4 * Copyright(c) 2016 RehiveTech. All rights reserved.
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39 #include <sys/queue.h>
45 #include <rte_common.h>
46 #include <rte_devargs.h>
47 #include <rte_memory.h>
48 #include <rte_errno.h>
50 /** Double linked list of virtual device drivers. */
51 TAILQ_HEAD(vdev_device_list, rte_vdev_device);
53 static struct vdev_device_list vdev_device_list =
54 TAILQ_HEAD_INITIALIZER(vdev_device_list);
55 struct vdev_driver_list vdev_driver_list =
56 TAILQ_HEAD_INITIALIZER(vdev_driver_list);
58 /* register a driver */
60 rte_vdev_register(struct rte_vdev_driver *driver)
62 TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
65 /* unregister a driver */
67 rte_vdev_unregister(struct rte_vdev_driver *driver)
69 TAILQ_REMOVE(&vdev_driver_list, driver, next);
73 * Parse "driver" devargs without adding a dependency on rte_kvargs.h
75 static char *parse_driver_arg(const char *args)
80 if (!args || args[0] == '\0')
86 if (strncmp(c, "driver=", 7) == 0) {
105 vdev_parse(const char *name, void *addr)
107 struct rte_vdev_driver **out = addr;
108 struct rte_vdev_driver *driver = NULL;
110 TAILQ_FOREACH(driver, &vdev_driver_list, next) {
111 if (strncmp(driver->driver.name, name,
112 strlen(driver->driver.name)) == 0)
114 if (driver->driver.alias &&
115 strncmp(driver->driver.alias, name,
116 strlen(driver->driver.alias)) == 0)
119 if (driver != NULL &&
122 return driver == NULL;
126 vdev_probe_all_drivers(struct rte_vdev_device *dev)
130 struct rte_vdev_driver *driver;
133 drv_name = parse_driver_arg(rte_vdev_device_args(dev));
134 name = drv_name ? drv_name : rte_vdev_device_name(dev);
136 RTE_LOG(DEBUG, EAL, "Search driver %s to probe device %s\n", name,
137 rte_vdev_device_name(dev));
139 if (vdev_parse(name, &driver)) {
143 dev->device.driver = &driver->driver;
144 ret = driver->probe(dev);
146 dev->device.driver = NULL;
152 static struct rte_vdev_device *
153 find_vdev(const char *name)
155 struct rte_vdev_device *dev;
160 TAILQ_FOREACH(dev, &vdev_device_list, next) {
161 const char *devname = rte_vdev_device_name(dev);
162 if (!strncmp(devname, name, strlen(name)))
169 static struct rte_devargs *
170 alloc_devargs(const char *name, const char *args)
172 struct rte_devargs *devargs;
175 devargs = calloc(1, sizeof(*devargs));
179 devargs->type = RTE_DEVTYPE_VIRTUAL;
180 devargs->bus = rte_bus_find_by_name("vdev");
182 devargs->args = strdup(args);
184 ret = snprintf(devargs->name, sizeof(devargs->name), "%s", name);
185 if (ret < 0 || ret >= (int)sizeof(devargs->name)) {
195 rte_vdev_init(const char *name, const char *args)
197 struct rte_vdev_device *dev;
198 struct rte_devargs *devargs;
204 dev = find_vdev(name);
208 devargs = alloc_devargs(name, args);
212 dev = calloc(1, sizeof(*dev));
218 dev->device.devargs = devargs;
219 dev->device.numa_node = SOCKET_ID_ANY;
220 dev->device.name = devargs->name;
222 ret = vdev_probe_all_drivers(dev);
225 RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
229 TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
231 TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
242 vdev_remove_driver(struct rte_vdev_device *dev)
244 const char *name = rte_vdev_device_name(dev);
245 const struct rte_vdev_driver *driver;
247 if (!dev->device.driver) {
248 RTE_LOG(DEBUG, EAL, "no driver attach to device %s\n", name);
252 driver = container_of(dev->device.driver, const struct rte_vdev_driver,
254 return driver->remove(dev);
258 rte_vdev_uninit(const char *name)
260 struct rte_vdev_device *dev;
261 struct rte_devargs *devargs;
267 dev = find_vdev(name);
271 devargs = dev->device.devargs;
273 ret = vdev_remove_driver(dev);
277 TAILQ_REMOVE(&vdev_device_list, dev, next);
279 TAILQ_REMOVE(&devargs_list, devargs, next);
290 struct rte_vdev_device *dev;
291 struct rte_devargs *devargs;
292 struct rte_bus *vbus;
294 /* for virtual devices we scan the devargs_list populated via cmdline */
295 vbus = rte_bus_find_by_name("vdev");
296 TAILQ_FOREACH(devargs, &devargs_list, next) {
298 if (devargs->bus != vbus)
301 dev = find_vdev(devargs->name);
305 dev = calloc(1, sizeof(*dev));
309 dev->device.devargs = devargs;
310 dev->device.numa_node = SOCKET_ID_ANY;
311 dev->device.name = devargs->name;
313 TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
322 struct rte_vdev_device *dev;
324 /* call the init function for each virtual device */
325 TAILQ_FOREACH(dev, &vdev_device_list, next) {
327 if (dev->device.driver)
330 if (vdev_probe_all_drivers(dev)) {
331 RTE_LOG(ERR, EAL, "failed to initialize %s device\n",
332 rte_vdev_device_name(dev));
340 static struct rte_device *
341 vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
344 struct rte_vdev_device *dev;
346 TAILQ_FOREACH(dev, &vdev_device_list, next) {
347 if (start && &dev->device == start) {
351 if (cmp(&dev->device, data) == 0)
358 vdev_unplug(struct rte_device *dev)
361 * The virtual bus doesn't support 'unattached' devices so this is
362 * actually equal to hotplugging removal of it.
364 return rte_vdev_uninit(dev->name);
367 static struct rte_bus rte_vdev_bus = {
370 .find_device = vdev_find_device,
371 /* .plug = NULL, see comment on vdev_unplug */
372 .unplug = vdev_unplug,
376 RTE_REGISTER_BUS(vdev, rte_vdev_bus);