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svcrdma: Reserve an extra WQE for ib_drain_rq()

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Do as other ULPs already do: ensure there is an extra Receive WQE
reserved for the tear-down drain WR. I haven't heard reports of
problems but it can't hurt.

Note that rq_depth is used to compute the Send Queue depth as well,
so this fix should affect both the SQ and RQ.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2024-02-04 18:16:37 -05:00
parent c8004c1ca4
commit e67792cc96
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/xprtrdma/svc_rdma_transport.c
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@ -415,7 +415,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge)
newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests +
newxprt->sc_recv_batch;
newxprt->sc_recv_batch + 1 /* drain */;
if (rq_depth > dev->attrs.max_qp_wr) {
rq_depth = dev->attrs.max_qp_wr;
newxprt->sc_recv_batch = 1;