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xprtrdma: Chain Send to FastReg WRs

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With FRWR, the client transport can perform memory registration and
post a Send with just a single ib_post_send.

This reduces contention between the send_request path and the Send
Completion handlers, and reduces the overhead of registering a chunk
that has multiple segments.

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
2018-02-28 15:30:59 -05:00
committed by Anna Schumaker
parent fb14ae8853
commit f287762308
4 changed files with 49 additions and 18 deletions
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3
net/sunrpc/xprtrdma/verbs.c
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@@ -1535,7 +1535,6 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
struct rpcrdma_req *req)
{
struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr;
struct ib_send_wr *send_wr_fail;
int rc;
if (req->rl_reply) {
@@ -1554,7 +1553,7 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
--ep->rep_send_count;
}
rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail);
rc = ia->ri_ops->ro_send(ia, req);
trace_xprtrdma_post_send(req, rc);
if (rc)
return -ENOTCONN;