linux-kernel - Re: Misalignment, MIPS, and ip

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Date:   Wed, 7 Dec 2016 10:47:16 -0800
From:   Dave Taht <dave.taht@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Netdev <netdev@...r.kernel.org>, linux-mips@...ux-mips.org,
        LKML <linux-kernel@...r.kernel.org>,
        WireGuard mailing list <wireguard@...ts.zx2c4.com>
Subject: Re: Misalignment, MIPS, and ip_hdr(skb)->version

The openwrt tree has long contained a set of patches that correct for
unaligned issues throughout the linux network stack.

https://git.lede-project.org/?p=openwrt/source.git;a=blob;f=target/linux/ar71xx/patches-4.4/910-unaligned_access_hacks.patch;h=b4b749e4b9c02a74a9f712a2740d63e554de5c64;hb=ee53a240ac902dc83209008a2671e7fdcf55957a

unaligned access traps in the packet processing path on certain versions of
the mips architecture is horrifically bad. I had kind of hoped these
patches in some form would have made it upstream by now. (or the
arches that have the issue retired, I think it's mostly just mips24k)