linux-kernel - RE: [PATCH v2 2/2] dpaa_eth: add ethtool coalesce control

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Date:   Mon, 19 Nov 2018 07:11:00 +0000
From:   Madalin-cristian Bucur <madalin.bucur@....com>
To:     David Miller <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Leo Li <leoyang.li@....com>, Roy Pledge <roy.pledge@....com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 2/2] dpaa_eth: add ethtool coalesce control

> -----Original Message-----
> From: David Miller <davem@...emloft.net>
> Sent: Saturday, November 17, 2018 5:42 AM
> To: Madalin-cristian Bucur <madalin.bucur@....com>
> Subject: Re: [PATCH v2 2/2] dpaa_eth: add ethtool coalesce control
> 
> From: Madalin Bucur <madalin.bucur@....com>
> Date: Tue, 13 Nov 2018 18:29:51 +0200
> 
> > +	for_each_cpu(cpu, cpus) {
> > +		portal = qman_get_affine_portal(cpu);
> > +		res = qman_portal_set_iperiod(portal, period);
> > +		if (res)
> > +			return res;
> > +		res = qman_dqrr_set_ithresh(portal, thresh);
> > +		if (res)
> > +			return res;
> 
> Nope, you can't do it like this.
> 
> If any intermediate change fails, you have to unwind all of the
> changes made up until that point.
> 
> Which means you'll have to store the previous setting somewhere
> and reinstall those saved values in the error path.

Thank you, I'll come back with a v3.

Madalin