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| author |   Jon Paul Maloy <jon.maloy@ericsson.com> | 2015-08-20 02:12:55 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-08-23 16:14:45 -0700 |
| commit | 5ae2f8e6857968d6dddbd3879ed0a32b860e02d1 (patch) | |
| tree | e46e980ddb0ff5c3129981aa817e17c4a4006426 /net/tipc/node.c | |
| parent | tipc: eliminate risk of premature link setup during failover (diff) | |
| download | linux-dev-5ae2f8e6857968d6dddbd3879ed0a32b860e02d1.tar.xz linux-dev-5ae2f8e6857968d6dddbd3879ed0a32b860e02d1.zip | |
tipc: interrupt link synchronization when a link goes down
When we introduced the new link failover/synch mechanism
in commit 6e498158a827fd515b514842e9a06bdf0f75ab86
("tipc: move link synch and failover to link aggregation level"),
we missed the case when the non-tunnel link goes down during the link
synchronization period. In this case the tunnel link will remain in
state LINK_SYNCHING, something leading to unpredictable behavior when
the failover procedure is initiated.
In this commit, we ensure that the node and remaining link goes
back to regular communication state (SELF_UP_PEER_UP/LINK_ESTABLISHED)
when one of the parallel links goes down. We also ensure that we don't
re-enter synch mode if subsequent SYNCH packets arrive on the remaining
link.
Reviewed-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>
Diffstat (limited to 'net/tipc/node.c')
| -rw-r--r-- | net/tipc/node.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c index 004834bd1605..937cc6192bcf 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -423,6 +423,8 @@ static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, /* There is still a working link => initiate failover */ tnl = node_active_link(n, 0); + tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT); + tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1); tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq); tipc_link_reset(l); @@ -1140,6 +1142,10 @@ static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb, return true; } + /* No synching needed if only one link */ + if (!pl || !tipc_link_is_up(pl)) + return true; + /* Initiate or update synch mode if applicable */ if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) { syncpt = iseqno + exp_pkts - 1; @@ -1158,9 +1164,8 @@ static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb, /* Open tunnel link when parallel link reaches synch point */ if ((n->state == NODE_SYNCHING) && tipc_link_is_synching(l)) { - if (pl) - dlv_nxt = mod(pl->rcv_nxt - skb_queue_len(pl->inputq)); - if (!pl || more(dlv_nxt, n->sync_point)) { + dlv_nxt = pl->rcv_nxt - mod(skb_queue_len(pl->inputq)); + if (more(dlv_nxt, n->sync_point)) { tipc_link_fsm_evt(l, LINK_SYNCH_END_EVT); tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT); return true; |