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[2001:1c00:20d:1300:1b1c:4449:176a:89ea]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9791c30cf3sm594116866b.2.2026.03.17.04.03.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Mar 2026 04:03:59 -0700 (PDT) From: Eric Woudstra To: Jiri Pirko , Ivan Vecera , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Nikolay Aleksandrov , Ido Schimmel , Pablo Neira Ayuso , Florian Westphal Cc: netdev@vger.kernel.org, bridge@lists.linux.dev, netfilter-devel@vger.kernel.org, Eric Woudstra Subject: [PATCH v12 net-next] bridge: No DEV_PATH_BR_VLAN_UNTAG_HW for dsa foreign Date: Tue, 17 Mar 2026 12:03:47 +0100 Message-ID: <20260317110347.363875-1-ericwouds@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: bridge@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In network setup as below: fastpath bypass .----------------------------------------. / \ | IP - forwarding | | / \ v | / wan ... | / | | | | | brlan.1 | | | +-------------------------------+ | | vlan 1 | | | | | | brlan (vlan-filtering) | | | +---------------+ | | | DSA-SWITCH | | | vlan 1 | | | | to | | | | untagged 1 vlan 1 | | +---------------+---------------+ . / \ ----->wlan1 lan0 . . . ^ ^ vlan 1 tagged packets untagged packets br_vlan_fill_forward_path_mode() sets DEV_PATH_BR_VLAN_UNTAG_HW when filling in from brlan.1 towards wlan1. But it should be set to DEV_PATH_BR_VLAN_UNTAG in this case. Using BR_VLFLAG_ADDED_BY_SWITCHDEV is not correct. The dsa switchdev adds it as a foreign port. The same problem for all foreignly added dsa vlans on the bridge. First add the vlan, trying only native devices. If this fails, we know this may be a vlan from a foreign device. Use BR_VLFLAG_TAGGING_BY_SWITCHDEV to make sure DEV_PATH_BR_VLAN_UNTAG_HW is set only when there if no foreign device involved. Acked-by: Nikolay Aleksandrov Signed-off-by: Eric Woudstra --- This patch has started in v2 of my original patch-set. It remains unchanged from v4, always moving along in a patch-set. The Acked-by from Nikolay Aleksandrov was added in v5. Changes in v12: - Moved to net-next.git - Split from [PATCH v11 nf-next] netfilter: fastpath fixes Changes in v10: - Moved to nf-next.git - Split from patch-set: bridge-fastpath and related improvements v9 Changes in v9: - Moved from net-next.git to nf.git Changes in v4: - Added !CONFIG_NET_SWITCHDEV version of br_switchdev_port_vlan_no_foreign_add(). include/net/switchdev.h | 1 + net/bridge/br_private.h | 10 ++++++++++ net/bridge/br_switchdev.c | 15 +++++++++++++++ net/bridge/br_vlan.c | 7 ++++++- net/switchdev/switchdev.c | 2 +- 5 files changed, 33 insertions(+), 2 deletions(-) diff --git a/include/net/switchdev.h b/include/net/switchdev.h index 8346b0d29542..ee500706496b 100644 --- a/include/net/switchdev.h +++ b/include/net/switchdev.h @@ -15,6 +15,7 @@ #define SWITCHDEV_F_NO_RECURSE BIT(0) #define SWITCHDEV_F_SKIP_EOPNOTSUPP BIT(1) #define SWITCHDEV_F_DEFER BIT(2) +#define SWITCHDEV_F_NO_FOREIGN BIT(3) enum switchdev_attr_id { SWITCHDEV_ATTR_ID_UNDEFINED, diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index b9b2981c4841..5a6f7d8fca1f 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -182,6 +182,7 @@ enum { BR_VLFLAG_MCAST_ENABLED = BIT(2), BR_VLFLAG_GLOBAL_MCAST_ENABLED = BIT(3), BR_VLFLAG_NEIGH_SUPPRESS_ENABLED = BIT(4), + BR_VLFLAG_TAGGING_BY_SWITCHDEV = BIT(5), }; /** @@ -2224,6 +2225,8 @@ void br_switchdev_mdb_notify(struct net_device *dev, int type); int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, bool changed, struct netlink_ext_ack *extack); +int br_switchdev_port_vlan_no_foreign_add(struct net_device *dev, u16 vid, u16 flags, + bool changed, struct netlink_ext_ack *extack); int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); void br_switchdev_init(struct net_bridge *br); @@ -2307,6 +2310,13 @@ static inline int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, return -EOPNOTSUPP; } +static inline int br_switchdev_port_vlan_no_foreign_add(struct net_device *dev, u16 vid, + u16 flags, bool changed, + struct netlink_ext_ack *extack) +{ + return -EOPNOTSUPP; +} + static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) { return -EOPNOTSUPP; diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c index fe3f7bbe86ee..556ed24700db 100644 --- a/net/bridge/br_switchdev.c +++ b/net/bridge/br_switchdev.c @@ -190,6 +190,21 @@ int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, return switchdev_port_obj_add(dev, &v.obj, extack); } +int br_switchdev_port_vlan_no_foreign_add(struct net_device *dev, u16 vid, u16 flags, + bool changed, struct netlink_ext_ack *extack) +{ + struct switchdev_obj_port_vlan v = { + .obj.orig_dev = dev, + .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, + .obj.flags = SWITCHDEV_F_NO_FOREIGN, + .flags = flags, + .vid = vid, + .changed = changed, + }; + + return switchdev_port_obj_add(dev, &v.obj, extack); +} + int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) { struct switchdev_obj_port_vlan v = { diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index ce72b837ff8e..636c86fa1183 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -109,6 +109,11 @@ static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br, /* Try switchdev op first. In case it is not supported, fallback to * 8021q add. */ + err = br_switchdev_port_vlan_no_foreign_add(dev, v->vid, flags, false, extack); + if (err != -EOPNOTSUPP) { + v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV | BR_VLFLAG_TAGGING_BY_SWITCHDEV; + return err; + } err = br_switchdev_port_vlan_add(dev, v->vid, flags, false, extack); if (err == -EOPNOTSUPP) return vlan_vid_add(dev, br->vlan_proto, v->vid); @@ -1491,7 +1496,7 @@ int br_vlan_fill_forward_path_mode(struct net_bridge *br, if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG) path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP; - else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) + else if (v->priv_flags & BR_VLFLAG_TAGGING_BY_SWITCHDEV) path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW; else path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG; diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c index 4d5fbacef496..bf252d116ed3 100644 --- a/net/switchdev/switchdev.c +++ b/net/switchdev/switchdev.c @@ -760,7 +760,7 @@ static int __switchdev_handle_port_obj_add(struct net_device *dev, /* Event is neither on a bridge nor a LAG. Check whether it is on an * interface that is in a bridge with us. */ - if (!foreign_dev_check_cb) + if (!foreign_dev_check_cb || port_obj_info->obj->flags & SWITCHDEV_F_NO_FOREIGN) return err; br = netdev_master_upper_dev_get(dev); -- 2.53.0