RE: [PATCH net-next, v2] net: mana: Trigger VF reset/recovery on health check failure due to HWC timeout

[Haiyang Zhang]

> -----Original Message-----
> From: Dipayaan Roy <dipayanroy@xxxxxxxxxxxxxxxxxxx>
> Sent: Friday, February 27, 2026 3:15 AM
> To: KY Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang
> <haiyangz@xxxxxxxxxxxxx>; wei.liu@xxxxxxxxxx; Dexuan Cui
> <DECUI@xxxxxxxxxxxxx>; andrew+netdev@xxxxxxx; davem@xxxxxxxxxxxxx;
> edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx; pabeni@xxxxxxxxxx; leon@xxxxxxxxxx;
> Long Li <longli@xxxxxxxxxxxxx>; Konstantin Taranov
> <kotaranov@xxxxxxxxxxxxx>; horms@xxxxxxxxxx;
> shradhagupta@xxxxxxxxxxxxxxxxxxx; ssengar@xxxxxxxxxxxxxxxxxxx;
> ernis@xxxxxxxxxxxxxxxxxxx; Shiraz Saleem <shirazsaleem@xxxxxxxxxxxxx>;
> linux-hyperv@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; Dipayaan Roy
> <dipayanroy@xxxxxxxxxxxxx>
> Subject: [PATCH net-next, v2] net: mana: Trigger VF reset/recovery on
> health check failure due to HWC timeout
> 
> The GF stats periodic query is used as mechanism to monitor HWC health
> check. If this HWC command times out, it is a strong indication that
> the device/SoC is in a faulty state and requires recovery.
> 
> Today, when a timeout is detected, the driver marks
> hwc_timeout_occurred, clears cached stats, and stops rescheduling the
> periodic work. However, the device itself is left in the same failing
> state.
> 
> Extend the timeout handling path to trigger the existing MANA VF
> recovery service by queueing a GDMA_EQE_HWC_RESET_REQUEST work item.
> This is expected to initiate the appropriate recovery flow by suspende
> resume first and if it fails then trigger a bus rescan.
> 
> This change is intentionally limited to HWC command timeouts and does
> not trigger recovery for errors reported by the SoC as a normal command
> response.
> 
> Signed-off-by: Dipayaan Roy <dipayanroy@xxxxxxxxxxxxxxxxxxx>
> ---
> Changes in v2:
>   - Added common helper, proper clearing of gc flags.
> ---

Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Thanks.