Call skb_frag_dma_map multiple times if tx length is greater than
device max and avoid processing tx ring until entire packet has been
sent.
Signed-off-by: NIgor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: NPavel Belous <pavel.belous@aquantia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>