drivers/infiniband/core/cache.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation. All rights reserved.
   4  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/errno.h>
  38 #include <linux/slab.h>
  39 #include <linux/workqueue.h>
  40
  41 #include <rdma/ib_cache.h>
  42
  43 #include "core_priv.h"
  44
  45 struct ib_pkey_cache {
  46         int             table_len;
  47         u16             table[0];
  48 };
  49
  50 struct ib_gid_cache {
  51         int             table_len;
  52         union ib_gid    table[0];
  53 };
  54
  55 struct ib_update_work {
  56         struct work_struct work;
  57         struct ib_device  *device;
  58         u8                 port_num;
  59 };
  60
  61 static inline int start_port(struct ib_device *device)
  62 {
  63         return (device->node_type == RDMA_NODE_IB_SWITCH) ? 0 : 1;
  64 }
  65
  66 static inline int end_port(struct ib_device *device)
  67 {
  68         return (device->node_type == RDMA_NODE_IB_SWITCH) ?
  69                 0 : device->phys_port_cnt;
  70 }
  71
  72 int ib_get_cached_gid(struct ib_device *device,
  73                       u8                port_num,
  74                       int               index,
  75                       union ib_gid     *gid)
  76 {
  77         struct ib_gid_cache *cache;
  78         unsigned long flags;
  79         int ret = 0;
  80
  81         if (port_num < start_port(device) || port_num > end_port(device))
  82                 return -EINVAL;
  83
  84         read_lock_irqsave(&device->cache.lock, flags);
  85
  86         cache = device->cache.gid_cache[port_num - start_port(device)];
  87
  88         if (index < 0 || index >= cache->table_len)
  89                 ret = -EINVAL;
  90         else
  91                 *gid = cache->table[index];
  92
  93         read_unlock_irqrestore(&device->cache.lock, flags);
  94
  95         return ret;
  96 }
  97 EXPORT_SYMBOL(ib_get_cached_gid);
  98
  99 int ib_find_cached_gid(struct ib_device *device,
 100                        union ib_gid     *gid,
 101                        u8               *port_num,
 102                        u16              *index)
 103 {
 104         struct ib_gid_cache *cache;
 105         unsigned long flags;
 106         int p, i;
 107         int ret = -ENOENT;
 108
 109         *port_num = -1;
 110         if (index)
 111                 *index = -1;
 112
 113         read_lock_irqsave(&device->cache.lock, flags);
 114
 115         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
 116                 cache = device->cache.gid_cache[p];
 117                 for (i = 0; i < cache->table_len; ++i) {
 118                         if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
 119                                 *port_num = p + start_port(device);
 120                                 if (index)
 121                                         *index = i;
 122                                 ret = 0;
 123                                 goto found;
 124                         }
 125                 }
 126         }
 127 found:
 128         read_unlock_irqrestore(&device->cache.lock, flags);
 129
 130         return ret;
 131 }
 132 EXPORT_SYMBOL(ib_find_cached_gid);
 133
 134 int ib_get_cached_pkey(struct ib_device *device,
 135                        u8                port_num,
 136                        int               index,
 137                        u16              *pkey)
 138 {
 139         struct ib_pkey_cache *cache;
 140         unsigned long flags;
 141         int ret = 0;
 142
 143         if (port_num < start_port(device) || port_num > end_port(device))
 144                 return -EINVAL;
 145
 146         read_lock_irqsave(&device->cache.lock, flags);
 147
 148         cache = device->cache.pkey_cache[port_num - start_port(device)];
 149
 150         if (index < 0 || index >= cache->table_len)
 151                 ret = -EINVAL;
 152         else
 153                 *pkey = cache->table[index];
 154
 155         read_unlock_irqrestore(&device->cache.lock, flags);
 156
 157         return ret;
 158 }
 159 EXPORT_SYMBOL(ib_get_cached_pkey);
 160
 161 int ib_find_cached_pkey(struct ib_device *device,
 162                         u8                port_num,
 163                         u16               pkey,
 164                         u16              *index)
 165 {
 166         struct ib_pkey_cache *cache;
 167         unsigned long flags;
 168         int i;
 169         int ret = -ENOENT;
 170
 171         if (port_num < start_port(device) || port_num > end_port(device))
 172                 return -EINVAL;
 173
 174         read_lock_irqsave(&device->cache.lock, flags);
 175
 176         cache = device->cache.pkey_cache[port_num - start_port(device)];
 177
 178         *index = -1;
 179
 180         for (i = 0; i < cache->table_len; ++i)
 181                 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
 182                         *index = i;
 183                         ret = 0;
 184                         break;
 185                 }
 186
 187         read_unlock_irqrestore(&device->cache.lock, flags);
 188
 189         return ret;
 190 }
 191 EXPORT_SYMBOL(ib_find_cached_pkey);
 192
 193 int ib_get_cached_lmc(struct ib_device *device,
 194                       u8                port_num,
 195                       u8                *lmc)
 196 {
 197         unsigned long flags;
 198         int ret = 0;
 199
 200         if (port_num < start_port(device) || port_num > end_port(device))
 201                 return -EINVAL;
 202
 203         read_lock_irqsave(&device->cache.lock, flags);
 204         *lmc = device->cache.lmc_cache[port_num - start_port(device)];
 205         read_unlock_irqrestore(&device->cache.lock, flags);
 206
 207         return ret;
 208 }
 209 EXPORT_SYMBOL(ib_get_cached_lmc);
 210
 211 static void ib_cache_update(struct ib_device *device,
 212                             u8                port)
 213 {
 214         struct ib_port_attr       *tprops = NULL;
 215         struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
 216         struct ib_gid_cache       *gid_cache = NULL, *old_gid_cache;
 217         int                        i;
 218         int                        ret;
 219
 220         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
 221         if (!tprops)
 222                 return;
 223
 224         ret = ib_query_port(device, port, tprops);
 225         if (ret) {
 226                 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
 227                        ret, device->name);
 228                 goto err;
 229         }
 230
 231         pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
 232                              sizeof *pkey_cache->table, GFP_KERNEL);
 233         if (!pkey_cache)
 234                 goto err;
 235
 236         pkey_cache->table_len = tprops->pkey_tbl_len;
 237
 238         gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
 239                             sizeof *gid_cache->table, GFP_KERNEL);
 240         if (!gid_cache)
 241                 goto err;
 242
 243         gid_cache->table_len = tprops->gid_tbl_len;
 244
 245         for (i = 0; i < pkey_cache->table_len; ++i) {
 246                 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
 247                 if (ret) {
 248                         printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
 249                                ret, device->name, i);
 250                         goto err;
 251                 }
 252         }
 253
 254         for (i = 0; i < gid_cache->table_len; ++i) {
 255                 ret = ib_query_gid(device, port, i, gid_cache->table + i);
 256                 if (ret) {
 257                         printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
 258                                ret, device->name, i);
 259                         goto err;
 260                 }
 261         }
 262
 263         write_lock_irq(&device->cache.lock);
 264
 265         old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
 266         old_gid_cache  = device->cache.gid_cache [port - start_port(device)];
 267
 268         device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
 269         device->cache.gid_cache [port - start_port(device)] = gid_cache;
 270
 271         device->cache.lmc_cache[port - start_port(device)] = tprops->lmc;
 272
 273         write_unlock_irq(&device->cache.lock);
 274
 275         kfree(old_pkey_cache);
 276         kfree(old_gid_cache);
 277         kfree(tprops);
 278         return;
 279
 280 err:
 281         kfree(pkey_cache);
 282         kfree(gid_cache);
 283         kfree(tprops);
 284 }
 285
 286 static void ib_cache_task(struct work_struct *_work)
 287 {
 288         struct ib_update_work *work =
 289                 container_of(_work, struct ib_update_work, work);
 290
 291         ib_cache_update(work->device, work->port_num);
 292         kfree(work);
 293 }
 294
 295 static void ib_cache_event(struct ib_event_handler *handler,
 296                            struct ib_event *event)
 297 {
 298         struct ib_update_work *work;
 299
 300         if (event->event == IB_EVENT_PORT_ERR    ||
 301             event->event == IB_EVENT_PORT_ACTIVE ||
 302             event->event == IB_EVENT_LID_CHANGE  ||
 303             event->event == IB_EVENT_PKEY_CHANGE ||
 304             event->event == IB_EVENT_SM_CHANGE   ||
 305             event->event == IB_EVENT_CLIENT_REREGISTER) {
 306                 work = kmalloc(sizeof *work, GFP_ATOMIC);
 307                 if (work) {
 308                         INIT_WORK(&work->work, ib_cache_task);
 309                         work->device   = event->device;
 310                         work->port_num = event->element.port_num;
 311                         schedule_work(&work->work);
 312                 }
 313         }
 314 }
 315
 316 static void ib_cache_setup_one(struct ib_device *device)
 317 {
 318         int p;
 319
 320         rwlock_init(&device->cache.lock);
 321
 322         device->cache.pkey_cache =
 323                 kmalloc(sizeof *device->cache.pkey_cache *
 324                         (end_port(device) - start_port(device) + 1), GFP_KERNEL);
 325         device->cache.gid_cache =
 326                 kmalloc(sizeof *device->cache.gid_cache *
 327                         (end_port(device) - start_port(device) + 1), GFP_KERNEL);
 328
 329         device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
 330                                           (end_port(device) -
 331                                            start_port(device) + 1),
 332                                           GFP_KERNEL);
 333
 334         if (!device->cache.pkey_cache || !device->cache.gid_cache ||
 335             !device->cache.lmc_cache) {
 336                 printk(KERN_WARNING "Couldn't allocate cache "
 337                        "for %s\n", device->name);
 338                 goto err;
 339         }
 340
 341         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
 342                 device->cache.pkey_cache[p] = NULL;
 343                 device->cache.gid_cache [p] = NULL;
 344                 ib_cache_update(device, p + start_port(device));
 345         }
 346
 347         INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
 348                               device, ib_cache_event);
 349         if (ib_register_event_handler(&device->cache.event_handler))
 350                 goto err_cache;
 351
 352         return;
 353
 354 err_cache:
 355         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
 356                 kfree(device->cache.pkey_cache[p]);
 357                 kfree(device->cache.gid_cache[p]);
 358         }
 359
 360 err:
 361         kfree(device->cache.pkey_cache);
 362         kfree(device->cache.gid_cache);
 363         kfree(device->cache.lmc_cache);
 364 }
 365
 366 static void ib_cache_cleanup_one(struct ib_device *device)
 367 {
 368         int p;
 369
 370         ib_unregister_event_handler(&device->cache.event_handler);
 371         flush_scheduled_work();
 372
 373         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
 374                 kfree(device->cache.pkey_cache[p]);
 375                 kfree(device->cache.gid_cache[p]);
 376         }
 377
 378         kfree(device->cache.pkey_cache);
 379         kfree(device->cache.gid_cache);
 380         kfree(device->cache.lmc_cache);
 381 }
 382
 383 static struct ib_client cache_client = {
 384         .name   = "cache",
 385         .add    = ib_cache_setup_one,
 386         .remove = ib_cache_cleanup_one
 387 };
 388
 389 int __init ib_cache_setup(void)
 390 {
 391         return ib_register_client(&cache_client);
 392 }
 393
 394 void __exit ib_cache_cleanup(void)
 395 {
 396         ib_unregister_client(&cache_client);
 397 }