linux-kernel - [RFC 1/2] net-next: add a dma_desc element to struct skb_shared

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Date:   Fri, 21 Jul 2017 17:20:34 +0200
From:   John Crispin <john@...ozen.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        John Crispin <john@...ozen.org>
Subject: [RFC 1/2] net-next: add a dma_desc element to struct skb_shared_info

In order to make HW flow offloading work in latest MediaTek silicon we need
to propagate part of the RX DMS descriptor to the upper layers populating
the flow offload engines HW tables. This patch adds an extra element to
struct skb_shared_info allowing the ethernet drivers RX napi code to store
the required information and make it persistent for the lifecycle of the
skb and its clones.

Signed-off-by: John Crispin <john@...ozen.org>
---
 include/linux/skbuff.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4093552be1de..db9576cd946b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -426,6 +426,7 @@ struct skb_shared_info {
 	unsigned int	gso_type;
 	u32		tskey;
 	__be32          ip6_frag_id;
+	u32		dma_desc;

 	/*
 	 * Warning : all fields before dataref are cleared in __alloc_skb()
-- 
2.11.0