linux-kernel - Re: [PATCH v4 4/7] can: Kconfig: add CONFIG_CAN_RX

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Date:   Sat, 4 Jun 2022 21:14:10 +0900
From:   Vincent MAILHOL <mailhol.vincent@...adoo.fr>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     linux-can@...r.kernel.org, linux-kernel@...r.kernel.org,
        Max Staudt <max@...as.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v4 4/7] can: Kconfig: add CONFIG_CAN_RX_OFFLOAD

On Sat. 4 June 2022 at 20:22, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> On 03.06.2022 19:28:45, Vincent Mailhol wrote:
> > Only a few drivers rely on the CAN rx offload framework (as of the
> > writing of this patch, only three: flexcan, ti_hecc and
> > mcp251xfd). Give the option to the user to deselect this features
> > during compilation.
> >
> > The drivers relying on CAN rx offload are in different sub
> > folders. All of these drivers get tagged with "select CAN_RX_OFFLOAD"
> > so that the option is automatically enabled whenever one of those
> > driver is chosen.
> >
> > Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> > ---
> >  drivers/net/can/Kconfig               | 16 ++++++++++++++++
> >  drivers/net/can/dev/Makefile          |  2 ++
> >  drivers/net/can/spi/mcp251xfd/Kconfig |  1 +
> >  3 files changed, 19 insertions(+)
> >
> > diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
> > index 8f3b97aea638..1f1d81da1c8c 100644
> > --- a/drivers/net/can/Kconfig
> > +++ b/drivers/net/can/Kconfig
> > @@ -102,6 +102,20 @@ config CAN_CALC_BITTIMING
> >
> >         If unsure, say Y.
> >
> > +config CAN_RX_OFFLOAD
> > +     bool "CAN RX offload"
> > +     default y
> > +     help
> > +       Framework to offload the controller's RX FIFO during one
> > +       interrupt. The CAN frames of the FIFO are read and put into a skb
> > +       queue during that interrupt and transmitted afterwards in a NAPI
> > +       context.
> > +
> > +       The additional features selected by this option will be added to the
> > +       can-dev module.
> > +
> > +       If unsure, say Y.
> > +
> >  config CAN_AT91
> >       tristate "Atmel AT91 onchip CAN controller"
> >       depends on (ARCH_AT91 || COMPILE_TEST) && HAS_IOMEM
> > @@ -113,6 +127,7 @@ config CAN_FLEXCAN
> >       tristate "Support for Freescale FLEXCAN based chips"
> >       depends on OF || COLDFIRE || COMPILE_TEST
> >       depends on HAS_IOMEM
> > +     select CAN_RX_OFFLOAD
> >       help
> >         Say Y here if you want to support for Freescale FlexCAN.
> >
> > @@ -162,6 +177,7 @@ config CAN_SUN4I
> >  config CAN_TI_HECC
> >       depends on ARM
> >       tristate "TI High End CAN Controller"
> > +     select CAN_RX_OFFLOAD
> >       help
> >         Driver for TI HECC (High End CAN Controller) module found on many
> >         TI devices. The device specifications are available from www.ti.com
> > diff --git a/drivers/net/can/dev/Makefile b/drivers/net/can/dev/Makefile
> > index b8a55b1d90cd..5081d8a3be57 100644
> > --- a/drivers/net/can/dev/Makefile
> > +++ b/drivers/net/can/dev/Makefile
> > @@ -11,3 +11,5 @@ can-dev-$(CONFIG_CAN_NETLINK) += netlink.o
> >  can-dev-$(CONFIG_CAN_NETLINK) += rx-offload.o
>              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Do you want to remove this?

Absolutely. As you probably guessed, this is just a leftover.

> >
> >  can-dev-$(CONFIG_CAN_CALC_BITTIMING) += calc_bittiming.o
> > +
> > +can-dev-$(CONFIG_CAN_RX_OFFLOAD) += rx-offload.o
> > diff --git a/drivers/net/can/spi/mcp251xfd/Kconfig b/drivers/net/can/spi/mcp251xfd/Kconfig
> > index dd0fc0a54be1..877e4356010d 100644
> > --- a/drivers/net/can/spi/mcp251xfd/Kconfig
> > +++ b/drivers/net/can/spi/mcp251xfd/Kconfig
> > @@ -2,6 +2,7 @@
> >
> >  config CAN_MCP251XFD
> >       tristate "Microchip MCP251xFD SPI CAN controllers"
> > +     select CAN_RX_OFFLOAD
> >       select REGMAP
> >       select WANT_DEV_COREDUMP
> >       help
>
> I remember I've given you a list of drivers needing RX offload, I
> probably missed the m_can driver. Feel free to squash this patch:

Added it to v5.

This went through the cracks when testing. Thanks for catching this!

> --- a/drivers/net/can/dev/Makefile
> +++ b/drivers/net/can/dev/Makefile
> @@ -8,7 +8,6 @@ can-dev-$(CONFIG_CAN_NETLINK) += bittiming.o
>  can-dev-$(CONFIG_CAN_NETLINK) += dev.o
>  can-dev-$(CONFIG_CAN_NETLINK) += length.o
>  can-dev-$(CONFIG_CAN_NETLINK) += netlink.o
> -can-dev-$(CONFIG_CAN_NETLINK) += rx-offload.o
>
>  can-dev-$(CONFIG_CAN_CALC_BITTIMING) += calc_bittiming.o
>
> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
> index 45ad1b3f0cd0..fc2afab36279 100644
> --- a/drivers/net/can/m_can/Kconfig
> +++ b/drivers/net/can/m_can/Kconfig
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  menuconfig CAN_M_CAN
>         tristate "Bosch M_CAN support"
> +       select CAN_RX_OFFLOAD
>         help
>           Say Y here if you want support for Bosch M_CAN controller framework.
>           This is common support for devices that embed the Bosch M_CAN IP.
>
> Marc
>
> --
> Pengutronix e.K.                 | Marc Kleine-Budde           |
> Embedded Linux                   | https://www.pengutronix.de  |
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