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 static struct dentry *c4iw_debugfs_root;
  68
  69 struct c4iw_debugfs_data {
  70         struct c4iw_dev *devp;
  71         char *buf;
  72         int bufsize;
  73         int pos;
  74 };
  75
  76 static int count_idrs(int id, void *p, void *data)
  77 {
  78         int *countp = data;
  79
  80         *countp = *countp + 1;
  81         return 0;
  82 }
  83
  84 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  85                             loff_t *ppos)
  86 {
  87         struct c4iw_debugfs_data *d = file->private_data;
  88
  89         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
  90 }
  91
  92 static int dump_qp(int id, void *p, void *data)
  93 {
  94         struct c4iw_qp *qp = p;
  95         struct c4iw_debugfs_data *qpd = data;
  96         int space;
  97         int cc;
  98
  99         if (id != qp->wq.sq.qid)
 100                 return 0;
 101
 102         space = qpd->bufsize - qpd->pos - 1;
 103         if (space == 0)
 104                 return 1;
 105
 106         if (qp->ep) {
 107                 if (qp->ep->com.local_addr.ss_family == AF_INET) {
 108                         struct sockaddr_in *lsin = (struct sockaddr_in *)
 109                                 &qp->ep->com.local_addr;
 110                         struct sockaddr_in *rsin = (struct sockaddr_in *)
 111                                 &qp->ep->com.remote_addr;
 112
 113                         cc = snprintf(qpd->buf + qpd->pos, space,
 114                                       "rc qp sq id %u rq id %u state %u "
 115                                       "onchip %u ep tid %u state %u "
 116                                       "%pI4:%u->%pI4:%u\n",
 117                                       qp->wq.sq.qid, qp->wq.rq.qid,
 118                                       (int)qp->attr.state,
 119                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 120                                       qp->ep->hwtid, (int)qp->ep->com.state,
 121                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 122                                       &rsin->sin_addr, ntohs(rsin->sin_port));
 123                 } else {
 124                         struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 125                                 &qp->ep->com.local_addr;
 126                         struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 127                                 &qp->ep->com.remote_addr;
 128
 129                         cc = snprintf(qpd->buf + qpd->pos, space,
 130                                       "rc qp sq id %u rq id %u state %u "
 131                                       "onchip %u ep tid %u state %u "
 132                                       "%pI6:%u->%pI6:%u\n",
 133                                       qp->wq.sq.qid, qp->wq.rq.qid,
 134                                       (int)qp->attr.state,
 135                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 136                                       qp->ep->hwtid, (int)qp->ep->com.state,
 137                                       &lsin6->sin6_addr,
 138                                       ntohs(lsin6->sin6_port),
 139                                       &rsin6->sin6_addr,
 140                                       ntohs(rsin6->sin6_port));
 141                 }
 142         } else
 143                 cc = snprintf(qpd->buf + qpd->pos, space,
 144                              "qp sq id %u rq id %u state %u onchip %u\n",
 145                               qp->wq.sq.qid, qp->wq.rq.qid,
 146                               (int)qp->attr.state,
 147                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 148         if (cc < space)
 149                 qpd->pos += cc;
 150         return 0;
 151 }
 152
 153 static int qp_release(struct inode *inode, struct file *file)
 154 {
 155         struct c4iw_debugfs_data *qpd = file->private_data;
 156         if (!qpd) {
 157                 printk(KERN_INFO "%s null qpd?\n", __func__);
 158                 return 0;
 159         }
 160         vfree(qpd->buf);
 161         kfree(qpd);
 162         return 0;
 163 }
 164
 165 static int qp_open(struct inode *inode, struct file *file)
 166 {
 167         struct c4iw_debugfs_data *qpd;
 168         int ret = 0;
 169         int count = 1;
 170
 171         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 172         if (!qpd) {
 173                 ret = -ENOMEM;
 174                 goto out;
 175         }
 176         qpd->devp = inode->i_private;
 177         qpd->pos = 0;
 178
 179         spin_lock_irq(&qpd->devp->lock);
 180         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 181         spin_unlock_irq(&qpd->devp->lock);
 182
 183         qpd->bufsize = count * 128;
 184         qpd->buf = vmalloc(qpd->bufsize);
 185         if (!qpd->buf) {
 186                 ret = -ENOMEM;
 187                 goto err1;
 188         }
 189
 190         spin_lock_irq(&qpd->devp->lock);
 191         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 192         spin_unlock_irq(&qpd->devp->lock);
 193
 194         qpd->buf[qpd->pos++] = 0;
 195         file->private_data = qpd;
 196         goto out;
 197 err1:
 198         kfree(qpd);
 199 out:
 200         return ret;
 201 }
 202
 203 static const struct file_operations qp_debugfs_fops = {
 204         .owner   = THIS_MODULE,
 205         .open    = qp_open,
 206         .release = qp_release,
 207         .read    = debugfs_read,
 208         .llseek  = default_llseek,
 209 };
 210
 211 static int dump_stag(int id, void *p, void *data)
 212 {
 213         struct c4iw_debugfs_data *stagd = data;
 214         int space;
 215         int cc;
 216
 217         space = stagd->bufsize - stagd->pos - 1;
 218         if (space == 0)
 219                 return 1;
 220
 221         cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
 222         if (cc < space)
 223                 stagd->pos += cc;
 224         return 0;
 225 }
 226
 227 static int stag_release(struct inode *inode, struct file *file)
 228 {
 229         struct c4iw_debugfs_data *stagd = file->private_data;
 230         if (!stagd) {
 231                 printk(KERN_INFO "%s null stagd?\n", __func__);
 232                 return 0;
 233         }
 234         kfree(stagd->buf);
 235         kfree(stagd);
 236         return 0;
 237 }
 238
 239 static int stag_open(struct inode *inode, struct file *file)
 240 {
 241         struct c4iw_debugfs_data *stagd;
 242         int ret = 0;
 243         int count = 1;
 244
 245         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 246         if (!stagd) {
 247                 ret = -ENOMEM;
 248                 goto out;
 249         }
 250         stagd->devp = inode->i_private;
 251         stagd->pos = 0;
 252
 253         spin_lock_irq(&stagd->devp->lock);
 254         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 255         spin_unlock_irq(&stagd->devp->lock);
 256
 257         stagd->bufsize = count * sizeof("0x12345678\n");
 258         stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
 259         if (!stagd->buf) {
 260                 ret = -ENOMEM;
 261                 goto err1;
 262         }
 263
 264         spin_lock_irq(&stagd->devp->lock);
 265         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 266         spin_unlock_irq(&stagd->devp->lock);
 267
 268         stagd->buf[stagd->pos++] = 0;
 269         file->private_data = stagd;
 270         goto out;
 271 err1:
 272         kfree(stagd);
 273 out:
 274         return ret;
 275 }
 276
 277 static const struct file_operations stag_debugfs_fops = {
 278         .owner   = THIS_MODULE,
 279         .open    = stag_open,
 280         .release = stag_release,
 281         .read    = debugfs_read,
 282         .llseek  = default_llseek,
 283 };
 284
 285 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY"};
 286
 287 static int stats_show(struct seq_file *seq, void *v)
 288 {
 289         struct c4iw_dev *dev = seq->private;
 290
 291         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 292                    "Max", "Fail");
 293         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 294                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 295                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 296         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 297                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 298                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 299         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 300                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 301                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 302         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 303                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 304                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 305         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 306                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 307                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 308         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 309                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 310                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 311         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 312         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 313         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 314         seq_printf(seq, " DB State: %s Transitions %llu\n",
 315                    db_state_str[dev->db_state],
 316                    dev->rdev.stats.db_state_transitions);
 317         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 318         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 319                    dev->rdev.stats.act_ofld_conn_fails);
 320         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 321                    dev->rdev.stats.pas_ofld_conn_fails);
 322         return 0;
 323 }
 324
 325 static int stats_open(struct inode *inode, struct file *file)
 326 {
 327         return single_open(file, stats_show, inode->i_private);
 328 }
 329
 330 static ssize_t stats_clear(struct file *file, const char __user *buf,
 331                 size_t count, loff_t *pos)
 332 {
 333         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 334
 335         mutex_lock(&dev->rdev.stats.lock);
 336         dev->rdev.stats.pd.max = 0;
 337         dev->rdev.stats.pd.fail = 0;
 338         dev->rdev.stats.qid.max = 0;
 339         dev->rdev.stats.qid.fail = 0;
 340         dev->rdev.stats.stag.max = 0;
 341         dev->rdev.stats.stag.fail = 0;
 342         dev->rdev.stats.pbl.max = 0;
 343         dev->rdev.stats.pbl.fail = 0;
 344         dev->rdev.stats.rqt.max = 0;
 345         dev->rdev.stats.rqt.fail = 0;
 346         dev->rdev.stats.ocqp.max = 0;
 347         dev->rdev.stats.ocqp.fail = 0;
 348         dev->rdev.stats.db_full = 0;
 349         dev->rdev.stats.db_empty = 0;
 350         dev->rdev.stats.db_drop = 0;
 351         dev->rdev.stats.db_state_transitions = 0;
 352         dev->rdev.stats.tcam_full = 0;
 353         dev->rdev.stats.act_ofld_conn_fails = 0;
 354         dev->rdev.stats.pas_ofld_conn_fails = 0;
 355         mutex_unlock(&dev->rdev.stats.lock);
 356         return count;
 357 }
 358
 359 static const struct file_operations stats_debugfs_fops = {
 360         .owner   = THIS_MODULE,
 361         .open    = stats_open,
 362         .release = single_release,
 363         .read    = seq_read,
 364         .llseek  = seq_lseek,
 365         .write   = stats_clear,
 366 };
 367
 368 static int dump_ep(int id, void *p, void *data)
 369 {
 370         struct c4iw_ep *ep = p;
 371         struct c4iw_debugfs_data *epd = data;
 372         int space;
 373         int cc;
 374
 375         space = epd->bufsize - epd->pos - 1;
 376         if (space == 0)
 377                 return 1;
 378
 379         if (ep->com.local_addr.ss_family == AF_INET) {
 380                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 381                         &ep->com.local_addr;
 382                 struct sockaddr_in *rsin = (struct sockaddr_in *)
 383                         &ep->com.remote_addr;
 384
 385                 cc = snprintf(epd->buf + epd->pos, space,
 386                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 387                               "history 0x%lx hwtid %d atid %d "
 388                               "%pI4:%d <-> %pI4:%d\n",
 389                               ep, ep->com.cm_id, ep->com.qp,
 390                               (int)ep->com.state, ep->com.flags,
 391                               ep->com.history, ep->hwtid, ep->atid,
 392                               &lsin->sin_addr, ntohs(lsin->sin_port),
 393                               &rsin->sin_addr, ntohs(rsin->sin_port));
 394         } else {
 395                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 396                         &ep->com.local_addr;
 397                 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 398                         &ep->com.remote_addr;
 399
 400                 cc = snprintf(epd->buf + epd->pos, space,
 401                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 402                               "history 0x%lx hwtid %d atid %d "
 403                               "%pI6:%d <-> %pI6:%d\n",
 404                               ep, ep->com.cm_id, ep->com.qp,
 405                               (int)ep->com.state, ep->com.flags,
 406                               ep->com.history, ep->hwtid, ep->atid,
 407                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 408                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port));
 409         }
 410         if (cc < space)
 411                 epd->pos += cc;
 412         return 0;
 413 }
 414
 415 static int dump_listen_ep(int id, void *p, void *data)
 416 {
 417         struct c4iw_listen_ep *ep = p;
 418         struct c4iw_debugfs_data *epd = data;
 419         int space;
 420         int cc;
 421
 422         space = epd->bufsize - epd->pos - 1;
 423         if (space == 0)
 424                 return 1;
 425
 426         if (ep->com.local_addr.ss_family == AF_INET) {
 427                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 428                         &ep->com.local_addr;
 429
 430                 cc = snprintf(epd->buf + epd->pos, space,
 431                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 432                               "backlog %d %pI4:%d\n",
 433                               ep, ep->com.cm_id, (int)ep->com.state,
 434                               ep->com.flags, ep->stid, ep->backlog,
 435                               &lsin->sin_addr, ntohs(lsin->sin_port));
 436         } else {
 437                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 438                         &ep->com.local_addr;
 439
 440                 cc = snprintf(epd->buf + epd->pos, space,
 441                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 442                               "backlog %d %pI6:%d\n",
 443                               ep, ep->com.cm_id, (int)ep->com.state,
 444                               ep->com.flags, ep->stid, ep->backlog,
 445                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port));
 446         }
 447         if (cc < space)
 448                 epd->pos += cc;
 449         return 0;
 450 }
 451
 452 static int ep_release(struct inode *inode, struct file *file)
 453 {
 454         struct c4iw_debugfs_data *epd = file->private_data;
 455         if (!epd) {
 456                 pr_info("%s null qpd?\n", __func__);
 457                 return 0;
 458         }
 459         vfree(epd->buf);
 460         kfree(epd);
 461         return 0;
 462 }
 463
 464 static int ep_open(struct inode *inode, struct file *file)
 465 {
 466         struct c4iw_debugfs_data *epd;
 467         int ret = 0;
 468         int count = 1;
 469
 470         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 471         if (!epd) {
 472                 ret = -ENOMEM;
 473                 goto out;
 474         }
 475         epd->devp = inode->i_private;
 476         epd->pos = 0;
 477
 478         spin_lock_irq(&epd->devp->lock);
 479         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 480         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 481         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 482         spin_unlock_irq(&epd->devp->lock);
 483
 484         epd->bufsize = count * 160;
 485         epd->buf = vmalloc(epd->bufsize);
 486         if (!epd->buf) {
 487                 ret = -ENOMEM;
 488                 goto err1;
 489         }
 490
 491         spin_lock_irq(&epd->devp->lock);
 492         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 493         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 494         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 495         spin_unlock_irq(&epd->devp->lock);
 496
 497         file->private_data = epd;
 498         goto out;
 499 err1:
 500         kfree(epd);
 501 out:
 502         return ret;
 503 }
 504
 505 static const struct file_operations ep_debugfs_fops = {
 506         .owner   = THIS_MODULE,
 507         .open    = ep_open,
 508         .release = ep_release,
 509         .read    = debugfs_read,
 510 };
 511
 512 static int setup_debugfs(struct c4iw_dev *devp)
 513 {
 514         struct dentry *de;
 515
 516         if (!devp->debugfs_root)
 517                 return -1;
 518
 519         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 520                                  (void *)devp, &qp_debugfs_fops);
 521         if (de && de->d_inode)
 522                 de->d_inode->i_size = 4096;
 523
 524         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 525                                  (void *)devp, &stag_debugfs_fops);
 526         if (de && de->d_inode)
 527                 de->d_inode->i_size = 4096;
 528
 529         de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
 530                         (void *)devp, &stats_debugfs_fops);
 531         if (de && de->d_inode)
 532                 de->d_inode->i_size = 4096;
 533
 534         de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
 535                         (void *)devp, &ep_debugfs_fops);
 536         if (de && de->d_inode)
 537                 de->d_inode->i_size = 4096;
 538
 539         return 0;
 540 }
 541
 542 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 543                                struct c4iw_dev_ucontext *uctx)
 544 {
 545         struct list_head *pos, *nxt;
 546         struct c4iw_qid_list *entry;
 547
 548         mutex_lock(&uctx->lock);
 549         list_for_each_safe(pos, nxt, &uctx->qpids) {
 550                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 551                 list_del_init(&entry->entry);
 552                 if (!(entry->qid & rdev->qpmask)) {
 553                         c4iw_put_resource(&rdev->resource.qid_table,
 554                                           entry->qid);
 555                         mutex_lock(&rdev->stats.lock);
 556                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 557                         mutex_unlock(&rdev->stats.lock);
 558                 }
 559                 kfree(entry);
 560         }
 561
 562         list_for_each_safe(pos, nxt, &uctx->qpids) {
 563                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 564                 list_del_init(&entry->entry);
 565                 kfree(entry);
 566         }
 567         mutex_unlock(&uctx->lock);
 568 }
 569
 570 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 571                             struct c4iw_dev_ucontext *uctx)
 572 {
 573         INIT_LIST_HEAD(&uctx->qpids);
 574         INIT_LIST_HEAD(&uctx->cqids);
 575         mutex_init(&uctx->lock);
 576 }
 577
 578 /* Caller takes care of locking if needed */
 579 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 580 {
 581         int err;
 582
 583         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 584
 585         /*
 586          * qpshift is the number of bits to shift the qpid left in order
 587          * to get the correct address of the doorbell for that qp.
 588          */
 589         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 590         rdev->qpmask = rdev->lldi.udb_density - 1;
 591         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 592         rdev->cqmask = rdev->lldi.ucq_density - 1;
 593         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 594              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 595              "qp qid start %u size %u cq qid start %u size %u\n",
 596              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 597              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 598              rdev->lldi.vr->pbl.start,
 599              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 600              rdev->lldi.vr->rq.size,
 601              rdev->lldi.vr->qp.start,
 602              rdev->lldi.vr->qp.size,
 603              rdev->lldi.vr->cq.start,
 604              rdev->lldi.vr->cq.size);
 605         PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 606              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 607              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 608              (u64)pci_resource_start(rdev->lldi.pdev, 2),
 609              rdev->lldi.db_reg,
 610              rdev->lldi.gts_reg,
 611              rdev->qpshift, rdev->qpmask,
 612              rdev->cqshift, rdev->cqmask);
 613
 614         if (c4iw_num_stags(rdev) == 0) {
 615                 err = -EINVAL;
 616                 goto err1;
 617         }
 618
 619         rdev->stats.pd.total = T4_MAX_NUM_PD;
 620         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 621         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 622         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 623         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 624         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 625
 626         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 627         if (err) {
 628                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 629                 goto err1;
 630         }
 631         err = c4iw_pblpool_create(rdev);
 632         if (err) {
 633                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 634                 goto err2;
 635         }
 636         err = c4iw_rqtpool_create(rdev);
 637         if (err) {
 638                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 639                 goto err3;
 640         }
 641         err = c4iw_ocqp_pool_create(rdev);
 642         if (err) {
 643                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 644                 goto err4;
 645         }
 646         return 0;
 647 err4:
 648         c4iw_rqtpool_destroy(rdev);
 649 err3:
 650         c4iw_pblpool_destroy(rdev);
 651 err2:
 652         c4iw_destroy_resource(&rdev->resource);
 653 err1:
 654         return err;
 655 }
 656
 657 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 658 {
 659         c4iw_pblpool_destroy(rdev);
 660         c4iw_rqtpool_destroy(rdev);
 661         c4iw_destroy_resource(&rdev->resource);
 662 }
 663
 664 static void c4iw_dealloc(struct uld_ctx *ctx)
 665 {
 666         c4iw_rdev_close(&ctx->dev->rdev);
 667         idr_destroy(&ctx->dev->cqidr);
 668         idr_destroy(&ctx->dev->qpidr);
 669         idr_destroy(&ctx->dev->mmidr);
 670         idr_destroy(&ctx->dev->hwtid_idr);
 671         idr_destroy(&ctx->dev->stid_idr);
 672         idr_destroy(&ctx->dev->atid_idr);
 673         iounmap(ctx->dev->rdev.oc_mw_kva);
 674         ib_dealloc_device(&ctx->dev->ibdev);
 675         ctx->dev = NULL;
 676 }
 677
 678 static void c4iw_remove(struct uld_ctx *ctx)
 679 {
 680         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 681         c4iw_unregister_device(ctx->dev);
 682         c4iw_dealloc(ctx);
 683 }
 684
 685 static int rdma_supported(const struct cxgb4_lld_info *infop)
 686 {
 687         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 688                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 689                infop->vr->cq.size > 0;
 690 }
 691
 692 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 693 {
 694         struct c4iw_dev *devp;
 695         int ret;
 696
 697         if (!rdma_supported(infop)) {
 698                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 699                        pci_name(infop->pdev));
 700                 return ERR_PTR(-ENOSYS);
 701         }
 702         if (!ocqp_supported(infop))
 703                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 704                         pci_name(infop->pdev));
 705
 706         if (!is_t4(infop->adapter_type)) {
 707                 if (!allow_db_fc_on_t5) {
 708                         db_fc_threshold = 100000;
 709                         pr_info("DB Flow Control Disabled.\n");
 710                 }
 711
 712                 if (!allow_db_coalescing_on_t5) {
 713                         db_coalescing_threshold = -1;
 714                         pr_info("DB Coalescing Disabled.\n");
 715                 }
 716         }
 717
 718         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 719         if (!devp) {
 720                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 721                 return ERR_PTR(-ENOMEM);
 722         }
 723         devp->rdev.lldi = *infop;
 724
 725         devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
 726                 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
 727                  roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
 728         devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 729                                                devp->rdev.lldi.vr->ocq.size);
 730
 731         PDBG(KERN_INFO MOD "ocq memory: "
 732                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 733                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 734                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 735
 736         ret = c4iw_rdev_open(&devp->rdev);
 737         if (ret) {
 738                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 739                 ib_dealloc_device(&devp->ibdev);
 740                 return ERR_PTR(ret);
 741         }
 742
 743         idr_init(&devp->cqidr);
 744         idr_init(&devp->qpidr);
 745         idr_init(&devp->mmidr);
 746         idr_init(&devp->hwtid_idr);
 747         idr_init(&devp->stid_idr);
 748         idr_init(&devp->atid_idr);
 749         spin_lock_init(&devp->lock);
 750         mutex_init(&devp->rdev.stats.lock);
 751         mutex_init(&devp->db_mutex);
 752
 753         if (c4iw_debugfs_root) {
 754                 devp->debugfs_root = debugfs_create_dir(
 755                                         pci_name(devp->rdev.lldi.pdev),
 756                                         c4iw_debugfs_root);
 757                 setup_debugfs(devp);
 758         }
 759         return devp;
 760 }
 761
 762 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 763 {
 764         struct uld_ctx *ctx;
 765         static int vers_printed;
 766         int i;
 767
 768         if (!vers_printed++)
 769                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
 770                         DRV_VERSION);
 771
 772         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 773         if (!ctx) {
 774                 ctx = ERR_PTR(-ENOMEM);
 775                 goto out;
 776         }
 777         ctx->lldi = *infop;
 778
 779         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 780              __func__, pci_name(ctx->lldi.pdev),
 781              ctx->lldi.nchan, ctx->lldi.nrxq,
 782              ctx->lldi.ntxq, ctx->lldi.nports);
 783
 784         mutex_lock(&dev_mutex);
 785         list_add_tail(&ctx->entry, &uld_ctx_list);
 786         mutex_unlock(&dev_mutex);
 787
 788         for (i = 0; i < ctx->lldi.nrxq; i++)
 789                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
 790 out:
 791         return ctx;
 792 }
 793
 794 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
 795                                                  const __be64 *rsp,
 796                                                  u32 pktshift)
 797 {
 798         struct sk_buff *skb;
 799
 800         /*
 801          * Allocate space for cpl_pass_accept_req which will be synthesized by
 802          * driver. Once the driver synthesizes the request the skb will go
 803          * through the regular cpl_pass_accept_req processing.
 804          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
 805          * cpl_rx_pkt.
 806          */
 807         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
 808                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
 809         if (unlikely(!skb))
 810                 return NULL;
 811
 812          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
 813                    sizeof(struct rss_header) - pktshift);
 814
 815         /*
 816          * This skb will contain:
 817          *   rss_header from the rspq descriptor (1 flit)
 818          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
 819          *   space for the difference between the size of an
 820          *      rx_pkt and pass_accept_req cpl (1 flit)
 821          *   the packet data from the gl
 822          */
 823         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
 824                                 sizeof(struct rss_header));
 825         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
 826                                        sizeof(struct cpl_pass_accept_req),
 827                                        gl->va + pktshift,
 828                                        gl->tot_len - pktshift);
 829         return skb;
 830 }
 831
 832 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
 833                            const __be64 *rsp)
 834 {
 835         unsigned int opcode = *(u8 *)rsp;
 836         struct sk_buff *skb;
 837
 838         if (opcode != CPL_RX_PKT)
 839                 goto out;
 840
 841         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
 842         if (skb == NULL)
 843                 goto out;
 844
 845         if (c4iw_handlers[opcode] == NULL) {
 846                 pr_info("%s no handler opcode 0x%x...\n", __func__,
 847                        opcode);
 848                 kfree_skb(skb);
 849                 goto out;
 850         }
 851         c4iw_handlers[opcode](dev, skb);
 852         return 1;
 853 out:
 854         return 0;
 855 }
 856
 857 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 858                         const struct pkt_gl *gl)
 859 {
 860         struct uld_ctx *ctx = handle;
 861         struct c4iw_dev *dev = ctx->dev;
 862         struct sk_buff *skb;
 863         u8 opcode;
 864
 865         if (gl == NULL) {
 866                 /* omit RSS and rsp_ctrl at end of descriptor */
 867                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 868
 869                 skb = alloc_skb(256, GFP_ATOMIC);
 870                 if (!skb)
 871                         goto nomem;
 872                 __skb_put(skb, len);
 873                 skb_copy_to_linear_data(skb, &rsp[1], len);
 874         } else if (gl == CXGB4_MSG_AN) {
 875                 const struct rsp_ctrl *rc = (void *)rsp;
 876
 877                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 878                 c4iw_ev_handler(dev, qid);
 879                 return 0;
 880         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
 881                 if (recv_rx_pkt(dev, gl, rsp))
 882                         return 0;
 883
 884                 pr_info("%s: unexpected FL contents at %p, " \
 885                        "RSS %#llx, FL %#llx, len %u\n",
 886                        pci_name(ctx->lldi.pdev), gl->va,
 887                        (unsigned long long)be64_to_cpu(*rsp),
 888                        (unsigned long long)be64_to_cpu(
 889                        *(__force __be64 *)gl->va),
 890                        gl->tot_len);
 891
 892                 return 0;
 893         } else {
 894                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
 895                 if (unlikely(!skb))
 896                         goto nomem;
 897         }
 898
 899         opcode = *(u8 *)rsp;
 900         if (c4iw_handlers[opcode])
 901                 c4iw_handlers[opcode](dev, skb);
 902         else
 903                 pr_info("%s no handler opcode 0x%x...\n", __func__,
 904                        opcode);
 905
 906         return 0;
 907 nomem:
 908         return -1;
 909 }
 910
 911 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 912 {
 913         struct uld_ctx *ctx = handle;
 914
 915         PDBG("%s new_state %u\n", __func__, new_state);
 916         switch (new_state) {
 917         case CXGB4_STATE_UP:
 918                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
 919                 if (!ctx->dev) {
 920                         int ret;
 921
 922                         ctx->dev = c4iw_alloc(&ctx->lldi);
 923                         if (IS_ERR(ctx->dev)) {
 924                                 printk(KERN_ERR MOD
 925                                        "%s: initialization failed: %ld\n",
 926                                        pci_name(ctx->lldi.pdev),
 927                                        PTR_ERR(ctx->dev));
 928                                 ctx->dev = NULL;
 929                                 break;
 930                         }
 931                         ret = c4iw_register_device(ctx->dev);
 932                         if (ret) {
 933                                 printk(KERN_ERR MOD
 934                                        "%s: RDMA registration failed: %d\n",
 935                                        pci_name(ctx->lldi.pdev), ret);
 936                                 c4iw_dealloc(ctx);
 937                         }
 938                 }
 939                 break;
 940         case CXGB4_STATE_DOWN:
 941                 printk(KERN_INFO MOD "%s: Down\n",
 942                        pci_name(ctx->lldi.pdev));
 943                 if (ctx->dev)
 944                         c4iw_remove(ctx);
 945                 break;
 946         case CXGB4_STATE_START_RECOVERY:
 947                 printk(KERN_INFO MOD "%s: Fatal Error\n",
 948                        pci_name(ctx->lldi.pdev));
 949                 if (ctx->dev) {
 950                         struct ib_event event;
 951
 952                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
 953                         memset(&event, 0, sizeof event);
 954                         event.event  = IB_EVENT_DEVICE_FATAL;
 955                         event.device = &ctx->dev->ibdev;
 956                         ib_dispatch_event(&event);
 957                         c4iw_remove(ctx);
 958                 }
 959                 break;
 960         case CXGB4_STATE_DETACH:
 961                 printk(KERN_INFO MOD "%s: Detach\n",
 962                        pci_name(ctx->lldi.pdev));
 963                 if (ctx->dev)
 964                         c4iw_remove(ctx);
 965                 break;
 966         }
 967         return 0;
 968 }
 969
 970 static int disable_qp_db(int id, void *p, void *data)
 971 {
 972         struct c4iw_qp *qp = p;
 973
 974         t4_disable_wq_db(&qp->wq);
 975         return 0;
 976 }
 977
 978 static void stop_queues(struct uld_ctx *ctx)
 979 {
 980         spin_lock_irq(&ctx->dev->lock);
 981         if (ctx->dev->db_state == NORMAL) {
 982                 ctx->dev->rdev.stats.db_state_transitions++;
 983                 ctx->dev->db_state = FLOW_CONTROL;
 984                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
 985         }
 986         spin_unlock_irq(&ctx->dev->lock);
 987 }
 988
 989 static int enable_qp_db(int id, void *p, void *data)
 990 {
 991         struct c4iw_qp *qp = p;
 992
 993         t4_enable_wq_db(&qp->wq);
 994         return 0;
 995 }
 996
 997 static void resume_queues(struct uld_ctx *ctx)
 998 {
 999         spin_lock_irq(&ctx->dev->lock);
1000         if (ctx->dev->qpcnt <= db_fc_threshold &&
1001             ctx->dev->db_state == FLOW_CONTROL) {
1002                 ctx->dev->db_state = NORMAL;
1003                 ctx->dev->rdev.stats.db_state_transitions++;
1004                 idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL);
1005         }
1006         spin_unlock_irq(&ctx->dev->lock);
1007 }
1008
1009 struct qp_list {
1010         unsigned idx;
1011         struct c4iw_qp **qps;
1012 };
1013
1014 static int add_and_ref_qp(int id, void *p, void *data)
1015 {
1016         struct qp_list *qp_listp = data;
1017         struct c4iw_qp *qp = p;
1018
1019         c4iw_qp_add_ref(&qp->ibqp);
1020         qp_listp->qps[qp_listp->idx++] = qp;
1021         return 0;
1022 }
1023
1024 static int count_qps(int id, void *p, void *data)
1025 {
1026         unsigned *countp = data;
1027         (*countp)++;
1028         return 0;
1029 }
1030
1031 static void deref_qps(struct qp_list qp_list)
1032 {
1033         int idx;
1034
1035         for (idx = 0; idx < qp_list.idx; idx++)
1036                 c4iw_qp_rem_ref(&qp_list.qps[idx]->ibqp);
1037 }
1038
1039 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1040 {
1041         int idx;
1042         int ret;
1043
1044         for (idx = 0; idx < qp_list->idx; idx++) {
1045                 struct c4iw_qp *qp = qp_list->qps[idx];
1046
1047                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1048                                           qp->wq.sq.qid,
1049                                           t4_sq_host_wq_pidx(&qp->wq),
1050                                           t4_sq_wq_size(&qp->wq));
1051                 if (ret) {
1052                         printk(KERN_ERR MOD "%s: Fatal error - "
1053                                "DB overflow recovery failed - "
1054                                "error syncing SQ qid %u\n",
1055                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1056                         return;
1057                 }
1058
1059                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1060                                           qp->wq.rq.qid,
1061                                           t4_rq_host_wq_pidx(&qp->wq),
1062                                           t4_rq_wq_size(&qp->wq));
1063
1064                 if (ret) {
1065                         printk(KERN_ERR MOD "%s: Fatal error - "
1066                                "DB overflow recovery failed - "
1067                                "error syncing RQ qid %u\n",
1068                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1069                         return;
1070                 }
1071
1072                 /* Wait for the dbfifo to drain */
1073                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1074                         set_current_state(TASK_UNINTERRUPTIBLE);
1075                         schedule_timeout(usecs_to_jiffies(10));
1076                 }
1077         }
1078 }
1079
1080 static void recover_queues(struct uld_ctx *ctx)
1081 {
1082         int count = 0;
1083         struct qp_list qp_list;
1084         int ret;
1085
1086         /* lock out kernel db ringers */
1087         mutex_lock(&ctx->dev->db_mutex);
1088
1089         /* put all queues in to recovery mode */
1090         spin_lock_irq(&ctx->dev->lock);
1091         ctx->dev->db_state = RECOVERY;
1092         ctx->dev->rdev.stats.db_state_transitions++;
1093         idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1094         spin_unlock_irq(&ctx->dev->lock);
1095
1096         /* slow everybody down */
1097         set_current_state(TASK_UNINTERRUPTIBLE);
1098         schedule_timeout(usecs_to_jiffies(1000));
1099
1100         /* Wait for the dbfifo to completely drain. */
1101         while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) {
1102                 set_current_state(TASK_UNINTERRUPTIBLE);
1103                 schedule_timeout(usecs_to_jiffies(10));
1104         }
1105
1106         /* flush the SGE contexts */
1107         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1108         if (ret) {
1109                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1110                        pci_name(ctx->lldi.pdev));
1111                 goto out;
1112         }
1113
1114         /* Count active queues so we can build a list of queues to recover */
1115         spin_lock_irq(&ctx->dev->lock);
1116         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1117
1118         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1119         if (!qp_list.qps) {
1120                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1121                        pci_name(ctx->lldi.pdev));
1122                 spin_unlock_irq(&ctx->dev->lock);
1123                 goto out;
1124         }
1125         qp_list.idx = 0;
1126
1127         /* add and ref each qp so it doesn't get freed */
1128         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1129
1130         spin_unlock_irq(&ctx->dev->lock);
1131
1132         /* now traverse the list in a safe context to recover the db state*/
1133         recover_lost_dbs(ctx, &qp_list);
1134
1135         /* we're almost done!  deref the qps and clean up */
1136         deref_qps(qp_list);
1137         kfree(qp_list.qps);
1138
1139         /* Wait for the dbfifo to completely drain again */
1140         while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) {
1141                 set_current_state(TASK_UNINTERRUPTIBLE);
1142                 schedule_timeout(usecs_to_jiffies(10));
1143         }
1144
1145         /* resume the queues */
1146         spin_lock_irq(&ctx->dev->lock);
1147         if (ctx->dev->qpcnt > db_fc_threshold)
1148                 ctx->dev->db_state = FLOW_CONTROL;
1149         else {
1150                 ctx->dev->db_state = NORMAL;
1151                 idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL);
1152         }
1153         ctx->dev->rdev.stats.db_state_transitions++;
1154         spin_unlock_irq(&ctx->dev->lock);
1155
1156 out:
1157         /* start up kernel db ringers again */
1158         mutex_unlock(&ctx->dev->db_mutex);
1159 }
1160
1161 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1162 {
1163         struct uld_ctx *ctx = handle;
1164
1165         switch (control) {
1166         case CXGB4_CONTROL_DB_FULL:
1167                 stop_queues(ctx);
1168                 mutex_lock(&ctx->dev->rdev.stats.lock);
1169                 ctx->dev->rdev.stats.db_full++;
1170                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1171                 break;
1172         case CXGB4_CONTROL_DB_EMPTY:
1173                 resume_queues(ctx);
1174                 mutex_lock(&ctx->dev->rdev.stats.lock);
1175                 ctx->dev->rdev.stats.db_empty++;
1176                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1177                 break;
1178         case CXGB4_CONTROL_DB_DROP:
1179                 recover_queues(ctx);
1180                 mutex_lock(&ctx->dev->rdev.stats.lock);
1181                 ctx->dev->rdev.stats.db_drop++;
1182                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1183                 break;
1184         default:
1185                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1186                        pci_name(ctx->lldi.pdev), control);
1187                 break;
1188         }
1189         return 0;
1190 }
1191
1192 static struct cxgb4_uld_info c4iw_uld_info = {
1193         .name = DRV_NAME,
1194         .add = c4iw_uld_add,
1195         .rx_handler = c4iw_uld_rx_handler,
1196         .state_change = c4iw_uld_state_change,
1197         .control = c4iw_uld_control,
1198 };
1199
1200 static int __init c4iw_init_module(void)
1201 {
1202         int err;
1203
1204         err = c4iw_cm_init();
1205         if (err)
1206                 return err;
1207
1208         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1209         if (!c4iw_debugfs_root)
1210                 printk(KERN_WARNING MOD
1211                        "could not create debugfs entry, continuing\n");
1212
1213         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1214
1215         return 0;
1216 }
1217
1218 static void __exit c4iw_exit_module(void)
1219 {
1220         struct uld_ctx *ctx, *tmp;
1221
1222         mutex_lock(&dev_mutex);
1223         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1224                 if (ctx->dev)
1225                         c4iw_remove(ctx);
1226                 kfree(ctx);
1227         }
1228         mutex_unlock(&dev_mutex);
1229         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1230         c4iw_cm_term();
1231         debugfs_remove_recursive(c4iw_debugfs_root);
1232 }
1233
1234 module_init(c4iw_init_module);
1235 module_exit(c4iw_exit_module);