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)
120 struct nsim_bus_dev *nsim_bus_dev;
122 nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
126 static struct device_type nsim_bus_dev_type = {
127 .groups = nsim_bus_dev_attr_groups,
128 .release = nsim_bus_dev_release,
131 static struct nsim_bus_dev *
132 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
135 new_device_store(struct bus_type *bus, const char *buf, size_t count)
137 unsigned int id, port_count, num_queues;
138 struct nsim_bus_dev *nsim_bus_dev;
141 err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
151 pr_err("Value of \"id\" is too big.\n");
156 pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
160 mutex_lock(&nsim_bus_dev_list_lock);
161 /* Prevent to use resource before initialization. */
162 if (!smp_load_acquire(&nsim_bus_enable)) {
167 nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
168 if (IS_ERR(nsim_bus_dev)) {
169 err = PTR_ERR(nsim_bus_dev);
173 /* Allow using nsim_bus_dev */
174 smp_store_release(&nsim_bus_dev->init, true);
176 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
177 mutex_unlock(&nsim_bus_dev_list_lock);
181 mutex_unlock(&nsim_bus_dev_list_lock);
184 static BUS_ATTR_WO(new_device);
186 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
189 del_device_store(struct bus_type *bus, const char *buf, size_t count)
191 struct nsim_bus_dev *nsim_bus_dev, *tmp;
195 err = sscanf(buf, "%u", &id);
199 pr_err("Value of \"id\" is too big.\n");
204 pr_err("Format for deleting device is \"id\" (uint).\n");
209 mutex_lock(&nsim_bus_dev_list_lock);
210 /* Prevent to use resource before initialization. */
211 if (!smp_load_acquire(&nsim_bus_enable)) {
212 mutex_unlock(&nsim_bus_dev_list_lock);
215 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
216 if (nsim_bus_dev->dev.id != id)
218 list_del(&nsim_bus_dev->list);
219 nsim_bus_dev_del(nsim_bus_dev);
223 mutex_unlock(&nsim_bus_dev_list_lock);
224 return !err ? count : err;
226 static BUS_ATTR_WO(del_device);
228 static struct attribute *nsim_bus_attrs[] = {
229 &bus_attr_new_device.attr,
230 &bus_attr_del_device.attr,
233 ATTRIBUTE_GROUPS(nsim_bus);
235 static int nsim_bus_probe(struct device *dev)
237 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
239 return nsim_drv_probe(nsim_bus_dev);
242 static void nsim_bus_remove(struct device *dev)
244 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
246 nsim_drv_remove(nsim_bus_dev);
249 static int nsim_num_vf(struct device *dev)
251 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
253 return nsim_bus_dev->num_vfs;
256 static struct bus_type nsim_bus = {
258 .dev_name = DRV_NAME,
259 .bus_groups = nsim_bus_groups,
260 .probe = nsim_bus_probe,
261 .remove = nsim_bus_remove,
262 .num_vf = nsim_num_vf,
265 #define NSIM_BUS_DEV_MAX_VFS 4
267 static struct nsim_bus_dev *
268 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
270 struct nsim_bus_dev *nsim_bus_dev;
273 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
275 return ERR_PTR(-ENOMEM);
277 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
279 goto err_nsim_bus_dev_free;
280 nsim_bus_dev->dev.id = err;
281 nsim_bus_dev->dev.bus = &nsim_bus;
282 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
283 nsim_bus_dev->port_count = port_count;
284 nsim_bus_dev->num_queues = num_queues;
285 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
286 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
287 /* Disallow using nsim_bus_dev */
288 smp_store_release(&nsim_bus_dev->init, false);
290 err = device_register(&nsim_bus_dev->dev);
292 goto err_nsim_bus_dev_id_free;
296 err_nsim_bus_dev_id_free:
297 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
298 put_device(&nsim_bus_dev->dev);
300 err_nsim_bus_dev_free:
305 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
307 /* Disallow using nsim_bus_dev */
308 smp_store_release(&nsim_bus_dev->init, false);
309 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
310 device_unregister(&nsim_bus_dev->dev);
313 static struct device_driver nsim_driver = {
316 .owner = THIS_MODULE,
319 int nsim_bus_init(void)
323 err = bus_register(&nsim_bus);
326 err = driver_register(&nsim_driver);
328 goto err_bus_unregister;
329 /* Allow using resources */
330 smp_store_release(&nsim_bus_enable, true);
334 bus_unregister(&nsim_bus);
338 void nsim_bus_exit(void)
340 struct nsim_bus_dev *nsim_bus_dev, *tmp;
342 /* Disallow using resources */
343 smp_store_release(&nsim_bus_enable, false);
345 mutex_lock(&nsim_bus_dev_list_lock);
346 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
347 list_del(&nsim_bus_dev->list);
348 nsim_bus_dev_del(nsim_bus_dev);
350 mutex_unlock(&nsim_bus_dev_list_lock);
352 driver_unregister(&nsim_driver);
353 bus_unregister(&nsim_bus);