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Mon, 29 Jun 2026 23:57:56 -0700 (PDT) Received: from fedora ([46.205.218.111]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4756636cf26sm4570949f8f.19.2026.06.29.23.57.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jun 2026 23:57:56 -0700 (PDT) From: Daniel Pawlik To: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org Cc: pablo@netfilter.org, fw@strlen.de, phil@nwl.cc, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, andrew+netdev@lunn.ch, razor@blackwall.org, idosch@nvidia.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, bridge@lists.linux.dev, coreteam@netfilter.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, rchen14b@gmail.com, lorenzo@kernel.org, Daniel Pawlik Subject: [PATCH v2 0/5] netfilter: nf_flow_table_path: L2 bridge offload Date: Tue, 30 Jun 2026 08:57:30 +0200 Message-ID: <20260630065735.3341614-1-pawlik.dan@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: bridge@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds L2 bridge offload support to nft_flow_offload, allowing bridged IPv4/IPv6 flows to be accelerated by the flowtable fast path without requiring L3 routing. Background ---------- Hardware flow offload engines (e.g. MediaTek PPE) can accelerate bridged traffic but require that nft_flow_offload detect and handle bridged flows differently from routed ones: no routing table lookup, MAC addresses from the Ethernet header, and VLAN context pre-populated from the bridge port. v2: Fix missing Returns: tags in kernel-doc comments for the three new bridge helpers (br_fdb_has_forwarding_entry_rcu, br_vlan_get_offload_info_rcu, br_vlan_is_enabled_rcu). Patches ------- 1/5 net: export __dev_fill_forward_path Refactors dev_fill_forward_path() to expose __dev_fill_forward_path() which accepts a caller-supplied net_device_path_ctx, needed to pre-populate VLAN state before the forward path walk. 2/5 net: bridge: add flow offload helpers Adds br_fdb_has_forwarding_entry_rcu(), br_vlan_get_offload_info_rcu() and br_vlan_is_enabled_rcu() to expose bridge state to nft_flow_offload without requiring inclusion of net/bridge/br_private.h. 3/5 netfilter: nf_flow_table_path: add L2 bridge offload Core of the series. Adds nft_flow_offload_is_bridging() detection, nft_flow_route_bridging() which avoids nf_route() (fails for bridged-only subnets), MAC/VLAN pre-population for bridged flows, and a dst leak fix. nft_flow_route() becomes a thin dispatcher. 4/5 netfilter: nf_flow_table_path: handle DEV_PATH_MTK_WDMA in path info Fixes zero-source-MAC in PPE entries when a bridged flow traverses MT7996/MT7915 WiFi WDMA hardware. 5/5 netfilter: nf_flow_table_path: add VLAN passthrough support Records VLAN encap info for passthrough-mode bridge ports so hardware offload entries include the correct VLAN tag. Rebase note ----------- Originally developed against OpenWrt pending-6.18 patches by Ryan Chen and Bo-Cun Chen . Rebased to current upstream: path discovery infrastructure moved to nf_flow_table_path.c in commit 93d7a7ed0734 ("netfilter: flowtable: move path discovery infrastructure to its own file"), so all netfilter changes now land in that file rather than nft_flow_offload.c. How to enable bridge offload ----------------------------- 1. Load kmod-br-netfilter so that bridged IP traffic traverses the netfilter forward chain. 2. Enable netfilter hooks on the bridge: echo 1 > /sys/class/net/
/bridge/nf_call_iptables echo 1 > /sys/class/net/
/bridge/nf_call_ip6tables 3. Register bridge member interfaces in the nft flowtable: table inet filter { flowtable f { hook ingress priority filter devices = { eth0, wlan0 } } chain forward { type filter hook forward priority filter meta l4proto { tcp, udp } flow add @f } } Daniel Pawlik (1): net: bridge: add flow offload helpers Ryan Chen (4): net: export __dev_fill_forward_path netfilter: nf_flow_table_path: add L2 bridge offload netfilter: nf_flow_table_path: handle DEV_PATH_MTK_WDMA in path info netfilter: nf_flow_table_path: add VLAN passthrough support include/linux/if_bridge.h | 23 ++++ include/linux/netdevice.h | 2 + net/bridge/br_fdb.c | 34 +++++ net/bridge/br_vlan.c | 47 +++++++ net/core/dev.c | 32 +++-- net/netfilter/nf_flow_table_path.c | 201 +++++++++++++++++++++++++++-- 6 files changed, 316 insertions(+), 23 deletions(-) -- 2.54.0