Orange Pi5 kernel

/*
 * 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/module.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, u8 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, u8 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;
<------>u8 port_num = entry->attr.port_num;
<------>struct ib_gid_table *table = rdma_gid_table(device, port_num);
 
<------>dev_dbg(&device->dev, "%s port=%d index=%d 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;
<------>u8 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=%d index=%d 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=%d index=%d\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=%d index=%d\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, u8 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=%d 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, u8 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, u8 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, u8 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, u8 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, u8 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.
 * @device: The device to query.
 * @gid: The GID value to search for.
 * @gid_type: The GID type to search for.
 * @port_num: 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,
<------><------>      u8 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
 * @device: 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.
 *
 * 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, u8 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=%d\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, u8 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, u8 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, u8 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)
{
<------>unsigned int 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;
<------>unsigned int 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)
{
<------>unsigned int 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, u8 port_num,
<------><------>   int index, union ib_gid *gid)
{
<------>struct ib_gid_table *table;
<------>unsigned long flags;
<------>int res = -EINVAL;
 
<------>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 ||
<------>    !is_gid_entry_valid(table->data_vec[index]))
<------><------>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};
<------>unsigned int 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,
<------><------>       u8                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);
 
int ib_get_cached_subnet_prefix(struct ib_device *device,
<------><------><------><------>u8                port_num,
<------><------><------><------>u64              *sn_pfx)
{
<------>unsigned long flags;
 
<------>if (!rdma_is_port_valid(device, port_num))
<------><------>return -EINVAL;
 
<------>read_lock_irqsave(&device->cache_lock, flags);
<------>*sn_pfx = device->port_data[port_num].cache.subnet_prefix;
<------>read_unlock_irqrestore(&device->cache_lock, flags);
 
<------>return 0;
}
EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
 
int ib_find_cached_pkey(struct ib_device *device,
<------><------><------>u8                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,
<------><------><------>      u8                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,
<------><------>      u8                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,
<------><------><------>     u8                  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, u8 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.
 * @num_entries: Updated to the number of entries that were successfully read.
 *
 * 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;
<------>unsigned int 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);
<------>u8 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,
<------><------><------><------>     u8 port, int gid_tbl_len)
{
<------>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 < 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;
<------><------>add_modify_gid(table, &gid_attr);
<------>}
err:
<------>mutex_unlock(&table->lock);
<------>return ret;
}
 
static int
ib_cache_update(struct ib_device *device, u8 port, bool enforce_security)
{
<------>struct ib_port_attr       *tprops = NULL;
<------>struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
<------>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)) {
<------><------>ret = config_non_roce_gid_cache(device, port,
<------><------><------><------><------><------>tprops->gid_tbl_len);
<------><------>if (ret)
<------><------><------>goto err;
<------>}
 
<------>if (tprops->pkey_tbl_len) {
<------><------>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);
 
<------>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->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)
{
<------>unsigned int p;
<------>int err;
 
<------>rwlock_init(&device->cache_lock);
 
<------>err = gid_table_setup_one(device);
<------>if (err)
<------><------>return err;
 
<------>rdma_for_each_port (device, p) {
<------><------>err = ib_cache_update(device, p, true);
<------><------>if (err)
<------><------><------>return err;
<------>}
 
<------>return 0;
}
 
void ib_cache_release_one(struct ib_device *device)
{
<------>unsigned int 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);
}