APPLIED: [SRU][F:linux-bluefield][PATCH v2 0/1] UBUNTU: SAUCE: mlxbf_gige: clear valid_polarity upon open

[Luke Nowakowski-Krijger]

Applied to focal/linux-bluefield

Thanks!
- Luke

On Wed, Sep 8, 2021 at 8:57 AM David Thompson <davthompson at nvidia.com>
wrote:

> BugLink: https://bugs.launchpad.net/bugs/1942932
>
> SRU Justification:
>
> [Impact]
> * The oob_net0 interface, managed by the mlxbf_gige driver, will be
>   up and enabled but can stop processing received packets if three
>   specific conditions occur:
>   1) driver has received more than (N * RxRingSize) packets but less
>      than (N+1 * RxRingSize) packets where N is an odd number.
>      Note: the command "ethtool -g oob_net0" will display the current
>      receive ring size, which currently defaults to 128.
>   2) the driver's interface was disabled via "ifconfig oob_net0 down"
>      during the window described in #1.
>   3) the driver's interface is re-enabled via "ifconfig oob_net0 up"
>
>   Without this fix, the driver needs to be unloaded and re-loaded
>   to correct this condition.
>
> [Fix]
> * The fix is to ensure that the driver's "valid_polarity" field
>   is cleared during the open() method so that it always matches
>   the receive polarity used by hardware.
>
> [Test Case]
> * To test this fix, need to send in a specific number of packets to
>   the "oob_net0" interface, then issue "ifconfig oob_net0 down" to
>   disable the interface.  A subsequent "ifconfig oob_net0 up" command
>   will succesfully bring up the "oob_net0" interface and start the
>   processing of received packets.
>
> [Regression Potential]
> * There is low risk of this fix causing any problems.
>
> [Other]
> * n/a
>
> David Thompson (1):
>   UBUNTU: SAUCE: mlxbf_gige: clear valid_polarity upon open
>
>  drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> --
> 2.30.1
>
>
> --
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> kernel-team at lists.ubuntu.com
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>
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