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authorLorenzo Bianconi <lorenzo@kernel.org>2020-07-17 01:16:29 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-20 04:28:33 +0300
commit2f0bc54ba9a85032f2402faf0fccab513848300a (patch)
tree4c6ff1a57b746749e299739fca0f0a1b4ec2427d /include/net/xdp.h
parentbed1ce78761925785cfccbd73aea2d889f625b68 (diff)
downloadlinux-2f0bc54ba9a85032f2402faf0fccab513848300a.tar.xz
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@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/xdp.h')
-rw-r--r--include/net/xdp.h15
1 files changed, 15 insertions, 0 deletions
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)
{