OSCL-LXR linux-6.0.1/​drivers/​infiniband/​core/​cache.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Intel Corporation. All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
  * Copyright (c) 2005 Voltaire, 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/if_vlan.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/netdevice.h>
 #include <net/addrconf.h>
 
 #include <rdma/ib_cache.h>
 
 #include "core_priv.h"
 
 struct ib_pkey_cache {
     int             table_len;
     u16             table[];
 };
 
 struct ib_update_work {
     struct work_struct work;
     struct ib_event event;
     bool enforce_security;
 };
 
 union ib_gid zgid;
 EXPORT_SYMBOL(zgid);
 
 enum gid_attr_find_mask {
     GID_ATTR_FIND_MASK_GID          = 1UL << 0,
     GID_ATTR_FIND_MASK_NETDEV   = 1UL << 1,
     GID_ATTR_FIND_MASK_DEFAULT  = 1UL << 2,
     GID_ATTR_FIND_MASK_GID_TYPE = 1UL << 3,
 };
 
 enum gid_table_entry_state {
     GID_TABLE_ENTRY_INVALID     = 1,
     GID_TABLE_ENTRY_VALID       = 2,
     /*
      * Indicates that entry is pending to be removed, there may
      * be active users of this GID entry.
      * When last user of the GID entry releases reference to it,
      * GID entry is detached from the table.
      */
     GID_TABLE_ENTRY_PENDING_DEL = 3,
 };
 
 struct roce_gid_ndev_storage {
     struct rcu_head rcu_head;
     struct net_device *ndev;
 };
 
 struct ib_gid_table_entry {
     struct kref         kref;
     struct work_struct      del_work;
     struct ib_gid_attr      attr;
     void                *context;
     /* Store the ndev pointer to release reference later on in
      * call_rcu context because by that time gid_table_entry
      * and attr might be already freed. So keep a copy of it.
      * ndev_storage is freed by rcu callback.
      */
     struct roce_gid_ndev_storage    *ndev_storage;
     enum gid_table_entry_state  state;
 };
 
 struct ib_gid_table {
     int             sz;
     /* In RoCE, adding a GID to the table requires:
      * (a) Find if this GID is already exists.
      * (b) Find a free space.
      * (c) Write the new GID
      *
      * Delete requires different set of operations:
      * (a) Find the GID
      * (b) Delete it.
      *
      **/
     /* Any writer to data_vec must hold this lock and the write side of
      * rwlock. Readers must hold only rwlock. All writers must be in a
      * sleepable context.
      */
     struct mutex            lock;
     /* rwlock protects data_vec[ix]->state and entry pointer.
      */
     rwlock_t            rwlock;
     struct ib_gid_table_entry   **data_vec;
     /* bit field, each bit indicates the index of default GID */
     u32             default_gid_indices;
 };
 
 static void dispatch_gid_change_event(struct ib_device *ib_dev, u32 port)
 {
     struct ib_event event;
 
     event.device        = ib_dev;
     event.element.port_num  = port;
     event.event     = IB_EVENT_GID_CHANGE;
 
     ib_dispatch_event_clients(&event);
 }
 
 static const char * const gid_type_str[] = {
     /* IB/RoCE v1 value is set for IB_GID_TYPE_IB and IB_GID_TYPE_ROCE for
      * user space compatibility reasons.
      */
     [IB_GID_TYPE_IB]    = "IB/RoCE v1",
     [IB_GID_TYPE_ROCE]  = "IB/RoCE v1",
     [IB_GID_TYPE_ROCE_UDP_ENCAP]    = "RoCE v2",
 };
 
 const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
 {
     if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
         return gid_type_str[gid_type];
 
     return "Invalid GID type";
 }
 EXPORT_SYMBOL(ib_cache_gid_type_str);
 
 /** rdma_is_zero_gid - Check if given GID is zero or not.
  * @gid:    GID to check
  * Returns true if given GID is zero, returns false otherwise.
  */
 bool rdma_is_zero_gid(const union ib_gid *gid)
 {
     return !memcmp(gid, &zgid, sizeof(*gid));
 }
 EXPORT_SYMBOL(rdma_is_zero_gid);
 
 /** is_gid_index_default - Check if a given index belongs to
  * reserved default GIDs or not.
  * @table:  GID table pointer
  * @index:  Index to check in GID table
  * Returns true if index is one of the reserved default GID index otherwise
  * returns false.
  */
 static bool is_gid_index_default(const struct ib_gid_table *table,
                  unsigned int index)
 {
     return index < 32 && (BIT(index) & table->default_gid_indices);
 }
 
 int ib_cache_gid_parse_type_str(const char *buf)
 {
     unsigned int i;
     size_t len;
     int err = -EINVAL;
 
     len = strlen(buf);
     if (len == 0)
         return -EINVAL;
 
     if (buf[len - 1] == '\n')
         len--;
 
     for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
         if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
             len == strlen(gid_type_str[i])) {
             err = i;
             break;
         }
 
     return err;
 }
 EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
 
 static struct ib_gid_table *rdma_gid_table(struct ib_device *device, u32 port)
 {
     return device->port_data[port].cache.gid;
 }
 
 static bool is_gid_entry_free(const struct ib_gid_table_entry *entry)
 {
     return !entry;
 }
 
 static bool is_gid_entry_valid(const struct ib_gid_table_entry *entry)
 {
     return entry && entry->state == GID_TABLE_ENTRY_VALID;
 }
 
 static void schedule_free_gid(struct kref *kref)
 {
     struct ib_gid_table_entry *entry =
             container_of(kref, struct ib_gid_table_entry, kref);
 
     queue_work(ib_wq, &entry->del_work);
 }
 
 static void put_gid_ndev(struct rcu_head *head)
 {
     struct roce_gid_ndev_storage *storage =
         container_of(head, struct roce_gid_ndev_storage, rcu_head);
 
     WARN_ON(!storage->ndev);
     /* At this point its safe to release netdev reference,
      * as all callers working on gid_attr->ndev are done
      * using this netdev.
      */
     dev_put(storage->ndev);
     kfree(storage);
 }
 
 static void free_gid_entry_locked(struct ib_gid_table_entry *entry)
 {
     struct ib_device *device = entry->attr.device;
     u32 port_num = entry->attr.port_num;
     struct ib_gid_table *table = rdma_gid_table(device, port_num);
 
     dev_dbg(&device->dev, "%s port=%u index=%u gid %pI6\n", __func__,
         port_num, entry->attr.index, entry->attr.gid.raw);
 
     write_lock_irq(&table->rwlock);
 
     /*
      * The only way to avoid overwriting NULL in table is
      * by comparing if it is same entry in table or not!
      * If new entry in table is added by the time we free here,
      * don't overwrite the table entry.
      */
     if (entry == table->data_vec[entry->attr.index])
         table->data_vec[entry->attr.index] = NULL;
     /* Now this index is ready to be allocated */
     write_unlock_irq(&table->rwlock);
 
     if (entry->ndev_storage)
         call_rcu(&entry->ndev_storage->rcu_head, put_gid_ndev);
     kfree(entry);
 }
 
 static void free_gid_entry(struct kref *kref)
 {
     struct ib_gid_table_entry *entry =
             container_of(kref, struct ib_gid_table_entry, kref);
 
     free_gid_entry_locked(entry);
 }
 
 /**
  * free_gid_work - Release reference to the GID entry
  * @work: Work structure to refer to GID entry which needs to be
  * deleted.
  *
  * free_gid_work() frees the entry from the HCA's hardware table
  * if provider supports it. It releases reference to netdevice.
  */
 static void free_gid_work(struct work_struct *work)
 {
     struct ib_gid_table_entry *entry =
         container_of(work, struct ib_gid_table_entry, del_work);
     struct ib_device *device = entry->attr.device;
     u32 port_num = entry->attr.port_num;
     struct ib_gid_table *table = rdma_gid_table(device, port_num);
 
     mutex_lock(&table->lock);
     free_gid_entry_locked(entry);
     mutex_unlock(&table->lock);
 }
 
 static struct ib_gid_table_entry *
 alloc_gid_entry(const struct ib_gid_attr *attr)
 {
     struct ib_gid_table_entry *entry;
     struct net_device *ndev;
 
     entry = kzalloc(sizeof(*entry), GFP_KERNEL);
     if (!entry)
         return NULL;
 
     ndev = rcu_dereference_protected(attr->ndev, 1);
     if (ndev) {
         entry->ndev_storage = kzalloc(sizeof(*entry->ndev_storage),
                           GFP_KERNEL);
         if (!entry->ndev_storage) {
             kfree(entry);
             return NULL;
         }
         dev_hold(ndev);
         entry->ndev_storage->ndev = ndev;
     }
     kref_init(&entry->kref);
     memcpy(&entry->attr, attr, sizeof(*attr));
     INIT_WORK(&entry->del_work, free_gid_work);
     entry->state = GID_TABLE_ENTRY_INVALID;
     return entry;
 }
 
 static void store_gid_entry(struct ib_gid_table *table,
                 struct ib_gid_table_entry *entry)
 {
     entry->state = GID_TABLE_ENTRY_VALID;
 
     dev_dbg(&entry->attr.device->dev, "%s port=%u index=%u gid %pI6\n",
         __func__, entry->attr.port_num, entry->attr.index,
         entry->attr.gid.raw);
 
     lockdep_assert_held(&table->lock);
     write_lock_irq(&table->rwlock);
     table->data_vec[entry->attr.index] = entry;
     write_unlock_irq(&table->rwlock);
 }
 
 static void get_gid_entry(struct ib_gid_table_entry *entry)
 {
     kref_get(&entry->kref);
 }
 
 static void put_gid_entry(struct ib_gid_table_entry *entry)
 {
     kref_put(&entry->kref, schedule_free_gid);
 }
 
 static void put_gid_entry_locked(struct ib_gid_table_entry *entry)
 {
     kref_put(&entry->kref, free_gid_entry);
 }
 
 static int add_roce_gid(struct ib_gid_table_entry *entry)
 {
     const struct ib_gid_attr *attr = &entry->attr;
     int ret;
 
     if (!attr->ndev) {
         dev_err(&attr->device->dev, "%s NULL netdev port=%u index=%u\n",
             __func__, attr->port_num, attr->index);
         return -EINVAL;
     }
     if (rdma_cap_roce_gid_table(attr->device, attr->port_num)) {
         ret = attr->device->ops.add_gid(attr, &entry->context);
         if (ret) {
             dev_err(&attr->device->dev,
                 "%s GID add failed port=%u index=%u\n",
                 __func__, attr->port_num, attr->index);
             return ret;
         }
     }
     return 0;
 }
 
 /**
  * del_gid - Delete GID table entry
  *
  * @ib_dev: IB device whose GID entry to be deleted
  * @port:   Port number of the IB device
  * @table:  GID table of the IB device for a port
  * @ix:     GID entry index to delete
  *
  */
 static void del_gid(struct ib_device *ib_dev, u32 port,
             struct ib_gid_table *table, int ix)
 {
     struct roce_gid_ndev_storage *ndev_storage;
     struct ib_gid_table_entry *entry;
 
     lockdep_assert_held(&table->lock);
 
     dev_dbg(&ib_dev->dev, "%s port=%u index=%d gid %pI6\n", __func__, port,
         ix, table->data_vec[ix]->attr.gid.raw);
 
     write_lock_irq(&table->rwlock);
     entry = table->data_vec[ix];
     entry->state = GID_TABLE_ENTRY_PENDING_DEL;
     /*
      * For non RoCE protocol, GID entry slot is ready to use.
      */
     if (!rdma_protocol_roce(ib_dev, port))
         table->data_vec[ix] = NULL;
     write_unlock_irq(&table->rwlock);
 
     ndev_storage = entry->ndev_storage;
     if (ndev_storage) {
         entry->ndev_storage = NULL;
         rcu_assign_pointer(entry->attr.ndev, NULL);
         call_rcu(&ndev_storage->rcu_head, put_gid_ndev);
     }
 
     if (rdma_cap_roce_gid_table(ib_dev, port))
         ib_dev->ops.del_gid(&entry->attr, &entry->context);
 
     put_gid_entry_locked(entry);
 }
 
 /**
  * add_modify_gid - Add or modify GID table entry
  *
  * @table:  GID table in which GID to be added or modified
  * @attr:   Attributes of the GID
  *
  * Returns 0 on success or appropriate error code. It accepts zero
  * GID addition for non RoCE ports for HCA's who report them as valid
  * GID. However such zero GIDs are not added to the cache.
  */
 static int add_modify_gid(struct ib_gid_table *table,
               const struct ib_gid_attr *attr)
 {
     struct ib_gid_table_entry *entry;
     int ret = 0;
 
     /*
      * Invalidate any old entry in the table to make it safe to write to
      * this index.
      */
     if (is_gid_entry_valid(table->data_vec[attr->index]))
         del_gid(attr->device, attr->port_num, table, attr->index);
 
     /*
      * Some HCA's report multiple GID entries with only one valid GID, and
      * leave other unused entries as the zero GID. Convert zero GIDs to
      * empty table entries instead of storing them.
      */
     if (rdma_is_zero_gid(&attr->gid))
         return 0;
 
     entry = alloc_gid_entry(attr);
     if (!entry)
         return -ENOMEM;
 
     if (rdma_protocol_roce(attr->device, attr->port_num)) {
         ret = add_roce_gid(entry);
         if (ret)
             goto done;
     }
 
     store_gid_entry(table, entry);
     return 0;
 
 done:
     put_gid_entry(entry);
     return ret;
 }
 
 /* rwlock should be read locked, or lock should be held */
 static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
             const struct ib_gid_attr *val, bool default_gid,
             unsigned long mask, int *pempty)
 {
     int i = 0;
     int found = -1;
     int empty = pempty ? -1 : 0;
 
     while (i < table->sz && (found < 0 || empty < 0)) {
         struct ib_gid_table_entry *data = table->data_vec[i];
         struct ib_gid_attr *attr;
         int curr_index = i;
 
         i++;
 
         /* find_gid() is used during GID addition where it is expected
          * to return a free entry slot which is not duplicate.
          * Free entry slot is requested and returned if pempty is set,
          * so lookup free slot only if requested.
          */
         if (pempty && empty < 0) {
             if (is_gid_entry_free(data) &&
                 default_gid ==
                 is_gid_index_default(table, curr_index)) {
                 /*
                  * Found an invalid (free) entry; allocate it.
                  * If default GID is requested, then our
                  * found slot must be one of the DEFAULT
                  * reserved slots or we fail.
                  * This ensures that only DEFAULT reserved
                  * slots are used for default property GIDs.
                  */
                 empty = curr_index;
             }
         }
 
         /*
          * Additionally find_gid() is used to find valid entry during
          * lookup operation; so ignore the entries which are marked as
          * pending for removal and the entries which are marked as
          * invalid.
          */
         if (!is_gid_entry_valid(data))
             continue;
 
         if (found >= 0)
             continue;
 
         attr = &data->attr;
         if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
             attr->gid_type != val->gid_type)
             continue;
 
         if (mask & GID_ATTR_FIND_MASK_GID &&
             memcmp(gid, &data->attr.gid, sizeof(*gid)))
             continue;
 
         if (mask & GID_ATTR_FIND_MASK_NETDEV &&
             attr->ndev != val->ndev)
             continue;
 
         if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
             is_gid_index_default(table, curr_index) != default_gid)
             continue;
 
         found = curr_index;
     }
 
     if (pempty)
         *pempty = empty;
 
     return found;
 }
 
 static void make_default_gid(struct  net_device *dev, union ib_gid *gid)
 {
     gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
     addrconf_ifid_eui48(&gid->raw[8], dev);
 }
 
 static int __ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
                   union ib_gid *gid, struct ib_gid_attr *attr,
                   unsigned long mask, bool default_gid)
 {
     struct ib_gid_table *table;
     int ret = 0;
     int empty;
     int ix;
 
     /* Do not allow adding zero GID in support of
      * IB spec version 1.3 section 4.1.1 point (6) and
      * section 12.7.10 and section 12.7.20
      */
     if (rdma_is_zero_gid(gid))
         return -EINVAL;
 
     table = rdma_gid_table(ib_dev, port);
 
     mutex_lock(&table->lock);
 
     ix = find_gid(table, gid, attr, default_gid, mask, &empty);
     if (ix >= 0)
         goto out_unlock;
 
     if (empty < 0) {
         ret = -ENOSPC;
         goto out_unlock;
     }
     attr->device = ib_dev;
     attr->index = empty;
     attr->port_num = port;
     attr->gid = *gid;
     ret = add_modify_gid(table, attr);
     if (!ret)
         dispatch_gid_change_event(ib_dev, port);
 
 out_unlock:
     mutex_unlock(&table->lock);
     if (ret)
         pr_warn("%s: unable to add gid %pI6 error=%d\n",
             __func__, gid->raw, ret);
     return ret;
 }
 
 int ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
              union ib_gid *gid, struct ib_gid_attr *attr)
 {
     unsigned long mask = GID_ATTR_FIND_MASK_GID |
                  GID_ATTR_FIND_MASK_GID_TYPE |
                  GID_ATTR_FIND_MASK_NETDEV;
 
     return __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
 }
 
 static int
 _ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
           union ib_gid *gid, struct ib_gid_attr *attr,
           unsigned long mask, bool default_gid)
 {
     struct ib_gid_table *table;
     int ret = 0;
     int ix;
 
     table = rdma_gid_table(ib_dev, port);
 
     mutex_lock(&table->lock);
 
     ix = find_gid(table, gid, attr, default_gid, mask, NULL);
     if (ix < 0) {
         ret = -EINVAL;
         goto out_unlock;
     }
 
     del_gid(ib_dev, port, table, ix);
     dispatch_gid_change_event(ib_dev, port);
 
 out_unlock:
     mutex_unlock(&table->lock);
     if (ret)
         pr_debug("%s: can't delete gid %pI6 error=%d\n",
              __func__, gid->raw, ret);
     return ret;
 }
 
 int ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
              union ib_gid *gid, struct ib_gid_attr *attr)
 {
     unsigned long mask = GID_ATTR_FIND_MASK_GID   |
                  GID_ATTR_FIND_MASK_GID_TYPE |
                  GID_ATTR_FIND_MASK_DEFAULT  |
                  GID_ATTR_FIND_MASK_NETDEV;
 
     return _ib_cache_gid_del(ib_dev, port, gid, attr, mask, false);
 }
 
 int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u32 port,
                      struct net_device *ndev)
 {
     struct ib_gid_table *table;
     int ix;
     bool deleted = false;
 
     table = rdma_gid_table(ib_dev, port);
 
     mutex_lock(&table->lock);
 
     for (ix = 0; ix < table->sz; ix++) {
         if (is_gid_entry_valid(table->data_vec[ix]) &&
             table->data_vec[ix]->attr.ndev == ndev) {
             del_gid(ib_dev, port, table, ix);
             deleted = true;
         }
     }
 
     mutex_unlock(&table->lock);
 
     if (deleted)
         dispatch_gid_change_event(ib_dev, port);
 
     return 0;
 }
 
 /**
  * rdma_find_gid_by_port - Returns the GID entry attributes when it finds
  * a valid GID entry for given search parameters. It searches for the specified
  * GID value in the local software cache.
  * @ib_dev: The device to query.
  * @gid: The GID value to search for.
  * @gid_type: The GID type to search for.
  * @port: The port number of the device where the GID value should be searched.
  * @ndev: In RoCE, the net device of the device. NULL means ignore.
  *
  * Returns sgid attributes if the GID is found with valid reference or
  * returns ERR_PTR for the error.
  * The caller must invoke rdma_put_gid_attr() to release the reference.
  */
 const struct ib_gid_attr *
 rdma_find_gid_by_port(struct ib_device *ib_dev,
               const union ib_gid *gid,
               enum ib_gid_type gid_type,
               u32 port, struct net_device *ndev)
 {
     int local_index;
     struct ib_gid_table *table;
     unsigned long mask = GID_ATTR_FIND_MASK_GID |
                  GID_ATTR_FIND_MASK_GID_TYPE;
     struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
     const struct ib_gid_attr *attr;
     unsigned long flags;
 
     if (!rdma_is_port_valid(ib_dev, port))
         return ERR_PTR(-ENOENT);
 
     table = rdma_gid_table(ib_dev, port);
 
     if (ndev)
         mask |= GID_ATTR_FIND_MASK_NETDEV;
 
     read_lock_irqsave(&table->rwlock, flags);
     local_index = find_gid(table, gid, &val, false, mask, NULL);
     if (local_index >= 0) {
         get_gid_entry(table->data_vec[local_index]);
         attr = &table->data_vec[local_index]->attr;
         read_unlock_irqrestore(&table->rwlock, flags);
         return attr;
     }
 
     read_unlock_irqrestore(&table->rwlock, flags);
     return ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL(rdma_find_gid_by_port);
 
 /**
  * rdma_find_gid_by_filter - Returns the GID table attribute where a
  * specified GID value occurs
  * @ib_dev: The device to query.
  * @gid: The GID value to search for.
  * @port: The port number of the device where the GID value could be
  *   searched.
  * @filter: The filter function is executed on any matching GID in the table.
  *   If the filter function returns true, the corresponding index is returned,
  *   otherwise, we continue searching the GID table. It's guaranteed that
  *   while filter is executed, ndev field is valid and the structure won't
  *   change. filter is executed in an atomic context. filter must not be NULL.
  * @context: Private data to pass into the call-back.
  *
  * rdma_find_gid_by_filter() searches for the specified GID value
  * of which the filter function returns true in the port's GID table.
  *
  */
 const struct ib_gid_attr *rdma_find_gid_by_filter(
     struct ib_device *ib_dev, const union ib_gid *gid, u32 port,
     bool (*filter)(const union ib_gid *gid, const struct ib_gid_attr *,
                void *),
     void *context)
 {
     const struct ib_gid_attr *res = ERR_PTR(-ENOENT);
     struct ib_gid_table *table;
     unsigned long flags;
     unsigned int i;
 
     if (!rdma_is_port_valid(ib_dev, port))
         return ERR_PTR(-EINVAL);
 
     table = rdma_gid_table(ib_dev, port);
 
     read_lock_irqsave(&table->rwlock, flags);
     for (i = 0; i < table->sz; i++) {
         struct ib_gid_table_entry *entry = table->data_vec[i];
 
         if (!is_gid_entry_valid(entry))
             continue;
 
         if (memcmp(gid, &entry->attr.gid, sizeof(*gid)))
             continue;
 
         if (filter(gid, &entry->attr, context)) {
             get_gid_entry(entry);
             res = &entry->attr;
             break;
         }
     }
     read_unlock_irqrestore(&table->rwlock, flags);
     return res;
 }
 
 static struct ib_gid_table *alloc_gid_table(int sz)
 {
     struct ib_gid_table *table = kzalloc(sizeof(*table), GFP_KERNEL);
 
     if (!table)
         return NULL;
 
     table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
     if (!table->data_vec)
         goto err_free_table;
 
     mutex_init(&table->lock);
 
     table->sz = sz;
     rwlock_init(&table->rwlock);
     return table;
 
 err_free_table:
     kfree(table);
     return NULL;
 }
 
 static void release_gid_table(struct ib_device *device,
                   struct ib_gid_table *table)
 {
     bool leak = false;
     int i;
 
     if (!table)
         return;
 
     for (i = 0; i < table->sz; i++) {
         if (is_gid_entry_free(table->data_vec[i]))
             continue;
         if (kref_read(&table->data_vec[i]->kref) > 1) {
             dev_err(&device->dev,
                 "GID entry ref leak for index %d ref=%u\n", i,
                 kref_read(&table->data_vec[i]->kref));
             leak = true;
         }
     }
     if (leak)
         return;
 
     mutex_destroy(&table->lock);
     kfree(table->data_vec);
     kfree(table);
 }
 
 static void cleanup_gid_table_port(struct ib_device *ib_dev, u32 port,
                    struct ib_gid_table *table)
 {
     int i;
 
     if (!table)
         return;
 
     mutex_lock(&table->lock);
     for (i = 0; i < table->sz; ++i) {
         if (is_gid_entry_valid(table->data_vec[i]))
             del_gid(ib_dev, port, table, i);
     }
     mutex_unlock(&table->lock);
 }
 
 void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u32 port,
                   struct net_device *ndev,
                   unsigned long gid_type_mask,
                   enum ib_cache_gid_default_mode mode)
 {
     union ib_gid gid = { };
     struct ib_gid_attr gid_attr;
     unsigned int gid_type;
     unsigned long mask;
 
     mask = GID_ATTR_FIND_MASK_GID_TYPE |
            GID_ATTR_FIND_MASK_DEFAULT |
            GID_ATTR_FIND_MASK_NETDEV;
     memset(&gid_attr, 0, sizeof(gid_attr));
     gid_attr.ndev = ndev;
 
     for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
         if (1UL << gid_type & ~gid_type_mask)
             continue;
 
         gid_attr.gid_type = gid_type;
 
         if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
             make_default_gid(ndev, &gid);
             __ib_cache_gid_add(ib_dev, port, &gid,
                        &gid_attr, mask, true);
         } else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
             _ib_cache_gid_del(ib_dev, port, &gid,
                       &gid_attr, mask, true);
         }
     }
 }
 
 static void gid_table_reserve_default(struct ib_device *ib_dev, u32 port,
                       struct ib_gid_table *table)
 {
     unsigned int i;
     unsigned long roce_gid_type_mask;
     unsigned int num_default_gids;
 
     roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
     num_default_gids = hweight_long(roce_gid_type_mask);
     /* Reserve starting indices for default GIDs */
     for (i = 0; i < num_default_gids && i < table->sz; i++)
         table->default_gid_indices |= BIT(i);
 }
 
 
 static void gid_table_release_one(struct ib_device *ib_dev)
 {
     u32 p;
 
     rdma_for_each_port (ib_dev, p) {
         release_gid_table(ib_dev, ib_dev->port_data[p].cache.gid);
         ib_dev->port_data[p].cache.gid = NULL;
     }
 }
 
 static int _gid_table_setup_one(struct ib_device *ib_dev)
 {
     struct ib_gid_table *table;
     u32 rdma_port;
 
     rdma_for_each_port (ib_dev, rdma_port) {
         table = alloc_gid_table(
             ib_dev->port_data[rdma_port].immutable.gid_tbl_len);
         if (!table)
             goto rollback_table_setup;
 
         gid_table_reserve_default(ib_dev, rdma_port, table);
         ib_dev->port_data[rdma_port].cache.gid = table;
     }
     return 0;
 
 rollback_table_setup:
     gid_table_release_one(ib_dev);
     return -ENOMEM;
 }
 
 static void gid_table_cleanup_one(struct ib_device *ib_dev)
 {
     u32 p;
 
     rdma_for_each_port (ib_dev, p)
         cleanup_gid_table_port(ib_dev, p,
                        ib_dev->port_data[p].cache.gid);
 }
 
 static int gid_table_setup_one(struct ib_device *ib_dev)
 {
     int err;
 
     err = _gid_table_setup_one(ib_dev);
 
     if (err)
         return err;
 
     rdma_roce_rescan_device(ib_dev);
 
     return err;
 }
 
 /**
  * rdma_query_gid - Read the GID content from the GID software cache
  * @device:     Device to query the GID
  * @port_num:       Port number of the device
  * @index:      Index of the GID table entry to read
  * @gid:        Pointer to GID where to store the entry's GID
  *
  * rdma_query_gid() only reads the GID entry content for requested device,
  * port and index. It reads for IB, RoCE and iWarp link layers.  It doesn't
  * hold any reference to the GID table entry in the HCA or software cache.
  *
  * Returns 0 on success or appropriate error code.
  *
  */
 int rdma_query_gid(struct ib_device *device, u32 port_num,
            int index, union ib_gid *gid)
 {
     struct ib_gid_table *table;
     unsigned long flags;
     int res;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     table = rdma_gid_table(device, port_num);
     read_lock_irqsave(&table->rwlock, flags);
 
     if (index < 0 || index >= table->sz) {
         res = -EINVAL;
         goto done;
     }
 
     if (!is_gid_entry_valid(table->data_vec[index])) {
         res = -ENOENT;
         goto done;
     }
 
     memcpy(gid, &table->data_vec[index]->attr.gid, sizeof(*gid));
     res = 0;
 
 done:
     read_unlock_irqrestore(&table->rwlock, flags);
     return res;
 }
 EXPORT_SYMBOL(rdma_query_gid);
 
 /**
  * rdma_read_gid_hw_context - Read the HW GID context from GID attribute
  * @attr:       Potinter to the GID attribute
  *
  * rdma_read_gid_hw_context() reads the drivers GID HW context corresponding
  * to the SGID attr. Callers are required to already be holding the reference
  * to an existing GID entry.
  *
  * Returns the HW GID context
  *
  */
 void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr)
 {
     return container_of(attr, struct ib_gid_table_entry, attr)->context;
 }
 EXPORT_SYMBOL(rdma_read_gid_hw_context);
 
 /**
  * rdma_find_gid - Returns SGID attributes if the matching GID is found.
  * @device: The device to query.
  * @gid: The GID value to search for.
  * @gid_type: The GID type to search for.
  * @ndev: In RoCE, the net device of the device. NULL means ignore.
  *
  * rdma_find_gid() searches for the specified GID value in the software cache.
  *
  * Returns GID attributes if a valid GID is found or returns ERR_PTR for the
  * error. The caller must invoke rdma_put_gid_attr() to release the reference.
  *
  */
 const struct ib_gid_attr *rdma_find_gid(struct ib_device *device,
                     const union ib_gid *gid,
                     enum ib_gid_type gid_type,
                     struct net_device *ndev)
 {
     unsigned long mask = GID_ATTR_FIND_MASK_GID |
                  GID_ATTR_FIND_MASK_GID_TYPE;
     struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};
     u32 p;
 
     if (ndev)
         mask |= GID_ATTR_FIND_MASK_NETDEV;
 
     rdma_for_each_port(device, p) {
         struct ib_gid_table *table;
         unsigned long flags;
         int index;
 
         table = device->port_data[p].cache.gid;
         read_lock_irqsave(&table->rwlock, flags);
         index = find_gid(table, gid, &gid_attr_val, false, mask, NULL);
         if (index >= 0) {
             const struct ib_gid_attr *attr;
 
             get_gid_entry(table->data_vec[index]);
             attr = &table->data_vec[index]->attr;
             read_unlock_irqrestore(&table->rwlock, flags);
             return attr;
         }
         read_unlock_irqrestore(&table->rwlock, flags);
     }
 
     return ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL(rdma_find_gid);
 
 int ib_get_cached_pkey(struct ib_device *device,
                u32               port_num,
                int               index,
                u16              *pkey)
 {
     struct ib_pkey_cache *cache;
     unsigned long flags;
     int ret = 0;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     read_lock_irqsave(&device->cache_lock, flags);
 
     cache = device->port_data[port_num].cache.pkey;
 
     if (!cache || index < 0 || index >= cache->table_len)
         ret = -EINVAL;
     else
         *pkey = cache->table[index];
 
     read_unlock_irqrestore(&device->cache_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(ib_get_cached_pkey);
 
 void ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
                 u64 *sn_pfx)
 {
     unsigned long flags;
 
     read_lock_irqsave(&device->cache_lock, flags);
     *sn_pfx = device->port_data[port_num].cache.subnet_prefix;
     read_unlock_irqrestore(&device->cache_lock, flags);
 }
 EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
 
 int ib_find_cached_pkey(struct ib_device *device, u32 port_num,
             u16 pkey, u16 *index)
 {
     struct ib_pkey_cache *cache;
     unsigned long flags;
     int i;
     int ret = -ENOENT;
     int partial_ix = -1;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     read_lock_irqsave(&device->cache_lock, flags);
 
     cache = device->port_data[port_num].cache.pkey;
     if (!cache) {
         ret = -EINVAL;
         goto err;
     }
 
     *index = -1;
 
     for (i = 0; i < cache->table_len; ++i)
         if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
             if (cache->table[i] & 0x8000) {
                 *index = i;
                 ret = 0;
                 break;
             } else {
                 partial_ix = i;
             }
         }
 
     if (ret && partial_ix >= 0) {
         *index = partial_ix;
         ret = 0;
     }
 
 err:
     read_unlock_irqrestore(&device->cache_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(ib_find_cached_pkey);
 
 int ib_find_exact_cached_pkey(struct ib_device *device, u32 port_num,
                   u16 pkey, u16 *index)
 {
     struct ib_pkey_cache *cache;
     unsigned long flags;
     int i;
     int ret = -ENOENT;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     read_lock_irqsave(&device->cache_lock, flags);
 
     cache = device->port_data[port_num].cache.pkey;
     if (!cache) {
         ret = -EINVAL;
         goto err;
     }
 
     *index = -1;
 
     for (i = 0; i < cache->table_len; ++i)
         if (cache->table[i] == pkey) {
             *index = i;
             ret = 0;
             break;
         }
 
 err:
     read_unlock_irqrestore(&device->cache_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(ib_find_exact_cached_pkey);
 
 int ib_get_cached_lmc(struct ib_device *device, u32 port_num, u8 *lmc)
 {
     unsigned long flags;
     int ret = 0;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     read_lock_irqsave(&device->cache_lock, flags);
     *lmc = device->port_data[port_num].cache.lmc;
     read_unlock_irqrestore(&device->cache_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(ib_get_cached_lmc);
 
 int ib_get_cached_port_state(struct ib_device *device, u32 port_num,
                  enum ib_port_state *port_state)
 {
     unsigned long flags;
     int ret = 0;
 
     if (!rdma_is_port_valid(device, port_num))
         return -EINVAL;
 
     read_lock_irqsave(&device->cache_lock, flags);
     *port_state = device->port_data[port_num].cache.port_state;
     read_unlock_irqrestore(&device->cache_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(ib_get_cached_port_state);
 
 /**
  * rdma_get_gid_attr - Returns GID attributes for a port of a device
  * at a requested gid_index, if a valid GID entry exists.
  * @device:     The device to query.
  * @port_num:       The port number on the device where the GID value
  *          is to be queried.
  * @index:      Index of the GID table entry whose attributes are to
  *                      be queried.
  *
  * rdma_get_gid_attr() acquires reference count of gid attributes from the
  * cached GID table. Caller must invoke rdma_put_gid_attr() to release
  * reference to gid attribute regardless of link layer.
  *
  * Returns pointer to valid gid attribute or ERR_PTR for the appropriate error
  * code.
  */
 const struct ib_gid_attr *
 rdma_get_gid_attr(struct ib_device *device, u32 port_num, int index)
 {
     const struct ib_gid_attr *attr = ERR_PTR(-ENODATA);
     struct ib_gid_table *table;
     unsigned long flags;
 
     if (!rdma_is_port_valid(device, port_num))
         return ERR_PTR(-EINVAL);
 
     table = rdma_gid_table(device, port_num);
     if (index < 0 || index >= table->sz)
         return ERR_PTR(-EINVAL);
 
     read_lock_irqsave(&table->rwlock, flags);
     if (!is_gid_entry_valid(table->data_vec[index]))
         goto done;
 
     get_gid_entry(table->data_vec[index]);
     attr = &table->data_vec[index]->attr;
 done:
     read_unlock_irqrestore(&table->rwlock, flags);
     return attr;
 }
 EXPORT_SYMBOL(rdma_get_gid_attr);
 
 /**
  * rdma_query_gid_table - Reads GID table entries of all the ports of a device up to max_entries.
  * @device: The device to query.
  * @entries: Entries where GID entries are returned.
  * @max_entries: Maximum number of entries that can be returned.
  * Entries array must be allocated to hold max_entries number of entries.
  *
  * Returns number of entries on success or appropriate error code.
  */
 ssize_t rdma_query_gid_table(struct ib_device *device,
                  struct ib_uverbs_gid_entry *entries,
                  size_t max_entries)
 {
     const struct ib_gid_attr *gid_attr;
     ssize_t num_entries = 0, ret;
     struct ib_gid_table *table;
     u32 port_num, i;
     struct net_device *ndev;
     unsigned long flags;
 
     rdma_for_each_port(device, port_num) {
         table = rdma_gid_table(device, port_num);
         read_lock_irqsave(&table->rwlock, flags);
         for (i = 0; i < table->sz; i++) {
             if (!is_gid_entry_valid(table->data_vec[i]))
                 continue;
             if (num_entries >= max_entries) {
                 ret = -EINVAL;
                 goto err;
             }
 
             gid_attr = &table->data_vec[i]->attr;
 
             memcpy(&entries->gid, &gid_attr->gid,
                    sizeof(gid_attr->gid));
             entries->gid_index = gid_attr->index;
             entries->port_num = gid_attr->port_num;
             entries->gid_type = gid_attr->gid_type;
             ndev = rcu_dereference_protected(
                 gid_attr->ndev,
                 lockdep_is_held(&table->rwlock));
             if (ndev)
                 entries->netdev_ifindex = ndev->ifindex;
 
             num_entries++;
             entries++;
         }
         read_unlock_irqrestore(&table->rwlock, flags);
     }
 
     return num_entries;
 err:
     read_unlock_irqrestore(&table->rwlock, flags);
     return ret;
 }
 EXPORT_SYMBOL(rdma_query_gid_table);
 
 /**
  * rdma_put_gid_attr - Release reference to the GID attribute
  * @attr:       Pointer to the GID attribute whose reference
  *          needs to be released.
  *
  * rdma_put_gid_attr() must be used to release reference whose
  * reference is acquired using rdma_get_gid_attr() or any APIs
  * which returns a pointer to the ib_gid_attr regardless of link layer
  * of IB or RoCE.
  *
  */
 void rdma_put_gid_attr(const struct ib_gid_attr *attr)
 {
     struct ib_gid_table_entry *entry =
         container_of(attr, struct ib_gid_table_entry, attr);
 
     put_gid_entry(entry);
 }
 EXPORT_SYMBOL(rdma_put_gid_attr);
 
 /**
  * rdma_hold_gid_attr - Get reference to existing GID attribute
  *
  * @attr:       Pointer to the GID attribute whose reference
  *          needs to be taken.
  *
  * Increase the reference count to a GID attribute to keep it from being
  * freed. Callers are required to already be holding a reference to attribute.
  *
  */
 void rdma_hold_gid_attr(const struct ib_gid_attr *attr)
 {
     struct ib_gid_table_entry *entry =
         container_of(attr, struct ib_gid_table_entry, attr);
 
     get_gid_entry(entry);
 }
 EXPORT_SYMBOL(rdma_hold_gid_attr);
 
 /**
  * rdma_read_gid_attr_ndev_rcu - Read GID attribute netdevice
  * which must be in UP state.
  *
  * @attr:Pointer to the GID attribute
  *
  * Returns pointer to netdevice if the netdevice was attached to GID and
  * netdevice is in UP state. Caller must hold RCU lock as this API
  * reads the netdev flags which can change while netdevice migrates to
  * different net namespace. Returns ERR_PTR with error code otherwise.
  *
  */
 struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr)
 {
     struct ib_gid_table_entry *entry =
             container_of(attr, struct ib_gid_table_entry, attr);
     struct ib_device *device = entry->attr.device;
     struct net_device *ndev = ERR_PTR(-EINVAL);
     u32 port_num = entry->attr.port_num;
     struct ib_gid_table *table;
     unsigned long flags;
     bool valid;
 
     table = rdma_gid_table(device, port_num);
 
     read_lock_irqsave(&table->rwlock, flags);
     valid = is_gid_entry_valid(table->data_vec[attr->index]);
     if (valid) {
         ndev = rcu_dereference(attr->ndev);
         if (!ndev)
             ndev = ERR_PTR(-ENODEV);
     }
     read_unlock_irqrestore(&table->rwlock, flags);
     return ndev;
 }
 EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu);
 
 static int get_lower_dev_vlan(struct net_device *lower_dev,
                   struct netdev_nested_priv *priv)
 {
     u16 *vlan_id = (u16 *)priv->data;
 
     if (is_vlan_dev(lower_dev))
         *vlan_id = vlan_dev_vlan_id(lower_dev);
 
     /* We are interested only in first level vlan device, so
      * always return 1 to stop iterating over next level devices.
      */
     return 1;
 }
 
 /**
  * rdma_read_gid_l2_fields - Read the vlan ID and source MAC address
  *               of a GID entry.
  *
  * @attr:   GID attribute pointer whose L2 fields to be read
  * @vlan_id:    Pointer to vlan id to fill up if the GID entry has
  *      vlan id. It is optional.
  * @smac:   Pointer to smac to fill up for a GID entry. It is optional.
  *
  * rdma_read_gid_l2_fields() returns 0 on success and returns vlan id
  * (if gid entry has vlan) and source MAC, or returns error.
  */
 int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr,
                 u16 *vlan_id, u8 *smac)
 {
     struct netdev_nested_priv priv = {
         .data = (void *)vlan_id,
     };
     struct net_device *ndev;
 
     rcu_read_lock();
     ndev = rcu_dereference(attr->ndev);
     if (!ndev) {
         rcu_read_unlock();
         return -ENODEV;
     }
     if (smac)
         ether_addr_copy(smac, ndev->dev_addr);
     if (vlan_id) {
         *vlan_id = 0xffff;
         if (is_vlan_dev(ndev)) {
             *vlan_id = vlan_dev_vlan_id(ndev);
         } else {
             /* If the netdev is upper device and if it's lower
              * device is vlan device, consider vlan id of the
              * the lower vlan device for this gid entry.
              */
             netdev_walk_all_lower_dev_rcu(attr->ndev,
                     get_lower_dev_vlan, &priv);
         }
     }
     rcu_read_unlock();
     return 0;
 }
 EXPORT_SYMBOL(rdma_read_gid_l2_fields);
 
 static int config_non_roce_gid_cache(struct ib_device *device,
                      u32 port, struct ib_port_attr *tprops)
 {
     struct ib_gid_attr gid_attr = {};
     struct ib_gid_table *table;
     int ret = 0;
     int i;
 
     gid_attr.device = device;
     gid_attr.port_num = port;
     table = rdma_gid_table(device, port);
 
     mutex_lock(&table->lock);
     for (i = 0; i < tprops->gid_tbl_len; ++i) {
         if (!device->ops.query_gid)
             continue;
         ret = device->ops.query_gid(device, port, i, &gid_attr.gid);
         if (ret) {
             dev_warn(&device->dev,
                  "query_gid failed (%d) for index %d\n", ret,
                  i);
             goto err;
         }
         gid_attr.index = i;
         tprops->subnet_prefix =
             be64_to_cpu(gid_attr.gid.global.subnet_prefix);
         add_modify_gid(table, &gid_attr);
     }
 err:
     mutex_unlock(&table->lock);
     return ret;
 }
 
 static int
 ib_cache_update(struct ib_device *device, u32 port, bool update_gids,
         bool update_pkeys, bool enforce_security)
 {
     struct ib_port_attr       *tprops = NULL;
     struct ib_pkey_cache      *pkey_cache = NULL;
     struct ib_pkey_cache      *old_pkey_cache = NULL;
     int                        i;
     int                        ret;
 
     if (!rdma_is_port_valid(device, port))
         return -EINVAL;
 
     tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
     if (!tprops)
         return -ENOMEM;
 
     ret = ib_query_port(device, port, tprops);
     if (ret) {
         dev_warn(&device->dev, "ib_query_port failed (%d)\n", ret);
         goto err;
     }
 
     if (!rdma_protocol_roce(device, port) && update_gids) {
         ret = config_non_roce_gid_cache(device, port,
                         tprops);
         if (ret)
             goto err;
     }
 
     update_pkeys &= !!tprops->pkey_tbl_len;
 
     if (update_pkeys) {
         pkey_cache = kmalloc(struct_size(pkey_cache, table,
                          tprops->pkey_tbl_len),
                      GFP_KERNEL);
         if (!pkey_cache) {
             ret = -ENOMEM;
             goto err;
         }
 
         pkey_cache->table_len = tprops->pkey_tbl_len;
 
         for (i = 0; i < pkey_cache->table_len; ++i) {
             ret = ib_query_pkey(device, port, i,
                         pkey_cache->table + i);
             if (ret) {
                 dev_warn(&device->dev,
                      "ib_query_pkey failed (%d) for index %d\n",
                      ret, i);
                 goto err;
             }
         }
     }
 
     write_lock_irq(&device->cache_lock);
 
     if (update_pkeys) {
         old_pkey_cache = device->port_data[port].cache.pkey;
         device->port_data[port].cache.pkey = pkey_cache;
     }
     device->port_data[port].cache.lmc = tprops->lmc;
     device->port_data[port].cache.port_state = tprops->state;
 
     device->port_data[port].cache.subnet_prefix = tprops->subnet_prefix;
     write_unlock_irq(&device->cache_lock);
 
     if (enforce_security)
         ib_security_cache_change(device,
                      port,
                      tprops->subnet_prefix);
 
     kfree(old_pkey_cache);
     kfree(tprops);
     return 0;
 
 err:
     kfree(pkey_cache);
     kfree(tprops);
     return ret;
 }
 
 static void ib_cache_event_task(struct work_struct *_work)
 {
     struct ib_update_work *work =
         container_of(_work, struct ib_update_work, work);
     int ret;
 
     /* Before distributing the cache update event, first sync
      * the cache.
      */
     ret = ib_cache_update(work->event.device, work->event.element.port_num,
                   work->event.event == IB_EVENT_GID_CHANGE,
                   work->event.event == IB_EVENT_PKEY_CHANGE,
                   work->enforce_security);
 
     /* GID event is notified already for individual GID entries by
      * dispatch_gid_change_event(). Hence, notifiy for rest of the
      * events.
      */
     if (!ret && work->event.event != IB_EVENT_GID_CHANGE)
         ib_dispatch_event_clients(&work->event);
 
     kfree(work);
 }
 
 static void ib_generic_event_task(struct work_struct *_work)
 {
     struct ib_update_work *work =
         container_of(_work, struct ib_update_work, work);
 
     ib_dispatch_event_clients(&work->event);
     kfree(work);
 }
 
 static bool is_cache_update_event(const struct ib_event *event)
 {
     return (event->event == IB_EVENT_PORT_ERR    ||
         event->event == IB_EVENT_PORT_ACTIVE ||
         event->event == IB_EVENT_LID_CHANGE  ||
         event->event == IB_EVENT_PKEY_CHANGE ||
         event->event == IB_EVENT_CLIENT_REREGISTER ||
         event->event == IB_EVENT_GID_CHANGE);
 }
 
 /**
  * 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(const struct ib_event *event)
 {
     struct ib_update_work *work;
 
     work = kzalloc(sizeof(*work), GFP_ATOMIC);
     if (!work)
         return;
 
     if (is_cache_update_event(event))
         INIT_WORK(&work->work, ib_cache_event_task);
     else
         INIT_WORK(&work->work, ib_generic_event_task);
 
     work->event = *event;
     if (event->event == IB_EVENT_PKEY_CHANGE ||
         event->event == IB_EVENT_GID_CHANGE)
         work->enforce_security = true;
 
     queue_work(ib_wq, &work->work);
 }
 EXPORT_SYMBOL(ib_dispatch_event);
 
 int ib_cache_setup_one(struct ib_device *device)
 {
     u32 p;
     int err;
 
     err = gid_table_setup_one(device);
     if (err)
         return err;
 
     rdma_for_each_port (device, p) {
         err = ib_cache_update(device, p, true, true, true);
         if (err)
             return err;
     }
 
     return 0;
 }
 
 void ib_cache_release_one(struct ib_device *device)
 {
     u32 p;
 
     /*
      * The release function frees all the cache elements.
      * This function should be called as part of freeing
      * all the device's resources when the cache could no
      * longer be accessed.
      */
     rdma_for_each_port (device, p)
         kfree(device->port_data[p].cache.pkey);
 
     gid_table_release_one(device);
 }
 
 void ib_cache_cleanup_one(struct ib_device *device)
 {
     /* The cleanup function waits for all in-progress workqueue
      * elements and cleans up the GID cache. This function should be
      * called after the device was removed from the devices list and
      * all clients were removed, so the cache exists but is
      * non-functional and shouldn't be updated anymore.
      */
     flush_workqueue(ib_wq);
     gid_table_cleanup_one(device);
 
     /*
      * Flush the wq second time for any pending GID delete work.
      */
     flush_workqueue(ib_wq);
 }

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