bus/vdev: implement device iteration

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>

drivers/bus/vdev/Makefile

@@ -19,8 +19,9 @@ EXPORT_MAP := rte_bus_vdev_version.map
 LIBABIVER := 1
 
 SRCS-y += vdev.c
+SRCS-y += vdev_params.c
 
-LDLIBS += -lrte_eal
+LDLIBS += -lrte_eal -lrte_kvargs
 
 #
 # Export include files

drivers/bus/vdev/meson.build

@@ -1,7 +1,10 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-sources = files('vdev.c')
+sources = files('vdev.c',
+	'vdev_params.c')
 install_headers('rte_bus_vdev.h')
 
 allow_experimental_apis = true
+
+deps += ['kvargs']

drivers/bus/vdev/vdev.c

@@ -23,6 +23,7 @@
 
 #include "rte_bus_vdev.h"
 #include "vdev_logs.h"
+#include "vdev_private.h"
 
 #define VDEV_MP_KEY	"bus_vdev_mp"
 
@@ -497,9 +498,9 @@ vdev_probe(void)
 	return ret;
 }
 
-static struct rte_device *
-vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
-		 const void *data)
+struct rte_device *
+rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
+		     const void *data)
 {
 	const struct rte_vdev_device *vstart;
 	struct rte_vdev_device *dev;
@@ -536,10 +537,11 @@ vdev_unplug(struct rte_device *dev)
 static struct rte_bus rte_vdev_bus = {
 	.scan = vdev_scan,
 	.probe = vdev_probe,
-	.find_device = vdev_find_device,
+	.find_device = rte_vdev_find_device,
 	.plug = vdev_plug,
 	.unplug = vdev_unplug,
 	.parse = vdev_parse,
+	.dev_iterate = rte_vdev_dev_iterate,
 };
 
 RTE_REGISTER_BUS(vdev, rte_vdev_bus);

drivers/bus/vdev/vdev_params.c

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Gaëtan Rivet
+ */
+
+#include <rte_dev.h>
+#include <rte_bus.h>
+#include <rte_kvargs.h>
+#include <rte_errno.h>
+
+#include "vdev_logs.h"
+#include "vdev_private.h"
+
+enum vdev_params {
+	RTE_VDEV_PARAMS_MAX,
+};
+
+static const char * const vdev_params_keys[] = {
+	[RTE_VDEV_PARAMS_MAX] = NULL,
+};
+
+static int
+vdev_dev_match(const struct rte_device *dev,
+	       const void *_kvlist)
+{
+	const struct rte_kvargs *kvlist = _kvlist;
+
+	(void) kvlist;
+	(void) dev;
+	return 0;
+}
+
+void *
+rte_vdev_dev_iterate(const void *start,
+		     const char *str,
+		     const struct rte_dev_iterator *it __rte_unused)
+{
+	struct rte_kvargs *kvargs = NULL;
+	struct rte_device *dev;
+
+	if (str != NULL) {
+		kvargs = rte_kvargs_parse(str, vdev_params_keys);
+		if (kvargs == NULL) {
+			VDEV_LOG(ERR, "cannot parse argument list\n");
+			rte_errno = EINVAL;
+			return NULL;
+		}
+	}
+	dev = rte_vdev_find_device(start, vdev_dev_match, kvargs);
+	rte_kvargs_free(kvargs);
+	return dev;
+}

drivers/bus/vdev/vdev_private.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Gaëtan Rivet
+ */
+
+#ifndef _VDEV_PRIVATE_H_
+#define _VDEV_PRIVATE_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct rte_device *
+rte_vdev_find_device(const struct rte_device *start,
+		     rte_dev_cmp_t cmp,
+		     const void *data);
+
+void *
+rte_vdev_dev_iterate(const void *start,
+		     const char *str,
+		     const struct rte_dev_iterator *it);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _VDEV_PRIVATE_H_ */