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Joe Damato says: ==================== mlx5: Add netdev-genl queue stats Welcome to v5. Switched from RFC to just a v5, because I think this is pretty close. Minor changes from v4 summarized below in the changelog. Note that my NIC does not seem to support PTP and I couldn't get the mlnx-tools mlnx_qos script to work, so I was only able to test the following cases: - device up at boot - adjusting queue counts - device down (e.g. ip link set dev eth4 down) Please see the commit message of patch 2/2 for more details on output and test cases. rfcv4 thread: https://lore.kernel.org/linux-kernel/20240604004629.299699-1-jdamato@fastly.com/T/ rfcv4 -> v5: - Patch 1/2: change variable name 'mlx5e_qid' to 'txq_ix'. - Patch 2/2: - remove logic in mlx5e_get_queue_stats_rx for PTP. PTP RX are always reported in base. - report PTP TX in mlx5e_get_base_stats only if: - PTP has ever been opened, and - either PTP is NULL (closed) or the MLX5E_PTP_STATE_TX bit in its state is not set Otherwise, PTP TX will be reported when the txq_ix is passed into mlx5e_get_queue_stats_tx rfcv3 -> rfcv4: - Patch 1/2 now creates a mapping (priv->txq2sq_stats) which maps txq indices to sq_stats structures so stats can be accessed directly. This mapping is kept up to date along side txq2sq. - Patch 2/2: - All mutex_lock/unlock on state_lock has been dropped. - mlx5e_get_queue_stats_rx now uses ASSERT_RTNL() and has a special case for PTP. If PTP was ever opened, is currently opened, and the channel index matches, stats for PTP RX are output. - mlx5e_get_queue_stats_tx rewritten to use priv->txq2sq_stats. No corner cases are needed here because any txq idx (passed in as i) will have an up to date mapping in priv->txq2sq_stats. - mlx5e_get_base_stats: - in the RX case: - iterates from [params.num_channels, stats_nch) collecting stats. - if ptp was ever opened but is currently closed, add the PTP stats. - in the TX case: - handle 2 cases: - the channel is available, so sum only the unavailable TCs [mlx5e_get_dcb_num_tc, max_opened_tc). - the channel is unavailable, so sum all TCs [0, max_opened_tc). - if ptp was ever opened but is currently closed, add the PTP sq stats. v2 -> rfcv3: - Added patch 1/2 which creates some helpers for computing the txq_ix and ch_ix/tc_ix. - Patch 2/2 modified in several ways: - Fixed variable declarations in mlx5e_get_queue_stats_rx to be at the start of the function. - mlx5e_get_queue_stats_tx rewritten to access sq stats directly by using the helpers added in the previous patch. - mlx5e_get_base_stats modified in several ways: - Took the state_lock when accessing priv->channels. - For the base RX stats, code was simplified to call mlx5e_get_queue_stats_rx instead of repeating the same code. - For the base TX stats, I attempted to implement what I think Tariq suggested in the previous thread: - for available channels, only unavailable TC stats are summed - for unavailable channels, all stats for TCs up to max_opened_tc are summed. v1 - > v2: - Essentially a full rewrite after comments from Jakub, Tariq, and Zhu. ==================== 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 reStructuredText 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.