blob: 64c0cdd31bf85468ce4fa2b2af5c8aff4cfba897 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2017 Netronome Systems, Inc.
* Copyright (C) 2019 Mellanox Technologies. All rights reserved
*/
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/refcount.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 bool nsim_bus_enable;
static refcount_t nsim_bus_devs; /* Including the bus itself. */
static DECLARE_COMPLETION(nsim_bus_devs_released);
static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
{
return container_of(dev, struct nsim_bus_dev, dev);
}
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;
device_lock(dev);
ret = -ENOENT;
if (dev_get_drvdata(dev))
ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
device_unlock(dev);
return ret ? ret : count;
}
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;
/* Prevent to use nsim_bus_dev before initialization. */
if (!smp_load_acquire(&nsim_bus_dev->init))
return -EBUSY;
ret = kstrtouint(buf, 0, &port_index);
if (ret)
return ret;
ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, 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;
/* Prevent to use nsim_bus_dev before initialization. */
if (!smp_load_acquire(&nsim_bus_dev->init))
return -EBUSY;
ret = kstrtouint(buf, 0, &port_index);
if (ret)
return ret;
ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, 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;
nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
kfree(nsim_bus_dev);
if (refcount_dec_and_test(&nsim_bus_devs))
complete(&nsim_bus_devs_released);
}
static const 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, unsigned int num_queues);
static ssize_t
new_device_store(const struct bus_type *bus, const char *buf, size_t count)
{
unsigned int id, port_count, num_queues;
struct nsim_bus_dev *nsim_bus_dev;
int err;
err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
switch (err) {
case 1:
port_count = 1;
fallthrough;
case 2:
num_queues = 1;
fallthrough;
case 3:
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 num_queues\" (uint uint unit).\n");
return -EINVAL;
}
mutex_lock(&nsim_bus_dev_list_lock);
/* Prevent to use resource before initialization. */
if (!smp_load_acquire(&nsim_bus_enable)) {
err = -EBUSY;
goto err;
}
nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
if (IS_ERR(nsim_bus_dev)) {
err = PTR_ERR(nsim_bus_dev);
goto err;
}
refcount_inc(&nsim_bus_devs);
/* Allow using nsim_bus_dev */
smp_store_release(&nsim_bus_dev->init, true);
list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
mutex_unlock(&nsim_bus_dev_list_lock);
return count;
err:
mutex_unlock(&nsim_bus_dev_list_lock);
return err;
}
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(const 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);
/* Prevent to use resource before initialization. */
if (!smp_load_acquire(&nsim_bus_enable)) {
mutex_unlock(&nsim_bus_dev_list_lock);
return -EBUSY;
}
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 ssize_t link_device_store(const struct bus_type *bus, const char *buf, size_t count)
{
struct netdevsim *nsim_a, *nsim_b, *peer;
struct net_device *dev_a, *dev_b;
unsigned int ifidx_a, ifidx_b;
int netnsfd_a, netnsfd_b, err;
struct net *ns_a, *ns_b;
err = sscanf(buf, "%d:%u %d:%u", &netnsfd_a, &ifidx_a, &netnsfd_b,
&ifidx_b);
if (err != 4) {
pr_err("Format for linking two devices is \"netnsfd_a:ifidx_a netnsfd_b:ifidx_b\" (int uint int uint).\n");
return -EINVAL;
}
ns_a = get_net_ns_by_fd(netnsfd_a);
if (IS_ERR(ns_a)) {
pr_err("Could not find netns with fd: %d\n", netnsfd_a);
return -EINVAL;
}
ns_b = get_net_ns_by_fd(netnsfd_b);
if (IS_ERR(ns_b)) {
pr_err("Could not find netns with fd: %d\n", netnsfd_b);
put_net(ns_a);
return -EINVAL;
}
err = -EINVAL;
rtnl_lock();
dev_a = __dev_get_by_index(ns_a, ifidx_a);
if (!dev_a) {
pr_err("Could not find device with ifindex %u in netnsfd %d\n",
ifidx_a, netnsfd_a);
goto out_err;
}
if (!netdev_is_nsim(dev_a)) {
pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
ifidx_a, netnsfd_a);
goto out_err;
}
dev_b = __dev_get_by_index(ns_b, ifidx_b);
if (!dev_b) {
pr_err("Could not find device with ifindex %u in netnsfd %d\n",
ifidx_b, netnsfd_b);
goto out_err;
}
if (!netdev_is_nsim(dev_b)) {
pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
ifidx_b, netnsfd_b);
goto out_err;
}
if (dev_a == dev_b) {
pr_err("Cannot link a netdevsim to itself\n");
goto out_err;
}
err = -EBUSY;
nsim_a = netdev_priv(dev_a);
peer = rtnl_dereference(nsim_a->peer);
if (peer) {
pr_err("Netdevsim %d:%u is already linked\n", netnsfd_a,
ifidx_a);
goto out_err;
}
nsim_b = netdev_priv(dev_b);
peer = rtnl_dereference(nsim_b->peer);
if (peer) {
pr_err("Netdevsim %d:%u is already linked\n", netnsfd_b,
ifidx_b);
goto out_err;
}
err = 0;
rcu_assign_pointer(nsim_a->peer, nsim_b);
rcu_assign_pointer(nsim_b->peer, nsim_a);
out_err:
put_net(ns_b);
put_net(ns_a);
rtnl_unlock();
return !err ? count : err;
}
static BUS_ATTR_WO(link_device);
static ssize_t unlink_device_store(const struct bus_type *bus, const char *buf, size_t count)
{
struct netdevsim *nsim, *peer;
struct net_device *dev;
unsigned int ifidx;
int netnsfd, err;
struct net *ns;
err = sscanf(buf, "%u:%u", &netnsfd, &ifidx);
if (err != 2) {
pr_err("Format for unlinking a device is \"netnsfd:ifidx\" (int uint).\n");
return -EINVAL;
}
ns = get_net_ns_by_fd(netnsfd);
if (IS_ERR(ns)) {
pr_err("Could not find netns with fd: %d\n", netnsfd);
return -EINVAL;
}
err = -EINVAL;
rtnl_lock();
dev = __dev_get_by_index(ns, ifidx);
if (!dev) {
pr_err("Could not find device with ifindex %u in netnsfd %d\n",
ifidx, netnsfd);
goto out_put_netns;
}
if (!netdev_is_nsim(dev)) {
pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
ifidx, netnsfd);
goto out_put_netns;
}
nsim = netdev_priv(dev);
peer = rtnl_dereference(nsim->peer);
if (!peer)
goto out_put_netns;
err = 0;
RCU_INIT_POINTER(nsim->peer, NULL);
RCU_INIT_POINTER(peer->peer, NULL);
out_put_netns:
put_net(ns);
rtnl_unlock();
return !err ? count : err;
}
static BUS_ATTR_WO(unlink_device);
static struct attribute *nsim_bus_attrs[] = {
&bus_attr_new_device.attr,
&bus_attr_del_device.attr,
&bus_attr_link_device.attr,
&bus_attr_unlink_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_drv_probe(nsim_bus_dev);
}
static void nsim_bus_remove(struct device *dev)
{
struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
nsim_drv_remove(nsim_bus_dev);
}
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 const 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,
};
#define NSIM_BUS_DEV_MAX_VFS 4
static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
{
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;
nsim_bus_dev->num_queues = num_queues;
nsim_bus_dev->initial_net = current->nsproxy->net_ns;
nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
/* Disallow using nsim_bus_dev */
smp_store_release(&nsim_bus_dev->init, false);
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);
put_device(&nsim_bus_dev->dev);
nsim_bus_dev = NULL;
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)
{
/* Disallow using nsim_bus_dev */
smp_store_release(&nsim_bus_dev->init, false);
ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
device_unregister(&nsim_bus_dev->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;
refcount_set(&nsim_bus_devs, 1);
/* Allow using resources */
smp_store_release(&nsim_bus_enable, true);
return 0;
err_bus_unregister:
bus_unregister(&nsim_bus);
return err;
}
void nsim_bus_exit(void)
{
struct nsim_bus_dev *nsim_bus_dev, *tmp;
/* Disallow using resources */
smp_store_release(&nsim_bus_enable, false);
if (refcount_dec_and_test(&nsim_bus_devs))
complete(&nsim_bus_devs_released);
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);
wait_for_completion(&nsim_bus_devs_released);
driver_unregister(&nsim_driver);
bus_unregister(&nsim_bus);
}