From fc709d82dda6405862a681cc425386bfaf049539 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Sun, 4 Feb 2024 18:17:15 -0500 Subject: svcrdma: Fix retry loop in svc_rdma_send() Don't call ib_post_send() at all if the transport is already shutting down. Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/svc_rdma_sendto.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index b6fc9299b472..0ee9185f5f3f 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -320,8 +320,9 @@ flushed: * that these values remain available after the ib_post_send() call. * In some error flow cases, svc_rdma_wc_send() releases @ctxt. * - * Returns zero if the Send WR was posted successfully. Otherwise, a - * negative errno is returned. + * Return values: + * %0: @ctxt's WR chain was posted successfully + * %-ENOTCONN: The connection was lost */ int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt) { @@ -338,30 +339,35 @@ int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt) DMA_TO_DEVICE); /* If the SQ is full, wait until an SQ entry is available */ - while (1) { + while (!test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags)) { if ((atomic_dec_return(&rdma->sc_sq_avail) < 0)) { svc_rdma_wake_send_waiters(rdma, 1); + + /* When the transport is torn down, assume + * ib_drain_sq() will trigger enough Send + * completions to wake us. The XPT_CLOSE test + * above should then cause the while loop to + * exit. + */ percpu_counter_inc(&svcrdma_stat_sq_starve); trace_svcrdma_sq_full(rdma, &cid); wait_event(rdma->sc_send_wait, atomic_read(&rdma->sc_sq_avail) > 0); - if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags)) - return -ENOTCONN; trace_svcrdma_sq_retry(rdma, &cid); continue; } trace_svcrdma_post_send(ctxt); ret = ib_post_send(rdma->sc_qp, wr, NULL); - if (ret) + if (ret) { + trace_svcrdma_sq_post_err(rdma, &cid, ret); + svc_xprt_deferred_close(&rdma->sc_xprt); + svc_rdma_wake_send_waiters(rdma, 1); break; + } return 0; } - - trace_svcrdma_sq_post_err(rdma, &cid, ret); - svc_xprt_deferred_close(&rdma->sc_xprt); - svc_rdma_wake_send_waiters(rdma, 1); - return ret; + return -ENOTCONN; } /** -- cgit v1.2.3