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5651cd3c43
When the controller supports less queues than requested, we
should make sure that queue mapping does the right thing and
not assume that all queues are available. This fixes a crash
when the controller supports less queues than requested.
The rules are:
1. if no write/poll queues are requested, we assign the available queues
to the default queue map. The default and read queue maps share the
existing queues.
2. if write queues are requested:
- first make sure that read queue map gets the requested
nr_io_queues count
- then grant the default queue map the minimum between the requested
nr_write_queues and the remaining queues. If there are no available
queues to dedicate to the default queue map, fallback to (1) and
share all the queues in the existing queue map.
3. if poll queues are requested:
- map the remaining queues to the poll queue map.
Also, provide a log indication on how we constructed the different
queue maps.
Reported-by: Harris, James R <james.r.harris@intel.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Tested-by: Jim Harris <james.r.harris@intel.com>
Cc: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
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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.