X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Fcommon%2Feal_common_vdev.c;h=7b857a6ba4cba5de7cc01f65a6c0c704c5616880;hb=f3a1188cee4a5f2599fb88f17b237fbe03127d6e;hp=7d6e54f44693fcec27ecf16b2431c3fa6dc56119;hpb=c431384c8fbf8503693bcae1bdcd58d6fa459b8a;p=dpdk.git

diff --git a/lib/librte_eal/common/eal_common_vdev.c b/lib/librte_eal/common/eal_common_vdev.c
index 7d6e54f446..7b857a6ba4 100644
--- a/lib/librte_eal/common/eal_common_vdev.c
+++ b/lib/librte_eal/common/eal_common_vdev.c
@@ -35,90 +35,342 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include <sys/queue.h>
 
+#include <rte_eal.h>
+#include <rte_dev.h>
+#include <rte_bus.h>
 #include <rte_vdev.h>
 #include <rte_common.h>
+#include <rte_devargs.h>
+#include <rte_memory.h>
+#include <rte_errno.h>
 
+/** Double linked list of virtual device drivers. */
+TAILQ_HEAD(vdev_device_list, rte_vdev_device);
+
+static struct vdev_device_list vdev_device_list =
+	TAILQ_HEAD_INITIALIZER(vdev_device_list);
 struct vdev_driver_list vdev_driver_list =
 	TAILQ_HEAD_INITIALIZER(vdev_driver_list);
 
 /* register a driver */
 void
-rte_eal_vdrv_register(struct rte_vdev_driver *driver)
+rte_vdev_register(struct rte_vdev_driver *driver)
 {
 	TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
-	rte_eal_driver_register(&driver->driver);
 }
 
 /* unregister a driver */
 void
-rte_eal_vdrv_unregister(struct rte_vdev_driver *driver)
+rte_vdev_unregister(struct rte_vdev_driver *driver)
 {
-	rte_eal_driver_unregister(&driver->driver);
 	TAILQ_REMOVE(&vdev_driver_list, driver, next);
 }
 
-int
-rte_eal_vdev_init(const char *name, const char *args)
+/*
+ * Parse "driver" devargs without adding a dependency on rte_kvargs.h
+ */
+static char *parse_driver_arg(const char *args)
+{
+	const char *c;
+	char *str;
+
+	if (!args || args[0] == '\0')
+		return NULL;
+
+	c = args;
+
+	do {
+		if (strncmp(c, "driver=", 7) == 0) {
+			c += 7;
+			break;
+		}
+
+		c = strchr(c, ',');
+		if (c)
+			c++;
+	} while (c);
+
+	if (c)
+		str = strdup(c);
+	else
+		str = NULL;
+
+	return str;
+}
+
+static int
+vdev_parse(const char *name, void *addr)
 {
+	struct rte_vdev_driver **out = addr;
+	struct rte_vdev_driver *driver = NULL;
+
+	TAILQ_FOREACH(driver, &vdev_driver_list, next) {
+		if (strncmp(driver->driver.name, name,
+			    strlen(driver->driver.name)) == 0)
+			break;
+		if (driver->driver.alias &&
+		    strncmp(driver->driver.alias, name,
+			    strlen(driver->driver.alias)) == 0)
+			break;
+	}
+	if (driver != NULL &&
+	    addr != NULL)
+		*out = driver;
+	return driver == NULL;
+}
+
+static int
+vdev_probe_all_drivers(struct rte_vdev_device *dev)
+{
+	const char *name;
+	char *drv_name;
 	struct rte_vdev_driver *driver;
+	int ret = 1;
+
+	drv_name = parse_driver_arg(rte_vdev_device_args(dev));
+	name = drv_name ? drv_name : rte_vdev_device_name(dev);
+
+	RTE_LOG(DEBUG, EAL, "Search driver %s to probe device %s\n", name,
+		rte_vdev_device_name(dev));
+
+	if (vdev_parse(name, &driver)) {
+		ret = -1;
+		goto out;
+	}
+	dev->device.driver = &driver->driver;
+	ret = driver->probe(dev);
+	if (ret)
+		dev->device.driver = NULL;
+out:
+	free(drv_name);
+	return ret;
+}
+
+static struct rte_vdev_device *
+find_vdev(const char *name)
+{
+	struct rte_vdev_device *dev;
+
+	if (!name)
+		return NULL;
+
+	TAILQ_FOREACH(dev, &vdev_device_list, next) {
+		const char *devname = rte_vdev_device_name(dev);
+		if (!strncmp(devname, name, strlen(name)))
+			return dev;
+	}
+
+	return NULL;
+}
+
+static struct rte_devargs *
+alloc_devargs(const char *name, const char *args)
+{
+	struct rte_devargs *devargs;
+	int ret;
+
+	devargs = calloc(1, sizeof(*devargs));
+	if (!devargs)
+		return NULL;
+
+	devargs->type = RTE_DEVTYPE_VIRTUAL;
+	devargs->bus = rte_bus_find_by_name("vdev");
+	if (args)
+		devargs->args = strdup(args);
+
+	ret = snprintf(devargs->name, sizeof(devargs->name), "%s", name);
+	if (ret < 0 || ret >= (int)sizeof(devargs->name)) {
+		free(devargs->args);
+		free(devargs);
+		return NULL;
+	}
+
+	return devargs;
+}
+
+int
+rte_vdev_init(const char *name, const char *args)
+{
+	struct rte_vdev_device *dev;
+	struct rte_devargs *devargs;
+	int ret;
 
 	if (name == NULL)
 		return -EINVAL;
 
-	TAILQ_FOREACH(driver, &vdev_driver_list, next) {
-		/*
-		 * search a driver prefix in virtual device name.
-		 * For example, if the driver is pcap PMD, driver->name
-		 * will be "net_pcap", but "name" will be "net_pcapN".
-		 * So use strncmp to compare.
-		 */
-		if (!strncmp(driver->driver.name, name,
-			    strlen(driver->driver.name)))
-			return driver->probe(name, args);
+	dev = find_vdev(name);
+	if (dev)
+		return -EEXIST;
+
+	devargs = alloc_devargs(name, args);
+	if (!devargs)
+		return -ENOMEM;
+
+	dev = calloc(1, sizeof(*dev));
+	if (!dev) {
+		ret = -ENOMEM;
+		goto fail;
 	}
 
-	/* Give new names precedence over aliases. */
-	TAILQ_FOREACH(driver, &vdev_driver_list, next) {
-		if (driver->driver.alias &&
-		    !strncmp(driver->driver.alias, name,
-			    strlen(driver->driver.alias)))
-			return driver->probe(name, args);
+	dev->device.devargs = devargs;
+	dev->device.numa_node = SOCKET_ID_ANY;
+	dev->device.name = devargs->name;
+
+	ret = vdev_probe_all_drivers(dev);
+	if (ret) {
+		if (ret > 0)
+			RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
+		goto fail;
+	}
+
+	TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
+
+	TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
+	return 0;
+
+fail:
+	free(devargs->args);
+	free(devargs);
+	free(dev);
+	return ret;
+}
+
+static int
+vdev_remove_driver(struct rte_vdev_device *dev)
+{
+	const char *name = rte_vdev_device_name(dev);
+	const struct rte_vdev_driver *driver;
+
+	if (!dev->device.driver) {
+		RTE_LOG(DEBUG, EAL, "no driver attach to device %s\n", name);
+		return 1;
 	}
 
-	RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
-	return -EINVAL;
+	driver = container_of(dev->device.driver, const struct rte_vdev_driver,
+		driver);
+	return driver->remove(dev);
 }
 
 int
-rte_eal_vdev_uninit(const char *name)
+rte_vdev_uninit(const char *name)
 {
-	struct rte_vdev_driver *driver;
+	struct rte_vdev_device *dev;
+	struct rte_devargs *devargs;
+	int ret;
 
 	if (name == NULL)
 		return -EINVAL;
 
-	TAILQ_FOREACH(driver, &vdev_driver_list, next) {
-		/*
-		 * search a driver prefix in virtual device name.
-		 * For example, if the driver is pcap PMD, driver->name
-		 * will be "net_pcap", but "name" will be "net_pcapN".
-		 * So use strncmp to compare.
-		 */
-		if (!strncmp(driver->driver.name, name,
-			     strlen(driver->driver.name)))
-			return driver->remove(name);
+	dev = find_vdev(name);
+	if (!dev)
+		return -ENOENT;
+
+	devargs = dev->device.devargs;
+
+	ret = vdev_remove_driver(dev);
+	if (ret)
+		return ret;
+
+	TAILQ_REMOVE(&vdev_device_list, dev, next);
+
+	TAILQ_REMOVE(&devargs_list, devargs, next);
+
+	free(devargs->args);
+	free(devargs);
+	free(dev);
+	return 0;
+}
+
+static int
+vdev_scan(void)
+{
+	struct rte_vdev_device *dev;
+	struct rte_devargs *devargs;
+	struct rte_bus *vbus;
+
+	/* for virtual devices we scan the devargs_list populated via cmdline */
+	vbus = rte_bus_find_by_name("vdev");
+	TAILQ_FOREACH(devargs, &devargs_list, next) {
+
+		if (devargs->bus != vbus)
+			continue;
+
+		dev = find_vdev(devargs->name);
+		if (dev)
+			continue;
+
+		dev = calloc(1, sizeof(*dev));
+		if (!dev)
+			return -1;
+
+		dev->device.devargs = devargs;
+		dev->device.numa_node = SOCKET_ID_ANY;
+		dev->device.name = devargs->name;
+
+		TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
 	}
 
-	/* Give new names precedence over aliases. */
-	TAILQ_FOREACH(driver, &vdev_driver_list, next) {
-		if (driver->driver.alias &&
-		    !strncmp(driver->driver.alias, name,
-			    strlen(driver->driver.alias)))
-			return driver->remove(name);
+	return 0;
+}
+
+static int
+vdev_probe(void)
+{
+	struct rte_vdev_device *dev;
+
+	/* call the init function for each virtual device */
+	TAILQ_FOREACH(dev, &vdev_device_list, next) {
+
+		if (dev->device.driver)
+			continue;
+
+		if (vdev_probe_all_drivers(dev)) {
+			RTE_LOG(ERR, EAL, "failed to initialize %s device\n",
+				rte_vdev_device_name(dev));
+			return -1;
+		}
 	}
 
-	RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
-	return -EINVAL;
+	return 0;
+}
+
+static struct rte_device *
+vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
+		 const void *data)
+{
+	struct rte_vdev_device *dev;
+
+	TAILQ_FOREACH(dev, &vdev_device_list, next) {
+		if (start && &dev->device == start) {
+			start = NULL;
+			continue;
+		}
+		if (cmp(&dev->device, data) == 0)
+			return &dev->device;
+	}
+	return NULL;
 }
+
+static int
+vdev_unplug(struct rte_device *dev)
+{
+	/*
+	 * The virtual bus doesn't support 'unattached' devices so this is
+	 * actually equal to hotplugging removal of it.
+	 */
+	return rte_vdev_uninit(dev->name);
+}
+
+static struct rte_bus rte_vdev_bus = {
+	.scan = vdev_scan,
+	.probe = vdev_probe,
+	.find_device = vdev_find_device,
+	/* .plug = NULL, see comment on vdev_unplug */
+	.unplug = vdev_unplug,
+	.parse = vdev_parse,
+};
+
+RTE_REGISTER_BUS(vdev, rte_vdev_bus);