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    SubjectRE: [PATCH net 1/2] r8152: fix the sw rx checksum is unavailable
    Date
    Mark Lord [mailto:mlord@pobox.com]
    > Sent: Thursday, November 24, 2016 8:31 PM
    [...]
    > Nope. Guard zones did not fix it, so it's probably not a prefetch issue.
    > Oddly, adding a couple of memory barriers to specific places in the driver
    > does help, A LOT. Still not 100%, but it did pass 1800 reboot tests over night
    > with only three bad rx_desc's reported.
    >
    > That's a new record here for the driver using kmalloc'd buffers,
    > and put reliability on par with using non-cacheable buffers.
    >
    > Any way we look at it though, the chip/driver are simply unreliable,
    > and relying upon hardware checksums (which fail due to the driver
    > looking at garbage rather than the checksum bits) leads to data corruption.

    I don't think the garbage results from our driver or device.
    If it is the issue about memory, I think the host driver ought
    to deal with it, because it handles the DMA.

    Besides, it doesn't seem to occur for all platforms. I have
    tested the iperf more than 26 hours, and it still works fine.
    I think I would get the same result on x86 or x86_64 platform.

    Best Regards,
    Hayes

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