drivers/infiniband/hw/mlx4/cm.c

   1 /*
   2  * Copyright (c) 2012 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <rdma/ib_mad.h>
  34
  35 #include <linux/mlx4/cmd.h>
  36 #include <linux/rbtree.h>
  37 #include <linux/idr.h>
  38 #include <rdma/ib_cm.h>
  39
  40 #include "mlx4_ib.h"
  41
  42 #define CM_CLEANUP_CACHE_TIMEOUT  (5 * HZ)
  43
  44 struct id_map_entry {
  45         struct rb_node node;
  46
  47         u32 sl_cm_id;
  48         u32 pv_cm_id;
  49         int slave_id;
  50         int scheduled_delete;
  51         struct mlx4_ib_dev *dev;
  52
  53         struct list_head list;
  54         struct delayed_work timeout;
  55 };
  56
  57 struct cm_generic_msg {
  58         struct ib_mad_hdr hdr;
  59
  60         __be32 local_comm_id;
  61         __be32 remote_comm_id;
  62 };
  63
  64 struct cm_sidr_generic_msg {
  65         struct ib_mad_hdr hdr;
  66         __be32 request_id;
  67 };
  68
  69 struct cm_req_msg {
  70         unsigned char unused[0x60];
  71         union ib_gid primary_path_sgid;
  72 };
  73
  74
  75 static void set_local_comm_id(struct ib_mad *mad, u32 cm_id)
  76 {
  77         if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
  78                 struct cm_sidr_generic_msg *msg =
  79                         (struct cm_sidr_generic_msg *)mad;
  80                 msg->request_id = cpu_to_be32(cm_id);
  81         } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
  82                 pr_err("trying to set local_comm_id in SIDR_REP\n");
  83                 return;
  84         } else {
  85                 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
  86                 msg->local_comm_id = cpu_to_be32(cm_id);
  87         }
  88 }
  89
  90 static u32 get_local_comm_id(struct ib_mad *mad)
  91 {
  92         if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
  93                 struct cm_sidr_generic_msg *msg =
  94                         (struct cm_sidr_generic_msg *)mad;
  95                 return be32_to_cpu(msg->request_id);
  96         } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
  97                 pr_err("trying to set local_comm_id in SIDR_REP\n");
  98                 return -1;
  99         } else {
 100                 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
 101                 return be32_to_cpu(msg->local_comm_id);
 102         }
 103 }
 104
 105 static void set_remote_comm_id(struct ib_mad *mad, u32 cm_id)
 106 {
 107         if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
 108                 struct cm_sidr_generic_msg *msg =
 109                         (struct cm_sidr_generic_msg *)mad;
 110                 msg->request_id = cpu_to_be32(cm_id);
 111         } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
 112                 pr_err("trying to set remote_comm_id in SIDR_REQ\n");
 113                 return;
 114         } else {
 115                 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
 116                 msg->remote_comm_id = cpu_to_be32(cm_id);
 117         }
 118 }
 119
 120 static u32 get_remote_comm_id(struct ib_mad *mad)
 121 {
 122         if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
 123                 struct cm_sidr_generic_msg *msg =
 124                         (struct cm_sidr_generic_msg *)mad;
 125                 return be32_to_cpu(msg->request_id);
 126         } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
 127                 pr_err("trying to set remote_comm_id in SIDR_REQ\n");
 128                 return -1;
 129         } else {
 130                 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
 131                 return be32_to_cpu(msg->remote_comm_id);
 132         }
 133 }
 134
 135 static union ib_gid gid_from_req_msg(struct ib_device *ibdev, struct ib_mad *mad)
 136 {
 137         struct cm_req_msg *msg = (struct cm_req_msg *)mad;
 138
 139         return msg->primary_path_sgid;
 140 }
 141
 142 /* Lock should be taken before called */
 143 static struct id_map_entry *
 144 id_map_find_by_sl_id(struct ib_device *ibdev, u32 slave_id, u32 sl_cm_id)
 145 {
 146         struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map;
 147         struct rb_node *node = sl_id_map->rb_node;
 148
 149         while (node) {
 150                 struct id_map_entry *id_map_entry =
 151                         rb_entry(node, struct id_map_entry, node);
 152
 153                 if (id_map_entry->sl_cm_id > sl_cm_id)
 154                         node = node->rb_left;
 155                 else if (id_map_entry->sl_cm_id < sl_cm_id)
 156                         node = node->rb_right;
 157                 else if (id_map_entry->slave_id > slave_id)
 158                         node = node->rb_left;
 159                 else if (id_map_entry->slave_id < slave_id)
 160                         node = node->rb_right;
 161                 else
 162                         return id_map_entry;
 163         }
 164         return NULL;
 165 }
 166
 167 static void id_map_ent_timeout(struct work_struct *work)
 168 {
 169         struct delayed_work *delay = to_delayed_work(work);
 170         struct id_map_entry *ent = container_of(delay, struct id_map_entry, timeout);
 171         struct id_map_entry *db_ent, *found_ent;
 172         struct mlx4_ib_dev *dev = ent->dev;
 173         struct mlx4_ib_sriov *sriov = &dev->sriov;
 174         struct rb_root *sl_id_map = &sriov->sl_id_map;
 175         int pv_id = (int) ent->pv_cm_id;
 176
 177         spin_lock(&sriov->id_map_lock);
 178         db_ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_id);
 179         if (!db_ent)
 180                 goto out;
 181         found_ent = id_map_find_by_sl_id(&dev->ib_dev, ent->slave_id, ent->sl_cm_id);
 182         if (found_ent && found_ent == ent)
 183                 rb_erase(&found_ent->node, sl_id_map);
 184         idr_remove(&sriov->pv_id_table, pv_id);
 185
 186 out:
 187         list_del(&ent->list);
 188         spin_unlock(&sriov->id_map_lock);
 189         kfree(ent);
 190 }
 191
 192 static void id_map_find_del(struct ib_device *ibdev, int pv_cm_id)
 193 {
 194         struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
 195         struct rb_root *sl_id_map = &sriov->sl_id_map;
 196         struct id_map_entry *ent, *found_ent;
 197
 198         spin_lock(&sriov->id_map_lock);
 199         ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_cm_id);
 200         if (!ent)
 201                 goto out;
 202         found_ent = id_map_find_by_sl_id(ibdev, ent->slave_id, ent->sl_cm_id);
 203         if (found_ent && found_ent == ent)
 204                 rb_erase(&found_ent->node, sl_id_map);
 205         idr_remove(&sriov->pv_id_table, pv_cm_id);
 206 out:
 207         spin_unlock(&sriov->id_map_lock);
 208 }
 209
 210 static void sl_id_map_add(struct ib_device *ibdev, struct id_map_entry *new)
 211 {
 212         struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map;
 213         struct rb_node **link = &sl_id_map->rb_node, *parent = NULL;
 214         struct id_map_entry *ent;
 215         int slave_id = new->slave_id;
 216         int sl_cm_id = new->sl_cm_id;
 217
 218         ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id);
 219         if (ent) {
 220                 pr_debug("overriding existing sl_id_map entry (cm_id = %x)\n",
 221                          sl_cm_id);
 222
 223                 rb_replace_node(&ent->node, &new->node, sl_id_map);
 224                 return;
 225         }
 226
 227         /* Go to the bottom of the tree */
 228         while (*link) {
 229                 parent = *link;
 230                 ent = rb_entry(parent, struct id_map_entry, node);
 231
 232                 if (ent->sl_cm_id > sl_cm_id || (ent->sl_cm_id == sl_cm_id && ent->slave_id > slave_id))
 233                         link = &(*link)->rb_left;
 234                 else
 235                         link = &(*link)->rb_right;
 236         }
 237
 238         rb_link_node(&new->node, parent, link);
 239         rb_insert_color(&new->node, sl_id_map);
 240 }
 241
 242 static struct id_map_entry *
 243 id_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id)
 244 {
 245         int ret;
 246         struct id_map_entry *ent;
 247         struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
 248
 249         ent = kmalloc(sizeof (struct id_map_entry), GFP_KERNEL);
 250         if (!ent)
 251                 return ERR_PTR(-ENOMEM);
 252
 253         ent->sl_cm_id = sl_cm_id;
 254         ent->slave_id = slave_id;
 255         ent->scheduled_delete = 0;
 256         ent->dev = to_mdev(ibdev);
 257         INIT_DELAYED_WORK(&ent->timeout, id_map_ent_timeout);
 258
 259         idr_preload(GFP_KERNEL);
 260         spin_lock(&to_mdev(ibdev)->sriov.id_map_lock);
 261
 262         ret = idr_alloc_cyclic(&sriov->pv_id_table, ent, 0, 0, GFP_NOWAIT);
 263         if (ret >= 0) {
 264                 ent->pv_cm_id = (u32)ret;
 265                 sl_id_map_add(ibdev, ent);
 266                 list_add_tail(&ent->list, &sriov->cm_list);
 267         }
 268
 269         spin_unlock(&sriov->id_map_lock);
 270         idr_preload_end();
 271
 272         if (ret >= 0)
 273                 return ent;
 274
 275         /*error flow*/
 276         kfree(ent);
 277         mlx4_ib_warn(ibdev, "No more space in the idr (err:0x%x)\n", ret);
 278         return ERR_PTR(-ENOMEM);
 279 }
 280
 281 static struct id_map_entry *
 282 id_map_get(struct ib_device *ibdev, int *pv_cm_id, int slave_id, int sl_cm_id)
 283 {
 284         struct id_map_entry *ent;
 285         struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
 286
 287         spin_lock(&sriov->id_map_lock);
 288         if (*pv_cm_id == -1) {
 289                 ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id);
 290                 if (ent)
 291                         *pv_cm_id = (int) ent->pv_cm_id;
 292         } else
 293                 ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, *pv_cm_id);
 294         spin_unlock(&sriov->id_map_lock);
 295
 296         return ent;
 297 }
 298
 299 static void schedule_delayed(struct ib_device *ibdev, struct id_map_entry *id)
 300 {
 301         struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
 302         unsigned long flags;
 303
 304         spin_lock(&sriov->id_map_lock);
 305         spin_lock_irqsave(&sriov->going_down_lock, flags);
 306         /*make sure that there is no schedule inside the scheduled work.*/
 307         if (!sriov->is_going_down) {
 308                 id->scheduled_delete = 1;
 309                 schedule_delayed_work(&id->timeout, CM_CLEANUP_CACHE_TIMEOUT);
 310         }
 311         spin_unlock_irqrestore(&sriov->going_down_lock, flags);
 312         spin_unlock(&sriov->id_map_lock);
 313 }
 314
 315 int mlx4_ib_multiplex_cm_handler(struct ib_device *ibdev, int port, int slave_id,
 316                 struct ib_mad *mad)
 317 {
 318         struct id_map_entry *id;
 319         u32 sl_cm_id;
 320         int pv_cm_id = -1;
 321
 322         if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID ||
 323                         mad->mad_hdr.attr_id == CM_REP_ATTR_ID ||
 324                         mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
 325                 sl_cm_id = get_local_comm_id(mad);
 326                 id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id);
 327                 if (id)
 328                         goto cont;
 329                 id = id_map_alloc(ibdev, slave_id, sl_cm_id);
 330                 if (IS_ERR(id)) {
 331                         mlx4_ib_warn(ibdev, "%s: id{slave: %d, sl_cm_id: 0x%x} Failed to id_map_alloc\n",
 332                                 __func__, slave_id, sl_cm_id);
 333                         return PTR_ERR(id);
 334                 }
 335         } else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID ||
 336                    mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
 337                 return 0;
 338         } else {
 339                 sl_cm_id = get_local_comm_id(mad);
 340                 id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id);
 341         }
 342
 343         if (!id) {
 344                 pr_debug("id{slave: %d, sl_cm_id: 0x%x} is NULL!\n",
 345                          slave_id, sl_cm_id);
 346                 return -EINVAL;
 347         }
 348
 349 cont:
 350         set_local_comm_id(mad, id->pv_cm_id);
 351
 352         if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID)
 353                 schedule_delayed(ibdev, id);
 354         else if (mad->mad_hdr.attr_id == CM_DREP_ATTR_ID)
 355                 id_map_find_del(ibdev, pv_cm_id);
 356
 357         return 0;
 358 }
 359
 360 int mlx4_ib_demux_cm_handler(struct ib_device *ibdev, int port, int *slave,
 361                              struct ib_mad *mad)
 362 {
 363         u32 pv_cm_id;
 364         struct id_map_entry *id;
 365
 366         if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID ||
 367             mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
 368                 union ib_gid gid;
 369
 370                 if (!slave)
 371                         return 0;
 372
 373                 gid = gid_from_req_msg(ibdev, mad);
 374                 *slave = mlx4_ib_find_real_gid(ibdev, port, gid.global.interface_id);
 375                 if (*slave < 0) {
 376                         mlx4_ib_warn(ibdev, "failed matching slave_id by gid (0x%llx)\n",
 377                                      be64_to_cpu(gid.global.interface_id));
 378                         return -ENOENT;
 379                 }
 380                 return 0;
 381         }
 382
 383         pv_cm_id = get_remote_comm_id(mad);
 384         id = id_map_get(ibdev, (int *)&pv_cm_id, -1, -1);
 385
 386         if (!id) {
 387                 pr_debug("Couldn't find an entry for pv_cm_id 0x%x\n", pv_cm_id);
 388                 return -ENOENT;
 389         }
 390
 391         if (slave)
 392                 *slave = id->slave_id;
 393         set_remote_comm_id(mad, id->sl_cm_id);
 394
 395         if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID)
 396                 schedule_delayed(ibdev, id);
 397         else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID ||
 398                         mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) {
 399                 id_map_find_del(ibdev, (int) pv_cm_id);
 400         }
 401
 402         return 0;
 403 }
 404
 405 void mlx4_ib_cm_paravirt_init(struct mlx4_ib_dev *dev)
 406 {
 407         spin_lock_init(&dev->sriov.id_map_lock);
 408         INIT_LIST_HEAD(&dev->sriov.cm_list);
 409         dev->sriov.sl_id_map = RB_ROOT;
 410         idr_init(&dev->sriov.pv_id_table);
 411 }
 412
 413 /* slave = -1 ==> all slaves */
 414 /* TBD -- call paravirt clean for single slave.  Need for slave RESET event */
 415 void mlx4_ib_cm_paravirt_clean(struct mlx4_ib_dev *dev, int slave)
 416 {
 417         struct mlx4_ib_sriov *sriov = &dev->sriov;
 418         struct rb_root *sl_id_map = &sriov->sl_id_map;
 419         struct list_head lh;
 420         struct rb_node *nd;
 421         int need_flush = 0;
 422         struct id_map_entry *map, *tmp_map;
 423         /* cancel all delayed work queue entries */
 424         INIT_LIST_HEAD(&lh);
 425         spin_lock(&sriov->id_map_lock);
 426         list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) {
 427                 if (slave < 0 || slave == map->slave_id) {
 428                         if (map->scheduled_delete)
 429                                 need_flush |= !cancel_delayed_work(&map->timeout);
 430                 }
 431         }
 432
 433         spin_unlock(&sriov->id_map_lock);
 434
 435         if (need_flush)
 436                 flush_scheduled_work(); /* make sure all timers were flushed */
 437
 438         /* now, remove all leftover entries from databases*/
 439         spin_lock(&sriov->id_map_lock);
 440         if (slave < 0) {
 441                 while (rb_first(sl_id_map)) {
 442                         struct id_map_entry *ent =
 443                                 rb_entry(rb_first(sl_id_map),
 444                                          struct id_map_entry, node);
 445
 446                         rb_erase(&ent->node, sl_id_map);
 447                         idr_remove(&sriov->pv_id_table, (int) ent->pv_cm_id);
 448                 }
 449                 list_splice_init(&dev->sriov.cm_list, &lh);
 450         } else {
 451                 /* first, move nodes belonging to slave to db remove list */
 452                 nd = rb_first(sl_id_map);
 453                 while (nd) {
 454                         struct id_map_entry *ent =
 455                                 rb_entry(nd, struct id_map_entry, node);
 456                         nd = rb_next(nd);
 457                         if (ent->slave_id == slave)
 458                                 list_move_tail(&ent->list, &lh);
 459                 }
 460                 /* remove those nodes from databases */
 461                 list_for_each_entry_safe(map, tmp_map, &lh, list) {
 462                         rb_erase(&map->node, sl_id_map);
 463                         idr_remove(&sriov->pv_id_table, (int) map->pv_cm_id);
 464                 }
 465
 466                 /* add remaining nodes from cm_list */
 467                 list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) {
 468                         if (slave == map->slave_id)
 469                                 list_move_tail(&map->list, &lh);
 470                 }
 471         }
 472
 473         spin_unlock(&sriov->id_map_lock);
 474
 475         /* free any map entries left behind due to cancel_delayed_work above */
 476         list_for_each_entry_safe(map, tmp_map, &lh, list) {
 477                 list_del(&map->list);
 478                 kfree(map);
 479         }
 480 }