[openwrt/openwrt] kernel: mediatek: fix WED offload regression on MT7622

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/425945c313b93d54a4bf870d95e85fb4c7c694a6

commit 425945c313b93d54a4bf870d95e85fb4c7c694a6
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Dec 27 19:09:38 2022 +0100

    kernel: mediatek: fix WED offload regression on MT7622
    
    Fix dealing with DSA untagging offload
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 ...t-mtk_eth_soc-ppe-fix-L2-offloading-with-.patch | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/target/linux/generic/pending-5.15/734-net-ethernet-mtk_eth_soc-ppe-fix-L2-offloading-with-.patch b/target/linux/generic/pending-5.15/734-net-ethernet-mtk_eth_soc-ppe-fix-L2-offloading-with-.patch
new file mode 100644
index 0000000000..39d6d0c879
--- /dev/null
+++ b/target/linux/generic/pending-5.15/734-net-ethernet-mtk_eth_soc-ppe-fix-L2-offloading-with-.patch
@@ -0,0 +1,55 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Tue, 27 Dec 2022 15:02:51 +0100
+Subject: [PATCH] net: ethernet: mtk_eth_soc: ppe: fix L2 offloading with DSA
+ untagging offload enabled
+
+Check for skb metadata in order to detect the case where the DSA header is not
+present.
+
+Fixes: 2d7605a72906 ("net: ethernet: mtk_eth_soc: enable hardware DSA untagging")
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -1992,9 +1992,6 @@ static int mtk_poll_rx(struct napi_struc
+ 			skb_checksum_none_assert(skb);
+ 		skb->protocol = eth_type_trans(skb, netdev);
+ 
+-		if (reason == MTK_PPE_CPU_REASON_HIT_UNBIND_RATE_REACHED)
+-			mtk_ppe_check_skb(eth->ppe[0], skb, hash);
+-
+ 		/* When using VLAN untagging in combination with DSA, the
+ 		 * hardware treats the MTK special tag as a VLAN and untags it.
+ 		 */
+@@ -2007,6 +2004,9 @@ static int mtk_poll_rx(struct napi_struc
+ 				skb_dst_set_noref(skb, &eth->dsa_meta[port]->dst);
+ 		}
+ 
++		if (reason == MTK_PPE_CPU_REASON_HIT_UNBIND_RATE_REACHED)
++			mtk_ppe_check_skb(eth->ppe[0], skb, hash);
++
+ 		skb_record_rx_queue(skb, 0);
+ 		napi_gro_receive(napi, skb);
+ 
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -8,6 +8,7 @@
+ #include <linux/platform_device.h>
+ #include <linux/if_ether.h>
+ #include <linux/if_vlan.h>
++#include <net/dst_metadata.h>
+ #include <net/dsa.h>
+ #include "mtk_eth_soc.h"
+ #include "mtk_ppe.h"
+@@ -756,7 +757,9 @@ void __mtk_ppe_check_skb(struct mtk_ppe
+ 		    skb->dev->dsa_ptr->tag_ops->proto != DSA_TAG_PROTO_MTK)
+ 			goto out;
+ 
+-		tag += 4;
++		if (!skb_metadata_dst(skb))
++			tag += 4;
++
+ 		if (get_unaligned_be16(tag) != ETH_P_8021Q)
+ 			break;
+