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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2017-06-21 22:40:12 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-22 17:34:04 +0200 |
| commit | 69b92b5b7419846e2a0d61a097b11b17a089e046 (patch) | |
| tree | dc21d77a3eed374fb5be93efaa1c0b2ebd2d81b9 /net/rds/send.c | |
| parent | ibmvnic: Correct return code checking for ibmvnic_init during probe (diff) | |
| download | linux-69b92b5b7419846e2a0d61a097b11b17a089e046.tar.xz linux-69b92b5b7419846e2a0d61a097b11b17a089e046.zip | |
rds: tcp: send handshake ping-probe from passive endpoint
The RDS handshake ping probe added by commit 5916e2c1554f
("RDS: TCP: Enable multipath RDS for TCP") is sent from rds_sendmsg()
before the first data packet is sent to a peer. If the conversation
is not bidirectional (i.e., one side is always passive and never
invokes rds_sendmsg()) and the passive side restarts its rds_tcp
module, a new HS ping probe needs to be sent, so that the number
of paths can be re-established.
This patch achieves that by sending a HS ping probe from
rds_tcp_accept_one() when c_npaths is 0 (i.e., we have not done
a handshake probe with this peer yet).
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Tested-by: Jenny Xu <jenny.x.xu@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/send.c')
| -rw-r--r-- | net/rds/send.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/net/rds/send.c b/net/rds/send.c index 3652a50397c7..e81aa176f4e2 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -971,8 +971,6 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm, return ret; } -static void rds_send_ping(struct rds_connection *conn); - static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn) { int hash; @@ -982,7 +980,7 @@ static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn) else hash = RDS_MPATH_HASH(rs, conn->c_npaths); if (conn->c_npaths == 0 && hash != 0) { - rds_send_ping(conn); + rds_send_ping(conn, 0); if (conn->c_npaths == 0) { wait_event_interruptible(conn->c_hs_waitq, @@ -1282,11 +1280,11 @@ rds_send_pong(struct rds_conn_path *cp, __be16 dport) return rds_send_probe(cp, 0, dport, 0); } -static void -rds_send_ping(struct rds_connection *conn) +void +rds_send_ping(struct rds_connection *conn, int cp_index) { unsigned long flags; - struct rds_conn_path *cp = &conn->c_path[0]; + struct rds_conn_path *cp = &conn->c_path[cp_index]; spin_lock_irqsave(&cp->cp_lock, flags); if (conn->c_ping_triggered) { @@ -1295,6 +1293,6 @@ rds_send_ping(struct rds_connection *conn) } conn->c_ping_triggered = 1; spin_unlock_irqrestore(&cp->cp_lock, flags); - rds_send_probe(&conn->c_path[0], cpu_to_be16(RDS_FLAG_PROBE_PORT), - 0, 0); + rds_send_probe(cp, cpu_to_be16(RDS_FLAG_PROBE_PORT), 0, 0); } +EXPORT_SYMBOL_GPL(rds_send_ping); |