netdev - [PATCH bpf-next 1/2] net: skbuff: add xdp_frags_tsize field to skb_shared

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Message-Id: <2a37aaa826807751478a2003b83ccb9838323b17.1625828537.git.lorenzo@kernel.org>
Date:   Fri,  9 Jul 2021 13:10:27 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, alexander.duyck@...il.com, brouer@...hat.com,
        echaudro@...hat.com, magnus.karlsson@...el.com,
        tirthendu.sarkar@...el.com, toke@...hat.com
Subject: [PATCH bpf-next 1/2] net: skbuff: add xdp_frags_tsize field to skb_shared_info

xdp_frags_tsize field will be used to store paged frame
truesize for xdp_buff/xdp_frame. In order to not increase
skb_shared_info size we will use a hole due to skb_shared_info
alignment.
gso_type filed will be used to store paged frame size.
This is a preliminary patch to properly support xdp multi-buff

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 include/linux/skbuff.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f19190820e63..0e345c5ccb4f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -522,6 +522,7 @@ struct skb_shared_info {
 	unsigned short	gso_segs;
 	struct sk_buff	*frag_list;
 	struct skb_shared_hwtstamps hwtstamps;
+	/* used for xdp_{buff,frame} paged size */
 	unsigned int	gso_type;
 	u32		tskey;
 
@@ -529,6 +530,7 @@ struct skb_shared_info {
 	 * Warning : all fields before dataref are cleared in __alloc_skb()
 	 */
 	atomic_t	dataref;
+	unsigned int	xdp_frags_tsize;
 
 	/* Intermediate layers must ensure that destructor_arg
 	 * remains valid until skb destructor */
-- 
2.31.1