netdev - Re: [RFC] net/hsr: Add support for IEC 62439-3 High-availability Seamless Redundancy

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Message-ID: <20120403113751.21fd0b17@s6510.linuxnetplumber.net>
Date:	Tue, 3 Apr 2012 11:37:51 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Arvid Brodin <arvid.brodin@...a.com>
Cc:	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
	Bruno Ferreira <balferreira@...glemail.com>
Subject: Re: [RFC] net/hsr: Add support for IEC 62439-3 High-availability
 Seamless Redundancy

On Tue, 27 Mar 2012 15:20:45 +0200
Arvid Brodin <arvid.brodin@...a.com> wrote:

> +config NONSTANDARD_HSR
> +	bool "HSR: Use efficient tag (breaks HSR standard, read help!)"
> +	depends on HSR
> +	---help---
> +	  The HSR standard specifies a 6-byte HSR tag to be inserted into the
> +	  transmitted network frames. This breaks the 32-bit alignment that the
> +	  Linux network stack relies on, and would cause kernel panics on
> +	  certain architectures. To avoid this, the whole frame payload is
> +	  memmoved 2 bytes on reception on these architectures - which is very
> +	  inefficient!

This option won't fly. Don't do it.
If you need to copy/realign packets on some architecture the stack
should be changed to handle it.
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