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Message-ID: <20221027200019.4106375-5-sdf@google.com>
Date: Thu, 27 Oct 2022 13:00:18 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, song@...nel.org, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
haoluo@...gle.com, jolsa@...nel.org,
Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Anatoly Burakov <anatoly.burakov@...el.com>,
Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
netdev@...r.kernel.org
Subject: [RFC bpf-next 4/5] selftests/bpf: Convert xskxceiver to use custom program
No functional changes (in theory): convert libxsk-generated
program bytecode to the C code to better illustrate kfunc
metadata (see next patch in the series).
There is also a bunch of unrelated changes, ignore them for the
sake of demo:
- stats.rx_dopped == 2048 vs 2047 ?
- buggy ksft_print_msg calls
- test is limited only to
TEST_MODE_DRV+TEST_TYPE_RUN_TO_COMPLETION_SINGLE_PKT
Cc: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: Anatoly Burakov <anatoly.burakov@...el.com>
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
Cc: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: Maryam Tahhan <mtahhan@...hat.com>
Cc: xdp-hints@...-project.net
Cc: netdev@...r.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
tools/testing/selftests/bpf/Makefile | 1 +
.../testing/selftests/bpf/progs/xskxceiver.c | 21 ++++
tools/testing/selftests/bpf/xskxceiver.c | 98 +++++++++++++++----
tools/testing/selftests/bpf/xskxceiver.h | 5 +-
4 files changed, 105 insertions(+), 20 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/xskxceiver.c
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 79edef1dbda4..3cab2e1b0e74 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -378,6 +378,7 @@ linked_maps.skel.h-deps := linked_maps1.bpf.o linked_maps2.bpf.o
test_subskeleton.skel.h-deps := test_subskeleton_lib2.bpf.o test_subskeleton_lib.bpf.o test_subskeleton.bpf.o
test_subskeleton_lib.skel.h-deps := test_subskeleton_lib2.bpf.o test_subskeleton_lib.bpf.o
test_usdt.skel.h-deps := test_usdt.bpf.o test_usdt_multispec.bpf.o
+xskxceiver-deps := xskxceiver.bpf.o
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
diff --git a/tools/testing/selftests/bpf/progs/xskxceiver.c b/tools/testing/selftests/bpf/progs/xskxceiver.c
new file mode 100644
index 000000000000..b135daddad3a
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/xskxceiver.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_XSKMAP);
+ __uint(max_entries, 4);
+ __type(key, __u32);
+ __type(value, __u32);
+} xsk SEC(".maps");
+
+SEC("xdp")
+int rx(struct xdp_md *ctx)
+{
+ return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 681a5db80dae..066bd691db13 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -399,6 +399,58 @@ static void usage(const char *prog)
ksft_print_msg(str, prog);
}
+static void bpf_update_xsk_map(struct ifobject *ifobject, __u32 queue_id)
+{
+ int map_fd;
+ int sock_fd;
+ int ret;
+
+ map_fd = bpf_map__fd(ifobject->bpf_obj->maps.xsk);
+ sock_fd = xsk_socket__fd(ifobject->xsk->xsk);
+
+ (void)bpf_map_delete_elem(map_fd, &queue_id);
+ ret = bpf_map_update_elem(map_fd, &queue_id, &sock_fd, 0);
+ if (ret)
+ exit_with_error(-ret);
+}
+
+static int bpf_attach(struct ifobject *ifobject)
+{
+ __u32 prog_id = 0;
+
+ bpf_xdp_query_id(ifobject->ifindex, ifobject->xdp_flags, &prog_id);
+ if (prog_id)
+ return 0;
+
+ int ret = bpf_xdp_attach(ifobject->ifindex,
+ bpf_program__fd(ifobject->bpf_obj->progs.rx),
+ ifobject->xdp_flags, NULL);
+ if (ret < 0) {
+ if (errno != EEXIST && errno != EBUSY) {
+ exit_with_error(errno);
+ }
+ }
+
+ bpf_update_xsk_map(ifobject, 0);
+
+ return 0;
+}
+
+static void bpf_detach(struct ifobject *ifobject)
+{
+ int my_ns = open("/proc/self/ns/net", O_RDONLY);
+
+ /* Make sure we're in the right namespace when detaching.
+ * Relevant only for TEST_TYPE_BIDI.
+ */
+ if (ifobject->ns_fd > 0)
+ setns(ifobject->ns_fd, 0);
+
+ bpf_xdp_detach(ifobject->ifindex, ifobject->xdp_flags, NULL);
+
+ setns(my_ns, 0);
+}
+
static int switch_namespace(const char *nsname)
{
char fqns[26] = "/var/run/netns/";
@@ -1141,9 +1193,10 @@ static int validate_rx_dropped(struct ifobject *ifobject)
if (err)
return TEST_FAILURE;
- if (stats.rx_dropped == ifobject->pkt_stream->nb_pkts / 2)
+ if (stats.rx_dropped == ifobject->pkt_stream->nb_pkts / 2 - 1)
return TEST_PASS;
+ printf("%lld != %d\n", stats.rx_dropped, ifobject->pkt_stream->nb_pkts / 2 - 1);
return TEST_FAILURE;
}
@@ -1239,7 +1292,6 @@ static void thread_common_ops_tx(struct test_spec *test, struct ifobject *ifobje
{
xsk_configure_socket(test, ifobject, test->ifobj_rx->umem, true);
ifobject->xsk = &ifobject->xsk_arr[0];
- ifobject->xsk_map_fd = test->ifobj_rx->xsk_map_fd;
memcpy(ifobject->umem, test->ifobj_rx->umem, sizeof(struct xsk_umem_info));
}
@@ -1284,6 +1336,14 @@ static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
ifobject->ns_fd = switch_namespace(ifobject->nsname);
+ ifindex = if_nametoindex(ifobject->ifname);
+ if (!ifindex)
+ exit_with_error(errno);
+
+ ifobject->bpf_obj = xskxceiver__open_and_load();
+ if (libbpf_get_error(ifobject->bpf_obj))
+ exit_with_error(libbpf_get_error(ifobject->bpf_obj));
+
if (ifobject->umem->unaligned_mode)
mmap_flags |= MAP_HUGETLB;
@@ -1307,11 +1367,8 @@ static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
if (!ifobject->rx_on)
return;
- ifindex = if_nametoindex(ifobject->ifname);
- if (!ifindex)
- exit_with_error(errno);
-
- ret = xsk_setup_xdp_prog_xsk(ifobject->xsk->xsk, &ifobject->xsk_map_fd);
+ ifobject->ifindex = ifindex;
+ ret = bpf_attach(ifobject);
if (ret)
exit_with_error(-ret);
@@ -1321,19 +1378,17 @@ static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
if (ifobject->xdp_flags & XDP_FLAGS_SKB_MODE) {
if (opts.attach_mode != XDP_ATTACHED_SKB) {
- ksft_print_msg("ERROR: [%s] XDP prog not in SKB mode\n");
+ ksft_print_msg("ERROR: XDP prog not in SKB mode\n");
exit_with_error(-EINVAL);
}
} else if (ifobject->xdp_flags & XDP_FLAGS_DRV_MODE) {
if (opts.attach_mode != XDP_ATTACHED_DRV) {
- ksft_print_msg("ERROR: [%s] XDP prog not in DRV mode\n");
+ ksft_print_msg("ERROR: XDP prog not in DRV mode\n");
exit_with_error(-EINVAL);
}
}
- ret = xsk_socket__update_xskmap(ifobject->xsk->xsk, ifobject->xsk_map_fd);
- if (ret)
- exit_with_error(-ret);
+ bpf_update_xsk_map(ifobject, 0);
}
static void *worker_testapp_validate_tx(void *arg)
@@ -1372,8 +1427,7 @@ static void *worker_testapp_validate_rx(void *arg)
if (test->current_step == 1) {
thread_common_ops(test, ifobject);
} else {
- bpf_map_delete_elem(ifobject->xsk_map_fd, &id);
- xsk_socket__update_xskmap(ifobject->xsk->xsk, ifobject->xsk_map_fd);
+ bpf_update_xsk_map(ifobject, id);
}
fds.fd = xsk_socket__fd(ifobject->xsk->xsk);
@@ -1481,6 +1535,8 @@ static int testapp_validate_traffic(struct test_spec *test)
if (test->total_steps == test->current_step || test->fail) {
xsk_socket__delete(ifobj_tx->xsk->xsk);
xsk_socket__delete(ifobj_rx->xsk->xsk);
+ bpf_detach(ifobj_tx);
+ bpf_detach(ifobj_rx);
testapp_clean_xsk_umem(ifobj_rx);
if (!ifobj_tx->shared_umem)
testapp_clean_xsk_umem(ifobj_tx);
@@ -1531,16 +1587,12 @@ static void testapp_bidi(struct test_spec *test)
static void swap_xsk_resources(struct ifobject *ifobj_tx, struct ifobject *ifobj_rx)
{
- int ret;
-
xsk_socket__delete(ifobj_tx->xsk->xsk);
xsk_socket__delete(ifobj_rx->xsk->xsk);
ifobj_tx->xsk = &ifobj_tx->xsk_arr[1];
ifobj_rx->xsk = &ifobj_rx->xsk_arr[1];
- ret = xsk_socket__update_xskmap(ifobj_rx->xsk->xsk, ifobj_rx->xsk_map_fd);
- if (ret)
- exit_with_error(-ret);
+ bpf_update_xsk_map(ifobj_tx, 0);
}
static void testapp_bpf_res(struct test_spec *test)
@@ -1635,6 +1687,8 @@ static bool testapp_unaligned(struct test_spec *test)
{
if (!hugepages_present(test->ifobj_tx)) {
ksft_test_result_skip("No 2M huge pages present.\n");
+ bpf_detach(test->ifobj_tx);
+ bpf_detach(test->ifobj_rx);
return false;
}
@@ -1947,10 +2001,16 @@ int main(int argc, char **argv)
for (i = 0; i < modes; i++)
for (j = 0; j < TEST_TYPE_MAX; j++) {
+ if (j != TEST_TYPE_RUN_TO_COMPLETION_SINGLE_PKT) continue; // XXX
+ if (i != TEST_MODE_DRV) continue; // XXX
+
test_spec_init(&test, ifobj_tx, ifobj_rx, i);
run_pkt_test(&test, i, j);
usleep(USLEEP_MAX);
+ xskxceiver__destroy(ifobj_tx->bpf_obj);
+ xskxceiver__destroy(ifobj_rx->bpf_obj);
+
if (test.fail)
failed_tests++;
}
diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
index edb76d2def9f..c27dcbdb030f 100644
--- a/tools/testing/selftests/bpf/xskxceiver.h
+++ b/tools/testing/selftests/bpf/xskxceiver.h
@@ -5,6 +5,8 @@
#ifndef XSKXCEIVER_H_
#define XSKXCEIVER_H_
+#include "xskxceiver.skel.h"
+
#ifndef SOL_XDP
#define SOL_XDP 283
#endif
@@ -134,6 +136,7 @@ typedef void *(*thread_func_t)(void *arg);
struct ifobject {
char ifname[MAX_INTERFACE_NAME_CHARS];
char nsname[MAX_INTERFACES_NAMESPACE_CHARS];
+ struct xskxceiver *bpf_obj;
struct xsk_socket_info *xsk;
struct xsk_socket_info *xsk_arr;
struct xsk_umem_info *umem;
@@ -141,7 +144,7 @@ struct ifobject {
validation_func_t validation_func;
struct pkt_stream *pkt_stream;
int ns_fd;
- int xsk_map_fd;
+ int ifindex;
u32 dst_ip;
u32 src_ip;
u32 xdp_flags;
--
2.38.1.273.g43a17bfeac-goog
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