[PATCH net-next] ibmvnic: Defer tx completion processing using a wait queue

[Eric Dumazet]

On Tue, 2016-04-12 at 14:38 -0500, John Allen wrote:
> Moves tx completion processing out of interrupt context, deferring work
> using a wait queue. With this work now deferred, we must account for the
> possibility that skbs can be sent faster than we can process completion
> requests in which case the tx buffer will overflow. If the tx buffer is
> full, ibmvnic_xmit will return NETDEV_TX_BUSY and stop the current tx
> queue. Subsequently, the queue will be restarted in ibmvnic_complete_tx
> when all pending tx completion requests have been cleared.

1) Why is this needed ?

2) If it is needed, why is this not done in a generic way, so that other
drivers can use this ?

Thanks.