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- From da75807ac41175e9db8c95f7a172b4133763b744 Mon Sep 17 00:00:00 2001
- From: Gabor Juhos <[email protected]>
- 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 <[email protected]>
- ---
- include/linux/skbuff.h | 3 +++
- 1 file changed, 3 insertions(+)
- --- a/include/linux/skbuff.h
- +++ b/include/linux/skbuff.h
- @@ -564,6 +564,9 @@ 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()
- */
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