xprtrdma: Report when there were zero posted Receives

To show that a caller did attempt to allocate and post more Receive
buffers, the trace point in rpcrdma_post_recvs() should report when
rpcrdma_post_recvs() was invoked but no new Receive buffers were
posted.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index cfaab5e31277..3ddba94c939f 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1521,9 +1521,11 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
         struct ib_recv_wr *wr, *bad_wr;
         int needed, count, rc;
 
+        rc = 0;
+        count = 0;
         needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1);
         if (buf->rb_posted_receives > needed)
-                return;
+                goto out;
         needed -= buf->rb_posted_receives;
 
         count = 0;
@@ -1559,7 +1561,7 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
                 --needed;
         }
         if (!count)
-                return;
+                goto out;
 
         rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr,
                           (const struct ib_recv_wr **)&bad_wr);
@@ -1573,5 +1575,6 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
                 }
         }
         buf->rb_posted_receives += count;
+out:
         trace_xprtrdma_post_recvs(r_xprt, count, rc);
 }