linux-kernel - Re: [PATCH 2/2] netdev: bfin_mac: enable VLAN support in Blackfin MAC driver

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Date:	Thu, 08 Jan 2009 10:55:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	cooloney@...nel.org
Cc:	jeff@...zik.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, graf.yang@...log.com
Subject: Re: [PATCH 2/2] netdev: bfin_mac: enable VLAN support in Blackfin
 MAC driver

From: Bryan Wu <cooloney@...nel.org>
Date: Thu,  8 Jan 2009 00:14:39 +0800

> +#define VLAN_ETHER_TYPE 0x8100

Please use ETH_P_8021Q from linux/if_ether.h instead of inventing
your own definition.

> +	/* The legal length of the frame is increased to 1538 bytes */
> +	/*bfin_write_EMAC_VLAN2(VLAN_ETHER_TYPE);*/

Please do not add code that is just going to be commented
out and not used.

Also, I disagree with the:

+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)

conditional.  Probably this part of the chip should be programmed
unconditionally.

We can get VLAN packets received and sent, using AF_PACKET
sockets, for example.  The chip should still respect those
even if VLAN proper is not being utilized.
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