1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2017 Netronome Systems, Inc.
3 * Copyright (C) 2019 Mellanox Technologies. All rights reserved
6 #include <linux/device.h>
8 #include <linux/kernel.h>
9 #include <linux/list.h>
10 #include <linux/mutex.h>
11 #include <linux/rtnetlink.h>
12 #include <linux/slab.h>
13 #include <linux/sysfs.h>
15 #include "netdevsim.h"
17 static DEFINE_IDA(nsim_bus_dev_ids);
18 static LIST_HEAD(nsim_bus_dev_list);
19 static DEFINE_MUTEX(nsim_bus_dev_list_lock);
20 static bool nsim_bus_enable;
22 static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
24 return container_of(dev, struct nsim_bus_dev, dev);
27 static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
30 struct nsim_dev *nsim_dev;
33 if (nsim_bus_dev->max_vfs < num_vfs)
36 if (!nsim_bus_dev->vfconfigs)
38 nsim_bus_dev->num_vfs = num_vfs;
40 nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
41 if (nsim_esw_mode_is_switchdev(nsim_dev)) {
42 err = nsim_esw_switchdev_enable(nsim_dev, NULL);
44 nsim_bus_dev->num_vfs = 0;
50 void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
52 struct nsim_dev *nsim_dev;
54 nsim_bus_dev->num_vfs = 0;
55 nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
56 if (nsim_esw_mode_is_switchdev(nsim_dev))
57 nsim_esw_legacy_enable(nsim_dev, NULL);
61 nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
62 const char *buf, size_t count)
64 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
68 ret = kstrtouint(buf, 0, &num_vfs);
72 mutex_lock(&nsim_bus_dev->vfs_lock);
73 if (nsim_bus_dev->num_vfs == num_vfs)
75 if (nsim_bus_dev->num_vfs && num_vfs) {
81 ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
85 nsim_bus_dev_vfs_disable(nsim_bus_dev);
90 mutex_unlock(&nsim_bus_dev->vfs_lock);
96 nsim_bus_dev_numvfs_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
99 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
101 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
104 static struct device_attribute nsim_bus_dev_numvfs_attr =
105 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
106 nsim_bus_dev_numvfs_store);
108 ssize_t nsim_bus_dev_max_vfs_read(struct file *file,
110 size_t count, loff_t *ppos)
112 struct nsim_bus_dev *nsim_bus_dev = file->private_data;
116 len = snprintf(buf, sizeof(buf), "%u\n", nsim_bus_dev->max_vfs);
120 return simple_read_from_buffer(data, count, ppos, buf, len);
123 ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
124 const char __user *data,
125 size_t count, loff_t *ppos)
127 struct nsim_bus_dev *nsim_bus_dev = file->private_data;
128 struct nsim_vf_config *vfconfigs;
136 if (count >= sizeof(buf))
139 mutex_lock(&nsim_bus_dev->vfs_lock);
140 /* Reject if VFs are configured */
141 if (nsim_bus_dev->num_vfs) {
146 ret = copy_from_user(buf, data, count);
153 ret = kstrtouint(buf, 10, &val);
159 /* max_vfs limited by the maximum number of provided port indexes */
160 if (val > NSIM_DEV_VF_PORT_INDEX_MAX - NSIM_DEV_VF_PORT_INDEX_BASE) {
165 vfconfigs = kcalloc(val, sizeof(struct nsim_vf_config), GFP_KERNEL | __GFP_NOWARN);
171 kfree(nsim_bus_dev->vfconfigs);
172 nsim_bus_dev->vfconfigs = vfconfigs;
173 nsim_bus_dev->max_vfs = val;
177 mutex_unlock(&nsim_bus_dev->vfs_lock);
182 new_port_store(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
185 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
186 unsigned int port_index;
189 /* Prevent to use nsim_bus_dev before initialization. */
190 if (!smp_load_acquire(&nsim_bus_dev->init))
192 ret = kstrtouint(buf, 0, &port_index);
196 if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
199 if (nsim_bus_dev->in_reload) {
200 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
204 ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
205 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
206 return ret ? ret : count;
209 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
212 del_port_store(struct device *dev, struct device_attribute *attr,
213 const char *buf, size_t count)
215 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
216 unsigned int port_index;
219 /* Prevent to use nsim_bus_dev before initialization. */
220 if (!smp_load_acquire(&nsim_bus_dev->init))
222 ret = kstrtouint(buf, 0, &port_index);
226 if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
229 if (nsim_bus_dev->in_reload) {
230 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
234 ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
235 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
236 return ret ? ret : count;
239 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
241 static struct attribute *nsim_bus_dev_attrs[] = {
242 &nsim_bus_dev_numvfs_attr.attr,
243 &nsim_bus_dev_new_port_attr.attr,
244 &nsim_bus_dev_del_port_attr.attr,
248 static const struct attribute_group nsim_bus_dev_attr_group = {
249 .attrs = nsim_bus_dev_attrs,
252 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
253 &nsim_bus_dev_attr_group,
257 static void nsim_bus_dev_release(struct device *dev)
261 static struct device_type nsim_bus_dev_type = {
262 .groups = nsim_bus_dev_attr_groups,
263 .release = nsim_bus_dev_release,
266 static struct nsim_bus_dev *
267 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
270 new_device_store(struct bus_type *bus, const char *buf, size_t count)
272 unsigned int id, port_count, num_queues;
273 struct nsim_bus_dev *nsim_bus_dev;
276 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
286 pr_err("Value of \"id\" is too big.\n");
291 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
295 mutex_lock(&nsim_bus_dev_list_lock);
296 /* Prevent to use resource before initialization. */
297 if (!smp_load_acquire(&nsim_bus_enable)) {
302 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
303 if (IS_ERR(nsim_bus_dev)) {
304 err = PTR_ERR(nsim_bus_dev);
308 /* Allow using nsim_bus_dev */
309 smp_store_release(&nsim_bus_dev->init, true);
311 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
312 mutex_unlock(&nsim_bus_dev_list_lock);
316 mutex_unlock(&nsim_bus_dev_list_lock);
319 static BUS_ATTR_WO(new_device);
321 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
324 del_device_store(struct bus_type *bus, const char *buf, size_t count)
326 struct nsim_bus_dev *nsim_bus_dev, *tmp;
330 err = sscanf(buf, "%u", &id);
334 pr_err("Value of \"id\" is too big.\n");
339 pr_err("Format for deleting device is \"id\" (uint).\n");
344 mutex_lock(&nsim_bus_dev_list_lock);
345 /* Prevent to use resource before initialization. */
346 if (!smp_load_acquire(&nsim_bus_enable)) {
347 mutex_unlock(&nsim_bus_dev_list_lock);
350 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
351 if (nsim_bus_dev->dev.id != id)
353 list_del(&nsim_bus_dev->list);
354 nsim_bus_dev_del(nsim_bus_dev);
358 mutex_unlock(&nsim_bus_dev_list_lock);
359 return !err ? count : err;
361 static BUS_ATTR_WO(del_device);
363 static struct attribute *nsim_bus_attrs[] = {
364 &bus_attr_new_device.attr,
365 &bus_attr_del_device.attr,
368 ATTRIBUTE_GROUPS(nsim_bus);
370 static int nsim_bus_probe(struct device *dev)
372 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
374 return nsim_dev_probe(nsim_bus_dev);
377 static void nsim_bus_remove(struct device *dev)
379 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
381 nsim_dev_remove(nsim_bus_dev);
384 static int nsim_num_vf(struct device *dev)
386 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
388 return nsim_bus_dev->num_vfs;
391 static struct bus_type nsim_bus = {
393 .dev_name = DRV_NAME,
394 .bus_groups = nsim_bus_groups,
395 .probe = nsim_bus_probe,
396 .remove = nsim_bus_remove,
397 .num_vf = nsim_num_vf,
400 #define NSIM_BUS_DEV_MAX_VFS 4
402 static struct nsim_bus_dev *
403 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
405 struct nsim_bus_dev *nsim_bus_dev;
408 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
410 return ERR_PTR(-ENOMEM);
412 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
414 goto err_nsim_bus_dev_free;
415 nsim_bus_dev->dev.id = err;
416 nsim_bus_dev->dev.bus = &nsim_bus;
417 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
418 nsim_bus_dev->port_count = port_count;
419 nsim_bus_dev->num_queues = num_queues;
420 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
421 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
422 mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
423 mutex_init(&nsim_bus_dev->vfs_lock);
424 /* Disallow using nsim_bus_dev */
425 smp_store_release(&nsim_bus_dev->init, false);
427 nsim_bus_dev->vfconfigs = kcalloc(nsim_bus_dev->max_vfs,
428 sizeof(struct nsim_vf_config),
429 GFP_KERNEL | __GFP_NOWARN);
430 if (!nsim_bus_dev->vfconfigs) {
432 goto err_nsim_bus_dev_id_free;
435 err = device_register(&nsim_bus_dev->dev);
437 goto err_nsim_vfs_free;
442 kfree(nsim_bus_dev->vfconfigs);
443 err_nsim_bus_dev_id_free:
444 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
445 err_nsim_bus_dev_free:
450 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
452 /* Disallow using nsim_bus_dev */
453 smp_store_release(&nsim_bus_dev->init, false);
454 device_unregister(&nsim_bus_dev->dev);
455 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
456 kfree(nsim_bus_dev->vfconfigs);
460 static struct device_driver nsim_driver = {
463 .owner = THIS_MODULE,
466 int nsim_bus_init(void)
470 err = bus_register(&nsim_bus);
473 err = driver_register(&nsim_driver);
475 goto err_bus_unregister;
476 /* Allow using resources */
477 smp_store_release(&nsim_bus_enable, true);
481 bus_unregister(&nsim_bus);
485 void nsim_bus_exit(void)
487 struct nsim_bus_dev *nsim_bus_dev, *tmp;
489 /* Disallow using resources */
490 smp_store_release(&nsim_bus_enable, false);
492 mutex_lock(&nsim_bus_dev_list_lock);
493 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
494 list_del(&nsim_bus_dev->list);
495 nsim_bus_dev_del(nsim_bus_dev);
497 mutex_unlock(&nsim_bus_dev_list_lock);
499 driver_unregister(&nsim_driver);
500 bus_unregister(&nsim_bus);