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sunrpc: Add static trace point to report result of RPC ping

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This information can help track down local misconfiguration issues
as well as network partitions and unresponsive servers.

There are several ways to send a ping, and with transport multi-
plexing, the exact rpc_xprt that is used is sometimes not known by
the upper layer. The rpc_xprt pointer passed to the trace point
call also has to be RCU-safe.

I found a spot inside the client FSM where an rpc_xprt pointer is
always available and safe to use.

Suggested-by: Bill Baker <Bill.Baker@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2018-03-16 10:33:55 -04:00
committed by Anna Schumaker
parent 40bf7eb304
commit a25a4cb3af
2 changed files with 27 additions and 0 deletions
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6
net/sunrpc/clnt.c
View File

@ -2014,6 +2014,9 @@ call_transmit_status(struct rpc_task *task)
case -EPERM:
if (RPC_IS_SOFTCONN(task)) {
xprt_end_transmit(task);
if (!task->tk_msg.rpc_proc->p_proc)
trace_xprt_ping(task->tk_xprt,
task->tk_status);
rpc_exit(task, task->tk_status);
break;
}
@ -2112,6 +2115,9 @@ call_status(struct rpc_task *task)
struct rpc_rqst *req = task->tk_rqstp;
int status;
if (!task->tk_msg.rpc_proc->p_proc)
trace_xprt_ping(task->tk_xprt, task->tk_status);
if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
task->tk_status = req->rq_reply_bytes_recvd;