Subject: [PATCH v4 net-next 12/13] bridge: Introduce DEV_PATH_BR_VLAN_KEEP_HW for bridge-fastpath

From: Eric Woudstra <[email-masked]>
Date: Tue, 7 Jan 2025 10:05:29 +0100

This patch introduces DEV_PATH_BR_VLAN_KEEP_HW. It is needed in the
bridge fastpath for switchdevs supporting SWITCHDEV_OBJ_ID_PORT_VLAN.

It is similar to DEV_PATH_BR_VLAN_TAG, with the correcponding bit in
ingress_vlans set.

In the forward fastpath it is not needed.

Signed-off-by: Eric Woudstra <[email-masked]>
---
 include/linux/netdevice.h        |  1 +
 net/bridge/br_device.c           |  4 ++++
 net/bridge/br_vlan.c             | 18 +++++++++++-------
 net/netfilter/nft_flow_offload.c |  3 +++
 4 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7d66a73b880c..cf754ebb19df 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -871,6 +871,7 @@ struct net_device_path {
 				DEV_PATH_BR_VLAN_TAG,
 				DEV_PATH_BR_VLAN_UNTAG,
 				DEV_PATH_BR_VLAN_UNTAG_HW,
+				DEV_PATH_BR_VLAN_KEEP_HW,
 			}		vlan_mode;
 			u16		vlan_id;
 			__be16		vlan_proto;
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index c7646afc8b96..112fd8556217 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -430,6 +430,10 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
 	case DEV_PATH_BR_VLAN_UNTAG:
 		ctx->num_vlans--;
 		break;
+	case DEV_PATH_BR_VLAN_KEEP_HW:
+		if (!src)
+			path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
+		break;
 	case DEV_PATH_BR_VLAN_KEEP:
 		break;
 	}
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 3e50adaf8e1b..8ac1a7a22b2e 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1494,13 +1494,17 @@ int br_vlan_fill_forward_path_mode(struct net_bridge *br,
 	if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 		return 0;
 
-	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_TAGGING_BY_SWITCHDEV)
-		path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW;
-	else
-		path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
-
+	if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG) {
+		if (v->priv_flags & BR_VLFLAG_TAGGING_BY_SWITCHDEV)
+			path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP_HW;
+		else
+			path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
+	} 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;
+	}
 	return 0;
 }
 
diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index 387e5574c31f..ed0e9b499971 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -149,6 +149,9 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack,
 			case DEV_PATH_BR_VLAN_UNTAG_HW:
 				info->ingress_vlans |= BIT(info->num_encaps - 1);
 				break;
+			case DEV_PATH_BR_VLAN_KEEP_HW:
+				info->ingress_vlans |= BIT(info->num_encaps);
+				fallthrough;
 			case DEV_PATH_BR_VLAN_TAG:
 				info->encap[info->num_encaps].id = path->bridge.vlan_id;
 				info->encap[info->num_encaps].proto = path->bridge.vlan_proto;
-- 
2.47.1