• Xin Long's avatar
    vxlan: update skb dst pmtu on tx path · a93bf0ff
    Xin Long authored
    Unlike ip tunnels, now vxlan doesn't do any pmtu update for
    upper dst pmtu, even if it doesn't match the lower dst pmtu
    any more.
    The problem can be reproduced when reducing the vxlan lower
    dev's pmtu when running netperf. In jianlin's testing, the
    performance went to 1/7 of the previous.
    This patch is to update the upper dst pmtu to match the lower
    dst pmtu on tx path so that packets can be sent out even when
    lower dev's pmtu has been changed.
    It also works for metadata dst.
    Note that this patch doesn't process any pmtu icmp packet.
    But even in the future, the support for pmtu icmp packets
    process of udp tunnels will also needs this.
    The same thing will be done for geneve in another patch.
    Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
vxlan.c 95.5 KB