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44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
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From da75807ac41175e9db8c95f7a172b4133763b744 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <j4g8y7@gmail.com>
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Date: Mon, 11 Jan 2021 17:49:36 +0100
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Subject: [PATCH] skbuff: add DSA specific data to struct skb_shared_info
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All of the already existing DSA tagging protocol drivers
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are storing the tagging data directly into the skb. In most
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cases that is the only way to send the required information
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to the underlying ethernet switch.
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However on certain platforms (like the Qualcomm IPQ40xx
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SoCs) the built-in ethernet switch is connected directly
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to an ethernet MAC, and the tagging information must be
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sent out-of-band which is done directly via the hardware
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TX descriptors of the ethernet MAC.
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In such cases, putting the information into the skb causes
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unneccesary overhead, because the ethernet driver must
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remove that before sending the ethernet frame towards to
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the hardware.
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This change adds two new DSA specific fields to struct
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skb_shared_info which makes it possible to send the
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tagging information via skb->shinfo. With this approach,
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the twofold modifications of the skb data can be avoided.
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Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
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---
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include/linux/skbuff.h | 3 +++
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1 file changed, 3 insertions(+)
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -528,6 +528,9 @@ struct skb_shared_info {
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unsigned int gso_type;
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u32 tskey;
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+ unsigned int dsa_tag_proto;
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+ unsigned char dsa_tag_data[8];
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+
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/*
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* Warning : all fields before dataref are cleared in __alloc_skb()
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*/
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