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    ipv6: Don't depend on per socket memory for neighbour discovery messages · 25a6e6b8
    Thomas Graf 提交于
    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,
    use of alloc_skb() bypasses the socket wmem buffer size enforcement
    while the manual call to skb_set_owner_w() maintains the socket
    reference needed for the IPv6 output path.
    
    This patch has orginally been posted by Eric Dumazet in a modified
    form.
    Signed-off-by: NThomas Graf <tgraf@suug.ch>
    Cc: Eric Dumazet <eric.dumazet@gmail.com>
    Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
    Cc: Stephen Warren <swarren@wwwdotorg.org>
    Cc: Fabio Estevam <festevam@gmail.com>
    Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
    Tested-by: NStephen Warren <swarren@nvidia.com>
    Acked-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    25a6e6b8
ndisc.c 41.7 KB