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Date:   Sat, 29 Aug 2020 00:17:17 +0800
From:   Weqaar Janjua <>
Cc:     Weqaar Janjua <>,
Subject: [PATCH bpf-next] samples/bpf: fix to xdpsock to avoid recycling frames

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 <>
 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;

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