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commit1d5558b1f0upstream. Once driver detects a command interface command timeout, it warns the user and returns timeout error to the caller. In such case, the entry of the command is not evacuated (because only real event interrupt is allowed to clear command interface entry). If the HW event interrupt of this entry will never arrive, this entry will be left unused forever. Command interface entries are limited and eventually we can end up without the ability to post a new command. In addition, if driver will not consume the EQE of the lost interrupt and rearm the EQ, no new interrupts will arrive for other commands. Add a resiliency mechanism for manually polling the command EQ in case of a command timeout. In case resiliency mechanism will find non-handled EQE, it will consume it, and the command interface will be fully functional again. Once the resiliency flow finished, wait another 5 seconds for the command interface to complete for this command entry. Define mlx5_cmd_eq_recover() to manage the cmd EQ polling resiliency flow. Add an async EQ spinlock to avoid races between resiliency flows and real interrupts that might run simultaneously. Fixes:e126ba97db("mlx5: Add driver for Mellanox Connect-IB adapters") Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com> Cc: Timo Rothenpieler <timo@rothenpieler.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.