linux/drivers/net/netdevsim/bus.c

342 lines
7.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2017 Netronome Systems, Inc.
* Copyright (C) 2019 Mellanox Technologies. All rights reserved
*/
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include "netdevsim.h"
static DEFINE_IDA(nsim_bus_dev_ids);
static LIST_HEAD(nsim_bus_dev_list);
static DEFINE_MUTEX(nsim_bus_dev_list_lock);
static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
{
return container_of(dev, struct nsim_bus_dev, dev);
}
static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
unsigned int num_vfs)
{
nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
sizeof(struct nsim_vf_config),
GFP_KERNEL);
if (!nsim_bus_dev->vfconfigs)
return -ENOMEM;
nsim_bus_dev->num_vfs = num_vfs;
return 0;
}
static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
{
kfree(nsim_bus_dev->vfconfigs);
nsim_bus_dev->vfconfigs = NULL;
nsim_bus_dev->num_vfs = 0;
}
static ssize_t
nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
unsigned int num_vfs;
int ret;
ret = kstrtouint(buf, 0, &num_vfs);
if (ret)
return ret;
rtnl_lock();
if (nsim_bus_dev->num_vfs == num_vfs)
goto exit_good;
if (nsim_bus_dev->num_vfs && num_vfs) {
ret = -EBUSY;
goto exit_unlock;
}
if (num_vfs) {
ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
if (ret)
goto exit_unlock;
} else {
nsim_bus_dev_vfs_disable(nsim_bus_dev);
}
exit_good:
ret = count;
exit_unlock:
rtnl_unlock();
return ret;
}
static ssize_t
nsim_bus_dev_numvfs_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
}
static struct device_attribute nsim_bus_dev_numvfs_attr =
__ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
nsim_bus_dev_numvfs_store);
static ssize_t
new_port_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
unsigned int port_index;
int ret;
ret = kstrtouint(buf, 0, &port_index);
if (ret)
return ret;
ret = nsim_dev_port_add(nsim_bus_dev, port_index);
return ret ? ret : count;
}
static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
static ssize_t
del_port_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
unsigned int port_index;
int ret;
ret = kstrtouint(buf, 0, &port_index);
if (ret)
return ret;
ret = nsim_dev_port_del(nsim_bus_dev, port_index);
return ret ? ret : count;
}
static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
static struct attribute *nsim_bus_dev_attrs[] = {
&nsim_bus_dev_numvfs_attr.attr,
&nsim_bus_dev_new_port_attr.attr,
&nsim_bus_dev_del_port_attr.attr,
NULL,
};
static const struct attribute_group nsim_bus_dev_attr_group = {
.attrs = nsim_bus_dev_attrs,
};
static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
&nsim_bus_dev_attr_group,
NULL,
};
static void nsim_bus_dev_release(struct device *dev)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
nsim_bus_dev_vfs_disable(nsim_bus_dev);
}
static struct device_type nsim_bus_dev_type = {
.groups = nsim_bus_dev_attr_groups,
.release = nsim_bus_dev_release,
};
static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count);
static ssize_t
new_device_store(struct bus_type *bus, const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev;
unsigned int port_count;
unsigned int id;
int err;
err = sscanf(buf, "%u %u", &id, &port_count);
switch (err) {
case 1:
port_count = 1;
/* fall through */
case 2:
if (id > INT_MAX) {
pr_err("Value of \"id\" is too big.\n");
return -EINVAL;
}
break;
default:
pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
return -EINVAL;
}
nsim_bus_dev = nsim_bus_dev_new(id, port_count);
if (IS_ERR(nsim_bus_dev))
return PTR_ERR(nsim_bus_dev);
mutex_lock(&nsim_bus_dev_list_lock);
list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
mutex_unlock(&nsim_bus_dev_list_lock);
return count;
}
static BUS_ATTR_WO(new_device);
static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
static ssize_t
del_device_store(struct bus_type *bus, const char *buf, size_t count)
{
struct nsim_bus_dev *nsim_bus_dev, *tmp;
unsigned int id;
int err;
err = sscanf(buf, "%u", &id);
switch (err) {
case 1:
if (id > INT_MAX) {
pr_err("Value of \"id\" is too big.\n");
return -EINVAL;
}
break;
default:
pr_err("Format for deleting device is \"id\" (uint).\n");
return -EINVAL;
}
err = -ENOENT;
mutex_lock(&nsim_bus_dev_list_lock);
list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
if (nsim_bus_dev->dev.id != id)
continue;
list_del(&nsim_bus_dev->list);
nsim_bus_dev_del(nsim_bus_dev);
err = 0;
break;
}
mutex_unlock(&nsim_bus_dev_list_lock);
return !err ? count : err;
}
static BUS_ATTR_WO(del_device);
static struct attribute *nsim_bus_attrs[] = {
&bus_attr_new_device.attr,
&bus_attr_del_device.attr,
NULL
};
ATTRIBUTE_GROUPS(nsim_bus);
static int nsim_bus_probe(struct device *dev)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
return nsim_dev_probe(nsim_bus_dev);
}
static int nsim_bus_remove(struct device *dev)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
nsim_dev_remove(nsim_bus_dev);
return 0;
}
static int nsim_num_vf(struct device *dev)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
return nsim_bus_dev->num_vfs;
}
static struct bus_type nsim_bus = {
.name = DRV_NAME,
.dev_name = DRV_NAME,
.bus_groups = nsim_bus_groups,
.probe = nsim_bus_probe,
.remove = nsim_bus_remove,
.num_vf = nsim_num_vf,
};
static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count)
{
struct nsim_bus_dev *nsim_bus_dev;
int err;
nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
if (!nsim_bus_dev)
return ERR_PTR(-ENOMEM);
err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
if (err < 0)
goto err_nsim_bus_dev_free;
nsim_bus_dev->dev.id = err;
nsim_bus_dev->dev.bus = &nsim_bus;
nsim_bus_dev->dev.type = &nsim_bus_dev_type;
nsim_bus_dev->port_count = port_count;
err = device_register(&nsim_bus_dev->dev);
if (err)
goto err_nsim_bus_dev_id_free;
return nsim_bus_dev;
err_nsim_bus_dev_id_free:
ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
err_nsim_bus_dev_free:
kfree(nsim_bus_dev);
return ERR_PTR(err);
}
static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
{
device_unregister(&nsim_bus_dev->dev);
ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
kfree(nsim_bus_dev);
}
static struct device_driver nsim_driver = {
.name = DRV_NAME,
.bus = &nsim_bus,
.owner = THIS_MODULE,
};
int nsim_bus_init(void)
{
int err;
err = bus_register(&nsim_bus);
if (err)
return err;
err = driver_register(&nsim_driver);
if (err)
goto err_bus_unregister;
return 0;
err_bus_unregister:
bus_unregister(&nsim_bus);
return err;
}
void nsim_bus_exit(void)
{
struct nsim_bus_dev *nsim_bus_dev, *tmp;
mutex_lock(&nsim_bus_dev_list_lock);
list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
list_del(&nsim_bus_dev->list);
nsim_bus_dev_del(nsim_bus_dev);
}
mutex_unlock(&nsim_bus_dev_list_lock);
driver_unregister(&nsim_driver);
bus_unregister(&nsim_bus);
}