• Magnus Karlsson's avatar
    xsk: add support for bind for Rx · 965a9909
    Magnus Karlsson authored
    Here, the bind syscall is added. Binding an AF_XDP socket, means
    associating the socket to an umem, a netdev and a queue index. This
    can be done in two ways.
    
    The first way, creating a "socket from scratch". Create the umem using
    the XDP_UMEM_REG setsockopt and an associated fill queue with
    XDP_UMEM_FILL_QUEUE. Create the Rx queue using the XDP_RX_QUEUE
    setsockopt. Call bind passing ifindex and queue index ("channel" in
    ethtool speak).
    
    The second way to bind a socket, is simply skipping the
    umem/netdev/queue index, and passing another already setup AF_XDP
    socket. The new socket will then have the same umem/netdev/queue index
    as the parent so it will share the same umem. You must also set the
    flags field in the socket address to XDP_SHARED_UMEM.
    
    v2: Use PTR_ERR instead of passing error variable explicitly.
    Signed-off-by: default avatarMagnus Karlsson <magnus.karlsson@intel.com>
    Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
    965a9909
xsk.c 8.21 KB