netdev - Re: [PATCH 1/1] Documentation: networking: document CAN ISO-TP

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Message-ID: <20240319120625.GI185808@kernel.org>
Date: Tue, 19 Mar 2024 12:06:25 +0000
From: Simon Horman <horms@...nel.org>
To: Francesco Valla <valla.francesco@...il.com>
Cc: Oliver Hartkopp <socketcan@...tkopp.net>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	fabio@...aril.me, linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Documentation: networking: document CAN ISO-TP

On Wed, Mar 13, 2024 at 11:34:31PM +0100, Francesco Valla wrote:
> Document basic concepts, APIs and behaviour of the CAN ISO-TP (ISO
> 15765-2) stack.
> 
> Signed-off-by: Francesco Valla <valla.francesco@...il.com>

Hi Francesco,

As it looks like there will be a v2 of this patchset
please consider running checkpatch.pl --codespell
and addressing the warnings it reports.

...

> +Transport protocol and associated frame types
> +---------------------------------------------
> +
> +When transmitting data using the ISO-TP protocol, the payload can either fit
> +inside one single CAN message or not, also considering the overhead the protocol
> +is generating and the optional extended addressing. In the first case, the data
> +is transmitted at once using a so-called Single Frame (SF). In the second case,
> +ISO-TP defines a multi-frame protocol, in which the sender asks (through a First
> +Frame - FF) to the receiver the maximum supported size of a macro data block
> +(``blocksize``) and the minimum time time between the single CAN messages
> +composing such block (``stmin``). Once these informations have been received,

nit: Once this information has

> +the sender starts to send frames containing fragments of the data payload
> +(called Consecutive Frames - CF), stopping after every ``blocksize``-sized block
> +to wait confirmation from the receiver (which should then send a Flow Control
> +frame - FC - to inform the sender about its availability to receive more data).
> +

...