Re: [tipc-discussion] [net] tipc: fix incompatiable mtu of transmission

[Jon M. <jm...@re...>]

On 11/27/20 12:01 AM, Hoang Huu Le wrote:
> From: Hoang Le <hoa...@de...>
>
> In commit 682cd3cf946b6
> ("tipc: confgiure and apply UDP bearer MTU on running links"), we
> introduced a function to change UDP bearer MTU and applied this new value
> across existing per-link. However, we did not apply this new MTU value at
> node level. This lead to packet dropped at link level if its size is
> greater than new MTU value.
>
> To fix this issue, we also apply this new MTU value for node level.
>
> Fixes: 682cd3cf946b6 ("tipc: confgiure and apply UDP bearer MTU on running links")
> Signed-off-by: Hoang Le <hoa...@de...>
> ---
>   net/tipc/node.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/net/tipc/node.c b/net/tipc/node.c
> index cd67b7d5169f..9f6975dd7873 100644
> --- a/net/tipc/node.c
> +++ b/net/tipc/node.c
> @@ -2182,6 +2182,8 @@ void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
>   			else if (prop == TIPC_NLA_PROP_MTU)
>   				tipc_link_set_mtu(e->link, b->mtu);
>   		}
> +		/* Update MTU for node link entry */
> +		e->mtu = tipc_link_mss(e->link);
>   		tipc_node_write_unlock(n);
>   		tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
>   	}
Acked-by: Jon Maloy <jm...@re...>