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cache.c

/*
 * 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.
 *
 * $Id: cache.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include <rdma/ib_cache.h>

#include "core_priv.h"

struct ib_pkey_cache {
      int             table_len;
      u16             table[0];
};

struct ib_gid_cache {
      int             table_len;
      union ib_gid    table[0];
};

struct ib_update_work {
      struct work_struct work;
      struct ib_device  *device;
      u8                 port_num;
};

static inline int start_port(struct ib_device *device)
{
      return (device->node_type == RDMA_NODE_IB_SWITCH) ? 0 : 1;
}

static inline int end_port(struct ib_device *device)
{
      return (device->node_type == RDMA_NODE_IB_SWITCH) ?
            0 : device->phys_port_cnt;
}

int ib_get_cached_gid(struct ib_device *device,
                  u8                port_num,
                  int               index,
                  union ib_gid     *gid)
{
      struct ib_gid_cache *cache;
      unsigned long flags;
      int ret = 0;

      if (port_num < start_port(device) || port_num > end_port(device))
            return -EINVAL;

      read_lock_irqsave(&device->cache.lock, flags);

      cache = device->cache.gid_cache[port_num - start_port(device)];

      if (index < 0 || index >= cache->table_len)
            ret = -EINVAL;
      else
            *gid = cache->table[index];

      read_unlock_irqrestore(&device->cache.lock, flags);

      return ret;
}
EXPORT_SYMBOL(ib_get_cached_gid);

int ib_find_cached_gid(struct ib_device *device,
                   union ib_gid     *gid,
                   u8               *port_num,
                   u16              *index)
{
      struct ib_gid_cache *cache;
      unsigned long flags;
      int p, i;
      int ret = -ENOENT;

      *port_num = -1;
      if (index)
            *index = -1;

      read_lock_irqsave(&device->cache.lock, flags);

      for (p = 0; p <= end_port(device) - start_port(device); ++p) {
            cache = device->cache.gid_cache[p];
            for (i = 0; i < cache->table_len; ++i) {
                  if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
                        *port_num = p + start_port(device);
                        if (index)
                              *index = i;
                        ret = 0;
                        goto found;
                  }
            }
      }
found:
      read_unlock_irqrestore(&device->cache.lock, flags);

      return ret;
}
EXPORT_SYMBOL(ib_find_cached_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 (port_num < start_port(device) || port_num > end_port(device))
            return -EINVAL;

      read_lock_irqsave(&device->cache.lock, flags);

      cache = device->cache.pkey_cache[port_num - start_port(device)];

      if (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_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;

      if (port_num < start_port(device) || port_num > end_port(device))
            return -EINVAL;

      read_lock_irqsave(&device->cache.lock, flags);

      cache = device->cache.pkey_cache[port_num - start_port(device)];

      *index = -1;

      for (i = 0; i < cache->table_len; ++i)
            if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
                  *index = i;
                  ret = 0;
                  break;
            }

      read_unlock_irqrestore(&device->cache.lock, flags);

      return ret;
}
EXPORT_SYMBOL(ib_find_cached_pkey);

int ib_get_cached_lmc(struct ib_device *device,
                  u8                port_num,
                  u8                *lmc)
{
      unsigned long flags;
      int ret = 0;

      if (port_num < start_port(device) || port_num > end_port(device))
            return -EINVAL;

      read_lock_irqsave(&device->cache.lock, flags);
      *lmc = device->cache.lmc_cache[port_num - start_port(device)];
      read_unlock_irqrestore(&device->cache.lock, flags);

      return ret;
}
EXPORT_SYMBOL(ib_get_cached_lmc);

static void ib_cache_update(struct ib_device *device,
                      u8                port)
{
      struct ib_port_attr       *tprops = NULL;
      struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
      struct ib_gid_cache       *gid_cache = NULL, *old_gid_cache;
      int                        i;
      int                        ret;

      tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
      if (!tprops)
            return;

      ret = ib_query_port(device, port, tprops);
      if (ret) {
            printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
                   ret, device->name);
            goto err;
      }

      pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
                       sizeof *pkey_cache->table, GFP_KERNEL);
      if (!pkey_cache)
            goto err;

      pkey_cache->table_len = tprops->pkey_tbl_len;

      gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
                      sizeof *gid_cache->table, GFP_KERNEL);
      if (!gid_cache)
            goto err;

      gid_cache->table_len = tprops->gid_tbl_len;

      for (i = 0; i < pkey_cache->table_len; ++i) {
            ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
            if (ret) {
                  printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
                         ret, device->name, i);
                  goto err;
            }
      }

      for (i = 0; i < gid_cache->table_len; ++i) {
            ret = ib_query_gid(device, port, i, gid_cache->table + i);
            if (ret) {
                  printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
                         ret, device->name, i);
                  goto err;
            }
      }

      write_lock_irq(&device->cache.lock);

      old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
      old_gid_cache  = device->cache.gid_cache [port - start_port(device)];

      device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
      device->cache.gid_cache [port - start_port(device)] = gid_cache;

      device->cache.lmc_cache[port - start_port(device)] = tprops->lmc;

      write_unlock_irq(&device->cache.lock);

      kfree(old_pkey_cache);
      kfree(old_gid_cache);
      kfree(tprops);
      return;

err:
      kfree(pkey_cache);
      kfree(gid_cache);
      kfree(tprops);
}

static void ib_cache_task(struct work_struct *_work)
{
      struct ib_update_work *work =
            container_of(_work, struct ib_update_work, work);

      ib_cache_update(work->device, work->port_num);
      kfree(work);
}

static void ib_cache_event(struct ib_event_handler *handler,
                     struct ib_event *event)
{
      struct ib_update_work *work;

      if (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_SM_CHANGE   ||
          event->event == IB_EVENT_CLIENT_REREGISTER) {
            work = kmalloc(sizeof *work, GFP_ATOMIC);
            if (work) {
                  INIT_WORK(&work->work, ib_cache_task);
                  work->device   = event->device;
                  work->port_num = event->element.port_num;
                  schedule_work(&work->work);
            }
      }
}

static void ib_cache_setup_one(struct ib_device *device)
{
      int p;

      rwlock_init(&device->cache.lock);

      device->cache.pkey_cache =
            kmalloc(sizeof *device->cache.pkey_cache *
                  (end_port(device) - start_port(device) + 1), GFP_KERNEL);
      device->cache.gid_cache =
            kmalloc(sizeof *device->cache.gid_cache *
                  (end_port(device) - start_port(device) + 1), GFP_KERNEL);

      device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
                                (end_port(device) -
                                 start_port(device) + 1),
                                GFP_KERNEL);

      if (!device->cache.pkey_cache || !device->cache.gid_cache ||
          !device->cache.lmc_cache) {
            printk(KERN_WARNING "Couldn't allocate cache "
                   "for %s\n", device->name);
            goto err;
      }

      for (p = 0; p <= end_port(device) - start_port(device); ++p) {
            device->cache.pkey_cache[p] = NULL;
            device->cache.gid_cache [p] = NULL;
            ib_cache_update(device, p + start_port(device));
      }

      INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
                        device, ib_cache_event);
      if (ib_register_event_handler(&device->cache.event_handler))
            goto err_cache;

      return;

err_cache:
      for (p = 0; p <= end_port(device) - start_port(device); ++p) {
            kfree(device->cache.pkey_cache[p]);
            kfree(device->cache.gid_cache[p]);
      }

err:
      kfree(device->cache.pkey_cache);
      kfree(device->cache.gid_cache);
      kfree(device->cache.lmc_cache);
}

static void ib_cache_cleanup_one(struct ib_device *device)
{
      int p;

      ib_unregister_event_handler(&device->cache.event_handler);
      flush_scheduled_work();

      for (p = 0; p <= end_port(device) - start_port(device); ++p) {
            kfree(device->cache.pkey_cache[p]);
            kfree(device->cache.gid_cache[p]);
      }

      kfree(device->cache.pkey_cache);
      kfree(device->cache.gid_cache);
      kfree(device->cache.lmc_cache);
}

static struct ib_client cache_client = {
      .name   = "cache",
      .add    = ib_cache_setup_one,
      .remove = ib_cache_cleanup_one
};

int __init ib_cache_setup(void)
{
      return ib_register_client(&cache_client);
}

void __exit ib_cache_cleanup(void)
{
      ib_unregister_client(&cache_client);
}

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