355 lines
8.3 KiB
C
355 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2017 Netronome Systems, Inc.
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* Copyright (C) 2019 Mellanox Technologies. All rights reserved
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*/
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include "netdevsim.h"
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static DEFINE_IDA(nsim_bus_dev_ids);
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static LIST_HEAD(nsim_bus_dev_list);
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static DEFINE_MUTEX(nsim_bus_dev_list_lock);
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static bool nsim_bus_enable;
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static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
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{
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return container_of(dev, struct nsim_bus_dev, dev);
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}
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static ssize_t
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nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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unsigned int num_vfs;
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int ret;
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ret = kstrtouint(buf, 0, &num_vfs);
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if (ret)
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return ret;
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device_lock(dev);
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ret = -ENOENT;
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if (dev_get_drvdata(dev))
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ret = nsim_drv_configure_vfs(nsim_bus_dev, num_vfs);
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device_unlock(dev);
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return ret ? ret : count;
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}
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static ssize_t
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nsim_bus_dev_numvfs_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
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}
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static struct device_attribute nsim_bus_dev_numvfs_attr =
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__ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
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nsim_bus_dev_numvfs_store);
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static ssize_t
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new_port_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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unsigned int port_index;
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int ret;
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/* Prevent to use nsim_bus_dev before initialization. */
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if (!smp_load_acquire(&nsim_bus_dev->init))
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return -EBUSY;
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ret = kstrtouint(buf, 0, &port_index);
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if (ret)
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return ret;
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ret = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
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return ret ? ret : count;
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}
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static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);
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static ssize_t
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del_port_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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unsigned int port_index;
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int ret;
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/* Prevent to use nsim_bus_dev before initialization. */
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if (!smp_load_acquire(&nsim_bus_dev->init))
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return -EBUSY;
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ret = kstrtouint(buf, 0, &port_index);
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if (ret)
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return ret;
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ret = nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_PF, port_index);
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return ret ? ret : count;
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}
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static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);
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static struct attribute *nsim_bus_dev_attrs[] = {
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&nsim_bus_dev_numvfs_attr.attr,
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&nsim_bus_dev_new_port_attr.attr,
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&nsim_bus_dev_del_port_attr.attr,
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NULL,
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};
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static const struct attribute_group nsim_bus_dev_attr_group = {
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.attrs = nsim_bus_dev_attrs,
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};
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static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
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&nsim_bus_dev_attr_group,
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NULL,
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};
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static void nsim_bus_dev_release(struct device *dev)
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{
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struct nsim_bus_dev *nsim_bus_dev;
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nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
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kfree(nsim_bus_dev);
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}
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static struct device_type nsim_bus_dev_type = {
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.groups = nsim_bus_dev_attr_groups,
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.release = nsim_bus_dev_release,
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};
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static struct nsim_bus_dev *
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nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
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static ssize_t
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new_device_store(struct bus_type *bus, const char *buf, size_t count)
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{
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unsigned int id, port_count, num_queues;
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struct nsim_bus_dev *nsim_bus_dev;
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int err;
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err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
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switch (err) {
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case 1:
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port_count = 1;
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fallthrough;
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case 2:
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num_queues = 1;
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fallthrough;
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case 3:
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if (id > INT_MAX) {
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pr_err("Value of \"id\" is too big.\n");
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return -EINVAL;
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}
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break;
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default:
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pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
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return -EINVAL;
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}
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mutex_lock(&nsim_bus_dev_list_lock);
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/* Prevent to use resource before initialization. */
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if (!smp_load_acquire(&nsim_bus_enable)) {
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err = -EBUSY;
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goto err;
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}
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nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
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if (IS_ERR(nsim_bus_dev)) {
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err = PTR_ERR(nsim_bus_dev);
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goto err;
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}
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/* Allow using nsim_bus_dev */
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smp_store_release(&nsim_bus_dev->init, true);
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list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
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mutex_unlock(&nsim_bus_dev_list_lock);
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return count;
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err:
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mutex_unlock(&nsim_bus_dev_list_lock);
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return err;
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}
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static BUS_ATTR_WO(new_device);
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static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
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static ssize_t
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del_device_store(struct bus_type *bus, const char *buf, size_t count)
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{
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struct nsim_bus_dev *nsim_bus_dev, *tmp;
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unsigned int id;
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int err;
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err = sscanf(buf, "%u", &id);
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switch (err) {
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case 1:
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if (id > INT_MAX) {
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pr_err("Value of \"id\" is too big.\n");
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return -EINVAL;
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}
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break;
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default:
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pr_err("Format for deleting device is \"id\" (uint).\n");
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return -EINVAL;
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}
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err = -ENOENT;
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mutex_lock(&nsim_bus_dev_list_lock);
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/* Prevent to use resource before initialization. */
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if (!smp_load_acquire(&nsim_bus_enable)) {
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mutex_unlock(&nsim_bus_dev_list_lock);
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return -EBUSY;
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}
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list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
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if (nsim_bus_dev->dev.id != id)
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continue;
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list_del(&nsim_bus_dev->list);
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nsim_bus_dev_del(nsim_bus_dev);
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err = 0;
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break;
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}
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mutex_unlock(&nsim_bus_dev_list_lock);
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return !err ? count : err;
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}
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static BUS_ATTR_WO(del_device);
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static struct attribute *nsim_bus_attrs[] = {
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&bus_attr_new_device.attr,
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&bus_attr_del_device.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(nsim_bus);
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static int nsim_bus_probe(struct device *dev)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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return nsim_drv_probe(nsim_bus_dev);
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}
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static void nsim_bus_remove(struct device *dev)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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nsim_drv_remove(nsim_bus_dev);
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}
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static int nsim_num_vf(struct device *dev)
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{
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struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
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return nsim_bus_dev->num_vfs;
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}
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static struct bus_type nsim_bus = {
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.name = DRV_NAME,
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.dev_name = DRV_NAME,
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.bus_groups = nsim_bus_groups,
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.probe = nsim_bus_probe,
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.remove = nsim_bus_remove,
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.num_vf = nsim_num_vf,
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};
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#define NSIM_BUS_DEV_MAX_VFS 4
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static struct nsim_bus_dev *
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nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
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{
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struct nsim_bus_dev *nsim_bus_dev;
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int err;
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nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
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if (!nsim_bus_dev)
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return ERR_PTR(-ENOMEM);
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err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
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if (err < 0)
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goto err_nsim_bus_dev_free;
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nsim_bus_dev->dev.id = err;
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nsim_bus_dev->dev.bus = &nsim_bus;
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nsim_bus_dev->dev.type = &nsim_bus_dev_type;
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nsim_bus_dev->port_count = port_count;
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nsim_bus_dev->num_queues = num_queues;
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nsim_bus_dev->initial_net = current->nsproxy->net_ns;
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nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
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/* Disallow using nsim_bus_dev */
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smp_store_release(&nsim_bus_dev->init, false);
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err = device_register(&nsim_bus_dev->dev);
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if (err)
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goto err_nsim_bus_dev_id_free;
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return nsim_bus_dev;
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err_nsim_bus_dev_id_free:
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ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
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put_device(&nsim_bus_dev->dev);
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nsim_bus_dev = NULL;
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err_nsim_bus_dev_free:
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kfree(nsim_bus_dev);
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return ERR_PTR(err);
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}
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static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
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{
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/* Disallow using nsim_bus_dev */
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smp_store_release(&nsim_bus_dev->init, false);
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ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
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device_unregister(&nsim_bus_dev->dev);
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}
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static struct device_driver nsim_driver = {
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.name = DRV_NAME,
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.bus = &nsim_bus,
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.owner = THIS_MODULE,
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};
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int nsim_bus_init(void)
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{
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int err;
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err = bus_register(&nsim_bus);
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if (err)
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return err;
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err = driver_register(&nsim_driver);
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if (err)
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goto err_bus_unregister;
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/* Allow using resources */
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smp_store_release(&nsim_bus_enable, true);
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return 0;
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err_bus_unregister:
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bus_unregister(&nsim_bus);
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return err;
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}
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void nsim_bus_exit(void)
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{
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struct nsim_bus_dev *nsim_bus_dev, *tmp;
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/* Disallow using resources */
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smp_store_release(&nsim_bus_enable, false);
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mutex_lock(&nsim_bus_dev_list_lock);
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list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
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list_del(&nsim_bus_dev->list);
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nsim_bus_dev_del(nsim_bus_dev);
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}
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mutex_unlock(&nsim_bus_dev_list_lock);
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driver_unregister(&nsim_driver);
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bus_unregister(&nsim_bus);
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}
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