netdev - [PATCH bpf-next 5/9] selftests: xsk: add timeout to tests

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Date:   Tue, 10 May 2022 13:56:00 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     magnus.karlsson@...el.com, bjorn@...nel.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        maciej.fijalkowski@...el.com, yhs@...com, andrii@...nel.org,
        kafai@...com, songliubraving@...com, john.fastabend@...il.com,
        kpsingh@...nel.org
Cc:     jonathan.lemon@...il.com, bpf@...r.kernel.org
Subject: [PATCH bpf-next 5/9] selftests: xsk: add timeout to tests

From: Magnus Karlsson <magnus.karlsson@...el.com>

Add a timeout to the tests so that if all packets have not been
received within 3 seconds, fail the ongoing test. Hinders a test from
dead-locking if there is something wrong.

Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 tools/testing/selftests/bpf/xdpxceiver.c | 15 +++++++++++++++
 tools/testing/selftests/bpf/xdpxceiver.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
index ebbab8f967c1..dc21951a1b0a 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -91,6 +91,7 @@
 #include <stddef.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
+#include <sys/time.h>
 #include <sys/types.h>
 #include <sys/queue.h>
 #include <time.h>
@@ -792,6 +793,7 @@ static int complete_pkts(struct xsk_socket_info *xsk, int batch_size)
 
 static int receive_pkts(struct ifobject *ifobj, struct pollfd *fds)
 {
+	struct timeval tv_end, tv_now, tv_timeout = {RECV_TMOUT, 0};
 	struct pkt_stream *pkt_stream = ifobj->pkt_stream;
 	struct pkt *pkt = pkt_stream_get_next_rx_pkt(pkt_stream);
 	struct xsk_socket_info *xsk = ifobj->xsk;
@@ -799,7 +801,20 @@ static int receive_pkts(struct ifobject *ifobj, struct pollfd *fds)
 	u32 idx_rx = 0, idx_fq = 0, rcvd, i;
 	int ret;
 
+	ret = gettimeofday(&tv_now, NULL);
+	if (ret)
+		exit_with_error(errno);
+	timeradd(&tv_now, &tv_timeout, &tv_end);
+
 	while (pkt) {
+		ret = gettimeofday(&tv_now, NULL);
+		if (ret)
+			exit_with_error(errno);
+		if (timercmp(&tv_now, &tv_end, >)) {
+			ksft_print_msg("ERROR: [%s] Receive loop timed out\n", __func__);
+			return TEST_FAILURE;
+		}
+
 		kick_rx(xsk);
 
 		rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
diff --git a/tools/testing/selftests/bpf/xdpxceiver.h b/tools/testing/selftests/bpf/xdpxceiver.h
index 7c6bf5ed594d..79ba344d2765 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.h
+++ b/tools/testing/selftests/bpf/xdpxceiver.h
@@ -49,6 +49,7 @@
 #define SOCK_RECONF_CTR 10
 #define BATCH_SIZE 64
 #define POLL_TMOUT 1000
+#define RECV_TMOUT 3
 #define DEFAULT_PKT_CNT (4 * 1024)
 #define DEFAULT_UMEM_BUFFERS (DEFAULT_PKT_CNT / 4)
 #define UMEM_SIZE (DEFAULT_UMEM_BUFFERS * XSK_UMEM__DEFAULT_FRAME_SIZE)
-- 
2.34.1