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authorSantosh Shilimkar <santosh.shilimkar@oracle.com>2016-07-04 17:04:37 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-30 08:37:25 +0000
commit57d2ce1603101ce3f30d0ccdc35b98af08d2ed88 (patch)
treef386c8e15c3d2c075a9927528cb7e46207b24469 /net
parentbbb1fc744894bdba5a94b46b3e178cfb2330831d (diff)
RDS: RDMA: return appropriate error on rdma map failures
[ Upstream commit 584a8279a44a800dea5a5c1e9d53a002e03016b4 ] The first message to a remote node should prompt a new connection even if it is RDMA operation. For RDMA operation the MR mapping can fail because connections is not yet up. Since the connection establishment is asynchronous, we make sure the map failure because of unavailable connection reach to the user by appropriate error code. Before returning to the user, lets trigger the connection so that its ready for the next retry. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/rds/send.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/rds/send.c b/net/rds/send.c
index 6815f03324d7..1a3c6acdd3f8 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -959,6 +959,11 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
ret = rds_cmsg_rdma_map(rs, rm, cmsg);
if (!ret)
*allocated_mr = 1;
+ else if (ret == -ENODEV)
+ /* Accommodate the get_mr() case which can fail
+ * if connection isn't established yet.
+ */
+ ret = -EAGAIN;
break;
case RDS_CMSG_ATOMIC_CSWP:
case RDS_CMSG_ATOMIC_FADD:
@@ -1072,8 +1077,12 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
/* Parse any control messages the user may have included. */
ret = rds_cmsg_send(rs, rm, msg, &allocated_mr);
- if (ret)
+ if (ret) {
+ /* Trigger connection so that its ready for the next retry */
+ if (ret == -EAGAIN)
+ rds_conn_connect_if_down(conn);
goto out;
+ }
if (rm->rdma.op_active && !conn->c_trans->xmit_rdma) {
printk_ratelimited(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",