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svcrdma: Trace key RPC/RDMA protocol events 

This includes:
  * Transport accept and tear-down
  * Decisions about using Write and Reply chunks
  * Each RDMA segment that is handled
  * Whenever an RDMA_ERR is sent

As a clean-up, I've standardized the order of the includes, and
removed some now redundant dprintk call sites.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2018-05-07 15:27:11 -04:00 committed by J. Bruce Fields
parent b6e717cbf2
commit 98895edbe3
5 changed files with 311 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

262
include/trace/events/rpcrdma.h
View File

@ -1,6 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2017 Oracle. All rights reserved.
* Copyright (c) 2017, 2018 Oracle. All rights reserved.
*
* Trace point definitions for the "rpcrdma" subsystem.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rpcrdma
@ -885,6 +887,264 @@ TRACE_EVENT(xprtrdma_cb_setup,
DEFINE_CB_EVENT(xprtrdma_cb_call);
DEFINE_CB_EVENT(xprtrdma_cb_reply);
/**
** Server-side RPC/RDMA events
**/
DECLARE_EVENT_CLASS(svcrdma_xprt_event,
TP_PROTO(
const struct svc_xprt *xprt
),
TP_ARGS(xprt),
TP_STRUCT__entry(
__field(const void *, xprt)
__string(addr, xprt->xpt_remotebuf)
),
TP_fast_assign(
__entry->xprt = xprt;
__assign_str(addr, xprt->xpt_remotebuf);
),
TP_printk("xprt=%p addr=%s",
__entry->xprt, __get_str(addr)
)
);
#define DEFINE_XPRT_EVENT(name) \
DEFINE_EVENT(svcrdma_xprt_event, svcrdma_xprt_##name, \
TP_PROTO( \
const struct svc_xprt *xprt \
), \
TP_ARGS(xprt))
DEFINE_XPRT_EVENT(accept);
DEFINE_XPRT_EVENT(fail);
DEFINE_XPRT_EVENT(free);
TRACE_DEFINE_ENUM(RDMA_MSG);
TRACE_DEFINE_ENUM(RDMA_NOMSG);
TRACE_DEFINE_ENUM(RDMA_MSGP);
TRACE_DEFINE_ENUM(RDMA_DONE);
TRACE_DEFINE_ENUM(RDMA_ERROR);
#define show_rpcrdma_proc(x) \
__print_symbolic(x, \
{ RDMA_MSG, "RDMA_MSG" }, \
{ RDMA_NOMSG, "RDMA_NOMSG" }, \
{ RDMA_MSGP, "RDMA_MSGP" }, \
{ RDMA_DONE, "RDMA_DONE" }, \
{ RDMA_ERROR, "RDMA_ERROR" })
TRACE_EVENT(svcrdma_decode_rqst,
TP_PROTO(
__be32 *p,
unsigned int hdrlen
),
TP_ARGS(p, hdrlen),
TP_STRUCT__entry(
__field(u32, xid)
__field(u32, vers)
__field(u32, proc)
__field(u32, credits)
__field(unsigned int, hdrlen)
),
TP_fast_assign(
__entry->xid = be32_to_cpup(p++);
__entry->vers = be32_to_cpup(p++);
__entry->credits = be32_to_cpup(p++);
__entry->proc = be32_to_cpup(p);
__entry->hdrlen = hdrlen;
),
TP_printk("xid=0x%08x vers=%u credits=%u proc=%s hdrlen=%u",
__entry->xid, __entry->vers, __entry->credits,
show_rpcrdma_proc(__entry->proc), __entry->hdrlen)
);
TRACE_EVENT(svcrdma_decode_short,
TP_PROTO(
unsigned int hdrlen
),
TP_ARGS(hdrlen),
TP_STRUCT__entry(
__field(unsigned int, hdrlen)
),
TP_fast_assign(
__entry->hdrlen = hdrlen;
),
TP_printk("hdrlen=%u", __entry->hdrlen)
);
DECLARE_EVENT_CLASS(svcrdma_badreq_event,
TP_PROTO(
__be32 *p
),
TP_ARGS(p),
TP_STRUCT__entry(
__field(u32, xid)
__field(u32, vers)
__field(u32, proc)
__field(u32, credits)
),
TP_fast_assign(
__entry->xid = be32_to_cpup(p++);
__entry->vers = be32_to_cpup(p++);
__entry->credits = be32_to_cpup(p++);
__entry->proc = be32_to_cpup(p);
),
TP_printk("xid=0x%08x vers=%u credits=%u proc=%u",
__entry->xid, __entry->vers, __entry->credits, __entry->proc)
);
#define DEFINE_BADREQ_EVENT(name) \
DEFINE_EVENT(svcrdma_badreq_event, svcrdma_decode_##name,\
TP_PROTO( \
__be32 *p \
), \
TP_ARGS(p))
DEFINE_BADREQ_EVENT(badvers);
DEFINE_BADREQ_EVENT(drop);
DEFINE_BADREQ_EVENT(badproc);
DEFINE_BADREQ_EVENT(parse);
DECLARE_EVENT_CLASS(svcrdma_segment_event,
TP_PROTO(
u32 handle,
u32 length,
u64 offset
),
TP_ARGS(handle, length, offset),
TP_STRUCT__entry(
__field(u32, handle)
__field(u32, length)
__field(u64, offset)
),
TP_fast_assign(
__entry->handle = handle;
__entry->length = length;
__entry->offset = offset;
),
TP_printk("%u@0x%016llx:0x%08x",
__entry->length, (unsigned long long)__entry->offset,
__entry->handle
)
);
#define DEFINE_SEGMENT_EVENT(name) \
DEFINE_EVENT(svcrdma_segment_event, svcrdma_encode_##name,\
TP_PROTO( \
u32 handle, \
u32 length, \
u64 offset \
), \
TP_ARGS(handle, length, offset))
DEFINE_SEGMENT_EVENT(rseg);
DEFINE_SEGMENT_EVENT(wseg);
DECLARE_EVENT_CLASS(svcrdma_chunk_event,
TP_PROTO(
u32 length
),
TP_ARGS(length),
TP_STRUCT__entry(
__field(u32, length)
),
TP_fast_assign(
__entry->length = length;
),
TP_printk("length=%u",
__entry->length
)
);
#define DEFINE_CHUNK_EVENT(name) \
DEFINE_EVENT(svcrdma_chunk_event, svcrdma_encode_##name,\
TP_PROTO( \
u32 length \
), \
TP_ARGS(length))
DEFINE_CHUNK_EVENT(pzr);
DEFINE_CHUNK_EVENT(write);
DEFINE_CHUNK_EVENT(reply);
TRACE_EVENT(svcrdma_encode_read,
TP_PROTO(
u32 length,
u32 position
),
TP_ARGS(length, position),
TP_STRUCT__entry(
__field(u32, length)
__field(u32, position)
),
TP_fast_assign(
__entry->length = length;
__entry->position = position;
),
TP_printk("length=%u position=%u",
__entry->length, __entry->position
)
);
DECLARE_EVENT_CLASS(svcrdma_error_event,
TP_PROTO(
__be32 xid
),
TP_ARGS(xid),
TP_STRUCT__entry(
__field(u32, xid)
),
TP_fast_assign(
__entry->xid = be32_to_cpu(xid);
),
TP_printk("xid=0x%08x",
__entry->xid
)
);
#define DEFINE_ERROR_EVENT(name) \
DEFINE_EVENT(svcrdma_error_event, svcrdma_err_##name, \
TP_PROTO( \
__be32 xid \
), \
TP_ARGS(xid))
DEFINE_ERROR_EVENT(vers);
DEFINE_ERROR_EVENT(chunk);
#endif /* _TRACE_RPCRDMA_H */
#include <trace/define_trace.h>

36
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@ -93,17 +93,19 @@
* (see rdma_read_complete() below).
*/
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <linux/spinlock.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/sunrpc/svc_rdma.h>
#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
/*
@ -295,7 +297,6 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
{
__be32 *p, *end, *rdma_argp;
unsigned int hdr_len;
char *proc;
/* Verify that there's enough bytes for header + something */
if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
@ -307,10 +308,8 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
switch (*(rdma_argp + 3)) {
case rdma_msg:
proc = "RDMA_MSG";
break;
case rdma_nomsg:
proc = "RDMA_NOMSG";
break;
case rdma_done:
@ -340,30 +339,27 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
rq_arg->head[0].iov_len -= hdr_len;
rq_arg->len -= hdr_len;
dprintk("svcrdma: received %s request for XID 0x%08x, hdr_len=%u\n",
proc, be32_to_cpup(rdma_argp), hdr_len);
trace_svcrdma_decode_rqst(rdma_argp, hdr_len);
return hdr_len;
out_short:
dprintk("svcrdma: header too short = %d\n", rq_arg->len);
trace_svcrdma_decode_short(rq_arg->len);
return -EINVAL;
out_version:
dprintk("svcrdma: bad xprt version: %u\n",
be32_to_cpup(rdma_argp + 1));
trace_svcrdma_decode_badvers(rdma_argp);
return -EPROTONOSUPPORT;
out_drop:
dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n");
trace_svcrdma_decode_drop(rdma_argp);
return 0;
out_proc:
dprintk("svcrdma: bad rdma procedure (%u)\n",
be32_to_cpup(rdma_argp + 3));
trace_svcrdma_decode_badproc(rdma_argp);
return -EINVAL;
out_inval:
dprintk("svcrdma: failed to parse transport header\n");
trace_svcrdma_decode_parse(rdma_argp);
return -EINVAL;
}
@ -412,12 +408,16 @@ static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
*p++ = *(rdma_argp + 1);
*p++ = xprt->sc_fc_credits;
*p++ = rdma_error;
if (status == -EPROTONOSUPPORT) {
switch (status) {
case -EPROTONOSUPPORT:
*p++ = err_vers;
*p++ = rpcrdma_version;
*p++ = rpcrdma_version;
} else {
trace_svcrdma_err_vers(*rdma_argp);
break;
default:
*p++ = err_chunk;
trace_svcrdma_err_chunk(*rdma_argp);
}
length = (unsigned long)p - (unsigned long)err_msgp;
@ -532,8 +532,6 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
}
spin_unlock(&rdma_xprt->sc_rq_dto_lock);
dprintk("svcrdma: recvfrom: ctxt=%p on xprt=%p, rqstp=%p\n",
ctxt, rdma_xprt, rqstp);
atomic_inc(&rdma_stat_recv);
svc_rdma_build_arg_xdr(rqstp, ctxt);
@ -559,8 +557,6 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
complete:
svc_rdma_put_context(ctxt, 0);
dprintk("svcrdma: recvfrom: xprt=%p, rqstp=%p, rq_arg.len=%u\n",
rdma_xprt, rqstp, rqstp->rq_arg.len);
rqstp->rq_prot = IPPROTO_MAX;
svc_xprt_copy_addrs(rqstp, xprt);
return rqstp->rq_arg.len;

23
net/sunrpc/xprtrdma/svc_rdma_rw.c
View File

@ -5,11 +5,14 @@
* Use the core R/W API to move RPC-over-RDMA Read and Write chunks.
*/
#include <rdma/rw.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/sunrpc/svc_rdma.h>
#include <linux/sunrpc/debug.h>
#include <rdma/rw.h>
#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
@ -437,6 +440,7 @@ svc_rdma_build_writes(struct svc_rdma_write_info *info,
if (ret < 0)
goto out_initerr;
trace_svcrdma_encode_wseg(seg_handle, write_len, seg_offset);
list_add(&ctxt->rw_list, &cc->cc_rwctxts);
cc->cc_sqecount += ret;
if (write_len == seg_length - info->wi_seg_off) {
@ -526,6 +530,8 @@ int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma, __be32 *wr_ch,
ret = svc_rdma_post_chunk_ctxt(&info->wi_cc);
if (ret < 0)
goto out_err;
trace_svcrdma_encode_write(xdr->page_len);
return xdr->page_len;
out_err:
@ -582,6 +588,8 @@ int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma, __be32 *rp_ch,
ret = svc_rdma_post_chunk_ctxt(&info->wi_cc);
if (ret < 0)
goto out_err;
trace_svcrdma_encode_reply(consumed);
return consumed;
out_err:
@ -606,9 +614,6 @@ static int svc_rdma_build_read_segment(struct svc_rdma_read_info *info,
goto out_noctx;
ctxt->rw_nents = sge_no;
dprintk("svcrdma: reading segment %u@0x%016llx:0x%08x (%u sges)\n",
len, offset, rkey, sge_no);
sg = ctxt->rw_sg_table.sgl;
for (sge_no = 0; sge_no < ctxt->rw_nents; sge_no++) {
seg_len = min_t(unsigned int, len,
@ -686,6 +691,7 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp,
if (ret < 0)
break;
trace_svcrdma_encode_rseg(rs_handle, rs_length, rs_offset);
info->ri_chunklen += rs_length;
}
@ -706,9 +712,6 @@ static int svc_rdma_build_normal_read_chunk(struct svc_rqst *rqstp,
struct svc_rdma_op_ctxt *head = info->ri_readctxt;
int ret;
dprintk("svcrdma: Reading Read chunk at position %u\n",
info->ri_position);
info->ri_pageno = head->hdr_count;
info->ri_pageoff = 0;
@ -716,6 +719,8 @@ static int svc_rdma_build_normal_read_chunk(struct svc_rqst *rqstp,
if (ret < 0)
goto out;
trace_svcrdma_encode_read(info->ri_chunklen, info->ri_position);
/* Split the Receive buffer between the head and tail
* buffers at Read chunk's position. XDR roundup of the
* chunk is not included in either the pagelist or in
@ -764,8 +769,6 @@ static int svc_rdma_build_pz_read_chunk(struct svc_rqst *rqstp,
struct svc_rdma_op_ctxt *head = info->ri_readctxt;
int ret;
dprintk("svcrdma: Reading Position Zero Read chunk\n");
info->ri_pageno = head->hdr_count - 1;
info->ri_pageoff = offset_in_page(head->byte_len);
@ -773,6 +776,8 @@ static int svc_rdma_build_pz_read_chunk(struct svc_rqst *rqstp,
if (ret < 0)
goto out;
trace_svcrdma_encode_pzr(info->ri_chunklen);
head->arg.len += info->ri_chunklen;
head->arg.buflen += info->ri_chunklen;

19
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View File

@ -99,14 +99,19 @@
* where two different Write segments send portions of the same page.
*/
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/sunrpc/svc_rdma.h>
#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
static u32 xdr_padsize(u32 len)
@ -524,12 +529,6 @@ static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma,
u32 inv_rkey;
int ret;
dprintk("svcrdma: sending %s reply: head=%zu, pagelen=%u, tail=%zu\n",
(rp_ch ? "RDMA_NOMSG" : "RDMA_MSG"),
rqstp->rq_res.head[0].iov_len,
rqstp->rq_res.page_len,
rqstp->rq_res.tail[0].iov_len);
ctxt = svc_rdma_get_context(rdma);
ret = svc_rdma_map_reply_hdr(rdma, ctxt, rdma_resp,
@ -580,6 +579,7 @@ static int svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
/* Replace the original transport header with an
* RDMA_ERROR response. XID etc are preserved.
*/
trace_svcrdma_err_chunk(*rdma_resp);
p = rdma_resp + 3;
*p++ = rdma_error;
*p = err_chunk;
@ -635,9 +635,6 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
rdma_argp = page_address(rqstp->rq_pages[0]);
svc_rdma_get_write_arrays(rdma_argp, &wr_lst, &rp_ch);
dprintk("svcrdma: preparing response for XID 0x%08x\n",
be32_to_cpup(rdma_argp));
/* Create the RDMA response header. xprt->xpt_mutex,
* acquired in svc_send(), serializes RPC replies. The
* code path below that inserts the credit grant value

19
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -41,21 +41,25 @@
* Author: Tom Tucker <tom@opengridcomputing.com>
*/
#include <linux/sunrpc/svc_xprt.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/export.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <rdma/rw.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <linux/sunrpc/svc_xprt.h>
#include <linux/sunrpc/svc_rdma.h>
#include <linux/export.h>
#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
@ -862,10 +866,12 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
dprintk(" max_requests : %d\n", newxprt->sc_max_requests);
dprintk(" ord : %d\n", conn_param.initiator_depth);
trace_svcrdma_xprt_accept(&newxprt->sc_xprt);
return &newxprt->sc_xprt;
errout:
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
trace_svcrdma_xprt_fail(&newxprt->sc_xprt);
/* Take a reference in case the DTO handler runs */
svc_xprt_get(&newxprt->sc_xprt);
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
@ -896,7 +902,6 @@ static void svc_rdma_detach(struct svc_xprt *xprt)
{
struct svcxprt_rdma *rdma =
container_of(xprt, struct svcxprt_rdma, sc_xprt);
dprintk("svc: svc_rdma_detach(%p)\n", xprt);
/* Disconnect and flush posted WQE */
rdma_disconnect(rdma->sc_cm_id);
@ -908,7 +913,7 @@ static void __svc_rdma_free(struct work_struct *work)
container_of(work, struct svcxprt_rdma, sc_work);
struct svc_xprt *xprt = &rdma->sc_xprt;
dprintk("svcrdma: %s(%p)\n", __func__, rdma);
trace_svcrdma_xprt_free(xprt);
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
ib_drain_qp(rdma->sc_qp);