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authorChuck Lever <chuck.lever@oracle.com>2014-05-28 18:34:07 +0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2014-06-04 16:56:47 +0400
commitec62f40d3505a643497d105c297093bb90afd44e (patch)
tree32cb9abf5da170e58d6855d78cd4d6b5016c3652 /net
parent65866f8259851cea5e356d2fd46fc37a4e26330e (diff)
downloadlinux-ec62f40d3505a643497d105c297093bb90afd44e.tar.xz
xprtrdma: Ensure ia->ri_id->qp is not NULL when reconnecting
Devesh Sharma <Devesh.Sharma@Emulex.Com> reports that after a disconnect, his HCA is failing to create a fresh QP, leaving ia_ri->ri_id->qp set to NULL. But xprtrdma still allows RPCs to wake up and post LOCAL_INV as they exit, causing an oops. rpcrdma_ep_connect() is allowing the wake-up by leaking the QP creation error code (-EPERM in this case) to the RPC client's generic layer. xprt_connect_status() does not recognize -EPERM, so it kills pending RPC tasks immediately rather than retrying the connect. Re-arrange the QP creation logic so that when it fails on reconnect, it leaves ->qp with the old QP rather than NULL. If pending RPC tasks wake and exit, LOCAL_INV work requests will flush rather than oops. On initial connect, leaving ->qp == NULL is OK, since there are no pending RPCs that might use ->qp. But be sure not to try to destroy a NULL QP when rpcrdma_ep_connect() is retried. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index c80995af82de..54edf2ac48a1 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -867,6 +867,7 @@ rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
if (ep->rep_connected != 0) {
struct rpcrdma_xprt *xprt;
retry:
+ dprintk("RPC: %s: reconnecting...\n", __func__);
rc = rpcrdma_ep_disconnect(ep, ia);
if (rc && rc != -ENOTCONN)
dprintk("RPC: %s: rpcrdma_ep_disconnect"
@@ -879,7 +880,7 @@ retry:
id = rpcrdma_create_id(xprt, ia,
(struct sockaddr *)&xprt->rx_data.addr);
if (IS_ERR(id)) {
- rc = PTR_ERR(id);
+ rc = -EHOSTUNREACH;
goto out;
}
/* TEMP TEMP TEMP - fail if new device:
@@ -893,20 +894,30 @@ retry:
printk("RPC: %s: can't reconnect on "
"different device!\n", __func__);
rdma_destroy_id(id);
- rc = -ENETDOWN;
+ rc = -ENETUNREACH;
goto out;
}
/* END TEMP */
+ rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
+ if (rc) {
+ dprintk("RPC: %s: rdma_create_qp failed %i\n",
+ __func__, rc);
+ rdma_destroy_id(id);
+ rc = -ENETUNREACH;
+ goto out;
+ }
rdma_destroy_qp(ia->ri_id);
rdma_destroy_id(ia->ri_id);
ia->ri_id = id;
- }
-
- rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
- if (rc) {
- dprintk("RPC: %s: rdma_create_qp failed %i\n",
- __func__, rc);
- goto out;
+ } else {
+ dprintk("RPC: %s: connecting...\n", __func__);
+ rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
+ if (rc) {
+ dprintk("RPC: %s: rdma_create_qp failed %i\n",
+ __func__, rc);
+ /* do not update ep->rep_connected */
+ return -ENETUNREACH;
+ }
}
/* XXX Tavor device performs badly with 2K MTU! */