netdev - Re: [PATCH V2 3/3] bnxt_en: Add support to collect crash dump via ethtool

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Date:   Mon, 21 Oct 2019 16:00:26 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     Sheetal Tigadoli <sheetal.tigadoli@...adcom.com>,
        Rafał Miłecki <zajec5@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>,
        Rajan Vaja <rajan.vaja@...inx.com>,
        Scott Branden <scott.branden@...adcom.com>,
        Ray Jui <ray.jui@...adcom.com>,
        Vikram Prakash <vikram.prakash@...adcom.com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Michael Chan <michael.chan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vikas Gupta <vikas.gupta@...adcom.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        tee-dev@...ts.linaro.org, bcm-kernel-feedback-list@...adcom.com,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH V2 3/3] bnxt_en: Add support to collect crash dump via
 ethtool

On Mon, 21 Oct 2019 10:05:18 +0530, Vasundhara Volam wrote:
> On Fri, Oct 18, 2019 at 10:31 PM Jakub Kicinski wrote:
> > On Fri, 18 Oct 2019 12:04:35 +0530, Vasundhara Volam wrote:  
> > > On Fri, Oct 18, 2019 at 12:52 AM Jakub Kicinski wrote:  
> > > > On Thu, 17 Oct 2019 17:31:22 +0530, Sheetal Tigadoli wrote:  
> > > > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > > > > index 51c1404..1596221 100644
> > > > > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > > > > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > > > > @@ -3311,6 +3311,23 @@ static int bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
> > > > >       return rc;
> > > > >  }
> > > > >
> > > > > +static int bnxt_set_dump(struct net_device *dev, struct ethtool_dump *dump)
> > > > > +{
> > > > > +     struct bnxt *bp = netdev_priv(dev);
> > > > > +
> > > > > +#ifndef CONFIG_TEE_BNXT_FW
> > > > > +     return -EOPNOTSUPP;
> > > > > +#endif  
> > > >
> > > >         if (!IS_ENABLED(...))
> > > >                 return x;
> > > >
> > > > reads better IMHO  
> > > Okay.
> > >  
> > > >
> > > > But also you seem to be breaking live dump for systems with
> > > > CONFIG_TEE_BNXT_FW=n  
> > > Yes, we are supporting set_dump only if crash dump is supported.  
> >
> > It's wrong.  
>
> Sorry not very clear. You are saying that support set_dump all the
> time and return error, if the config option is not enabled? If yes, I
> will modify the same way as it makes sense.

Yes, I think users can expect that set will work even if there is only
one dump type/flag supported. Technically implementing the set is not
required from functional perspective, however, we could imagine
software that always does a set before a get, and the set should not
fail.