linux-kernel - [PATCH 04/13] selftests/bpf: test_xsk: Add return value to init

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Message-Id: <20250313-xsk-v1-4-7374729a93b9@bootlin.com>
Date: Thu, 13 Mar 2025 11:48:02 +0100
From: "Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@...tlin.com>
To: Björn Töpel <bjorn@...nel.org>, 
 Magnus Karlsson <magnus.karlsson@...el.com>, 
 Maciej Fijalkowski <maciej.fijalkowski@...el.com>, 
 Jonathan Lemon <jonathan.lemon@...il.com>, 
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
 Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, 
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, 
 Shuah Khan <shuah@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Alexis Lothore <alexis.lothore@...tlin.com>, netdev@...r.kernel.org, 
 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 "Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@...tlin.com>
Subject: [PATCH 04/13] selftests/bpf: test_xsk: Add return value to
 init_iface()

init_iface() doesn't have any return value while it can fail. In case of
failure it calls exit_on_error() which will terminate the test
immediately.

Add a return value to init_iface() so errors can be handled more
smoothly.

Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@...tlin.com>
---
 tools/testing/selftests/bpf/xskxceiver.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 8b74a0f79c2e594b4db495acabd02a01a5b1b95f..01a0ddbf1cf52760a4a4d168da2fec1859e6b4b8 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -2380,7 +2380,7 @@ static bool hugepages_present(void)
 	return true;
 }

-static void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
+static int init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 {
 	LIBBPF_OPTS(bpf_xdp_query_opts, query_opts);
 	int err;
@@ -2390,7 +2390,7 @@ static void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 	err = xsk_load_xdp_programs(ifobj);
 	if (err) {
 		print_msg("Error loading XDP program\n");
-		exit_with_error(err);
+		return err;
 	}

 	if (hugepages_present())
@@ -2399,7 +2399,7 @@ static void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 	err = bpf_xdp_query(ifobj->ifindex, XDP_FLAGS_DRV_MODE, &query_opts);
 	if (err) {
 		print_msg("Error querying XDP capabilities\n");
-		exit_with_error(-err);
+		return err;
 	}
 	if (query_opts.feature_flags & NETDEV_XDP_ACT_RX_SG)
 		ifobj->multi_buff_supp = true;
@@ -2411,6 +2411,8 @@ static void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 			ifobj->xdp_zc_max_segs = 0;
 		}
 	}
+
+	return 0;
 }

 static int testapp_send_receive(struct test_spec *test)
@@ -2719,8 +2721,11 @@ int main(int argc, char **argv)
 		ifobj_tx->set_ring.default_rx = ifobj_tx->ring.rx_pending;
 	}

-	init_iface(ifobj_rx, worker_testapp_validate_rx);
-	init_iface(ifobj_tx, worker_testapp_validate_tx);
+	if (init_iface(ifobj_rx, worker_testapp_validate_rx) ||
+	    init_iface(ifobj_tx, worker_testapp_validate_tx)) {
+		print_msg("Error : can't initialize interfaces\n");
+		ksft_exit_xfail();
+	}

 	test_spec_init(&test, ifobj_tx, ifobj_rx, 0, &tests[0]);
 	tx_pkt_stream_default = pkt_stream_generate(DEFAULT_PKT_CNT, MIN_PKT_SIZE);

-- 
2.48.1