FreeBSD/Linux Kernel Cross Reference
sys/ofed/drivers/infiniband/core/ib_device.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
      *
      * 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <linux/module.h>
    #include <linux/string.h>
    #include <linux/errno.h>
    #include <linux/kernel.h>
    #include <linux/slab.h>
    #include <linux/mutex.h>
    #include <linux/netdevice.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_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_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(query_gid),
                   IB_MANDATORY_FUNC(alloc_pd),
                   IB_MANDATORY_FUNC(dealloc_pd),
                   IB_MANDATORY_FUNC(create_ah),
                   IB_MANDATORY_FUNC(destroy_ah),
                   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 **) ((char *) 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_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 struct class ib_class = {
           .name    = "infiniband",
           .dev_release = ib_device_release,
   };
   
   /**
    * 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;
   
           device->dev.parent = &linux_root_device;
           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);
           kobject_put(&device->dev.kobj);
   }
   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) {
                   pr_warn("Couldn't allocate client context for %s/%s\n",
                           device->name, client->name);
                   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 = kzalloc(sizeof(*device->port_immutable)
                                            * (end_port + 1),
                                            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, size_t str_len)
   {
           if (dev->get_dev_fw_str)
                   dev->get_dev_fw_str(dev, str, str_len);
           else
                   str[0] = '\0';
   }
   EXPORT_SYMBOL(ib_get_device_fw_str);
   
   /**
    * 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};
   
           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 = ib_cache_setup_one(device);
           if (ret) {
                   pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n");
                   goto port_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 cache_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 cache_cleanup;
           }
   
           device->reg_state = IB_DEV_REGISTERED;
   
           list_for_each_entry(client, &client_list, list)
                   if (client->add && !add_client_context(device, client))
                           client->add(device);
   
           down_write(&lists_rwsem);
           list_add_tail(&device->core_list, &device_list);
           up_write(&lists_rwsem);
           mutex_unlock(&device_mutex);
           return 0;
   
   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);
   
           mutex_unlock(&device_mutex);
   
           ib_device_unregister_sysfs(device);
           ib_cache_cleanup_one(device);
   
           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 (client->add && !add_client_context(device, client))
                           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.
    */
   int 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);
   
           return 0;
   }
   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().
    */
   int 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);
   
           return 0;
   }
   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 = ib_query_gid(device, port_num, 0, &gid, NULL);
           if (err)
                   return err;
   
           port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
           return 0;
   }
   EXPORT_SYMBOL(ib_query_port);
   
   /**
    * ib_query_gid - Get GID table entry
    * @device:Device to query
    * @port_num:Port number to query
    * @index:GID table index to query
    * @gid:Returned GID
    * @attr: Returned GID attributes related to this GID index (only in RoCE).
    *   NULL means ignore.
    *
    * ib_query_gid() fetches the specified GID table entry.
    */
   int ib_query_gid(struct ib_device *device,
                    u8 port_num, int index, union ib_gid *gid,
                    struct ib_gid_attr *attr)
   {
           if (rdma_cap_roce_gid_table(device, port_num))
                   return ib_get_cached_gid(device, port_num, index, gid, attr);
   
           if (attr)
                   return -EINVAL;
   
           return device->query_gid(device, port_num, index, gid);
   }
   EXPORT_SYMBOL(ib_query_gid);
   
   /**
    * 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 ifnet *idev = NULL;
   
                           if (ib_dev->get_netdev)
                                   idev = ib_dev->get_netdev(ib_dev, port);
   
                           if (idev && (idev->if_flags & IFF_DYING)) {
                                   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_cache_gid_del_all_by_netdev - delete GIDs belonging a netdevice
    *
    * @ndev: Pointer to netdevice
    */
   void ib_cache_gid_del_all_by_netdev(struct ifnet *ndev)
   {
           struct ib_device *ib_dev;
           u8 port;
   
           down_read(&lists_rwsem);
           list_for_each_entry(ib_dev, &device_list, core_list) {
                   for (port = rdma_start_port(ib_dev);
                        port <= rdma_end_port(ib_dev);
                        port++) {
                           if (rdma_protocol_roce(ib_dev, port) == 0)
                                   continue;
                           (void) ib_cache_gid_del_all_netdev_gids(ib_dev, port, ndev);
                   }
           }
           up_read(&lists_rwsem);
   }
   
   /**
    * 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)
   {
           if (!rdma_is_port_valid(device, port_num))
                   return -EINVAL;
   
           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)
   {
           if (!device->modify_port)
                   return -ENOSYS;
   
           if (!rdma_is_port_valid(device, port_num))
                   return -EINVAL;
   
           return device->modify_port(device, port_num, port_modify_mask,
                                      port_modify);
   }
   EXPORT_SYMBOL(ib_modify_port);
   
   /**
    * ib_find_gid - Returns the port number and GID table index where
    *   a specified GID value occurs.
    * @device: The device to query.
    * @gid: The GID value to search for.
    * @gid_type: Type of GID.
    * @ndev: The ndev related to the GID 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,
                   enum ib_gid_type gid_type, struct ifnet *ndev,
                   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_cap_roce_gid_table(device, port)) {
                           if (!ib_find_cached_gid_by_port(device, gid, gid_type, port,
                                                           ndev, index)) {
                                   *port_num = port;
                                   return 0;
                           }
                   }
   
                   if (gid_type != IB_GID_TYPE_IB)
                           continue;
   
                   for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) {
                           ret = ib_query_gid(device, port, i, &tmp_gid, NULL);
                           if (ret)
                                   return ret;
                           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 ifnet *ib_get_net_dev_by_params(struct ib_device *dev,
                                               u8 port,
                                               u16 pkey,
                                               const union ib_gid *gid,
                                               const struct sockaddr *addr)
   {
           struct ifnet *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 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_UNBOUND | WQ_HIGHPRI | WQ_MEM_RECLAIM,
                          mp_ncpus * 4 /* WQ_UNBOUND_MAX_ACTIVE */);
          if (!ib_comp_wq) {
                  ret = -ENOMEM;
                  goto err;
          }
  
          ret = class_register(&ib_class);
          if (ret) {
                  pr_warn("Couldn't create InfiniBand device class\n");
                  goto err_comp;
          }
  
          ret = addr_init();
          if (ret) {
                  pr_warn("Could't init IB address resolution\n");
                  goto err_sysfs;
          }
  
          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;
          }
  
          ib_cache_setup();
  
          return 0;
  
  err_mad:
          ib_mad_cleanup();
  err_addr:
          addr_cleanup();
  err_sysfs:
          class_unregister(&ib_class);
  err_comp:
          destroy_workqueue(ib_comp_wq);
  err:
          destroy_workqueue(ib_wq);
          return ret;
  }
  
  static void __exit ib_core_cleanup(void)
  {
          ib_cache_cleanup();
          ib_sa_cleanup();
          ib_mad_cleanup();
          addr_cleanup();
          class_unregister(&ib_class);
          destroy_workqueue(ib_comp_wq);
          /* Make sure that any pending umem accounting work is done. */
          destroy_workqueue(ib_wq);
  }
  
  /*
   * Typical loading and unloading order values and their use:
   *
   * SI_ORDER_FIRST (default for module_init):
   *      Core modules (PCI, infiniband)
   * SI_ORDER_SECOND (default for module_exit):
   *      Infiniband core modules (CM)
   * SI_ORDER_THIRD:
   * SI_ORDER_FOURTH:
   *      Infiniband core modules (CMA)
   * SI_ORDER_FIFTH:
   *      Infiniband user-space modules (UCM,UCMA,UMAD,UVERBS,IPOIB)
   * SI_ORDER_SIXTH:
   *      Network HW driver modules
   * SI_ORDER_SEVENTH:
   *      Infiniband HW driver modules
   */
  module_init_order(ib_core_init, SI_ORDER_FIRST);
  module_exit_order(ib_core_cleanup, SI_ORDER_FIRST);
  
  MODULE_VERSION(ibcore, 1);
  MODULE_DEPEND(ibcore, linuxkpi, 1, 1, 1);

Cache object: 5f8d3614c19e1f5bf288ce3993451530