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 ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
76 return ret ? ret : count;
79 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
82 del_port_store(struct device *dev, struct device_attribute *attr,
83 const char *buf, size_t count)
85 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
86 unsigned int port_index;
89 /* Prevent to use nsim_bus_dev before initialization. */
90 if (!smp_load_acquire(&nsim_bus_dev->init))
92 ret = kstrtouint(buf, 0, &port_index);
96 ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
97 return ret ? ret : count;
100 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
102 static struct attribute *nsim_bus_dev_attrs[] = {
103 &nsim_bus_dev_numvfs_attr.attr,
104 &nsim_bus_dev_new_port_attr.attr,
105 &nsim_bus_dev_del_port_attr.attr,
109 static const struct attribute_group nsim_bus_dev_attr_group = {
110 .attrs = nsim_bus_dev_attrs,
113 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
114 &nsim_bus_dev_attr_group,
118 static void nsim_bus_dev_release(struct device *dev)
122 static struct device_type nsim_bus_dev_type = {
123 .groups = nsim_bus_dev_attr_groups,
124 .release = nsim_bus_dev_release,
127 static struct nsim_bus_dev *
128 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
131 new_device_store(struct bus_type *bus, const char *buf, size_t count)
133 unsigned int id, port_count, num_queues;
134 struct nsim_bus_dev *nsim_bus_dev;
137 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
147 pr_err("Value of \"id\" is too big.\n");
152 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
156 mutex_lock(&nsim_bus_dev_list_lock);
157 /* Prevent to use resource before initialization. */
158 if (!smp_load_acquire(&nsim_bus_enable)) {
163 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
164 if (IS_ERR(nsim_bus_dev)) {
165 err = PTR_ERR(nsim_bus_dev);
169 /* Allow using nsim_bus_dev */
170 smp_store_release(&nsim_bus_dev->init, true);
172 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
173 mutex_unlock(&nsim_bus_dev_list_lock);
177 mutex_unlock(&nsim_bus_dev_list_lock);
180 static BUS_ATTR_WO(new_device);
182 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
185 del_device_store(struct bus_type *bus, const char *buf, size_t count)
187 struct nsim_bus_dev *nsim_bus_dev, *tmp;
191 err = sscanf(buf, "%u", &id);
195 pr_err("Value of \"id\" is too big.\n");
200 pr_err("Format for deleting device is \"id\" (uint).\n");
205 mutex_lock(&nsim_bus_dev_list_lock);
206 /* Prevent to use resource before initialization. */
207 if (!smp_load_acquire(&nsim_bus_enable)) {
208 mutex_unlock(&nsim_bus_dev_list_lock);
211 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
212 if (nsim_bus_dev->dev.id != id)
214 list_del(&nsim_bus_dev->list);
215 nsim_bus_dev_del(nsim_bus_dev);
219 mutex_unlock(&nsim_bus_dev_list_lock);
220 return !err ? count : err;
222 static BUS_ATTR_WO(del_device);
224 static struct attribute *nsim_bus_attrs[] = {
225 &bus_attr_new_device.attr,
226 &bus_attr_del_device.attr,
229 ATTRIBUTE_GROUPS(nsim_bus);
231 static int nsim_bus_probe(struct device *dev)
233 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
235 return nsim_drv_probe(nsim_bus_dev);
238 static void nsim_bus_remove(struct device *dev)
240 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
242 nsim_drv_remove(nsim_bus_dev);
245 static int nsim_num_vf(struct device *dev)
247 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
249 return nsim_bus_dev->num_vfs;
252 static struct bus_type nsim_bus = {
254 .dev_name = DRV_NAME,
255 .bus_groups = nsim_bus_groups,
256 .probe = nsim_bus_probe,
257 .remove = nsim_bus_remove,
258 .num_vf = nsim_num_vf,
261 #define NSIM_BUS_DEV_MAX_VFS 4
263 static struct nsim_bus_dev *
264 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
266 struct nsim_bus_dev *nsim_bus_dev;
269 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
271 return ERR_PTR(-ENOMEM);
273 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
275 goto err_nsim_bus_dev_free;
276 nsim_bus_dev->dev.id = err;
277 nsim_bus_dev->dev.bus = &nsim_bus;
278 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
279 nsim_bus_dev->port_count = port_count;
280 nsim_bus_dev->num_queues = num_queues;
281 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
282 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
283 /* Disallow using nsim_bus_dev */
284 smp_store_release(&nsim_bus_dev->init, false);
286 err = device_register(&nsim_bus_dev->dev);
288 goto err_nsim_bus_dev_id_free;
292 err_nsim_bus_dev_id_free:
293 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
294 err_nsim_bus_dev_free:
299 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
301 /* Disallow using nsim_bus_dev */
302 smp_store_release(&nsim_bus_dev->init, false);
303 device_unregister(&nsim_bus_dev->dev);
304 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
308 static struct device_driver nsim_driver = {
311 .owner = THIS_MODULE,
314 int nsim_bus_init(void)
318 err = bus_register(&nsim_bus);
321 err = driver_register(&nsim_driver);
323 goto err_bus_unregister;
324 /* Allow using resources */
325 smp_store_release(&nsim_bus_enable, true);
329 bus_unregister(&nsim_bus);
333 void nsim_bus_exit(void)
335 struct nsim_bus_dev *nsim_bus_dev, *tmp;
337 /* Disallow using resources */
338 smp_store_release(&nsim_bus_enable, false);
340 mutex_lock(&nsim_bus_dev_list_lock);
341 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
342 list_del(&nsim_bus_dev->list);
343 nsim_bus_dev_del(nsim_bus_dev);
345 mutex_unlock(&nsim_bus_dev_list_lock);
347 driver_unregister(&nsim_driver);
348 bus_unregister(&nsim_bus);