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** Tags added: verification-needed-bionic

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  qlcnic: Firmware aborts/hangs in QLogic NIC

Status in linux package in Ubuntu:
Status in linux source package in Bionic:
  Fix Committed

Bug description:

  * In multi-queue configurations for qlcnic driver, there is a corner case
    in which TX queue zero is used at same time for regular data transmission
    by one CPU while another uses the same queue descriptor for MAC 
  * When such "race" indeed happens, it could lead to TX queue zero corruption,
    triggering as net result firmware aborts/hangs out of nowhere. The following
    kernel log messages were collected during the corruption event:
    qlcnic 0000:01:00.0: Pause control frames disabled on all ports
    qlcnic 0000:01:00.0: firmware hang detected
    qlcnic 0000:01:00.0: Dumping hw/fw registers
    PEG_HALT_STATUS1: 0x40001502, PEG_HALT_STATUS2: 0x3de7a0,
    PEG_NET_0_PC: 0x6d268, PEG_NET_1_PC: 0x6d2ac,
    PEG_NET_2_PC: 0x149, PEG_NET_3_PC: 0x6e105,
    PEG_NET_4_PC: 0x1e00b
    qlcnic 0000:01:00.0: Detected state change from DEV_NEED_RESET, skipping 
ack check

  * The following device is known to suffer from the issue (lspci output),
    although a whole class of devices (named 82XX series from the vendor) are
    susceptible to this:
    01:00.0 Ethernet controller [0200]: QLogic Corp. cLOM8214 1/10GbE 
Controller [1077:8020]

  * The fix is the following patch, present in mainline kernel as well as
    in supported stable branches:
    c333fa0c4f22 ("qlcnic: fix Tx descriptor corruption on 82xx devices").
    Link for the patch in Linus tree:

  [Test Case]

  * Unfortunately this is not easy to reproduce; we have a user report of
    the issue with a pretty reliable reproducer - user is running a NFS
    workload on top of the above PCI adapter. His problem goes away with
    the patch proposed here to SRU. His problem happens in both kernels 4.4
    and 4.15, and the patch fixes it for both of them.
    (Notice this is a Bionic-only SRU, since Ubuntu 4.4 kernel got the patch
    from Greg's supported stable branch).
  [Regression Potential]

  * The patch scope is restricted to a single driver, and the code itself
    is self-contained - basically a restriction to specific tx_ring when
    setting filters. There is potential for regressions in this path for
    the driver which could cause different firmware issues for example,
    but the user testing exhibited great reliability - without the patch
    issue happens after ~6h of machine boot. With the patch the machine ran
    for more than 8 days without issues.

  * Also the patch is present in mainline kernel as well as supported
    stable branches, and is already present in Ubuntu 4.4 kernel.

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