samples: net: sockets: tcp: Add a TCP sample and instructions

In order to run the TTCN-3 based sanity check, add a TCP
sample app and instructions for running the sanity check.

Signed-off-by: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>

samples/net/sockets/tcp/CMakeLists.txt

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(tcp)
+
+target_include_directories(app PRIVATE $ENV{ZEPHYR_BASE}/subsys/net/ip)
+
+target_sources(app PRIVATE src/main.c)

samples/net/sockets/tcp/README.rst

@@ -0,0 +1,43 @@
+.. _sockets-tcp-sample:
+
+TCP Sample for TTCN-3 based Sanity Check
+########################################
+
+Overview
+********
+
+This application is used together with the TTCN-3 based sanity check
+to validate the functionality of the experimental TCP (TCP2).
+
+Building, Running and executing TTCN-3 based Sanity Check for TCP2
+******************************************************************
+
+Compile and start the `net-test-tools`_:
+
+.. code-block:: console
+
+   ./autogen.sh
+   make
+   ./loop-slipcat.sh
+
+Build the TCP sample app:
+
+.. code-block:: console
+
+   cd samples/net/sockets/tcp
+   mkdir build && cd build
+   cmake -DBOARD=qemu_x86 -DOVERLAY_CONFIG="overlay-slip.conf" ..
+   make run
+
+Compile and run the TCP2 sanity check `net-test-suites`_:
+
+.. code-block:: console
+
+   . titan-install.sh
+   . titan-env.sh
+   cd src
+   . make.sh
+   ttcn3_start test_suite tcp2_check_3_runs.cfg
+
+.. _`net-test-tools`: https://github.com/intel/net-test-tools
+.. _`net-test-suites`: https://github.com/intel/net-test-suites

samples/net/sockets/tcp/overlay-debug.conf

@@ -0,0 +1,7 @@
+CONFIG_NO_OPTIMIZATIONS=y
+CONFIG_DEBUG=y
+
+CONFIG_ASSERT=y
+CONFIG_STACK_SENTINEL=y
+
+CONFIG_STACK_CANARIES=y

samples/net/sockets/tcp/overlay-e1000.conf

@@ -0,0 +1,7 @@
+# Overlay for experimental TCP as qemu_x86 with E1000
+
+CONFIG_PCIE=y
+CONFIG_ETH_E1000=y
+
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_QEMU_ETHERNET=y

samples/net/sockets/tcp/overlay-log-extra.conf

@@ -0,0 +1,6 @@
+#CONFIG_NET_IF_LOG_LEVEL_DBG=y
+#CONFIG_NET_L2_ETHERNET_LOG_LEVEL_DBG=y
+
+#CONFIG_SLIP_LOG_LEVEL_DBG=y
+
+CONFIG_ETHERNET_LOG_LEVEL_DBG=y

samples/net/sockets/tcp/overlay-log-extra2.conf

@@ -0,0 +1,6 @@
+#CONFIG_NET_IF_LOG_LEVEL_DBG=y
+#CONFIG_NET_L2_ETHERNET_LOG_LEVEL_DBG=y
+
+CONFIG_SLIP_LOG_LEVEL_DBG=y
+
+CONFIG_ETH_E1000_VERBOSE_DEBUG=y

samples/net/sockets/tcp/overlay-log-pkt.conf

@@ -0,0 +1,4 @@
+CONFIG_NET_PKT_LOG_LEVEL_DBG=y
+
+CONFIG_NET_BUF_LOG=y
+CONFIG_NET_BUF_LOG_LEVEL_DBG=y

samples/net/sockets/tcp/overlay-log.conf

@@ -0,0 +1,14 @@
+CONFIG_LOG=y
+CONFIG_LOG_IMMEDIATE=y
+CONFIG_LOG_BACKEND_SHOW_COLOR=n
+
+CONFIG_NET_LOG=y
+
+#CONFIG_NET_IF_LOG_LEVEL_DBG=y
+#CONFIG_NET_L2_ETHERNET_LOG_LEVEL_DBG=y
+
+CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y
+CONFIG_NET_CONN_LOG_LEVEL_DBG=y
+CONFIG_NET_CONTEXT_LOG_LEVEL_DBG=y
+
+CONFIG_NET_TCP_LOG_LEVEL_DBG=y

samples/net/sockets/tcp/overlay-max-stacks.conf

@@ -0,0 +1,10 @@
+CONFIG_NET_MGMT_EVENT_STACK_SIZE=65535
+CONFIG_PRIVILEGED_STACK_SIZE=65535
+CONFIG_NET_TX_STACK_SIZE=130944
+CONFIG_NET_RX_STACK_SIZE=130944
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=65535
+CONFIG_MAIN_STACK_SIZE=65535
+CONFIG_IDLE_STACK_SIZE=65535
+CONFIG_ISR_STACK_SIZE=65535
+CONFIG_OFFLOAD_WORKQUEUE_STACK_SIZE=65535
+CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=65535

samples/net/sockets/tcp/overlay-nommu.conf

@@ -0,0 +1 @@
+CONFIG_X86_MMU=n

samples/net/sockets/tcp/overlay-slip.conf

@@ -0,0 +1,4 @@
+# Overlay for experimental TCP as qemu_x86 target against the sanity check
+
+CONFIG_NET_SLIP_TAP=y
+CONFIG_SLIP_MAC_ADDR="00:00:00:00:00:01"

samples/net/sockets/tcp/prj.conf

@@ -0,0 +1,26 @@
+CONFIG_NEWLIB_LIBC=y
+
+CONFIG_NETWORKING=y
+
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POSIX_NAMES=y
+
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+
+CONFIG_NET_CONFIG_SETTINGS=y
+
+CONFIG_NET_CONFIG_MY_IPV4_ADDR="192.0.2.1"
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR="192.0.2.2"
+
+CONFIG_NET_CONFIG_MY_IPV6_ADDR="2001:db8::1"
+CONFIG_NET_CONFIG_PEER_IPV6_ADDR="2001:db8::2"
+
+CONFIG_NET_TCP=y
+CONFIG_NET_TCP2=y
+
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+
+CONFIG_JSON_LIBRARY=y
+
+CONFIG_NET_TEST_PROTOCOL=y

samples/net/sockets/tcp/sample.yaml

@@ -0,0 +1,3 @@
+sample:
+  description: A sample for running TTCN-3 based sanity check for TCP2
+  name: tcp

samples/net/sockets/tcp/src/main.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2020 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* TCP Sample for TTCN-3 based Sanity Check */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <net/socket.h>
+
+#include <data/json.h>
+#include <tp.h>
+
+#define UDP_PORT 4242
+
+#define perror(fmt, args...)						\
+do {									\
+	printf("Error: " fmt "(): %s\n" ## args, strerror(errno));	\
+	exit(errno);							\
+} while (0)								\
+
+/*
+ * This application is used together with the TTCN-3 based sanity check
+ * to validate the functionality of the experimental TCP (TCP2).
+ *
+ * samples/net/sockets/tcp/README.rst
+ *
+ * Eventually UDP based test protocol might be terminated in the user space
+ * (see udp() below), but at the moment it's just a dummy loop
+ * to keep the sample running in order to execute TTCN-3 TCP2 sanity check.
+ */
+void main(void)
+{
+	while (true) {
+		k_sleep(K_SECONDS(1));
+	}
+}
+
+void udp(void)
+{
+	int fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+	if (fd < 0) {
+		perror("socket");
+	}
+
+	{
+		struct sockaddr_in sin;
+
+		sin.sin_family = AF_INET;
+		sin.sin_addr.s_addr = htonl(INADDR_ANY);
+		sin.sin_port = htons(UDP_PORT);
+
+		if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+			perror("bind");
+		}
+
+		printf("Listening on UDP port %d\n", UDP_PORT);
+	}
+
+	{
+#ifndef BUF_SIZE
+#define BUF_SIZE 4096
+#endif
+		char *buf = malloc(BUF_SIZE);
+
+		if (buf == NULL) {
+			perror("malloc");
+		}
+
+		for (;;) {
+			ssize_t len = recv(fd, buf, BUF_SIZE, 0);
+
+			if (len < 0) {
+				perror("recv");
+			}
+
+			printf("Received %ld bytes\n", (long)len);
+		}
+	}
+}