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linux-sg2042/include/linux/sunrpc/svc_rdma.h

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rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
/*
* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the BSD-type
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the Network Appliance, Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author: Tom Tucker <tom@opengridcomputing.com>
*/
#ifndef SVC_RDMA_H
#define SVC_RDMA_H
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#define SVCRDMA_DEBUG
/* RPC/RDMA parameters and stats */
extern unsigned int svcrdma_ord;
extern unsigned int svcrdma_max_requests;
extern unsigned int svcrdma_max_req_size;
extern atomic_t rdma_stat_recv;
extern atomic_t rdma_stat_read;
extern atomic_t rdma_stat_write;
extern atomic_t rdma_stat_sq_starve;
extern atomic_t rdma_stat_rq_starve;
extern atomic_t rdma_stat_rq_poll;
extern atomic_t rdma_stat_rq_prod;
extern atomic_t rdma_stat_sq_poll;
extern atomic_t rdma_stat_sq_prod;
#define RPCRDMA_VERSION 1
/*
* Contexts are built when an RDMA request is created and are a
* record of the resources that can be recovered when the request
* completes.
*/
struct svc_rdma_op_ctxt {
svcrdma: Simplify RDMA_READ deferral buffer management An NFS_WRITE requires a set of RDMA_READ requests to fetch the write data from the client. There are two principal pieces of data that need to be tracked: the list of pages that comprise the completed RPC and the SGE of dma mapped pages to refer to this list of pages. Previously this whole bit was managed as a linked list of contexts with the context containing the page list buried in this list. This patch simplifies this processing by not keeping a linked list, but rather only a pionter from the last submitted RDMA_READ's context to the context that maps the set of pages that describe the RPC. This significantly simplifies this code path. SGE contexts are cleaned up inline in the DTO path instead of at read completion time. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-01 08:50:56 +08:00
struct svc_rdma_op_ctxt *read_hdr;
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
struct svc_rdma_fastreg_mr *frmr;
svcrdma: Use reply and chunk map for RDMA_READ processing Modify the RDMA_READ processing to use the reply and chunk list mapping data types. Also add a special purpose 'hdr_count' field in in the context to hold the header page count instead of overloading the SGE length field and corrupting the DMA map length. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-28 06:03:14 +08:00
int hdr_count;
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
struct xdr_buf arg;
struct list_head dto_q;
enum ib_wr_opcode wr_op;
enum ib_wc_status wc_status;
u32 byte_len;
struct svcxprt_rdma *xprt;
unsigned long flags;
enum dma_data_direction direction;
int count;
struct ib_sge sge[RPCSVC_MAXPAGES];
struct page *pages[RPCSVC_MAXPAGES];
};
svcrdma: Add a type for keeping NFS RPC mapping Create a new data structure to hold the remote client address space to local server address space mapping. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-29 02:54:04 +08:00
/*
* NFS_ requests are mapped on the client side by the chunk lists in
* the RPCRDMA header. During the fetching of the RPC from the client
* and the writing of the reply to the client, the memory in the
* client and the memory in the server must be mapped as contiguous
* vaddr/len for access by the hardware. These data strucures keep
* these mappings.
*
* For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
* 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
* 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
* mapping of the reply.
*/
struct svc_rdma_chunk_sge {
int start; /* sge no for this chunk */
int count; /* sge count for this chunk */
};
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
struct svc_rdma_fastreg_mr {
struct ib_mr *mr;
void *kva;
struct ib_fast_reg_page_list *page_list;
int page_list_len;
unsigned long access_flags;
unsigned long map_len;
enum dma_data_direction direction;
struct list_head frmr_list;
};
svcrdma: Add a type for keeping NFS RPC mapping Create a new data structure to hold the remote client address space to local server address space mapping. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-29 02:54:04 +08:00
struct svc_rdma_req_map {
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
struct svc_rdma_fastreg_mr *frmr;
svcrdma: Add a type for keeping NFS RPC mapping Create a new data structure to hold the remote client address space to local server address space mapping. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-29 02:54:04 +08:00
unsigned long count;
union {
struct kvec sge[RPCSVC_MAXPAGES];
struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
};
};
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
#define RDMACTXT_F_FAST_UNREG 1
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
#define RDMACTXT_F_LAST_CTXT 2
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
#define SVCRDMA_DEVCAP_FAST_REG 1 /* fast mr registration */
#define SVCRDMA_DEVCAP_READ_W_INV 2 /* read w/ invalidate */
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
struct svcxprt_rdma {
struct svc_xprt sc_xprt; /* SVC transport structure */
struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
struct list_head sc_accept_q; /* Conn. waiting accept */
int sc_ord; /* RDMA read limit */
int sc_max_sge;
int sc_sq_depth; /* Depth of SQ */
atomic_t sc_sq_count; /* Number of SQ WR on queue */
int sc_max_requests; /* Depth of RQ */
int sc_max_req_size; /* Size of each RQ WR buf */
struct ib_pd *sc_pd;
svcrdma: Add dma map count and WARN_ON Add a dma map count in order to verify that all DMA mapping resources have been freed when the transport is closed. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-29 02:17:44 +08:00
atomic_t sc_dma_used;
svcrdma: Use standard Linux lists for context cache Replace the one-off linked list implementation used to implement the context cache with the standard Linux list_head lists. Add a context counter to catch resource leaks. A WARN_ON will be added later to ensure that we've freed all contexts. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-01 09:44:39 +08:00
atomic_t sc_ctxt_used;
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
struct list_head sc_rq_dto_q;
spinlock_t sc_rq_dto_lock;
struct ib_qp *sc_qp;
struct ib_cq *sc_rq_cq;
struct ib_cq *sc_sq_cq;
struct ib_mr *sc_phys_mr; /* MR for server memory */
svcrdma: Add Fast Reg MR Data Types Add data types to track Fast Reg Memory Regions. The core data type is svc_rdma_fastreg_mr that associates a device MR with a host kva and page list. A field is added to the WR context to keep track of the FRMR used to map the local memory for an RPC. An FRMR list and spin lock are added to the transport instance to keep track of all FRMR allocated for the transport. Also added are device capability flags to indicate what the memory registration capabilities are for the underlying device and whether or not fast memory registration is supported. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-01 02:06:13 +08:00
u32 sc_dev_caps; /* distilled device caps */
u32 sc_dma_lkey; /* local dma key */
unsigned int sc_frmr_pg_list_len;
struct list_head sc_frmr_q;
spinlock_t sc_frmr_q_lock;
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
spinlock_t sc_lock; /* transport lock */
wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
unsigned long sc_flags;
struct list_head sc_dto_q; /* DTO tasklet I/O pending Q */
struct list_head sc_read_complete_q;
svcrdma: Move destroy to kernel thread Some providers may wait while destroying adapter resources. Since it is possible that the last reference is put on the dto_tasklet, the actual destroy must be scheduled as a work item. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-01 11:00:46 +08:00
struct work_struct sc_work;
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
};
/* sc_flags */
#define RDMAXPRT_RQ_PENDING 1
#define RDMAXPRT_SQ_PENDING 2
#define RDMAXPRT_CONN_PENDING 3
#define RPCRDMA_LISTEN_BACKLOG 10
/* The default ORD value is based on two outstanding full-size writes with a
* page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */
#define RPCRDMA_ORD (64/4)
#define RPCRDMA_SQ_DEPTH_MULT 8
#define RPCRDMA_MAX_THREADS 16
#define RPCRDMA_MAX_REQUESTS 16
#define RPCRDMA_MAX_REQ_SIZE 4096
/* svc_rdma_marshal.c */
extern void svc_rdma_rcl_chunk_counts(struct rpcrdma_read_chunk *,
int *, int *);
extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *);
extern int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *);
extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
struct rpcrdma_msg *,
enum rpcrdma_errcode, u32 *);
extern void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *, int);
extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
u32, u64, u32);
extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
struct rpcrdma_msg *,
struct rpcrdma_msg *,
enum rpcrdma_proc);
extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
/* svc_rdma_recvfrom.c */
extern int svc_rdma_recvfrom(struct svc_rqst *);
/* svc_rdma_sendto.c */
extern int svc_rdma_sendto(struct svc_rqst *);
/* svc_rdma_transport.c */
extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
svcrdma: Change svc_rdma_send_error return type to void The svc_rdma_send_error function is called when an RPCRDMA protocol error is detected. This function attempts to post an error reply message. Since an error posting to a transport in error is ignored, change the return type to void. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-08 04:47:42 +08:00
extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
enum rpcrdma_errcode);
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
struct page *svc_rdma_get_page(void);
extern int svc_rdma_post_recv(struct svcxprt_rdma *);
extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
svcrdma: Modify the RPC recv path to use FRMR when available RPCRDMA requests that specify a read-list are fetched with RDMA_READ. Using an FRMR to map the data sink improves NFSRDMA security on transports that place the RDMA_READ data sink LKEY on the wire because the valid lifetime of the MR is only the duration of the RDMA_READ. The LKEY is invalidated when the last RDMA_READ WR completes. Mapping the data sink also allows for very large amounts to data to be fetched with a single WR, so if the client is also using FRMR, the entire RPC read-list can be fetched with a single WR. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-08-13 04:12:10 +08:00
extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
svcrdma: Add a type for keeping NFS RPC mapping Create a new data structure to hold the remote client address space to local server address space mapping. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-29 02:54:04 +08:00
extern struct svc_rdma_req_map *svc_rdma_get_req_map(void);
extern void svc_rdma_put_req_map(struct svc_rdma_req_map *);
svcrdma: Add a service to register a Fast Reg MR with the device Fast Reg MR introduces a new WR type. Add a service to register the region with the adapter and update the completion handling to support completions with a NULL WR context. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-04 04:22:18 +08:00
extern int svc_rdma_fastreg(struct svcxprt_rdma *, struct svc_rdma_fastreg_mr *);
svcrdma: Add FRMR get/put services Add services for the allocating, freeing, and unmapping Fast Reg MR. These services will be used by the transport connection setup, send and receive routines. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-07 03:45:18 +08:00
extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
struct svc_rdma_fastreg_mr *);
rdma: SVCRMDA Header File This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2007-12-13 06:13:17 +08:00
extern void svc_sq_reap(struct svcxprt_rdma *);
extern void svc_rq_reap(struct svcxprt_rdma *);
extern struct svc_xprt_class svc_rdma_class;
extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
/* svc_rdma.c */
extern int svc_rdma_init(void);
extern void svc_rdma_cleanup(void);
/*
* Returns the address of the first read chunk or <nul> if no read chunk is
* present
*/
static inline struct rpcrdma_read_chunk *
svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
{
struct rpcrdma_read_chunk *ch =
(struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
if (ch->rc_discrim == 0)
return NULL;
return ch;
}
/*
* Returns the address of the first read write array element or <nul> if no
* write array list is present
*/
static inline struct rpcrdma_write_array *
svc_rdma_get_write_array(struct rpcrdma_msg *rmsgp)
{
if (rmsgp->rm_body.rm_chunks[0] != 0
|| rmsgp->rm_body.rm_chunks[1] == 0)
return NULL;
return (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[1];
}
/*
* Returns the address of the first reply array element or <nul> if no
* reply array is present
*/
static inline struct rpcrdma_write_array *
svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp)
{
struct rpcrdma_read_chunk *rch;
struct rpcrdma_write_array *wr_ary;
struct rpcrdma_write_array *rp_ary;
/* XXX: Need to fix when reply list may occur with read-list and/or
* write list */
if (rmsgp->rm_body.rm_chunks[0] != 0 ||
rmsgp->rm_body.rm_chunks[1] != 0)
return NULL;
rch = svc_rdma_get_read_chunk(rmsgp);
if (rch) {
while (rch->rc_discrim)
rch++;
/* The reply list follows an empty write array located
* at 'rc_position' here. The reply array is at rc_target.
*/
rp_ary = (struct rpcrdma_write_array *)&rch->rc_target;
goto found_it;
}
wr_ary = svc_rdma_get_write_array(rmsgp);
if (wr_ary) {
rp_ary = (struct rpcrdma_write_array *)
&wr_ary->
wc_array[wr_ary->wc_nchunks].wc_target.rs_length;
goto found_it;
}
/* No read list, no write list */
rp_ary = (struct rpcrdma_write_array *)
&rmsgp->rm_body.rm_chunks[2];
found_it:
if (rp_ary->wc_discrim == 0)
return NULL;
return rp_ary;
}
#endif