1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2016 RehiveTech. All rights reserved.
11 #include <sys/queue.h>
16 #include <rte_common.h>
17 #include <rte_devargs.h>
18 #include <rte_memory.h>
19 #include <rte_tailq.h>
20 #include <rte_spinlock.h>
21 #include <rte_string_fns.h>
22 #include <rte_errno.h>
24 #include "rte_bus_vdev.h"
25 #include "vdev_logs.h"
26 #include "vdev_private.h"
28 #define VDEV_MP_KEY "bus_vdev_mp"
32 /* Forward declare to access virtual bus name */
33 static struct rte_bus rte_vdev_bus;
35 /** Double linked list of virtual device drivers. */
36 TAILQ_HEAD(vdev_device_list, rte_vdev_device);
38 static struct vdev_device_list vdev_device_list =
39 TAILQ_HEAD_INITIALIZER(vdev_device_list);
40 /* The lock needs to be recursive because a vdev can manage another vdev. */
41 static rte_spinlock_recursive_t vdev_device_list_lock =
42 RTE_SPINLOCK_RECURSIVE_INITIALIZER;
44 struct vdev_driver_list vdev_driver_list =
45 TAILQ_HEAD_INITIALIZER(vdev_driver_list);
47 struct vdev_custom_scan {
48 TAILQ_ENTRY(vdev_custom_scan) next;
49 rte_vdev_scan_callback callback;
52 TAILQ_HEAD(vdev_custom_scans, vdev_custom_scan);
53 static struct vdev_custom_scans vdev_custom_scans =
54 TAILQ_HEAD_INITIALIZER(vdev_custom_scans);
55 static rte_spinlock_t vdev_custom_scan_lock = RTE_SPINLOCK_INITIALIZER;
57 /* register a driver */
59 rte_vdev_register(struct rte_vdev_driver *driver)
61 TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
64 /* unregister a driver */
66 rte_vdev_unregister(struct rte_vdev_driver *driver)
68 TAILQ_REMOVE(&vdev_driver_list, driver, next);
72 rte_vdev_add_custom_scan(rte_vdev_scan_callback callback, void *user_arg)
74 struct vdev_custom_scan *custom_scan;
76 rte_spinlock_lock(&vdev_custom_scan_lock);
78 /* check if already registered */
79 TAILQ_FOREACH(custom_scan, &vdev_custom_scans, next) {
80 if (custom_scan->callback == callback &&
81 custom_scan->user_arg == user_arg)
85 if (custom_scan == NULL) {
86 custom_scan = malloc(sizeof(struct vdev_custom_scan));
87 if (custom_scan != NULL) {
88 custom_scan->callback = callback;
89 custom_scan->user_arg = user_arg;
90 TAILQ_INSERT_TAIL(&vdev_custom_scans, custom_scan, next);
94 rte_spinlock_unlock(&vdev_custom_scan_lock);
96 return (custom_scan == NULL) ? -1 : 0;
100 rte_vdev_remove_custom_scan(rte_vdev_scan_callback callback, void *user_arg)
102 struct vdev_custom_scan *custom_scan, *tmp_scan;
104 rte_spinlock_lock(&vdev_custom_scan_lock);
105 TAILQ_FOREACH_SAFE(custom_scan, &vdev_custom_scans, next, tmp_scan) {
106 if (custom_scan->callback != callback ||
107 (custom_scan->user_arg != (void *)-1 &&
108 custom_scan->user_arg != user_arg))
110 TAILQ_REMOVE(&vdev_custom_scans, custom_scan, next);
113 rte_spinlock_unlock(&vdev_custom_scan_lock);
119 vdev_parse(const char *name, void *addr)
121 struct rte_vdev_driver **out = addr;
122 struct rte_vdev_driver *driver = NULL;
124 TAILQ_FOREACH(driver, &vdev_driver_list, next) {
125 if (strncmp(driver->driver.name, name,
126 strlen(driver->driver.name)) == 0)
128 if (driver->driver.alias &&
129 strncmp(driver->driver.alias, name,
130 strlen(driver->driver.alias)) == 0)
133 if (driver != NULL &&
136 return driver == NULL;
140 vdev_probe_all_drivers(struct rte_vdev_device *dev)
143 struct rte_vdev_driver *driver;
146 name = rte_vdev_device_name(dev);
148 VDEV_LOG(DEBUG, "Search driver %s to probe device %s", name,
149 rte_vdev_device_name(dev));
151 if (vdev_parse(name, &driver))
153 dev->device.driver = &driver->driver;
154 ret = driver->probe(dev);
156 dev->device.driver = NULL;
160 /* The caller shall be responsible for thread-safe */
161 static struct rte_vdev_device *
162 find_vdev(const char *name)
164 struct rte_vdev_device *dev;
169 TAILQ_FOREACH(dev, &vdev_device_list, next) {
170 const char *devname = rte_vdev_device_name(dev);
172 if (!strcmp(devname, name))
179 static struct rte_devargs *
180 alloc_devargs(const char *name, const char *args)
182 struct rte_devargs *devargs;
185 devargs = calloc(1, sizeof(*devargs));
189 devargs->bus = &rte_vdev_bus;
191 devargs->args = strdup(args);
193 devargs->args = strdup("");
195 ret = snprintf(devargs->name, sizeof(devargs->name), "%s", name);
196 if (ret < 0 || ret >= (int)sizeof(devargs->name)) {
206 insert_vdev(const char *name, const char *args, struct rte_vdev_device **p_dev)
208 struct rte_vdev_device *dev;
209 struct rte_devargs *devargs;
215 devargs = alloc_devargs(name, args);
219 dev = calloc(1, sizeof(*dev));
225 dev->device.devargs = devargs;
226 dev->device.numa_node = SOCKET_ID_ANY;
227 dev->device.name = devargs->name;
229 if (find_vdev(name)) {
234 TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
235 rte_devargs_insert(devargs);
249 rte_vdev_init(const char *name, const char *args)
251 struct rte_vdev_device *dev;
254 rte_spinlock_recursive_lock(&vdev_device_list_lock);
255 ret = insert_vdev(name, args, &dev);
257 ret = vdev_probe_all_drivers(dev);
260 VDEV_LOG(ERR, "no driver found for %s", name);
261 /* If fails, remove it from vdev list */
262 TAILQ_REMOVE(&vdev_device_list, dev, next);
263 rte_devargs_remove(dev->device.devargs);
267 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
272 vdev_remove_driver(struct rte_vdev_device *dev)
274 const char *name = rte_vdev_device_name(dev);
275 const struct rte_vdev_driver *driver;
277 if (!dev->device.driver) {
278 VDEV_LOG(DEBUG, "no driver attach to device %s", name);
282 driver = container_of(dev->device.driver, const struct rte_vdev_driver,
284 return driver->remove(dev);
288 rte_vdev_uninit(const char *name)
290 struct rte_vdev_device *dev;
296 rte_spinlock_recursive_lock(&vdev_device_list_lock);
298 dev = find_vdev(name);
304 ret = vdev_remove_driver(dev);
308 TAILQ_REMOVE(&vdev_device_list, dev, next);
309 rte_devargs_remove(dev->device.devargs);
313 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
318 #define VDEV_SCAN_REQ 1
319 #define VDEV_SCAN_ONE 2
320 #define VDEV_SCAN_REP 3
323 char name[RTE_DEV_NAME_MAX_LEN];
326 static int vdev_plug(struct rte_device *dev);
329 * This function works as the action for both primary and secondary process
330 * for static vdev discovery when a secondary process is booting.
332 * step 1, secondary process sends a sync request to ask for vdev in primary;
333 * step 2, primary process receives the request, and send vdevs one by one;
334 * step 3, primary process sends back reply, which indicates how many vdevs
338 vdev_action(const struct rte_mp_msg *mp_msg, const void *peer)
340 struct rte_vdev_device *dev;
341 struct rte_mp_msg mp_resp;
342 struct vdev_param *ou = (struct vdev_param *)&mp_resp.param;
343 const struct vdev_param *in = (const struct vdev_param *)mp_msg->param;
348 strlcpy(mp_resp.name, VDEV_MP_KEY, sizeof(mp_resp.name));
349 mp_resp.len_param = sizeof(*ou);
354 ou->type = VDEV_SCAN_ONE;
358 rte_spinlock_recursive_lock(&vdev_device_list_lock);
359 TAILQ_FOREACH(dev, &vdev_device_list, next) {
360 devname = rte_vdev_device_name(dev);
361 if (strlen(devname) == 0) {
362 VDEV_LOG(INFO, "vdev with no name is not sent");
365 VDEV_LOG(INFO, "send vdev, %s", devname);
366 strlcpy(ou->name, devname, RTE_DEV_NAME_MAX_LEN);
367 if (rte_mp_sendmsg(&mp_resp) < 0)
368 VDEV_LOG(ERR, "send vdev, %s, failed, %s",
369 devname, strerror(rte_errno));
372 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
374 ou->type = VDEV_SCAN_REP;
376 if (rte_mp_reply(&mp_resp, peer) < 0)
377 VDEV_LOG(ERR, "Failed to reply a scan request");
380 VDEV_LOG(INFO, "receive vdev, %s", in->name);
381 ret = insert_vdev(in->name, NULL, NULL);
383 VDEV_LOG(DEBUG, "device already exist, %s", in->name);
385 VDEV_LOG(ERR, "failed to add vdev, %s", in->name);
388 VDEV_LOG(ERR, "vdev cannot recognize this message");
397 struct rte_vdev_device *dev;
398 struct rte_devargs *devargs;
399 struct vdev_custom_scan *custom_scan;
401 if (rte_mp_action_register(VDEV_MP_KEY, vdev_action) < 0 &&
402 rte_errno != EEXIST) {
403 VDEV_LOG(ERR, "Failed to add vdev mp action");
407 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
408 struct rte_mp_msg mp_req, *mp_rep;
409 struct rte_mp_reply mp_reply;
410 struct timespec ts = {.tv_sec = 5, .tv_nsec = 0};
411 struct vdev_param *req = (struct vdev_param *)mp_req.param;
412 struct vdev_param *resp;
414 strlcpy(mp_req.name, VDEV_MP_KEY, sizeof(mp_req.name));
415 mp_req.len_param = sizeof(*req);
417 req->type = VDEV_SCAN_REQ;
418 if (rte_mp_request_sync(&mp_req, &mp_reply, &ts) == 0 &&
419 mp_reply.nb_received == 1) {
420 mp_rep = &mp_reply.msgs[0];
421 resp = (struct vdev_param *)mp_rep->param;
422 VDEV_LOG(INFO, "Received %d vdevs", resp->num);
424 VDEV_LOG(ERR, "Failed to request vdev from primary");
426 /* Fall through to allow private vdevs in secondary process */
429 /* call custom scan callbacks if any */
430 rte_spinlock_lock(&vdev_custom_scan_lock);
431 TAILQ_FOREACH(custom_scan, &vdev_custom_scans, next) {
432 if (custom_scan->callback != NULL)
434 * the callback should update devargs list
435 * by calling rte_devargs_insert() with
436 * devargs.bus = rte_bus_find_by_name("vdev");
437 * devargs.type = RTE_DEVTYPE_VIRTUAL;
438 * devargs.policy = RTE_DEV_WHITELISTED;
440 custom_scan->callback(custom_scan->user_arg);
442 rte_spinlock_unlock(&vdev_custom_scan_lock);
444 /* for virtual devices we scan the devargs_list populated via cmdline */
445 RTE_EAL_DEVARGS_FOREACH("vdev", devargs) {
447 dev = calloc(1, sizeof(*dev));
451 rte_spinlock_recursive_lock(&vdev_device_list_lock);
453 if (find_vdev(devargs->name)) {
454 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
459 dev->device.bus = &rte_vdev_bus;
460 dev->device.devargs = devargs;
461 dev->device.numa_node = SOCKET_ID_ANY;
462 dev->device.name = devargs->name;
464 TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
466 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
475 struct rte_vdev_device *dev;
478 /* call the init function for each virtual device */
479 TAILQ_FOREACH(dev, &vdev_device_list, next) {
480 /* we don't use the vdev lock here, as it's only used in DPDK
481 * initialization; and we don't want to hold such a lock when
482 * we call each driver probe.
485 if (dev->device.driver)
488 if (vdev_probe_all_drivers(dev)) {
489 VDEV_LOG(ERR, "failed to initialize %s device",
490 rte_vdev_device_name(dev));
499 rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
502 const struct rte_vdev_device *vstart;
503 struct rte_vdev_device *dev;
505 rte_spinlock_recursive_lock(&vdev_device_list_lock);
507 vstart = RTE_DEV_TO_VDEV_CONST(start);
508 dev = TAILQ_NEXT(vstart, next);
510 dev = TAILQ_FIRST(&vdev_device_list);
512 while (dev != NULL) {
513 if (cmp(&dev->device, data) == 0)
515 dev = TAILQ_NEXT(dev, next);
517 rte_spinlock_recursive_unlock(&vdev_device_list_lock);
519 return dev ? &dev->device : NULL;
523 vdev_plug(struct rte_device *dev)
525 return vdev_probe_all_drivers(RTE_DEV_TO_VDEV(dev));
529 vdev_unplug(struct rte_device *dev)
531 return rte_vdev_uninit(dev->name);
534 static struct rte_bus rte_vdev_bus = {
537 .find_device = rte_vdev_find_device,
539 .unplug = vdev_unplug,
541 .dev_iterate = rte_vdev_dev_iterate,
544 RTE_REGISTER_BUS(vdev, rte_vdev_bus);
546 RTE_INIT(vdev_init_log)
548 vdev_logtype_bus = rte_log_register("bus.vdev");
549 if (vdev_logtype_bus >= 0)
550 rte_log_set_level(vdev_logtype_bus, RTE_LOG_NOTICE);