drivers/infiniband/hw/cxgb4/device.c

   1 /*
   2  * Copyright (c) 2009-2010 Chelsio, Inc. 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 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/debugfs.h>
  35 #include <linux/vmalloc.h>
  36
  37 #include <rdma/ib_verbs.h>
  38
  39 #include "iw_cxgb4.h"
  40
  41 #define DRV_VERSION "0.1"
  42
  43 MODULE_AUTHOR("Steve Wise");
  44 MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
  45 MODULE_LICENSE("Dual BSD/GPL");
  46 MODULE_VERSION(DRV_VERSION);
  47
  48 static int allow_db_fc_on_t5;
  49 module_param(allow_db_fc_on_t5, int, 0644);
  50 MODULE_PARM_DESC(allow_db_fc_on_t5,
  51                  "Allow DB Flow Control on T5 (default = 0)");
  52
  53 static int allow_db_coalescing_on_t5;
  54 module_param(allow_db_coalescing_on_t5, int, 0644);
  55 MODULE_PARM_DESC(allow_db_coalescing_on_t5,
  56                  "Allow DB Coalescing on T5 (default = 0)");
  57
  58 struct uld_ctx {
  59         struct list_head entry;
  60         struct cxgb4_lld_info lldi;
  61         struct c4iw_dev *dev;
  62 };
  63
  64 static LIST_HEAD(uld_ctx_list);
  65 static DEFINE_MUTEX(dev_mutex);
  66
  67 #define DB_FC_RESUME_SIZE 64
  68 #define DB_FC_RESUME_DELAY 1
  69 #define DB_FC_DRAIN_THRESH 0
  70
  71 static struct dentry *c4iw_debugfs_root;
  72
  73 struct c4iw_debugfs_data {
  74         struct c4iw_dev *devp;
  75         char *buf;
  76         int bufsize;
  77         int pos;
  78 };
  79
  80 /* registered cxgb4 netlink callbacks */
  81 static struct ibnl_client_cbs c4iw_nl_cb_table[] = {
  82         [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
  83         [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
  84         [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
  85         [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
  86         [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
  87         [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
  88 };
  89
  90 static int count_idrs(int id, void *p, void *data)
  91 {
  92         int *countp = data;
  93
  94         *countp = *countp + 1;
  95         return 0;
  96 }
  97
  98 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  99                             loff_t *ppos)
 100 {
 101         struct c4iw_debugfs_data *d = file->private_data;
 102
 103         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
 104 }
 105
 106 static int dump_qp(int id, void *p, void *data)
 107 {
 108         struct c4iw_qp *qp = p;
 109         struct c4iw_debugfs_data *qpd = data;
 110         int space;
 111         int cc;
 112
 113         if (id != qp->wq.sq.qid)
 114                 return 0;
 115
 116         space = qpd->bufsize - qpd->pos - 1;
 117         if (space == 0)
 118                 return 1;
 119
 120         if (qp->ep) {
 121                 if (qp->ep->com.local_addr.ss_family == AF_INET) {
 122                         struct sockaddr_in *lsin = (struct sockaddr_in *)
 123                                 &qp->ep->com.local_addr;
 124                         struct sockaddr_in *rsin = (struct sockaddr_in *)
 125                                 &qp->ep->com.remote_addr;
 126                         struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 127                                 &qp->ep->com.mapped_local_addr;
 128                         struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 129                                 &qp->ep->com.mapped_remote_addr;
 130
 131                         cc = snprintf(qpd->buf + qpd->pos, space,
 132                                       "rc qp sq id %u rq id %u state %u "
 133                                       "onchip %u ep tid %u state %u "
 134                                       "%pI4:%u/%u->%pI4:%u/%u\n",
 135                                       qp->wq.sq.qid, qp->wq.rq.qid,
 136                                       (int)qp->attr.state,
 137                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 138                                       qp->ep->hwtid, (int)qp->ep->com.state,
 139                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 140                                       ntohs(mapped_lsin->sin_port),
 141                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 142                                       ntohs(mapped_rsin->sin_port));
 143                 } else {
 144                         struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 145                                 &qp->ep->com.local_addr;
 146                         struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 147                                 &qp->ep->com.remote_addr;
 148                         struct sockaddr_in6 *mapped_lsin6 =
 149                                 (struct sockaddr_in6 *)
 150                                 &qp->ep->com.mapped_local_addr;
 151                         struct sockaddr_in6 *mapped_rsin6 =
 152                                 (struct sockaddr_in6 *)
 153                                 &qp->ep->com.mapped_remote_addr;
 154
 155                         cc = snprintf(qpd->buf + qpd->pos, space,
 156                                       "rc qp sq id %u rq id %u state %u "
 157                                       "onchip %u ep tid %u state %u "
 158                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 159                                       qp->wq.sq.qid, qp->wq.rq.qid,
 160                                       (int)qp->attr.state,
 161                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 162                                       qp->ep->hwtid, (int)qp->ep->com.state,
 163                                       &lsin6->sin6_addr,
 164                                       ntohs(lsin6->sin6_port),
 165                                       ntohs(mapped_lsin6->sin6_port),
 166                                       &rsin6->sin6_addr,
 167                                       ntohs(rsin6->sin6_port),
 168                                       ntohs(mapped_rsin6->sin6_port));
 169                 }
 170         } else
 171                 cc = snprintf(qpd->buf + qpd->pos, space,
 172                              "qp sq id %u rq id %u state %u onchip %u\n",
 173                               qp->wq.sq.qid, qp->wq.rq.qid,
 174                               (int)qp->attr.state,
 175                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 176         if (cc < space)
 177                 qpd->pos += cc;
 178         return 0;
 179 }
 180
 181 static int qp_release(struct inode *inode, struct file *file)
 182 {
 183         struct c4iw_debugfs_data *qpd = file->private_data;
 184         if (!qpd) {
 185                 printk(KERN_INFO "%s null qpd?\n", __func__);
 186                 return 0;
 187         }
 188         vfree(qpd->buf);
 189         kfree(qpd);
 190         return 0;
 191 }
 192
 193 static int qp_open(struct inode *inode, struct file *file)
 194 {
 195         struct c4iw_debugfs_data *qpd;
 196         int ret = 0;
 197         int count = 1;
 198
 199         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 200         if (!qpd) {
 201                 ret = -ENOMEM;
 202                 goto out;
 203         }
 204         qpd->devp = inode->i_private;
 205         qpd->pos = 0;
 206
 207         spin_lock_irq(&qpd->devp->lock);
 208         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 209         spin_unlock_irq(&qpd->devp->lock);
 210
 211         qpd->bufsize = count * 128;
 212         qpd->buf = vmalloc(qpd->bufsize);
 213         if (!qpd->buf) {
 214                 ret = -ENOMEM;
 215                 goto err1;
 216         }
 217
 218         spin_lock_irq(&qpd->devp->lock);
 219         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 220         spin_unlock_irq(&qpd->devp->lock);
 221
 222         qpd->buf[qpd->pos++] = 0;
 223         file->private_data = qpd;
 224         goto out;
 225 err1:
 226         kfree(qpd);
 227 out:
 228         return ret;
 229 }
 230
 231 static const struct file_operations qp_debugfs_fops = {
 232         .owner   = THIS_MODULE,
 233         .open    = qp_open,
 234         .release = qp_release,
 235         .read    = debugfs_read,
 236         .llseek  = default_llseek,
 237 };
 238
 239 static int dump_stag(int id, void *p, void *data)
 240 {
 241         struct c4iw_debugfs_data *stagd = data;
 242         int space;
 243         int cc;
 244
 245         space = stagd->bufsize - stagd->pos - 1;
 246         if (space == 0)
 247                 return 1;
 248
 249         cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
 250         if (cc < space)
 251                 stagd->pos += cc;
 252         return 0;
 253 }
 254
 255 static int stag_release(struct inode *inode, struct file *file)
 256 {
 257         struct c4iw_debugfs_data *stagd = file->private_data;
 258         if (!stagd) {
 259                 printk(KERN_INFO "%s null stagd?\n", __func__);
 260                 return 0;
 261         }
 262         kfree(stagd->buf);
 263         kfree(stagd);
 264         return 0;
 265 }
 266
 267 static int stag_open(struct inode *inode, struct file *file)
 268 {
 269         struct c4iw_debugfs_data *stagd;
 270         int ret = 0;
 271         int count = 1;
 272
 273         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 274         if (!stagd) {
 275                 ret = -ENOMEM;
 276                 goto out;
 277         }
 278         stagd->devp = inode->i_private;
 279         stagd->pos = 0;
 280
 281         spin_lock_irq(&stagd->devp->lock);
 282         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 283         spin_unlock_irq(&stagd->devp->lock);
 284
 285         stagd->bufsize = count * sizeof("0x12345678\n");
 286         stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
 287         if (!stagd->buf) {
 288                 ret = -ENOMEM;
 289                 goto err1;
 290         }
 291
 292         spin_lock_irq(&stagd->devp->lock);
 293         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 294         spin_unlock_irq(&stagd->devp->lock);
 295
 296         stagd->buf[stagd->pos++] = 0;
 297         file->private_data = stagd;
 298         goto out;
 299 err1:
 300         kfree(stagd);
 301 out:
 302         return ret;
 303 }
 304
 305 static const struct file_operations stag_debugfs_fops = {
 306         .owner   = THIS_MODULE,
 307         .open    = stag_open,
 308         .release = stag_release,
 309         .read    = debugfs_read,
 310         .llseek  = default_llseek,
 311 };
 312
 313 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 314
 315 static int stats_show(struct seq_file *seq, void *v)
 316 {
 317         struct c4iw_dev *dev = seq->private;
 318
 319         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 320                    "Max", "Fail");
 321         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 322                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 323                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 324         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 325                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 326                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 327         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 328                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 329                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 330         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 331                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 332                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 333         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 334                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 335                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 336         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 337                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 338                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 339         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 340         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 341         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 342         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 343                    db_state_str[dev->db_state],
 344                    dev->rdev.stats.db_state_transitions,
 345                    dev->rdev.stats.db_fc_interruptions);
 346         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 347         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 348                    dev->rdev.stats.act_ofld_conn_fails);
 349         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 350                    dev->rdev.stats.pas_ofld_conn_fails);
 351         return 0;
 352 }
 353
 354 static int stats_open(struct inode *inode, struct file *file)
 355 {
 356         return single_open(file, stats_show, inode->i_private);
 357 }
 358
 359 static ssize_t stats_clear(struct file *file, const char __user *buf,
 360                 size_t count, loff_t *pos)
 361 {
 362         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 363
 364         mutex_lock(&dev->rdev.stats.lock);
 365         dev->rdev.stats.pd.max = 0;
 366         dev->rdev.stats.pd.fail = 0;
 367         dev->rdev.stats.qid.max = 0;
 368         dev->rdev.stats.qid.fail = 0;
 369         dev->rdev.stats.stag.max = 0;
 370         dev->rdev.stats.stag.fail = 0;
 371         dev->rdev.stats.pbl.max = 0;
 372         dev->rdev.stats.pbl.fail = 0;
 373         dev->rdev.stats.rqt.max = 0;
 374         dev->rdev.stats.rqt.fail = 0;
 375         dev->rdev.stats.ocqp.max = 0;
 376         dev->rdev.stats.ocqp.fail = 0;
 377         dev->rdev.stats.db_full = 0;
 378         dev->rdev.stats.db_empty = 0;
 379         dev->rdev.stats.db_drop = 0;
 380         dev->rdev.stats.db_state_transitions = 0;
 381         dev->rdev.stats.tcam_full = 0;
 382         dev->rdev.stats.act_ofld_conn_fails = 0;
 383         dev->rdev.stats.pas_ofld_conn_fails = 0;
 384         mutex_unlock(&dev->rdev.stats.lock);
 385         return count;
 386 }
 387
 388 static const struct file_operations stats_debugfs_fops = {
 389         .owner   = THIS_MODULE,
 390         .open    = stats_open,
 391         .release = single_release,
 392         .read    = seq_read,
 393         .llseek  = seq_lseek,
 394         .write   = stats_clear,
 395 };
 396
 397 static int dump_ep(int id, void *p, void *data)
 398 {
 399         struct c4iw_ep *ep = p;
 400         struct c4iw_debugfs_data *epd = data;
 401         int space;
 402         int cc;
 403
 404         space = epd->bufsize - epd->pos - 1;
 405         if (space == 0)
 406                 return 1;
 407
 408         if (ep->com.local_addr.ss_family == AF_INET) {
 409                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 410                         &ep->com.local_addr;
 411                 struct sockaddr_in *rsin = (struct sockaddr_in *)
 412                         &ep->com.remote_addr;
 413                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 414                         &ep->com.mapped_local_addr;
 415                 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 416                         &ep->com.mapped_remote_addr;
 417
 418                 cc = snprintf(epd->buf + epd->pos, space,
 419                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 420                               "history 0x%lx hwtid %d atid %d "
 421                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 422                               ep, ep->com.cm_id, ep->com.qp,
 423                               (int)ep->com.state, ep->com.flags,
 424                               ep->com.history, ep->hwtid, ep->atid,
 425                               &lsin->sin_addr, ntohs(lsin->sin_port),
 426                               ntohs(mapped_lsin->sin_port),
 427                               &rsin->sin_addr, ntohs(rsin->sin_port),
 428                               ntohs(mapped_rsin->sin_port));
 429         } else {
 430                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 431                         &ep->com.local_addr;
 432                 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 433                         &ep->com.remote_addr;
 434                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 435                         &ep->com.mapped_local_addr;
 436                 struct sockaddr_in6 *mapped_rsin6 = (struct sockaddr_in6 *)
 437                         &ep->com.mapped_remote_addr;
 438
 439                 cc = snprintf(epd->buf + epd->pos, space,
 440                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 441                               "history 0x%lx hwtid %d atid %d "
 442                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 443                               ep, ep->com.cm_id, ep->com.qp,
 444                               (int)ep->com.state, ep->com.flags,
 445                               ep->com.history, ep->hwtid, ep->atid,
 446                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 447                               ntohs(mapped_lsin6->sin6_port),
 448                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 449                               ntohs(mapped_rsin6->sin6_port));
 450         }
 451         if (cc < space)
 452                 epd->pos += cc;
 453         return 0;
 454 }
 455
 456 static int dump_listen_ep(int id, void *p, void *data)
 457 {
 458         struct c4iw_listen_ep *ep = p;
 459         struct c4iw_debugfs_data *epd = data;
 460         int space;
 461         int cc;
 462
 463         space = epd->bufsize - epd->pos - 1;
 464         if (space == 0)
 465                 return 1;
 466
 467         if (ep->com.local_addr.ss_family == AF_INET) {
 468                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 469                         &ep->com.local_addr;
 470                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 471                         &ep->com.mapped_local_addr;
 472
 473                 cc = snprintf(epd->buf + epd->pos, space,
 474                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 475                               "backlog %d %pI4:%d/%d\n",
 476                               ep, ep->com.cm_id, (int)ep->com.state,
 477                               ep->com.flags, ep->stid, ep->backlog,
 478                               &lsin->sin_addr, ntohs(lsin->sin_port),
 479                               ntohs(mapped_lsin->sin_port));
 480         } else {
 481                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 482                         &ep->com.local_addr;
 483                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 484                         &ep->com.mapped_local_addr;
 485
 486                 cc = snprintf(epd->buf + epd->pos, space,
 487                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 488                               "backlog %d %pI6:%d/%d\n",
 489                               ep, ep->com.cm_id, (int)ep->com.state,
 490                               ep->com.flags, ep->stid, ep->backlog,
 491                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 492                               ntohs(mapped_lsin6->sin6_port));
 493         }
 494         if (cc < space)
 495                 epd->pos += cc;
 496         return 0;
 497 }
 498
 499 static int ep_release(struct inode *inode, struct file *file)
 500 {
 501         struct c4iw_debugfs_data *epd = file->private_data;
 502         if (!epd) {
 503                 pr_info("%s null qpd?\n", __func__);
 504                 return 0;
 505         }
 506         vfree(epd->buf);
 507         kfree(epd);
 508         return 0;
 509 }
 510
 511 static int ep_open(struct inode *inode, struct file *file)
 512 {
 513         struct c4iw_debugfs_data *epd;
 514         int ret = 0;
 515         int count = 1;
 516
 517         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 518         if (!epd) {
 519                 ret = -ENOMEM;
 520                 goto out;
 521         }
 522         epd->devp = inode->i_private;
 523         epd->pos = 0;
 524
 525         spin_lock_irq(&epd->devp->lock);
 526         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 527         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 528         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 529         spin_unlock_irq(&epd->devp->lock);
 530
 531         epd->bufsize = count * 160;
 532         epd->buf = vmalloc(epd->bufsize);
 533         if (!epd->buf) {
 534                 ret = -ENOMEM;
 535                 goto err1;
 536         }
 537
 538         spin_lock_irq(&epd->devp->lock);
 539         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 540         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 541         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 542         spin_unlock_irq(&epd->devp->lock);
 543
 544         file->private_data = epd;
 545         goto out;
 546 err1:
 547         kfree(epd);
 548 out:
 549         return ret;
 550 }
 551
 552 static const struct file_operations ep_debugfs_fops = {
 553         .owner   = THIS_MODULE,
 554         .open    = ep_open,
 555         .release = ep_release,
 556         .read    = debugfs_read,
 557 };
 558
 559 static int setup_debugfs(struct c4iw_dev *devp)
 560 {
 561         struct dentry *de;
 562
 563         if (!devp->debugfs_root)
 564                 return -1;
 565
 566         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 567                                  (void *)devp, &qp_debugfs_fops);
 568         if (de && de->d_inode)
 569                 de->d_inode->i_size = 4096;
 570
 571         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 572                                  (void *)devp, &stag_debugfs_fops);
 573         if (de && de->d_inode)
 574                 de->d_inode->i_size = 4096;
 575
 576         de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
 577                         (void *)devp, &stats_debugfs_fops);
 578         if (de && de->d_inode)
 579                 de->d_inode->i_size = 4096;
 580
 581         de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
 582                         (void *)devp, &ep_debugfs_fops);
 583         if (de && de->d_inode)
 584                 de->d_inode->i_size = 4096;
 585
 586         return 0;
 587 }
 588
 589 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 590                                struct c4iw_dev_ucontext *uctx)
 591 {
 592         struct list_head *pos, *nxt;
 593         struct c4iw_qid_list *entry;
 594
 595         mutex_lock(&uctx->lock);
 596         list_for_each_safe(pos, nxt, &uctx->qpids) {
 597                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 598                 list_del_init(&entry->entry);
 599                 if (!(entry->qid & rdev->qpmask)) {
 600                         c4iw_put_resource(&rdev->resource.qid_table,
 601                                           entry->qid);
 602                         mutex_lock(&rdev->stats.lock);
 603                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 604                         mutex_unlock(&rdev->stats.lock);
 605                 }
 606                 kfree(entry);
 607         }
 608
 609         list_for_each_safe(pos, nxt, &uctx->qpids) {
 610                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 611                 list_del_init(&entry->entry);
 612                 kfree(entry);
 613         }
 614         mutex_unlock(&uctx->lock);
 615 }
 616
 617 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 618                             struct c4iw_dev_ucontext *uctx)
 619 {
 620         INIT_LIST_HEAD(&uctx->qpids);
 621         INIT_LIST_HEAD(&uctx->cqids);
 622         mutex_init(&uctx->lock);
 623 }
 624
 625 /* Caller takes care of locking if needed */
 626 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 627 {
 628         int err;
 629
 630         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 631
 632         /*
 633          * qpshift is the number of bits to shift the qpid left in order
 634          * to get the correct address of the doorbell for that qp.
 635          */
 636         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 637         rdev->qpmask = rdev->lldi.udb_density - 1;
 638         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 639         rdev->cqmask = rdev->lldi.ucq_density - 1;
 640         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 641              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 642              "qp qid start %u size %u cq qid start %u size %u\n",
 643              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 644              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 645              rdev->lldi.vr->pbl.start,
 646              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 647              rdev->lldi.vr->rq.size,
 648              rdev->lldi.vr->qp.start,
 649              rdev->lldi.vr->qp.size,
 650              rdev->lldi.vr->cq.start,
 651              rdev->lldi.vr->cq.size);
 652         PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 653              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 654              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 655              (u64)pci_resource_start(rdev->lldi.pdev, 2),
 656              rdev->lldi.db_reg,
 657              rdev->lldi.gts_reg,
 658              rdev->qpshift, rdev->qpmask,
 659              rdev->cqshift, rdev->cqmask);
 660
 661         if (c4iw_num_stags(rdev) == 0) {
 662                 err = -EINVAL;
 663                 goto err1;
 664         }
 665
 666         rdev->stats.pd.total = T4_MAX_NUM_PD;
 667         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 668         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 669         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 670         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 671         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 672
 673         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 674         if (err) {
 675                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 676                 goto err1;
 677         }
 678         err = c4iw_pblpool_create(rdev);
 679         if (err) {
 680                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 681                 goto err2;
 682         }
 683         err = c4iw_rqtpool_create(rdev);
 684         if (err) {
 685                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 686                 goto err3;
 687         }
 688         err = c4iw_ocqp_pool_create(rdev);
 689         if (err) {
 690                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 691                 goto err4;
 692         }
 693         rdev->status_page = (struct t4_dev_status_page *)
 694                             __get_free_page(GFP_KERNEL);
 695         if (!rdev->status_page) {
 696                 pr_err(MOD "error allocating status page\n");
 697                 goto err4;
 698         }
 699         rdev->status_page->db_off = 0;
 700         return 0;
 701 err4:
 702         c4iw_rqtpool_destroy(rdev);
 703 err3:
 704         c4iw_pblpool_destroy(rdev);
 705 err2:
 706         c4iw_destroy_resource(&rdev->resource);
 707 err1:
 708         return err;
 709 }
 710
 711 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 712 {
 713         free_page((unsigned long)rdev->status_page);
 714         c4iw_pblpool_destroy(rdev);
 715         c4iw_rqtpool_destroy(rdev);
 716         c4iw_destroy_resource(&rdev->resource);
 717 }
 718
 719 static void c4iw_dealloc(struct uld_ctx *ctx)
 720 {
 721         c4iw_rdev_close(&ctx->dev->rdev);
 722         idr_destroy(&ctx->dev->cqidr);
 723         idr_destroy(&ctx->dev->qpidr);
 724         idr_destroy(&ctx->dev->mmidr);
 725         idr_destroy(&ctx->dev->hwtid_idr);
 726         idr_destroy(&ctx->dev->stid_idr);
 727         idr_destroy(&ctx->dev->atid_idr);
 728         if (ctx->dev->rdev.bar2_kva)
 729                 iounmap(ctx->dev->rdev.bar2_kva);
 730         if (ctx->dev->rdev.oc_mw_kva)
 731                 iounmap(ctx->dev->rdev.oc_mw_kva);
 732         ib_dealloc_device(&ctx->dev->ibdev);
 733         ctx->dev = NULL;
 734 }
 735
 736 static void c4iw_remove(struct uld_ctx *ctx)
 737 {
 738         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 739         c4iw_unregister_device(ctx->dev);
 740         c4iw_dealloc(ctx);
 741 }
 742
 743 static int rdma_supported(const struct cxgb4_lld_info *infop)
 744 {
 745         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 746                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 747                infop->vr->cq.size > 0;
 748 }
 749
 750 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 751 {
 752         struct c4iw_dev *devp;
 753         int ret;
 754
 755         if (!rdma_supported(infop)) {
 756                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 757                        pci_name(infop->pdev));
 758                 return ERR_PTR(-ENOSYS);
 759         }
 760         if (!ocqp_supported(infop))
 761                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 762                         pci_name(infop->pdev));
 763
 764         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 765         if (!devp) {
 766                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 767                 return ERR_PTR(-ENOMEM);
 768         }
 769         devp->rdev.lldi = *infop;
 770
 771         /*
 772          * For T5 devices, we map all of BAR2 with WC.
 773          * For T4 devices with onchip qp mem, we map only that part
 774          * of BAR2 with WC.
 775          */
 776         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 777         if (is_t5(devp->rdev.lldi.adapter_type)) {
 778                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 779                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 780                 if (!devp->rdev.bar2_kva) {
 781                         pr_err(MOD "Unable to ioremap BAR2\n");
 782                         ib_dealloc_device(&devp->ibdev);
 783                         return ERR_PTR(-EINVAL);
 784                 }
 785         } else if (ocqp_supported(infop)) {
 786                 devp->rdev.oc_mw_pa =
 787                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
 788                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
 789                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
 790                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 791                         devp->rdev.lldi.vr->ocq.size);
 792                 if (!devp->rdev.oc_mw_kva) {
 793                         pr_err(MOD "Unable to ioremap onchip mem\n");
 794                         ib_dealloc_device(&devp->ibdev);
 795                         return ERR_PTR(-EINVAL);
 796                 }
 797         }
 798
 799         PDBG(KERN_INFO MOD "ocq memory: "
 800                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 801                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 802                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 803
 804         ret = c4iw_rdev_open(&devp->rdev);
 805         if (ret) {
 806                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 807                 ib_dealloc_device(&devp->ibdev);
 808                 return ERR_PTR(ret);
 809         }
 810
 811         idr_init(&devp->cqidr);
 812         idr_init(&devp->qpidr);
 813         idr_init(&devp->mmidr);
 814         idr_init(&devp->hwtid_idr);
 815         idr_init(&devp->stid_idr);
 816         idr_init(&devp->atid_idr);
 817         spin_lock_init(&devp->lock);
 818         mutex_init(&devp->rdev.stats.lock);
 819         mutex_init(&devp->db_mutex);
 820         INIT_LIST_HEAD(&devp->db_fc_list);
 821
 822         if (c4iw_debugfs_root) {
 823                 devp->debugfs_root = debugfs_create_dir(
 824                                         pci_name(devp->rdev.lldi.pdev),
 825                                         c4iw_debugfs_root);
 826                 setup_debugfs(devp);
 827         }
 828
 829
 830         return devp;
 831 }
 832
 833 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 834 {
 835         struct uld_ctx *ctx;
 836         static int vers_printed;
 837         int i;
 838
 839         if (!vers_printed++)
 840                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
 841                         DRV_VERSION);
 842
 843         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 844         if (!ctx) {
 845                 ctx = ERR_PTR(-ENOMEM);
 846                 goto out;
 847         }
 848         ctx->lldi = *infop;
 849
 850         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 851              __func__, pci_name(ctx->lldi.pdev),
 852              ctx->lldi.nchan, ctx->lldi.nrxq,
 853              ctx->lldi.ntxq, ctx->lldi.nports);
 854
 855         mutex_lock(&dev_mutex);
 856         list_add_tail(&ctx->entry, &uld_ctx_list);
 857         mutex_unlock(&dev_mutex);
 858
 859         for (i = 0; i < ctx->lldi.nrxq; i++)
 860                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
 861 out:
 862         return ctx;
 863 }
 864
 865 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
 866                                                  const __be64 *rsp,
 867                                                  u32 pktshift)
 868 {
 869         struct sk_buff *skb;
 870
 871         /*
 872          * Allocate space for cpl_pass_accept_req which will be synthesized by
 873          * driver. Once the driver synthesizes the request the skb will go
 874          * through the regular cpl_pass_accept_req processing.
 875          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
 876          * cpl_rx_pkt.
 877          */
 878         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
 879                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
 880         if (unlikely(!skb))
 881                 return NULL;
 882
 883          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
 884                    sizeof(struct rss_header) - pktshift);
 885
 886         /*
 887          * This skb will contain:
 888          *   rss_header from the rspq descriptor (1 flit)
 889          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
 890          *   space for the difference between the size of an
 891          *      rx_pkt and pass_accept_req cpl (1 flit)
 892          *   the packet data from the gl
 893          */
 894         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
 895                                 sizeof(struct rss_header));
 896         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
 897                                        sizeof(struct cpl_pass_accept_req),
 898                                        gl->va + pktshift,
 899                                        gl->tot_len - pktshift);
 900         return skb;
 901 }
 902
 903 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
 904                            const __be64 *rsp)
 905 {
 906         unsigned int opcode = *(u8 *)rsp;
 907         struct sk_buff *skb;
 908
 909         if (opcode != CPL_RX_PKT)
 910                 goto out;
 911
 912         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
 913         if (skb == NULL)
 914                 goto out;
 915
 916         if (c4iw_handlers[opcode] == NULL) {
 917                 pr_info("%s no handler opcode 0x%x...\n", __func__,
 918                        opcode);
 919                 kfree_skb(skb);
 920                 goto out;
 921         }
 922         c4iw_handlers[opcode](dev, skb);
 923         return 1;
 924 out:
 925         return 0;
 926 }
 927
 928 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 929                         const struct pkt_gl *gl)
 930 {
 931         struct uld_ctx *ctx = handle;
 932         struct c4iw_dev *dev = ctx->dev;
 933         struct sk_buff *skb;
 934         u8 opcode;
 935
 936         if (gl == NULL) {
 937                 /* omit RSS and rsp_ctrl at end of descriptor */
 938                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 939
 940                 skb = alloc_skb(256, GFP_ATOMIC);
 941                 if (!skb)
 942                         goto nomem;
 943                 __skb_put(skb, len);
 944                 skb_copy_to_linear_data(skb, &rsp[1], len);
 945         } else if (gl == CXGB4_MSG_AN) {
 946                 const struct rsp_ctrl *rc = (void *)rsp;
 947
 948                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 949                 c4iw_ev_handler(dev, qid);
 950                 return 0;
 951         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
 952                 if (recv_rx_pkt(dev, gl, rsp))
 953                         return 0;
 954
 955                 pr_info("%s: unexpected FL contents at %p, " \
 956                        "RSS %#llx, FL %#llx, len %u\n",
 957                        pci_name(ctx->lldi.pdev), gl->va,
 958                        (unsigned long long)be64_to_cpu(*rsp),
 959                        (unsigned long long)be64_to_cpu(
 960                        *(__force __be64 *)gl->va),
 961                        gl->tot_len);
 962
 963                 return 0;
 964         } else {
 965                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
 966                 if (unlikely(!skb))
 967                         goto nomem;
 968         }
 969
 970         opcode = *(u8 *)rsp;
 971         if (c4iw_handlers[opcode]) {
 972                 c4iw_handlers[opcode](dev, skb);
 973         } else {
 974                 pr_info("%s no handler opcode 0x%x...\n", __func__,
 975                        opcode);
 976                 kfree_skb(skb);
 977         }
 978
 979         return 0;
 980 nomem:
 981         return -1;
 982 }
 983
 984 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 985 {
 986         struct uld_ctx *ctx = handle;
 987
 988         PDBG("%s new_state %u\n", __func__, new_state);
 989         switch (new_state) {
 990         case CXGB4_STATE_UP:
 991                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
 992                 if (!ctx->dev) {
 993                         int ret;
 994
 995                         ctx->dev = c4iw_alloc(&ctx->lldi);
 996                         if (IS_ERR(ctx->dev)) {
 997                                 printk(KERN_ERR MOD
 998                                        "%s: initialization failed: %ld\n",
 999                                        pci_name(ctx->lldi.pdev),
1000                                        PTR_ERR(ctx->dev));
1001                                 ctx->dev = NULL;
1002                                 break;
1003                         }
1004                         ret = c4iw_register_device(ctx->dev);
1005                         if (ret) {
1006                                 printk(KERN_ERR MOD
1007                                        "%s: RDMA registration failed: %d\n",
1008                                        pci_name(ctx->lldi.pdev), ret);
1009                                 c4iw_dealloc(ctx);
1010                         }
1011                 }
1012                 break;
1013         case CXGB4_STATE_DOWN:
1014                 printk(KERN_INFO MOD "%s: Down\n",
1015                        pci_name(ctx->lldi.pdev));
1016                 if (ctx->dev)
1017                         c4iw_remove(ctx);
1018                 break;
1019         case CXGB4_STATE_START_RECOVERY:
1020                 printk(KERN_INFO MOD "%s: Fatal Error\n",
1021                        pci_name(ctx->lldi.pdev));
1022                 if (ctx->dev) {
1023                         struct ib_event event;
1024
1025                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1026                         memset(&event, 0, sizeof event);
1027                         event.event  = IB_EVENT_DEVICE_FATAL;
1028                         event.device = &ctx->dev->ibdev;
1029                         ib_dispatch_event(&event);
1030                         c4iw_remove(ctx);
1031                 }
1032                 break;
1033         case CXGB4_STATE_DETACH:
1034                 printk(KERN_INFO MOD "%s: Detach\n",
1035                        pci_name(ctx->lldi.pdev));
1036                 if (ctx->dev)
1037                         c4iw_remove(ctx);
1038                 break;
1039         }
1040         return 0;
1041 }
1042
1043 static int disable_qp_db(int id, void *p, void *data)
1044 {
1045         struct c4iw_qp *qp = p;
1046
1047         t4_disable_wq_db(&qp->wq);
1048         return 0;
1049 }
1050
1051 static void stop_queues(struct uld_ctx *ctx)
1052 {
1053         unsigned long flags;
1054
1055         spin_lock_irqsave(&ctx->dev->lock, flags);
1056         ctx->dev->rdev.stats.db_state_transitions++;
1057         ctx->dev->db_state = STOPPED;
1058         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1059                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1060         else
1061                 ctx->dev->rdev.status_page->db_off = 1;
1062         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1063 }
1064
1065 static int enable_qp_db(int id, void *p, void *data)
1066 {
1067         struct c4iw_qp *qp = p;
1068
1069         t4_enable_wq_db(&qp->wq);
1070         return 0;
1071 }
1072
1073 static void resume_rc_qp(struct c4iw_qp *qp)
1074 {
1075         spin_lock(&qp->lock);
1076         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc,
1077                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1078         qp->wq.sq.wq_pidx_inc = 0;
1079         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
1080                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1081         qp->wq.rq.wq_pidx_inc = 0;
1082         spin_unlock(&qp->lock);
1083 }
1084
1085 static void resume_a_chunk(struct uld_ctx *ctx)
1086 {
1087         int i;
1088         struct c4iw_qp *qp;
1089
1090         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1091                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1092                                       db_fc_entry);
1093                 list_del_init(&qp->db_fc_entry);
1094                 resume_rc_qp(qp);
1095                 if (list_empty(&ctx->dev->db_fc_list))
1096                         break;
1097         }
1098 }
1099
1100 static void resume_queues(struct uld_ctx *ctx)
1101 {
1102         spin_lock_irq(&ctx->dev->lock);
1103         if (ctx->dev->db_state != STOPPED)
1104                 goto out;
1105         ctx->dev->db_state = FLOW_CONTROL;
1106         while (1) {
1107                 if (list_empty(&ctx->dev->db_fc_list)) {
1108                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1109                         ctx->dev->db_state = NORMAL;
1110                         ctx->dev->rdev.stats.db_state_transitions++;
1111                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1112                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1113                                              NULL);
1114                         } else {
1115                                 ctx->dev->rdev.status_page->db_off = 0;
1116                         }
1117                         break;
1118                 } else {
1119                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1120                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1121                                DB_FC_DRAIN_THRESH)) {
1122                                 resume_a_chunk(ctx);
1123                         }
1124                         if (!list_empty(&ctx->dev->db_fc_list)) {
1125                                 spin_unlock_irq(&ctx->dev->lock);
1126                                 if (DB_FC_RESUME_DELAY) {
1127                                         set_current_state(TASK_UNINTERRUPTIBLE);
1128                                         schedule_timeout(DB_FC_RESUME_DELAY);
1129                                 }
1130                                 spin_lock_irq(&ctx->dev->lock);
1131                                 if (ctx->dev->db_state != FLOW_CONTROL)
1132                                         break;
1133                         }
1134                 }
1135         }
1136 out:
1137         if (ctx->dev->db_state != NORMAL)
1138                 ctx->dev->rdev.stats.db_fc_interruptions++;
1139         spin_unlock_irq(&ctx->dev->lock);
1140 }
1141
1142 struct qp_list {
1143         unsigned idx;
1144         struct c4iw_qp **qps;
1145 };
1146
1147 static int add_and_ref_qp(int id, void *p, void *data)
1148 {
1149         struct qp_list *qp_listp = data;
1150         struct c4iw_qp *qp = p;
1151
1152         c4iw_qp_add_ref(&qp->ibqp);
1153         qp_listp->qps[qp_listp->idx++] = qp;
1154         return 0;
1155 }
1156
1157 static int count_qps(int id, void *p, void *data)
1158 {
1159         unsigned *countp = data;
1160         (*countp)++;
1161         return 0;
1162 }
1163
1164 static void deref_qps(struct qp_list *qp_list)
1165 {
1166         int idx;
1167
1168         for (idx = 0; idx < qp_list->idx; idx++)
1169                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1170 }
1171
1172 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1173 {
1174         int idx;
1175         int ret;
1176
1177         for (idx = 0; idx < qp_list->idx; idx++) {
1178                 struct c4iw_qp *qp = qp_list->qps[idx];
1179
1180                 spin_lock_irq(&qp->rhp->lock);
1181                 spin_lock(&qp->lock);
1182                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1183                                           qp->wq.sq.qid,
1184                                           t4_sq_host_wq_pidx(&qp->wq),
1185                                           t4_sq_wq_size(&qp->wq));
1186                 if (ret) {
1187                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1188                                "DB overflow recovery failed - "
1189                                "error syncing SQ qid %u\n",
1190                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1191                         spin_unlock(&qp->lock);
1192                         spin_unlock_irq(&qp->rhp->lock);
1193                         return;
1194                 }
1195                 qp->wq.sq.wq_pidx_inc = 0;
1196
1197                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1198                                           qp->wq.rq.qid,
1199                                           t4_rq_host_wq_pidx(&qp->wq),
1200                                           t4_rq_wq_size(&qp->wq));
1201
1202                 if (ret) {
1203                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1204                                "DB overflow recovery failed - "
1205                                "error syncing RQ qid %u\n",
1206                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1207                         spin_unlock(&qp->lock);
1208                         spin_unlock_irq(&qp->rhp->lock);
1209                         return;
1210                 }
1211                 qp->wq.rq.wq_pidx_inc = 0;
1212                 spin_unlock(&qp->lock);
1213                 spin_unlock_irq(&qp->rhp->lock);
1214
1215                 /* Wait for the dbfifo to drain */
1216                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1217                         set_current_state(TASK_UNINTERRUPTIBLE);
1218                         schedule_timeout(usecs_to_jiffies(10));
1219                 }
1220         }
1221 }
1222
1223 static void recover_queues(struct uld_ctx *ctx)
1224 {
1225         int count = 0;
1226         struct qp_list qp_list;
1227         int ret;
1228
1229         /* slow everybody down */
1230         set_current_state(TASK_UNINTERRUPTIBLE);
1231         schedule_timeout(usecs_to_jiffies(1000));
1232
1233         /* flush the SGE contexts */
1234         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1235         if (ret) {
1236                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1237                        pci_name(ctx->lldi.pdev));
1238                 return;
1239         }
1240
1241         /* Count active queues so we can build a list of queues to recover */
1242         spin_lock_irq(&ctx->dev->lock);
1243         WARN_ON(ctx->dev->db_state != STOPPED);
1244         ctx->dev->db_state = RECOVERY;
1245         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1246
1247         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1248         if (!qp_list.qps) {
1249                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1250                        pci_name(ctx->lldi.pdev));
1251                 spin_unlock_irq(&ctx->dev->lock);
1252                 return;
1253         }
1254         qp_list.idx = 0;
1255
1256         /* add and ref each qp so it doesn't get freed */
1257         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1258
1259         spin_unlock_irq(&ctx->dev->lock);
1260
1261         /* now traverse the list in a safe context to recover the db state*/
1262         recover_lost_dbs(ctx, &qp_list);
1263
1264         /* we're almost done!  deref the qps and clean up */
1265         deref_qps(&qp_list);
1266         kfree(qp_list.qps);
1267
1268         spin_lock_irq(&ctx->dev->lock);
1269         WARN_ON(ctx->dev->db_state != RECOVERY);
1270         ctx->dev->db_state = STOPPED;
1271         spin_unlock_irq(&ctx->dev->lock);
1272 }
1273
1274 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1275 {
1276         struct uld_ctx *ctx = handle;
1277
1278         switch (control) {
1279         case CXGB4_CONTROL_DB_FULL:
1280                 stop_queues(ctx);
1281                 ctx->dev->rdev.stats.db_full++;
1282                 break;
1283         case CXGB4_CONTROL_DB_EMPTY:
1284                 resume_queues(ctx);
1285                 mutex_lock(&ctx->dev->rdev.stats.lock);
1286                 ctx->dev->rdev.stats.db_empty++;
1287                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1288                 break;
1289         case CXGB4_CONTROL_DB_DROP:
1290                 recover_queues(ctx);
1291                 mutex_lock(&ctx->dev->rdev.stats.lock);
1292                 ctx->dev->rdev.stats.db_drop++;
1293                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1294                 break;
1295         default:
1296                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1297                        pci_name(ctx->lldi.pdev), control);
1298                 break;
1299         }
1300         return 0;
1301 }
1302
1303 static struct cxgb4_uld_info c4iw_uld_info = {
1304         .name = DRV_NAME,
1305         .add = c4iw_uld_add,
1306         .rx_handler = c4iw_uld_rx_handler,
1307         .state_change = c4iw_uld_state_change,
1308         .control = c4iw_uld_control,
1309 };
1310
1311 static int __init c4iw_init_module(void)
1312 {
1313         int err;
1314
1315         err = c4iw_cm_init();
1316         if (err)
1317                 return err;
1318
1319         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1320         if (!c4iw_debugfs_root)
1321                 printk(KERN_WARNING MOD
1322                        "could not create debugfs entry, continuing\n");
1323
1324         if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1325                             c4iw_nl_cb_table))
1326                 pr_err("%s[%u]: Failed to add netlink callback\n"
1327                        , __func__, __LINE__);
1328
1329         err = iwpm_init(RDMA_NL_C4IW);
1330         if (err) {
1331                 pr_err("port mapper initialization failed with %d\n", err);
1332                 ibnl_remove_client(RDMA_NL_C4IW);
1333                 c4iw_cm_term();
1334                 debugfs_remove_recursive(c4iw_debugfs_root);
1335                 return err;
1336         }
1337
1338         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1339
1340         return 0;
1341 }
1342
1343 static void __exit c4iw_exit_module(void)
1344 {
1345         struct uld_ctx *ctx, *tmp;
1346
1347         mutex_lock(&dev_mutex);
1348         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1349                 if (ctx->dev)
1350                         c4iw_remove(ctx);
1351                 kfree(ctx);
1352         }
1353         mutex_unlock(&dev_mutex);
1354         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1355         iwpm_exit(RDMA_NL_C4IW);
1356         ibnl_remove_client(RDMA_NL_C4IW);
1357         c4iw_cm_term();
1358         debugfs_remove_recursive(c4iw_debugfs_root);
1359 }
1360
1361 module_init(c4iw_init_module);
1362 module_exit(c4iw_exit_module);