netdev - Re: [Uclinux-dist-devel] [PATCH 1/2] net: dsa: introduce STPID switch tagging handling code

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Message-ID: <AANLkTim1gbnH99GC_dVL8uevRgCRsn7dvAJ_rX-2Xgon@mail.gmail.com>
Date:	Wed, 21 Jul 2010 11:29:30 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	Karl Beldan <karl.beldan@...il.com>, netdev@...r.kernel.org,
	Graf Yang <graf.yang@...log.com>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Uclinux-dist-devel] [PATCH 1/2] net: dsa: introduce STPID switch 
	tagging handling code

On Wed, Jul 21, 2010 at 11:02, Lennert Buytenhek wrote:
> On Wed, Jul 21, 2010 at 09:37:21AM -0400, Mike Frysinger wrote:
>> +     source_port = dsa_header[1] & 0x03;
>> +     if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
>> +             goto out_drop;
>> +
>> +     if (((dsa_header[0] & ETH_P_8021QH) == ETH_P_8021QH) &&
>
> This is bogus -- what it does is:
>
>        if ((dsa_header[0] & 0x81) == 0x81)
>
> It doesn't look like you need to mask here at all.

where does it say dsa_header[0] will always have 0x81 set ?
-mike
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