netdev - [PATCH v2 net-next 1/6] xdp: introduce xdp_get_shared_info_from

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Message-Id: <45a48fd7b97a3ada0bbbf017ec9c4b74ac6e5798.1594936660.git.lorenzo@kernel.org>
Date:   Fri, 17 Jul 2020 00:16:29 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, bpf@...r.kernel.org, kuba@...nel.org,
        ilias.apalodimas@...aro.org, lorenzo.bianconi@...hat.com,
        brouer@...hat.com, echaudro@...hat.com, sameehj@...zon.com
Subject: [PATCH v2 net-next 1/6] xdp: introduce xdp_get_shared_info_from_{buff,frame} utility routines

Introduce xdp_get_shared_info_from_{buff,frame} utility routines to get
skb_shared_info from xdp buffer/frame pointer.
xdp_get_shared_info_from_{buff,frame} will be used to implement xdp
multi-buffer support

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 include/net/xdp.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/net/xdp.h b/include/net/xdp.h
index 609f819ed08b..d3005bef812f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -85,6 +85,12 @@ struct xdp_buff {
 	((xdp)->data_hard_start + (xdp)->frame_sz -	\
 	 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_buff(struct xdp_buff *xdp)
+{
+	return (struct skb_shared_info *)xdp_data_hard_end(xdp);
+}
+
 struct xdp_frame {
 	void *data;
 	u16 len;
@@ -98,6 +104,15 @@ struct xdp_frame {
 	struct net_device *dev_rx; /* used by cpumap */
 };
 
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_frame(struct xdp_frame *frame)
+{
+	void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);
+
+	return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
+				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
+}
+
 /* Clear kernel pointers in xdp_frame */
 static inline void xdp_scrub_frame(struct xdp_frame *frame)
 {
-- 
2.26.2