[PATCH v3] net/netvsc: fix number Tx queues > Rx queues

[Long Li]

> Subject: [PATCH v3] net/netvsc: fix number Tx queues > Rx queues
> 
> The previous code allowed the number of Tx queues to be set higher than the
> number of Rx queues.  If a packet was sent on a Tx queue with index
> >= number Rx queues there was a segfault.
> 
> This commit fixes the issue by creating an Rx queue for every Tx queue meaning
> that an event buffer is allocated to handle receiving Tx completion messages.
> 
> mbuf pool and Rx ring are not allocated for these additional Rx queues and RSS
> configuration ensures that no packets are received on them.
> 
> Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
> Cc: sthemmin at microsoft.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Alan Elder <alan.elder at microsoft.com>

Reviewed-by: Long Li <longli at microsoft.com>