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IPQ40xx requires a special DSA tag driver despite using the QCA8337N switch. However they have changed the header format and the existing QCA tag driver cannot be reused. For details on how it actually works and else read the patch commit description. Signed-off-by: Robert Marko <robert.marko@sartura.hr>
44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
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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