[PATCH bpf-next v2 2/5] selftests/bpf: adopt accept_timeout from sockmap_listen

[Stanislav Fomichev <sdf@google.com>]

Move accept_timeout and recv_timeout to the common place so they
can be reused by the other tests. Switch to accept_timeout() in
test_progs instead of doing while loop around accept().

This prevents the tests that use start_server_thread/stop_server_thread
from being stuck when the error occurs.

Cc: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
 tools/testing/selftests/bpf/network_helpers.c | 43 +++++++++++++++----
 tools/testing/selftests/bpf/network_helpers.h |  4 ++
 .../selftests/bpf/prog_tests/sockmap_listen.c | 35 +--------------
 3 files changed, 40 insertions(+), 42 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index ee9386b033ed..30ef0c7edebf 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -82,14 +82,7 @@ static void *server_thread(void *arg)
 		return ERR_PTR(err);
 	}
 
-	while (true) {
-		client_fd = accept(fd, (struct sockaddr *)&addr, &len);
-		if (client_fd == -1 && errno == EAGAIN) {
-			usleep(50);
-			continue;
-		}
-		break;
-	}
+	client_fd = accept_timeout(fd, (struct sockaddr *)&addr, &len, 3);
 	if (CHECK_FAIL(client_fd < 0)) {
 		perror("Failed to accept client");
 		return ERR_PTR(err);
@@ -162,3 +155,37 @@ int connect_to_fd(int family, int server_fd)
 	close(fd);
 	return -1;
 }
+
+static int poll_read(int fd, unsigned int timeout_sec)
+{
+	struct timeval timeout = { .tv_sec = timeout_sec };
+	fd_set rfds;
+	int r;
+
+	FD_ZERO(&rfds);
+	FD_SET(fd, &rfds);
+
+	r = select(fd + 1, &rfds, NULL, NULL, &timeout);
+	if (r == 0)
+		errno = ETIME;
+
+	return r == 1 ? 0 : -1;
+}
+
+int accept_timeout(int fd, struct sockaddr *addr, socklen_t *len,
+		   unsigned int timeout_sec)
+{
+	if (poll_read(fd, timeout_sec))
+		return -1;
+
+	return accept(fd, addr, len);
+}
+
+int recv_timeout(int fd, void *buf, size_t len, int flags,
+		 unsigned int timeout_sec)
+{
+	if (poll_read(fd, timeout_sec))
+		return -1;
+
+	return recv(fd, buf, len, flags);
+}
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 1f3942160287..74e2c40667a2 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -7,5 +7,9 @@
 int start_server_thread(int family);
 void stop_server_thread(int fd);
 int connect_to_fd(int family, int server_fd);
+int accept_timeout(int fd, struct sockaddr *addr, socklen_t *len,
+		   unsigned int timeout_sec);
+int recv_timeout(int fd, void *buf, size_t len, int flags,
+		 unsigned int timeout_sec);
 
 #endif
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c b/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
index d7d65a700799..c2a78d8a110e 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
@@ -24,6 +24,7 @@
 
 #include "bpf_util.h"
 #include "test_progs.h"
+#include "network_helpers.h"
 #include "test_sockmap_listen.skel.h"
 
 #define IO_TIMEOUT_SEC 30
@@ -195,40 +196,6 @@
 		__ret;                                                         \
 	})
 
-static int poll_read(int fd, unsigned int timeout_sec)
-{
-	struct timeval timeout = { .tv_sec = timeout_sec };
-	fd_set rfds;
-	int r;
-
-	FD_ZERO(&rfds);
-	FD_SET(fd, &rfds);
-
-	r = select(fd + 1, &rfds, NULL, NULL, &timeout);
-	if (r == 0)
-		errno = ETIME;
-
-	return r == 1 ? 0 : -1;
-}
-
-static int accept_timeout(int fd, struct sockaddr *addr, socklen_t *len,
-			  unsigned int timeout_sec)
-{
-	if (poll_read(fd, timeout_sec))
-		return -1;
-
-	return accept(fd, addr, len);
-}
-
-static int recv_timeout(int fd, void *buf, size_t len, int flags,
-			unsigned int timeout_sec)
-{
-	if (poll_read(fd, timeout_sec))
-		return -1;
-
-	return recv(fd, buf, len, flags);
-}
-
 static void init_addr_loopback4(struct sockaddr_storage *ss, socklen_t *len)
 {
 	struct sockaddr_in *addr4 = memset(ss, 0, sizeof(*ss));
-- 
2.26.2.526.g744177e7f7-goog