netdev - Re: [RFC net-next v2 3/3] devlink: add more failure modes

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Date:   Thu, 11 Mar 2021 16:23:09 +0200
From:   Eran Ben Elisha <eranbe@...dia.com>
To:     <f242ed68-d31b-527d-562f-c5a35123861a@...el.com>,
        <netdev@...r.kernel.org>
CC:     <jiri@...nulli.us>, <saeedm@...dia.com>,
        <andrew.gospodarek@...adcom.com>, <jacob.e.keller@...el.com>,
        <guglielmo.morandin@...adcom.com>, <eugenem@...com>,
        <eranbe@...lanox.com>, Jakub Kicinski <kuba@...nel.org>,
        Aya Levin <ayal@...dia.com>, Moshe Shemesh <moshe@...dia.com>
Subject: Re: [RFC net-next v2 3/3] devlink: add more failure modes



On 3/11/2021 5:26 AM, Jakub Kicinski wrote:
>>> Pending vendors adding the right reporters. <<

Would you like Nvidia to reply with the remedy per reporter or to 
actually prepare the patch?

> 
> Extend the applicability of devlink health reporters
> beyond what can be locally remedied. Add failure modes
> which require re-flashing the NVM image or HW changes.
> 
> The expectation is that driver will call
> devlink_health_reporter_state_update() to put hardware
> health reporters into bad state.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>   include/uapi/linux/devlink.h | 7 +++++++
>   net/core/devlink.c           | 3 +--
>   2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
> index 8cd1508b525b..f623bbc63489 100644
> --- a/include/uapi/linux/devlink.h
> +++ b/include/uapi/linux/devlink.h
> @@ -617,10 +617,17 @@ enum devlink_port_fn_opstate {
>    * @DL_HEALTH_STATE_ERROR: error state, running health reporter's recovery
>    *			may fix the issue, otherwise user needs to try
>    *			power cycling or other forms of reset
> + * @DL_HEALTH_STATE_BAD_IMAGE: device's non-volatile memory needs
> + *			to be re-written, usually due to block corruption
> + * @DL_HEALTH_STATE_BAD_HW: hardware errors detected, device, host
> + *			or the connection between the two may be at fault
>    */
>   enum devlink_health_state {
>   	DL_HEALTH_STATE_HEALTHY,
>   	DL_HEALTH_STATE_ERROR,
> +
> +	DL_HEALTH_STATE_BAD_IMAGE,
> +	DL_HEALTH_STATE_BAD_HW,
>   };
>   
>   /**
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 09d77d43ff63..4a9fa6288a4a 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -6527,8 +6527,7 @@ void
>   devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
>   				     enum devlink_health_state state)
>   {
> -	if (WARN_ON(state != DL_HEALTH_STATE_HEALTHY &&
> -		    state != DL_HEALTH_STATE_ERROR))
> +	if (WARN_ON(state > DL_HEALTH_STATE_BAD_HW))
>   		return;
>   
>   	if (reporter->health_state == state)
> 

devlink_health_reporter_recover() requires an update as well.
something like:

@@ -6346,8 +6346,15 @@ devlink_health_reporter_recover(struct 
devlink_health_reporter *reporter,
  {
         int err;

-   if (reporter->health_state == DL_HEALTH_STATE_HEALTHY)
+ switch (reporter->health_state) {
+ case DL_HEALTH_STATE_HEALTHY:
                 return 0;
+ case DL_HEALTH_STATE_ERROR:
+         break;
+ case DL_HEALTH_STATE_BAD_IMAGE:
+ case DL_HEALTH_STATE_BAD_HW:
+         return -EOPNOTSUPP;
+ }

         if (!reporter->ops->recover)
                 return -EOPNOTSUPP;