From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: [net-next][PATCH v3 07/17] RDS: RDMA: return appropriate error on rdma map failures Date: Mon, 2 Jan 2017 14:45:42 -0800 Message-ID: <1483397152-8307-8-git-send-email-santosh.shilimkar@oracle.com> References: <1483397152-8307-1-git-send-email-santosh.shilimkar@oracle.com> Cc: linux-kernel@vger.kernel.org, santosh.shilimkar@oracle.com To: netdev@vger.kernel.org, davem@davemloft.net Return-path: In-Reply-To: <1483397152-8307-1-git-send-email-santosh.shilimkar@oracle.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 --- net/rds/send.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/net/rds/send.c b/net/rds/send.c index bb13c56..0a6f38b 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -945,6 +945,11 @@ 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: @@ -1082,8 +1087,12 @@ 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", -- 1.9.1