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Jakub Kicinski says: ==================== ethtool: rss: driver tweaks and netlink context dumps This series is a semi-related collection of RSS patches. Main point is supporting dumping RSS contexts via ethtool netlink. At present additional RSS contexts can be queried one by one, and assuming user know the right IDs. This series uses the XArray added by Ed to provide netlink dump support for ETHTOOL_GET_RSS. Patch 1 is a trivial selftest debug patch. Patch 2 coverts mvpp2 for no real reason other than that I had a grand plan of converting all drivers at some stage. Patch 3 removes a now moot check from mlx5 so that all tests can pass. Patch 4 and 5 make a bit used for context support optional, for easier grepping of drivers which need converting if nothing else. Patch 6 OTOH adds a new cap bit; some devices don't support using a different key per context and currently act in surprising ways. Patch 7 and 8 update the RSS netlink code to use XArray. Patch 9 and 10 add support for dumping contexts. Patch 11 and 12 are small adjustments to spec and a new test. I'm getting distracted with other work, so probably won't have the time soon to complete next steps, but things which are missing are (and some of these may be bad ideas): - better discovery Some sort of API to tell the user who many contexts the device can create. Upper bound, devices often share contexts between ports etc. so it's hard to tell exactly and upfront number of contexts for a netdev. But order of magnitude (4 vs 10s) may be enough for container management system to know whether to bother. - create/modify/delete via netlink The only question here is how to handle all the tricky IOCTL legacy. "No change" maps trivially to attribute not present. "reset" (indir_size = 0) probably needs to be a new NLA_FLAG? - better table size handling The current API assumes the LUT has fixed size, which isn't true for modern devices. We should have better APIs for the drivers to resize the tables, and in user facing API - the ability to specify pattern and min size rather than exact table expected (sort of like ethtool CLI already does). - recounted / socket-bound contexts Support for contexts which get "cleaned up" when their parent netlink socket gets closed. The major catch is that ntuple filters (which we don't currently track) depend on the context, so we need auto-removal for both. v5: - fix build v4: https://lore.kernel.org/20240809031827.2373341-1-kuba@kernel.org - adjust to the meaning of max context from net v3: https://lore.kernel.org/20240806193317.1491822-1-kuba@kernel.org - quite a few code comments and commit message changes - mvpp2: fix interpretation of max_context_id (I'll take care of the net -> net-next merge as needed) - filter by ifindex in the selftest v2: https://lore.kernel.org/20240803042624.970352-1-kuba@kernel.org - fix bugs and build in mvpp2 v1: https://lore.kernel.org/20240802001801.565176-1-kuba@kernel.org ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.