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RDS: Update rds_conn_shutdown to work with rds_conn_path

Browse source 
This commit changes rds_conn_shutdown to take a rds_conn_path *
argument, allowing it to shutdown paths other than c_path[0] for
MP-capable transports.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2016-06-13 09:44:41 -07:00 committed by David S. Miller
parent 1c5113cf79
commit d769ef81d5
5 changed files with 44 additions and 38 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

62
net/rds/connection.c
View file

@ -96,14 +96,16 @@ static struct rds_connection *rds_conn_lookup(struct net *net,
* and receiving over this connection again in the future. It is up to
* the transport to have serialized this call with its send and recv.
*/
static void rds_conn_reset(struct rds_connection *conn)
static void rds_conn_path_reset(struct rds_conn_path *cp)
{
struct rds_connection *conn = cp->cp_conn;
rdsdebug("connection %pI4 to %pI4 reset\n",
&conn->c_laddr, &conn->c_faddr);
rds_stats_inc(s_conn_reset);
rds_send_reset(conn);
conn->c_flags = 0;
rds_send_path_reset(cp);
cp->cp_flags = 0;
/* Do not clear next_rx_seq here, else we cannot distinguish
* retransmitted packets from new packets, and will hand all
@ -294,10 +296,12 @@ struct rds_connection *rds_conn_create_outgoing(struct net *net,
}
EXPORT_SYMBOL_GPL(rds_conn_create_outgoing);
void rds_conn_shutdown(struct rds_connection *conn)
void rds_conn_shutdown(struct rds_conn_path *cp)
{
struct rds_connection *conn = cp->cp_conn;
/* shut it down unless it's down already */
if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
if (!rds_conn_path_transition(cp, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
/*
* Quiesce the connection mgmt handlers before we start tearing
* things down. We don't hold the mutex for the entire
@ -305,35 +309,41 @@ void rds_conn_shutdown(struct rds_connection *conn)
* deadlocking with the CM handler. Instead, the CM event
* handler is supposed to check for state DISCONNECTING
*/
mutex_lock(&conn->c_cm_lock);
if (!rds_conn_transition(conn, RDS_CONN_UP, RDS_CONN_DISCONNECTING)
&& !rds_conn_transition(conn, RDS_CONN_ERROR, RDS_CONN_DISCONNECTING)) {
rds_conn_error(conn, "shutdown called in state %d\n",
atomic_read(&conn->c_state));
mutex_unlock(&conn->c_cm_lock);
mutex_lock(&cp->cp_cm_lock);
if (!rds_conn_path_transition(cp, RDS_CONN_UP,
RDS_CONN_DISCONNECTING) &&
!rds_conn_path_transition(cp, RDS_CONN_ERROR,
RDS_CONN_DISCONNECTING)) {
rds_conn_path_error(cp,
"shutdown called in state %d\n",
atomic_read(&cp->cp_state));
mutex_unlock(&cp->cp_cm_lock);
return;
}
mutex_unlock(&conn->c_cm_lock);
mutex_unlock(&cp->cp_cm_lock);
wait_event(conn->c_waitq,
!test_bit(RDS_IN_XMIT, &conn->c_flags));
wait_event(conn->c_waitq,
!test_bit(RDS_RECV_REFILL, &conn->c_flags));
wait_event(cp->cp_waitq,
!test_bit(RDS_IN_XMIT, &cp->cp_flags));
wait_event(cp->cp_waitq,
!test_bit(RDS_RECV_REFILL, &cp->cp_flags));
if (!conn->c_trans->t_mp_capable)
conn->c_trans->conn_shutdown(conn);
rds_conn_reset(conn);
else
conn->c_trans->conn_path_shutdown(cp);
rds_conn_path_reset(cp);
if (!rds_conn_transition(conn, RDS_CONN_DISCONNECTING, RDS_CONN_DOWN)) {
if (!rds_conn_path_transition(cp, RDS_CONN_DISCONNECTING,
RDS_CONN_DOWN)) {
/* This can happen - eg when we're in the middle of tearing
* down the connection, and someone unloads the rds module.
* Quite reproduceable with loopback connections.
* Mostly harmless.
*/
rds_conn_error(conn,
"%s: failed to transition to state DOWN, "
"current state is %d\n",
__func__,
atomic_read(&conn->c_state));
rds_conn_path_error(cp, "%s: failed to transition "
"to state DOWN, current state "
"is %d\n", __func__,
atomic_read(&cp->cp_state));
return;
}
}
@ -342,13 +352,13 @@ void rds_conn_shutdown(struct rds_connection *conn)
* The passive side of an IB loopback connection is never added
* to the conn hash, so we never trigger a reconnect on this
* conn - the reconnect is always triggered by the active peer. */
cancel_delayed_work_sync(&conn->c_conn_w);
cancel_delayed_work_sync(&cp->cp_conn_w);
rcu_read_lock();
if (!hlist_unhashed(&conn->c_hash_node)) {
rcu_read_unlock();
if (conn->c_trans->t_type != RDS_TRANS_TCP ||
conn->c_path[0].cp_outgoing == 1)
rds_queue_reconnect(&conn->c_path[0]);
cp->cp_outgoing == 1)
rds_queue_reconnect(cp);
} else {
rcu_read_unlock();
}

5
net/rds/rds.h
View file

@ -456,6 +456,7 @@ struct rds_transport {
void (*conn_free)(void *data);
int (*conn_connect)(struct rds_connection *conn);
void (*conn_shutdown)(struct rds_connection *conn);
void (*conn_path_shutdown)(struct rds_conn_path *conn);
void (*xmit_prepare)(struct rds_connection *conn);
void (*xmit_path_prepare)(struct rds_conn_path *cp);
void (*xmit_complete)(struct rds_connection *conn);
@ -653,7 +654,7 @@ struct rds_connection *rds_conn_create(struct net *net,
struct rds_connection *rds_conn_create_outgoing(struct net *net,
__be32 laddr, __be32 faddr,
struct rds_transport *trans, gfp_t gfp);
void rds_conn_shutdown(struct rds_connection *conn);
void rds_conn_shutdown(struct rds_conn_path *cpath);
void rds_conn_destroy(struct rds_connection *conn);
void rds_conn_drop(struct rds_connection *conn);
void rds_conn_path_drop(struct rds_conn_path *cpath);
@ -786,7 +787,7 @@ void rds_inc_info_copy(struct rds_incoming *inc,
/* send.c */
int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
void rds_send_reset(struct rds_connection *conn);
void rds_send_path_reset(struct rds_conn_path *conn);
int rds_send_xmit(struct rds_conn_path *cp);
struct sockaddr_in;
void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);

9
net/rds/send.c
View file

@ -62,7 +62,7 @@ static void rds_send_remove_from_sock(struct list_head *messages, int status);
* Reset the send state. Callers must ensure that this doesn't race with
* rds_send_xmit().
*/
static void rds_send_path_reset(struct rds_conn_path *cp)
void rds_send_path_reset(struct rds_conn_path *cp)
{
struct rds_message *rm, *tmp;
unsigned long flags;
@ -99,12 +99,7 @@ static void rds_send_path_reset(struct rds_conn_path *cp)
list_splice_init(&cp->cp_retrans, &cp->cp_send_queue);
spin_unlock_irqrestore(&cp->cp_lock, flags);
}
void rds_send_reset(struct rds_connection *conn)
{
rds_send_path_reset(&conn->c_path[0]);
}
EXPORT_SYMBOL_GPL(rds_send_reset);
EXPORT_SYMBOL_GPL(rds_send_path_reset);
static int acquire_in_xmit(struct rds_conn_path *cp)
{

2
net/rds/tcp.c
View file

@ -186,7 +186,7 @@ void rds_tcp_reset_callbacks(struct socket *sock,
release_sock(osock->sk);
sock_release(osock);
newsock:
rds_send_reset(conn);
rds_send_path_reset(&conn->c_path[0]);
lock_sock(sock->sk);
write_lock_bh(&sock->sk->sk_callback_lock);
tc->t_sock = sock;

2
net/rds/threads.c
View file

@ -225,7 +225,7 @@ void rds_shutdown_worker(struct work_struct *work)
struct rds_conn_path,
cp_down_w);
rds_conn_shutdown(cp->cp_conn);
rds_conn_shutdown(cp);
}
void rds_threads_exit(void)