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Message-ID: <20200320152107.2169904-1-kafai@fb.com>
Date: Fri, 20 Mar 2020 08:21:07 -0700
From: Martin KaFai Lau <kafai@...com>
To: <bpf@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
<netdev@...r.kernel.org>
Subject: [PATCH v2 bpf-next 2/2] bpf: Add tests for bpf_sk_storage to bpf_tcp_ca
This patch adds test to exercise the bpf_sk_storage_get()
and bpf_sk_storage_delete() helper from the bpf_dctcp.c.
The setup and check on the sk_storage is done immediately
before and after the connect().
This patch also takes this chance to move the pthread_create()
after the connect() has been done. That will remove the need of
the "wait_thread" label.
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
.../selftests/bpf/prog_tests/bpf_tcp_ca.c | 39 +++++++++++++++----
tools/testing/selftests/bpf/progs/bpf_dctcp.c | 16 ++++++++
2 files changed, 47 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
index 8482bbc67eec..9a8f47fc0b91 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -11,6 +11,7 @@
static const unsigned int total_bytes = 10 * 1024 * 1024;
static const struct timeval timeo_sec = { .tv_sec = 10 };
static const size_t timeo_optlen = sizeof(timeo_sec);
+static int expected_stg = 0xeB9F;
static int stop, duration;
static int settimeo(int fd)
@@ -88,7 +89,7 @@ static void *server(void *arg)
return NULL;
}
-static void do_test(const char *tcp_ca)
+static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
{
struct sockaddr_in6 sa6 = {};
ssize_t nr_recv = 0, bytes = 0;
@@ -126,14 +127,34 @@ static void do_test(const char *tcp_ca)
err = listen(lfd, 1);
if (CHECK(err == -1, "listen", "errno:%d\n", errno))
goto done;
- err = pthread_create(&srv_thread, NULL, server, (void *)(long)lfd);
- if (CHECK(err != 0, "pthread_create", "err:%d\n", err))
- goto done;
+
+ if (sk_stg_map) {
+ err = bpf_map_update_elem(bpf_map__fd(sk_stg_map), &fd,
+ &expected_stg, BPF_NOEXIST);
+ if (CHECK(err, "bpf_map_update_elem(sk_stg_map)",
+ "err:%d errno:%d\n", err, errno))
+ goto done;
+ }
/* connect to server */
err = connect(fd, (struct sockaddr *)&sa6, addrlen);
if (CHECK(err == -1, "connect", "errno:%d\n", errno))
- goto wait_thread;
+ goto done;
+
+ if (sk_stg_map) {
+ int tmp_stg;
+
+ err = bpf_map_lookup_elem(bpf_map__fd(sk_stg_map), &fd,
+ &tmp_stg);
+ if (CHECK(!err || errno != ENOENT,
+ "bpf_map_lookup_elem(sk_stg_map)",
+ "err:%d errno:%d\n", err, errno))
+ goto done;
+ }
+
+ err = pthread_create(&srv_thread, NULL, server, (void *)(long)lfd);
+ if (CHECK(err != 0, "pthread_create", "err:%d errno:%d\n", err, errno))
+ goto done;
/* recv total_bytes */
while (bytes < total_bytes && !READ_ONCE(stop)) {
@@ -149,7 +170,6 @@ static void do_test(const char *tcp_ca)
CHECK(bytes != total_bytes, "recv", "%zd != %u nr_recv:%zd errno:%d\n",
bytes, total_bytes, nr_recv, errno);
-wait_thread:
WRITE_ONCE(stop, 1);
pthread_join(srv_thread, &thread_ret);
CHECK(IS_ERR(thread_ret), "pthread_join", "thread_ret:%ld",
@@ -175,7 +195,7 @@ static void test_cubic(void)
return;
}
- do_test("bpf_cubic");
+ do_test("bpf_cubic", NULL);
bpf_link__destroy(link);
bpf_cubic__destroy(cubic_skel);
@@ -197,7 +217,10 @@ static void test_dctcp(void)
return;
}
- do_test("bpf_dctcp");
+ do_test("bpf_dctcp", dctcp_skel->maps.sk_stg_map);
+ CHECK(dctcp_skel->bss->stg_result != expected_stg,
+ "Unexpected stg_result", "stg_result (%x) != expected_stg (%x)\n",
+ dctcp_skel->bss->stg_result, expected_stg);
bpf_link__destroy(link);
bpf_dctcp__destroy(dctcp_skel);
diff --git a/tools/testing/selftests/bpf/progs/bpf_dctcp.c b/tools/testing/selftests/bpf/progs/bpf_dctcp.c
index 127ea762a062..3fb4260570b1 100644
--- a/tools/testing/selftests/bpf/progs/bpf_dctcp.c
+++ b/tools/testing/selftests/bpf/progs/bpf_dctcp.c
@@ -6,6 +6,7 @@
* the kernel BPF logic.
*/
+#include <stddef.h>
#include <linux/bpf.h>
#include <linux/types.h>
#include <bpf/bpf_helpers.h>
@@ -14,6 +15,15 @@
char _license[] SEC("license") = "GPL";
+int stg_result = 0;
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SK_STORAGE);
+ __uint(map_flags, BPF_F_NO_PREALLOC);
+ __type(key, int);
+ __type(value, int);
+} sk_stg_map SEC(".maps");
+
#define DCTCP_MAX_ALPHA 1024U
struct dctcp {
@@ -43,12 +53,18 @@ void BPF_PROG(dctcp_init, struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct dctcp *ca = inet_csk_ca(sk);
+ int *stg;
ca->prior_rcv_nxt = tp->rcv_nxt;
ca->dctcp_alpha = min(dctcp_alpha_on_init, DCTCP_MAX_ALPHA);
ca->loss_cwnd = 0;
ca->ce_state = 0;
+ stg = bpf_sk_storage_get(&sk_stg_map, (void *)tp, NULL, 0);
+ if (stg) {
+ stg_result = *stg;
+ bpf_sk_storage_delete(&sk_stg_map, (void *)tp);
+ }
dctcp_reset(tp, ca);
}
--
2.17.1
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