[PATCH v1 04/12] xprtrdma: Add trace points in the RPC Reply handler paths

Chuck Lever
2017-12-20T21:30:48Z

include/trace/events/rpcrdma.h | 162 ++++++++++++++++++++++++++++++++++++++++
net/sunrpc/xprtrdma/rpc_rdma.c | 17 +---
net/sunrpc/xprtrdma/verbs.c | 11 +--
3 files changed, 171 insertions(+), 19 deletions(-)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index 8efb2c9..e11bb32 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -11,6 +11,46 @@
#include <trace/events/rdma.h>

/**
+ ** Event classes
+ **/
+
+DECLARE_EVENT_CLASS(xprtrdma_reply_event,
+ TP_PROTO(
+ const struct rpcrdma_rep *rep
+ ),
+
+ TP_ARGS(rep),
+
+ TP_STRUCT__entry(
+ __field(const void *, rep)
+ __field(const void *, r_xprt)
+ __field(u32, xid)
+ __field(u32, version)
+ __field(u32, proc)
+ ),
+
+ TP_fast_assign(
+ __entry->rep = rep;
+ __entry->r_xprt = rep->rr_rxprt;
+ __entry->xid = be32_to_cpu(rep->rr_xid);
+ __entry->version = be32_to_cpu(rep->rr_vers);
+ __entry->proc = be32_to_cpu(rep->rr_proc);
+ ),
+
+ TP_printk("rxprt %p xid=0x%08x rep=%p: version %u proc %u",
+ __entry->r_xprt, __entry->xid, __entry->rep,
+ __entry->version, __entry->proc
+ )
+);
+
+#define DEFINE_REPLY_EVENT(name) \
+ DEFINE_EVENT(xprtrdma_reply_event, name, \
+ TP_PROTO( \
+ const struct rpcrdma_rep *rep \
+ ), \
+ TP_ARGS(rep))
+
+/**
** Call events
**/

@@ -101,6 +141,29 @@
)
);

+TRACE_EVENT(xprtrdma_post_recv,
+ TP_PROTO(
+ const struct rpcrdma_rep *rep,
+ int status
+ ),
+
+ TP_ARGS(rep, status),
+
+ TP_STRUCT__entry(
+ __field(const void *, rep)
+ __field(int, status)
+ ),
+
+ TP_fast_assign(
+ __entry->rep = rep;
+ __entry->status = status;
+ ),
+
+ TP_printk("rep=%p status=%d",
+ __entry->rep, __entry->status
+ )
+);
+
/**
** Completion events
**/
@@ -134,6 +197,105 @@
)
);

+TRACE_EVENT(xprtrdma_wc_receive,
+ TP_PROTO(
+ const struct rpcrdma_rep *rep,
+ const struct ib_wc *wc
+ ),
+
+ TP_ARGS(rep, wc),
+
+ TP_STRUCT__entry(
+ __field(const void *, rep)
+ __field(unsigned int, byte_len)
+ __field(unsigned int, status)
+ __field(unsigned int, vendor_err)
+ ),
+
+ TP_fast_assign(
+ __entry->rep = rep;
+ __entry->byte_len = wc->byte_len;
+ __entry->status = wc->status;
+ __entry->vendor_err = __entry->status ? wc->vendor_err : 0;
+ ),
+
+ TP_printk("rep=%p, %u bytes: %s (%u/0x%x)",
+ __entry->rep, __entry->byte_len,
+ rdma_show_wc_status(__entry->status),
+ __entry->status, __entry->vendor_err
+ )
+);
+
+/**
+ ** Reply events
+ **/
+
+TRACE_EVENT(xprtrdma_reply,
+ TP_PROTO(
+ const struct rpc_task *task,
+ const struct rpcrdma_rep *rep,
+ const struct rpcrdma_req *req,
+ unsigned int credits
+ ),
+
+ TP_ARGS(task, rep, req, credits),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, task_id)
+ __field(unsigned int, client_id)
+ __field(const void *, rep)
+ __field(const void *, req)
+ __field(u32, xid)
+ __field(unsigned int, credits)
+ ),
+
+ TP_fast_assign(
+ __entry->task_id = task->tk_pid;
+ __entry->client_id = task->tk_client->cl_clid;
+ __entry->rep = rep;
+ __entry->req = req;
+ __entry->xid = be32_to_cpu(rep->rr_xid);
+ __entry->credits = credits;
+ ),
+
+ TP_printk("task:%u@%u xid=0x%08x, %u credits, rep=%p -> req=%p",
+ __entry->task_id, __entry->client_id, __entry->xid,
+ __entry->credits, __entry->rep, __entry->req
+ )
+);
+
+TRACE_EVENT(xprtrdma_defer_cmp,
+ TP_PROTO(
+ const struct rpcrdma_rep *rep
+ ),
+
+ TP_ARGS(rep),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, task_id)
+ __field(unsigned int, client_id)
+ __field(const void *, rep)
+ __field(u32, xid)
+ ),
+
+ TP_fast_assign(
+ __entry->task_id = rep->rr_rqst->rq_task->tk_pid;
+ __entry->client_id = rep->rr_rqst->rq_task->tk_client->cl_clid;
+ __entry->rep = rep;
+ __entry->xid = be32_to_cpu(rep->rr_xid);
+ ),
+
+ TP_printk("task:%u@%u xid=0x%08x rep=%p",
+ __entry->task_id, __entry->client_id, __entry->xid,
+ __entry->rep
+ )
+);
+
+DEFINE_REPLY_EVENT(xprtrdma_reply_vers);
+DEFINE_REPLY_EVENT(xprtrdma_reply_rqst);
+DEFINE_REPLY_EVENT(xprtrdma_reply_short);
+DEFINE_REPLY_EVENT(xprtrdma_reply_hdr);
+
#endif /* _TRACE_RPCRDMA_H */

#include <trace/define_trace.h>
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 162c0fd..6f774f1e4 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -1278,8 +1278,7 @@ void rpcrdma_complete_rqst(struct rpcrdma_rep *rep)
* being marshaled.
*/
out_badheader:
- dprintk("RPC: %5u %s: invalid rpcrdma reply (type %u)\n",
- rqst->rq_task->tk_pid, __func__, be32_to_cpu(rep->rr_proc));
+ trace_xprtrdma_reply_hdr(rep);
r_xprt->rx_stats.bad_reply_count++;
status = -EIO;
goto out;
@@ -1323,6 +1322,7 @@ void rpcrdma_deferred_completion(struct work_struct *work)
struct rpcrdma_req *req = rpcr_to_rdmar(rep->rr_rqst);
struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;

+ trace_xprtrdma_defer_cmp(rep);
if (rep->rr_wc_flags & IB_WC_WITH_INVALIDATE)
r_xprt->rx_ia.ri_ops->ro_reminv(rep, &req->rl_registered);
rpcrdma_release_rqst(r_xprt, req);
@@ -1344,8 +1344,6 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
u32 credits;
__be32 *p;

- dprintk("RPC: %s: incoming rep %p\n", __func__, rep);
-
if (rep->rr_hdrbuf.head[0].iov_len == 0)
goto out_badstatus;

@@ -1389,8 +1387,7 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
rep->rr_rqst = rqst;
clear_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);

- dprintk("RPC: %s: reply %p completes request %p (xid 0x%08x)\n",
- __func__, rep, req, be32_to_cpu(rep->rr_xid));
+ trace_xprtrdma_reply(rqst->rq_task, rep, req, credits);

queue_work_on(req->rl_cpu, rpcrdma_receive_wq, &rep->rr_work);
return;
@@ -1404,8 +1401,7 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
return;

out_badversion:
- dprintk("RPC: %s: invalid version %d\n",
- __func__, be32_to_cpu(rep->rr_vers));
+ trace_xprtrdma_reply_vers(rep);
goto repost;

/* The RPC transaction has already been terminated, or the header
@@ -1413,12 +1409,11 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
*/
out_norqst:
spin_unlock(&xprt->recv_lock);
- dprintk("RPC: %s: no match for incoming xid 0x%08x\n",
- __func__, be32_to_cpu(rep->rr_xid));
+ trace_xprtrdma_reply_rqst(rep);
goto repost;

out_shortreply:
- dprintk("RPC: %s: short/invalid reply\n", __func__);
+ trace_xprtrdma_reply_short(rep);

/* If no pending RPC transaction was matched, post a replacement
* receive buffer before returning.
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 06d86b8..cfa3c03 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -156,13 +156,11 @@
rr_cqe);

/* WARNING: Only wr_id and status are reliable at this point */
+ trace_xprtrdma_wc_receive(rep, wc);
if (wc->status != IB_WC_SUCCESS)
goto out_fail;

/* status == SUCCESS means all fields in wc are trustworthy */
- dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
- __func__, rep, wc->byte_len);
-
rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
rep->rr_wc_flags = wc->wc_flags;
rep->rr_inv_rkey = wc->ex.invalidate_rkey;
@@ -1576,17 +1574,14 @@ struct rpcrdma_regbuf *
if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf))
goto out_map;
rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail);
+ trace_xprtrdma_post_recv(rep, rc);
if (rc)
- goto out_postrecv;
+ return -ENOTCONN;
return 0;

out_map:
pr_err("rpcrdma: failed to DMA map the Receive buffer\n");
return -EIO;
-
-out_postrecv:
- pr_err("rpcrdma: ib_post_recv returned %i\n", rc);
- return -ENOTCONN;
}

/**