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svcrdma: Fix leak of svc_rdma_recv_ctxt objects

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Utilize the xpo_release_rqst transport method to ensure that each
rqstp's svc_rdma_recv_ctxt object is released even when the server
cannot return a Reply for that rqstp.

Without this fix, each RPC whose Reply cannot be sent leaks one
svc_rdma_recv_ctxt. This is a 2.5KB structure, a 4KB DMA-mapped
Receive buffer, and any pages that might be part of the Reply
message.

The leak is infrequent unless the network fabric is unreliable or
Kerberos is in use, as GSS sequence window overruns, which result
in connection loss, are more common on fast transports.

Fixes: 3a88092ee3 ("svcrdma: Preserve Receive buffer until svc_rdma_sendto")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2020-03-31 17:02:33 -04:00
parent e28b4fc652
commit 23cf1ee1f1
6 changed files with 30 additions and 18 deletions
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3
net/sunrpc/svc_xprt.c
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@@ -908,9 +908,6 @@ int svc_send(struct svc_rqst *rqstp)
if (!xprt)
goto out;
/* release the receive skb before sending the reply */
xprt->xpt_ops->xpo_release_rqst(rqstp);
/* calculate over-all length */
xb = &rqstp->rq_res;
xb->len = xb->head[0].iov_len +