netdev - Re: [PATCH net-next, 2/2] hv_netvsc: Sync offloading features to VF NIC

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Date:   Fri, 6 Sep 2019 21:25:48 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     "sashal@...nel.org" <sashal@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>, vkuznets <vkuznets@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Bloch <markb@...lanox.com>
Subject: Re: [PATCH net-next, 2/2] hv_netvsc: Sync offloading features to VF
 NIC

On Thu, 5 Sep 2019 23:07:32 +0000, Haiyang Zhang wrote:
> > On Fri, 30 Aug 2019 03:45:38 +0000, Haiyang Zhang wrote:  
> > > VF NIC may go down then come up during host servicing events. This
> > > causes the VF NIC offloading feature settings to roll back to the
> > > defaults. This patch can synchronize features from synthetic NIC to
> > > the VF NIC during ndo_set_features (ethtool -K), and
> > > netvsc_register_vf when VF comes back after host events.
> > >
> > > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > > Cc: Mark Bloch <markb@...lanox.com>  
> > 
> > If we want to make this change in behaviour we should change net_failover
> > at the same time.  
> 
> After checking the net_failover, I found it's for virtio based SRIOV, and very 
> different from what we did for Hyper-V based SRIOV.
> 
> We let the netvsc driver acts as both the synthetic (PV) driver and the transparent 
> bonding master for the VF NIC. But net_failover acts as a master device on top 
> of both virtio PV NIC, and VF NIC. And the net_failover doesn't implemented 
> operations, like ndo_set_features.
> So the code change for our netvsc driver cannot be applied to net_failover driver.
> 
> I will re-submit my two patches (fixing the extra tab in the 1st one as you pointed 
> out). Thanks!

I think it stands to reason that two modules which implement the same
functionality behave the same.