[PATCH v4] net/netvsc: fix number Tx queues > Rx queues

[Stephen Hemminger]

On Mon, 15 Apr 2024 14:40:44 +0000
Alan Elder <alan.elder at microsoft.com> wrote:

> 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 due to accessing beyond the end of the dev->data->rx_queues[] array.  
> 
> #0 rte_spinlock_trylock (sl = invalid address) at /include/rte_spinlock.h L63
> #1  hn_process_events at /drivers/net/netvsc/hn_rxtx.c L 1129
> #2  hn_xmit_pkts at /drivers/net/netvsc/hn_rxtx.c L1553
> 
> 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>
> ---
> v4:
> * Include segfault core stack in commit message
> 
> v3:
> * Handle case of Rx queue creation failure in hn_dev_tx_queue_setup.
> * Re-use rx queue if it has already been allocated.
> * Don't allocate an mbuf if pool is NULL.  This avoids segfault if RSS
>   configuration is incorrect.
> 
> v2:
> * Remove function declaration for static non-member function
> 

This version of the patch is garbled in patchwork which means the CI test
never ran because patch would not apply.

You need cleanup and resubmit it.