From: Magnus Karlsson <magnus.karlsson@intel.com>
Date: Wed, 25 Aug 2021 11:37:17 +0200
Subject: selftests: xsk: Decrease sending speed
Patch-mainline: v5.15-rc1
Git-commit: ab7c95abb5f9d05470ede8e75a105c81c2dbf2c1
References: jsc#PED-1377

Decrease sending speed to avoid potentially overflowing some buffers
in the skb case that leads to dropped packets we cannot control (and
thus the tests may generate false negatives). Decrease batch size and
introduce a usleep in the transmit thread to not overflow the
receiver.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210825093722.10219-12-magnus.karlsson@gmail.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/testing/selftests/bpf/xdpxceiver.c |    1 +
 tools/testing/selftests/bpf/xdpxceiver.h |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -637,6 +637,7 @@ static void tx_only_all(struct ifobject
 
 		tx_only(ifobject->xsk, &frame_nb, batch_size);
 		pkt_cnt += batch_size;
+		usleep(10);
 	}
 
 	complete_tx_only_all(ifobject);
--- a/tools/testing/selftests/bpf/xdpxceiver.h
+++ b/tools/testing/selftests/bpf/xdpxceiver.h
@@ -36,7 +36,7 @@
 #define UDP_PKT_DATA_SIZE (UDP_PKT_SIZE - sizeof(struct udphdr))
 #define USLEEP_MAX 10000
 #define SOCK_RECONF_CTR 10
-#define BATCH_SIZE 64
+#define BATCH_SIZE 8
 #define POLL_TMOUT 1000
 #define DEFAULT_PKT_CNT (4 * 1024)
 #define RX_FULL_RXQSIZE 32