• Hannes Frederic Sowa's avatar
    ipv6: remove rt6i_genid · 705f1c86
    Hannes Frederic Sowa authored
    Eric Dumazet noticed that all no-nonexthop or no-gateway routes which
    are already marked DST_HOST (e.g. input routes routes) will always be
    invalidated during sk_dst_check. Thus per-socket dst caching absolutely
    had no effect and early demuxing had no effect.
    
    Thus this patch removes rt6i_genid: fn_sernum already gets modified during
    add operations, so we only must ensure we mutate fn_sernum during ipv6
    address remove operations. This is a fairly cost extensive operations,
    but address removal should not happen that often. Also our mtu update
    functions do the same and we heard no complains so far. xfrm policy
    changes also cause a call into fib6_flush_trees. Also plug a hole in
    rt6_info (no cacheline changes).
    
    I verified via tracing that this change has effect.
    
    Cc: Eric Dumazet <eric.dumazet@gmail.com>
    Cc: YOSHIFUJI Hideaki <hideaki@yoshifuji.org>
    Cc: Vlad Yasevich <vyasevich@gmail.com>
    Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Cc: Martin Lau <kafai@fb.com>
    Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    705f1c86
route.c 77.4 KB