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xprtrdma: Report when there were zero posted Receives

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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>
This commit is contained in:
Chuck Lever 2018-10-01 14:26:35 -04:00 committed by Anna Schumaker
parent 512ccfb61a
commit 61c208a5ca
1 changed files with 5 additions and 2 deletions
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7
net/sunrpc/xprtrdma/verbs.c
View file

@ -1521,9 +1521,11 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
struct ib_recv_wr *wr, *bad_wr; struct ib_recv_wr *wr, *bad_wr;
int needed, count, rc; int needed, count, rc;
rc = 0;
count = 0;
needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1); needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1);
if (buf->rb_posted_receives > needed) if (buf->rb_posted_receives > needed)
return; goto out;
needed -= buf->rb_posted_receives; needed -= buf->rb_posted_receives;
count = 0; count = 0;
@ -1559,7 +1561,7 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
--needed; --needed;
} }
if (!count) if (!count)
return; goto out;
rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr, rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr,
(const struct ib_recv_wr **)&bad_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; buf->rb_posted_receives += count;
out:
trace_xprtrdma_post_recvs(r_xprt, count, rc); trace_xprtrdma_post_recvs(r_xprt, count, rc);
} }