Re: Checksum on Alpha
Artur Skawina (skawina@geocities.com)
Wed, 02 Jun 1999 13:27:04 +0200
Bharadwaj Yadavalli wrote:
>
> Can somebody kindly explain me why the implementation of
> csum_partial_copy_from_user()
> in linux/arch/alpha/lib/csum_partial_copy.c returns a 16-bit
> checksum whereas its x86
> counterpart in linux/linux/arch/i386/lib/checksum.S returns
> 32-bit checksum?
it's only a partial checksum - the checksum can be computed
from multiples of 16 bits, which then have to be added together
to get the final value. see csum_fold() and rfc1071.
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