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    SubjectRe: [PATCH] sky2: receive dma mapping error handling
    On 02/03/10 10:25, Stephen Hemminger wrote:
    > On Wed, 03 Feb 2010 10:23:01 -0800
    > "Justin P. Mattock"<justinmattock@gmail.com> wrote:
    >
    >> On 02/03/10 09:07, Michael Breuer wrote:
    >>> On 02/03/2010 11:56 AM, Stephen Hemminger wrote:
    >>>> On Wed, 03 Feb 2010 11:47:19 -0500
    >>>> Michael Breuer<mbreuer@majjas.com> wrote:
    >>>>
    >>>>> Tracked this down. The status being returned is 0x3c0080 - good flow
    >>>>> control packets. Nothing is actually being dropped (confirmed by packet
    >>>>> trace on switch compared with packet trace on server).
    >>>>>
    >>>>> I whipped up a trivial patch to not count these as dropped packets and
    >>>>> will post to netdev.
    >>>>>
    >>>>> I'm not really sure what the driver should be doing in this case, but
    >>>>> resubmit seems to work.
    >>>> Looks like a flow control negotiation issue. You probably turned off
    >>>> flow control on the Linux side, but the switch is still doing flow
    >>>> control.
    >>>>
    >>> According to the driver:
    >>> Feb 3 12:03:02 mail kernel: sky2 eth0: Link is up at 1000 Mbps, full
    >>> duplex, flow control both
    >>>
    >>> So if the rx flow control packet status is due to flow control being
    >>> disabled, then there's a different issue.
    >>>
    >>>
    >>> --
    >>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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    >>> Please read the FAQ at http://www.tux.org/lkml/
    >>>
    >>
    >>
    >> hmm.. after an hour or so I'm not seeing anything.
    >> from what I remember I turned the machine on in the
    >> hotel, then left the system there as I went out for a few hours
    >> (so maybe I need to wait).
    >>
    >> Anyways I did keep dmesg of when this occurred, basically
    >> the log was spammed with these:
    >>
    >> [ 863.294057] sky2 eth0: rx error, status 0x580002 length 88
    >> [ 865.646645] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 1286.420471] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 1286.499459] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 1746.903826] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 1754.263692] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 1755.309360] sky2 eth0: rx error, status 0x680002 length 104
    >> [ 2213.256294] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 2219.653342] sky2 eth0: rx error, status 0x580002 length 88
    >> [ 2221.673601] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 2679.654655] sky2 eth0: rx error, status 0x680002 length 104
    >> [ 2692.315058] sky2 eth0: rx error, status 0x500002 length 80
    >> [ 2694.349612] sky2 eth0: rx error, status 0x580002 length 88
    >> [ 2703.676717] sky2 eth0: rx error, status 0x700002 length 112
    >> [ 2703.826375] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 3187.504843] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 3189.560744] sky2 eth0: rx error, status 0x600002 length 96
    >> [ 3672.475719] sky2 eth0: rx error, status 0x680002 length 104
    >> [ 3676.696959] sky2 eth0: rx error, status 0x680002 length 104
    >>
    >> but while using the system with this, I didn't notice anything
    >> out of the ordinary.
    >> (if this fires off I can try a bisect for you guys, but right now
    >> since I'm not seeing anything, might be a different story);
    >>
    >
    > You were on a crappy hotel switch. Those are all CRC errors.
    >
    >
    >


    alright.. makes sense cause I'm not getting
    any of this now at home.

    Justin P. Mattock


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