Re: [PATCH net v4] net: mana: Add support to process throttled EQEs

[sashiko-bot@kernel.org]

> When an event queue nears full, the hardware coalesces the per-CQ
> GDMA_EQE_COMPLETION notifications into a single throttle EQE (type 4)
> that carries no cq_id. The driver does not handle this event type, so
> it falls through to the default case and is dropped. Any CQ whose
> completion notification was replaced by the throttle EQE can remain
> unserviced, causing its queue to stall.
> 
> This was observed internally as a TX stall:
> 
>   ens1: NETDEV WATCHDOG: CPU: 45: transmit queue 1 timed out 15133 ms
>   mana 7870:00:00.0: HWC: Request timed out: 60000 ms
>   mana 7870:00:00.0: Gf stats wk handler: gf stats query timed out.
>   ens1: NETDEV WATCHDOG: CPU: 20: transmit queue 0 timed out 15859 ms
>   ens1: NETDEV WATCHDOG: CPU: 15: transmit queue 0 timed out 31731 ms
>   ens1: NETDEV WATCHDOG: CPU: 21: transmit queue 0 timed out 47603 ms
> [ ... ]
> - Add a throttle eqe counter per queue.
> 
> Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)")
> Cc: stable@vger.kernel.org
> Signed-off-by: Sahil Chandna <sahilchandna@linux.microsoft.com>

Sashiko has reviewed this patch and found no issues.

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