[PATCH 4/5] netfilter: nf_flow_table_path: handle DEV_PATH_MTK_WDMA in path info

From: Ryan Chen <redacted>

Without this change, nft_dev_path_info() hits the default -ENOENT path
for WiFi bridge offload via WDMA on MT7996. When a bridged flow goes
through the MT7996 WiFi device, the DEV_PATH_MTK_WDMA step does not set
h_source, causing the PPE entry to receive a zero source MAC and packets
to stall in both software fastpath and hardware path.

Based on a MediaTek SDK patch by Bo-Cun Chen [off-list ref].
Signed-off-by: Ryan Chen <redacted>
Signed-off-by: Daniel Pawlik <redacted>
---
 net/netfilter/nf_flow_table_path.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c
index 6c470854127f..580aa1db3cb4 100644
--- a/net/netfilter/nf_flow_table_path.c
+++ b/net/netfilter/nf_flow_table_path.c

@@ -219,6 +219,10 @@ static int nft_dev_path_info(const struct net_device_path_stack *stack,
 			}
 			info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT;
 			break;
+		case DEV_PATH_MTK_WDMA:
+			if (is_zero_ether_addr(info->h_source))
+				memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
+			break;
 		default:
 			return -1;
 		}

-- 
2.54.0