ibmveth: Implement multi queue on xmit
The `ndo_start_xmit` function is protected by a spinlock on the tx queue being used to transmit the skb. Allow concurrent calls to `ndo_start_xmit` by using more than one tx queue. This allows for greater throughput when several jobs are trying to transmit data. Introduce 16 tx queues (leave single rx queue as is) which each correspond to one DMA mapped long term buffer. Signed-off-by: Nick Child <nnac123@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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