ca30707dee
So far drop monitor supported only one alert mode in which a summary of locations in which packets were recently dropped was sent to user space. This alert mode is sufficient in order to understand that packets were dropped, but lacks information to perform a more detailed analysis. Add a new alert mode in which the dropped packet itself is passed to user space along with metadata: The drop location (as program counter and resolved symbol), ingress netdevice and drop timestamp. More metadata can be added in the future. To avoid performing expensive operations in the context in which kfree_skb() is invoked (can be hard IRQ), the dropped skb is cloned and queued on per-CPU skb drop list. Then, in process context the netlink message is allocated, prepared and finally sent to user space. The per-CPU skb drop list is limited to 1000 skbs to prevent exhausting the system's memory. Subsequent patches will make this limit configurable and also add a counter that indicates how many skbs were tail dropped. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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