diff options
| author | Jon Paul Maloy <jon.maloy@ericsson.com> | 2016-09-01 20:52:49 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-03 03:10:24 +0300 |
| commit | 02d11ca20091fcef904f05defda80c53e5b4e793 (patch) | |
| tree | 2d1f26e4facff8b4e784c60d5a3c6163ba40ed30 /net/tipc/bcast.h | |
| parent | 2c896fb02e7f65299646f295a007bda043e0f382 (diff) | |
| download | linux-02d11ca20091fcef904f05defda80c53e5b4e793.tar.xz | |
tipc: transfer broadcast nacks in link state messages
When we send broadcasts in clusters of more 70-80 nodes, we sometimes
see the broadcast link resetting because of an excessive number of
retransmissions. This is caused by a combination of two factors:
1) A 'NACK crunch", where loss of broadcast packets is discovered
and NACK'ed by several nodes simultaneously, leading to multiple
redundant broadcast retransmissions.
2) The fact that the NACKS as such also are sent as broadcast, leading
to excessive load and packet loss on the transmitting switch/bridge.
This commit deals with the latter problem, by moving sending of
broadcast nacks from the dedicated BCAST_PROTOCOL/NACK message type
to regular unicast LINK_PROTOCOL/STATE messages. We allocate 10 unused
bits in word 8 of the said message for this purpose, and introduce a
new capability bit, TIPC_BCAST_STATE_NACK in order to keep the change
backwards compatible.
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/bcast.h')
| -rw-r--r-- | net/tipc/bcast.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h index d5e79b3767fd..5ffe34472ccd 100644 --- a/net/tipc/bcast.h +++ b/net/tipc/bcast.h @@ -56,8 +56,8 @@ int tipc_bcast_get_mtu(struct net *net); int tipc_bcast_xmit(struct net *net, struct sk_buff_head *list); int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb); void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l, u32 acked); -void tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l, - struct tipc_msg *hdr); +int tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l, + struct tipc_msg *hdr); int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg); int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[]); int tipc_bclink_reset_stats(struct net *net); |