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 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
187 struct devlink *devlink;
188 unsigned int port_index;
191 /* Prevent to use nsim_bus_dev before initialization. */
192 if (!smp_load_acquire(&nsim_bus_dev->init))
194 ret = kstrtouint(buf, 0, &port_index);
198 devlink = priv_to_devlink(nsim_dev);
200 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
201 devlink_reload_disable(devlink);
202 ret = nsim_dev_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
203 devlink_reload_enable(devlink);
204 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
205 return ret ? ret : count;
208 static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
211 del_port_store(struct device *dev, struct device_attribute *attr,
212 const char *buf, size_t count)
214 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
215 struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
216 struct devlink *devlink;
217 unsigned int port_index;
220 /* Prevent to use nsim_bus_dev before initialization. */
221 if (!smp_load_acquire(&nsim_bus_dev->init))
223 ret = kstrtouint(buf, 0, &port_index);
227 devlink = priv_to_devlink(nsim_dev);
229 mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
230 devlink_reload_disable(devlink);
231 ret = nsim_dev_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
232 devlink_reload_enable(devlink);
233 mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
234 return ret ? ret : count;
237 static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
239 static struct attribute *nsim_bus_dev_attrs[] = {
240 &nsim_bus_dev_numvfs_attr.attr,
241 &nsim_bus_dev_new_port_attr.attr,
242 &nsim_bus_dev_del_port_attr.attr,
246 static const struct attribute_group nsim_bus_dev_attr_group = {
247 .attrs = nsim_bus_dev_attrs,
250 static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
251 &nsim_bus_dev_attr_group,
255 static void nsim_bus_dev_release(struct device *dev)
259 static struct device_type nsim_bus_dev_type = {
260 .groups = nsim_bus_dev_attr_groups,
261 .release = nsim_bus_dev_release,
264 static struct nsim_bus_dev *
265 nsim_bus_dev_new(unsigned int id, unsigned int port_count);
268 new_device_store(struct bus_type *bus, const char *buf, size_t count)
270 struct nsim_bus_dev *nsim_bus_dev;
271 unsigned int port_count;
275 err = sscanf(buf, "%u %u", &id, &port_count);
282 pr_err("Value of \"id\" is too big.\n");
287 pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
291 mutex_lock(&nsim_bus_dev_list_lock);
292 /* Prevent to use resource before initialization. */
293 if (!smp_load_acquire(&nsim_bus_enable)) {
298 nsim_bus_dev = nsim_bus_dev_new(id, port_count);
299 if (IS_ERR(nsim_bus_dev)) {
300 err = PTR_ERR(nsim_bus_dev);
304 /* Allow using nsim_bus_dev */
305 smp_store_release(&nsim_bus_dev->init, true);
307 list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
308 mutex_unlock(&nsim_bus_dev_list_lock);
312 mutex_unlock(&nsim_bus_dev_list_lock);
315 static BUS_ATTR_WO(new_device);
317 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
320 del_device_store(struct bus_type *bus, const char *buf, size_t count)
322 struct nsim_bus_dev *nsim_bus_dev, *tmp;
326 err = sscanf(buf, "%u", &id);
330 pr_err("Value of \"id\" is too big.\n");
335 pr_err("Format for deleting device is \"id\" (uint).\n");
340 mutex_lock(&nsim_bus_dev_list_lock);
341 /* Prevent to use resource before initialization. */
342 if (!smp_load_acquire(&nsim_bus_enable)) {
343 mutex_unlock(&nsim_bus_dev_list_lock);
346 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
347 if (nsim_bus_dev->dev.id != id)
349 list_del(&nsim_bus_dev->list);
350 nsim_bus_dev_del(nsim_bus_dev);
354 mutex_unlock(&nsim_bus_dev_list_lock);
355 return !err ? count : err;
357 static BUS_ATTR_WO(del_device);
359 static struct attribute *nsim_bus_attrs[] = {
360 &bus_attr_new_device.attr,
361 &bus_attr_del_device.attr,
364 ATTRIBUTE_GROUPS(nsim_bus);
366 static int nsim_bus_probe(struct device *dev)
368 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
370 return nsim_dev_probe(nsim_bus_dev);
373 static void nsim_bus_remove(struct device *dev)
375 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
377 nsim_dev_remove(nsim_bus_dev);
380 static int nsim_num_vf(struct device *dev)
382 struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
384 return nsim_bus_dev->num_vfs;
387 static struct bus_type nsim_bus = {
389 .dev_name = DRV_NAME,
390 .bus_groups = nsim_bus_groups,
391 .probe = nsim_bus_probe,
392 .remove = nsim_bus_remove,
393 .num_vf = nsim_num_vf,
396 #define NSIM_BUS_DEV_MAX_VFS 4
398 static struct nsim_bus_dev *
399 nsim_bus_dev_new(unsigned int id, unsigned int port_count)
401 struct nsim_bus_dev *nsim_bus_dev;
404 nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
406 return ERR_PTR(-ENOMEM);
408 err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
410 goto err_nsim_bus_dev_free;
411 nsim_bus_dev->dev.id = err;
412 nsim_bus_dev->dev.bus = &nsim_bus;
413 nsim_bus_dev->dev.type = &nsim_bus_dev_type;
414 nsim_bus_dev->port_count = port_count;
415 nsim_bus_dev->initial_net = current->nsproxy->net_ns;
416 nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
417 mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
418 mutex_init(&nsim_bus_dev->vfs_lock);
419 /* Disallow using nsim_bus_dev */
420 smp_store_release(&nsim_bus_dev->init, false);
422 nsim_bus_dev->vfconfigs = kcalloc(nsim_bus_dev->max_vfs,
423 sizeof(struct nsim_vf_config),
424 GFP_KERNEL | __GFP_NOWARN);
425 if (!nsim_bus_dev->vfconfigs) {
427 goto err_nsim_bus_dev_id_free;
430 err = device_register(&nsim_bus_dev->dev);
432 goto err_nsim_vfs_free;
437 kfree(nsim_bus_dev->vfconfigs);
438 err_nsim_bus_dev_id_free:
439 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
440 err_nsim_bus_dev_free:
445 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
447 /* Disallow using nsim_bus_dev */
448 smp_store_release(&nsim_bus_dev->init, false);
449 device_unregister(&nsim_bus_dev->dev);
450 ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
451 kfree(nsim_bus_dev->vfconfigs);
455 static struct device_driver nsim_driver = {
458 .owner = THIS_MODULE,
461 int nsim_bus_init(void)
465 err = bus_register(&nsim_bus);
468 err = driver_register(&nsim_driver);
470 goto err_bus_unregister;
471 /* Allow using resources */
472 smp_store_release(&nsim_bus_enable, true);
476 bus_unregister(&nsim_bus);
480 void nsim_bus_exit(void)
482 struct nsim_bus_dev *nsim_bus_dev, *tmp;
484 /* Disallow using resources */
485 smp_store_release(&nsim_bus_enable, false);
487 mutex_lock(&nsim_bus_dev_list_lock);
488 list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
489 list_del(&nsim_bus_dev->list);
490 nsim_bus_dev_del(nsim_bus_dev);
492 mutex_unlock(&nsim_bus_dev_list_lock);
494 driver_unregister(&nsim_driver);
495 bus_unregister(&nsim_bus);