diff options
Diffstat (limited to 'drivers/infiniband/core/device.c')
| -rw-r--r-- | drivers/infiniband/core/device.c | 1261 |
1 files changed, 1261 insertions, 0 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c new file mode 100644 index 000000000..ffd0f43e2 --- /dev/null +++ b/drivers/infiniband/core/device.c @@ -0,0 +1,1261 @@ +/* + * Copyright (c) 2004 Topspin Communications. All rights reserved. + * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/security.h> +#include <linux/notifier.h> +#include <rdma/rdma_netlink.h> +#include <rdma/ib_addr.h> +#include <rdma/ib_cache.h> + +#include "core_priv.h" + +MODULE_AUTHOR("Roland Dreier"); +MODULE_DESCRIPTION("core kernel InfiniBand API"); +MODULE_LICENSE("Dual BSD/GPL"); + +struct ib_client_data { + struct list_head list; + struct ib_client *client; + void * data; + /* The device or client is going down. Do not call client or device + * callbacks other than remove(). */ + bool going_down; +}; + +struct workqueue_struct *ib_comp_wq; +struct workqueue_struct *ib_comp_unbound_wq; +struct workqueue_struct *ib_wq; +EXPORT_SYMBOL_GPL(ib_wq); + +/* The device_list and client_list contain devices and clients after their + * registration has completed, and the devices and clients are removed + * during unregistration. */ +static LIST_HEAD(device_list); +static LIST_HEAD(client_list); + +/* + * device_mutex and lists_rwsem protect access to both device_list and + * client_list. device_mutex protects writer access by device and client + * registration / de-registration. lists_rwsem protects reader access to + * these lists. Iterators of these lists must lock it for read, while updates + * to the lists must be done with a write lock. A special case is when the + * device_mutex is locked. In this case locking the lists for read access is + * not necessary as the device_mutex implies it. + * + * lists_rwsem also protects access to the client data list. + */ +static DEFINE_MUTEX(device_mutex); +static DECLARE_RWSEM(lists_rwsem); + +static int ib_security_change(struct notifier_block *nb, unsigned long event, + void *lsm_data); +static void ib_policy_change_task(struct work_struct *work); +static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task); + +static struct notifier_block ibdev_lsm_nb = { + .notifier_call = ib_security_change, +}; + +static int ib_device_check_mandatory(struct ib_device *device) +{ +#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x } + static const struct { + size_t offset; + char *name; + } mandatory_table[] = { + IB_MANDATORY_FUNC(query_device), + IB_MANDATORY_FUNC(query_port), + IB_MANDATORY_FUNC(query_pkey), + IB_MANDATORY_FUNC(alloc_pd), + IB_MANDATORY_FUNC(dealloc_pd), + IB_MANDATORY_FUNC(create_qp), + IB_MANDATORY_FUNC(modify_qp), + IB_MANDATORY_FUNC(destroy_qp), + IB_MANDATORY_FUNC(post_send), + IB_MANDATORY_FUNC(post_recv), + IB_MANDATORY_FUNC(create_cq), + IB_MANDATORY_FUNC(destroy_cq), + IB_MANDATORY_FUNC(poll_cq), + IB_MANDATORY_FUNC(req_notify_cq), + IB_MANDATORY_FUNC(get_dma_mr), + IB_MANDATORY_FUNC(dereg_mr), + IB_MANDATORY_FUNC(get_port_immutable) + }; + int i; + + for (i = 0; i < ARRAY_SIZE(mandatory_table); ++i) { + if (!*(void **) ((void *) device + mandatory_table[i].offset)) { + pr_warn("Device %s is missing mandatory function %s\n", + device->name, mandatory_table[i].name); + return -EINVAL; + } + } + + return 0; +} + +static struct ib_device *__ib_device_get_by_index(u32 index) +{ + struct ib_device *device; + + list_for_each_entry(device, &device_list, core_list) + if (device->index == index) + return device; + + return NULL; +} + +/* + * Caller is responsible to return refrerence count by calling put_device() + */ +struct ib_device *ib_device_get_by_index(u32 index) +{ + struct ib_device *device; + + down_read(&lists_rwsem); + device = __ib_device_get_by_index(index); + if (device) + get_device(&device->dev); + + up_read(&lists_rwsem); + return device; +} + +static struct ib_device *__ib_device_get_by_name(const char *name) +{ + struct ib_device *device; + + list_for_each_entry(device, &device_list, core_list) + if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX)) + return device; + + return NULL; +} + +static int alloc_name(char *name) +{ + unsigned long *inuse; + char buf[IB_DEVICE_NAME_MAX]; + struct ib_device *device; + int i; + + inuse = (unsigned long *) get_zeroed_page(GFP_KERNEL); + if (!inuse) + return -ENOMEM; + + list_for_each_entry(device, &device_list, core_list) { + if (!sscanf(device->name, name, &i)) + continue; + if (i < 0 || i >= PAGE_SIZE * 8) + continue; + snprintf(buf, sizeof buf, name, i); + if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX)) + set_bit(i, inuse); + } + + i = find_first_zero_bit(inuse, PAGE_SIZE * 8); + free_page((unsigned long) inuse); + snprintf(buf, sizeof buf, name, i); + + if (__ib_device_get_by_name(buf)) + return -ENFILE; + + strlcpy(name, buf, IB_DEVICE_NAME_MAX); + return 0; +} + +static void ib_device_release(struct device *device) +{ + struct ib_device *dev = container_of(device, struct ib_device, dev); + + WARN_ON(dev->reg_state == IB_DEV_REGISTERED); + if (dev->reg_state == IB_DEV_UNREGISTERED) { + /* + * In IB_DEV_UNINITIALIZED state, cache or port table + * is not even created. Free cache and port table only when + * device reaches UNREGISTERED state. + */ + ib_cache_release_one(dev); + kfree(dev->port_immutable); + } + kfree(dev); +} + +static int ib_device_uevent(struct device *device, + struct kobj_uevent_env *env) +{ + struct ib_device *dev = container_of(device, struct ib_device, dev); + + if (add_uevent_var(env, "NAME=%s", dev->name)) + return -ENOMEM; + + /* + * It would be nice to pass the node GUID with the event... + */ + + return 0; +} + +static struct class ib_class = { + .name = "infiniband", + .dev_release = ib_device_release, + .dev_uevent = ib_device_uevent, +}; + +/** + * ib_alloc_device - allocate an IB device struct + * @size:size of structure to allocate + * + * Low-level drivers should use ib_alloc_device() to allocate &struct + * ib_device. @size is the size of the structure to be allocated, + * including any private data used by the low-level driver. + * ib_dealloc_device() must be used to free structures allocated with + * ib_alloc_device(). + */ +struct ib_device *ib_alloc_device(size_t size) +{ + struct ib_device *device; + + if (WARN_ON(size < sizeof(struct ib_device))) + return NULL; + + device = kzalloc(size, GFP_KERNEL); + if (!device) + return NULL; + + rdma_restrack_init(&device->res); + + device->dev.class = &ib_class; + device_initialize(&device->dev); + + dev_set_drvdata(&device->dev, device); + + INIT_LIST_HEAD(&device->event_handler_list); + spin_lock_init(&device->event_handler_lock); + spin_lock_init(&device->client_data_lock); + INIT_LIST_HEAD(&device->client_data_list); + INIT_LIST_HEAD(&device->port_list); + + return device; +} +EXPORT_SYMBOL(ib_alloc_device); + +/** + * ib_dealloc_device - free an IB device struct + * @device:structure to free + * + * Free a structure allocated with ib_alloc_device(). + */ +void ib_dealloc_device(struct ib_device *device) +{ + WARN_ON(device->reg_state != IB_DEV_UNREGISTERED && + device->reg_state != IB_DEV_UNINITIALIZED); + rdma_restrack_clean(&device->res); + put_device(&device->dev); +} +EXPORT_SYMBOL(ib_dealloc_device); + +static int add_client_context(struct ib_device *device, struct ib_client *client) +{ + struct ib_client_data *context; + unsigned long flags; + + context = kmalloc(sizeof *context, GFP_KERNEL); + if (!context) + return -ENOMEM; + + context->client = client; + context->data = NULL; + context->going_down = false; + + down_write(&lists_rwsem); + spin_lock_irqsave(&device->client_data_lock, flags); + list_add(&context->list, &device->client_data_list); + spin_unlock_irqrestore(&device->client_data_lock, flags); + up_write(&lists_rwsem); + + return 0; +} + +static int verify_immutable(const struct ib_device *dev, u8 port) +{ + return WARN_ON(!rdma_cap_ib_mad(dev, port) && + rdma_max_mad_size(dev, port) != 0); +} + +static int read_port_immutable(struct ib_device *device) +{ + int ret; + u8 start_port = rdma_start_port(device); + u8 end_port = rdma_end_port(device); + u8 port; + + /** + * device->port_immutable is indexed directly by the port number to make + * access to this data as efficient as possible. + * + * Therefore port_immutable is declared as a 1 based array with + * potential empty slots at the beginning. + */ + device->port_immutable = kcalloc(end_port + 1, + sizeof(*device->port_immutable), + GFP_KERNEL); + if (!device->port_immutable) + return -ENOMEM; + + for (port = start_port; port <= end_port; ++port) { + ret = device->get_port_immutable(device, port, + &device->port_immutable[port]); + if (ret) + return ret; + + if (verify_immutable(device, port)) + return -EINVAL; + } + return 0; +} + +void ib_get_device_fw_str(struct ib_device *dev, char *str) +{ + if (dev->get_dev_fw_str) + dev->get_dev_fw_str(dev, str); + else + str[0] = '\0'; +} +EXPORT_SYMBOL(ib_get_device_fw_str); + +static int setup_port_pkey_list(struct ib_device *device) +{ + int i; + + /** + * device->port_pkey_list is indexed directly by the port number, + * Therefore it is declared as a 1 based array with potential empty + * slots at the beginning. + */ + device->port_pkey_list = kcalloc(rdma_end_port(device) + 1, + sizeof(*device->port_pkey_list), + GFP_KERNEL); + + if (!device->port_pkey_list) + return -ENOMEM; + + for (i = 0; i < (rdma_end_port(device) + 1); i++) { + spin_lock_init(&device->port_pkey_list[i].list_lock); + INIT_LIST_HEAD(&device->port_pkey_list[i].pkey_list); + } + + return 0; +} + +static void ib_policy_change_task(struct work_struct *work) +{ + struct ib_device *dev; + + down_read(&lists_rwsem); + list_for_each_entry(dev, &device_list, core_list) { + int i; + + for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) { + u64 sp; + int ret = ib_get_cached_subnet_prefix(dev, + i, + &sp); + + WARN_ONCE(ret, + "ib_get_cached_subnet_prefix err: %d, this should never happen here\n", + ret); + if (!ret) + ib_security_cache_change(dev, i, sp); + } + } + up_read(&lists_rwsem); +} + +static int ib_security_change(struct notifier_block *nb, unsigned long event, + void *lsm_data) +{ + if (event != LSM_POLICY_CHANGE) + return NOTIFY_DONE; + + schedule_work(&ib_policy_change_work); + + return NOTIFY_OK; +} + +/** + * __dev_new_index - allocate an device index + * + * Returns a suitable unique value for a new device interface + * number. It assumes that there are less than 2^32-1 ib devices + * will be present in the system. + */ +static u32 __dev_new_index(void) +{ + /* + * The device index to allow stable naming. + * Similar to struct net -> ifindex. + */ + static u32 index; + + for (;;) { + if (!(++index)) + index = 1; + + if (!__ib_device_get_by_index(index)) + return index; + } +} + +/** + * ib_register_device - Register an IB device with IB core + * @device:Device to register + * + * Low-level drivers use ib_register_device() to register their + * devices with the IB core. All registered clients will receive a + * callback for each device that is added. @device must be allocated + * with ib_alloc_device(). + */ +int ib_register_device(struct ib_device *device, + int (*port_callback)(struct ib_device *, + u8, struct kobject *)) +{ + int ret; + struct ib_client *client; + struct ib_udata uhw = {.outlen = 0, .inlen = 0}; + struct device *parent = device->dev.parent; + + WARN_ON_ONCE(device->dma_device); + if (device->dev.dma_ops) { + /* + * The caller provided custom DMA operations. Copy the + * DMA-related fields that are used by e.g. dma_alloc_coherent() + * into device->dev. + */ + device->dma_device = &device->dev; + if (!device->dev.dma_mask) { + if (parent) + device->dev.dma_mask = parent->dma_mask; + else + WARN_ON_ONCE(true); + } + if (!device->dev.coherent_dma_mask) { + if (parent) + device->dev.coherent_dma_mask = + parent->coherent_dma_mask; + else + WARN_ON_ONCE(true); + } + } else { + /* + * The caller did not provide custom DMA operations. Use the + * DMA mapping operations of the parent device. + */ + WARN_ON_ONCE(!parent); + device->dma_device = parent; + } + + mutex_lock(&device_mutex); + + if (strchr(device->name, '%')) { + ret = alloc_name(device->name); + if (ret) + goto out; + } + + if (ib_device_check_mandatory(device)) { + ret = -EINVAL; + goto out; + } + + ret = read_port_immutable(device); + if (ret) { + pr_warn("Couldn't create per port immutable data %s\n", + device->name); + goto out; + } + + ret = setup_port_pkey_list(device); + if (ret) { + pr_warn("Couldn't create per port_pkey_list\n"); + goto out; + } + + ret = ib_cache_setup_one(device); + if (ret) { + pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n"); + goto port_cleanup; + } + + ret = ib_device_register_rdmacg(device); + if (ret) { + pr_warn("Couldn't register device with rdma cgroup\n"); + goto cache_cleanup; + } + + memset(&device->attrs, 0, sizeof(device->attrs)); + ret = device->query_device(device, &device->attrs, &uhw); + if (ret) { + pr_warn("Couldn't query the device attributes\n"); + goto cg_cleanup; + } + + ret = ib_device_register_sysfs(device, port_callback); + if (ret) { + pr_warn("Couldn't register device %s with driver model\n", + device->name); + goto cg_cleanup; + } + + device->reg_state = IB_DEV_REGISTERED; + + list_for_each_entry(client, &client_list, list) + if (!add_client_context(device, client) && client->add) + client->add(device); + + device->index = __dev_new_index(); + down_write(&lists_rwsem); + list_add_tail(&device->core_list, &device_list); + up_write(&lists_rwsem); + mutex_unlock(&device_mutex); + return 0; + +cg_cleanup: + ib_device_unregister_rdmacg(device); +cache_cleanup: + ib_cache_cleanup_one(device); + ib_cache_release_one(device); +port_cleanup: + kfree(device->port_immutable); +out: + mutex_unlock(&device_mutex); + return ret; +} +EXPORT_SYMBOL(ib_register_device); + +/** + * ib_unregister_device - Unregister an IB device + * @device:Device to unregister + * + * Unregister an IB device. All clients will receive a remove callback. + */ +void ib_unregister_device(struct ib_device *device) +{ + struct ib_client_data *context, *tmp; + unsigned long flags; + + mutex_lock(&device_mutex); + + down_write(&lists_rwsem); + list_del(&device->core_list); + spin_lock_irqsave(&device->client_data_lock, flags); + list_for_each_entry_safe(context, tmp, &device->client_data_list, list) + context->going_down = true; + spin_unlock_irqrestore(&device->client_data_lock, flags); + downgrade_write(&lists_rwsem); + + list_for_each_entry_safe(context, tmp, &device->client_data_list, + list) { + if (context->client->remove) + context->client->remove(device, context->data); + } + up_read(&lists_rwsem); + + ib_device_unregister_sysfs(device); + ib_device_unregister_rdmacg(device); + + mutex_unlock(&device_mutex); + + ib_cache_cleanup_one(device); + + ib_security_destroy_port_pkey_list(device); + kfree(device->port_pkey_list); + + down_write(&lists_rwsem); + spin_lock_irqsave(&device->client_data_lock, flags); + list_for_each_entry_safe(context, tmp, &device->client_data_list, list) + kfree(context); + spin_unlock_irqrestore(&device->client_data_lock, flags); + up_write(&lists_rwsem); + + device->reg_state = IB_DEV_UNREGISTERED; +} +EXPORT_SYMBOL(ib_unregister_device); + +/** + * ib_register_client - Register an IB client + * @client:Client to register + * + * Upper level users of the IB drivers can use ib_register_client() to + * register callbacks for IB device addition and removal. When an IB + * device is added, each registered client's add method will be called + * (in the order the clients were registered), and when a device is + * removed, each client's remove method will be called (in the reverse + * order that clients were registered). In addition, when + * ib_register_client() is called, the client will receive an add + * callback for all devices already registered. + */ +int ib_register_client(struct ib_client *client) +{ + struct ib_device *device; + + mutex_lock(&device_mutex); + + list_for_each_entry(device, &device_list, core_list) + if (!add_client_context(device, client) && client->add) + client->add(device); + + down_write(&lists_rwsem); + list_add_tail(&client->list, &client_list); + up_write(&lists_rwsem); + + mutex_unlock(&device_mutex); + + return 0; +} +EXPORT_SYMBOL(ib_register_client); + +/** + * ib_unregister_client - Unregister an IB client + * @client:Client to unregister + * + * Upper level users use ib_unregister_client() to remove their client + * registration. When ib_unregister_client() is called, the client + * will receive a remove callback for each IB device still registered. + */ +void ib_unregister_client(struct ib_client *client) +{ + struct ib_client_data *context, *tmp; + struct ib_device *device; + unsigned long flags; + + mutex_lock(&device_mutex); + + down_write(&lists_rwsem); + list_del(&client->list); + up_write(&lists_rwsem); + + list_for_each_entry(device, &device_list, core_list) { + struct ib_client_data *found_context = NULL; + + down_write(&lists_rwsem); + spin_lock_irqsave(&device->client_data_lock, flags); + list_for_each_entry_safe(context, tmp, &device->client_data_list, list) + if (context->client == client) { + context->going_down = true; + found_context = context; + break; + } + spin_unlock_irqrestore(&device->client_data_lock, flags); + up_write(&lists_rwsem); + + if (client->remove) + client->remove(device, found_context ? + found_context->data : NULL); + + if (!found_context) { + pr_warn("No client context found for %s/%s\n", + device->name, client->name); + continue; + } + + down_write(&lists_rwsem); + spin_lock_irqsave(&device->client_data_lock, flags); + list_del(&found_context->list); + kfree(found_context); + spin_unlock_irqrestore(&device->client_data_lock, flags); + up_write(&lists_rwsem); + } + + mutex_unlock(&device_mutex); +} +EXPORT_SYMBOL(ib_unregister_client); + +/** + * ib_get_client_data - Get IB client context + * @device:Device to get context for + * @client:Client to get context for + * + * ib_get_client_data() returns client context set with + * ib_set_client_data(). + */ +void *ib_get_client_data(struct ib_device *device, struct ib_client *client) +{ + struct ib_client_data *context; + void *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&device->client_data_lock, flags); + list_for_each_entry(context, &device->client_data_list, list) + if (context->client == client) { + ret = context->data; + break; + } + spin_unlock_irqrestore(&device->client_data_lock, flags); + + return ret; +} +EXPORT_SYMBOL(ib_get_client_data); + +/** + * ib_set_client_data - Set IB client context + * @device:Device to set context for + * @client:Client to set context for + * @data:Context to set + * + * ib_set_client_data() sets client context that can be retrieved with + * ib_get_client_data(). + */ +void ib_set_client_data(struct ib_device *device, struct ib_client *client, + void *data) +{ + struct ib_client_data *context; + unsigned long flags; + + spin_lock_irqsave(&device->client_data_lock, flags); + list_for_each_entry(context, &device->client_data_list, list) + if (context->client == client) { + context->data = data; + goto out; + } + + pr_warn("No client context found for %s/%s\n", + device->name, client->name); + +out: + spin_unlock_irqrestore(&device->client_data_lock, flags); +} +EXPORT_SYMBOL(ib_set_client_data); + +/** + * ib_register_event_handler - Register an IB event handler + * @event_handler:Handler to register + * + * ib_register_event_handler() registers an event handler that will be + * called back when asynchronous IB events occur (as defined in + * chapter 11 of the InfiniBand Architecture Specification). This + * callback may occur in interrupt context. + */ +void ib_register_event_handler(struct ib_event_handler *event_handler) +{ + unsigned long flags; + + spin_lock_irqsave(&event_handler->device->event_handler_lock, flags); + list_add_tail(&event_handler->list, + &event_handler->device->event_handler_list); + spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags); +} +EXPORT_SYMBOL(ib_register_event_handler); + +/** + * ib_unregister_event_handler - Unregister an event handler + * @event_handler:Handler to unregister + * + * Unregister an event handler registered with + * ib_register_event_handler(). + */ +void ib_unregister_event_handler(struct ib_event_handler *event_handler) +{ + unsigned long flags; + + spin_lock_irqsave(&event_handler->device->event_handler_lock, flags); + list_del(&event_handler->list); + spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags); +} +EXPORT_SYMBOL(ib_unregister_event_handler); + +/** + * ib_dispatch_event - Dispatch an asynchronous event + * @event:Event to dispatch + * + * Low-level drivers must call ib_dispatch_event() to dispatch the + * event to all registered event handlers when an asynchronous event + * occurs. + */ +void ib_dispatch_event(struct ib_event *event) +{ + unsigned long flags; + struct ib_event_handler *handler; + + spin_lock_irqsave(&event->device->event_handler_lock, flags); + + list_for_each_entry(handler, &event->device->event_handler_list, list) + handler->handler(handler, event); + + spin_unlock_irqrestore(&event->device->event_handler_lock, flags); +} +EXPORT_SYMBOL(ib_dispatch_event); + +/** + * ib_query_port - Query IB port attributes + * @device:Device to query + * @port_num:Port number to query + * @port_attr:Port attributes + * + * ib_query_port() returns the attributes of a port through the + * @port_attr pointer. + */ +int ib_query_port(struct ib_device *device, + u8 port_num, + struct ib_port_attr *port_attr) +{ + union ib_gid gid; + int err; + + if (!rdma_is_port_valid(device, port_num)) + return -EINVAL; + + memset(port_attr, 0, sizeof(*port_attr)); + err = device->query_port(device, port_num, port_attr); + if (err || port_attr->subnet_prefix) + return err; + + if (rdma_port_get_link_layer(device, port_num) != IB_LINK_LAYER_INFINIBAND) + return 0; + + err = device->query_gid(device, port_num, 0, &gid); + if (err) + return err; + + port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix); + return 0; +} +EXPORT_SYMBOL(ib_query_port); + +/** + * ib_enum_roce_netdev - enumerate all RoCE ports + * @ib_dev : IB device we want to query + * @filter: Should we call the callback? + * @filter_cookie: Cookie passed to filter + * @cb: Callback to call for each found RoCE ports + * @cookie: Cookie passed back to the callback + * + * Enumerates all of the physical RoCE ports of ib_dev + * which are related to netdevice and calls callback() on each + * device for which filter() function returns non zero. + */ +void ib_enum_roce_netdev(struct ib_device *ib_dev, + roce_netdev_filter filter, + void *filter_cookie, + roce_netdev_callback cb, + void *cookie) +{ + u8 port; + + for (port = rdma_start_port(ib_dev); port <= rdma_end_port(ib_dev); + port++) + if (rdma_protocol_roce(ib_dev, port)) { + struct net_device *idev = NULL; + + if (ib_dev->get_netdev) + idev = ib_dev->get_netdev(ib_dev, port); + + if (idev && + idev->reg_state >= NETREG_UNREGISTERED) { + dev_put(idev); + idev = NULL; + } + + if (filter(ib_dev, port, idev, filter_cookie)) + cb(ib_dev, port, idev, cookie); + + if (idev) + dev_put(idev); + } +} + +/** + * ib_enum_all_roce_netdevs - enumerate all RoCE devices + * @filter: Should we call the callback? + * @filter_cookie: Cookie passed to filter + * @cb: Callback to call for each found RoCE ports + * @cookie: Cookie passed back to the callback + * + * Enumerates all RoCE devices' physical ports which are related + * to netdevices and calls callback() on each device for which + * filter() function returns non zero. + */ +void ib_enum_all_roce_netdevs(roce_netdev_filter filter, + void *filter_cookie, + roce_netdev_callback cb, + void *cookie) +{ + struct ib_device *dev; + + down_read(&lists_rwsem); + list_for_each_entry(dev, &device_list, core_list) + ib_enum_roce_netdev(dev, filter, filter_cookie, cb, cookie); + up_read(&lists_rwsem); +} + +/** + * ib_enum_all_devs - enumerate all ib_devices + * @cb: Callback to call for each found ib_device + * + * Enumerates all ib_devices and calls callback() on each device. + */ +int ib_enum_all_devs(nldev_callback nldev_cb, struct sk_buff *skb, + struct netlink_callback *cb) +{ + struct ib_device *dev; + unsigned int idx = 0; + int ret = 0; + + down_read(&lists_rwsem); + list_for_each_entry(dev, &device_list, core_list) { + ret = nldev_cb(dev, skb, cb, idx); + if (ret) + break; + idx++; + } + + up_read(&lists_rwsem); + return ret; +} + +/** + * ib_query_pkey - Get P_Key table entry + * @device:Device to query + * @port_num:Port number to query + * @index:P_Key table index to query + * @pkey:Returned P_Key + * + * ib_query_pkey() fetches the specified P_Key table entry. + */ +int ib_query_pkey(struct ib_device *device, + u8 port_num, u16 index, u16 *pkey) +{ + return device->query_pkey(device, port_num, index, pkey); +} +EXPORT_SYMBOL(ib_query_pkey); + +/** + * ib_modify_device - Change IB device attributes + * @device:Device to modify + * @device_modify_mask:Mask of attributes to change + * @device_modify:New attribute values + * + * ib_modify_device() changes a device's attributes as specified by + * the @device_modify_mask and @device_modify structure. + */ +int ib_modify_device(struct ib_device *device, + int device_modify_mask, + struct ib_device_modify *device_modify) +{ + if (!device->modify_device) + return -ENOSYS; + + return device->modify_device(device, device_modify_mask, + device_modify); +} +EXPORT_SYMBOL(ib_modify_device); + +/** + * ib_modify_port - Modifies the attributes for the specified port. + * @device: The device to modify. + * @port_num: The number of the port to modify. + * @port_modify_mask: Mask used to specify which attributes of the port + * to change. + * @port_modify: New attribute values for the port. + * + * ib_modify_port() changes a port's attributes as specified by the + * @port_modify_mask and @port_modify structure. + */ +int ib_modify_port(struct ib_device *device, + u8 port_num, int port_modify_mask, + struct ib_port_modify *port_modify) +{ + int rc; + + if (!rdma_is_port_valid(device, port_num)) + return -EINVAL; + + if (device->modify_port) + rc = device->modify_port(device, port_num, port_modify_mask, + port_modify); + else + rc = rdma_protocol_roce(device, port_num) ? 0 : -ENOSYS; + return rc; +} +EXPORT_SYMBOL(ib_modify_port); + +/** + * ib_find_gid - Returns the port number and GID table index where + * a specified GID value occurs. Its searches only for IB link layer. + * @device: The device to query. + * @gid: The GID value to search for. + * @port_num: The port number of the device where the GID value was found. + * @index: The index into the GID table where the GID was found. This + * parameter may be NULL. + */ +int ib_find_gid(struct ib_device *device, union ib_gid *gid, + u8 *port_num, u16 *index) +{ + union ib_gid tmp_gid; + int ret, port, i; + + for (port = rdma_start_port(device); port <= rdma_end_port(device); ++port) { + if (!rdma_protocol_ib(device, port)) + continue; + + for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) { + ret = rdma_query_gid(device, port, i, &tmp_gid); + if (ret) + continue; + + if (!memcmp(&tmp_gid, gid, sizeof *gid)) { + *port_num = port; + if (index) + *index = i; + return 0; + } + } + } + + return -ENOENT; +} +EXPORT_SYMBOL(ib_find_gid); + +/** + * ib_find_pkey - Returns the PKey table index where a specified + * PKey value occurs. + * @device: The device to query. + * @port_num: The port number of the device to search for the PKey. + * @pkey: The PKey value to search for. + * @index: The index into the PKey table where the PKey was found. + */ +int ib_find_pkey(struct ib_device *device, + u8 port_num, u16 pkey, u16 *index) +{ + int ret, i; + u16 tmp_pkey; + int partial_ix = -1; + + for (i = 0; i < device->port_immutable[port_num].pkey_tbl_len; ++i) { + ret = ib_query_pkey(device, port_num, i, &tmp_pkey); + if (ret) + return ret; + if ((pkey & 0x7fff) == (tmp_pkey & 0x7fff)) { + /* if there is full-member pkey take it.*/ + if (tmp_pkey & 0x8000) { + *index = i; + return 0; + } + if (partial_ix < 0) + partial_ix = i; + } + } + + /*no full-member, if exists take the limited*/ + if (partial_ix >= 0) { + *index = partial_ix; + return 0; + } + return -ENOENT; +} +EXPORT_SYMBOL(ib_find_pkey); + +/** + * ib_get_net_dev_by_params() - Return the appropriate net_dev + * for a received CM request + * @dev: An RDMA device on which the request has been received. + * @port: Port number on the RDMA device. + * @pkey: The Pkey the request came on. + * @gid: A GID that the net_dev uses to communicate. + * @addr: Contains the IP address that the request specified as its + * destination. + */ +struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, + u8 port, + u16 pkey, + const union ib_gid *gid, + const struct sockaddr *addr) +{ + struct net_device *net_dev = NULL; + struct ib_client_data *context; + + if (!rdma_protocol_ib(dev, port)) + return NULL; + + down_read(&lists_rwsem); + + list_for_each_entry(context, &dev->client_data_list, list) { + struct ib_client *client = context->client; + + if (context->going_down) + continue; + + if (client->get_net_dev_by_params) { + net_dev = client->get_net_dev_by_params(dev, port, pkey, + gid, addr, + context->data); + if (net_dev) + break; + } + } + + up_read(&lists_rwsem); + + return net_dev; +} +EXPORT_SYMBOL(ib_get_net_dev_by_params); + +static const struct rdma_nl_cbs ibnl_ls_cb_table[RDMA_NL_LS_NUM_OPS] = { + [RDMA_NL_LS_OP_RESOLVE] = { + .doit = ib_nl_handle_resolve_resp, + .flags = RDMA_NL_ADMIN_PERM, + }, + [RDMA_NL_LS_OP_SET_TIMEOUT] = { + .doit = ib_nl_handle_set_timeout, + .flags = RDMA_NL_ADMIN_PERM, + }, + [RDMA_NL_LS_OP_IP_RESOLVE] = { + .doit = ib_nl_handle_ip_res_resp, + .flags = RDMA_NL_ADMIN_PERM, + }, +}; + +static int __init ib_core_init(void) +{ + int ret; + + ib_wq = alloc_workqueue("infiniband", 0, 0); + if (!ib_wq) + return -ENOMEM; + + ib_comp_wq = alloc_workqueue("ib-comp-wq", + WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_SYSFS, 0); + if (!ib_comp_wq) { + ret = -ENOMEM; + goto err; + } + + ib_comp_unbound_wq = + alloc_workqueue("ib-comp-unb-wq", + WQ_UNBOUND | WQ_HIGHPRI | WQ_MEM_RECLAIM | + WQ_SYSFS, WQ_UNBOUND_MAX_ACTIVE); + if (!ib_comp_unbound_wq) { + ret = -ENOMEM; + goto err_comp; + } + + ret = class_register(&ib_class); + if (ret) { + pr_warn("Couldn't create InfiniBand device class\n"); + goto err_comp_unbound; + } + + ret = rdma_nl_init(); + if (ret) { + pr_warn("Couldn't init IB netlink interface: err %d\n", ret); + goto err_sysfs; + } + + ret = addr_init(); + if (ret) { + pr_warn("Could't init IB address resolution\n"); + goto err_ibnl; + } + + ret = ib_mad_init(); + if (ret) { + pr_warn("Couldn't init IB MAD\n"); + goto err_addr; + } + + ret = ib_sa_init(); + if (ret) { + pr_warn("Couldn't init SA\n"); + goto err_mad; + } + + ret = register_lsm_notifier(&ibdev_lsm_nb); + if (ret) { + pr_warn("Couldn't register LSM notifier. ret %d\n", ret); + goto err_sa; + } + + nldev_init(); + rdma_nl_register(RDMA_NL_LS, ibnl_ls_cb_table); + roce_gid_mgmt_init(); + + return 0; + +err_sa: + ib_sa_cleanup(); +err_mad: + ib_mad_cleanup(); +err_addr: + addr_cleanup(); +err_ibnl: + rdma_nl_exit(); +err_sysfs: + class_unregister(&ib_class); +err_comp_unbound: + destroy_workqueue(ib_comp_unbound_wq); +err_comp: + destroy_workqueue(ib_comp_wq); +err: + destroy_workqueue(ib_wq); + return ret; +} + +static void __exit ib_core_cleanup(void) +{ + roce_gid_mgmt_cleanup(); + nldev_exit(); + rdma_nl_unregister(RDMA_NL_LS); + unregister_lsm_notifier(&ibdev_lsm_nb); + ib_sa_cleanup(); + ib_mad_cleanup(); + addr_cleanup(); + rdma_nl_exit(); + class_unregister(&ib_class); + destroy_workqueue(ib_comp_unbound_wq); + destroy_workqueue(ib_comp_wq); + /* Make sure that any pending umem accounting work is done. */ + destroy_workqueue(ib_wq); +} + +MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_LS, 4); + +subsys_initcall(ib_core_init); +module_exit(ib_core_cleanup); |