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

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Date:   Thu, 11 Mar 2021 08:49:22 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eran Ben Elisha <eranbe@...dia.com>
Cc:     <f242ed68-d31b-527d-562f-c5a35123861a@...el.com>,
        <netdev@...r.kernel.org>, <jiri@...nulli.us>, <saeedm@...dia.com>,
        <andrew.gospodarek@...adcom.com>, <jacob.e.keller@...el.com>,
        <guglielmo.morandin@...adcom.com>, <eugenem@...com>,
        <eranbe@...lanox.com>, Aya Levin <ayal@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>
Subject: Re: [RFC net-next v2 3/3] devlink: add more failure modes

On Thu, 11 Mar 2021 16:23:09 +0200 Eran Ben Elisha wrote:
> 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?

You mean the patch adding .remedy? If you can that'd be helpful.

Or do you have HW error reporters to add?

> > 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;
> 

Thanks!