Messages in this thread | | | Subject | RE: [PATCH 2.6.33 1/3] net: Micrel KSZ8841/2 PCI Ethernet driver | Date | Tue, 19 Jan 2010 16:34:38 -0800 | From | "Ha, Tristram" <> |
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Stephen Hemminger wrote: > On Tue, 19 Jan 2010 15:48:50 -0800 > "Ha, Tristram" <Tristram.Ha@Micrel.Com> wrote: > >> Stephen Hemminger wrote: >>>> Now for the driver implementation for STP support. I programmed >>>> the switch's static MAC table to always pass the following frames >>>> to the >>>> host: BPDU frames with specific multicast address, broadcast >>>> frames, unicast frames with the device bridge's MAC address, and >>>> multicast frames with ICMPv6 multicast address. All other frames >>>> are not >> passed >>>> to the host and are handled by the switch, forwarding each frame >>>> with its standard forwarding logic. The port can be shut off if it >>>> is blocked and those frames will not pass through that port. The >>>> host gets BPDU frames so that the bridge can determine each port's state. >>>> The other broadcast, unicast, and multicast frames passed to the >>>> host are necessary if some other network devices want to >>>> communicate with the host. As the forwarding is done by hardware >>>> rather than >> software, >>>> overall performance does increase. >>> >>> What about LACP needed by bridging? >>> >> >> I am not aware of LACP and do not know how this protocol works under >> bridging. If the requirement is certain multicast frames do not get >> forwarded and must pass to the host bridge, I can add those fixed >> multicast addresses. The static MAC table has 8 entries, so there are >> 4 more to use. > > Anything 01:80:C2:00:00:00 should go local host. > LACP is part of 802.3ad bonding and uses 01:80:C2:00:02 > > In general anything to 01:80:C2:00:00:XX is likely to be used by some IEEE 802 standard for link > only multicast.
If the strict requirement is to support all 01:80:C2:00:00:XX multicast addresses, my scheme will not work. It was designed only for STP, as most our customers request that feature.
I will pass your suggestions to our hardware engineers so that they can develop a better switch engine.
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