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SubjectRe: [PATCH] Proper perfect filter setup for xircom_tulip_cb.c
On Wed, 6 Jun 2001, Keith Owens wrote:

> Nicely spotted. The X3201-3 Software Specification says nothing about
> the segment bits for the filter, instead the information is tucked away
> in the 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller Hardware
> Reference Manual. So Xircom have a software specification manual that
> does not include the full software spec, oh the horrors.

If that were the only thing missing... At least I was able to catch it by
simply being tidy -- I was going over the control bits to see which of
them need to be/make sense to be set.

But what about setting the hash (the imperfect filter)? The 21143 docs say
the *upper* 9 bits of the crc32 should be used; the Xircom docs are
completely silent, and the driver currently uses the *lower* 9 bits of the

Oh, and for that matter, the hash is currently broken on the Xircom:
unlike the 21143, the Xircom has 4 perfect filter slots in hash mode, not
one, but the driver ignores this fact. The hash layout is also severely
brain-damaged... I'll look into fixing it tomorrow -- by simply copying
the fix from the patch I wrote for the other xircom driver (xircom_cb). :-)


It is better to keep your mouth shut and be thought a fool,
than to open it and remove all doubt.

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