net: TX_RING and packet mmap
New packet socket feature that makes packet socket more efficient for transmission. - It reduces number of system call through a PACKET_TX_RING mechanism, based on PACKET_RX_RING (Circular buffer allocated in kernel space which is mmapped from user space). - It minimizes CPU copy using fragmented SKB (almost zero copy). Signed-off-by:Johann Baudy <johann.baudy@gnu-log.net> Signed-off-by:
David S. Miller <davem@davemloft.net>
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