netdev - Re: [RFC net-next 4/9] net: bridge: switchdev: Forward offloading

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Date:   Thu, 6 May 2021 14:01:13 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     Ido Schimmel <idosch@...sch.org>, davem@...emloft.net,
        kuba@...nel.org, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, roopa@...dia.com, nikolay@...dia.com,
        jiri@...nulli.us, stephen@...workplumber.org,
        netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [RFC net-next 4/9] net: bridge: switchdev: Forward offloading

On Mon, May 03, 2021 at 10:53:36AM +0200, Tobias Waldekranz wrote:
> On Sun, May 02, 2021 at 18:04, Ido Schimmel <idosch@...sch.org> wrote:
> > On Mon, Apr 26, 2021 at 07:04:06PM +0200, Tobias Waldekranz wrote:
> >> +static void nbp_switchdev_fwd_offload_add(struct net_bridge_port *p)
> >> +{
> >> +	void *priv;
> >> +
> >> +	if (!(p->dev->features & NETIF_F_HW_L2FW_DOFFLOAD))
> >> +		return;
> >> +
> >> +	priv = p->dev->netdev_ops->ndo_dfwd_add_station(p->dev, p->br->dev);
> >
> > Some changes to team/bond/8021q will be needed in order to get this
> > optimization to work when they are enslaved to the bridge instead of the
> > front panel port itself?
> 
> Right you are. We should probably do something similar to the
> switchdev_handle_port_* family of helpers that could be reused in
> stacked devices. I will look at it for v1.

Makes sense, issuing a switchdev notifier of some sort will allow the
switchdev driver to act upon the bridge's request for a net device
belonging to a different driver.