netdev - Re: [PATCH v4] Ethernet driver for the WIZnet W5300 chip

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Date:	Tue, 27 Mar 2012 22:35:45 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	msink@...monline.ru
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	joe@...ches.com, eric.dumazet@...il.com
Subject: Re: [PATCH v4] Ethernet driver for the WIZnet W5300 chip

From: Mike Sinkovsky <msink@...monline.ru>
Date: Mon, 26 Mar 2012 15:07:56 +0600

> +/*
> + * Frame size is hardwired to 1514 bytes (including header),
> + *  => MTU for 802.1Q frames must be set to 1500-4 = 1496
> + */
> +#define W5300_HARD_MTU		1500

I've told you that you must set the VLAN challenged feature flag
(NETIF_F_VLAN_CHALLENGED) for devices which have this restriction.

Just set that, and remove this comment, since the feature bit setting
documents this restriction fully and perfectly.
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