From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= <bjorn.topel@intel.com>
Date: Thu, 30 Aug 2018 15:12:48 +0200
Subject: xsk: include XDP meta data in AF_XDP frames
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Patch-mainline: v4.20-rc1
Git-commit: 18baed2684b02f752b5d800bb113e99730e1d24b
References: bsc#1109837

Previously, the AF_XDP (XDP_DRV/XDP_SKB copy-mode) ingress logic did
not include XDP meta data in the data buffers copied out to the user
application.

In this commit, we check if meta data is available, and if so, it is
prepended to the frame.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/xdp/xsk.c |   24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -55,20 +55,30 @@ EXPORT_SYMBOL(xsk_umem_discard_addr);
 
 static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
 {
-	void *buffer;
+	void *to_buf, *from_buf;
+	u32 metalen;
 	u64 addr;
 	int err;
 
 	if (!xskq_peek_addr(xs->umem->fq, &addr) ||
-	    len > xs->umem->chunk_size_nohr) {
+	    len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
 		xs->rx_dropped++;
 		return -ENOSPC;
 	}
 
 	addr += xs->umem->headroom;
 
-	buffer = xdp_umem_get_data(xs->umem, addr);
-	memcpy(buffer, xdp->data, len);
+	if (unlikely(xdp_data_meta_unsupported(xdp))) {
+		from_buf = xdp->data;
+		metalen = 0;
+	} else {
+		from_buf = xdp->data_meta;
+		metalen = xdp->data - xdp->data_meta;
+	}
+
+	to_buf = xdp_umem_get_data(xs->umem, addr);
+	memcpy(to_buf, from_buf, len + metalen);
+	addr += metalen;
 	err = xskq_produce_batch_desc(xs->rx, addr, len);
 	if (!err) {
 		xskq_discard_addr(xs->umem->fq);
@@ -111,6 +121,7 @@ void xsk_flush(struct xdp_sock *xs)
 
 int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
 {
+	u32 metalen = xdp->data - xdp->data_meta;
 	u32 len = xdp->data_end - xdp->data;
 	void *buffer;
 	u64 addr;
@@ -120,7 +131,7 @@ int xsk_generic_rcv(struct xdp_sock *xs,
 		return -EINVAL;
 
 	if (!xskq_peek_addr(xs->umem->fq, &addr) ||
-	    len > xs->umem->chunk_size_nohr) {
+	    len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
 		xs->rx_dropped++;
 		return -ENOSPC;
 	}
@@ -128,7 +139,8 @@ int xsk_generic_rcv(struct xdp_sock *xs,
 	addr += xs->umem->headroom;
 
 	buffer = xdp_umem_get_data(xs->umem, addr);
-	memcpy(buffer, xdp->data, len);
+	memcpy(buffer, xdp->data_meta, len + metalen);
+	addr += metalen;
 	err = xskq_produce_batch_desc(xs->rx, addr, len);
 	if (!err) {
 		xskq_discard_addr(xs->umem->fq);