From: Lorenzo Bianconi <lorenzo@kernel.org>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, bpf@vger.kernel.org, kuba@kernel.org,
ilias.apalodimas@linaro.org, lorenzo.bianconi@redhat.com,
brouer@redhat.com, echaudro@redhat.com, sameehj@amazon.com
Subject: [PATCH v2 net-next 1/6] xdp: introduce xdp_get_shared_info_from_{buff,frame} utility routines
Date: Fri, 17 Jul 2020 00:16:29 +0200 [thread overview]
Message-ID: <45a48fd7b97a3ada0bbbf017ec9c4b74ac6e5798.1594936660.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1594936660.git.lorenzo@kernel.org>
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>
---
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
next prev parent reply other threads:[~2020-07-16 23:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 22:16 [PATCH v2 net-next 0/6] rework mvneta napi_poll loop for XDP multi-buffers Lorenzo Bianconi
2020-07-16 22:16 ` Lorenzo Bianconi [this message]
2020-07-16 22:16 ` [PATCH v2 net-next 2/6] net: mvneta: move skb build after descriptors processing Lorenzo Bianconi
2020-07-16 22:16 ` [PATCH v2 net-next 3/6] net: mvneta: move mvneta_run_xdp " Lorenzo Bianconi
2020-07-16 22:16 ` [PATCH v2 net-next 4/6] net: mvneta: drop all fragments in XDP_DROP Lorenzo Bianconi
2020-07-16 22:16 ` [PATCH v2 net-next 5/6] net: mvneta: get rid of skb in mvneta_rx_queue Lorenzo Bianconi
2020-07-16 22:16 ` [PATCH v2 net-next 6/6] net: mvneta: move rxq->left_size on the stack Lorenzo Bianconi
2020-07-20 1:28 ` [PATCH v2 net-next 0/6] rework mvneta napi_poll loop for XDP multi-buffers David Miller
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