net/mlx5e: Support TX packet copy into WQE
AKA inline WQE. A TX latency optimization to save data gather DMA reads. Controlled by ETHTOOL_TX_COPYBREAK. Signed-off-by: NAchiad Shochat <achiad@mellanox.com> Signed-off-by: NAmir Vadai <amirv@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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