tg3: Add skb->xmit_more support
Ring TX doorbell only if xmit_more is not set or the queue is stopped. Suggested-by: NDaniel Borkmann <dborkman@redhat.com> Signed-off-by: NPrashant Sreedharan <prashant@broadcom.com> Signed-off-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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