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authorTrond Myklebust <trond.myklebust@hammerspace.com>2018-09-03 17:37:36 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2018-09-30 15:35:15 -0400
commit75891f502f5fc70f52a01af5b924384ed4866907 (patch)
treedae030f8d5914ed7fc87dbd7e6788804a5196a95 /net/sunrpc/xprtsock.c
parent918f3c1fe83c5baa4892b943d3f5ac7191d8fb74 (diff)
SUNRPC: Support for congestion control when queuing is enabled
Both RDMA and UDP transports require the request to get a "congestion control" credit before they can be transmitted. Right now, this is done when the request locks the socket. We'd like it to happen when a request attempts to be transmitted for the first time. In order to support retransmission of requests that already hold such credits, we also want to ensure that they get queued first, so that we don't deadlock with requests that have yet to obtain a credit. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'net/sunrpc/xprtsock.c')
-rw-r--r--net/sunrpc/xprtsock.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index b8143eded4af..8831e84a058a 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -609,6 +609,10 @@ static int xs_udp_send_request(struct rpc_rqst *req, struct rpc_task *task)
if (!xprt_bound(xprt))
return -ENOTCONN;
+
+ if (!xprt_request_get_cong(xprt, req))
+ return -EBADSLT;
+
req->rq_xtime = ktime_get();
status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
xdr, 0, true, &sent);