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Date:   Fri, 28 Aug 2020 23:20:19 +0800
From:   Weqaar Janjua <weqaar.a.janjua@...el.com>
To:     magnus.karlsson@...el.com, bjorn.topel@...el.com, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        jonathan.lemon@...il.com
Cc:     Weqaar Janjua <weqaar.a.janjua@...el.com>, bpf@...r.kernel.org
Subject: [PATCH bpf-next]  0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch

---
 ...to-xdpsock-to-avoid-recycling-frames.patch | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch

diff --git a/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch b/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch
new file mode 100644
index 000000000000..ae3b99b335e2
--- /dev/null
+++ b/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch
@@ -0,0 +1,62 @@
+From df0a23a79c9dca96c0059b4d766a613eba57200e Mon Sep 17 00:00:00 2001
+From: Weqaar Janjua <weqaar.a.janjua@...el.com>
+Date: Fri, 28 Aug 2020 13:36:32 +0100
+Subject: [PATCH bpf-next] samples/bpf: fix to xdpsock to avoid recycling
+ frames
+To: magnus.karlsson@...el.com
+
+The txpush program in the xdpsock sample application is supposed
+to send out all packets in the umem in a round-robin fashion.
+The problem is that it only cycled through the first BATCH_SIZE
+worth of packets. Fixed this so that it cycles through all buffers
+in the umem as intended.
+
+Fixes: 248c7f9c0e21 ("samples/bpf: convert xdpsock to use libbpf for AF_XDP access")
+Signed-off-by: Weqaar Janjua <weqaar.a.janjua@...el.com>
+---
+ samples/bpf/xdpsock_user.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
+index 19c679456a0e..c821e9867139 100644
+--- a/samples/bpf/xdpsock_user.c
++++ b/samples/bpf/xdpsock_user.c
+@@ -1004,7 +1004,7 @@ static void rx_drop_all(void)
+ 	}
+ }
+ 
+-static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb, int batch_size)
++static void tx_only(struct xsk_socket_info *xsk, u32 *frame_nb, int batch_size)
+ {
+ 	u32 idx;
+ 	unsigned int i;
+@@ -1017,14 +1017,14 @@ static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb, int batch_size)
+ 	for (i = 0; i < batch_size; i++) {
+ 		struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx,
+ 								  idx + i);
+-		tx_desc->addr = (frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
++		tx_desc->addr = (*frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
+ 		tx_desc->len = PKT_SIZE;
+ 	}
+ 
+ 	xsk_ring_prod__submit(&xsk->tx, batch_size);
+ 	xsk->outstanding_tx += batch_size;
+-	frame_nb += batch_size;
+-	frame_nb %= NUM_FRAMES;
++	*frame_nb += batch_size;
++	*frame_nb %= NUM_FRAMES;
+ 	complete_tx_only(xsk, batch_size);
+ }
+ 
+@@ -1080,7 +1080,7 @@ static void tx_only_all(void)
+ 		}
+ 
+ 		for (i = 0; i < num_socks; i++)
+-			tx_only(xsks[i], frame_nb[i], batch_size);
++			tx_only(xsks[i], &frame_nb[i], batch_size);
+ 
+ 		pkt_cnt += batch_size;
+ 
+-- 
+2.20.1
+
-- 
2.20.1

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