• Menglong Dong's avatar
    net: skb: introduce kfree_skb_reason() · c504e5c2
    Menglong Dong authored
    Introduce the interface kfree_skb_reason(), which is able to pass
    the reason why the skb is dropped to 'kfree_skb' tracepoint.
    
    Add the 'reason' field to 'trace_kfree_skb', therefor user can get
    more detail information about abnormal skb with 'drop_monitor' or
    eBPF.
    
    All drop reasons are defined in the enum 'skb_drop_reason', and
    they will be print as string in 'kfree_skb' tracepoint in format
    of 'reason: XXX'.
    
    ( Maybe the reasons should be defined in a uapi header file, so that
    user space can use them? )
    Signed-off-by: default avatarMenglong Dong <imagedong@tencent.com>
    Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
    c504e5c2
drop_monitor.c 41.1 KB