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Mon, 7 Oct 2024 12:31:35 +0000 (UTC) From: Kurt Kanzenbach Date: Mon, 07 Oct 2024 14:31:22 +0200 Message-Id: <20241007-b4-igb_zero_copy-v7-0-23556668adc6@linutronix.de> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAJrUA2cC/4WOQQqDMBREryJZNyXRaKSr3qMU8euPfpBEErVa8 e4NLguly5lh3szOAnrCwG7JzjwuFMjZKPQlYU1f2w45tVGzVKRKaCk5KE4dVG/0rmrcuHEALep MYgPCsFiDOiAHX9umj0U7D0M0R4+G1nPnweg1cIvrxJ4x6SlMzm/ngSU/899bS84FN5lReS5lB lLeB7Lz5J2l9driCVyKf5AiQhQYKEqtI6T8hhzH8QFgrhf2GAEAAA== To: Tony Nguyen , Przemek Kitszel X-Developer-Signature: v=1; a=openpgp-sha256; l=3979; i=kurt@linutronix.de; h=from:subject:message-id; bh=cSr16lHesup0jyZsTm8sLeSAjC1XAE7gBsDOVQ5e4JU=; b=owEBbQKS/ZANAwAKAcGT0fKqRnOCAcsmYgBnA9SfeeE7eiysY3Z4ekSZ3cnBTHezh25rJ8ZTx IF1aAvXFj2JAjMEAAEKAB0WIQS8ub+yyMN909/bWZLBk9HyqkZzggUCZwPUnwAKCRDBk9HyqkZz gtybD/9uAO8asrLO30z7y9hDi2VfpP0uJpDNT34qFt0fWBDe3/C2UdkuKhBW1LIG+oSRd7jMD1g t6CdfdQTVc1Vv6uChpgAFibi4z4DM2WLzZxOKsVnmexrKLuDXFFhSmBMFvI2mmwfdgKF4iZKThA Y/lCZNfPCR9WZbt1BrkC027ETR3pqQqAiyLQqnVfxZh8oYmYaqXQZcBi+1gF9+FJAnggV+grMHn KwWwhZOoKFtZPy6ImPAwMCArlQ1eyZZMvB6TL+cEu84xJxHXKFGLt5rZPHU0mqb0FK8YoiTdIUj HhQYOPks65HK9a5DE6bJ9QZS1bARCoab97jn07eYDMFn1PJh1A5xMvwg/Tl8zyNvfsVGOpDjnR/ Q1XtKXxNVizN1hafyJs/0wdbKgdzLmwvGSwsAUOIHT1MEtxqcduFsgn1jJMgidNe9ljCyqBluUd UlPef6WoQDWyQNF1Bb8v+wmLFKvzzgWHb687W5S1oarmhGXq2jgoNK71uE+wzqOgWEq/TDd+Mhu 3Y2BIV461HPpGMkJXS8jft6dZyykPK0J2Sy0MUUsGoLeAj87Zz89laWo2VLUWt7p0Ghh+PV5nyo Ze/klIIjFHHk4Y2yHKOihvZ98lzIxKToVTOmxB04r/rVHbbep8wiYmI1lwRFGv4mCCMgoZivJRe wtc96/IoysbIqmQ== X-Developer-Key: i=kurt@linutronix.de; 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bh=n80mNWK26mFk+wt7hmAWZnpX8w+IrgjsndVOCDRIpmw=; b=6lES4Fbi17ybIvKVBiXpXUFozPYE13Qb+N33Nic4R1xhLs2CKi14AO//E+AoTGJwdOaxxJ 5FbKbaYmZqar3mBw== X-Mailman-Original-Authentication-Results: smtp4.osuosl.org; dmarc=pass (p=none dis=none) header.from=linutronix.de X-Mailman-Original-Authentication-Results: smtp4.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=kgiFrxQ0; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=6lES4Fbi Subject: [Intel-wired-lan] [PATCH iwl-next v7 0/5] 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 v7 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 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) --- 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 | 57 ++- drivers/net/ethernet/intel/igb/igb_main.c | 247 ++++++++----- drivers/net/ethernet/intel/igb/igb_xsk.c | 560 ++++++++++++++++++++++++++++++ 4 files changed, 783 insertions(+), 83 deletions(-) --- base-commit: 1e37963a388fe7361259f1a769cef4bac2012534 change-id: 20240711-b4-igb_zero_copy-bb70a31ecb0f Best regards,