app/test: introduce resources for tests

Certain internal mechanisms of DPDK access different file system
structures (e.g. /sys/bus/pci/devices). It is difficult to test
those cases automatically by a unit test when such path is not
hard-coded and there is no simple way how to distribute fake ones
with the current testing environment.

This patch adds a possibility to declare a resource embedded in
the test binary itself. The structure resource cover the generic
situation - it provides a name for lookup and pointers to the
embedded data blob. A resource is registered in a constructor by
the macro REGISTER_RESOURCE.

Some initial tests of simple resources is included and added into
the group_1.

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>

MAINTAINERS

@@ -554,9 +554,11 @@ F: app/test/commands.c
 F: app/test/packet_burst_generator.c
 F: app/test/packet_burst_generator.h
 F: app/test/process.h
+F: app/test/resource.*
 F: app/test/test.c
 F: app/test/test.h
 F: app/test/test_pmd_perf.c
+F: app/test/test_resource.c
 F: app/test/virtual_pmd.c
 F: app/test/virtual_pmd.h
 

app/test/Makefile

@@ -43,6 +43,8 @@ APP = test
 #
 SRCS-$(CONFIG_RTE_LIBRTE_CMDLINE) := commands.c
 SRCS-y += test.c
+SRCS-y += resource.c
+SRCS-y += test_resource.c
 SRCS-y += test_pci.c
 SRCS-y += test_prefetch.c
 SRCS-y += test_byteorder.c

app/test/autotest_data.py

@@ -93,6 +93,12 @@ parallel_test_group_list = [
 		 "Func" :	default_autotest,
 		 "Report" :	None,
 		},
+		{
+		 "Name" :	"Resource autotest",
+		 "Command" :	"resource_autotest",
+		 "Func" :	default_autotest,
+		 "Report" :	None,
+		},
 		{
 		 "Name" :	"Dump rings",
 		 "Command" :	"dump_ring",

app/test/resource.c

@@ -0,0 +1,66 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 RehiveTech. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of RehiveTech nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_debug.h>
+
+#include "resource.h"
+
+struct resource_list resource_list = TAILQ_HEAD_INITIALIZER(resource_list);
+
+size_t resource_size(const struct resource *r)
+{
+	return r->end - r->begin;
+}
+
+const struct resource *resource_find(const char *name)
+{
+	struct resource *r;
+
+	TAILQ_FOREACH(r, &resource_list, next) {
+		RTE_VERIFY(r->name);
+
+		if (!strcmp(r->name, name))
+			return r;
+	}
+
+	return NULL;
+}
+
+void resource_register(struct resource *r)
+{
+	TAILQ_INSERT_TAIL(&resource_list, r, next);
+}

app/test/resource.h

@@ -0,0 +1,98 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 RehiveTech. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of RehiveTech nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RESOURCE_H_
+#define _RESOURCE_H_
+
+/**
+ * @file
+ *
+ * Test Resource API
+ *
+ * Each test can require and use some external resources. Usually, an external
+ * resource is a file or a filesystem sub-hierarchy. A resource is included
+ * inside the test executable.
+ */
+
+#include <sys/queue.h>
+#include <stddef.h>
+
+#include <rte_eal.h>
+#include <rte_common.h>
+
+TAILQ_HEAD(resource_list, resource);
+extern struct resource_list resource_list;
+
+/**
+ * Representation of a resource. It points to the resource's binary data.
+ * The semantics of the binary data are defined by the target test.
+ */
+struct resource {
+	const char *name;  /**< Unique name of the resource */
+	const char *begin; /**< Start of resource data */
+	const char *end;   /**< End of resource data */
+	TAILQ_ENTRY(resource) next;
+};
+
+/**
+ * @return size of the given resource
+ */
+size_t resource_size(const struct resource *r);
+
+/**
+ * Find a resource by name in the global list of resources.
+ */
+const struct resource *resource_find(const char *name);
+
+/**
+ * Register a resource in the global list of resources.
+ * Not intended for direct use, please check the REGISTER_RESOURCE
+ * macro.
+ */
+void resource_register(struct resource *r);
+
+/**
+ * Definition of a resource described by its name, and pointers begin, end.
+ */
+#define REGISTER_RESOURCE(n, b, e) \
+static struct resource linkres_ ##n = {       \
+	.name = RTE_STR(n),     \
+	.begin = b,             \
+	.end = e,               \
+};                              \
+static void __attribute__((constructor, used)) resinitfn_ ##n(void) \
+{                               \
+	resource_register(&linkres_ ##n);  \
+}
+
+#endif

app/test/test_resource.c

@@ -0,0 +1,75 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 RehiveTech. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of RehiveTech nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "test.h"
+#include "resource.h"
+
+const char test_resource_dpdk_blob[] = {
+	'\x44', '\x50', '\x44', '\x4b', '\x00'
+};
+
+REGISTER_RESOURCE(test_resource_dpdk,
+		test_resource_dpdk_blob, test_resource_dpdk_blob + 4);
+
+static int test_resource_dpdk(void)
+{
+	const struct resource *r;
+
+	r = resource_find("test_resource_dpdk");
+	TEST_ASSERT_NOT_NULL(r, "Could not find test_resource_dpdk");
+	TEST_ASSERT(!strcmp(r->name, "test_resource_dpdk"),
+			"Found resource %s, expected test_resource_dpdk",
+			r->name);
+
+	TEST_ASSERT(!strncmp("DPDK", r->begin, 4),
+			"Unexpected payload: %.4s...", r->begin);
+
+	return 0;
+}
+
+static int test_resource(void)
+{
+	if (test_resource_dpdk())
+		return -1;
+
+	return 0;
+}
+
+static struct test_command resource_cmd = {
+	.command = "resource_autotest",
+	.callback = test_resource,
+};
+REGISTER_TEST_COMMAND(resource_cmd);