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rds: RDS (tcp) hangs on sendto() to unresponding address

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In rds_send_mprds_hash(), if the calculated hash value is non-zero and
the MPRDS connections are not yet up, it will wait.  But it should not
wait if the send is non-blocking.  In this case, it should just use the
base c_path for sending the message.

Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ka-Cheong Poon 2018-10-08 09:17:11 -07:00 committed by David S. Miller
parent 52b5d6f5dc
commit 9a4890bd6d
1 changed files with 10 additions and 3 deletions
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13
net/rds/send.c
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@ -1007,7 +1007,8 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
return ret;
}
static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn)
static int rds_send_mprds_hash(struct rds_sock *rs,
struct rds_connection *conn, int nonblock)
{
int hash;
@ -1023,10 +1024,16 @@ static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn)
* used. But if we are interrupted, we have to use the zero
* c_path in case the connection ends up being non-MP capable.
*/
if (conn->c_npaths == 0)
if (conn->c_npaths == 0) {
/* Cannot wait for the connection be made, so just use
* the base c_path.
*/
if (nonblock)
return 0;
if (wait_event_interruptible(conn->c_hs_waitq,
conn->c_npaths != 0))
hash = 0;
}
if (conn->c_npaths == 1)
hash = 0;
}
@ -1256,7 +1263,7 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
}
if (conn->c_trans->t_mp_capable)
cpath = &conn->c_path[rds_send_mprds_hash(rs, conn)];
cpath = &conn->c_path[rds_send_mprds_hash(rs, conn, nonblock)];
else
cpath = &conn->c_path[0];