tipc: let first message on link be a state message
According to the link FSM, a received traffic packet can take a link
from state ESTABLISHING to ESTABLISHED, but the link can still not be
fully set up in one atomic operation. This means that even if the the
very first packet on the link is a traffic packet with sequence number
1 (one), it has to be dropped and retransmitted.
This can be avoided if we let the mentioned packet be preceded by a
LINK_PROTOCOL/STATE message, which takes up the endpoint before the
arrival of the traffic.
We add this small feature in this commit.
This is a fully compatible change.
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 774ad3c..2e28a7d 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1107,12 +1107,12 @@
return released;
}
-/* tipc_link_build_ack_msg: prepare link acknowledge message for transmission
+/* tipc_link_build_state_msg: prepare link state message for transmission
*
* Note that sending of broadcast ack is coordinated among nodes, to reduce
* risk of ack storms towards the sender
*/
-int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
+int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
{
if (!l)
return 0;
@@ -1222,7 +1222,7 @@
if (!tipc_data_input(l, skb, l->inputq))
rc |= tipc_link_input(l, skb, l->inputq);
if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
- rc |= tipc_link_build_ack_msg(l, xmitq);
+ rc |= tipc_link_build_state_msg(l, xmitq);
if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK))
break;
} while ((skb = __skb_dequeue(defq)));
diff --git a/net/tipc/link.h b/net/tipc/link.h
index 6a94175..d7e9d42 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -123,7 +123,7 @@
int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
struct sk_buff_head *xmitq);
-int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
+int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
void tipc_link_add_bc_peer(struct tipc_link *snd_l,
struct tipc_link *uc_l,
struct sk_buff_head *xmitq);
diff --git a/net/tipc/node.c b/net/tipc/node.c
index b00e12c..68d9f7b 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -545,6 +545,9 @@
pr_debug("Established link <%s> on network plane %c\n",
tipc_link_name(nl), tipc_link_plane(nl));
+ /* Ensure that a STATE message goes first */
+ tipc_link_build_state_msg(nl, xmitq);
+
/* First link? => give it both slots */
if (!ol) {
*slot0 = bearer_id;
@@ -1283,7 +1286,7 @@
/* Broadcast ACKs are sent on a unicast link */
if (rc & TIPC_LINK_SND_BC_ACK) {
tipc_node_read_lock(n);
- tipc_link_build_ack_msg(le->link, &xmitq);
+ tipc_link_build_state_msg(le->link, &xmitq);
tipc_node_read_unlock(n);
}