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Tony Nguyen says: ==================== Intel Wired LAN Driver Updates 2025-01-06 (igb, igc, ixgbe, ixgbevf, i40e, fm10k) For igb: Sriram Yagnaraman and Kurt Kanzenbach add support for AF_XDP zero-copy. Original cover letter: The first couple of patches adds helper functions to prepare for AF_XDP zero-copy support which comes in the last couple of patches, one each for Rx and TX paths. As mentioned in v1 patchset [0], I don't have access to an actual IGB device to provide correct performance numbers. I have used Intel 82576EB emulator in QEMU [1] to test the changes to IGB driver. The tests use one isolated vCPU for RX/TX and one isolated vCPU for the xdp-sock application [2]. Hope these measurements provide at the least some indication on the increase in performance when using ZC, especially in the TX path. It would be awesome if someone with a real IGB NIC can test the patch. AF_XDP performance using 64 byte packets in Kpps. Benchmark: XDP-SKB XDP-DRV XDP-DRV(ZC) rxdrop 220 235 350 txpush 1.000 1.000 410 l2fwd 1.000 1.000 200 AF_XDP performance using 1500 byte packets in Kpps. Benchmark: XDP-SKB XDP-DRV XDP-DRV(ZC) rxdrop 200 210 310 txpush 1.000 1.000 410 l2fwd 0.900 1.000 160 [0]: https://lore.kernel.org/intel-wired-lan/20230704095915.9750-1-sriram.yagnaraman@est.tech/ [1]: https://www.qemu.org/docs/master/system/devices/igb.html [2]: https://github.com/xdp-project/bpf-examples/tree/master/AF_XDP-example Subsequent changes and information can be found here: https://lore.kernel.org/intel-wired-lan/20241018-b4-igb_zero_copy-v9-0-da139d78d796@linutronix.de/ Yue Haibing converts use of ERR_PTR return to traditional error code which resolves a smatch warning. For igc: Song Yoong Siang allows for the XDP program to be hot-swapped. Yue Haibing converts use of ERR_PTR return to traditional error code which resolves a smatch warning. Joe Damato adds sets IRQ and queues to NAPI instances to allow for reporting via netdev-genl API. For ixgbe: Yue Haibing converts use of ERR_PTR return to traditional error code which resolves a smatch warning. For ixgbevf: Yue Haibing converts use of ERR_PTR return to traditional error code which resolves a smatch warning. For i40e: Alex implements "mdd-auto-reset-vf" private flag to automatically reset VFs when encountering an MDD event. For fm10k: Dr. David Alan Gilbert removes an unused function. ==================== Link: https://patch.msgid.link/20250106221929.956999-1-anthony.l.nguyen@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.