• Pravin B Shelar's avatar
    net: Fix possible wrong checksum generation. · c9af6db4
    Pravin B Shelar authored
    Patch cef401de (net: fix possible wrong checksum
    generation) fixed wrong checksum calculation but it broke TSO by
    defining new GSO type but not a netdev feature for that type.
    net_gso_ok() would not allow hardware checksum/segmentation
    offload of such packets without the feature.
    
    Following patch fixes TSO and wrong checksum. This patch uses
    same logic that Eric Dumazet used. Patch introduces new flag
    SKBTX_SHARED_FRAG if at least one frag can be modified by
    the user. but SKBTX_SHARED_FRAG flag is kept in skb shared
    info tx_flags rather than gso_type.
    
    tx_flags is better compared to gso_type since we can have skb with
    shared frag without gso packet. It does not link SHARED_FRAG to
    GSO, So there is no need to define netdev feature for this.
    Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    c9af6db4
tun.c 53.9 KB