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Fri, 11 Oct 2024 09:01:11 +0000 (UTC) From: Kurt Kanzenbach Date: Fri, 11 Oct 2024 11:00:58 +0200 Message-Id: <20241011-b4-igb_zero_copy-v8-0-83862f726a9e@linutronix.de> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAErpCGcC/4XOwWrDMAwG4FcpPs/DTmI77NT3GKNYjtwIgl3sN E1b8u4TOewwOnb8JfT9eoqKhbCKj8NTFFyoUk4c+reDCKNPZ5Q0cBaNajrltJbQSTrD6YEln0K +3CWAU77VGEBFwWfgK0ooPoWRD9N1mnh4KRhp3Xs+Bd0mmXCdxRdvRqpzLvf9gcXs+7+7FiOVj G3sjNG6Ba2PE6XrXHKi9X3AHVzsf4hlpIMItneOkf4V4n4QrZR7gThGmtYYa23vh2B/I9u2fQO NyWupXQEAAA== To: Tony Nguyen , Przemek Kitszel X-Developer-Signature: v=1; a=openpgp-sha256; l=4346; i=kurt@linutronix.de; h=from:subject:message-id; bh=zRsBZmcR44mwRdEcxQ8uNtRRLKAB0Wf+n8rpm6sYX0Q=; b=owEBbQKS/ZANAwAKAcGT0fKqRnOCAcsmYgBnCOlS3eky7C00qRl6tH9wz1qVg4PJXePyuWaMd MUF7SjV9OOJAjMEAAEKAB0WIQS8ub+yyMN909/bWZLBk9HyqkZzggUCZwjpUgAKCRDBk9HyqkZz gjJgD/9qenkSprkR07E3a9KWjoJg4Nli8NZaKH4dZPtW4a2pFkYcFLwGF3QXHqfNKzqyKmeLpNW gKhQCEbkIay0f/qY1+P0FasHeie+gFvqUFHkHV60UTn4FtDpY5KvITidNnGr0jOlEcPXmzpbHCb 9/O/sGav/A8zj+Wa9rrcWCs85QOKj2bodTNw4HyockPjzaKnzD4apuLi0ca+2cscRBjUkLgdWuh PtnQS4rIJ5INJ+Y+lfzLYqYVQ853Q9mzs3jysmmRv++bH9CCSfImgzhxKyqwXk+fDXqhtRxzNlL SG6o0iaa/gyLrOyX93qtiPhc2RnoXz83cdH64gq2Uj+JG/gT/ZtVlENFozODk3hiK4oMV5spsus m+jNoDC9X47x8Ig9Q+xcntYvZH9d3cRs3BakQrWJv6Pw2plDKCYlp3IA+Pr8WsavSm1HPOqcGYc pRneUcSdD05fNS6P6rkxlvhQ2TTZDTitVRDrUTwfMMcrhj3MuT5HoO1yp+x2Gdp14ZEx7hjb2hM kM0/LwykJck8pezscrfiJ7QoXslCE/ug4NwpRNLUarTjG21Q0XF0AdxsjB0V895lAJ+IGiyGvPZ MTlMw1FMxGoKoTqsQSXW9Qyk/qbbn0XPgU5xVLPH5Z2tV8l8FssYS9iuNvo1bTIBAkBydbEa5rS dhJBsscAFVoCZqg== X-Developer-Key: i=kurt@linutronix.de; 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bh=SNoU83pdmMYp5IKr04g1xQTk3F9nU+Iqgxe0aJZi9iw=; b=i1LeZAFiJQYCBjQcewW0IA/jA2nuHfkFZ/Om+K3Cx7lxV2/Bed3MRIYOwzhLSKwI0Z6NnR UqjGcPCKZLM/AgCA== X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dmarc=pass (p=none dis=none) header.from=linutronix.de X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=ooNSTFEP; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=i1LeZAFi Subject: [Intel-wired-lan] [PATCH iwl-next v8 0/6] igb: Add support for AF_XDP zero-copy X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Maciej Fijalkowski , Jesper Dangaard Brouer , Daniel Borkmann , Sriram Yagnaraman , Richard Cochran , Kurt Kanzenbach , John Fastabend , Alexei Starovoitov , Benjamin Steinke , Eric Dumazet , Sriram Yagnaraman , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, Jakub Kicinski , bpf@vger.kernel.org, Paolo Abeni , "David S. Miller" , Sebastian Andrzej Siewior Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" This is version v8 of the AF_XDP zero-copy support for igb. Since Sriram's duties changed I am sending this instead. Additionally, I've tested this on real hardware, Intel i210 [1]. Changes since v7: - Collect tags - Split patches (Maciej) - Use read once xsk_pool pointer in igb_alloc_rx_buffers_zc() (Maciej) - Add FIXME about RS bit in Tx path (Maciej) - Link to v7: https://lore.kernel.org/r/20241007-b4-igb_zero_copy-v7-0-23556668adc6@linutronix.de Changes since v6: - Rebase to v6.12 - Collect tags - Merged first patch via -net - Inline small functions (Maciej) - Read xdp_prog only once per NAPI cycle (Maciej) - Use u32 for stack based variables (Maciej) - Link to v6: https://lore.kernel.org/r/20240711-b4-igb_zero_copy-v6-0-4bfb68773b18@linutronix.de Changes since v5: - Rebase to 6.11 - Fix set-but-unused variable warnings - Split first patches (Maciej) - Add READ/WRITE_ONCE() for xsk_pool and xdp_prog (Maciej) - Add synchronize_net() (Maciej) - Remove IGB_RING_FLAG_AF_XDP_ZC (Maciej) - Add NETDEV_XDP_ACT_XSK_ZEROCOPY to last patch (Maciej) - Update Rx ntc handling (Maciej) - Move stats update and xdp finalize to common functions (Maciej) - "Likelyfy" XDP_REDIRECT case (Maciej) - Check Tx disabled and carrier in igb_xmit_zc() (Maciej) - RCT (Maciej) - Link to v5: https://lore.kernel.org/r/20240711-b4-igb_zero_copy-v5-0-f3f455113b11@linutronix.de Changes since v4: - Rebase to v6.10 - Fix issue reported by kernel test robot - Provide napi_id for xdp_rxq_info_reg() so that busy polling works - Set olinfo_status in igb_xmit_zc() so that frames are transmitted Link to v4: https://lore.kernel.org/intel-wired-lan/20230804084051.14194-1-sriram.yagnaraman@est.tech/ [1] - https://github.com/Linutronix/TSN-Testbench/tree/main/tests/busypolling_i210 Original cover letter: The first couple of patches adds helper funcctions 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 v3->v4: - NULL check buffer_info in igb_dump before dereferencing (Simon Horman) v2->v3: - Avoid TX unit hang when using AF_XDP zero-copy by setting time_stamp on the tx_buffer_info - Fix uninitialized nb_buffs (Simon Horman) v1->v2: - Use batch XSK APIs (Maciej Fijalkowski) - Follow reverse xmas tree convention and remove the ternary operator use (Simon Horman) --- Kurt Kanzenbach (1): igb: Add XDP finalize and stats update functions Sriram Yagnaraman (5): igb: Remove static qualifiers igb: Introduce igb_xdp_is_enabled() igb: Introduce XSK data structures and helpers igb: Add AF_XDP zero-copy Rx support igb: Add AF_XDP zero-copy Tx support drivers/net/ethernet/intel/igb/Makefile | 2 +- drivers/net/ethernet/intel/igb/igb.h | 58 ++- drivers/net/ethernet/intel/igb/igb_main.c | 248 ++++++++----- drivers/net/ethernet/intel/igb/igb_xsk.c | 567 ++++++++++++++++++++++++++++++ 4 files changed, 792 insertions(+), 83 deletions(-) --- base-commit: f5cae3d7f24df1e8ebcc8b5890a655fa151f3461 change-id: 20240711-b4-igb_zero_copy-bb70a31ecb0f Best regards,