netdev - Re: [Intel-wired-lan] [PATCH iwl-net v5] i40e: fix: remove needless retries of NVM update

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Date: Wed, 26 Jun 2024 11:28:12 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	<anthony.l.nguyen@...el.com>
CC: <netdev@...r.kernel.org>, Kelvin Kang <kelvin.kang@...el.com>, "Arkadiusz
 Kubalewski" <arkadiusz.kubalewski@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>
Subject: Re: [Intel-wired-lan] [PATCH iwl-net v5] i40e: fix: remove needless
 retries of NVM update

On 6/25/24 20:49, Aleksandr Loktionov wrote:
> Remove wrong EIO to EGAIN conversion and pass all errors as is.
> 
> After commit 230f3d53a547 ("i40e: remove i40e_status"), which should only
> replace F/W specific error codes with Linux kernel generic, all EIO errors
> suddenly started to be converted into EAGAIN which leads nvmupdate to retry
> until it timeouts and sometimes fails after more than 20 minutes in the
> middle of NVM update, so NVM becomes corrupted.
> 
> The bug affects users only at the time when they try to update NVM, and
> only F/W versions that generate errors while nvmupdate. For example, X710DA2
> with 0x8000ECB7 F/W is affected, but there are probably more...
> 
> Command for reproduction is just NVM update:
>   ./nvmupdate64
> 
> In the log instead of:
>   i40e_nvmupd_exec_aq err I40E_ERR_ADMIN_QUEUE_ERROR aq_err I40E_AQ_RC_ENOMEM)
> appears:
>   i40e_nvmupd_exec_aq err -EIO aq_err I40E_AQ_RC_ENOMEM
>   i40e: eeprom check failed (-5), Tx/Rx traffic disabled
> 
> The problematic code did silently convert EIO into EAGAIN which forced
> nvmupdate to ignore EAGAIN error and retry the same operation until timeout.
> That's why NVM update takes 20+ minutes to finish with the fail in the end.
> 
> Fixes: 230f3d53a547 ("i40e: remove i40e_status")
> Co-developed-by: Kelvin Kang <kelvin.kang@...el.com>
> Signed-off-by: Kelvin Kang <kelvin.kang@...el.com>
> Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> ---
> v4->v5 commit message update
> https://lore.kernel.org/netdev/20240618132111.3193963-1-aleksandr.loktionov@intel.com/T/#u
> v3->v4 commit message update
> v2->v3 commit messege typos
> v1->v2 commit message update
> ---
>   drivers/net/ethernet/intel/i40e/i40e_adminq.h | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_adminq.h b/drivers/net/ethernet/intel/i40e/i40e_adminq.h
> index ee86d2c..55b5bb8 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_adminq.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e_adminq.h
> @@ -109,10 +109,6 @@ static inline int i40e_aq_rc_to_posix(int aq_ret, int aq_rc)
>   		-EFBIG,      /* I40E_AQ_RC_EFBIG */
>   	};
>   
> -	/* aq_rc is invalid if AQ timed out */
> -	if (aq_ret == -EIO)
> -		return -EAGAIN;
> -
>   	if (!((u32)aq_rc < (sizeof(aq_to_posix) / sizeof((aq_to_posix)[0]))))
>   		return -ERANGE;
>   

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>