netdev - Re: [PATCH v2 1/5] can: enable multi-queue for SocketCAN devices

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Date:   Fri, 20 Jul 2018 16:34:48 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Mark Jonas <mark.jonas@...bosch.com>,
        Wolfgang Grandegger <wg@...ndegger.com>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, hs@...x.de, yi.zhu5@...bosch.com,
        petar.petrovic2@...bosch.com, stephan.baetge@...bosch.com,
        andy.shevchenko@...il.com, socketcan@...tkopp.net,
        o.rempel@...gutronix.de
Subject: Re: [PATCH v2 1/5] can: enable multi-queue for SocketCAN devices

On 06/13/2018 04:37 PM, Mark Jonas wrote:
> From: Zhu Yi <yi.zhu5@...bosch.com>
> 
> The existing SocketCAN implementation provides alloc_candev() to
> allocate a CAN device using a single Tx and Rx queue. This can lead to
> priority inversion in case the single Tx queue is already full with low
> priority messages and a high priority message needs to be sent while the
> bus is fully loaded with medium priority messages.
> 
> This problem can be solved by using the existing multi-queue support of
> the network subsytem. The commit makes it possible to use multi-queue in
> the CAN subsystem in the same way it is used in the Ethernet subsystem
> by adding an alloc_candev_mqs() call and accompanying macros. With this
> support a CAN device can use multi-queue qdisc (e.g. mqprio) to avoid
> the aforementioned priority inversion.
> 
> The exisiting functionality of alloc_candev() is the same as before.
> 
> CAN devices need to have prioritized multiple hardware queues or are
> able to abort waiting for arbitration to make sensible use of
> multi-queues.
> 
> Signed-off-by: Zhu Yi <yi.zhu5@...bosch.com>
> Signed-off-by: Mark Jonas <mark.jonas@...bosch.com>
> Reviewed-by: Heiko Schocher <hs@...x.de>

Applied to linux-can-next.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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