Re: [PATCH] Fix TCP/UDP checksums on the Broadcom SB-1

[Ralf Baechle <ralf@linux-mips.org>]

On Tue, Sep 20, 2005 at 07:26:54AM -0700, Michael Uhler wrote:

> For what it's worth, the 64-bit architecture, both prior to and with MIPS64,
> has always required that 64-bit GPRs be sign-extended when used with 32-bit
> operations.  I'm surprised that this wasn't seen on more 64-bit CPUs than
> just the SB1.

Usually resends will paper over this kind of problem.  It's only a question
of time until they succeed for any protocol that changed the packet
content sufficiently to make the checksum work eventually.  But of course
performance will suffer and as a matter of statistics certain IP address
and port ranges are going to suffer more than others.

  Ralf