• Alexander Duyck's avatar
    GSO: Support partial segmentation offload · 802ab55a
    Alexander Duyck authored
    
    
    This patch adds support for something I am referring to as GSO partial.
    The basic idea is that we can support a broader range of devices for
    segmentation if we use fixed outer headers and have the hardware only
    really deal with segmenting the inner header.  The idea behind the naming
    is due to the fact that everything before csum_start will be fixed headers,
    and everything after will be the region that is handled by hardware.
    
    With the current implementation it allows us to add support for the
    following GSO types with an inner TSO_MANGLEID or TSO6 offload:
    NETIF_F_GSO_GRE
    NETIF_F_GSO_GRE_CSUM
    NETIF_F_GSO_IPIP
    NETIF_F_GSO_SIT
    NETIF_F_UDP_TUNNEL
    NETIF_F_UDP_TUNNEL_CSUM
    
    In the case of hardware that already supports tunneling we may be able to
    extend this further to support TSO_TCPV4 without TSO_MANGLEID if the
    hardware can support updating inner IPv4 headers.
    Signed-off-by: default avatarAlexander Duyck <aduyck@mirantis.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    802ab55a
netdev_features.h 8.29 KB