3Com 3c905C Tornado (newish 2.4.x) improper frame processing

3Com 3c905C Tornado (newish 2.4.x) improper frame processing

[Dax Kelson]

A frame with a destination address of FF:00:00:00:00:00 shouldn't be
processed, unless the card has been told to listen to that multicast
address.

Driver/Card information:
-------------------
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
00:10.0: 3Com PCI 3c905C Tornado at 0xe000. Vers LK1.1.1600:10.0 
3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78)
-------------------

I tried:

# ifconfig eth0 -mulicast

And STILL the frame was processed.

The linux/drivers/net/3c59x.c has this comment:

/* Pre-Cyclone chips have no documented multicast filter, so the only
   multicast setting is to receive all multicast frames.  At least
   the chip has a very clean way to set the mode, unlike many others. */

However, this card is Tornado, the latest rev, so this comment shouldn't
apply. 

The families go: Vortex -> Boomerang -> Cyclone -> Tornado

Also, I tried using the latest Donald Becker driver with the same
results:

(dmesg output from latest Donald Becker driver)

3c59x.c:v0.99X 6/21/2002 Donald Becker, becker@scyld.com
  http://www.scyld.com/network/vortex.html
eth0: 3Com 3c905C Tornado at 0xe000,  00:01:03:de:57:37, IRQ 7
  8K buffer 5:3 Rx:Tx split, autoselect/Autonegotiate interface.
  MII transceiver found at address 24, status 782d.
  Using bus-master transmits and whole-frame receives.

Re: 3Com 3c905C Tornado (newish 2.4.x) improper frame processing

[Andrew Morton]

Dax Kelson wrote:
> 
> A frame with a destination address of FF:00:00:00:00:00 shouldn't be
> processed, unless the card has been told to listen to that multicast
> address.
> 
> Driver/Card information:
> -------------------
> 3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
> 00:10.0: 3Com PCI 3c905C Tornado at 0xe000. Vers LK1.1.1600:10.0
> 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78)
> -------------------

There's a full implementation of hardware hashed filtering in
3com's GPL'ed 3c90x driver.  But nobody got around to pilfering
it.

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