netdev - Re: [net-next RFC PATCH 0/4] net: dsa: qca8k: code split for qca8k

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Date:   Mon, 18 Jul 2022 20:35:04 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [net-next RFC PATCH 0/4] net: dsa: qca8k: code split for qca8k

On Mon, Jul 18, 2022 at 04:46:20PM +0200, Christian Marangi wrote:
> On Sat, Jul 16, 2022 at 07:49:54PM +0200, Christian Marangi wrote:
> > This is posted as an RFC as it does contain changes that depends on a
> > regmap patch. The patch is here [1] hoping it will get approved.
> > 
> > If it will be NACKed, I will have to rework this and revert one of the
> > patch that makes use of the new regmap bulk implementation.
> >
> 
> The regmap patch that this series depends on has been accepted but needs
> some time to be put in linux-next. Considering the comments from the
> code move, is it urgent to have the changes done or we can wait for the
> regmap patch to get applied?
> 
> (this was asked from the regmap maintainer so here is the question)

If I understand correctly, what you're saying is that the regmap_bulk_read()
change from patch 2/4 (net: dsa: qca8k: convert to regmap read/write API)
won't work correctly without the regmap dependency, and would introduce
a regression in the driver, right?

If so, I would prefer getting the patches merged linearly and not in
parallel, in other words either Mark provides a branch to pull into
net-next or you wait until the merge window opens and then closes, which
means a couple of weeks.

The fact that in linux-next things would work isn't enough, since on
net-next they would still be broken.

> > Anyway, this is needed ad ipq4019 SoC have an internal switch that is
> > based on qca8k with very minor changes. The general function is equal.
> > 
> > Because of this we split the driver to common and specific code.
> > 
> > As the common function needs to be moved to a different file to be
> > reused, we had to convert every remaining user of qca8k_read/write/rmw
> > to regmap variant.
> > We had also to generilized the special handling for the ethtool_stats
> > function that makes use of the autocast mib. (ipq4019 will have a
> > different tagger and use mmio so it could be quicker to use mmio instead
> > of automib feature)
> > And we had to convert the regmap read/write to bulk implementation to
> > drop the special function that makes use of it. This will be compatible
> > with ipq4019 and at the same time permits normal switch to use the eth
> > mgmt way to send the entire ATU table read/write in one go.
> > 
> > (the bulk implementation could not be done when it was introduced as
> > regmap didn't support at times bulk read/write without a bus)
> > 
> > [1] https://lore.kernel.org/lkml/20220715201032.19507-1-ansuelsmth@gmail.com/