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    Subject[PATCH v2 net-next 0/3 ] tunneling: Add support for hardware-offloaded encapsulation
    Date
    The series contains updates to add in the NIC Rx and Tx checksumming support
    for encapsulated packets.

    The sk_buff needs to somehow have information of the inner packet, and adding
    three fields for the inner mac, network and transport headers was the prefered
    approach.

    Not adding these fields would mean that the drivers would need to parse the
    sk_buff data in hot-path, having a negative impact in the performance.

    Adding in sk_buff a pointer to the skbuff of the inner packet made sense, but
    would be a complicated change as assumptions needed to be made with regards to
    helper functions such as skb_clone() skb_copy(). Also code for the existing
    encapsulation protocols (such as VXLAN and IP GRE) had to be reworked, so the
    decision was to have the simple approach of adding these three fields.

    v2 Makes sure that checksumming for IP GRE does not take place if the offload flag is set in the skb's netdev features


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