linux-kernel - Re: [PATCH 14/24] thunderbolt: Let the connection manager handle all notifications

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Date:   Wed, 24 May 2017 16:00:49 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>, Mario.Limonciello@...l.com,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/24] thunderbolt: Let the connection manager handle all
 notifications

On Thu, May 18, 2017 at 05:39:04PM +0300, Mika Westerberg wrote:
> @@ -320,18 +330,42 @@ static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
>  	}
>  
>  	frame->size -= 4; /* remove checksum */
> -	if (*(__be32 *) (pkg->buffer + frame->size)
> -			!= tb_crc(pkg->buffer, frame->size)) {
> -		tb_ctl_err(pkg->ctl,
> -			   "RX: checksum mismatch, dropping packet\n");
> -		goto rx;
> -	}
> +	crc32 = tb_crc(pkg->buffer, frame->size);
>  	be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4);
>  
> -	if (frame->eof == TB_CFG_PKG_EVENT) {
> -		tb_ctl_handle_plug_event(pkg->ctl, pkg);
> +	switch (frame->eof) {
> +	case TB_CFG_PKG_READ:
> +	case TB_CFG_PKG_WRITE:
> +	case TB_CFG_PKG_ERROR:
> +	case TB_CFG_PKG_OVERRIDE:
> +	case TB_CFG_PKG_RESET:
> +		if (*(__be32 *)(pkg->buffer + frame->size) != crc32) {
> +			tb_ctl_err(pkg->ctl,
> +				   "RX: checksum mismatch, dropping packet\n");
> +			goto rx;
> +		}

Any harm keeping the crc32 check above the switch/case statement?
(And thus also execute it for unknown packets?)


> +	case TB_CFG_PKG_EVENT:
> +		if (*(__be32 *)(pkg->buffer + frame->size) != crc32) {
> +			tb_ctl_err(pkg->ctl,
> +				   "RX: checksum mismatch, dropping packet\n");
> +			goto rx;
> +		}
> +		tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size);
> +		goto rx;
> +
> +	default:
> +		tb_ctl_dbg(pkg->ctl, "RX: unknown package %#x, dropping\n",

The packet / package terminology is a bit inconsistent here.
Andreas originally used package.  What's the term used by the TB spec?

Thanks,

Lukas