linux-kernel - Re: [PATCH 3/5] ipmi:ipmb: Add initial support for IPMI over IPMB

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Date:   Mon, 4 Oct 2021 18:27:34 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     minyard@....org, openipmi-developer@...ts.sourceforge.net
Cc:     Andrew Manley <andrew.manley@...lingtech.com>,
        linux-kernel@...r.kernel.org, Corey Minyard <cminyard@...sta.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 3/5] ipmi:ipmb: Add initial support for IPMI over IPMB

Hi,

On 10/4/21 5:40 PM, minyard@....org wrote:
> From: Corey Minyard <cminyard@...sta.com>
> 
> This provides access to the management controllers on an IPMB bus to a
> device sitting on the IPMB bus.  It also provides slave capability to
> respond to received messages on the bus.
> 
> Signed-off-by: Corey Minyard <minyard@....org>
> Tested-by: Andrew Manley <andrew.manley@...lingtech.com>
> Reviewed-by: Andrew Manley <andrew.manley@...lingtech.com>
> ---
>   drivers/char/ipmi/Kconfig     |   9 +
>   drivers/char/ipmi/Makefile    |   1 +
>   drivers/char/ipmi/ipmi_ipmb.c | 510 ++++++++++++++++++++++++++++++++++
>   3 files changed, 520 insertions(+)
>   create mode 100644 drivers/char/ipmi/ipmi_ipmb.c
> 
> diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
> index 249b31197eea..1c92209f023b 100644
> --- a/drivers/char/ipmi/Kconfig
> +++ b/drivers/char/ipmi/Kconfig
> @@ -75,6 +75,15 @@ config IPMI_SSIF
>   	  have a driver that must be accessed over an I2C bus instead of a
>   	  standard interface.  This module requires I2C support.
>   
> +config IPMI_IPMB
> +       tristate 'IPMI IPMB interface'
> +       select I2C

How can this select I2C unconditionally? At this point we don't
even know if this platform has/supports I2C.

Ditto for IPMI_SSIF in the current Kconfig file, while
IPMB_DEVICE_INTERFACE depends on I2C (as it should IMO).



> +       help
> +	 Provides a driver for a system running right on the IPMB bus.
> +	 It supports normal system interface messages to a BMC on the IPMB
> +	 bus, and it also supports direct messaging on the bus using
> +	 IPMB direct messages.  This module requires I2C support.

<form-letter-bot>

Please follow coding-style for Kconfig files:

(from Documentation/process/coding-style.rst, section 10):

For all of the Kconfig* configuration files throughout the source tree,
the indentation is somewhat different.  Lines under a ``config`` definition
are indented with one tab, while help text is indented an additional two
spaces.

> +
>   config IPMI_POWERNV
>   	depends on PPC_POWERNV
>   	tristate 'POWERNV (OPAL firmware) IPMI interface'


> diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
> new file mode 100644
> index 000000000000..b10a1fd9c563
> --- /dev/null
> +++ b/drivers/char/ipmi/ipmi_ipmb.c
> @@ -0,0 +1,510 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * Driver to talk to a remote management controller on IPMB.
> + */
> +

[...]

> +
> +static int ipmi_ipmb_start_processing(void            *send_info,

Odd spacing/formatting above.

> +				      struct ipmi_smi *new_intf)
> +{
> +	struct ipmi_ipmb_dev *iidev = send_info;
> +
> +	iidev->intf = new_intf;
> +	iidev->ready = true;
> +	return 0;
> +}
> +
> +
> +static void ipmi_ipmb_sender(void                *send_info,

Ditto.

> +			     struct ipmi_smi_msg *msg)
> +{


-- 
~Randy