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net: fec: Add Scatter/gather support
Add Scatter/gather support for FEC. This feature allows to improve outbound throughput performance. Tested on imx6dl sabresd board: Running iperf tests shows a 55.4% improvement. $ ethtool -K eth0 sg off $ iperf -c 10.192.242.167 -t 3 & [ 3] local 10.192.242.108 port 52618 connected with 10.192.242.167 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 3.0 sec 99.5 MBytes 278 Mbits/sec $ ethtool -K eth0 sg on $ iperf -c 10.192.242.167 -t 3 & [ 3] local 10.192.242.108 port 52617 connected with 10.192.242.167 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 3.0 sec 154 MBytes 432 Mbits/sec CC: Li Frank <[email protected]> Signed-off-by: Fugang Duan <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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