On 2019-01-05 9:14 a.m., Mark Lord wrote: > A couple of years back, I reported data corruption resulting from > a change in kernel 3.16 which enabled hardware checksums in the r8152 driver. > This was happening on an embedded system that was using a r8152 USB dongle. > > At the time, it was very difficult to figure out what could possibly be causing it, > other than that re-enabling software checksums prevented corrupted packets from > resulting in more serious issues. > > Since that time, more and more reports of similar corruption and issues > have been trickling in. Eg. > > https://lore.kernel.org/patchwork/patch/873920/ Forgot to include this link (below) where people still have the issue even with the driver workaround. Switching to software checksums "fixes" it: https://bugzilla.redhat.com/show_bug.cgi?id=1460789 > > Note that there are reports in the thread above that the issues > are not limited to only the built-in ethernet chip of the dock. > > There is even now a special hack in the upstream r8152.c to attempt to detect > a Dell TB16 dock and disable RX Aggregation in the driver to prevent such issues. > > Well.. I have a WD15 dock, not a TB16, and that same hack also catches my dock > in its net: > > [5.794641] usb 4-1.2: Dell TB16 Dock, disable RX aggregation > > So one issue is that the code is not correctly identifying the dock, > and the WD15 is claimed to be immune from the r8152 issues. > > One of the symptoms of the r8152 issue, reported by Ansis Atteka, > were messages like this: > > xhci_hcd 0000:39:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 13 > comp_code 1 > > I just got that exact message above, with the r8152 in my 1-day old WD15 dock, > with the TB16 "workaround" enabled in Linux kernel 4.20.0. > >>From this I conclude that the workaround is not 100% complete yet. > -- Mark Lord Real-Time Remedies Inc. mlord@xxxxxxxxx
