• Paolo Abeni's avatar
    udp: implement GRO for plain UDP sockets. · e20cf8d3
    Paolo Abeni authored
    This is the RX counterpart of commit bec1f6f6 ("udp: generate gso
    with UDP_SEGMENT"). When UDP_GRO is enabled, such socket is also
    eligible for GRO in the rx path: UDP segments directed to such socket
    are assembled into a larger GSO_UDP_L4 packet.
    The core UDP GRO support is enabled with setsockopt(UDP_GRO).
    Initial benchmark numbers:
    udp rx:   1079 MB/s   769065 calls/s
    udp rx:   1466 MB/s    24877 calls/s
    This change introduces a side effect in respect to UDP tunnels:
    after a UDP tunnel creation, now the kernel performs a lookup per ingress
    UDP packet, while before such lookup happened only if the ingress packet
    carried a valid internal header csum.
    rfc v2 -> rfc v3:
     - fixed typos in macro name and comments
     - really enforce UDP_GRO_CNT_MAX, instead of UDP_GRO_CNT_MAX + 1
     - acquire socket lock in UDP_GRO setsockopt
    rfc v1 -> rfc v2:
     - use a new option to enable UDP GRO
     - use static keys to protect the UDP GRO socket lookup
    Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
udp_offload.c 4.66 KB