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Date: Sat, 31 Oct 2020 11:52:37 -0700
From: Alexander Duyck <alexander.duyck@...il.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, kafai@...com,
john.fastabend@...il.com, kernel-team@...com,
netdev@...r.kernel.org, edumazet@...gle.com, brakmo@...com,
andrii.nakryiko@...il.com, alexanderduyck@...com
Subject: [bpf-next PATCH v2 5/5] selftest/bpf: Use global variables instead of
maps for test_tcpbpf_kern
From: Alexander Duyck <alexanderduyck@...com>
Use global variables instead of global_map and sockopt_results_map to track
test data. Doing this greatly simplifies the code as there is not need to
take the extra steps of updating the maps or looking up elements.
Suggested-by: Martin KaFai Lau <kafai@...com>
Signed-off-by: Alexander Duyck <alexanderduyck@...com>
---
.../testing/selftests/bpf/prog_tests/tcpbpf_user.c | 53 ++++--------
.../testing/selftests/bpf/progs/test_tcpbpf_kern.c | 86 +++-----------------
tools/testing/selftests/bpf/test_tcpbpf.h | 2
3 files changed, 31 insertions(+), 110 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
index c7a61b0d616a..bceca6fce09a 100644
--- a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
+++ b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
@@ -11,7 +11,7 @@
static __u32 duration;
-static void verify_result(int map_fd, int sock_map_fd)
+static void verify_result(struct tcpbpf_globals *result)
{
__u32 expected_events = ((1 << BPF_SOCK_OPS_TIMEOUT_INIT) |
(1 << BPF_SOCK_OPS_RWND_INIT) |
@@ -21,48 +21,31 @@ static void verify_result(int map_fd, int sock_map_fd)
(1 << BPF_SOCK_OPS_NEEDS_ECN) |
(1 << BPF_SOCK_OPS_STATE_CB) |
(1 << BPF_SOCK_OPS_TCP_LISTEN_CB));
- struct tcpbpf_globals result = { 0 };
- __u32 key = 0;
- int res;
- int rv;
-
- rv = bpf_map_lookup_elem(map_fd, &key, &result);
- if (CHECK(rv, "bpf_map_lookup_elem(map_fd)", "err:%d errno:%d",
- rv, errno))
- return;
/* check global map */
- CHECK(expected_events != result.event_map, "event_map",
+ CHECK(expected_events != result->event_map, "event_map",
"unexpected event_map: actual %#" PRIx32" != expected %#" PRIx32 "\n",
- result.event_map, expected_events);
+ result->event_map, expected_events);
- ASSERT_EQ(result.bytes_received, 501, "bytes_received");
- ASSERT_EQ(result.bytes_acked, 1002, "bytes_acked");
- ASSERT_EQ(result.data_segs_in, 1, "data_segs_in");
- ASSERT_EQ(result.data_segs_out, 1, "data_segs_out");
- ASSERT_EQ(result.bad_cb_test_rv, 0x80, "bad_cb_test_rv");
- ASSERT_EQ(result.good_cb_test_rv, 0, "good_cb_test_rv");
- ASSERT_EQ(result.num_listen, 1, "num_listen");
+ ASSERT_EQ(result->bytes_received, 501, "bytes_received");
+ ASSERT_EQ(result->bytes_acked, 1002, "bytes_acked");
+ ASSERT_EQ(result->data_segs_in, 1, "data_segs_in");
+ ASSERT_EQ(result->data_segs_out, 1, "data_segs_out");
+ ASSERT_EQ(result->bad_cb_test_rv, 0x80, "bad_cb_test_rv");
+ ASSERT_EQ(result->good_cb_test_rv, 0, "good_cb_test_rv");
+ ASSERT_EQ(result->num_listen, 1, "num_listen");
/* 3 comes from one listening socket + both ends of the connection */
- ASSERT_EQ(result.num_close_events, 3, "num_close_events");
+ ASSERT_EQ(result->num_close_events, 3, "num_close_events");
/* check setsockopt for SAVE_SYN */
- key = 0;
- rv = bpf_map_lookup_elem(sock_map_fd, &key, &res);
- CHECK(rv, "bpf_map_lookup_elem(sock_map_fd)", "err:%d errno:%d",
- rv, errno);
- ASSERT_EQ(res, 0, "bpf_setsockopt(TCP_SAVE_SYN)");
+ ASSERT_EQ(result->tcp_save_syn, 0, "tcp_save_syn");
/* check getsockopt for SAVED_SYN */
- key = 1;
- rv = bpf_map_lookup_elem(sock_map_fd, &key, &res);
- CHECK(rv, "bpf_map_lookup_elem(sock_map_fd)", "err:%d errno:%d",
- rv, errno);
- ASSERT_EQ(res, 1, "bpf_getsockopt(TCP_SAVED_SYN)");
+ ASSERT_EQ(result->tcp_saved_syn, 1, "tcp_saved_syn");
}
-static void run_test(int map_fd, int sock_map_fd)
+static void run_test(struct tcpbpf_globals *result)
{
int listen_fd = -1, cli_fd = -1, accept_fd = -1;
char buf[1000];
@@ -129,13 +112,12 @@ static void run_test(int map_fd, int sock_map_fd)
close(listen_fd);
if (!err)
- verify_result(map_fd, sock_map_fd);
+ verify_result(result);
}
void test_tcpbpf_user(void)
{
struct test_tcpbpf_kern *skel;
- int map_fd, sock_map_fd;
int cg_fd = -1;
skel = test_tcpbpf_kern__open_and_load();
@@ -147,14 +129,11 @@ void test_tcpbpf_user(void)
"cg_fd:%d errno:%d", cg_fd, errno))
goto cleanup_skel;
- map_fd = bpf_map__fd(skel->maps.global_map);
- sock_map_fd = bpf_map__fd(skel->maps.sockopt_results);
-
skel->links.bpf_testcb = bpf_program__attach_cgroup(skel->progs.bpf_testcb, cg_fd);
if (ASSERT_OK_PTR(skel->links.bpf_testcb, "attach_cgroup(bpf_testcb)"))
goto cleanup_namespace;
- run_test(map_fd, sock_map_fd);
+ run_test(&skel->bss->global);
cleanup_namespace:
if (cg_fd != -1)
diff --git a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
index 3e6912e4df3d..c0250142e1f6 100644
--- a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c
@@ -14,40 +14,7 @@
#include <bpf/bpf_endian.h>
#include "test_tcpbpf.h"
-struct {
- __uint(type, BPF_MAP_TYPE_ARRAY);
- __uint(max_entries, 4);
- __type(key, __u32);
- __type(value, struct tcpbpf_globals);
-} global_map SEC(".maps");
-
-struct {
- __uint(type, BPF_MAP_TYPE_ARRAY);
- __uint(max_entries, 2);
- __type(key, __u32);
- __type(value, int);
-} sockopt_results SEC(".maps");
-
-static inline void update_event_map(int event)
-{
- __u32 key = 0;
- struct tcpbpf_globals g, *gp;
-
- gp = bpf_map_lookup_elem(&global_map, &key);
- if (gp == NULL) {
- struct tcpbpf_globals g = {0};
-
- g.event_map |= (1 << event);
- bpf_map_update_elem(&global_map, &key, &g,
- BPF_ANY);
- } else {
- g = *gp;
- g.event_map |= (1 << event);
- bpf_map_update_elem(&global_map, &key, &g,
- BPF_ANY);
- }
-}
-
+struct tcpbpf_globals global = { 0 };
int _version SEC("version") = 1;
SEC("sockops")
@@ -105,29 +72,15 @@ int bpf_testcb(struct bpf_sock_ops *skops)
op = (int) skops->op;
- update_event_map(op);
+ global.event_map |= (1 << op);
switch (op) {
case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
/* Test failure to set largest cb flag (assumes not defined) */
- bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
+ global.bad_cb_test_rv = bpf_sock_ops_cb_flags_set(skops, 0x80);
/* Set callback */
- good_call_rv = bpf_sock_ops_cb_flags_set(skops,
+ global.good_cb_test_rv = bpf_sock_ops_cb_flags_set(skops,
BPF_SOCK_OPS_STATE_CB_FLAG);
- /* Update results */
- {
- __u32 key = 0;
- struct tcpbpf_globals g, *gp;
-
- gp = bpf_map_lookup_elem(&global_map, &key);
- if (!gp)
- break;
- g = *gp;
- g.bad_cb_test_rv = bad_call_rv;
- g.good_cb_test_rv = good_call_rv;
- bpf_map_update_elem(&global_map, &key, &g,
- BPF_ANY);
- }
break;
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
skops->sk_txhash = 0x12345f;
@@ -143,10 +96,8 @@ int bpf_testcb(struct bpf_sock_ops *skops)
thdr = (struct tcphdr *)(header + offset);
v = thdr->syn;
- __u32 key = 1;
- bpf_map_update_elem(&sockopt_results, &key, &v,
- BPF_ANY);
+ global.tcp_saved_syn = v;
}
}
break;
@@ -156,25 +107,16 @@ int bpf_testcb(struct bpf_sock_ops *skops)
break;
case BPF_SOCK_OPS_STATE_CB:
if (skops->args[1] == BPF_TCP_CLOSE) {
- __u32 key = 0;
- struct tcpbpf_globals g, *gp;
-
- gp = bpf_map_lookup_elem(&global_map, &key);
- if (!gp)
- break;
- g = *gp;
if (skops->args[0] == BPF_TCP_LISTEN) {
- g.num_listen++;
+ global.num_listen++;
} else {
- g.total_retrans = skops->total_retrans;
- g.data_segs_in = skops->data_segs_in;
- g.data_segs_out = skops->data_segs_out;
- g.bytes_received = skops->bytes_received;
- g.bytes_acked = skops->bytes_acked;
+ global.total_retrans = skops->total_retrans;
+ global.data_segs_in = skops->data_segs_in;
+ global.data_segs_out = skops->data_segs_out;
+ global.bytes_received = skops->bytes_received;
+ global.bytes_acked = skops->bytes_acked;
}
- g.num_close_events++;
- bpf_map_update_elem(&global_map, &key, &g,
- BPF_ANY);
+ global.num_close_events++;
}
break;
case BPF_SOCK_OPS_TCP_LISTEN_CB:
@@ -182,9 +124,7 @@ int bpf_testcb(struct bpf_sock_ops *skops)
v = bpf_setsockopt(skops, IPPROTO_TCP, TCP_SAVE_SYN,
&save_syn, sizeof(save_syn));
/* Update global map w/ result of setsock opt */
- __u32 key = 0;
-
- bpf_map_update_elem(&sockopt_results, &key, &v, BPF_ANY);
+ global.tcp_save_syn = v;
break;
default:
rv = -1;
diff --git a/tools/testing/selftests/bpf/test_tcpbpf.h b/tools/testing/selftests/bpf/test_tcpbpf.h
index 6220b95cbd02..0ed33521cbbb 100644
--- a/tools/testing/selftests/bpf/test_tcpbpf.h
+++ b/tools/testing/selftests/bpf/test_tcpbpf.h
@@ -14,5 +14,7 @@ struct tcpbpf_globals {
__u64 bytes_acked;
__u32 num_listen;
__u32 num_close_events;
+ __u32 tcp_save_syn;
+ __u32 tcp_saved_syn;
};
#endif
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