[PATCH v5 07/14] svcrdma: svc_rdma_post_recv() should close connection on error

Chuck Lever
2016-03-01T18:06:20Z

Clean up: Most svc_rdma_post_recv() call sites close the transport
connection when a receive cannot be posted. Wrap that in a common
helper.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Devesh Sharma <devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Tested-by: Devesh Sharma <devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
include/linux/sunrpc/svc_rdma.h | 1 +
net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 11 ++---------
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 10 +---------
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 7 +------
net/sunrpc/xprtrdma/svc_rdma_transport.c | 15 +++++++++++++++
5 files changed, 20 insertions(+), 24 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 40b6785..aef47dd 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -234,6 +234,7 @@ extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
enum rpcrdma_errcode);
extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
+extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
index de39196..254be86 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
@@ -111,16 +111,9 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
if (ret)
goto out_err;

- /* Post a recv buffer to handle the reply for this request. */
- ret = svc_rdma_post_recv(rdma, GFP_NOIO);
- if (ret) {
- pr_err("svcrdma: Failed to post bc receive buffer, err=%d.\n",
- ret);
- pr_err("svcrdma: closing transport %p.\n", rdma);
- set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
- ret = -ENOTCONN;
+ ret = svc_rdma_repost_recv(rdma, GFP_NOIO);
+ if (ret)
goto out_err;
- }

ctxt = svc_rdma_get_context(rdma);
ctxt->pages[0] = virt_to_page(rqst->rq_buffer);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index c8b8a8b..acf15b8 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -711,13 +711,5 @@ defer:
return 0;

repost:
- ret = svc_rdma_post_recv(rdma_xprt, GFP_KERNEL);
- if (ret) {
- pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
- ret);
- pr_err("svcrdma: closing transport %p.\n", rdma_xprt);
- set_bit(XPT_CLOSE, &rdma_xprt->sc_xprt.xpt_flags);
- ret = -ENOTCONN;
- }
- return ret;
+ return svc_rdma_repost_recv(rdma_xprt, GFP_KERNEL);
}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index 0f8798d..ace9efa 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -475,13 +475,8 @@ static int send_reply(struct svcxprt_rdma *rdma,
int pages;
int ret;

- /* Post a recv buffer to handle another request. */
- ret = svc_rdma_post_recv(rdma, GFP_KERNEL);
+ ret = svc_rdma_repost_recv(rdma, GFP_KERNEL);
if (ret) {
- printk(KERN_INFO
- "svcrdma: could not post a receive buffer, err=%d."
- "Closing transport %p.\n", ret, rdma);
- set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
svc_rdma_put_context(ctxt, 0);
return -ENOTCONN;
}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 5763825..03fdfce 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -722,6 +722,21 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
return -ENOMEM;
}

+int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
+{
+ int ret = 0;
+
+ ret = svc_rdma_post_recv(xprt, flags);
+ if (ret) {
+ pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
+ ret);
+ pr_err("svcrdma: closing transport %p.\n", xprt);
+ set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+ ret = -ENOTCONN;
+ }
+ return ret;
+}
+
/*
* This function handles the CONNECT_REQUEST event on a listening
* endpoint. It is passed the cma_id for the _new_ connection. The context in