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    IB/mlx4: Avoid accessing netdevice when building RoCE qp1 header · 3e0629cb
    Jack Morgenstein 提交于
    The source MAC is needed in RoCE when building the QP1 header.
    
    Currently, this is obtained from the source net device. However, the net
    device may not yet exist, or can be destroyed in parallel to this QP1 send
    operation (e.g through the VPI port change flow) so accessing it may cause
    a kernel crash.
    
    To fix this, we maintain a source MAC cache per port for the net device in
    struct mlx4_ib_roce.  This cached MAC is initialized to be the default MAC
    address obtained during HCA initialization via QUERY_PORT. This cached MAC
    is updated via the netdev event notifier handler.
    
    Since the cached MAC is held in an atomic64 object, we do not need locking
    when accessing it.
    Signed-off-by: NJack Morgenstein <jackm@dev.mellanox.co.il>
    Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
    Signed-off-by: NRoland Dreier <roland@purestorage.com>
    3e0629cb
main.c 68.6 KB