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    SubjectRe: [patch 2.4.28-pre3] 3c59x: resync with 2.6
    On Fri, Oct 08, 2004 at 12:13:07PM -0400, John W. Linville wrote:
    > Backport of current 3c59x driver (minus EISA/sysfs stuff) from 2.6 to
    > 2.4. This should ease further maintenance in 2.4.
    > ---
    > I've been chasing some 3c59x driver problems on both 2.4.x and 2.6.x
    > kernels. The 3c59x driver was pretty far out of sync between the two
    > trees, so I thought it made sense to sync them back up.

    Ah, if someone's looking at the 3c59x driver then please look into the
    NWAY autonegotiation code - even maybe update it to use mii.c.

    Currently 3c59x is rather buggy - it's a fairly simple bug. Consider

    # mii-tool -v
    eth0: negotiated 100baseTx-HD, link ok
    product info: TDK 78Q2120 rev 11
    basic mode: autonegotiation enabled
    basic status: autonegotiation complete, link ok
    capabilities: 100baseTx-HD 10baseT-HD
    advertising: 100baseTx-HD 10baseT-HD
    link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

    and then wonder why we end up like this:

    eth0: Setting full-duplex based on MII #0 link partner capability of 45e1.

    Obviously completely bogus. Luckily, there isn't that much traffic
    to this card _and_ it's connected to a switch so it doesn't interfere
    much with other network traffic. However, it is _dog_ slow when doing
    large transfers to/from it.

    FYI, it's:

    04:00.0 Ethernet controller: 3Com Corporation 3c575 [Megahertz] 10/100 LAN CardBus (rev 01)

    aka 3CCFE575BT. The BT version only has a HD-capable MII transceiver,
    whereas the CT version has a FD-capable MII transceiver fitted.

    Russell King
    Linux kernel 2.6 ARM Linux -
    maintainer of: 2.6 PCMCIA -
    2.6 Serial core
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