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Wed, 11 Nov 2026 06:44:29 -0800 (PST) Received: from dev.Default ([86.127.229.203]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4ba08de826asm46656495e9.0.2026.11.11.06.44.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 06:44:28 -0800 (PST) From: Agustin Santiago Isasmendi To: Navid Ghahremani , Andrew Lunn Cc: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Junyang Han , =?UTF-8?q?Stefan=20D=C3=B6singer?= , Felix Fietkau , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-wireless@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH net-next 0/5] net: ethernet: zte: zx279128s: offload flows to and from WLAN interfaces Date: Wed, 11 Nov 2026 15:44:21 +0100 Message-Id: <20261111144426.1321237-1-isasmendi.agus@gmail.com> X-Mailer: git-send-email 2.30.2 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, This series lets the ZX279128S switch driver offload flows whose ingress or egress is a mac80211 AP interface, so that WiFi <-> WAN NAT traffic no longer goes through the CPU's forwarding path. It is based on Navid Ghahremani's v2 platform series, which adds the SoC and the driver: https://lore.kernel.org/r/20261014072109.1759502-1-ghahramani.navid@gmail.com The switch fabric has a second DMA engine (a ring pair the vendor firmware uses for exactly this) and 16 "WLAN logical ports" that a classifier entry can name as ingress or egress. Patch 3 adds the ring and the ports; patch 4 binds a mac80211 interface to a port on first use and accepts flows from the flowtable in both directions; patch 5 adds debugfs testing aids. Patches 1 and 2 describe the engine's interrupt. The WLAN drivers are not touched: the frames the fabric forwards are handed to the interface's normal transmit path, and the frames of offloaded flows are picked up on the interface's ingress hook and injected into the ring. Any mac80211 driver works. This is not a WED-like path: the SoC has no block that chains the two DMA engines, so the CPU still runs the WLAN driver's own transmit and receive paths for these frames and moves the buffers between the rings (no copies on the forwarded path). What it no longer does is the bridge, routing, conntrack and NAT work, which is where the CPU time went: CPU0 drops from 54 % to 13-25 % at the rates below. This is also how the vendor firmware uses the engine. Sent as RFC because: - the base series is not merged yet, so this cannot be applied as is; - a mac80211 AP interface cannot be put in an offload-enabled flowtable today, since mac80211 answers -EOPNOTSUPP to TC_SETUP_FT and nf_tables rejects the device. This series was tested with Felix Fietkau's OpenWrt patch that ignores -EOPNOTSUPP there (target/linux/generic/pending-6.18/ 701-netfilter-nf_tables-ignore-EOPNOTSUPP-on-flowtable-d.patch). Felix, do you plan to send that upstream? Without it, or something like it, this feature cannot be enabled on mainline; - design: binding a WLAN interface to a switch port from the ethernet driver, through the interface's regular paths, keeps the WLAN drivers out of it. I would like to know whether that is acceptable or whether this should go through something closer to the mediatek WED model. The SoC has an unrelated problem under WiFi traffic: a PCIe read on one CPU deadlocks against L2C-310 maintenance on the other, discussed in https://lore.kernel.org/r/20261110153522.1620088-1-isasmendi.agus@gmail.com This series was tested with both workarounds under discussion (a lock around the PCIe reads, and the L2 cache off through the device tree) with the same results. Results on a ZTE ZXHN H3600 (MT7915 as AP, a phone as client, flowtable with lan, wan and the AP interface, NAT on wan): WAN -> WiFi download 393 Mbps offloaded, 109 Mbps on the CPU path WiFi -> WAN upload 186 Mbps (capped by the upload server), 60 30 min soak 111 transfers, none failed, ring counters consistent, kernel log clean cold / warm boot gate 17/17 and 5/5 boots, offloaded traffic on each, no hang IPv6 flows are not offloaded, as in the base driver. The register sequence and descriptor layout were reverse engineered from the vendor's GPL kernel. Builds without warnings with W=1 (board config and multi_v7_defconfig); checkpatch --strict, dt_binding_check and dtbs_check are clean. Agustin Santiago Isasmendi (5): dt-bindings: net: zte,zx279128s-gmac: add the WLAN DMA interrupt ARM: dts: zte: zx279128s: add the WLAN DMA interrupt net: ethernet: zte: zx279128s: WLAN DMA ring and logical ports net: ethernet: zte: zx279128s: offload flows to and from WLAN ports net: ethernet: zte: zx279128s: debugfs knobs for the WLAN ring .../bindings/net/zte,zx279128s-gmac.yaml | 20 +- arch/arm/boot/dts/zte/zx279128s.dtsi | 4 +- drivers/net/ethernet/zte/Kconfig | 5 +- drivers/net/ethernet/zte/Makefile | 3 +- drivers/net/ethernet/zte/zx279128s-eth.h | 124 ++- drivers/net/ethernet/zte/zx279128s-main.c | 18 +- drivers/net/ethernet/zte/zx279128s-ppe.c | 92 +- drivers/net/ethernet/zte/zx279128s-wlan.c | 874 ++++++++++++++++++ 8 files changed, 1114 insertions(+), 26 deletions(-) create mode 100644 drivers/net/ethernet/zte/zx279128s-wlan.c base-commit: 96b4b72978e9fcfdd74f809c159f26813995631b -- 2.30.2