1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-5.10/700-skbuff-add-DSA-specific-data-to-struct-skb_shared_in.patch b/target/linux/ipq40xx/patches-5.10/700-skbuff-add-DSA-specific-data-to-struct-skb_shared_in.patch
new file mode 100644
index 0000000000..7cad65aa0a
--- /dev/null
+++ b/target/linux/ipq40xx/patches-5.10/700-skbuff-add-DSA-specific-data-to-struct-skb_shared_in.patch
@@ -0,0 +1,43 @@
+From da75807ac41175e9db8c95f7a172b4133763b744 Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <j4g8y7@gmail.com>
+Date: Mon, 11 Jan 2021 17:49:36 +0100
+Subject: [PATCH] skbuff: add DSA specific data to struct skb_shared_info
+
+All of the already existing DSA tagging protocol drivers
+are storing the tagging data directly into the skb. In most
+cases that is the only way to send the required information
+to the underlying ethernet switch.
+
+However on certain platforms (like the Qualcomm IPQ40xx
+SoCs) the built-in ethernet switch is connected directly
+to an ethernet MAC, and the tagging information must be
+sent out-of-band which is done directly via the hardware
+TX descriptors of the ethernet MAC.
+
+In such cases, putting the information into the skb causes
+unneccesary overhead, because the ethernet driver must
+remove that before sending the ethernet frame towards to
+the hardware.
+
+This change adds two new DSA specific fields to struct
+skb_shared_info which makes it possible to send the
+tagging information via skb->shinfo. With this approach,
+the twofold modifications of the skb data can be avoided.
+
+Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
+---
+ include/linux/skbuff.h | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/include/linux/skbuff.h
++++ b/include/linux/skbuff.h
+@@ -522,6 +522,9 @@ struct skb_shared_info {
+ 	unsigned int	gso_type;
+ 	u32		tskey;
+ 
++	unsigned int	dsa_tag_proto;
++	unsigned char	dsa_tag_data[8];
++
+ 	/*
+ 	 * Warning : all fields before dataref are cleared in __alloc_skb()
+ 	 */