[PATCH bpf-next v3 11/14] selftests/bpf: test_xsk: Don't exit immediately on allocation failures

Bastien Curutchet (eBPF Foundation)
2025-09-04T10:11:48Z

If any allocation in the pkt_stream_*() helpers fail, exit_with_error() is
called. This terminates the program immediately. It prevents the following
tests from running and isn't compliant with the CI.

Return NULL in case of allocation failure.
Return TEST_FAILURE when something goes wrong in the packet generation.
Clean up the resources if a failure happens between two steps of a test.

Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
---
tools/testing/selftests/bpf/test_xsk.c | 136 ++++++++++++++++++++++++---------
1 file changed, 101 insertions(+), 35 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_xsk.c b/tools/testing/selftests/bpf/test_xsk.c
index 74bbfe344026e52046c8da28b747716ec6e55e28..66c6c38a65791730685453e2f429857d612008e8 100644
--- a/tools/testing/selftests/bpf/test_xsk.c
+++ b/tools/testing/selftests/bpf/test_xsk.c
@@ -489,7 +489,7 @@ static struct pkt_stream *__pkt_stream_generate(u32 nb_pkts, u32 pkt_len, u32 nb

pkt_stream = __pkt_stream_alloc(nb_pkts);
if (!pkt_stream)
- exit_with_error(ENOMEM);
+ return NULL;

pkt_stream->nb_pkts = nb_pkts;
pkt_stream->max_pkt_len = pkt_len;
@@ -513,37 +513,56 @@ static struct pkt_stream *pkt_stream_clone(struct pkt_stream *pkt_stream)
return pkt_stream_generate(pkt_stream->nb_pkts, pkt_stream->pkts[0].len);
}

-static void pkt_stream_replace_ifobject(struct ifobject *ifobj, u32 nb_pkts, u32 pkt_len)
+static int pkt_stream_replace_ifobject(struct ifobject *ifobj, u32 nb_pkts, u32 pkt_len)
{
ifobj->xsk->pkt_stream = pkt_stream_generate(nb_pkts, pkt_len);
+
+ if (!ifobj->xsk->pkt_stream)
+ return -ENOMEM;
+
+ return 0;
}

-static void pkt_stream_replace(struct test_spec *test, u32 nb_pkts, u32 pkt_len)
+static int pkt_stream_replace(struct test_spec *test, u32 nb_pkts, u32 pkt_len)
{
- pkt_stream_replace_ifobject(test->ifobj_tx, nb_pkts, pkt_len);
- pkt_stream_replace_ifobject(test->ifobj_rx, nb_pkts, pkt_len);
+ int ret;
+
+ ret = pkt_stream_replace_ifobject(test->ifobj_tx, nb_pkts, pkt_len);
+ if (ret)
+ return ret;
+
+ return pkt_stream_replace_ifobject(test->ifobj_rx, nb_pkts, pkt_len);
}

-static void __pkt_stream_replace_half(struct ifobject *ifobj, u32 pkt_len,
+static int __pkt_stream_replace_half(struct ifobject *ifobj, u32 pkt_len,
int offset)
{
struct pkt_stream *pkt_stream;
u32 i;

pkt_stream = pkt_stream_clone(ifobj->xsk->pkt_stream);
+ if (!pkt_stream)
+ return -ENOMEM;
+
for (i = 1; i < ifobj->xsk->pkt_stream->nb_pkts; i += 2)
pkt_stream_pkt_set(pkt_stream, &pkt_stream->pkts[i], offset, pkt_len);

ifobj->xsk->pkt_stream = pkt_stream;
+
+ return 0;
}

-static void pkt_stream_replace_half(struct test_spec *test, u32 pkt_len, int offset)
+static int pkt_stream_replace_half(struct test_spec *test, u32 pkt_len, int offset)
{
- __pkt_stream_replace_half(test->ifobj_tx, pkt_len, offset);
- __pkt_stream_replace_half(test->ifobj_rx, pkt_len, offset);
+ int ret = __pkt_stream_replace_half(test->ifobj_tx, pkt_len, offset);
+
+ if (ret)
+ return ret;
+
+ return __pkt_stream_replace_half(test->ifobj_rx, pkt_len, offset);
}

-static void pkt_stream_receive_half(struct test_spec *test)
+static int pkt_stream_receive_half(struct test_spec *test)
{
struct pkt_stream *pkt_stream = test->ifobj_tx->xsk->pkt_stream;
u32 i;
@@ -557,14 +576,19 @@ static void pkt_stream_receive_half(struct test_spec *test)

test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(pkt_stream->nb_pkts,
pkt_stream->pkts[0].len);
+ if (!test->ifobj_rx->xsk->pkt_stream)
+ return -ENOMEM;
+
pkt_stream = test->ifobj_rx->xsk->pkt_stream;
for (i = 1; i < pkt_stream->nb_pkts; i += 2)
pkt_stream->pkts[i].valid = false;

pkt_stream->nb_valid_entries /= 2;
+
+ return 0;
}

-static void pkt_stream_even_odd_sequence(struct test_spec *test)
+static int pkt_stream_even_odd_sequence(struct test_spec *test)
{
struct pkt_stream *pkt_stream;
u32 i;
@@ -573,13 +597,19 @@ static void pkt_stream_even_odd_sequence(struct test_spec *test)
pkt_stream = test->ifobj_tx->xsk_arr[i].pkt_stream;
pkt_stream = __pkt_stream_generate(pkt_stream->nb_pkts / 2,
pkt_stream->pkts[0].len, i, 2);
+ if (!pkt_stream)
+ return -ENOMEM;
test->ifobj_tx->xsk_arr[i].pkt_stream = pkt_stream;

pkt_stream = test->ifobj_rx->xsk_arr[i].pkt_stream;
pkt_stream = __pkt_stream_generate(pkt_stream->nb_pkts / 2,
pkt_stream->pkts[0].len, i, 2);
+ if (!pkt_stream)
+ return -ENOMEM;
test->ifobj_rx->xsk_arr[i].pkt_stream = pkt_stream;
}
+
+ return 0;
}

static void release_even_odd_sequence(struct test_spec *test)
@@ -638,7 +668,7 @@ static struct pkt_stream *__pkt_stream_generate_custom(struct ifobject *ifobj, s

pkt_stream = __pkt_stream_alloc(nb_frames);
if (!pkt_stream)
- exit_with_error(ENOMEM);
+ return NULL;

for (i = 0; i < nb_frames; i++) {
struct pkt *pkt = &pkt_stream->pkts[pkt_nb];
@@ -681,15 +711,21 @@ static struct pkt_stream *__pkt_stream_generate_custom(struct ifobject *ifobj, s
return pkt_stream;
}

-static void pkt_stream_generate_custom(struct test_spec *test, struct pkt *pkts, u32 nb_pkts)
+static int pkt_stream_generate_custom(struct test_spec *test, struct pkt *pkts, u32 nb_pkts)
{
struct pkt_stream *pkt_stream;

pkt_stream = __pkt_stream_generate_custom(test->ifobj_tx, pkts, nb_pkts, true);
+ if (!pkt_stream)
+ return -ENOMEM;
test->ifobj_tx->xsk->pkt_stream = pkt_stream;

pkt_stream = __pkt_stream_generate_custom(test->ifobj_rx, pkts, nb_pkts, false);
+ if (!pkt_stream)
+ return -ENOMEM;
test->ifobj_rx->xsk->pkt_stream = pkt_stream;
+
+ return 0;
}

static void pkt_print_data(u32 *data, u32 cnt)
@@ -1951,24 +1987,28 @@ int testapp_stats_rx_dropped(struct test_spec *test)
return TEST_SKIP;
}

- pkt_stream_replace_half(test, MIN_PKT_SIZE * 4, 0);
+ if (pkt_stream_replace_half(test, MIN_PKT_SIZE * 4, 0))
+ return TEST_FAILURE;
test->ifobj_rx->umem->frame_headroom = test->ifobj_rx->umem->frame_size -
XDP_PACKET_HEADROOM - MIN_PKT_SIZE * 3;
- pkt_stream_receive_half(test);
+ if (pkt_stream_receive_half(test))
+ return TEST_FAILURE;
test->ifobj_rx->validation_func = validate_rx_dropped;
return testapp_validate_traffic(test);
}

int testapp_stats_tx_invalid_descs(struct test_spec *test)
{
- pkt_stream_replace_half(test, XSK_UMEM__INVALID_FRAME_SIZE, 0);
+ if (pkt_stream_replace_half(test, XSK_UMEM__INVALID_FRAME_SIZE, 0))
+ return TEST_FAILURE;
test->ifobj_tx->validation_func = validate_tx_invalid_descs;
return testapp_validate_traffic(test);
}

int testapp_stats_rx_full(struct test_spec *test)
{
- pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE);
+ if (pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE))
+ return TEST_FAILURE;
pkt_stream_delete(test->ifobj_rx->xsk->pkt_stream);
test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);

@@ -1980,7 +2020,8 @@ int testapp_stats_rx_full(struct test_spec *test)

int testapp_stats_fill_empty(struct test_spec *test)
{
- pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE);
+ if (pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE))
+ return TEST_FAILURE;
pkt_stream_delete(test->ifobj_rx->xsk->pkt_stream);
test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);

@@ -1994,7 +2035,8 @@ int testapp_send_receive_unaligned(struct test_spec *test)
test->ifobj_tx->umem->unaligned_mode = true;
test->ifobj_rx->umem->unaligned_mode = true;
/* Let half of the packets straddle a 4K buffer boundary */
- pkt_stream_replace_half(test, MIN_PKT_SIZE, -MIN_PKT_SIZE / 2);
+ if (pkt_stream_replace_half(test, MIN_PKT_SIZE, -MIN_PKT_SIZE / 2))
+ return TEST_FAILURE;

return testapp_validate_traffic(test);
}
@@ -2004,7 +2046,8 @@ int testapp_send_receive_unaligned_mb(struct test_spec *test)
test->mtu = MAX_ETH_JUMBO_SIZE;
test->ifobj_tx->umem->unaligned_mode = true;
test->ifobj_rx->umem->unaligned_mode = true;
- pkt_stream_replace(test, DEFAULT_PKT_CNT, MAX_ETH_JUMBO_SIZE);
+ if (pkt_stream_replace(test, DEFAULT_PKT_CNT, MAX_ETH_JUMBO_SIZE))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

@@ -2012,14 +2055,16 @@ int testapp_single_pkt(struct test_spec *test)
{
struct pkt pkts[] = {{0, MIN_PKT_SIZE, 0, true}};

- pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts));
+ if (pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts)))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

int testapp_send_receive_mb(struct test_spec *test)
{
test->mtu = MAX_ETH_JUMBO_SIZE;
- pkt_stream_replace(test, DEFAULT_PKT_CNT, MAX_ETH_JUMBO_SIZE);
+ if (pkt_stream_replace(test, DEFAULT_PKT_CNT, MAX_ETH_JUMBO_SIZE))
+ return TEST_FAILURE;

return testapp_validate_traffic(test);
}
@@ -2060,7 +2105,8 @@ int testapp_invalid_desc_mb(struct test_spec *test)
}

test->mtu = MAX_ETH_JUMBO_SIZE;
- pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts));
+ if (pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts)))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

@@ -2105,7 +2151,8 @@ int testapp_invalid_desc(struct test_spec *test)
pkts[6].offset += umem_size;
}

- pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts));
+ if (pkt_stream_generate_custom(test, pkts, ARRAY_SIZE(pkts)))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

@@ -2117,7 +2164,8 @@ int testapp_xdp_drop(struct test_spec *test)
test_spec_set_xdp_prog(test, skel_rx->progs.xsk_xdp_drop, skel_tx->progs.xsk_xdp_drop,
skel_rx->maps.xsk, skel_tx->maps.xsk);

- pkt_stream_receive_half(test);
+ if (pkt_stream_receive_half(test))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

@@ -2149,7 +2197,8 @@ int testapp_xdp_shared_umem(struct test_spec *test)
skel_tx->progs.xsk_xdp_shared_umem,
skel_rx->maps.xsk, skel_tx->maps.xsk);

- pkt_stream_even_odd_sequence(test);
+ if (pkt_stream_even_odd_sequence(test))
+ return TEST_FAILURE;

ret = testapp_validate_traffic(test);

@@ -2163,7 +2212,8 @@ int testapp_poll_txq_tmout(struct test_spec *test)
test->ifobj_tx->use_poll = true;
/* create invalid frame by set umem frame_size and pkt length equal to 2048 */
test->ifobj_tx->umem->frame_size = 2048;
- pkt_stream_replace(test, 2 * DEFAULT_PKT_CNT, 2048);
+ if (pkt_stream_replace(test, 2 * DEFAULT_PKT_CNT, 2048))
+ return TEST_FAILURE;
return testapp_validate_traffic_single_thread(test, test->ifobj_tx);
}

@@ -2177,7 +2227,7 @@ int testapp_too_many_frags(struct test_spec *test)
{
struct pkt *pkts;
u32 max_frags, i;
- int ret;
+ int ret = TEST_FAILURE;

if (test->mode == TEST_MODE_ZC) {
max_frags = test->ifobj_tx->xdp_zc_max_segs;
@@ -2221,9 +2271,12 @@ int testapp_too_many_frags(struct test_spec *test)
pkts[2 * max_frags + 1].len = MIN_PKT_SIZE;
pkts[2 * max_frags + 1].valid = true;

- pkt_stream_generate_custom(test, pkts, 2 * max_frags + 2);
- ret = testapp_validate_traffic(test);
+ if (pkt_stream_generate_custom(test, pkts, 2 * max_frags + 2)) {
+ free(pkts);
+ return TEST_FAILURE;
+ }

+ ret = testapp_validate_traffic(test);
free(pkts);
return ret;
}
@@ -2297,7 +2350,8 @@ int testapp_send_receive_2k_frame(struct test_spec *test)
{
test->ifobj_tx->umem->frame_size = 2048;
test->ifobj_rx->umem->frame_size = 2048;
- pkt_stream_replace(test, DEFAULT_PKT_CNT, MIN_PKT_SIZE);
+ if (pkt_stream_replace(test, DEFAULT_PKT_CNT, MIN_PKT_SIZE))
+ return TEST_FAILURE;
return testapp_validate_traffic(test);
}

@@ -2419,7 +2473,13 @@ int testapp_hw_sw_max_ring_size(struct test_spec *test)
*/
test->ifobj_tx->xsk->batch_size = test->ifobj_tx->ring.tx_max_pending - 8;
test->ifobj_rx->xsk->batch_size = test->ifobj_tx->ring.tx_max_pending - 8;
- pkt_stream_replace(test, max_descs, MIN_PKT_SIZE);
+ if (pkt_stream_replace(test, max_descs, MIN_PKT_SIZE)) {
+ clean_sockets(test, test->ifobj_tx);
+ clean_sockets(test, test->ifobj_rx);
+ clean_umem(test, test->ifobj_rx, test->ifobj_tx);
+ return TEST_FAILURE;
+ }
+
return testapp_validate_traffic(test);
}

@@ -2445,8 +2505,13 @@ static int testapp_adjust_tail(struct test_spec *test, u32 value, u32 pkt_len)
test->adjust_tail = true;
test->total_steps = 1;

- pkt_stream_replace_ifobject(test->ifobj_tx, DEFAULT_BATCH_SIZE, pkt_len);
- pkt_stream_replace_ifobject(test->ifobj_rx, DEFAULT_BATCH_SIZE, pkt_len + value);
+ ret = pkt_stream_replace_ifobject(test->ifobj_tx, DEFAULT_BATCH_SIZE, pkt_len);
+ if (ret)
+ return TEST_FAILURE;
+
+ ret = pkt_stream_replace_ifobject(test->ifobj_rx, DEFAULT_BATCH_SIZE, pkt_len + value);
+ if (ret)
+ return TEST_FAILURE;

ret = testapp_xdp_adjust_tail(test, value);
if (ret)
@@ -2498,7 +2563,8 @@ int testapp_tx_queue_consumer(struct test_spec *test)
}

nr_packets = MAX_TX_BUDGET_DEFAULT + 1;
- pkt_stream_replace(test, nr_packets, MIN_PKT_SIZE);
+ if (pkt_stream_replace(test, nr_packets, MIN_PKT_SIZE))
+ return TEST_FAILURE;
test->ifobj_tx->xsk->batch_size = nr_packets;
test->ifobj_tx->xsk->check_consumer = true;

--
2.50.1