netdev - Re: [PATCH v2 net-next 01/10] net: switchdev: remove vid_begin -> vid

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Date:   Wed, 6 Jan 2021 19:15:59 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vadym Kochan <vkochan@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Ivan Vecera <ivecera@...hat.com>
Subject: Re: [PATCH v2 net-next 01/10] net: switchdev: remove vid_begin ->
 vid_end range from VLAN objects

On Wed, Jan 06, 2021 at 07:08:18PM +0200, Ido Schimmel wrote:
> On Wed, Jan 06, 2021 at 03:09:57PM +0200, Vladimir Oltean wrote:
> > Let's go off and finish the job of commit 29ab586c3d83 by deleting the
> > bogus iteration through the VLAN ranges from the drivers. Some aspects
> > of this feature never made too much sense in the first place. For
> > example, what is a range of VLANs all having the BRIDGE_VLAN_INFO_PVID
> > flag supposed to mean, when a port can obviously have a single pvid? The
> > switchdev drivers have so far interpreted this to mean that the last
> > VLAN in the range should be the only one which should get programmed
> > with that attribute.
> 
> See commit 6623c60dc28e ("bridge: vlan: enforce no pvid flag in vlan
> ranges")

No, I agree, but still it changes nothing in terms of the hoops that a
driver must go through. It should still only program vlan->vid_end as
pvid either way. Which is strikingly odd.

> > Of the existing switchdev pieces of hardware, it appears that only
> > Mellanox Spectrum supports offloading more than one VLAN at a time.
> > I have kept that code internal to the driver, because there is some more
> > bookkeeping that makes use of it, but I deleted it from the switchdev
> > API. But since the switchdev support for ranges has already been de
> > facto deleted by a Mellanox employee and nobody noticed for 4 years, I'm
> > going to assume it's not a biggie.
> 
> Which code are you referring to?

mlxsw_sp_port_vlan_set

> For the switchdev and mlxsw parts:
> 
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> 
> I applied the series to our queue, so I should have regression results
> tomorrow

Thanks. Could you wait for me to send a v3 though, with that small fixup
in mv88e6xxx? I'm sure it will raise some red flags for your testing too.