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

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Date:   Sat, 4 Jun 2022 13:22:27 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
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 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?

>  
>  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:

--- 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  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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