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svcrdma: Trace key RPC/RDMA protocol events

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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
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23
net/sunrpc/xprtrdma/svc_rdma_rw.c
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@@ -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;