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/slab.h>
12 #include <linux/sysfs.h>
14 #include "netdevsim.h"
16 static DEFINE_IDA(nsim_bus_dev_ids);
17 static LIST_HEAD(nsim_bus_dev_list);
18 static DEFINE_MUTEX(nsim_bus_dev_list_lock);
19 static bool nsim_bus_enable;
21 static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
23 return container_of(dev, struct nsim_bus_dev, dev);
27 nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
28 const char *buf, size_t count)
30 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
34 ret = kstrtouint(buf, 0, &num_vfs);
40 if (dev_get_drvdata(dev))
41 ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
44 return ret ? ret : count;
48 nsim_bus_dev_numvfs_show(struct device *dev,
49 struct device_attribute *attr, char *buf)
51 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
53 return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
56 static struct device_attribute nsim_bus_dev_numvfs_attr =
57 __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
58 nsim_bus_dev_numvfs_store);
61 new_port_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);
65 unsigned int port_index;
68 /* Prevent to use nsim_bus_dev before initialization. */
69 if (!smp_load_acquire(&nsim_bus_dev->init))
71 ret = kstrtouint(buf, 0, &port_index);
75 if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
78 if (nsim_bus_dev->in_reload) {
79 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
83 ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
84 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
85 return ret ? ret : count;
88 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
91 del_port_store(struct device *dev, struct device_attribute *attr,
92 const char *buf, size_t count)
94 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
95 unsigned int port_index;
98 /* Prevent to use nsim_bus_dev before initialization. */
99 if (!smp_load_acquire(&nsim_bus_dev->init))
101 ret = kstrtouint(buf, 0, &port_index);
105 if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
108 if (nsim_bus_dev->in_reload) {
109 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
113 ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
114 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
115 return ret ? ret : count;
118 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
120 static struct attribute *nsim_bus_dev_attrs[] = {
121 &nsim_bus_dev_numvfs_attr.attr,
122 &nsim_bus_dev_new_port_attr.attr,
123 &nsim_bus_dev_del_port_attr.attr,
127 static const struct attribute_group nsim_bus_dev_attr_group = {
128 .attrs = nsim_bus_dev_attrs,
131 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
132 &nsim_bus_dev_attr_group,
136 static void nsim_bus_dev_release(struct device *dev)
140 static struct device_type nsim_bus_dev_type = {
141 .groups = nsim_bus_dev_attr_groups,
142 .release = nsim_bus_dev_release,
145 static struct nsim_bus_dev *
146 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
149 new_device_store(struct bus_type *bus, const char *buf, size_t count)
151 unsigned int id, port_count, num_queues;
152 struct nsim_bus_dev *nsim_bus_dev;
155 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
165 pr_err("Value of \"id\" is too big.\n");
170 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
174 mutex_lock(&nsim_bus_dev_list_lock);
175 /* Prevent to use resource before initialization. */
176 if (!smp_load_acquire(&nsim_bus_enable)) {
181 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
182 if (IS_ERR(nsim_bus_dev)) {
183 err = PTR_ERR(nsim_bus_dev);
187 /* Allow using nsim_bus_dev */
188 smp_store_release(&nsim_bus_dev->init, true);
190 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
191 mutex_unlock(&nsim_bus_dev_list_lock);
195 mutex_unlock(&nsim_bus_dev_list_lock);
198 static BUS_ATTR_WO(new_device);
200 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
203 del_device_store(struct bus_type *bus, const char *buf, size_t count)
205 struct nsim_bus_dev *nsim_bus_dev, *tmp;
209 err = sscanf(buf, "%u", &id);
213 pr_err("Value of \"id\" is too big.\n");
218 pr_err("Format for deleting device is \"id\" (uint).\n");
223 mutex_lock(&nsim_bus_dev_list_lock);
224 /* Prevent to use resource before initialization. */
225 if (!smp_load_acquire(&nsim_bus_enable)) {
226 mutex_unlock(&nsim_bus_dev_list_lock);
229 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
230 if (nsim_bus_dev->dev.id != id)
232 list_del(&nsim_bus_dev->list);
233 nsim_bus_dev_del(nsim_bus_dev);
237 mutex_unlock(&nsim_bus_dev_list_lock);
238 return !err ? count : err;
240 static BUS_ATTR_WO(del_device);
242 static struct attribute *nsim_bus_attrs[] = {
243 &bus_attr_new_device.attr,
244 &bus_attr_del_device.attr,
247 ATTRIBUTE_GROUPS(nsim_bus);
249 static int nsim_bus_probe(struct device *dev)
251 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
253 return nsim_drv_probe(nsim_bus_dev);
256 static void nsim_bus_remove(struct device *dev)
258 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
260 nsim_drv_remove(nsim_bus_dev);
263 static int nsim_num_vf(struct device *dev)
265 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
267 return nsim_bus_dev->num_vfs;
270 static struct bus_type nsim_bus = {
272 .dev_name = DRV_NAME,
273 .bus_groups = nsim_bus_groups,
274 .probe = nsim_bus_probe,
275 .remove = nsim_bus_remove,
276 .num_vf = nsim_num_vf,
279 #define NSIM_BUS_DEV_MAX_VFS 4
281 static struct nsim_bus_dev *
282 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
284 struct nsim_bus_dev *nsim_bus_dev;
287 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
289 return ERR_PTR(-ENOMEM);
291 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
293 goto err_nsim_bus_dev_free;
294 nsim_bus_dev->dev.id = err;
295 nsim_bus_dev->dev.bus = &nsim_bus;
296 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
297 nsim_bus_dev->port_count = port_count;
298 nsim_bus_dev->num_queues = num_queues;
299 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
300 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
301 mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
302 /* Disallow using nsim_bus_dev */
303 smp_store_release(&nsim_bus_dev->init, false);
305 err = device_register(&nsim_bus_dev->dev);
307 goto err_nsim_bus_dev_id_free;
311 err_nsim_bus_dev_id_free:
312 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
313 err_nsim_bus_dev_free:
318 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
320 /* Disallow using nsim_bus_dev */
321 smp_store_release(&nsim_bus_dev->init, false);
322 device_unregister(&nsim_bus_dev->dev);
323 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
327 static struct device_driver nsim_driver = {
330 .owner = THIS_MODULE,
333 int nsim_bus_init(void)
337 err = bus_register(&nsim_bus);
340 err = driver_register(&nsim_driver);
342 goto err_bus_unregister;
343 /* Allow using resources */
344 smp_store_release(&nsim_bus_enable, true);
348 bus_unregister(&nsim_bus);
352 void nsim_bus_exit(void)
354 struct nsim_bus_dev *nsim_bus_dev, *tmp;
356 /* Disallow using resources */
357 smp_store_release(&nsim_bus_enable, false);
359 mutex_lock(&nsim_bus_dev_list_lock);
360 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
361 list_del(&nsim_bus_dev->list);
362 nsim_bus_dev_del(nsim_bus_dev);
364 mutex_unlock(&nsim_bus_dev_list_lock);
366 driver_unregister(&nsim_driver);
367 bus_unregister(&nsim_bus);