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svcrdma: Fix SQ wake-ups

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Ensure there is a wake-up when increasing sc_sq_avail.

Likewise, if a wake-up is done, sc_sq_avail needs to be updated,
otherwise the wait_event() conditional is never going to be met.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2024-02-04 18:17:03 -05:00
parent 2da0f610e7
commit 5b9a85899c
1 changed files with 3 additions and 3 deletions
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6
net/sunrpc/xprtrdma/svc_rdma_sendto.c
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@ -335,11 +335,11 @@ int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt)
/* If the SQ is full, wait until an SQ entry is available */
while (1) {
if ((atomic_dec_return(&rdma->sc_sq_avail) < 0)) {
svc_rdma_wake_send_waiters(rdma, 1);
percpu_counter_inc(&svcrdma_stat_sq_starve);
trace_svcrdma_sq_full(rdma, &ctxt->sc_cid);
atomic_inc(&rdma->sc_sq_avail);
wait_event(rdma->sc_send_wait,
atomic_read(&rdma->sc_sq_avail) > 1);
atomic_read(&rdma->sc_sq_avail) > 0);
if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))
return -ENOTCONN;
trace_svcrdma_sq_retry(rdma, &ctxt->sc_cid);
@ -355,7 +355,7 @@ int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt)
trace_svcrdma_sq_post_err(rdma, &ctxt->sc_cid, ret);
svc_xprt_deferred_close(&rdma->sc_xprt);
wake_up(&rdma->sc_send_wait);
svc_rdma_wake_send_waiters(rdma, 1);
return ret;
}