[PATCH AUTOSEL 5.3 05/71] xprtrdma: Toggle XPRT_CONGESTED in xprtrdma's slot methods
From: Sasha Levin <sashal@kernel.org>
Date: 2019-10-01 16:39:36
Also in:
linux-nfs, lkml, stable
Subsystem:
kernel nfsd, sunrpc, and lockd servers, networking [general], nfs, sunrpc, and lockd clients, the rest · Maintainers:
Chuck Lever, Jeff Layton, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Trond Myklebust, Anna Schumaker, Linus Torvalds
From: Chuck Lever <redacted>
[ Upstream commit 395790566eec37706dedeb94779045adc3a7581e ]
Commit 48be539dd44a ("xprtrdma: Introduce ->alloc_slot call-out for
xprtrdma") added a separate alloc_slot and free_slot to the RPC/RDMA
transport. Later, commit 75891f502f5f ("SUNRPC: Support for
congestion control when queuing is enabled") modified the generic
alloc/free_slot methods, but neglected the methods in xprtrdma.
Found via code review.
Fixes: 75891f502f5f ("SUNRPC: Support for congestion control ... ")
Signed-off-by: Chuck Lever <redacted>
Signed-off-by: Anna Schumaker <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/xprtrdma/transport.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 2ec349ed47702..f4763e8a67617 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c@@ -571,6 +571,7 @@ xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) return; out_sleep: + set_bit(XPRT_CONGESTED, &xprt->state); rpc_sleep_on(&xprt->backlog, task, NULL); task->tk_status = -EAGAIN; }
@@ -589,7 +590,8 @@ xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) memset(rqst, 0, sizeof(*rqst)); rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); - rpc_wake_up_next(&xprt->backlog); + if (unlikely(!rpc_wake_up_next(&xprt->backlog))) + clear_bit(XPRT_CONGESTED, &xprt->state); } static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt,
--
2.20.1