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 nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
31 sizeof(struct nsim_vf_config),
32 GFP_KERNEL | __GFP_NOWARN);
33 if (!nsim_bus_dev->vfconfigs)
35 nsim_bus_dev->num_vfs = num_vfs;
40 static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
42 kfree(nsim_bus_dev->vfconfigs);
43 nsim_bus_dev->vfconfigs = NULL;
44 nsim_bus_dev->num_vfs = 0;
48 nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
49 const char *buf, size_t count)
51 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
55 ret = kstrtouint(buf, 0, &num_vfs);
60 if (nsim_bus_dev->num_vfs == num_vfs)
62 if (nsim_bus_dev->num_vfs && num_vfs) {
68 ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
72 nsim_bus_dev_vfs_disable(nsim_bus_dev);
83 nsim_bus_dev_numvfs_show(struct device *dev,
84 struct device_attribute *attr, char *buf)
86 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
88 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
91 static struct device_attribute nsim_bus_dev_numvfs_attr =
92 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
93 nsim_bus_dev_numvfs_store);
96 new_port_store(struct device *dev, struct device_attribute *attr,
97 const char *buf, size_t count)
99 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
100 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
101 struct devlink *devlink;
102 unsigned int port_index;
105 /* Prevent to use nsim_bus_dev before initialization. */
106 if (!smp_load_acquire(&nsim_bus_dev->init))
108 ret = kstrtouint(buf, 0, &port_index);
112 devlink = priv_to_devlink(nsim_dev);
114 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
115 devlink_reload_disable(devlink);
116 ret = nsim_dev_port_add(nsim_bus_dev, port_index);
117 devlink_reload_enable(devlink);
118 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
119 return ret ? ret : count;
122 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
125 del_port_store(struct device *dev, struct device_attribute *attr,
126 const char *buf, size_t count)
128 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
129 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
130 struct devlink *devlink;
131 unsigned int port_index;
134 /* Prevent to use nsim_bus_dev before initialization. */
135 if (!smp_load_acquire(&nsim_bus_dev->init))
137 ret = kstrtouint(buf, 0, &port_index);
141 devlink = priv_to_devlink(nsim_dev);
143 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
144 devlink_reload_disable(devlink);
145 ret = nsim_dev_port_del(nsim_bus_dev, port_index);
146 devlink_reload_enable(devlink);
147 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
148 return ret ? ret : count;
151 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
153 static struct attribute *nsim_bus_dev_attrs[] = {
154 &nsim_bus_dev_numvfs_attr.attr,
155 &nsim_bus_dev_new_port_attr.attr,
156 &nsim_bus_dev_del_port_attr.attr,
160 static const struct attribute_group nsim_bus_dev_attr_group = {
161 .attrs = nsim_bus_dev_attrs,
164 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
165 &nsim_bus_dev_attr_group,
169 static void nsim_bus_dev_release(struct device *dev)
171 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
173 nsim_bus_dev_vfs_disable(nsim_bus_dev);
176 static struct device_type nsim_bus_dev_type = {
177 .groups = nsim_bus_dev_attr_groups,
178 .release = nsim_bus_dev_release,
181 static struct nsim_bus_dev *
182 nsim_bus_dev_new(unsigned int id, unsigned int port_count);
185 new_device_store(struct bus_type *bus, const char *buf, size_t count)
187 struct nsim_bus_dev *nsim_bus_dev;
188 unsigned int port_count;
192 err = sscanf(buf, "%u %u", &id, &port_count);
199 pr_err("Value of \"id\" is too big.\n");
204 pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
208 mutex_lock(&nsim_bus_dev_list_lock);
209 /* Prevent to use resource before initialization. */
210 if (!smp_load_acquire(&nsim_bus_enable)) {
215 nsim_bus_dev = nsim_bus_dev_new(id, port_count);
216 if (IS_ERR(nsim_bus_dev)) {
217 err = PTR_ERR(nsim_bus_dev);
221 /* Allow using nsim_bus_dev */
222 smp_store_release(&nsim_bus_dev->init, true);
224 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
225 mutex_unlock(&nsim_bus_dev_list_lock);
229 mutex_unlock(&nsim_bus_dev_list_lock);
232 static BUS_ATTR_WO(new_device);
234 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
237 del_device_store(struct bus_type *bus, const char *buf, size_t count)
239 struct nsim_bus_dev *nsim_bus_dev, *tmp;
243 err = sscanf(buf, "%u", &id);
247 pr_err("Value of \"id\" is too big.\n");
252 pr_err("Format for deleting device is \"id\" (uint).\n");
257 mutex_lock(&nsim_bus_dev_list_lock);
258 /* Prevent to use resource before initialization. */
259 if (!smp_load_acquire(&nsim_bus_enable)) {
260 mutex_unlock(&nsim_bus_dev_list_lock);
263 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
264 if (nsim_bus_dev->dev.id != id)
266 list_del(&nsim_bus_dev->list);
267 nsim_bus_dev_del(nsim_bus_dev);
271 mutex_unlock(&nsim_bus_dev_list_lock);
272 return !err ? count : err;
274 static BUS_ATTR_WO(del_device);
276 static struct attribute *nsim_bus_attrs[] = {
277 &bus_attr_new_device.attr,
278 &bus_attr_del_device.attr,
281 ATTRIBUTE_GROUPS(nsim_bus);
283 static int nsim_bus_probe(struct device *dev)
285 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
287 return nsim_dev_probe(nsim_bus_dev);
290 static int nsim_bus_remove(struct device *dev)
292 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
294 nsim_dev_remove(nsim_bus_dev);
298 static int nsim_num_vf(struct device *dev)
300 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
302 return nsim_bus_dev->num_vfs;
305 static struct bus_type nsim_bus = {
307 .dev_name = DRV_NAME,
308 .bus_groups = nsim_bus_groups,
309 .probe = nsim_bus_probe,
310 .remove = nsim_bus_remove,
311 .num_vf = nsim_num_vf,
314 static struct nsim_bus_dev *
315 nsim_bus_dev_new(unsigned int id, unsigned int port_count)
317 struct nsim_bus_dev *nsim_bus_dev;
320 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
322 return ERR_PTR(-ENOMEM);
324 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
326 goto err_nsim_bus_dev_free;
327 nsim_bus_dev->dev.id = err;
328 nsim_bus_dev->dev.bus = &nsim_bus;
329 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
330 nsim_bus_dev->port_count = port_count;
331 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
332 mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
333 /* Disallow using nsim_bus_dev */
334 smp_store_release(&nsim_bus_dev->init, false);
336 err = device_register(&nsim_bus_dev->dev);
338 goto err_nsim_bus_dev_id_free;
341 err_nsim_bus_dev_id_free:
342 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
343 err_nsim_bus_dev_free:
348 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
350 /* Disallow using nsim_bus_dev */
351 smp_store_release(&nsim_bus_dev->init, false);
352 device_unregister(&nsim_bus_dev->dev);
353 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
357 static struct device_driver nsim_driver = {
360 .owner = THIS_MODULE,
363 int nsim_bus_init(void)
367 err = bus_register(&nsim_bus);
370 err = driver_register(&nsim_driver);
372 goto err_bus_unregister;
373 /* Allow using resources */
374 smp_store_release(&nsim_bus_enable, true);
378 bus_unregister(&nsim_bus);
382 void nsim_bus_exit(void)
384 struct nsim_bus_dev *nsim_bus_dev, *tmp;
386 /* Disallow using resources */
387 smp_store_release(&nsim_bus_enable, false);
389 mutex_lock(&nsim_bus_dev_list_lock);
390 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
391 list_del(&nsim_bus_dev->list);
392 nsim_bus_dev_del(nsim_bus_dev);
394 mutex_unlock(&nsim_bus_dev_list_lock);
396 driver_unregister(&nsim_driver);
397 bus_unregister(&nsim_bus);