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Antoine Tenart says:
====================
net: xps: improve the xps maps handling
This series aims at fixing various issues with the xps code, including
out-of-bound accesses and use-after-free. While doing so we try to
improve the xps code maintainability and readability.
The main change is moving dev->num_tc and dev->nr_ids in the xps maps, to
avoid out-of-bound accesses as those two fields can be updated after the
maps have been allocated. This allows further reworks, to improve the
xps code readability and allow to stop taking the rtnl lock when
reading the maps in sysfs. The maps are moved to an array in net_device,
which simplifies the code a lot.
One future improvement may be to remove the use of xps_map_mutex from
net/core/dev.c, but that may require extra care.
Thanks!
Antoine
Since v3:
- Removed the 3 patches about the rtnl lock and __netif_set_xps_queue
as there are extra issues. Those patches were not tied to the
others, and I'll see want can be done as a separate effort.
- One small fix in patch 12.
Since v2:
- Patches 13-16 are new to the series.
- Fixed another issue I found while preparing v3 (use after free of
old xps maps).
- Kept the rtnl lock when calling netdev_get_tx_queue and
netdev_txq_to_tc.
- Use get_device/put_device when using the sb_dev.
- Take the rtnl lock in mlx5 and virtio_net when calling
netif_set_xps_queue.
- Fixed a coding style issue.
Since v1:
- Reordered the patches to improve readability and avoid introducing
issues in between patches.
- Use dev_maps->nr_ids to allocate the mask in xps_queue_show but
still default to nr_cpu_ids/dev->num_rx_queues in xps_queue_show
when dev_maps hasn't been allocated yet for backward
compatibility.:w
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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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.