased the number of Receive WRs that are posted by the client,
but did not increase the size of the Receive Queue allocated during
transport set-up.

This is usually not an issue because RPCRDMA_BACKWARD_WRS is defined
as (32) when SUNRPC_BACKCHANNEL is defined. In cases where it isn't,
there is a real risk of Receive Queue wrapping.

Fixes: e340c2d6ef ("xprtrdma: Reduce the doorbell rate (Receive)")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:21:36 -04:00
Yunjian Wang b9f83ffaa0 SUNRPC: Fix null pointer dereference in svc_rqst_free()
When alloc_pages_node() returns null in svc_rqst_alloc(), the
null rq_scratch_page pointer will be dereferenced when calling
put_page() in svc_rqst_free(). Fix it by adding a null check.

Addresses-Coverity: ("Dereference after null check")
Fixes: 5191955d6f ("SUNRPC: Prepare for xdr_stream-style decoding on the server-side")
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-23 10:43:05 -04:00
Dan Carpenter cb57908653 SUNRPC: fix ternary sign expansion bug in tracing
This code is supposed to pass negative "err" values for tracing but it
passes positive values instead.  The problem is that the
trace_svcsock_tcp_send() function takes a long but "err" is an int and
"sent" is a u32.  The negative is first type promoted to u32 so it
becomes a high positive then it is promoted to long and it stays
positive.

Fix this by casting "err" directly to long.

Fixes: 998024dee1 ("SUNRPC: Add more svcsock tracepoints")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-22 11:02:28 -04:00
Chuck Lever 8727f78855 svcrdma: Pass a useful error code to the send_err tracepoint
Capture error codes in @ret, which is passed to the send_err
tracepoint, so that they can be logged when something goes awry.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-14 12:09:27 -04:00
Chuck Lever c7731d5e05 svcrdma: Rename goto labels in svc_rdma_sendto()
Clean up: Make the goto labels consistent with other similar
functions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-14 12:09:27 -04:00
Chuck Lever 351461f332 svcrdma: Don't leak send_ctxt on Send errors
Address a rare send_ctxt leak in the svc_rdma_sendto() error paths.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-14 12:09:27 -04:00
Chris Dion 09252177d5 SUNRPC: Handle major timeout in xprt_adjust_timeout()
Currently if a major timeout value is reached, but the minor value has
not been reached, an ETIMEOUT will not be sent back to the caller.
This can occur if the v4 server is not responding to requests and
retrans is configured larger than the default of two.

For example, A TCP mount with a configured timeout value of 50 and a
retransmission count of 3 to a v4 server which is not responding:

1. Initial value and increment set to 5s, maxval set to 20s, retries at 3
2. Major timeout is set to 20s, minor timeout set to 5s initially
3. xport_adjust_timeout() is called after 5s, retry with 10s timeout,
   minor timeout is bumped to 10s
4. And again after another 10s, 15s total time with minor timeout set
   to 15s
5. After 20s total time xport_adjust_timeout is called as major timeout is
   reached, but skipped because the minor timeout is not reached
       - After this time the cpu spins continually calling
       	 xport_adjust_timeout() and returning 0 for 10 seconds.
	 As seen on perf sched:
   	 39243.913182 [0005]  mount.nfs[3794] 4607.938      0.017   9746.863
6. This continues until the 15s minor timeout condition is reached (in
   this case for 10 seconds). After which the ETIMEOUT is processed
   back to the caller, the cpu spinning stops, and normal operations
   continue

Fixes: 7de62bc09f ("SUNRPC dont update timeout value on connection reset")
Signed-off-by: Chris Dion <Christopher.Dion@dell.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-14 09:36:30 -04:00
Chuck Lever 6cf23783f7 SUNRPC: Remove trace_xprt_transmit_queued
This tracepoint can crash when dereferencing snd_task because
when some transports connect, they put a cookie in that field
instead of a pointer to an rpc_task.

BUG: KASAN: use-after-free in trace_event_raw_event_xprt_writelock_event+0x141/0x18e [sunrpc]
Read of size 2 at addr ffff8881a83bd3a0 by task git/331872

CPU: 11 PID: 331872 Comm: git Tainted: G S                5.12.0-rc2-00007-g3ab6e585a7f9 #1453
Hardware name: Supermicro SYS-6028R-T/X10DRi, BIOS 1.1a 10/16/2015
Call Trace:
 dump_stack+0x9c/0xcf
 print_address_description.constprop.0+0x18/0x239
 kasan_report+0x174/0x1b0
 trace_event_raw_event_xprt_writelock_event+0x141/0x18e [sunrpc]
 xprt_prepare_transmit+0x8e/0xc1 [sunrpc]
 call_transmit+0x4d/0xc6 [sunrpc]

Fixes: 9ce07ae5eb ("SUNRPC: Replace dprintk() call site in xprt_prepare_transmit")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-14 09:36:30 -04:00
Chuck Lever e936a5970e SUNRPC: Add tracepoint that fires when an RPC is retransmitted
A separate tracepoint can be left enabled all the time to capture
rare but important retransmission events. So for example:

kworker/u26:3-568   [009]   156.967933: xprt_retransmit:      task:44093@5 xid=0xa25dbc79 nfsv3 WRITE ntrans=2

Or, for example, enable all nfs and nfs4 tracepoints, and set up a
trigger to disable tracing when xprt_retransmit fires to capture
everything that leads up to it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-14 09:36:29 -04:00
Chuck Lever 7638e0bfae SUNRPC: Move fault injection call sites
I've hit some crashes that occur in the xprt_rdma_inject_disconnect
path. It appears that, for some provides, rdma_disconnect() can
take so long that the transport can disconnect and release its
hardware resources while rdma_disconnect() is still running,
resulting in a UAF in the provider.

The transport's fault injection method may depend on the stability
of transport data structures. That means it needs to be invoked
only from contexts that hold the transport write lock.

Fixes: 4a06825839 ("SUNRPC: Transport fault injection")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-14 09:36:29 -04:00
Jiapeng Chong dee9f6ade3 sunrpc: Remove unused function ip_map_lookup
Fix the following clang warnings:

net/sunrpc/svcauth_unix.c:306:30: warning: unused function
'ip_map_lookup' [-Wunused-function].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-04-06 11:24:31 -04:00
Benjamin Coddington 98b5cee373 SUNRPC: Ensure the transport backchannel association
If the server sends CB_ calls on a connection that is not associated
with the backchannel, refuse to process the call and shut down the
connection.  This avoids a NULL dereference crash in
xprt_complete_bc_request().  There's not much more we can do in this
situation unless we want to look into allowing all connections to be
associated with the fore and back channel.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-05 09:04:21 -04:00
Eryu Guan 6b996476f3 sunrpc: honor rpc_task's timeout value in rpcb_create()
Currently rpcbind client is created without setting rpc timeout (thus
using the default value). But if the rpc_task already has a customized
timeout in its tk_client field, it's also ignored.

Let's use the same timeout setting in rpc_task->tk_client->cl_timeout
for rpcbind connection.

Signed-off-by: Eryu Guan <eguan@linux.alibaba.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-05 09:04:21 -04:00
Trond Myklebust d737e5d418 SUNRPC: Set TCP_CORK until the transmit queue is empty
When we have multiple RPC requests queued up, it makes sense to set the
TCP_CORK option while the transmit queue is non-empty.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-05 09:04:20 -04:00
Chuck Lever e3eded5e81 svcrdma: Clean up dto_q critical section in svc_rdma_recvfrom()
This, to me, seems less cluttered and less redundant. I was hoping
it could help reduce lock contention on the dto_q lock by reducing
the size of the critical section, but alas, the only improvement is
readability.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-31 15:58:48 -04:00
Chuck Lever 5533c4f4b9 svcrdma: Remove svc_rdma_recv_ctxt::rc_pages and ::rc_arg
These fields are no longer used.

The size of struct svc_rdma_recv_ctxt is now less than 300 bytes on
x86_64, down from 2440 bytes.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-31 15:57:48 -04:00
Chuck Lever 9af723be86 svcrdma: Remove sc_read_complete_q
Now that svc_rdma_recvfrom() waits for Read completion,
sc_read_complete_q is no longer used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-31 15:57:48 -04:00
Chuck Lever 7d81ee8722 svcrdma: Single-stage RDMA Read
Currently the generic RPC server layer calls svc_rdma_recvfrom()
twice to retrieve an RPC message that uses Read chunks. I'm not
exactly sure why this design was chosen originally.

Instead, let's wait for the Read chunk completion inline in the
first call to svc_rdma_recvfrom().

The goal is to eliminate some page allocator churn.
rdma_read_complete() replaces pages in the second svc_rqst by
calling put_page() repeatedly while the upper layer waits for the
request to be constructed, which adds unnecessary NFS WRITE round-
trip latency.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
2021-03-31 15:57:39 -04:00
Chuck Lever 82011c80b3 SUNRPC: Move svc_xprt_received() call sites
Currently, XPT_BUSY is not cleared until xpo_recvfrom returns.
That effectively blocks the receipt and handling of the next RPC
message until the current one has been taken off the transport.
This strict ordering is a requirement for socket transports.

For our kernel RPC/RDMA transport implementation, however, dequeuing
an ingress message is nothing more than a list_del(). The transport
can safely be marked un-busy as soon as that is done.

To keep the changes simpler, this patch just moves the
svc_xprt_received() call site from svc_handle_xprt() into the
transports, so that the actual optimization can be done in a
subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever 7dcfbd86ad SUNRPC: Export svc_xprt_received()
Prepare svc_xprt_received() to be called from transport code instead
of from generic RPC server code.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever cc93ce9529 svcrdma: Retain the page backing rq_res.head[0].iov_base
svc_rdma_sendto() now waits for the NIC hardware to finish with
the pages backing rq_res. We still have to release the page array
in some cases, but now it's always safe to immediately re-use the
page backing rq_res's head buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever 579900670a svcrdma: Remove unused sc_pages field
Clean up. This significantly reduces the size of struct
svc_rdma_send_ctxt.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever 2a1e4f21d8 svcrdma: Normalize Send page handling
Currently svc_rdma_sendto() migrates xdr_buf pages into a separate
page list and NULLs out a bunch of entries in rq_pages while the
pages are under I/O. The Send completion handler then frees those
pages later.

Instead, let's wait for the Send completion, then handle page
releasing in the nfsd thread. I'd like to avoid the cost of 250+
put_page() calls in the Send completion handler, which is single-
threaded.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever e844d307d4 svcrdma: Add a "deferred close" helper
Refactor a bit of commonly used logic so that every site that wants
a close deferred to an nfsd thread does all the right things
(set_bit(XPT_CLOSE) then enqueue).

Also, once XPT_CLOSE is set on a transport, it is never cleared. If
XPT_CLOSE is already set, then the close is already being handled
and the enqueue can be skipped.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever c558d47596 svcrdma: Maintain a Receive water mark
Post more Receives when the number of pending Receives drops below
a water mark. The batch mechanism is disabled if the underlying
device cannot support a reasonably-sized Receive Queue.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever 7b748c30cc svcrdma: Use svc_rdma_refresh_recvs() in wc_receive
Replace svc_rdma_post_recv() with the new batch receive mechanism.
For the moment it is posting just a single Receive WR at a time,
so no change in behavior is expected.

Since svc_rdma_wc_receive() was the last call site for
svc_rdma_post_recv(), it is removed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever 77f0a2aa5c svcrdma: Add a batch Receive posting mechanism
Introduce a server-side mechanism similar to commit e340c2d6ef
("xprtrdma: Reduce the doorbell rate (Receive)") to post Receive
WRs in batch. Its first consumer is svc_rdma_post_recvs(), which
posts the initial set of Receive WRs.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 13:22:13 -04:00
Chuck Lever c6b7ed8f94 svcrdma: Remove stale comment for svc_rdma_wc_receive()
xprt pinning was removed in commit 365e9992b9 ("svcrdma: Remove
transport reference counting"), but this comment was not updated
to reflect that change.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 10:19:05 -04:00
Chuck Lever 270f25edcc svcrdma: Provide an explanatory comment in CMA event handler
Clean up: explain why svc_xprt_enqueue() is invoked in the event
handler even though no xpt_flags bits are toggled here.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 10:19:05 -04:00
Chuck Lever 072db263e1 svcrdma: RPCDBG_FACILITY is no longer used
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-22 10:19:05 -04:00
Linus Torvalds 4108e10197 Miscellaneous NFSD fixes for v5.12-rc.
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Merge tag 'nfsd-5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:
 "Miscellaneous NFSD fixes for v5.12-rc"

* tag 'nfsd-5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  svcrdma: Revert "svcrdma: Reduce Receive doorbell rate"
  NFSD: fix error handling in NFSv4.0 callbacks
  NFSD: fix dest to src mount in inter-server COPY
  Revert "nfsd4: a client's own opens needn't prevent delegations"
  Revert "nfsd4: remove check_conflicting_opens warning"
  rpc: fix NULL dereference on kmalloc failure
  sunrpc: fix refcount leak for rpc auth modules
  NFSD: Repair misuse of sv_lock in 5.10.16-rt30.
  nfsd: don't abort copies early
  fs: nfsd: fix kconfig dependency warning for NFSD_V4
  svcrdma: disable timeouts on rdma backchannel
  nfsd: Don't keep looking up unhashed files in the nfsd file cache
2021-03-16 10:22:50 -07:00
Chuck Lever bade4be69a svcrdma: Revert "svcrdma: Reduce Receive doorbell rate"
I tested commit 43042b90ca ("svcrdma: Reduce Receive doorbell
rate") with mlx4 (IB) and software iWARP and didn't find any
issues. However, I recently got my hardware iWARP setup back on
line (FastLinQ) and it's crashing hard on this commit (confirmed
via bisect).

The failure mode is complex.
 - After a connection is established, the first Receive completes
   normally.
 - But the second and third Receives have garbage in their Receive
   buffers. The server responds with ERR_VERS as a result.
 - When the client tears down the connection to retry, a couple
   of posted Receives flush twice, and that corrupts the recv_ctxt
   free list.
 - __svc_rdma_free then faults or loops infinitely while destroying
   the xprt's recv_ctxts.

Since 43042b90ca ("svcrdma: Reduce Receive doorbell rate") does
not fix a bug but is a scalability enhancement, it's safe and
appropriate to revert it while working on a replacement.

Fixes: 43042b90ca ("svcrdma: Reduce Receive doorbell rate")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-11 15:26:07 -05:00
Benjamin Coddington f0940f4b32 SUNRPC: Set memalloc_nofs_save() for sync tasks
We could recurse into NFS doing memory reclaim while sending a sync task,
which might result in a deadlock.  Set memalloc_nofs_save for sync task
execution.

Fixes: a1231fda7e ("SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-03-08 15:32:16 -05:00
J. Bruce Fields 0ddc942394 rpc: fix NULL dereference on kmalloc failure
I think this is unlikely but possible:

svc_authenticate sets rq_authop and calls svcauth_gss_accept.  The
kmalloc(sizeof(*svcdata), GFP_KERNEL) fails, leaving rq_auth_data NULL,
and returning SVC_DENIED.

This causes svc_process_common to go to err_bad_auth, and eventually
call svc_authorise.  That calls ->release == svcauth_gss_release, which
tries to dereference rq_auth_data.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Link: https://lore.kernel.org/linux-nfs/3F1B347F-B809-478F-A1E9-0BE98E22B0F0@oracle.com/T/#t
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-06 16:41:49 -05:00
Daniel Kobras f1442d6349 sunrpc: fix refcount leak for rpc auth modules
If an auth module's accept op returns SVC_CLOSE, svc_process_common()
enters a call path that does not call svc_authorise() before leaving the
function, and thus leaks a reference on the auth module's refcount. Hence,
make sure calls to svc_authenticate() and svc_authorise() are paired for
all call paths, to make sure rpc auth modules can be unloaded.

Signed-off-by: Daniel Kobras <kobras@puzzle-itc.de>
Fixes: 4d712ef1db ("svcauth_gss: Close connection when dropping an incoming message")
Link: https://lore.kernel.org/linux-nfs/3F1B347F-B809-478F-A1E9-0BE98E22B0F0@oracle.com/T/#t
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-06 16:41:49 -05:00
Joe Korty c7de87ff9d NFSD: Repair misuse of sv_lock in 5.10.16-rt30.
[ This problem is in mainline, but only rt has the chops to be
able to detect it. ]

Lockdep reports a circular lock dependency between serv->sv_lock and
softirq_ctl.lock on system shutdown, when using a kernel built with
CONFIG_PREEMPT_RT=y, and a nfs mount exists.

This is due to the definition of spin_lock_bh on rt:

	local_bh_disable();
	rt_spin_lock(lock);

which forces a softirq_ctl.lock -> serv->sv_lock dependency.  This is
not a problem as long as _every_ lock of serv->sv_lock is a:

	spin_lock_bh(&serv->sv_lock);

but there is one of the form:

	spin_lock(&serv->sv_lock);

This is what is causing the circular dependency splat.  The spin_lock()
grabs the lock without first grabbing softirq_ctl.lock via local_bh_disable.
If later on in the critical region,  someone does a local_bh_disable, we
get a serv->sv_lock -> softirq_ctrl.lock dependency established.  Deadlock.

Fix is to make serv->sv_lock be locked with spin_lock_bh everywhere, no
exceptions.

[  OK  ] Stopped target NFS client services.
         Stopping Logout off all iSCSI sessions on shutdown...
         Stopping NFS server and services...
[  109.442380]
[  109.442385] ======================================================
[  109.442386] WARNING: possible circular locking dependency detected
[  109.442387] 5.10.16-rt30 #1 Not tainted
[  109.442389] ------------------------------------------------------
[  109.442390] nfsd/1032 is trying to acquire lock:
[  109.442392] ffff994237617f60 ((softirq_ctrl.lock).lock){+.+.}-{2:2}, at: __local_bh_disable_ip+0xd9/0x270
[  109.442405]
[  109.442405] but task is already holding lock:
[  109.442406] ffff994245cb00b0 (&serv->sv_lock){+.+.}-{0:0}, at: svc_close_list+0x1f/0x90
[  109.442415]
[  109.442415] which lock already depends on the new lock.
[  109.442415]
[  109.442416]
[  109.442416] the existing dependency chain (in reverse order) is:
[  109.442417]
[  109.442417] -> #1 (&serv->sv_lock){+.+.}-{0:0}:
[  109.442421]        rt_spin_lock+0x2b/0xc0
[  109.442428]        svc_add_new_perm_xprt+0x42/0xa0
[  109.442430]        svc_addsock+0x135/0x220
[  109.442434]        write_ports+0x4b3/0x620
[  109.442438]        nfsctl_transaction_write+0x45/0x80
[  109.442440]        vfs_write+0xff/0x420
[  109.442444]        ksys_write+0x4f/0xc0
[  109.442446]        do_syscall_64+0x33/0x40
[  109.442450]        entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  109.442454]
[  109.442454] -> #0 ((softirq_ctrl.lock).lock){+.+.}-{2:2}:
[  109.442457]        __lock_acquire+0x1264/0x20b0
[  109.442463]        lock_acquire+0xc2/0x400
[  109.442466]        rt_spin_lock+0x2b/0xc0
[  109.442469]        __local_bh_disable_ip+0xd9/0x270
[  109.442471]        svc_xprt_do_enqueue+0xc0/0x4d0
[  109.442474]        svc_close_list+0x60/0x90
[  109.442476]        svc_close_net+0x49/0x1a0
[  109.442478]        svc_shutdown_net+0x12/0x40
[  109.442480]        nfsd_destroy+0xc5/0x180
[  109.442482]        nfsd+0x1bc/0x270
[  109.442483]        kthread+0x194/0x1b0
[  109.442487]        ret_from_fork+0x22/0x30
[  109.442492]
[  109.442492] other info that might help us debug this:
[  109.442492]
[  109.442493]  Possible unsafe locking scenario:
[  109.442493]
[  109.442493]        CPU0                    CPU1
[  109.442494]        ----                    ----
[  109.442495]   lock(&serv->sv_lock);
[  109.442496]                                lock((softirq_ctrl.lock).lock);
[  109.442498]                                lock(&serv->sv_lock);
[  109.442499]   lock((softirq_ctrl.lock).lock);
[  109.442501]
[  109.442501]  *** DEADLOCK ***
[  109.442501]
[  109.442501] 3 locks held by nfsd/1032:
[  109.442503]  #0: ffffffff93b49258 (nfsd_mutex){+.+.}-{3:3}, at: nfsd+0x19a/0x270
[  109.442508]  #1: ffff994245cb00b0 (&serv->sv_lock){+.+.}-{0:0}, at: svc_close_list+0x1f/0x90
[  109.442512]  #2: ffffffff93a81b20 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0x5/0xc0
[  109.442518]
[  109.442518] stack backtrace:
[  109.442519] CPU: 0 PID: 1032 Comm: nfsd Not tainted 5.10.16-rt30 #1
[  109.442522] Hardware name: Supermicro X9DRL-3F/iF/X9DRL-3F/iF, BIOS 3.2 09/22/2015
[  109.442524] Call Trace:
[  109.442527]  dump_stack+0x77/0x97
[  109.442533]  check_noncircular+0xdc/0xf0
[  109.442546]  __lock_acquire+0x1264/0x20b0
[  109.442553]  lock_acquire+0xc2/0x400
[  109.442564]  rt_spin_lock+0x2b/0xc0
[  109.442570]  __local_bh_disable_ip+0xd9/0x270
[  109.442573]  svc_xprt_do_enqueue+0xc0/0x4d0
[  109.442577]  svc_close_list+0x60/0x90
[  109.442581]  svc_close_net+0x49/0x1a0
[  109.442585]  svc_shutdown_net+0x12/0x40
[  109.442588]  nfsd_destroy+0xc5/0x180
[  109.442590]  nfsd+0x1bc/0x270
[  109.442595]  kthread+0x194/0x1b0
[  109.442600]  ret_from_fork+0x22/0x30
[  109.518225] nfsd: last server has exited, flushing export cache
[  OK  ] Stopped NFSv4 ID-name mapping service.
[  OK  ] Stopped GSSAPI Proxy Daemon.
[  OK  ] Stopped NFS Mount Daemon.
[  OK  ] Stopped NFS status monitor for NFSv2/3 locking..

Fixes: 719f8bcc88 ("svcrpc: fix xpt_list traversal locking on shutdown")
Signed-off-by: Joe Korty <joe.korty@concurrent-rt.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-06 16:41:48 -05:00
Timo Rothenpieler 6820bf7786 svcrdma: disable timeouts on rdma backchannel
This brings it in line with the regular tcp backchannel, which also has
all those timeouts disabled.

Prevents the backchannel from timing out, getting some async operations
like server side copying getting stuck indefinitely on the client side.

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
Fixes: 5d252f90a8 ("svcrdma: Add class for RDMA backwards direction transport")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-03-06 16:41:48 -05:00
Linus Torvalds 1c9077cdec NFS Client Updates for Linux 5.12
- New Features:
   - Support for eager writes, and the write=eager and write=wait mount options
 
 - Other Bugfixes and Cleanups:
   - Fix typos in some comments
   - Fix up fall-through warnings for Clang
   - Cleanups to the NFS readpage codepath
   - Remove FMR support in rpcrdma_convert_iovs()
   - Various other cleanups to xprtrdma
   - Fix xprtrdma pad optimization for servers that don't support RFC 8797
   - Improvements to rpcrdma tracepoints
   - Fix up nfs4_bitmask_adjust()
   - Optimize sparse writes past the end of files
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Merge tag 'nfs-for-5.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS Client Updates from Anna Schumaker:
 "New Features:
   - Support for eager writes, and the write=eager and write=wait mount
     options

- Other Bugfixes and Cleanups:
   - Fix typos in some comments
   - Fix up fall-through warnings for Clang
   - Cleanups to the NFS readpage codepath
   - Remove FMR support in rpcrdma_convert_iovs()
   - Various other cleanups to xprtrdma
   - Fix xprtrdma pad optimization for servers that don't support
     RFC 8797
   - Improvements to rpcrdma tracepoints
   - Fix up nfs4_bitmask_adjust()
   - Optimize sparse writes past the end of files"

* tag 'nfs-for-5.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (27 commits)
  NFS: Support the '-owrite=' option in /proc/self/mounts and mountinfo
  NFS: Set the stable writes flag when initialising the super block
  NFS: Add mount options supporting eager writes
  NFS: Add support for eager writes
  NFS: 'flags' field should be unsigned in struct nfs_server
  NFS: Don't set NFS_INO_INVALID_XATTR if there is no xattr cache
  NFS: Always clear an invalid mapping when attempting a buffered write
  NFS: Optimise sparse writes past the end of file
  NFS: Fix documenting comment for nfs_revalidate_file_size()
  NFSv4: Fixes for nfs4_bitmask_adjust()
  xprtrdma: Clean up rpcrdma_prepare_readch()
  rpcrdma: Capture bytes received in Receive completion tracepoints
  xprtrdma: Pad optimization, revisited
  rpcrdma: Fix comments about reverse-direction operation
  xprtrdma: Refactor invocations of offset_in_page()
  xprtrdma: Simplify rpcrdma_convert_kvec() and frwr_map()
  xprtrdma: Remove FMR support in rpcrdma_convert_iovs()
  NFS: Add nfs_pageio_complete_read() and remove nfs_readpage_async()
  NFS: Call readpage_async_filler() from nfs_readpage_async()
  NFS: Refactor nfs_readpage() and nfs_readpage_async() to use nfs_readdesc
  ...
2021-02-26 09:17:24 -08:00
Linus Torvalds 7c70f3a748 Optimization:
- Cork the socket while there are queued replies
 
 Fixes:
 
 - DRC shutdown ordering
 - svc_rdma_accept() lockdep splat
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Merge tag 'nfsd-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull more nfsd updates from Chuck Lever:
 "Here are a few additional NFSD commits for the merge window:

 Optimization:
   - Cork the socket while there are queued replies

  Fixes:
   - DRC shutdown ordering
   - svc_rdma_accept() lockdep splat"

* tag 'nfsd-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: Further clean up svc_tcp_sendmsg()
  SUNRPC: Remove redundant socket flags from svc_tcp_sendmsg()
  SUNRPC: Use TCP_CORK to optimise send performance on the server
  svcrdma: Hold private mutex while invoking rdma_accept()
  nfsd: register pernet ops last, unregister first
2021-02-22 13:29:55 -08:00
Linus Torvalds 99f1a5872b Highlights:
- Update NFSv2 and NFSv3 XDR decoding functions
 - Further improve support for re-exporting NFS mounts
 - Convert NFSD stats to per-CPU counters
 - Add batch Receive posting to the server's RPC/RDMA transport
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Merge tag 'nfsd-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd updates from Chuck Lever:

 - Update NFSv2 and NFSv3 XDR decoding functions

 - Further improve support for re-exporting NFS mounts

 - Convert NFSD stats to per-CPU counters

 - Add batch Receive posting to the server's RPC/RDMA transport

* tag 'nfsd-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (65 commits)
  nfsd: skip some unnecessary stats in the v4 case
  nfs: use change attribute for NFS re-exports
  NFSv4_2: SSC helper should use its own config.
  nfsd: cstate->session->se_client -> cstate->clp
  nfsd: simplify nfsd4_check_open_reclaim
  nfsd: remove unused set_client argument
  nfsd: find_cpntf_state cleanup
  nfsd: refactor set_client
  nfsd: rename lookup_clientid->set_client
  nfsd: simplify nfsd_renew
  nfsd: simplify process_lock
  nfsd4: simplify process_lookup1
  SUNRPC: Correct a comment
  svcrdma: DMA-sync the receive buffer in svc_rdma_recvfrom()
  svcrdma: Reduce Receive doorbell rate
  svcrdma: Deprecate stat variables that are no longer used
  svcrdma: Restore read and write stats
  svcrdma: Convert rdma_stat_sq_starve to a per-CPU counter
  svcrdma: Convert rdma_stat_recv to a per-CPU counter
  svcrdma: Refactor svc_rdma_init() and svc_rdma_clean_up()
  ...
2021-02-21 10:22:20 -08:00
Chuck Lever 4d12b72753 SUNRPC: Further clean up svc_tcp_sendmsg()
Clean up: The msghdr is no longer needed in the caller.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-02-16 12:38:12 -05:00
Trond Myklebust 987c7b1d09 SUNRPC: Remove redundant socket flags from svc_tcp_sendmsg()
Now that the caller controls the TCP_CORK socket option, it is redundant
to set MSG_MORE and MSG_SENDPAGE_NOTLAST in the calls to
kernel_sendpage().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-02-16 12:33:04 -05:00
Trond Myklebust e0a912e8dd SUNRPC: Use TCP_CORK to optimise send performance on the server
Use a counter to keep track of how many requests are queued behind the
xprt->xpt_mutex, and keep TCP_CORK set until the queue is empty.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Link: https://lore.kernel.org/linux-nfs/20210213202532.23146-1-trondmy@kernel.org/T/#u
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-02-16 12:32:31 -05:00
Chuck Lever 0ac24c320c svcrdma: Hold private mutex while invoking rdma_accept()
RDMA core mutex locking was restructured by commit d114c6feed
("RDMA/cma: Add missing locking to rdma_accept()") [Aug 2020]. When
lock debugging is enabled, the RPC/RDMA server trips over the new
lockdep assertion in rdma_accept() because it doesn't call
rdma_accept() from its CM event handler.

As a temporary fix, have svc_rdma_accept() take the handler_mutex
explicitly. In the meantime, let's consider how to restructure the
RPC/RDMA transport to invoke rdma_accept() from the proper context.

Calls to svc_rdma_accept() are serialized with calls to
svc_rdma_free() by the generic RPC server layer.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/linux-rdma/20210209154014.GO4247@nvidia.com/
Fixes: d114c6feed ("RDMA/cma: Add missing locking to rdma_accept()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-02-15 10:45:00 -05:00
Chuck Lever 586a0787ce xprtrdma: Clean up rpcrdma_prepare_readch()
Since commit 9ed5af268e ("SUNRPC: Clean up the handling of page
padding in rpc_prepare_reply_pages()") [Dec 2020] the NFS client
passes payload data to the transport with the padding in xdr->pages
instead of in the send buffer's tail kvec. There's no need for the
extra logic to advance the base of the tail kvec because the upper
layer no longer places XDR padding there.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 15:54:03 -05:00
Chuck Lever 2324fbedc2 xprtrdma: Pad optimization, revisited
The NetApp Linux team discovered that with NFS/RDMA servers that do
not support RFC 8797, the Linux client is forming NFSv4.x WRITE
requests incorrectly.

In this case, the Linux NFS client disables implicit chunk round-up
for odd-length Read and Write chunks. The goal was to support old
servers that needed that padding to be sent explicitly by clients.

In that case the Linux NFS included the tail kvec in the Read chunk,
since the tail contains any needed padding. That meant a separate
memory registration is needed for the tail kvec, adding to the cost
of forming such requests. To avoid that cost for a mere 3 bytes of
zeroes that are always ignored by receivers, we try to use implicit
roundup when possible.

For NFSv4.x, the tail kvec also sometimes contains a trailing
GETATTR operation. The Linux NFS client unintentionally includes
that GETATTR operation in the Read chunk as well as inline.

The fix is simply to /never/ include the tail kvec when forming a
data payload Read chunk. The padding is thus now always present.

Note that since commit 9ed5af268e ("SUNRPC: Clean up the handling
of page padding in rpc_prepare_reply_pages()") [Dec 2020] the NFS
client passes payload data to the transport with the padding in
xdr->pages instead of in the send buffer's tail kvec. So now the
Linux NFS client appends XDR padding to all odd-sized Read chunks.
This shouldn't be a problem because:

 - RFC 8166-compliant servers are supposed to work with or without
   that XDR padding in Read chunks.

 - Since the padding is now in the same memory region as the data
   payload, a separate memory registration is not needed. In
   addition, the link layer extends data in RDMA Read responses to
   4-byte boundaries anyway. Thus there is now no savings when the
   padding is not included.

Because older kernels include the payload's XDR padding in the
tail kvec, a fix there will be more complicated. Thus backporting
this patch is not recommended.

Reported by: Olga Kornievskaia <Olga.Kornievskaia@netapp.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 11:16:56 -05:00
Chuck Lever 84dff5eb86 rpcrdma: Fix comments about reverse-direction operation
During the final stages of publication of RFC 8167, reviewers
requested that we use the term "reverse direction" rather than
"backwards direction". Update comments to reflect this preference.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 11:16:56 -05:00
Chuck Lever 67b16625d1 xprtrdma: Refactor invocations of offset_in_page()
Clean up so that offset_in_page() is invoked less often in the
most common case, which is mapping xdr->pages.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 11:16:56 -05:00
Chuck Lever 54e6aec57c xprtrdma: Simplify rpcrdma_convert_kvec() and frwr_map()
Clean up.

Remove a conditional branch from the SGL set-up loop in frwr_map():
Instead of using either sg_set_page() or sg_set_buf(), initialize
the mr_page field properly when rpcrdma_convert_kvec() converts the
kvec to an SGL entry. frwr_map() can then invoke sg_set_page()
unconditionally.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 11:16:55 -05:00
Chuck Lever 9929f4adce xprtrdma: Remove FMR support in rpcrdma_convert_iovs()
Support for FMR was removed by commit ba69cd122e ("xprtrdma:
Remove support for FMR memory registration") [Dec 2018]. That means
the buffer-splitting behavior of rpcrdma_convert_kvec(), added by
commit 821c791a0b ("xprtrdma: Segment head and tail XDR buffers
on page boundaries") [Mar 2016], is no longer necessary. FRWR
memory registration handles this case with aplomb.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-05 11:16:55 -05:00
Gustavo A. R. Silva 93f479d3ad SUNRPC: Fix fall-through warnings for Clang
In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead of
letting the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-01 13:32:32 -05:00
Bhaskar Chowdhury 12b20ce349 net: sunrpc: xprtsock.c: Corrected few spellings ,in comments
Few trivial and rudimentary spell corrections.

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-01 10:32:28 -05:00
Calum Mackay 8c71139d9f SUNRPC: correct error code comment in xs_tcp_setup_socket()
This comment was introduced by commit 6ea44adce9
("SUNRPC: ensure correct error is reported by xs_tcp_setup_socket()").

I believe EIO was a typo at the time: it should have been EAGAIN.

Subsequently, commit 0445f92c5d ("SUNRPC: Fix disconnection races")
changed that to ENOTCONN.

Rather than trying to keep the comment here in sync with the code in
xprt_force_disconnect(), make the point in a non-specific way.

Fixes: 6ea44adce9 ("SUNRPC: ensure correct error is reported by xs_tcp_setup_socket()")
Signed-off-by: Calum Mackay <calum.mackay@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-01 10:32:28 -05:00
Chuck Lever bad4c6eb5e SUNRPC: Fix NFS READs that start at non-page-aligned offsets
Anj Duvnjak reports that the Kodi.tv NFS client is not able to read
video files from a v5.10.11 Linux NFS server.

The new sendpage-based TCP sendto logic was not attentive to non-
zero page_base values. nfsd_splice_read() sets that field when a
READ payload starts in the middle of a page.

The Linux NFS client rarely emits an NFS READ that is not page-
aligned. All of my testing so far has been with Linux clients, so I
missed this one.

Reported-by: A. Duvnjak <avian@extremenerds.net>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211471
Fixes: 4a85a6a332 ("SUNRPC: Handle TCP socket sends with kernel_sendpage() again")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: A. Duvnjak <avian@extremenerds.net>
2021-02-01 10:03:51 -05:00
Dave Wysochanski e4a7d1f770 SUNRPC: Handle 0 length opaque XDR object data properly
When handling an auth_gss downcall, it's possible to get 0-length
opaque object for the acceptor.  In the case of a 0-length XDR
object, make sure simple_get_netobj() fills in dest->data = NULL,
and does not continue to kmemdup() which will set
dest->data = ZERO_SIZE_PTR for the acceptor.

The trace event code can handle NULL but not ZERO_SIZE_PTR for a
string, and so without this patch the rpcgss_context trace event
will crash the kernel as follows:

[  162.887992] BUG: kernel NULL pointer dereference, address: 0000000000000010
[  162.898693] #PF: supervisor read access in kernel mode
[  162.900830] #PF: error_code(0x0000) - not-present page
[  162.902940] PGD 0 P4D 0
[  162.904027] Oops: 0000 [#1] SMP PTI
[  162.905493] CPU: 4 PID: 4321 Comm: rpc.gssd Kdump: loaded Not tainted 5.10.0 #133
[  162.908548] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[  162.910978] RIP: 0010:strlen+0x0/0x20
[  162.912505] Code: 48 89 f9 74 09 48 83 c1 01 80 39 00 75 f7 31 d2 44 0f b6 04 16 44 88 04 11 48 83 c2 01 45 84 c0 75 ee c3 0f 1f 80 00 00 00 00 <80> 3f 00 74 10 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 c3 31
[  162.920101] RSP: 0018:ffffaec900c77d90 EFLAGS: 00010202
[  162.922263] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000fffde697
[  162.925158] RDX: 000000000000002f RSI: 0000000000000080 RDI: 0000000000000010
[  162.928073] RBP: 0000000000000010 R08: 0000000000000e10 R09: 0000000000000000
[  162.930976] R10: ffff8e698a590cb8 R11: 0000000000000001 R12: 0000000000000e10
[  162.933883] R13: 00000000fffde697 R14: 000000010034d517 R15: 0000000000070028
[  162.936777] FS:  00007f1e1eb93700(0000) GS:ffff8e6ab7d00000(0000) knlGS:0000000000000000
[  162.940067] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  162.942417] CR2: 0000000000000010 CR3: 0000000104eba000 CR4: 00000000000406e0
[  162.945300] Call Trace:
[  162.946428]  trace_event_raw_event_rpcgss_context+0x84/0x140 [auth_rpcgss]
[  162.949308]  ? __kmalloc_track_caller+0x35/0x5a0
[  162.951224]  ? gss_pipe_downcall+0x3a3/0x6a0 [auth_rpcgss]
[  162.953484]  gss_pipe_downcall+0x585/0x6a0 [auth_rpcgss]
[  162.955953]  rpc_pipe_write+0x58/0x70 [sunrpc]
[  162.957849]  vfs_write+0xcb/0x2c0
[  162.959264]  ksys_write+0x68/0xe0
[  162.960706]  do_syscall_64+0x33/0x40
[  162.962238]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  162.964346] RIP: 0033:0x7f1e1f1e57df

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-01-25 15:59:12 -05:00
Dave Wysochanski ba6dfce47c SUNRPC: Move simple_get_bytes and simple_get_netobj into private header
Remove duplicated helper functions to parse opaque XDR objects
and place inside new file net/sunrpc/auth_gss/auth_gss_internal.h.
In the new file carry the license and copyright from the source file
net/sunrpc/auth_gss/auth_gss.c.  Finally, update the comment inside
include/linux/sunrpc/xdr.h since lockd is not the only user of
struct xdr_netobj.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-01-25 15:59:12 -05:00
Chuck Lever 4ff923ce1e SUNRPC: Correct a comment
Clean up: The rq_argpages field was removed from struct svc_rqst in
the pre-git era.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever dd2d055b27 svcrdma: DMA-sync the receive buffer in svc_rdma_recvfrom()
The Receive completion handler doesn't look at the contents of the
Receive buffer. The DMA sync isn't terribly expensive but it's one
less thing that needs to be done by the Receive completion handler,
which is single-threaded (per svc_xprt). This helps scalability.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2021-01-25 09:36:28 -05:00
Chuck Lever 43042b90ca svcrdma: Reduce Receive doorbell rate
This is similar to commit e340c2d6ef ("xprtrdma: Reduce the
doorbell rate (Receive)") which added Receive batching to the
client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever c6226ff9a6 svcrdma: Deprecate stat variables that are no longer used
Clean up. We are not permitted to remove old proc files. Instead,
convert these variables to stubs that are only ever allowed to
display a value of zero.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever 1e7e557316 svcrdma: Restore read and write stats
Now that we have an efficient mechanism to update these two stats,
let's start maintaining them again.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever 22df5a2246 svcrdma: Convert rdma_stat_sq_starve to a per-CPU counter
Avoid the overhead of a memory bus lock cycle for counting a value
that is hardly every used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever df971cd853 svcrdma: Convert rdma_stat_recv to a per-CPU counter
Receives are frequent events. Avoid the overhead of a memory bus
lock cycle for counting a value that is hardly every used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Chuck Lever 59a00257c6 svcrdma: Refactor svc_rdma_init() and svc_rdma_clean_up()
Setting up the proc variables is about to get more complicated.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-25 09:36:28 -05:00
Linus Torvalds f419f031de Fixes:
- Avoid exposing parent of root directory in NFSv3 READDIRPLUS results
 - Fix a tracepoint change that went in the initial 5.11 merge
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Merge tag 'nfsd-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Avoid exposing parent of root directory in NFSv3 READDIRPLUS results

 - Fix a tracepoint change that went in the initial 5.11 merge

* tag 'nfsd-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: Move the svc_xdr_recvfrom tracepoint again
  nfsd4: readdirplus shouldn't return parent of export
2021-01-19 13:01:50 -08:00
Chuck Lever 5f39d2713b SUNRPC: Move the svc_xdr_recvfrom tracepoint again
Commit 156708adf2 ("SUNRPC: Move the svc_xdr_recvfrom()
tracepoint") tried to capture the correct XID in the trace record,
but this line in svc_recv:

	rqstp->rq_xid = svc_getu32(&rqstp->rq_arg.head[0]);

alters the size of rq_arg.head[0].iov_len. The tracepoint records
the correct XID but an incorrect value for the length of the
xdr_buf's head.

To keep the trace callsites simple, I've created two trace classes.
One assumes the xdr_buf contains a full RPC message, and the XID
can be extracted from it. The other assumes the contents of the
xdr_buf are arbitrary, and the xid will be provided by the caller.

Currently there is only one user of each class, but I expect we will
need a few more tracepoints using each class as time goes on.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-01-13 09:13:20 -05:00
Linus Torvalds e609571b5f NFS client bugfixes for Linux 5.11
Highlights include:
 
 Bugfixes:
 - Fix parsing of link-local IPv6 addresses
 - Fix confusing logging of mount errors that was introduced by the
   fsopen() patchset.
 - Fix a tracing use after free in _nfs4_do_setlk()
 - Layout return-on-close fixes when called from nfs4_evict_inode()
 - Layout segments were being leaked in pnfs_generic_clear_request_commit()
 - Don't leak DS commits in pnfs_generic_retry_commit()
 - Fix an Oopsable use-after-free when nfs_delegation_find_inode_server()
   calls iput() on an inode after the super block has gone away.
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Merge tag 'nfs-for-5.11-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client fixes from Trond Myklebust:
 "Highlights include:

   - Fix parsing of link-local IPv6 addresses

   - Fix confusing logging of mount errors that was introduced by the
     fsopen() patchset.

   - Fix a tracing use after free in _nfs4_do_setlk()

   - Layout return-on-close fixes when called from nfs4_evict_inode()

   - Layout segments were being leaked in
     pnfs_generic_clear_request_commit()

   - Don't leak DS commits in pnfs_generic_retry_commit()

   - Fix an Oopsable use-after-free when nfs_delegation_find_inode_server()
     calls iput() on an inode after the super block has gone away"

* tag 'nfs-for-5.11-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: nfs_igrab_and_active must first reference the superblock
  NFS: nfs_delegation_find_inode_server must first reference the superblock
  NFS/pNFS: Fix a leak of the layout 'plh_outstanding' counter
  NFS/pNFS: Don't leak DS commits in pnfs_generic_retry_commit()
  NFS/pNFS: Don't call pnfs_free_bucket_lseg() before removing the request
  pNFS: Stricter ordering of layoutget and layoutreturn
  pNFS: Clean up pnfs_layoutreturn_free_lsegs()
  pNFS: We want return-on-close to complete when evicting the inode
  pNFS: Mark layout for return if return-on-close was not sent
  net: sunrpc: interpret the return value of kstrtou32 correctly
  NFS: Adjust fs_context error logging
  NFS4: Fix use-after-free in trace_event_raw_event_nfs4_set_lock
2021-01-12 09:38:53 -08:00
Linus Torvalds c912fd05fa Fixes:
- Fix major TCP performance regression
 - Get NFSv4.2 READ_PLUS regression tests to pass
 - Improve NFSv4 COMPOUND memory allocation
 - Fix sparse warning
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Merge tag 'nfsd-5.11-1' of git://git.linux-nfs.org/projects/cel/cel-2.6

Pull nfsd fixes from Chuck Lever:

 - Fix major TCP performance regression

 - Get NFSv4.2 READ_PLUS regression tests to pass

 - Improve NFSv4 COMPOUND memory allocation

 - Fix sparse warning

* tag 'nfsd-5.11-1' of git://git.linux-nfs.org/projects/cel/cel-2.6:
  NFSD: Restore NFSv4 decoding's SAVEMEM functionality
  SUNRPC: Handle TCP socket sends with kernel_sendpage() again
  NFSD: Fix sparse warning in nfssvc.c
  nfsd: Don't set eof on a truncated READ_PLUS
  nfsd: Fixes for nfsd4_encode_read_plus_data()
2021-01-11 11:35:46 -08:00
j.nixdorf@avm.de 86b53fbf08 net: sunrpc: interpret the return value of kstrtou32 correctly
A return value of 0 means success. This is documented in lib/kstrtox.c.

This was found by trying to mount an NFS share from a link-local IPv6
address with the interface specified by its index:

  mount("[fe80::1%1]:/srv/nfs", "/mnt", "nfs", 0, "nolock,addr=fe80::1%1")

Before this commit this failed with EINVAL and also caused the following
message in dmesg:

  [...] NFS: bad IP address specified: addr=fe80::1%1

The syscall using the same address based on the interface name instead
of its index succeeds.

Credits for this patch go to my colleague Christian Speich, who traced
the origin of this bug to this line of code.

Signed-off-by: Johannes Nixdorf <j.nixdorf@avm.de>
Fixes: 00cfaa943e ("replace strict_strto calls")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-01-10 13:32:51 -05:00
Chuck Lever 4a85a6a332 SUNRPC: Handle TCP socket sends with kernel_sendpage() again
Daire Byrne reports a ~50% aggregrate throughput regression on his
Linux NFS server after commit da1661b93b ("SUNRPC: Teach server to
use xprt_sock_sendmsg for socket sends"), which replaced
kernel_send_page() calls in NFSD's socket send path with calls to
sock_sendmsg() using iov_iter.

Investigation showed that tcp_sendmsg() was not using zero-copy to
send the xdr_buf's bvec pages, but instead was relying on memcpy.
This means copying every byte of a large NFS READ payload.

It looks like TLS sockets do indeed support a ->sendpage method,
so it's really not necessary to use xprt_sock_sendmsg() to support
TLS fully on the server. A mechanical reversion of da1661b93b is
not possible at this point, but we can re-implement the server's
TCP socket sendmsg path using kernel_sendpage().

Reported-by: Daire Byrne <daire@dneg.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=209439
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-12-18 12:28:41 -05:00
Linus Torvalds 74f602dc96 NFS client updates for Linux 5.11
Highlights include:
 
 Features:
 - NFSv3: Add emulation of lookupp() to improve open_by_filehandle()
   support.
 - A series of patches to improve readdir performance, particularly with
   large directories.
 - Basic support for using NFS/RDMA with the pNFS files and flexfiles
   drivers.
 - Micro-optimisations for RDMA.
 - RDMA tracing improvements.
 
 Bugfixes:
 - Fix a long standing bug with xs_read_xdr_buf() when receiving partial
   pages (Dan Aloni).
 - Various fixes for getxattr and listxattr, when used over non-TCP
   transports.
 - Fixes for containerised NFS from Sargun Dhillon.
 - switch nfsiod to be an UNBOUND workqueue (Neil Brown).
 - READDIR should not ask for security label information if there is no
   LSM policy. (Olga Kornievskaia)
 - Avoid using interval-based rebinding with TCP in lockd (Calum Mackay).
 - A series of RPC and NFS layer fixes to support the NFSv4.2 READ_PLUS code.
 - A couple of fixes for pnfs/flexfiles read failover
 
 Cleanups:
 - Various cleanups for the SUNRPC xdr code in conjunction with the
   READ_PLUS fixes.
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Merge tag 'nfs-for-5.11-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Features:

   - NFSv3: Add emulation of lookupp() to improve open_by_filehandle()
     support

   - A series of patches to improve readdir performance, particularly
     with large directories

   - Basic support for using NFS/RDMA with the pNFS files and flexfiles
     drivers

   - Micro-optimisations for RDMA

   - RDMA tracing improvements

  Bugfixes:

   - Fix a long standing bug with xs_read_xdr_buf() when receiving
     partial pages (Dan Aloni)

   - Various fixes for getxattr and listxattr, when used over non-TCP
     transports

   - Fixes for containerised NFS from Sargun Dhillon

   - switch nfsiod to be an UNBOUND workqueue (Neil Brown)

   - READDIR should not ask for security label information if there is
     no LSM policy (Olga Kornievskaia)

   - Avoid using interval-based rebinding with TCP in lockd (Calum
     Mackay)

   - A series of RPC and NFS layer fixes to support the NFSv4.2
     READ_PLUS code

   - A couple of fixes for pnfs/flexfiles read failover

  Cleanups:

   - Various cleanups for the SUNRPC xdr code in conjunction with the
     READ_PLUS fixes"

* tag 'nfs-for-5.11-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (90 commits)
  NFS/pNFS: Fix a typo in ff_layout_resend_pnfs_read()
  pNFS/flexfiles: Avoid spurious layout returns in ff_layout_choose_ds_for_read
  NFSv4/pnfs: Add tracing for the deviceid cache
  fs/lockd: convert comma to semicolon
  NFSv4.2: fix error return on memory allocation failure
  NFSv4.2/pnfs: Don't use READ_PLUS with pNFS yet
  NFSv4.2: Deal with potential READ_PLUS data extent buffer overflow
  NFSv4.2: Don't error when exiting early on a READ_PLUS buffer overflow
  NFSv4.2: Handle hole lengths that exceed the READ_PLUS read buffer
  NFSv4.2: decode_read_plus_hole() needs to check the extent offset
  NFSv4.2: decode_read_plus_data() must skip padding after data segment
  NFSv4.2: Ensure we always reset the result->count in decode_read_plus()
  SUNRPC: When expanding the buffer, we may need grow the sparse pages
  SUNRPC: Cleanup - constify a number of xdr_buf helpers
  SUNRPC: Clean up open coded setting of the xdr_stream 'nwords' field
  SUNRPC: _copy_to/from_pages() now check for zero length
  SUNRPC: Cleanup xdr_shrink_bufhead()
  SUNRPC: Fix xdr_expand_hole()
  SUNRPC: Fixes for xdr_align_data()
  SUNRPC: _shift_data_left/right_pages should check the shift length
  ...
2020-12-17 12:15:03 -08:00
Linus Torvalds 1a50ede2b3 Highlights:
- Improve support for re-exporting NFS mounts
 - Replace NFSv4 XDR decoding C macros with xdr_stream helpers
 - Support for multiple RPC/RDMA chunks per RPC transaction
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Merge tag 'nfsd-5.11' of git://git.linux-nfs.org/projects/cel/cel-2.6

Pull nfsd updates from Chuck Lever:
 "Several substantial changes this time around:

   - Previously, exporting an NFS mount via NFSD was considered to be an
     unsupported feature. With v5.11, the community has attempted to
     make re-exporting a first-class feature of NFSD.

     This would enable the Linux in-kernel NFS server to be used as an
     intermediate cache for a remotely-located primary NFS server, for
     example, even with other NFS server implementations, like a NetApp
     filer, as the primary.

   - A short series of patches brings support for multiple RPC/RDMA data
     chunks per RPC transaction to the Linux NFS server's RPC/RDMA
     transport implementation.

     This is a part of the RPC/RDMA spec that the other premiere
     NFS/RDMA implementation (Solaris) has had for a very long time, and
     completes the implementation of RPC/RDMA version 1 in the Linux
     kernel's NFS server.

   - Long ago, NFSv4 support was introduced to NFSD using a series of C
     macros that hid dprintk's and goto's. Over time, the kernel's XDR
     implementation has been greatly improved, but these C macros have
     remained and become fallow. A series of patches in this pull
     request completely replaces those macros with the use of current
     kernel XDR infrastructure. Benefits include:

       - More robust input sanitization in NFSD's NFSv4 XDR decoders.

       - Make it easier to use common kernel library functions that use
         XDR stream APIs (for example, GSS-API).

       - Align the structure of the source code with the RFCs so it is
         easier to learn, verify, and maintain our XDR implementation.

       - Removal of more than a hundred hidden dprintk() call sites.

       - Removal of some explicit manipulation of pages to help make the
         eventual transition to xdr->bvec smoother.

   - On top of several related fixes in 5.10-rc, there are a few more
     fixes to get the Linux NFSD implementation of NFSv4.2 inter-server
     copy up to speed.

  And as usual, there is a pinch of seasoning in the form of a
  collection of unrelated minor bug fixes and clean-ups.

  Many thanks to all who contributed this time around!"

* tag 'nfsd-5.11' of git://git.linux-nfs.org/projects/cel/cel-2.6: (131 commits)
  nfsd: Record NFSv4 pre/post-op attributes as non-atomic
  nfsd: Set PF_LOCAL_THROTTLE on local filesystems only
  nfsd: Fix up nfsd to ensure that timeout errors don't result in ESTALE
  exportfs: Add a function to return the raw output from fh_to_dentry()
  nfsd: close cached files prior to a REMOVE or RENAME that would replace target
  nfsd: allow filesystems to opt out of subtree checking
  nfsd: add a new EXPORT_OP_NOWCC flag to struct export_operations
  Revert "nfsd4: support change_attr_type attribute"
  nfsd4: don't query change attribute in v2/v3 case
  nfsd: minor nfsd4_change_attribute cleanup
  nfsd: simplify nfsd4_change_info
  nfsd: only call inode_query_iversion in the I_VERSION case
  nfs_common: need lock during iterate through the list
  NFSD: Fix 5 seconds delay when doing inter server copy
  NFSD: Fix sparse warning in nfs4proc.c
  SUNRPC: Remove XDRBUF_SPARSE_PAGES flag in gss_proxy upcall
  sunrpc: clean-up cache downcall
  nfsd: Fix message level for normal termination
  NFSD: Remove macros that are no longer used
  NFSD: Replace READ* macros in nfsd4_decode_compound()
  ...
2020-12-15 18:52:30 -08:00
Trond Myklebust edffb84cc8 NFSoRDmA Client updates for Linux 5.11
Cleanups and improvements:
   - Remove use of raw kernel memory addresses in tracepoints
   - Replace dprintk() call sites in ERR_CHUNK path
   - Trace unmap sync calls
   - Optimize MR DMA-unmapping
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Merge tag 'nfs-rdma-for-5.11-1' of git://git.linux-nfs.org/projects/anna/linux-nfs into linux-next

NFSoRDmA Client updates for Linux 5.11

Cleanups and improvements:
  - Remove use of raw kernel memory addresses in tracepoints
  - Replace dprintk() call sites in ERR_CHUNK path
  - Trace unmap sync calls
  - Optimize MR DMA-unmapping

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-15 20:08:41 -05:00
Trond Myklebust 5802f7c2a6 SUNRPC: When expanding the buffer, we may need grow the sparse pages
If we're shifting the page data to the right, and this happens to be a
sparse page array, then we may need to allocate new pages in order to
receive the data.

Reported-by: "Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust f8d0e60f10 SUNRPC: Cleanup - constify a number of xdr_buf helpers
There are a number of xdr helpers for struct xdr_buf that do not change
the structure itself. Mark those as taking const pointers for
documentation purposes.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust 5a5f1c2c2c SUNRPC: Clean up open coded setting of the xdr_stream 'nwords' field
Move the setting of the xdr_stream 'nwords' field into the helpers that
reset the xdr_stream cursor.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust e43ac22b83 SUNRPC: _copy_to/from_pages() now check for zero length
Clean up callers of _copy_to/from_pages() that still check for a zero
length.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust 6707fbd7d3 SUNRPC: Cleanup xdr_shrink_bufhead()
Clean up xdr_shrink_bufhead() to use the new helpers instead of doing
its own thing.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust c4f2f591f0 SUNRPC: Fix xdr_expand_hole()
We do want to try to grow the buffer if possible, but if that attempt
fails, we still want to move the data and truncate the XDR message.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust 9a20f6f4e6 SUNRPC: Fixes for xdr_align_data()
The main use case right now for xdr_align_data() is to shift the page
data to the left, and in practice shrink the total XDR data buffer.
This patch ensures that we fix up the accounting for the buffer length
as we shift that data around.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Trond Myklebust c54e959b36 SUNRPC: _shift_data_left/right_pages should check the shift length
Exit early if the shift is zero.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Chuck Lever 15261b9126 xprtrdma: Fix XDRBUF_SPARSE_PAGES support
Olga K. observed that rpcrdma_marsh_req() allocates sparse pages
only when it has determined that a Reply chunk is necessary. There
are plenty of cases where no Reply chunk is needed, but the
XDRBUF_SPARSE_PAGES flag is set. The result would be a crash in
rpcrdma_inline_fixup() when it tries to copy parts of the received
Reply into a missing page.

To avoid crashing, handle sparse page allocation up front.

Until XATTR support was added, this issue did not appear often
because the only SPARSE_PAGES consumer always expected a reply large
enough to always require a Reply chunk.

Reported-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:51:07 -05:00
Dan Aloni ac9645c873 sunrpc: fix xs_read_xdr_buf for partial pages receive
When receiving pages data, return value 'ret' when positive includes
`buf->page_base`, so we should subtract that before it is used for
changing `offset` and comparing against `want`.

This was discovered on the very rare cases where the server returned a
chunk of bytes that when added to the already received amount of bytes
for the pages happened to match the current `recv.len`, for example
on this case:

     buf->page_base : 258356
     actually received from socket: 1740
     ret : 260096
     want : 260096

In this case neither of the two 'if ... goto out' trigger, and we
continue to tail parsing.

Worth to mention that the ensuing EMSGSIZE from the continued execution of
`xs_read_xdr_buf` may be observed by an application due to 4 superfluous
bytes being added to the pages data.

Fixes: 277e4ab7d5 ("SUNRPC: Simplify TCP receive code by switching to using iterators")
Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-14 06:46:55 -05:00
Chuck Lever 5e54dafbe0 SUNRPC: Remove XDRBUF_SPARSE_PAGES flag in gss_proxy upcall
There's no need to defer allocation of pages for the receive buffer.

- This upcall is quite infrequent
- gssp_alloc_receive_pages() can allocate the pages with GFP_KERNEL,
  unlike the transport
- gssp_alloc_receive_pages() knows exactly how many pages are needed

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Olga Kornievskaia <kolga@netapp.com>
2020-12-09 09:38:34 -05:00
Roberto Bergantinos Corpas 4b5cff7ed8 sunrpc: clean-up cache downcall
We can simplify code around cache_downcall unifying memory
allocations using kvmalloc. This has the benefit of getting rid of
cache_slow_downcall (and queue_io_mutex), and also matches userland
allocation size and limits.

Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-12-09 09:38:34 -05:00
Fedor Tokarev 35a6d39672 net: sunrpc: Fix 'snprintf' return value check in 'do_xprt_debugfs'
'snprintf' returns the number of characters which would have been written
if enough space had been available, excluding the terminating null byte.
Thus, the return value of 'sizeof(buf)' means that the last character
has been dropped.

Signed-off-by: Fedor Tokarev <ftokarev@gmail.com>
Fixes: 2f34b8bfae ("SUNRPC: add links for all client xprts to debugfs")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:54 -05:00
Trond Myklebust eee1f54964 SUNRPC: Fix open coded xdr_stream_remaining()
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:54 -05:00
Trond Myklebust 0279024f22 SUNRPC: Fix up xdr_set_page()
While we always want to align to the next page and/or the beginning of
the tail buffer when we call xdr_set_next_page(), the functions
xdr_align_data() and xdr_expand_hole() really want to align to the next
object in that next page or tail.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:54 -05:00
Trond Myklebust 9ed5af268e SUNRPC: Clean up the handling of page padding in rpc_prepare_reply_pages()
rpc_prepare_reply_pages() currently expects the 'hdrsize' argument to
contain the length of the data that we expect to want placed in the head
kvec plus a count of 1 word of padding that is placed after the page data.
This is very confusing when trying to read the code, and sometimes leads
to callers adding an arbitrary value of '1' just in order to satisfy the
requirement (whether or not the page data actually needs such padding).

This patch aims to clarify the code by changing the 'hdrsize' argument
to remove that 1 word of padding. This means we need to subtract the
padding from all the existing callers.

Fixes: 02ef04e432 ("NFS: Account for XDR pad of buf->pages")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust 1d97316692 SUNRPC: Fix up xdr_read_pages() to take arbitrary object lengths
Fix up xdr_read_pages() so that it can handle object lengths that are
larger than the page length, by simply aligning to the next object in
the buffer tail.
The function will continue to return the length of the truncate object
data that actually fit into the pages.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust 8d86e373b0 SUNRPC: Clean up helpers xdr_set_iov() and xdr_set_page_base()
Allow xdr_set_iov() to set a base so that we can use it to set the
cursor to a specific position in the kvec buffer.

If the new base overflows the kvec/pages buffer in either xdr_set_iov()
or xdr_set_page_base(), then truncate it so that we point to the end of
the buffer.

Finally, change both function to return the number of bytes remaining to
read in their buffers.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust 2b1f83d108 SUNRPC: Fix up typo in xdr_init_decode()
We already know that the head buffer and page are empty, so if there is
any data, it is in the tail.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust 4aceaaea5e SUNRPC: Fix up open coded kmemdup_nul()
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust c87b056e58 SUNRPC: Remove unused function xprt_load_transport()
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:53 -05:00
Trond Myklebust 1fc5f13186 SUNRPC: Add a helper to return the transport identifier given a netid
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:52 -05:00
Trond Myklebust 9bccd26461 SUNRPC: Close a race with transport setup and module put
After we've looked up the transport module, we need to ensure it can't
go away until we've finished running the transport setup code.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:52 -05:00
Trond Myklebust d5aa6b22e2 SUNRPC: xprt_load_transport() needs to support the netid "rdma6"
According to RFC5666, the correct netid for an IPv6 addressed RDMA
transport is "rdma6", which we've supported as a mount option since
Linux-4.7. The problem is when we try to load the module "xprtrdma6",
that will fail, since there is no modulealias of that name.

Fixes: 181342c5eb ("xprtrdma: Add rdma6 option to support NFS/RDMA IPv6")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:52 -05:00
Trond Myklebust e4c72201b6 SUNRPC: rpc_wake_up() should wake up tasks in the correct order
Currently, we wake up the tasks by priority queue ordering, which means
that we ignore the batching that is supposed to help with QoS issues.

Fixes: c049f8ea9a ("SUNRPC: Remove the bh-safe lock requirement on the rpc_wait_queue->lock")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02 14:05:51 -05:00
Chuck Lever 0359af7ac3 SUNRPC: Remove XDRBUF_SPARSE_PAGES flag in gss_proxy upcall
There's no need to defer allocation of pages for the receive buffer.

- This upcall is quite infrequent
- gssp_alloc_receive_pages() can allocate the pages with GFP_KERNEL,
  unlike the transport
- gssp_alloc_receive_pages() knows exactly how many pages are needed

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-12-02 10:06:52 -05:00
Chuck Lever c1346a1216 NFSD: Replace the internals of the READ_BUF() macro
Convert the READ_BUF macro in nfs4xdr.c from open code to instead
use the new xdr_stream-style decoders already in use by the encode
side (and by the in-kernel NFS client implementation). Once this
conversion is done, each individual NFSv4 argument decoder can be
independently cleaned up to replace these macros with C code.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 14:46:36 -05:00
Chuck Lever 5191955d6f SUNRPC: Prepare for xdr_stream-style decoding on the server-side
A "permanent" struct xdr_stream is allocated in struct svc_rqst so
that it is usable by all server-side decoders. A per-rqst scratch
buffer is also allocated to handle decoding XDR data items that
cross page boundaries.

To demonstrate how it will be used, add the first call site for the
new svcxdr_init_decode() API.

As an additional part of the overall conversion, add symbolic
constants for successful and failed XDR operations. Returning "0" is
overloaded. Sometimes it means something failed, but sometimes it
means success. To make it more clear when XDR decoding functions
succeed or fail, introduce symbolic constants.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 14:46:35 -05:00
Chuck Lever 0ae4c3e8a6 SUNRPC: Add xdr_set_scratch_page() and xdr_reset_scratch_buffer()
Clean up: De-duplicate some frequently-used code.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 14:46:35 -05:00
Chuck Lever 156708adf2 SUNRPC: Move the svc_xdr_recvfrom() tracepoint
Commit c509f15a58 ("SUNRPC: Split the xdr_buf event class") added
display of the rqst's XID to the svc_xdr_buf_class. However, when
the recvfrom tracepoint fires, rq_xid has yet to be filled in with
the current XID. So it ends up recording the previous XID that was
handled by that svc_rqst.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:24 -05:00
Chuck Lever d7cc739726 svcrdma: support multiple Read chunks per RPC
An efficient way to handle multiple Read chunks is to post them all
together and then take a single completion. This is also how the
code is already structured: when the Read completion fires, all
portions of the incoming RPC message are available to be assembled.

The difficult problem is setting up the Read sink buffers so that
the server pulls the client's data into place, making subsequent
pull-up unnecessary. There are several cases:

* No Read chunks. No-op.

* One data item Read chunk. This is the fast case, where the inline
  part of the RPC-over-RDMA message becomes the head and tail, and
  the data item chunk is placed in buf->pages.

* A Position-zero Read chunk. Treated like TCP: the Read chunk is
  pulled into contiguous pages.

+ A Position-zero Read chunk with data item chunks. Treated like
  TCP: all of the Read chunks are pulled into contiguous pages.

+ Multiple data item chunks. Treated like TCP: the inline part is
  copied and the data item chunks are pulled into contiguous pages.

The "*" cases are already supported. This patch adds support for the
"+" cases.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever d96962e6d0 svcrdma: Use the new parsed chunk list when pulling Read chunks
As a pre-requisite for handling multiple Read chunks in each Read
list, convert svc_rdma_recv_read_chunk() to use the new parsed Read
chunk list.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever bafe9c27d5 svcrdma: Rename info::ri_chunklen
I'm about to change the purpose of ri_chunklen: Instead of tracking
the number of bytes in one Read chunk, it will track the total
number of bytes in the Read list. Rename it for clarity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever b704be09dc svcrdma: Clean up chunk tracepoints
We already have trace_svcrdma_decode_rseg(), which records each
ingress Read segment. Instead of reporting those again when they
are about to be posted as RDMA Reads, let's fire one tracepoint
before posting each type of chunk.

So we'll get:

        nfsd-1998  [002]   321.666615: svcrdma_decode_rseg:  cq.id=4 cid=42 segno=0 position=0 192@0x013ca9ebfae14000:0xb0010b05
        nfsd-1998  [002]   321.666615: svcrdma_decode_rseg:  cq.id=4 cid=42 segno=1 position=0 7688@0x013ca9ebf914e000:0xb0010a05
        nfsd-1998  [002]   321.666615: svcrdma_decode_rseg:  cq.id=4 cid=42 segno=2 position=0 28@0x013ca9ebfae15000:0xb0010905
        nfsd-1998  [002]   321.666622: svcrdma_decode_rqst:  cq.id=4 cid=42 xid=0x013ca9eb vers=1 credits=128 proc=RDMA_NOMSG hdrlen=100

        nfsd-1998  [002]   321.666642: svcrdma_post_read_chunk: cq.id=3 cid=112 sqecount=3

kworker/2:1H-221   [002]   321.673949: svcrdma_wc_read:      cq.id=3 cid=112 status=SUCCESS (0/0x0)

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever 7954c8503b svcrdma: Remove chunk list pointers
Clean up: These pointers are no longer used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever 41bc163ffe svcrdma: Support multiple Write chunks in svc_rdma_send_reply_chunk
Refactor svc_rdma_send_reply_chunk() so that it Sends only the parts
of rq_res that do not contain a result payload.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever 2371bcc056 svcrdma: Support multiple Write chunks in svc_rdma_map_reply_msg()
Refactor: svc_rdma_map_reply_msg() is restructured to DMA map only
the parts of rq_res that do not contain a result payload.

This change has been tested to confirm that it does not cause a
regression in the no Write chunk and single Write chunk cases.
Multiple Write chunks have not been tested.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:23 -05:00
Chuck Lever 9d0b09d5ef svcrdma: Support multiple write chunks when pulling up
When counting the number of SGEs needed to construct a Send request,
do not count result payloads. And, when copying the Reply message
into the pull-up buffer, result payloads are not to be copied to the
Send buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 6911f3e10c svcrdma: Use parsed chunk lists to encode Reply transport headers
Refactor: Instead of re-parsing the ingress RPC Call transport
header when constructing the egress RPC Reply transport header, use
the new parsed Write list and Reply chunk, which are version-
agnostic and already XDR decoded.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 7a1cbfa180 svcrdma: Use parsed chunk lists to construct RDMA Writes
Refactor: Instead of re-parsing the ingress RPC Call transport
header when constructing RDMA Writes, use the new parsed chunk lists
for the Write list and Reply chunk, which are version-agnostic and
already XDR-decoded.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 58b2e0fefa svcrdma: Use parsed chunk lists to detect reverse direction replies
Refactor: Don't duplicate header decoding smarts here. Instead, use
the new parsed chunk lists.

Note that the XID sanity test is also removed. The XID is already
looked up by the cb handler, and is rejected if it's not recognized.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever eb3de6a49d svcrdma: Use parsed chunk lists to derive the inv_rkey
Refactor: Don't duplicate header decoding smarts here. Instead, use
the new parsed chunk lists.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 78147ca8b4 svcrdma: Add a "parsed chunk list" data structure
This simple data structure binds the location of each data payload
inside of an RPC message to the chunk that will be used to push it
to or pull it from the client.

There are several benefits to this small additional overhead:

 * It enables support for more than one chunk in incoming Read and
   Write lists.

 * It translates the version-specific on-the-wire format into a
   generic in-memory structure, enabling support for multiple
   versions of the RPC/RDMA transport protocol.

 * It enables the server to re-organize a chunk list if it needs to
   adjust where Read chunk data lands in server memory without
   altering the contents of the XDR-encoded Receive buffer.

Construction of these lists is done while sanity checking each
incoming RPC/RDMA header. Subsequent patches will make use of the
generated data structures.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever ded380f100 svcrdma: Clean up svc_rdma_encode_reply_chunk()
Refactor: Match the control flow of svc_rdma_encode_write_list().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever f6ad77590a svcrdma: Post RDMA Writes while XDR encoding replies
The only RPC/RDMA ordering requirement between RDMA Writes and RDMA
Sends is that the responder must post the Writes on the Send queue
before posting the Send that conveys the RPC Reply for that Write
payload.

The Linux NFS server implementation now has a transport method that
can post result Payload Writes earlier than svc_rdma_sendto:

   ->xpo_result_payload()

This gets RDMA Writes going earlier so they are more likely to be
complete at the remote end before the Send completes.

Some care must be taken with pulled-up Replies. We don't want to
push the Write chunk and then send the same payload data via Send.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 76e5492b16 NFSD: Invoke svc_encode_result_payload() in "read" NFSD encoders
Have the NFSD encoders annotate the boundaries of every
direct-data-placement eligible result data payload. Then change
svcrdma to use that annotation instead of the xdr->page_len
when handling Write chunks.

For NFSv4 on RDMA, that enables the ability to recognize multiple
result payloads per compound. This is a pre-requisite for supporting
multiple Write chunks per RPC transaction.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:22 -05:00
Chuck Lever 03493bca08 SUNRPC: Rename svc_encode_read_payload()
Clean up: "result payload" is a less confusing name for these
payloads. "READ payload" reflects only the NFS usage.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:21 -05:00
Chuck Lever ab1394ee7a svcrdma: Refactor the RDMA Write path
Refactor for subsequent changes.

Constify the xdr_buf argument to ensure the code here does not
modify it, and to enable callers to pass in a
"const struct xdr_buf *".

At the same time, rename the helper functions, which emit RDMA
Writes, not RDMA Sends, and add documenting comments.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:21 -05:00
Chuck Lever 51bad8cc13 svcrdma: Const-ify the xdr_buf arguments
Clean up: Ensure the code in rw.c does not modify the argument, and
enable callers to also use "const struct xdr_buf *".

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:21 -05:00
Chuck Lever 5a7e702670 SUNRPC: Adjust synopsis of xdr_buf_subsegment()
Clean up: This enables xdr_buf_subsegment()'s callers to pass in a
const pointer to that buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:21 -05:00
Chuck Lever e5decb2eb5 svcrdma: Catch another Reply chunk overflow case
When space in the Reply chunk runs out in the middle of a segment,
we end up passing a zero-length SGL to rdma_rw_ctx_init(), and it
oopses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-11-30 13:00:21 -05:00
Mauro Carvalho Chehab c1639be98b net: datagram: fix some kernel-doc markups
Some identifiers have different names between their prototypes
and the kernel-doc markup.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-11-17 14:15:03 -08:00
Chuck Lever 7a03aeb66c xprtrdma: Micro-optimize MR DMA-unmapping
Now that rpcrdma_ep is no longer part of rpcrdma_xprt, there are
four or five serial address dereferences needed to get to the
IB device needed for DMA unmapping.

Instead, let's use the same pattern that regbufs use: cache a
pointer to the device in the MR, and use that as the indication
that unmapping is necessary.

This also guarantees that the exact same device is used for DMA
mapping and unmapping, even if the r_xprt's ep has been replaced. I
don't think this can happen today, but future changes might break
this assumption.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:57:39 -05:00
Chuck Lever ef2be5918f xprtrdma: Move rpcrdma_mr_put()
Clean up: This function is now invoked only in frwr_ops.c. The move
enables deduplication of the trace_xprtrdma_mr_unmap() call site.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:52:18 -05:00
Chuck Lever 8e24e191d4 xprtrdma: Trace unmap_sync calls
->buf_free is called nearly once per RPC. Only rarely does
xprt_rdma_free() have to do anything, thus tracing every one of
these calls seems unnecessary. Instead, just throw a trace event
when that one occasional RPC still has MRs that need to be
released.

xprt_rdma_free() is further micro-optimized to reduce the amount of
work done in the common case.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:49:12 -05:00
Chuck Lever 7703db978d xprtrdma: Display the task ID when reporting MR events
Tie each MR event to the requesting rpc_task to make it easier to
follow MR ownership and control flow.

MR unmapping and recycling can happen in the background, after an
MR's mr_req field is stale, so set up a separate tracepoint class
for those events.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:46:54 -05:00
Chuck Lever 0307cdec7c xprtrdma: Clean up trace_xprtrdma_nomrs()
- Rename it following the "_err" suffix convention
- Replace display of kernel memory addresses
- Tie MR exhaustion to a peer IP address, similar to the createmrs
   tracepoint

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:44:05 -05:00
Chuck Lever d11e934606 xprtrdma: Clean up xprtrdma callback tracepoints
- Replace displayed kernel memory addresses
- Tie the XID and event with the peer's IP address

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:40:38 -05:00
Chuck Lever 03ffd92494 xprtrdma: Clean up tracepoints in the reply path
Replace unnecessary display of kernel memory addresses.

Also, there are no longer any trace_xprtrdma_defer_cmp() call sites.
And remove the trace_xprtrdma_leaked_rep() tracepoint because there
doesn't seem to be an overwhelming need to have a tracepoint for
catching a software bug that has long since been fixed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:36:00 -05:00
Chuck Lever 3a9568fedc xprtrdma: Clean up reply parsing error tracepoints
- Rename the tracepoints with the "_err" suffix to indicate these
  are rare error events
- Replace display of kernel memory addresses
- Tie the XID and error to a connection IP address instead

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:32:31 -05:00
Chuck Lever 36a55edfc3 xprtrdma: Clean up trace_xprtrdma_post_linv
- Replace the display of kernel memory addresses
- Add "_err" to the end of its name to indicate that it's a
  tracepoint that fires only when there's an error

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:26:06 -05:00
Chuck Lever 5ecef9c843 xprtrdma: Introduce FRWR completion IDs
Set up a completion ID in each rpcrdma_frwr. The ID is used to match
an incoming completion to a transport (CQ) and other MR-related
activity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:23:29 -05:00
Chuck Lever b2e7467f26 xprtrdma: Introduce Send completion IDs
Set up a completion ID in each rpcrdma_req. The ID is used to match
an incoming Send completion to a transport and to a previous
ib_post_send().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:21:12 -05:00
Chuck Lever af5865d278 xprtrdma: Introduce Receive completion IDs
Set up a completion ID in each rpcrdma_rep. The ID is used to match
an incoming Receive completion to a transport and to a previous
ib_post_recv().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:18:58 -05:00
Chuck Lever 3821e232eb xprtrdma: Replace dprintk call sites in ERR_CHUNK path
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-11-11 10:12:30 -05:00
Dan Carpenter ae2975046d net/sunrpc: fix useless comparison in proc_do_xprt()
In the original code, the "if (*lenp < 0)" check didn't work because
"*lenp" is unsigned.  Fortunately, the memory_read_from_buffer() call
will never fail in this context so it doesn't affect runtime.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-11-08 16:28:25 -05:00
Dan Carpenter d435c05ab0 net/sunrpc: return 0 on attempt to write to "transports"
You can't write to this file because the permissions are 0444.  But
it sort of looked like you could do a write and it would result in
a read.  Then it looked like proc_sys_call_handler() just ignored
it.  Which is confusing.  It's more clear if the "write" just
returns zero.

Also, the "lenp" pointer is never NULL so that check can be removed.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-11-06 15:56:18 -05:00
Linus Torvalds 24717cfbbb The one new feature this time, from Anna Schumaker, is READ_PLUS, which
has the same arguments as READ but allows the server to return an array
 of data and hole extents.
 
 Otherwise it's a lot of cleanup and bugfixes.
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Merge tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "The one new feature this time, from Anna Schumaker, is READ_PLUS,
  which has the same arguments as READ but allows the server to return
  an array of data and hole extents.

  Otherwise it's a lot of cleanup and bugfixes"

* tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux: (43 commits)
  NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy
  SUNRPC: fix copying of multiple pages in gss_read_proxy_verf()
  sunrpc: raise kernel RPC channel buffer size
  svcrdma: fix bounce buffers for unaligned offsets and multiple pages
  nfsd: remove unneeded break
  net/sunrpc: Fix return value for sysctl sunrpc.transports
  NFSD: Encode a full READ_PLUS reply
  NFSD: Return both a hole and a data segment
  NFSD: Add READ_PLUS hole segment encoding
  NFSD: Add READ_PLUS data support
  NFSD: Hoist status code encoding into XDR encoder functions
  NFSD: Map nfserr_wrongsec outside of nfsd_dispatch
  NFSD: Remove the RETURN_STATUS() macro
  NFSD: Call NFSv2 encoders on error returns
  NFSD: Fix .pc_release method for NFSv2
  NFSD: Remove vestigial typedefs
  NFSD: Refactor nfsd_dispatch() error paths
  NFSD: Clean up nfsd_dispatch() variables
  NFSD: Clean up stale comments in nfsd_dispatch()
  NFSD: Clean up switch statement in nfsd_dispatch()
  ...
2020-10-22 09:44:27 -07:00
Linus Torvalds 59f0e7eb2f NFS Client Updates for Linux 5.10
- Stable Fixes:
   - Wait for stateid updates after CLOSE/OPEN_DOWNGRADE # v5.4+
   - Fix nfs_path in case of a rename retry
   - Support EXCHID4_FLAG_SUPP_FENCE_OPS v4.2 EXCHANGE_ID flag
 
 - New features and improvements:
   - Replace dprintk() calls with tracepoints
   - Make cache consistency bitmap dynamic
   - Added support for the NFS v4.2 READ_PLUS operation
   - Improvements to net namespace uniquifier
 
 - Other bugfixes and cleanups
   - Remove redundant clnt pointer
   - Don't update timeout values on connection resets
   - Remove redundant tracepoints
   - Various cleanups to comments
   - Fix oops when trying to use copy_file_range with v4.0 source server
   - Improvements to flexfiles mirrors
   - Add missing "local_lock=posix" mount option
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Merge tag 'nfs-for-5.10-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client updates from Anna Schumaker:
 "Stable Fixes:
   - Wait for stateid updates after CLOSE/OPEN_DOWNGRADE # v5.4+
   - Fix nfs_path in case of a rename retry
   - Support EXCHID4_FLAG_SUPP_FENCE_OPS v4.2 EXCHANGE_ID flag

  New features and improvements:
   - Replace dprintk() calls with tracepoints
   - Make cache consistency bitmap dynamic
   - Added support for the NFS v4.2 READ_PLUS operation
   - Improvements to net namespace uniquifier

  Other bugfixes and cleanups:
   - Remove redundant clnt pointer
   - Don't update timeout values on connection resets
   - Remove redundant tracepoints
   - Various cleanups to comments
   - Fix oops when trying to use copy_file_range with v4.0 source server
   - Improvements to flexfiles mirrors
   - Add missing 'local_lock=posix' mount option"

* tag 'nfs-for-5.10-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (55 commits)
  NFSv4.2: support EXCHGID4_FLAG_SUPP_FENCE_OPS 4.2 EXCHANGE_ID flag
  NFSv4: Fix up RCU annotations for struct nfs_netns_client
  NFS: Only reference user namespace from nfs4idmap struct instead of cred
  nfs: add missing "posix" local_lock constant table definition
  NFSv4: Use the net namespace uniquifier if it is set
  NFSv4: Clean up initialisation of uniquified client id strings
  NFS: Decode a full READ_PLUS reply
  SUNRPC: Add an xdr_align_data() function
  NFS: Add READ_PLUS hole segment decoding
  SUNRPC: Add the ability to expand holes in data pages
  SUNRPC: Split out _shift_data_right_tail()
  SUNRPC: Split out xdr_realign_pages() from xdr_align_pages()
  NFS: Add READ_PLUS data segment support
  NFS: Use xdr_page_pos() in NFSv4 decode_getacl()
  SUNRPC: Implement a xdr_page_pos() function
  SUNRPC: Split out a function for setting current page
  NFS: fix nfs_path in case of a rename retry
  fs: nfs: return per memcg count for xattr shrinkers
  NFSv4: Wait for stateid updates after CLOSE/OPEN_DOWNGRADE
  nfs: remove incorrect fallthrough label
  ...
2020-10-20 13:26:30 -07:00
Martijn de Gouw d48c812474 SUNRPC: fix copying of multiple pages in gss_read_proxy_verf()
When the passed token is longer than 4032 bytes, the remaining part
of the token must be copied from the rqstp->rq_arg.pages. But the
copy must make sure it happens in a consecutive way.

With the existing code, the first memcpy copies 'length' bytes from
argv->iobase, but since the header is in front, this never fills the
whole first page of in_token->pages.

The mecpy in the loop copies the following bytes, but starts writing at
the next page of in_token->pages.  This leaves the last bytes of page 0
unwritten.

Symptoms were that users with many groups were not able to access NFS
exports, when using Active Directory as the KDC.

Signed-off-by: Martijn de Gouw <martijn.de.gouw@prodrive-technologies.com>
Fixes: 5866efa8cb "SUNRPC: Fix svcauth_gss_proxy_init()"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-10-20 13:21:30 -04:00
Roberto Bergantinos Corpas 27a1e8a0f7 sunrpc: raise kernel RPC channel buffer size
Its possible that using AUTH_SYS and mountd manage-gids option a
user may hit the 8k RPC channel buffer limit. This have been observed
on field, causing unanswered RPCs on clients after mountd fails to
write on channel :

rpc.mountd[11231]: auth_unix_gid: error writing reply

Userland nfs-utils uses a buffer size of 32k (RPC_CHAN_BUF_SIZE), so
lets match those two.

Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-10-20 13:21:30 -04:00
Dan Aloni c327a310ec svcrdma: fix bounce buffers for unaligned offsets and multiple pages
This was discovered using O_DIRECT at the client side, with small
unaligned file offsets or IOs that span multiple file pages.

Fixes: e248aa7be8 ("svcrdma: Remove max_sge check at connect time")
Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-10-16 15:15:04 -04:00
Artur Molchanov c09f56b8f6 net/sunrpc: Fix return value for sysctl sunrpc.transports
Fix returning value for sysctl sunrpc.transports.
Return error code from sysctl proc_handler function proc_do_xprt instead of number of the written bytes.
Otherwise sysctl returns random garbage for this key.

Since v1:
- Handle negative returned value from memory_read_from_buffer as an error

Signed-off-by: Artur Molchanov <arturmolchanov@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-10-16 15:15:04 -04:00
Linus Torvalds 9ff9b0d392 networking changes for the 5.10 merge window
Add redirect_neigh() BPF packet redirect helper, allowing to limit stack
 traversal in common container configs and improving TCP back-pressure.
 Daniel reports ~10Gbps => ~15Gbps single stream TCP performance gain.
 
 Expand netlink policy support and improve policy export to user space.
 (Ge)netlink core performs request validation according to declared
 policies. Expand the expressiveness of those policies (min/max length
 and bitmasks). Allow dumping policies for particular commands.
 This is used for feature discovery by user space (instead of kernel
 version parsing or trial and error).
 
 Support IGMPv3/MLDv2 multicast listener discovery protocols in bridge.
 
 Allow more than 255 IPv4 multicast interfaces.
 
 Add support for Type of Service (ToS) reflection in SYN/SYN-ACK
 packets of TCPv6.
 
 In Multi-patch TCP (MPTCP) support concurrent transmission of data
 on multiple subflows in a load balancing scenario. Enhance advertising
 addresses via the RM_ADDR/ADD_ADDR options.
 
 Support SMC-Dv2 version of SMC, which enables multi-subnet deployments.
 
 Allow more calls to same peer in RxRPC.
 
 Support two new Controller Area Network (CAN) protocols -
 CAN-FD and ISO 15765-2:2016.
 
 Add xfrm/IPsec compat layer, solving the 32bit user space on 64bit
 kernel problem.
 
 Add TC actions for implementing MPLS L2 VPNs.
 
 Improve nexthop code - e.g. handle various corner cases when nexthop
 objects are removed from groups better, skip unnecessary notifications
 and make it easier to offload nexthops into HW by converting
 to a blocking notifier.
 
 Support adding and consuming TCP header options by BPF programs,
 opening the doors for easy experimental and deployment-specific
 TCP option use.
 
 Reorganize TCP congestion control (CC) initialization to simplify life
 of TCP CC implemented in BPF.
 
 Add support for shipping BPF programs with the kernel and loading them
 early on boot via the User Mode Driver mechanism, hence reusing all the
 user space infra we have.
 
 Support sleepable BPF programs, initially targeting LSM and tracing.
 
 Add bpf_d_path() helper for returning full path for given 'struct path'.
 
 Make bpf_tail_call compatible with bpf-to-bpf calls.
 
 Allow BPF programs to call map_update_elem on sockmaps.
 
 Add BPF Type Format (BTF) support for type and enum discovery, as
 well as support for using BTF within the kernel itself (current use
 is for pretty printing structures).
 
 Support listing and getting information about bpf_links via the bpf
 syscall.
 
 Enhance kernel interfaces around NIC firmware update. Allow specifying
 overwrite mask to control if settings etc. are reset during update;
 report expected max time operation may take to users; support firmware
 activation without machine reboot incl. limits of how much impact
 reset may have (e.g. dropping link or not).
 
 Extend ethtool configuration interface to report IEEE-standard
 counters, to limit the need for per-vendor logic in user space.
 
 Adopt or extend devlink use for debug, monitoring, fw update
 in many drivers (dsa loop, ice, ionic, sja1105, qed, mlxsw,
 mv88e6xxx, dpaa2-eth).
 
 In mlxsw expose critical and emergency SFP module temperature alarms.
 Refactor port buffer handling to make the defaults more suitable and
 support setting these values explicitly via the DCBNL interface.
 
 Add XDP support for Intel's igb driver.
 
 Support offloading TC flower classification and filtering rules to
 mscc_ocelot switches.
 
 Add PTP support for Marvell Octeontx2 and PP2.2 hardware, as well as
 fixed interval period pulse generator and one-step timestamping in
 dpaa-eth.
 
 Add support for various auth offloads in WiFi APs, e.g. SAE (WPA3)
 offload.
 
 Add Lynx PHY/PCS MDIO module, and convert various drivers which have
 this HW to use it. Convert mvpp2 to split PCS.
 
 Support Marvell Prestera 98DX3255 24-port switch ASICs, as well as
 7-port Mediatek MT7531 IP.
 
 Add initial support for QCA6390 and IPQ6018 in ath11k WiFi driver,
 and wcn3680 support in wcn36xx.
 
 Improve performance for packets which don't require much offloads
 on recent Mellanox NICs by 20% by making multiple packets share
 a descriptor entry.
 
 Move chelsio inline crypto drivers (for TLS and IPsec) from the crypto
 subtree to drivers/net. Move MDIO drivers out of the phy directory.
 
 Clean up a lot of W=1 warnings, reportedly the actively developed
 subsections of networking drivers should now build W=1 warning free.
 
 Make sure drivers don't use in_interrupt() to dynamically adapt their
 code. Convert tasklets to use new tasklet_setup API (sadly this
 conversion is not yet complete).
 
 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:

 - Add redirect_neigh() BPF packet redirect helper, allowing to limit
   stack traversal in common container configs and improving TCP
   back-pressure.

   Daniel reports ~10Gbps => ~15Gbps single stream TCP performance gain.

 - Expand netlink policy support and improve policy export to user
   space. (Ge)netlink core performs request validation according to
   declared policies. Expand the expressiveness of those policies
   (min/max length and bitmasks). Allow dumping policies for particular
   commands. This is used for feature discovery by user space (instead
   of kernel version parsing or trial and error).

 - Support IGMPv3/MLDv2 multicast listener discovery protocols in
   bridge.

 - Allow more than 255 IPv4 multicast interfaces.

 - Add support for Type of Service (ToS) reflection in SYN/SYN-ACK
   packets of TCPv6.

 - In Multi-patch TCP (MPTCP) support concurrent transmission of data on
   multiple subflows in a load balancing scenario. Enhance advertising
   addresses via the RM_ADDR/ADD_ADDR options.

 - Support SMC-Dv2 version of SMC, which enables multi-subnet
   deployments.

 - Allow more calls to same peer in RxRPC.

 - Support two new Controller Area Network (CAN) protocols - CAN-FD and
   ISO 15765-2:2016.

 - Add xfrm/IPsec compat layer, solving the 32bit user space on 64bit
   kernel problem.

 - Add TC actions for implementing MPLS L2 VPNs.

 - Improve nexthop code - e.g. handle various corner cases when nexthop
   objects are removed from groups better, skip unnecessary
   notifications and make it easier to offload nexthops into HW by
   converting to a blocking notifier.

 - Support adding and consuming TCP header options by BPF programs,
   opening the doors for easy experimental and deployment-specific TCP
   option use.

 - Reorganize TCP congestion control (CC) initialization to simplify
   life of TCP CC implemented in BPF.

 - Add support for shipping BPF programs with the kernel and loading
   them early on boot via the User Mode Driver mechanism, hence reusing
   all the user space infra we have.

 - Support sleepable BPF programs, initially targeting LSM and tracing.

 - Add bpf_d_path() helper for returning full path for given 'struct
   path'.

 - Make bpf_tail_call compatible with bpf-to-bpf calls.

 - Allow BPF programs to call map_update_elem on sockmaps.

 - Add BPF Type Format (BTF) support for type and enum discovery, as
   well as support for using BTF within the kernel itself (current use
   is for pretty printing structures).

 - Support listing and getting information about bpf_links via the bpf
   syscall.

 - Enhance kernel interfaces around NIC firmware update. Allow
   specifying overwrite mask to control if settings etc. are reset
   during update; report expected max time operation may take to users;
   support firmware activation without machine reboot incl. limits of
   how much impact reset may have (e.g. dropping link or not).

 - Extend ethtool configuration interface to report IEEE-standard
   counters, to limit the need for per-vendor logic in user space.

 - Adopt or extend devlink use for debug, monitoring, fw update in many
   drivers (dsa loop, ice, ionic, sja1105, qed, mlxsw, mv88e6xxx,
   dpaa2-eth).

 - In mlxsw expose critical and emergency SFP module temperature alarms.
   Refactor port buffer handling to make the defaults more suitable and
   support setting these values explicitly via the DCBNL interface.

 - Add XDP support for Intel's igb driver.

 - Support offloading TC flower classification and filtering rules to
   mscc_ocelot switches.

 - Add PTP support for Marvell Octeontx2 and PP2.2 hardware, as well as
   fixed interval period pulse generator and one-step timestamping in
   dpaa-eth.

 - Add support for various auth offloads in WiFi APs, e.g. SAE (WPA3)
   offload.

 - Add Lynx PHY/PCS MDIO module, and convert various drivers which have
   this HW to use it. Convert mvpp2 to split PCS.

 - Support Marvell Prestera 98DX3255 24-port switch ASICs, as well as
   7-port Mediatek MT7531 IP.

 - Add initial support for QCA6390 and IPQ6018 in ath11k WiFi driver,
   and wcn3680 support in wcn36xx.

 - Improve performance for packets which don't require much offloads on
   recent Mellanox NICs by 20% by making multiple packets share a
   descriptor entry.

 - Move chelsio inline crypto drivers (for TLS and IPsec) from the
   crypto subtree to drivers/net. Move MDIO drivers out of the phy
   directory.

 - Clean up a lot of W=1 warnings, reportedly the actively developed
   subsections of networking drivers should now build W=1 warning free.

 - Make sure drivers don't use in_interrupt() to dynamically adapt their
   code. Convert tasklets to use new tasklet_setup API (sadly this
   conversion is not yet complete).

* tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2583 commits)
  Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH"
  net, sockmap: Don't call bpf_prog_put() on NULL pointer
  bpf, selftest: Fix flaky tcp_hdr_options test when adding addr to lo
  bpf, sockmap: Add locking annotations to iterator
  netfilter: nftables: allow re-computing sctp CRC-32C in 'payload' statements
  net: fix pos incrementment in ipv6_route_seq_next
  net/smc: fix invalid return code in smcd_new_buf_create()
  net/smc: fix valid DMBE buffer sizes
  net/smc: fix use-after-free of delayed events
  bpfilter: Fix build error with CONFIG_BPFILTER_UMH
  cxgb4/ch_ipsec: Replace the module name to ch_ipsec from chcr
  net: sched: Fix suspicious RCU usage while accessing tcf_tunnel_info
  bpf: Fix register equivalence tracking.
  rxrpc: Fix loss of final ack on shutdown
  rxrpc: Fix bundle counting for exclusive connections
  netfilter: restore NF_INET_NUMHOOKS
  ibmveth: Identify ingress large send packets.
  ibmveth: Switch order of ibmveth_helper calls.
  cxgb4: handle 4-tuple PEDIT to NAT mode translation
  selftests: Add VRF route leaking tests
  ...
2020-10-15 18:42:13 -07:00
Linus Torvalds 39a5101f98 Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu:
 "API:
   - Allow DRBG testing through user-space af_alg
   - Add tcrypt speed testing support for keyed hashes
   - Add type-safe init/exit hooks for ahash

  Algorithms:
   - Mark arc4 as obsolete and pending for future removal
   - Mark anubis, khazad, sead and tea as obsolete
   - Improve boot-time xor benchmark
   - Add OSCCA SM2 asymmetric cipher algorithm and use it for integrity

  Drivers:
   - Fixes and enhancement for XTS in caam
   - Add support for XIP8001B hwrng in xiphera-trng
   - Add RNG and hash support in sun8i-ce/sun8i-ss
   - Allow imx-rngc to be used by kernel entropy pool
   - Use crypto engine in omap-sham
   - Add support for Ingenic X1830 with ingenic"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (205 commits)
  X.509: Fix modular build of public_key_sm2
  crypto: xor - Remove unused variable count in do_xor_speed
  X.509: fix error return value on the failed path
  crypto: bcm - Verify GCM/CCM key length in setkey
  crypto: qat - drop input parameter from adf_enable_aer()
  crypto: qat - fix function parameters descriptions
  crypto: atmel-tdes - use semicolons rather than commas to separate statements
  crypto: drivers - use semicolons rather than commas to separate statements
  hwrng: mxc-rnga - use semicolons rather than commas to separate statements
  hwrng: iproc-rng200 - use semicolons rather than commas to separate statements
  hwrng: stm32 - use semicolons rather than commas to separate statements
  crypto: xor - use ktime for template benchmarking
  crypto: xor - defer load time benchmark to a later time
  crypto: hisilicon/zip - fix the uninitalized 'curr_qm_qp_num'
  crypto: hisilicon/zip - fix the return value when device is busy
  crypto: hisilicon/zip - fix zero length input in GZIP decompress
  crypto: hisilicon/zip - fix the uncleared debug registers
  lib/mpi: Fix unused variable warnings
  crypto: x86/poly1305 - Remove assignments with no effect
  hwrng: npcm - modify readl to readb
  ...
2020-10-13 08:50:16 -07:00
Linus Torvalds c90578360c Merge branch 'work.csum_and_copy' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull copy_and_csum cleanups from Al Viro:
 "Saner calling conventions for csum_and_copy_..._user() and friends"

[ Removing 800+ lines of code and cleaning stuff up is good  - Linus ]

* 'work.csum_and_copy' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ppc: propagate the calling conventions change down to csum_partial_copy_generic()
  amd64: switch csum_partial_copy_generic() to new calling conventions
  sparc64: propagate the calling convention changes down to __csum_partial_copy_...()
  xtensa: propagate the calling conventions change down into csum_partial_copy_generic()
  mips: propagate the calling convention change down into __csum_partial_copy_..._user()
  mips: __csum_partial_copy_kernel() has no users left
  mips: csum_and_copy_{to,from}_user() are never called under KERNEL_DS
  sparc32: propagate the calling conventions change down to __csum_partial_copy_sparc_generic()
  i386: propagate the calling conventions change down to csum_partial_copy_generic()
  sh: propage the calling conventions change down to csum_partial_copy_generic()
  m68k: get rid of zeroing destination on error in csum_and_copy_from_user()
  arm: propagate the calling convention changes down to csum_partial_copy_from_user()
  alpha: propagate the calling convention changes down to csum_partial_copy.c helpers
  saner calling conventions for csum_and_copy_..._user()
  csum_and_copy_..._user(): pass 0xffffffff instead of 0 as initial sum
  csum_partial_copy_nocheck(): drop the last argument
  unify generic instances of csum_partial_copy_nocheck()
  icmp_push_reply(): reorder adding the checksum up
  skb_copy_and_csum_bits(): don't bother with the last argument
2020-10-12 16:24:13 -07:00
Anna Schumaker e6ac0accb2 SUNRPC: Add an xdr_align_data() function
For now, this function simply aligns the data at the beginning of the
pages. This can eventually be expanded to shift data to the correct
offsets when we're ready.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:40 -04:00
Anna Schumaker 84ce182ab8 SUNRPC: Add the ability to expand holes in data pages
This patch adds the ability to "read a hole" into a set of XDR data
pages by taking the following steps:

1) Shift all data after the current xdr->p to the right, possibly into
   the tail,
2) Zero the specified range, and
3) Update xdr->p to point beyond the hole.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:39 -04:00
Anna Schumaker 43f0f0816c SUNRPC: Split out _shift_data_right_tail()
xdr_shrink_pagelen() is very similar to what we need for hole expansion,
so split out the common code into its own function that can be used by
both functions.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:39 -04:00
Anna Schumaker 06216ecbd9 SUNRPC: Split out xdr_realign_pages() from xdr_align_pages()
I don't need the entire align pages code for READ_PLUS, so split out the
part I do need so I don't need to reimplement anything.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:39 -04:00
Anna Schumaker cf1f08cac3 SUNRPC: Implement a xdr_page_pos() function
I'll need this for READ_PLUS to help figure out the offset where page
data is stored at, but it might also be useful for other things.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:39 -04:00
Anna Schumaker f7d61ee414 SUNRPC: Split out a function for setting current page
I'm going to need this bit of code in a few places for READ_PLUS
decoding, so let's make it a helper function.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-10-07 14:28:39 -04:00
David S. Miller 8b0308fe31 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Rejecting non-native endian BTF overlapped with the addition
of support for it.

The rest were more simple overlapping changes, except the
renesas ravb binding update, which had to follow a file
move as well as a YAML conversion.

Signed-off-by: David S. Miller <davem@davemloft.net>
2020-10-05 18:40:01 -07:00
J. Bruce Fields 0aa99c4d1f sunrpc: simplify do_cache_clean
Is it just me, or is the logic written in a slightly convoluted way?

I find it a little easier to read this way.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-09-25 18:02:02 -04:00
Xu Wang 9dbc1f45d5 sunrpc: cache : Replace seq_printf with seq_puts
seq_puts is a lot cheaper than seq_printf, so use that to print
literal strings.

Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-09-25 18:01:28 -04:00
Anna Schumaker 403217f304 SUNRPC/NFSD: Implement xdr_reserve_space_vec()
Reserving space for a large READ payload requires special handling when
reserving space in the xdr buffer pages. One problem we can have is use
of the scratch buffer, which is used to get a pointer to a contiguous
region of data up to PAGE_SIZE. When using the scratch buffer, calls to
xdr_commit_encode() shift the data to it's proper alignment in the xdr
buffer. If we've reserved several pages in a vector, then this could
potentially invalidate earlier pointers and result in incorrect READ
data being sent to the client.

I get around this by looking at the amount of space left in the current
page, and never reserve more than that for each entry in the read
vector. This lets us place data directly where it needs to go in the
buffer pages.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-09-25 18:01:27 -04:00
Randy Dunlap 1cc5213baa net: sunrpc: delete repeated words
Drop duplicate words in net/sunrpc/.
Also fix "Anyone" to be "Any one".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: linux-nfs@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-09-25 18:01:26 -04:00
David S. Miller 3ab0a7a0c3 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Two minor conflicts:

1) net/ipv4/route.c, adding a new local variable while
   moving another local variable and removing it's
   initial assignment.

2) drivers/net/dsa/microchip/ksz9477.c, overlapping changes.
   One pretty prints the port mode differently, whilst another
   changes the driver to try and obtain the port mode from
   the port node rather than the switch node.

Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-22 16:45:34 -07:00
Julia Lawall ed38c33f1c xprtrdma: drop double zeroing
sg_init_table zeroes its first argument, so the allocation of that argument
doesn't have to.

the semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,n,flags;
@@

x =
- kcalloc
+ kmalloc_array
  (n,sizeof(*x),flags)
...
sg_init_table(x,n)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 12:15:25 -04:00
Alexander A. Klimov 0bdd4cea12 Replace HTTP links with HTTPS ones: NFS, SUNRPC, and LOCKD clients
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
          If both the HTTP and HTTPS versions
          return 200 OK and serve the same content:
            Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:10 -04:00
Chuck Lever 5589cc4778 SUNRPC: Remove remaining dprintks from sched.c
Clean up.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 721a1d388b SUNRPC: Remove dprintk call sites in RPC queuing functions
Remove redundant call sites or call sites that are already covered
by tracepoints.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 1466c22163 SUNRPC: Clean up RPC scheduler tracepoints
Remove several redundant dprintk call sites, and replace a couple of
potentially useful ones with tracepoints.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever c3adcc7dfb SUNRPC: Replace rpcbind dprintk call sites with tracepoints
In many cases, tracepoints already report these errors. In others,
the dprintks were mainly useful when this code was less mature.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 1e664987a9 SUNRPC: Remove more dprintks in rpcb_clnt.c
Clean up: These are superfluous now that rpc_create() and friends
have tracepoints to report errors.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 15a798d6ce SUNRPC: Remove dprintk call sites in rpcbind XDR functions
Clean up: Other XDR functions no longer have dprintk call sites.
These were added during development and can be removed now that
the code is mature.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever ac1ae53421 SUNRPC: Hoist trace_xprtrdma_op_setport into generic code
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever e465cc3fa8 SUNRPC: Remove rpcb_getport_async dprintk call sites
In many cases, tracepoints already report these errors. In others,
the dprintks were mainly useful when this code was less mature.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 42ebfc2cbf SUNRPC: Clean up call_bind_status() observability
Time to remove dprintk call sites in here.

Regarding the rpc_bind_status tracepoint: It's friendlier to
administrators if they don't have to look up the error code to
figure out what went wrong. Replace trace_rpc_bind_status with a
set of tracepoints that report more specifically what the problem
was, and what RPC program/version was being queried.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever fd66e2a79d SUNRPC: Remove dprintk call site in call_decode
Clean up.

When enabled, this dprintk adds a line in /var/log/messages after
every RPC that reports the task ID (no connection to on the wire
XID values) and the RPC's result (no connection to the program,
operation, or the arguments and results).

Thus it's value is pretty low. Let's remove it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 7c8099f6ad SUNRPC: Trace call_refresh events
Clean up: Replace dprintk call sites.

Note that rpc_call_rpcerror() already has a trace point, so perhaps
adding trace_rpc_refresh_status() isn't necessary. However, it does
report a particular category of error.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 914cdcc78a SUNRPC: Add trace_rpc_timeout_status()
For a long while we've wanted a tracepoint that fires when a major
timeout is reported in the system log. Such a tracepoint can be
attached to other actions that can take place when a timeout is
detected (eg, server or connection health assessment).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 6f9f17287e SUNRPC: Mitigate cond_resched() in xprt_transmit()
The original purpose of this expensive call is to prevent a long
queue of requests from blocking other work.

The cond_resched() call is unnecessary after just a single send
operation.

For longer queues, instead of invoking the kernel scheduler, simply
release the transport send lock and return to the RPC scheduler.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever db0a86c426 SUNRPC: Replace connect dprintk call sites with a tracepoint
This trace event can be used to audit transport connections from the
client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 0ec36cc9cd SUNRPC: Remove dprintk call site in call_start()
Clean up: The rpc_rpc_request tracepoint serves the same purpose.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 6387039d6d SUNRPC: Remove the dprint_status() macro
Clean up: The rpc_task_run_action tracepoint serves the same
purpose.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:09 -04:00
Chuck Lever 015747d296 SUNRPC: Replace dprintk() call site in xs_nospace()
"no socket space" is an exceptional and infrequent condition
that troubleshooters want to know about.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever 9ce07ae5eb SUNRPC: Replace dprintk() call site in xprt_prepare_transmit
Generate a trace event when an RPC request is queued without being
sent immediately.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever 09d2ba0cb1 SUNRPC: Update debugging instrumentation in xprt_do_reserve()
Replace a dprintk() with a tracepoint. The tracepoint marks the
point where an RPC request is assigned an XID.

Additional clean up: Remove trace_xprt_enq_xmit, which reports much
the same thing. That tracepoint was added for debugging commit
918f3c1fe8 ("SUNRPC: Improve latency for interactive tasks").

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever 7806948753 SUNRPC: Remove debugging instrumentation from xprt_release
These instruments don't appear to add any substantial value.

We already have this at the termination of each RPC:

          iozone-2617  [002]   975.713126: rpc_stats_latency:    task:418@5 xid=0x260eab5d nfsv3 LOOKUP backlog=15 rtt=32 execute=58
          iozone-2617  [002]   975.713127: xprt_release_cong:    task:418@5 snd_task:4294967295 cong=256 cwnd=16384
          iozone-2617  [002]   975.713127: xprt_put_cong:        task:418@5 snd_task:4294967295 cong=0 cwnd=16384

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever 06e234c613 SUNRPC: Hoist trace_xprtrdma_op_allocate into generic code
Introduce a tracepoint in call_allocate that reports the exact
sizes in the RPC buffer allocation request and the status of the
result. This helps catch problems with XDR buffer provisioning,
and replaces transport-specific debugging instrumentation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever e4378a0fdd SUNRPC: Remove trace_xprt_complete_rqst()
Request completion is already recorded by an "rpc_task_wakeup
queue=xprt_pending" trace record. A subsequent rpc_xdr_recvfrom
trace record shows the number of bytes received.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Olga Kornievskaia 88428cc4ae SUNRPC dont update timeout value on connection reset
Current behaviour: every time a v3 operation is re-sent to the server
we update (double) the timeout. There is no distinction between whether
or not the previous timer had expired before the re-sent happened.

Here's the scenario:
1. Client sends a v3 operation
2. Server RST-s the connection (prior to the timeout) (eg., connection
is immediately reset)
3. Client re-sends a v3 operation but the timeout is now 120sec.

As a result, an application sees 2mins pause before a retry in case
server again does not reply. Where as if a connection reset didn't
change the timeout value, the client would have re-tried (the 3rd
time) after 60secs.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-21 10:21:08 -04:00
Chuck Lever 13a9a9d74d SUNRPC: Fix svc_flush_dcache()
On platforms that implement flush_dcache_page(), a large NFS WRITE
triggers the WARN_ONCE in bvec_iter_advance():

Sep 20 14:01:05 klimt.1015granger.net kernel: Attempted to advance past end of bvec iter
Sep 20 14:01:05 klimt.1015granger.net kernel: WARNING: CPU: 0 PID: 1032 at include/linux/bvec.h:101 bvec_iter_advance.isra.0+0xa7/0x158 [sunrpc]

Sep 20 14:01:05 klimt.1015granger.net kernel: Call Trace:
Sep 20 14:01:05 klimt.1015granger.net kernel:  svc_tcp_recvfrom+0x60c/0x12c7 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? bvec_iter_advance.isra.0+0x158/0x158 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? del_timer_sync+0x4b/0x55
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? test_bit+0x1d/0x27 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  svc_recv+0x1193/0x15e4 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? try_to_freeze.isra.0+0x6f/0x6f [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? refcount_sub_and_test.constprop.0+0x13/0x40 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? svc_xprt_put+0x1e/0x29f [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? svc_send+0x39f/0x3c1 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel:  nfsd+0x282/0x345 [nfsd]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? __kthread_parkme+0x74/0xba
Sep 20 14:01:05 klimt.1015granger.net kernel:  kthread+0x2ad/0x2bc
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? nfsd_destroy+0x124/0x124 [nfsd]
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? test_bit+0x1d/0x27
Sep 20 14:01:05 klimt.1015granger.net kernel:  ? kthread_mod_delayed_work+0x115/0x115
Sep 20 14:01:05 klimt.1015granger.net kernel:  ret_from_fork+0x22/0x30

Reported-by: He Zhe <zhe.he@windriver.com>
Fixes: ca07eda33e ("SUNRPC: Refactor svc_recvfrom()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-09-21 10:13:25 -04:00
Ard Biesheuvel e33d2a7b30 SUNRPC: remove RC4-HMAC-MD5 support from KerberosV
The RC4-HMAC-MD5 KerberosV algorithm is based on RFC 4757 [0], which
was specifically issued for interoperability with Windows 2000, but was
never intended to receive the same level of support. The RFC says

  The IETF Kerberos community supports publishing this specification as
  an informational document in order to describe this widely
  implemented technology.  However, while these encryption types
  provide the operations necessary to implement the base Kerberos
  specification [RFC4120], they do not provide all the required
  operations in the Kerberos cryptography framework [RFC3961].  As a
  result, it is not generally possible to implement potential
  extensions to Kerberos using these encryption types.  The Kerberos
  encryption type negotiation mechanism [RFC4537] provides one approach
  for using such extensions even when a Kerberos infrastructure uses
  long-term RC4 keys.  Because this specification does not implement
  operations required by RFC 3961 and because of security concerns with
  the use of RC4 and MD4 discussed in Section 8, this specification is
  not appropriate for publication on the standards track.

  The RC4-HMAC encryption types are used to ease upgrade of existing
  Windows NT environments, provide strong cryptography (128-bit key
  lengths), and provide exportable (meet United States government
  export restriction requirements) encryption.  This document describes
  the implementation of those encryption types.

Furthermore, this RFC was re-classified as 'historic' by RFC 8429 [1] in
2018, stating that 'none of the encryption types it specifies should be
used'

Note that other outdated algorithms are left in place (some of which are
guarded by CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES), so this should only
adversely affect interoperability with Windows NT/2000 systems that have
not received any updates since 2008 (but are connected to a network
nonetheless)

[0] https://tools.ietf.org/html/rfc4757
[1] https://tools.ietf.org/html/rfc8429

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-09-11 14:39:15 +10:00
Linus Torvalds ab29a807a7 NFS client bugfixes for Linux 5.9
Highlights include:
 
 Bugfixes:
 - Fix an NFS/RDMA resource leak
 - Fix the error handling during delegation recall
 - NFSv4.0 needs to return the delegation on a zero-stateid SETATTR
 - Stop printk reading past end of string
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Merge tag 'nfs-for-5.9-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:

 - Fix an NFS/RDMA resource leak

 - Fix the error handling during delegation recall

 - NFSv4.0 needs to return the delegation on a zero-stateid SETATTR

 - Stop printk reading past end of string

* tag 'nfs-for-5.9-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: stop printk reading past end of string
  NFS: Zero-stateid SETATTR should first return delegation
  NFSv4.1 handle ERR_DELAY error reclaiming locking state on delegation recall
  xprtrdma: Release in-flight MRs on disconnect
2020-09-09 11:14:20 -07:00
J. Bruce Fields 8c6b6c793e SUNRPC: stop printk reading past end of string
Since p points at raw xdr data, there's no guarantee that it's NULL
terminated, so we should give a length.  And probably escape any special
characters too.

Reported-by: Zhi Li <yieli@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-09-05 10:39:41 -04:00
Jakub Kicinski 44a8c4f33c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
We got slightly different patches removing a double word
in a comment in net/ipv4/raw.c - picked the version from net.

Simple conflict in drivers/net/ethernet/ibm/ibmvnic.c. Use cached
values instead of VNIC login response buffer (following what
commit 507ebe6444 ("ibmvnic: Fix use-after-free of VNIC login
response buffer") did).

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-09-04 21:28:59 -07:00
Chuck Lever 5de55ce951 xprtrdma: Release in-flight MRs on disconnect
Dan Aloni reports that when a server disconnects abruptly, a few
memory regions are left DMA mapped. Over time this leak could pin
enough I/O resources to slow or even deadlock an NFS/RDMA client.

I found that if a transport disconnects before pending Send and
FastReg WRs can be posted, the to-be-registered MRs are stranded on
the req's rl_registered list and never released -- since they
weren't posted, there's no Send completion to DMA unmap them.

Reported-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-08-26 15:29:21 -04:00
Linus Torvalds 2ac69819ba Fixes:
- Eliminate an oops introduced in v5.8
 - Remove a duplicate #include added by nfsd-5.9
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Merge tag 'nfsd-5.9-1' of git://git.linux-nfs.org/projects/cel/cel-2.6

Pull nfs server fixes from Chuck Lever:

 - Eliminate an oops introduced in v5.8

 - Remove a duplicate #include added by nfsd-5.9

* tag 'nfsd-5.9-1' of git://git.linux-nfs.org/projects/cel/cel-2.6:
  SUNRPC: remove duplicate include
  nfsd: fix oops on mixed NFSv4/NFSv3 client access
2020-08-25 18:01:36 -07:00
Joe Perches ca65a280fb sunrpc: Avoid comma separated statements
Use semicolons and braces.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-25 07:54:19 -07:00
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00
Al Viro 8d5930dfb7 skb_copy_and_csum_bits(): don't bother with the last argument
it's always 0

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-08-20 15:45:13 -04:00
Wang Hai ad112aa8b1 SUNRPC: remove duplicate include
Remove linux/sunrpc/auth_gss.h which is included more than once

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-08-19 13:19:42 -04:00
Linus Torvalds 37711e5e23 NFS client updates for Linux 5.9
Highlights include:
 
 Stable fixes:
 - pNFS: Don't return layout segments that are being used for I/O
 - pNFS: Don't move layout segments off the active list when being used for I/O
 
 Features:
 - NFS: Add support for user xattrs through the NFSv4.2 protocol
 - NFS: Allow applications to speed up readdir+statx() using AT_STATX_DONT_SYNC
 - NFSv4.0 allow nconnect for v4.0
 
 Bugfixes and cleanups:
 - nfs: ensure correct writeback errors are returned on close()
 - nfs: nfs_file_write() should check for writeback errors
 - nfs: Fix getxattr kernel panic and memory overflow
 - NFS: Fix the pNFS/flexfiles mirrored read failover code
 - SUNRPC: dont update timeout value on connection reset
 - freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS
 - sunrpc: destroy rpc_inode_cachep after unregister_filesystem
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Merge tag 'nfs-for-5.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Stable fixes:
   - pNFS: Don't return layout segments that are being used for I/O
   - pNFS: Don't move layout segments off the active list when being used for I/O

  Features:
   - NFS: Add support for user xattrs through the NFSv4.2 protocol
   - NFS: Allow applications to speed up readdir+statx() using AT_STATX_DONT_SYNC
   - NFSv4.0 allow nconnect for v4.0

  Bugfixes and cleanups:
   - nfs: ensure correct writeback errors are returned on close()
   - nfs: nfs_file_write() should check for writeback errors
   - nfs: Fix getxattr kernel panic and memory overflow
   - NFS: Fix the pNFS/flexfiles mirrored read failover code
   - SUNRPC: dont update timeout value on connection reset
   - freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS
   - sunrpc: destroy rpc_inode_cachep after unregister_filesystem"

* tag 'nfs-for-5.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (32 commits)
  NFS: Fix flexfiles read failover
  fs: nfs: delete repeated words in comments
  rpc_pipefs: convert comma to semicolon
  nfs: Fix getxattr kernel panic and memory overflow
  NFS: Don't return layout segments that are in use
  NFS: Don't move layouts to plh_return_segs list while in use
  NFS: Add layout segment info to pnfs read/write/commit tracepoints
  NFS: Add tracepoints for layouterror and layoutstats.
  NFS: Report the stateid + status in trace_nfs4_layoutreturn_on_close()
  SUNRPC dont update timeout value on connection reset
  nfs: nfs_file_write() should check for writeback errors
  nfs: ensure correct writeback errors are returned on close()
  NFSv4.2: xattr cache: get rid of cache discard work queue
  NFS: remove redundant initialization of variable result
  NFSv4.0 allow nconnect for v4.0
  freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS
  sunrpc: destroy rpc_inode_cachep after unregister_filesystem
  NFSv4.2: add client side xattr caching.
  NFSv4.2: hook in the user extended attribute handlers
  NFSv4.2: add the extended attribute proc functions.
  ...
2020-08-15 08:26:55 -07:00
Linus Torvalds 7a6b60441f Highlights:
- Support for user extended attributes on NFS (RFC 8276)
 - Further reduce unnecessary NFSv4 delegation recalls
 
 Notable fixes:
 
 - Fix recent krb5p regression
 - Address a few resource leaks and a rare NULL dereference
 
 Other:
 
 - De-duplicate RPC/RDMA error handling and other utility functions
 - Replace storage and display of kernel memory addresses by tracepoints
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Merge tag 'nfsd-5.9' of git://git.linux-nfs.org/projects/cel/cel-2.6

Pull NFS server updates from Chuck Lever:
 "Highlights:
   - Support for user extended attributes on NFS (RFC 8276)
   - Further reduce unnecessary NFSv4 delegation recalls

  Notable fixes:
   - Fix recent krb5p regression
   - Address a few resource leaks and a rare NULL dereference

  Other:
   - De-duplicate RPC/RDMA error handling and other utility functions
   - Replace storage and display of kernel memory addresses by tracepoints"

* tag 'nfsd-5.9' of git://git.linux-nfs.org/projects/cel/cel-2.6: (38 commits)
  svcrdma: CM event handler clean up
  svcrdma: Remove transport reference counting
  svcrdma: Fix another Receive buffer leak
  SUNRPC: Refresh the show_rqstp_flags() macro
  nfsd: netns.h: delete a duplicated word
  SUNRPC: Fix ("SUNRPC: Add "@len" parameter to gss_unwrap()")
  nfsd: avoid a NULL dereference in __cld_pipe_upcall()
  nfsd4: a client's own opens needn't prevent delegations
  nfsd: Use seq_putc() in two functions
  svcrdma: Display chunk completion ID when posting a rw_ctxt
  svcrdma: Record send_ctxt completion ID in trace_svcrdma_post_send()
  svcrdma: Introduce Send completion IDs
  svcrdma: Record Receive completion ID in svc_rdma_decode_rqst
  svcrdma: Introduce Receive completion IDs
  svcrdma: Introduce infrastructure to support completion IDs
  svcrdma: Add common XDR encoders for RDMA and Read segments
  svcrdma: Add common XDR decoders for RDMA and Read segments
  SUNRPC: Add helpers for decoding list discriminators symbolically
  svcrdma: Remove declarations for functions long removed
  svcrdma: Clean up trace_svcrdma_send_failed() tracepoint
  ...
2020-08-09 13:58:04 -07:00
Waiman Long 453431a549 mm, treewide: rename kzfree() to kfree_sensitive()
As said by Linus:

  A symmetric naming is only helpful if it implies symmetries in use.
  Otherwise it's actively misleading.

  In "kzalloc()", the z is meaningful and an important part of what the
  caller wants.

  In "kzfree()", the z is actively detrimental, because maybe in the
  future we really _might_ want to use that "memfill(0xdeadbeef)" or
  something. The "zero" part of the interface isn't even _relevant_.

The main reason that kzfree() exists is to clear sensitive information
that should not be leaked to other future users of the same memory
objects.

Rename kzfree() to kfree_sensitive() to follow the example of the recently
added kvfree_sensitive() and make the intention of the API more explicit.
In addition, memzero_explicit() is used to clear the memory to make sure
that it won't get optimized away by the compiler.

The renaming is done by using the command sequence:

  git grep -w --name-only kzfree |\
  xargs sed -i 's/kzfree/kfree_sensitive/'

followed by some editing of the kfree_sensitive() kerneldoc and adding
a kzfree backward compatibility macro in slab.h.

[akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h]
[akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more]

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Joe Perches <joe@perches.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Jason A . Donenfeld" <Jason@zx2c4.com>
Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-08-07 11:33:22 -07:00
Olga Kornievskaia 7de62bc09f SUNRPC dont update timeout value on connection reset
Current behaviour: every time a v3 operation is re-sent to the server
we update (double) the timeout. There is no distinction between whether
or not the previous timer had expired before the re-sent happened.

Here's the scenario:
1. Client sends a v3 operation
2. Server RST-s the connection (prior to the timeout) (eg., connection
is immediately reset)
3. Client re-sends a v3 operation but the timeout is now 120sec.

As a result, an application sees 2mins pause before a retry in case
server again does not reply.

Instead, this patch proposes to keep track off when the minor timeout
should happen and if it didn't, then don't update the new timeout.
Value is updated based on the previous value to make timeouts
predictable.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-08-04 23:17:11 -04:00
Linus Torvalds 99ea1521a0 Remove uninitialized_var() macro for v5.9-rc1
- Clean up non-trivial uses of uninitialized_var()
 - Update documentation and checkpatch for uninitialized_var() removal
 - Treewide removal of uninitialized_var()
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Merge tag 'uninit-macro-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull uninitialized_var() macro removal from Kees Cook:
 "This is long overdue, and has hidden too many bugs over the years. The
  series has several "by hand" fixes, and then a trivial treewide
  replacement.

   - Clean up non-trivial uses of uninitialized_var()

   - Update documentation and checkpatch for uninitialized_var() removal

   - Treewide removal of uninitialized_var()"

* tag 'uninit-macro-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  compiler: Remove uninitialized_var() macro
  treewide: Remove uninitialized_var() usage
  checkpatch: Remove awareness of uninitialized_var() macro
  mm/debug_vm_pgtable: Remove uninitialized_var() usage
  f2fs: Eliminate usage of uninitialized_var() macro
  media: sur40: Remove uninitialized_var() usage
  KVM: PPC: Book3S PR: Remove uninitialized_var() usage
  clk: spear: Remove uninitialized_var() usage
  clk: st: Remove uninitialized_var() usage
  spi: davinci: Remove uninitialized_var() usage
  ide: Remove uninitialized_var() usage
  rtlwifi: rtl8192cu: Remove uninitialized_var() usage
  b43: Remove uninitialized_var() usage
  drbd: Remove uninitialized_var() usage
  x86/mm/numa: Remove uninitialized_var() usage
  docs: deprecated.rst: Add uninitialized_var()
2020-08-04 13:49:43 -07:00
Chuck Lever b297fed699 svcrdma: CM event handler clean up
Now that there's a core tracepoint that reports these events, there's
no need to maintain dprintk() call sites in each arm of the switch
statements.

We also refresh the documenting comments.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-07-28 10:18:15 -04:00
Chuck Lever 365e9992b9 svcrdma: Remove transport reference counting
Jason tells me that a ULP cannot rely on getting an ESTABLISHED
and DISCONNECTED event pair for each connection, so transport
reference counting in the CM event handler will never be reliable.

Now that we have ib_drain_qp(), svcrdma should no longer need to
hold transport references while Sends and Receives are posted. So
remove the get/put call sites in the CM event handlers.

This eliminates a significant source of locked memory bus traffic.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-07-28 10:18:14 -04:00