netdev - Re: [RFC, PATCH] IPV6 : add 64 bits components in struct in6_addr to speedup ipv6_addr_equal() & ipv6_addr

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Message-Id: <20070430.115937.104035556.davem@davemloft.net>
Date:	Mon, 30 Apr 2007 11:59:37 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	brian.haley@...com
Cc:	dada1@...mosbay.com, yoshfuji@...ux-ipv6.org,
	netdev@...r.kernel.org
Subject: Re: [RFC, PATCH] IPV6 : add 64 bits components in struct in6_addr
 to speedup ipv6_addr_equal() & ipv6_addr_any()

From: Brian Haley <brian.haley@...com>
Date: Mon, 30 Apr 2007 12:27:07 -0400

> The problem is that drivers don't necessarily align the address on the 
> correct boundary, so on some 64-bit arches this could be fatal.  There's 
> ways around it since I did it in a previous life, but you'd need to copy 
> the addresses and hide them in the skb in the rare case, neither of 
> which is a great thing to do.

Yes, the majority of the network drivers are only ensuring 32-bit
alignment after the ethernet header currently on receive.  They
were designed with ipv4 in mind long ago and then the logic just
gets copied everywhere.
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