netdev - Re: [PATCH net-next] cxgb4vf: Add ethtool private flags for changing force_link

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Message-ID: <20180921104629.GA20315@chelsio.com>
Date:   Fri, 21 Sep 2018 16:16:31 +0530
From:   Arjun Vynipadath <arjun@...lsio.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, dt@...lsio.com,
        nirranjan@...lsio.com, indranil@...lsio.com,
        Casey Leedom <leedom@...lsio.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>
Subject: Re: [PATCH net-next] cxgb4vf: Add ethtool private flags for changing
 force_link_up

On Tuesday, September 09/18/18, 2018 at 11:39:14 -0700, Jakub Kicinski wrote:
> On Tue, 18 Sep 2018 18:37:23 +0530, Arjun Vynipadath wrote:
> > Forcing link up of virtual interfaces even when physical link is down
> > causes packet drops and ping failures during bonding failover. Hence
> > adding a ethtool private flag to toggle force_link_up whenever required.
> > 
> > Signed-off-by: Arjun Vynipadath <arjun@...lsio.com>
> > Signed-off-by: Casey Leedom <leedom@...lsio.com>
> > Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
> 
> Could you describe how this mechanism relates to the existing
> ndo_set_vf_link_state, which you seem to not make use of:
> 
> $ git grep ndo_set_vf_link_state -- drivers/net/ethernet/chelsio/
> $ 
> 
> I understand you're configuring the setting from the VF side, but the
> question, as always, is: why ;)
Hi Jakub,
ndo_set_vf_link_state can't be presently used in our case.
We dont have firmware support to communicate the link flags set through
ndo_set_vf_link_state from pf (cxgb4) driver to vf (cxgb4vf) driver.

Thanks,
Arjun.