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Date: Tue, 2 Apr 2024 11:45:27 +0000
From: Tushar Vyavahare <tushar.vyavahare@...el.com>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org,
bjorn@...nel.org,
magnus.karlsson@...el.com,
maciej.fijalkowski@...el.com,
jonathan.lemon@...il.com,
davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
ast@...nel.org,
daniel@...earbox.net,
tirthendu.sarkar@...el.com,
tushar.vyavahare@...el.com
Subject: [PATCH bpf-next v3 5/7] selftests/xsk: introduce set_ring_size function with a retry mechanism for handling AF_XDP socket closures
Introduce a new function, set_ring_size(), to manage asynchronous AF_XDP
socket closure. Retry set_hw_ring_size up to SOCK_RECONF_CTR times if it
fails due to an active AF_XDP socket. Return an error immediately for
non-EBUSY errors. This enhances robustness against asynchronous AF_XDP
socket closures during ring size changes.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@...el.com>
---
tools/testing/selftests/bpf/Makefile | 2 +-
tools/testing/selftests/bpf/xskxceiver.c | 57 +++++++++++++++++++++++-
tools/testing/selftests/bpf/xskxceiver.h | 9 ++++
3 files changed, 66 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index b0ac3dd80acf..eea5b8deaaf0 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -695,7 +695,7 @@ $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
# Include find_bit.c to compile xskxceiver.
EXTRA_SRC := $(TOOLSDIR)/lib/find_bit.c
-$(OUTPUT)/xskxceiver: $(EXTRA_SRC) xskxceiver.c xskxceiver.h $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.h $(BPFOBJ) | $(OUTPUT)
+$(OUTPUT)/xskxceiver: $(EXTRA_SRC) xskxceiver.c xskxceiver.h $(OUTPUT)/network_helpers.o $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.h $(BPFOBJ) | $(OUTPUT)
$(call msg,BINARY,,$@)
$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index eaa102c8098b..8c26868e17cf 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -81,6 +81,7 @@
#include <linux/mman.h>
#include <linux/netdev.h>
#include <linux/bitmap.h>
+#include <linux/ethtool.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <locale.h>
@@ -105,11 +106,15 @@
#include "../kselftest.h"
#include "xsk_xdp_common.h"
+#include <network_helpers.h>
+
static bool opt_verbose;
static bool opt_print_tests;
static enum test_mode opt_mode = TEST_MODE_ALL;
static u32 opt_run_test = RUN_ALL_TESTS;
+void test__fail(void) { /* for network_helpers.c */ }
+
static void __exit_with_error(int error, const char *file, const char *func, int line)
{
ksft_test_result_fail("[%s:%s:%i]: ERROR: %d/\"%s\"\n", file, func, line, error,
@@ -409,6 +414,33 @@ static void parse_command_line(struct ifobject *ifobj_tx, struct ifobject *ifobj
}
}
+static int set_ring_size(struct ifobject *ifobj)
+{
+ int ret;
+ u32 ctr = 0;
+
+ while (ctr++ < SOCK_RECONF_CTR) {
+ ret = set_hw_ring_size(ifobj->ifname, &ifobj->ring);
+ if (!ret)
+ break;
+
+ /* Retry if it fails */
+ if (ctr >= SOCK_RECONF_CTR || errno != EBUSY)
+ return -errno;
+
+ usleep(USLEEP_MAX);
+ }
+
+ return ret;
+}
+
+static int hw_ring_size_reset(struct ifobject *ifobj)
+{
+ ifobj->ring.tx_pending = ifobj->set_ring.default_tx;
+ ifobj->ring.rx_pending = ifobj->set_ring.default_rx;
+ return set_ring_size(ifobj);
+}
+
static void __test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
struct ifobject *ifobj_rx)
{
@@ -452,12 +484,16 @@ static void __test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
}
}
+ if (ifobj_tx->hw_ring_size_supp)
+ hw_ring_size_reset(ifobj_tx);
+
test->ifobj_tx = ifobj_tx;
test->ifobj_rx = ifobj_rx;
test->current_step = 0;
test->total_steps = 1;
test->nb_sockets = 1;
test->fail = false;
+ test->set_ring = false;
test->mtu = MAX_ETH_PKT_SIZE;
test->xdp_prog_rx = ifobj_rx->xdp_progs->progs.xsk_def_prog;
test->xskmap_rx = ifobj_rx->xdp_progs->maps.xsk;
@@ -1862,6 +1898,14 @@ static int testapp_validate_traffic(struct test_spec *test)
return TEST_SKIP;
}
+ if (test->set_ring) {
+ if (ifobj_tx->hw_ring_size_supp)
+ return set_ring_size(ifobj_tx);
+
+ ksft_test_result_skip("Changing HW ring size not supported.\n");
+ return TEST_SKIP;
+ }
+
xsk_attach_xdp_progs(test, ifobj_rx, ifobj_tx);
return __testapp_validate_traffic(test, ifobj_rx, ifobj_tx);
}
@@ -2479,7 +2523,7 @@ static const struct test_spec tests[] = {
{.name = "ALIGNED_INV_DESC_MULTI_BUFF", .test_func = testapp_aligned_inv_desc_mb},
{.name = "UNALIGNED_INV_DESC_MULTI_BUFF", .test_func = testapp_unaligned_inv_desc_mb},
{.name = "TOO_MANY_FRAGS", .test_func = testapp_too_many_frags},
-};
+ };
static void print_tests(void)
{
@@ -2499,6 +2543,7 @@ int main(int argc, char **argv)
int modes = TEST_MODE_SKB + 1;
struct test_spec test;
bool shared_netdev;
+ int ret;
/* Use libbpf 1.0 API mode */
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
@@ -2536,6 +2581,13 @@ int main(int argc, char **argv)
modes++;
}
+ ret = get_hw_ring_size(ifobj_tx->ifname, &ifobj_tx->ring);
+ if (!ret) {
+ ifobj_tx->hw_ring_size_supp = true;
+ ifobj_tx->set_ring.default_tx = ifobj_tx->ring.tx_pending;
+ 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);
@@ -2583,6 +2635,9 @@ int main(int argc, char **argv)
}
}
+ if (ifobj_tx->hw_ring_size_supp)
+ hw_ring_size_reset(ifobj_tx);
+
pkt_stream_delete(tx_pkt_stream_default);
pkt_stream_delete(rx_pkt_stream_default);
xsk_unload_xdp_programs(ifobj_tx);
diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
index 425304e52f35..906de5fab7a3 100644
--- a/tools/testing/selftests/bpf/xskxceiver.h
+++ b/tools/testing/selftests/bpf/xskxceiver.h
@@ -114,6 +114,11 @@ struct pkt_stream {
bool verbatim;
};
+struct set_hw_ring {
+ u32 default_tx;
+ u32 default_rx;
+};
+
struct ifobject;
struct test_spec;
typedef int (*validation_func_t)(struct ifobject *ifobj);
@@ -130,6 +135,8 @@ struct ifobject {
struct xsk_xdp_progs *xdp_progs;
struct bpf_map *xskmap;
struct bpf_program *xdp_prog;
+ struct ethtool_ringparam ring;
+ struct set_hw_ring set_ring;
enum test_mode mode;
int ifindex;
int mtu;
@@ -146,6 +153,7 @@ struct ifobject {
bool unaligned_supp;
bool multi_buff_supp;
bool multi_buff_zc_supp;
+ bool hw_ring_size_supp;
};
struct test_spec {
@@ -163,6 +171,7 @@ struct test_spec {
u16 current_step;
u16 nb_sockets;
bool fail;
+ bool set_ring;
enum test_mode mode;
char name[MAX_TEST_NAME_SIZE];
};
--
2.34.1
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