netdev - Re: [Intel-wired-lan] [PATCH iwl-net v4] i40e: fix hot issue NVM content is corrupted after nvmupdate

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Date: Tue, 18 Jun 2024 15:49:54 +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 v4] i40e: fix hot issue NVM
 content is corrupted after nvmupdate

On 6/18/24 15:21, Aleksandr Loktionov wrote:
> 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

nvmupdate64 is not an upstream tool, but it's fine to mention it here,
as we don't have a better alternative for i40e as of now

> 
> 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
> 
> But 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.

this paragraph tells more about nvmupdate tool problems that the driver

> 
> 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

all or just this one that you are fixing here?

> 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.
> 
> Remove wrong EIO to EGAIN conversion and pass all errors as is.
> 
> Fixes: 230f3d53a547 ("i40e: remove i40e_status")

That is a proper tag, and the description makes it clear that we want
the patch finally applied, thank you for the efforts to make it well
described.

> Co-developed-by: Kelvin Kang <kelvin.kang@...el.com>
> Signed-off-by: Kelvin Kang <kelvin.kang@...el.com>

this 2 line removal was indeed developed by two of you?

> Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> ---
> v3->v4 commit message update

Please fix the subject line too, it's what will be the most frequently
read part of your work, and with stay in git for decades. You could use:
i40e: fix wrong error code replacement

and add link in changelog section:
v4: 
https://lore.kernel.org/netdev/20240618132111.3193963-1-aleksandr.loktionov@intel.com/T/#u

> 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;
>