Re: [PATCH] ipv6: Don't depend on per socket memory for neighbour discovery messages

[Hannes Frederic Sowa <hannes@stressinduktion.org>]

On Wed, Aug 28, 2013 at 01:07:25AM +0200, Thomas Graf wrote:
> Allocating skbs when sending out neighbour discovery messages
> currently uses sock_alloc_send_skb() based on a per net namespace
> socket and thus share a socket wmem buffer space.
> 
> If a netdevice is temporarily unable to transmit due to carrier
> loss or for other reasons, the queued up ndisc messages will cosnume
> all of the wmem space and will thus prevent from any more skbs to
> be allocated even for netdevices that are able to transmit packets.
> 
> The number of neighbour discovery messages sent is very limited,
> simply use alloc_skb() and don't depend on any socket wmem space any
> longer.
> 
> This patch has orginally been posted by Eric Dumazet in a modified
> form.
> 
> Signed-off-by: Thomas Graf <tgraf@suug.ch>
> Cc: Eric Dumazet <eric.dumazet@gmail.com>

Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>

This fixes a real bug (I also had this issue) and thus would propose it
for stable, too.

Thanks!