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    SubjectRe: net: skge breakage on 2.6.24-rc1
    On Wed, Nov 07, 2007 at 11:46:21PM +0200, Heikki Orsila wrote:
    > After some bisecting, I found that net skge driver broke on
    >
    > commit 7fb7ac241162dc51ec0f7644d4a97b2855213c32
    >
    > My network card is:
    >
    > 0000:00:0e.0 Ethernet controller: 3Com Corporation 3c940 10/100/1000Base-T [Marvell] (rev 12)
    >
    > Linux cheradenine 2.6.24-rc1-dirty #15 Wed Nov 7 23:39:28 EET 2007 x86_64 GNU/Linux

    Sorry, forgot to say what the problem is. Doing

    nc host port < /dev/zero

    on a sending machine (not skge) to an skge machine that is receiving:

    nc -l -p port >/dev/null

    with ~60 MiB/s speed, causes the interface go malfunct. A slow
    transfer doesn't cause a problem.

    Also, after some fiddling, I noticed that not changing the register
    write order on patch:

    + skge_write32(hw, RB_ADDR(q, RB_END), end);
    skge_write32(hw, RB_ADDR(q, RB_WP), start);
    skge_write32(hw, RB_ADDR(q, RB_RP), start);
    - skge_write32(hw, RB_ADDR(q, RB_END), end);

    fixes the visible effect.. Possibly not the root cause of the problem,
    but changing the order back fixes networking here.

    --
    Heikki Orsila Barbie's law:
    heikki.orsila@iki.fi "Math is hard, let's go shopping!"
    http://www.iki.fi/shd
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