BCM4401 driver

From: Bruce Cran (bruce_at_cran.org.uk)
Date: 07/28/03

  • Next message: Paulo Roberto: "vpo in ECP" 
    Date: Mon, 28 Jul 2003 18:55:26 +0100
To: freebsd-hackers@freebsd.org

    I realise that there's a 'beta' FreeBSD driver out for this card, and I've
    been attempting to learn the kernel interfaces such as bus_dma and mbuf
    handling to debug it, but without much success. On my Dell, it seems to
    mostly work if I set the number of RX descriptors very low, around 5, but at
    the default of 200 the network stalls with invalid packets. Running a
    tcpdump on the interface shows that, with 5 descriptors, there's an occasional
    bad packet, but it doesn't stop any network access working. With 200, I get
    loads of bad packets, where tcpdump shows the mac addresses (the ethernet
    header I guess) quite a few bytes
    into the packet. I recently ran the system with the driver preloaded, and
    after a while it locked the system up, spamming me with 'bcm0: discarding frame
    w/o ethernet header (len 4294967296 pktlen 4294967296)'. It looks as though
    there's either a problem with where the chip is putting the data, or
    something's wrong with the mbuf handling, but which only gets triggered after
    a while. Does anyone know enough about
    network drivers to know what the problem might be?
    It would be great to have this card supported, and it seems that the driver
    is very near to being working, it just needs a bit more debugging work
    done on it. 

    --
Bruce Cran
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  • Next message: Paulo Roberto: "vpo in ECP"

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