• Tom Herbert's avatar
    net: Allow GRO to use and set levels of checksum unnecessary · 662880f4
    Tom Herbert authored
    Allow GRO path to "consume" checksums provided in CHECKSUM_UNNECESSARY
    and to report new checksums verfied for use in fallback to normal
    path.
    
    Change GRO checksum path to track csum_level using a csum_cnt field
    in NAPI_GRO_CB. On GRO initialization, if ip_summed is
    CHECKSUM_UNNECESSARY set NAPI_GRO_CB(skb)->csum_cnt to
    skb->csum_level + 1. For each checksum verified, decrement
    NAPI_GRO_CB(skb)->csum_cnt while its greater than zero. If a checksum
    is verfied and NAPI_GRO_CB(skb)->csum_cnt == 0, we have verified a
    deeper checksum than originally indicated in skbuf so increment
    csum_level (or initialize to CHECKSUM_UNNECESSARY if ip_summed is
    CHECKSUM_NONE or CHECKSUM_COMPLETE).
    Signed-off-by: default avatarTom Herbert <therbert@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    662880f4
gre_offload.c 6.22 KB