Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1674 insertions, 0 deletions

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
new file mode 100644
index 000000000..4084d05a4
--- /dev/null
+++ b/drivers/infiniband/core/cache.c
@@ -0,0 +1,1674 @@
+/*
+ * 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);
+}