RDS: TCP: Enable multipath RDS for TCP
Use RDS probe-ping to compute how many paths may be used with
the peer, and to synchronously start the multiple paths. If mprds is
supported, hash outgoing traffic to one of multiple paths in rds_sendmsg()
when multipath RDS is supported by the transport.
CC: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 19a4fee..f505855 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -155,7 +155,7 @@
struct hlist_head *head = rds_conn_bucket(laddr, faddr);
struct rds_transport *loop_trans;
unsigned long flags;
- int ret;
+ int ret, i;
rcu_read_lock();
conn = rds_conn_lookup(net, head, laddr, faddr, trans);
@@ -211,6 +211,12 @@
conn->c_trans = trans;
+ init_waitqueue_head(&conn->c_hs_waitq);
+ for (i = 0; i < RDS_MPATH_WORKERS; i++) {
+ __rds_conn_path_init(conn, &conn->c_path[i],
+ is_outgoing);
+ conn->c_path[i].cp_index = i;
+ }
ret = trans->conn_alloc(conn, gfp);
if (ret) {
kmem_cache_free(rds_conn_slab, conn);
@@ -263,14 +269,6 @@
kmem_cache_free(rds_conn_slab, conn);
conn = found;
} else {
- int i;
-
- for (i = 0; i < RDS_MPATH_WORKERS; i++) {
- __rds_conn_path_init(conn, &conn->c_path[i],
- is_outgoing);
- conn->c_path[i].cp_index = i;
- }
-
hlist_add_head_rcu(&conn->c_hash_node, head);
rds_cong_add_conn(conn);
rds_conn_count++;
@@ -668,6 +666,7 @@
void rds_conn_drop(struct rds_connection *conn)
{
+ WARN_ON(conn->c_trans->t_mp_capable);
rds_conn_path_drop(&conn->c_path[0]);
}
EXPORT_SYMBOL_GPL(rds_conn_drop);