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Message-ID: <a8943b5a-63d4-e4d4-a08c-f4b2fd955ffc@gmail.com>
Date: Fri, 8 Jan 2021 17:53:58 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc: 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>,
Petr Machata <petrm@...dia.com>
Subject: Re: [PATCH v4 net-next 05/11] net: switchdev: remove the transaction
structure from port attributes
On 1/8/2021 4:01 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> Since the introduction of the switchdev API, port attributes were
> transmitted to drivers for offloading using a two-step transactional
> model, with a prepare phase that was supposed to catch all errors, and a
> commit phase that was supposed to never fail.
>
> Some classes of failures can never be avoided, like hardware access, or
> memory allocation. In the latter case, merely attempting to move the
> memory allocation to the preparation phase makes it impossible to avoid
> memory leaks, since commit 91cf8eceffc1 ("switchdev: Remove unused
> transaction item queue") which has removed the unused mechanism of
> passing on the allocated memory between one phase and another.
>
> It is time we admit that separating the preparation from the commit
> phase is something that is best left for the driver to decide, and not
> something that should be baked into the API, especially since there are
> no switchdev callers that depend on this.
>
> This patch removes the struct switchdev_trans member from switchdev port
> attribute notifier structures, and converts drivers to not look at this
> member.
>
> In part, this patch contains a revert of my previous commit 2e554a7a5d8a
> ("net: dsa: propagate switchdev vlan_filtering prepare phase to
> drivers").
>
> For the most part, the conversion was trivial except for:
> - Rocker's world implementation based on Broadcom OF-DPA had an odd
> implementation of ofdpa_port_attr_bridge_flags_set. The conversion was
> done mechanically, by pasting the implementation twice, then only
> keeping the code that would get executed during prepare phase on top,
> then only keeping the code that gets executed during the commit phase
> on bottom, then simplifying the resulting code until this was obtained.
> - DSA's offloading of STP state, bridge flags, VLAN filtering and
> multicast router could be converted right away. But the ageing time
> could not, so a shim was introduced and this was left for a further
> commit.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Acked-by: Jiri Pirko <jiri@...dia.com>
> Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de> # hellcreek
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org> # RTL8366RB
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
--
Florian
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