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 #include <linux/math64.h>
  37
  38 #include <rdma/ib_verbs.h>
  39
  40 #include "iw_cxgb4.h"
  41
  42 #define DRV_VERSION "0.1"
  43
  44 MODULE_AUTHOR("Steve Wise");
  45 MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
  46 MODULE_LICENSE("Dual BSD/GPL");
  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 int c4iw_wr_log = 0;
  59 module_param(c4iw_wr_log, int, 0444);
  60 MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
  61
  62 static int c4iw_wr_log_size_order = 12;
  63 module_param(c4iw_wr_log_size_order, int, 0444);
  64 MODULE_PARM_DESC(c4iw_wr_log_size_order,
  65                  "Number of entries (log2) in the work request timing log.");
  66
  67 static LIST_HEAD(uld_ctx_list);
  68 static DEFINE_MUTEX(dev_mutex);
  69 static struct workqueue_struct *reg_workq;
  70
  71 #define DB_FC_RESUME_SIZE 64
  72 #define DB_FC_RESUME_DELAY 1
  73 #define DB_FC_DRAIN_THRESH 0
  74
  75 static struct dentry *c4iw_debugfs_root;
  76
  77 struct c4iw_debugfs_data {
  78         struct c4iw_dev *devp;
  79         char *buf;
  80         int bufsize;
  81         int pos;
  82 };
  83
  84 static int count_idrs(int id, void *p, void *data)
  85 {
  86         int *countp = data;
  87
  88         *countp = *countp + 1;
  89         return 0;
  90 }
  91
  92 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  93                             loff_t *ppos)
  94 {
  95         struct c4iw_debugfs_data *d = file->private_data;
  96
  97         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
  98 }
  99
 100 void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
 101 {
 102         struct wr_log_entry le;
 103         int idx;
 104
 105         if (!wq->rdev->wr_log)
 106                 return;
 107
 108         idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
 109                 (wq->rdev->wr_log_size - 1);
 110         le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
 111         le.poll_host_time = ktime_get();
 112         le.valid = 1;
 113         le.cqe_sge_ts = CQE_TS(cqe);
 114         if (SQ_TYPE(cqe)) {
 115                 le.qid = wq->sq.qid;
 116                 le.opcode = CQE_OPCODE(cqe);
 117                 le.post_host_time = wq->sq.sw_sq[wq->sq.cidx].host_time;
 118                 le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
 119                 le.wr_id = CQE_WRID_SQ_IDX(cqe);
 120         } else {
 121                 le.qid = wq->rq.qid;
 122                 le.opcode = FW_RI_RECEIVE;
 123                 le.post_host_time = wq->rq.sw_rq[wq->rq.cidx].host_time;
 124                 le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
 125                 le.wr_id = CQE_WRID_MSN(cqe);
 126         }
 127         wq->rdev->wr_log[idx] = le;
 128 }
 129
 130 static int wr_log_show(struct seq_file *seq, void *v)
 131 {
 132         struct c4iw_dev *dev = seq->private;
 133         ktime_t prev_time;
 134         struct wr_log_entry *lep;
 135         int prev_time_set = 0;
 136         int idx, end;
 137
 138 #define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
 139
 140         idx = atomic_read(&dev->rdev.wr_log_idx) &
 141                 (dev->rdev.wr_log_size - 1);
 142         end = idx - 1;
 143         if (end < 0)
 144                 end = dev->rdev.wr_log_size - 1;
 145         lep = &dev->rdev.wr_log[idx];
 146         while (idx != end) {
 147                 if (lep->valid) {
 148                         if (!prev_time_set) {
 149                                 prev_time_set = 1;
 150                                 prev_time = lep->poll_host_time;
 151                         }
 152                         seq_printf(seq, "%04u: nsec %llu qid %u opcode "
 153                                    "%u %s 0x%x host_wr_delta nsec %llu "
 154                                    "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
 155                                    "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
 156                                    "cqe_poll_delta_ns %llu\n",
 157                                    idx,
 158                                    ktime_to_ns(ktime_sub(lep->poll_host_time,
 159                                                          prev_time)),
 160                                    lep->qid, lep->opcode,
 161                                    lep->opcode == FW_RI_RECEIVE ?
 162                                                         "msn" : "wrid",
 163                                    lep->wr_id,
 164                                    ktime_to_ns(ktime_sub(lep->poll_host_time,
 165                                                          lep->post_host_time)),
 166                                    lep->post_sge_ts, lep->cqe_sge_ts,
 167                                    lep->poll_sge_ts,
 168                                    ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
 169                                    ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
 170                         prev_time = lep->poll_host_time;
 171                 }
 172                 idx++;
 173                 if (idx > (dev->rdev.wr_log_size - 1))
 174                         idx = 0;
 175                 lep = &dev->rdev.wr_log[idx];
 176         }
 177 #undef ts2ns
 178         return 0;
 179 }
 180
 181 static int wr_log_open(struct inode *inode, struct file *file)
 182 {
 183         return single_open(file, wr_log_show, inode->i_private);
 184 }
 185
 186 static ssize_t wr_log_clear(struct file *file, const char __user *buf,
 187                             size_t count, loff_t *pos)
 188 {
 189         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 190         int i;
 191
 192         if (dev->rdev.wr_log)
 193                 for (i = 0; i < dev->rdev.wr_log_size; i++)
 194                         dev->rdev.wr_log[i].valid = 0;
 195         return count;
 196 }
 197
 198 static const struct file_operations wr_log_debugfs_fops = {
 199         .owner   = THIS_MODULE,
 200         .open    = wr_log_open,
 201         .release = single_release,
 202         .read    = seq_read,
 203         .llseek  = seq_lseek,
 204         .write   = wr_log_clear,
 205 };
 206
 207 static struct sockaddr_in zero_sin = {
 208         .sin_family = AF_INET,
 209 };
 210
 211 static struct sockaddr_in6 zero_sin6 = {
 212         .sin6_family = AF_INET6,
 213 };
 214
 215 static void set_ep_sin_addrs(struct c4iw_ep *ep,
 216                              struct sockaddr_in **lsin,
 217                              struct sockaddr_in **rsin,
 218                              struct sockaddr_in **m_lsin,
 219                              struct sockaddr_in **m_rsin)
 220 {
 221         struct iw_cm_id *id = ep->com.cm_id;
 222
 223         *m_lsin = (struct sockaddr_in *)&ep->com.local_addr;
 224         *m_rsin = (struct sockaddr_in *)&ep->com.remote_addr;
 225         if (id) {
 226                 *lsin = (struct sockaddr_in *)&id->local_addr;
 227                 *rsin = (struct sockaddr_in *)&id->remote_addr;
 228         } else {
 229                 *lsin = &zero_sin;
 230                 *rsin = &zero_sin;
 231         }
 232 }
 233
 234 static void set_ep_sin6_addrs(struct c4iw_ep *ep,
 235                               struct sockaddr_in6 **lsin6,
 236                               struct sockaddr_in6 **rsin6,
 237                               struct sockaddr_in6 **m_lsin6,
 238                               struct sockaddr_in6 **m_rsin6)
 239 {
 240         struct iw_cm_id *id = ep->com.cm_id;
 241
 242         *m_lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
 243         *m_rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
 244         if (id) {
 245                 *lsin6 = (struct sockaddr_in6 *)&id->local_addr;
 246                 *rsin6 = (struct sockaddr_in6 *)&id->remote_addr;
 247         } else {
 248                 *lsin6 = &zero_sin6;
 249                 *rsin6 = &zero_sin6;
 250         }
 251 }
 252
 253 static int dump_qp(int id, void *p, void *data)
 254 {
 255         struct c4iw_qp *qp = p;
 256         struct c4iw_debugfs_data *qpd = data;
 257         int space;
 258         int cc;
 259
 260         if (id != qp->wq.sq.qid)
 261                 return 0;
 262
 263         space = qpd->bufsize - qpd->pos - 1;
 264         if (space == 0)
 265                 return 1;
 266
 267         if (qp->ep) {
 268                 struct c4iw_ep *ep = qp->ep;
 269
 270                 if (ep->com.local_addr.ss_family == AF_INET) {
 271                         struct sockaddr_in *lsin;
 272                         struct sockaddr_in *rsin;
 273                         struct sockaddr_in *m_lsin;
 274                         struct sockaddr_in *m_rsin;
 275
 276                         set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 277                         cc = snprintf(qpd->buf + qpd->pos, space,
 278                                       "rc qp sq id %u rq id %u state %u "
 279                                       "onchip %u ep tid %u state %u "
 280                                       "%pI4:%u/%u->%pI4:%u/%u\n",
 281                                       qp->wq.sq.qid, qp->wq.rq.qid,
 282                                       (int)qp->attr.state,
 283                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 284                                       ep->hwtid, (int)ep->com.state,
 285                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 286                                       ntohs(m_lsin->sin_port),
 287                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 288                                       ntohs(m_rsin->sin_port));
 289                 } else {
 290                         struct sockaddr_in6 *lsin6;
 291                         struct sockaddr_in6 *rsin6;
 292                         struct sockaddr_in6 *m_lsin6;
 293                         struct sockaddr_in6 *m_rsin6;
 294
 295                         set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
 296                                           &m_rsin6);
 297                         cc = snprintf(qpd->buf + qpd->pos, space,
 298                                       "rc qp sq id %u rq id %u state %u "
 299                                       "onchip %u ep tid %u state %u "
 300                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 301                                       qp->wq.sq.qid, qp->wq.rq.qid,
 302                                       (int)qp->attr.state,
 303                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 304                                       ep->hwtid, (int)ep->com.state,
 305                                       &lsin6->sin6_addr,
 306                                       ntohs(lsin6->sin6_port),
 307                                       ntohs(m_lsin6->sin6_port),
 308                                       &rsin6->sin6_addr,
 309                                       ntohs(rsin6->sin6_port),
 310                                       ntohs(m_rsin6->sin6_port));
 311                 }
 312         } else
 313                 cc = snprintf(qpd->buf + qpd->pos, space,
 314                              "qp sq id %u rq id %u state %u onchip %u\n",
 315                               qp->wq.sq.qid, qp->wq.rq.qid,
 316                               (int)qp->attr.state,
 317                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 318         if (cc < space)
 319                 qpd->pos += cc;
 320         return 0;
 321 }
 322
 323 static int qp_release(struct inode *inode, struct file *file)
 324 {
 325         struct c4iw_debugfs_data *qpd = file->private_data;
 326         if (!qpd) {
 327                 pr_info("%s null qpd?\n", __func__);
 328                 return 0;
 329         }
 330         vfree(qpd->buf);
 331         kfree(qpd);
 332         return 0;
 333 }
 334
 335 static int qp_open(struct inode *inode, struct file *file)
 336 {
 337         struct c4iw_debugfs_data *qpd;
 338         int count = 1;
 339
 340         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 341         if (!qpd)
 342                 return -ENOMEM;
 343
 344         qpd->devp = inode->i_private;
 345         qpd->pos = 0;
 346
 347         spin_lock_irq(&qpd->devp->lock);
 348         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 349         spin_unlock_irq(&qpd->devp->lock);
 350
 351         qpd->bufsize = count * 180;
 352         qpd->buf = vmalloc(qpd->bufsize);
 353         if (!qpd->buf) {
 354                 kfree(qpd);
 355                 return -ENOMEM;
 356         }
 357
 358         spin_lock_irq(&qpd->devp->lock);
 359         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 360         spin_unlock_irq(&qpd->devp->lock);
 361
 362         qpd->buf[qpd->pos++] = 0;
 363         file->private_data = qpd;
 364         return 0;
 365 }
 366
 367 static const struct file_operations qp_debugfs_fops = {
 368         .owner   = THIS_MODULE,
 369         .open    = qp_open,
 370         .release = qp_release,
 371         .read    = debugfs_read,
 372         .llseek  = default_llseek,
 373 };
 374
 375 static int dump_stag(int id, void *p, void *data)
 376 {
 377         struct c4iw_debugfs_data *stagd = data;
 378         int space;
 379         int cc;
 380         struct fw_ri_tpte tpte;
 381         int ret;
 382
 383         space = stagd->bufsize - stagd->pos - 1;
 384         if (space == 0)
 385                 return 1;
 386
 387         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 388                               (__be32 *)&tpte);
 389         if (ret) {
 390                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 391                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 392                 return ret;
 393         }
 394         cc = snprintf(stagd->buf + stagd->pos, space,
 395                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 396                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 397                       (u32)id<<8,
 398                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 399                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 400                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 401                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 402                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 403                       FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 404                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 405                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 406         if (cc < space)
 407                 stagd->pos += cc;
 408         return 0;
 409 }
 410
 411 static int stag_release(struct inode *inode, struct file *file)
 412 {
 413         struct c4iw_debugfs_data *stagd = file->private_data;
 414         if (!stagd) {
 415                 pr_info("%s null stagd?\n", __func__);
 416                 return 0;
 417         }
 418         vfree(stagd->buf);
 419         kfree(stagd);
 420         return 0;
 421 }
 422
 423 static int stag_open(struct inode *inode, struct file *file)
 424 {
 425         struct c4iw_debugfs_data *stagd;
 426         int ret = 0;
 427         int count = 1;
 428
 429         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 430         if (!stagd) {
 431                 ret = -ENOMEM;
 432                 goto out;
 433         }
 434         stagd->devp = inode->i_private;
 435         stagd->pos = 0;
 436
 437         spin_lock_irq(&stagd->devp->lock);
 438         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 439         spin_unlock_irq(&stagd->devp->lock);
 440
 441         stagd->bufsize = count * 256;
 442         stagd->buf = vmalloc(stagd->bufsize);
 443         if (!stagd->buf) {
 444                 ret = -ENOMEM;
 445                 goto err1;
 446         }
 447
 448         spin_lock_irq(&stagd->devp->lock);
 449         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 450         spin_unlock_irq(&stagd->devp->lock);
 451
 452         stagd->buf[stagd->pos++] = 0;
 453         file->private_data = stagd;
 454         goto out;
 455 err1:
 456         kfree(stagd);
 457 out:
 458         return ret;
 459 }
 460
 461 static const struct file_operations stag_debugfs_fops = {
 462         .owner   = THIS_MODULE,
 463         .open    = stag_open,
 464         .release = stag_release,
 465         .read    = debugfs_read,
 466         .llseek  = default_llseek,
 467 };
 468
 469 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 470
 471 static int stats_show(struct seq_file *seq, void *v)
 472 {
 473         struct c4iw_dev *dev = seq->private;
 474
 475         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 476                    "Max", "Fail");
 477         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 478                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 479                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 480         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 481                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 482                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 483         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 484                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 485                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 486         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 487                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 488                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 489         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 490                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 491                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 492         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 493                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 494                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 495         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 496         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 497         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 498         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 499                    db_state_str[dev->db_state],
 500                    dev->rdev.stats.db_state_transitions,
 501                    dev->rdev.stats.db_fc_interruptions);
 502         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 503         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 504                    dev->rdev.stats.act_ofld_conn_fails);
 505         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 506                    dev->rdev.stats.pas_ofld_conn_fails);
 507         seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 508         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 509         return 0;
 510 }
 511
 512 static int stats_open(struct inode *inode, struct file *file)
 513 {
 514         return single_open(file, stats_show, inode->i_private);
 515 }
 516
 517 static ssize_t stats_clear(struct file *file, const char __user *buf,
 518                 size_t count, loff_t *pos)
 519 {
 520         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 521
 522         mutex_lock(&dev->rdev.stats.lock);
 523         dev->rdev.stats.pd.max = 0;
 524         dev->rdev.stats.pd.fail = 0;
 525         dev->rdev.stats.qid.max = 0;
 526         dev->rdev.stats.qid.fail = 0;
 527         dev->rdev.stats.stag.max = 0;
 528         dev->rdev.stats.stag.fail = 0;
 529         dev->rdev.stats.pbl.max = 0;
 530         dev->rdev.stats.pbl.fail = 0;
 531         dev->rdev.stats.rqt.max = 0;
 532         dev->rdev.stats.rqt.fail = 0;
 533         dev->rdev.stats.ocqp.max = 0;
 534         dev->rdev.stats.ocqp.fail = 0;
 535         dev->rdev.stats.db_full = 0;
 536         dev->rdev.stats.db_empty = 0;
 537         dev->rdev.stats.db_drop = 0;
 538         dev->rdev.stats.db_state_transitions = 0;
 539         dev->rdev.stats.tcam_full = 0;
 540         dev->rdev.stats.act_ofld_conn_fails = 0;
 541         dev->rdev.stats.pas_ofld_conn_fails = 0;
 542         mutex_unlock(&dev->rdev.stats.lock);
 543         return count;
 544 }
 545
 546 static const struct file_operations stats_debugfs_fops = {
 547         .owner   = THIS_MODULE,
 548         .open    = stats_open,
 549         .release = single_release,
 550         .read    = seq_read,
 551         .llseek  = seq_lseek,
 552         .write   = stats_clear,
 553 };
 554
 555 static int dump_ep(int id, void *p, void *data)
 556 {
 557         struct c4iw_ep *ep = p;
 558         struct c4iw_debugfs_data *epd = data;
 559         int space;
 560         int cc;
 561
 562         space = epd->bufsize - epd->pos - 1;
 563         if (space == 0)
 564                 return 1;
 565
 566         if (ep->com.local_addr.ss_family == AF_INET) {
 567                 struct sockaddr_in *lsin;
 568                 struct sockaddr_in *rsin;
 569                 struct sockaddr_in *m_lsin;
 570                 struct sockaddr_in *m_rsin;
 571
 572                 set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 573                 cc = snprintf(epd->buf + epd->pos, space,
 574                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 575                               "history 0x%lx hwtid %d atid %d "
 576                               "conn_na %u abort_na %u "
 577                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 578                               ep, ep->com.cm_id, ep->com.qp,
 579                               (int)ep->com.state, ep->com.flags,
 580                               ep->com.history, ep->hwtid, ep->atid,
 581                               ep->stats.connect_neg_adv,
 582                               ep->stats.abort_neg_adv,
 583                               &lsin->sin_addr, ntohs(lsin->sin_port),
 584                               ntohs(m_lsin->sin_port),
 585                               &rsin->sin_addr, ntohs(rsin->sin_port),
 586                               ntohs(m_rsin->sin_port));
 587         } else {
 588                 struct sockaddr_in6 *lsin6;
 589                 struct sockaddr_in6 *rsin6;
 590                 struct sockaddr_in6 *m_lsin6;
 591                 struct sockaddr_in6 *m_rsin6;
 592
 593                 set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
 594                 cc = snprintf(epd->buf + epd->pos, space,
 595                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 596                               "history 0x%lx hwtid %d atid %d "
 597                               "conn_na %u abort_na %u "
 598                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 599                               ep, ep->com.cm_id, ep->com.qp,
 600                               (int)ep->com.state, ep->com.flags,
 601                               ep->com.history, ep->hwtid, ep->atid,
 602                               ep->stats.connect_neg_adv,
 603                               ep->stats.abort_neg_adv,
 604                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 605                               ntohs(m_lsin6->sin6_port),
 606                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 607                               ntohs(m_rsin6->sin6_port));
 608         }
 609         if (cc < space)
 610                 epd->pos += cc;
 611         return 0;
 612 }
 613
 614 static int dump_listen_ep(int id, void *p, void *data)
 615 {
 616         struct c4iw_listen_ep *ep = p;
 617         struct c4iw_debugfs_data *epd = data;
 618         int space;
 619         int cc;
 620
 621         space = epd->bufsize - epd->pos - 1;
 622         if (space == 0)
 623                 return 1;
 624
 625         if (ep->com.local_addr.ss_family == AF_INET) {
 626                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 627                         &ep->com.cm_id->local_addr;
 628                 struct sockaddr_in *m_lsin = (struct sockaddr_in *)
 629                         &ep->com.cm_id->m_local_addr;
 630
 631                 cc = snprintf(epd->buf + epd->pos, space,
 632                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 633                               "backlog %d %pI4:%d/%d\n",
 634                               ep, ep->com.cm_id, (int)ep->com.state,
 635                               ep->com.flags, ep->stid, ep->backlog,
 636                               &lsin->sin_addr, ntohs(lsin->sin_port),
 637                               ntohs(m_lsin->sin_port));
 638         } else {
 639                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 640                         &ep->com.cm_id->local_addr;
 641                 struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
 642                         &ep->com.cm_id->m_local_addr;
 643
 644                 cc = snprintf(epd->buf + epd->pos, space,
 645                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 646                               "backlog %d %pI6:%d/%d\n",
 647                               ep, ep->com.cm_id, (int)ep->com.state,
 648                               ep->com.flags, ep->stid, ep->backlog,
 649                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 650                               ntohs(m_lsin6->sin6_port));
 651         }
 652         if (cc < space)
 653                 epd->pos += cc;
 654         return 0;
 655 }
 656
 657 static int ep_release(struct inode *inode, struct file *file)
 658 {
 659         struct c4iw_debugfs_data *epd = file->private_data;
 660         if (!epd) {
 661                 pr_info("%s null qpd?\n", __func__);
 662                 return 0;
 663         }
 664         vfree(epd->buf);
 665         kfree(epd);
 666         return 0;
 667 }
 668
 669 static int ep_open(struct inode *inode, struct file *file)
 670 {
 671         struct c4iw_debugfs_data *epd;
 672         int ret = 0;
 673         int count = 1;
 674
 675         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 676         if (!epd) {
 677                 ret = -ENOMEM;
 678                 goto out;
 679         }
 680         epd->devp = inode->i_private;
 681         epd->pos = 0;
 682
 683         spin_lock_irq(&epd->devp->lock);
 684         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 685         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 686         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 687         spin_unlock_irq(&epd->devp->lock);
 688
 689         epd->bufsize = count * 240;
 690         epd->buf = vmalloc(epd->bufsize);
 691         if (!epd->buf) {
 692                 ret = -ENOMEM;
 693                 goto err1;
 694         }
 695
 696         spin_lock_irq(&epd->devp->lock);
 697         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 698         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 699         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 700         spin_unlock_irq(&epd->devp->lock);
 701
 702         file->private_data = epd;
 703         goto out;
 704 err1:
 705         kfree(epd);
 706 out:
 707         return ret;
 708 }
 709
 710 static const struct file_operations ep_debugfs_fops = {
 711         .owner   = THIS_MODULE,
 712         .open    = ep_open,
 713         .release = ep_release,
 714         .read    = debugfs_read,
 715 };
 716
 717 static int setup_debugfs(struct c4iw_dev *devp)
 718 {
 719         if (!devp->debugfs_root)
 720                 return -1;
 721
 722         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 723                                  (void *)devp, &qp_debugfs_fops, 4096);
 724
 725         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 726                                  (void *)devp, &stag_debugfs_fops, 4096);
 727
 728         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 729                                  (void *)devp, &stats_debugfs_fops, 4096);
 730
 731         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 732                                  (void *)devp, &ep_debugfs_fops, 4096);
 733
 734         if (c4iw_wr_log)
 735                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 736                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 737         return 0;
 738 }
 739
 740 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 741                                struct c4iw_dev_ucontext *uctx)
 742 {
 743         struct list_head *pos, *nxt;
 744         struct c4iw_qid_list *entry;
 745
 746         mutex_lock(&uctx->lock);
 747         list_for_each_safe(pos, nxt, &uctx->qpids) {
 748                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 749                 list_del_init(&entry->entry);
 750                 if (!(entry->qid & rdev->qpmask)) {
 751                         c4iw_put_resource(&rdev->resource.qid_table,
 752                                           entry->qid);
 753                         mutex_lock(&rdev->stats.lock);
 754                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 755                         mutex_unlock(&rdev->stats.lock);
 756                 }
 757                 kfree(entry);
 758         }
 759
 760         list_for_each_safe(pos, nxt, &uctx->cqids) {
 761                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 762                 list_del_init(&entry->entry);
 763                 kfree(entry);
 764         }
 765         mutex_unlock(&uctx->lock);
 766 }
 767
 768 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 769                             struct c4iw_dev_ucontext *uctx)
 770 {
 771         INIT_LIST_HEAD(&uctx->qpids);
 772         INIT_LIST_HEAD(&uctx->cqids);
 773         mutex_init(&uctx->lock);
 774 }
 775
 776 /* Caller takes care of locking if needed */
 777 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 778 {
 779         int err;
 780
 781         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 782
 783         /*
 784          * This implementation assumes udb_density == ucq_density!  Eventually
 785          * we might need to support this but for now fail the open. Also the
 786          * cqid and qpid range must match for now.
 787          */
 788         if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 789                 pr_err("%s: unsupported udb/ucq densities %u/%u\n",
 790                        pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 791                        rdev->lldi.ucq_density);
 792                 return -EINVAL;
 793         }
 794         if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 795             rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 796                 pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
 797                        pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 798                        rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 799                        rdev->lldi.vr->cq.size);
 800                 return -EINVAL;
 801         }
 802
 803         rdev->qpmask = rdev->lldi.udb_density - 1;
 804         rdev->cqmask = rdev->lldi.ucq_density - 1;
 805         pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u\n",
 806                  pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 807                  rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 808                  rdev->lldi.vr->pbl.start,
 809                  rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 810                  rdev->lldi.vr->rq.size,
 811                  rdev->lldi.vr->qp.start,
 812                  rdev->lldi.vr->qp.size,
 813                  rdev->lldi.vr->cq.start,
 814                  rdev->lldi.vr->cq.size);
 815         pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
 816                  &rdev->lldi.pdev->resource[2],
 817                  rdev->lldi.db_reg, rdev->lldi.gts_reg,
 818                  rdev->qpmask, rdev->cqmask);
 819
 820         if (c4iw_num_stags(rdev) == 0)
 821                 return -EINVAL;
 822
 823         rdev->stats.pd.total = T4_MAX_NUM_PD;
 824         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 825         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 826         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 827         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 828         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 829
 830         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 831         if (err) {
 832                 pr_err("error %d initializing resources\n", err);
 833                 return err;
 834         }
 835         err = c4iw_pblpool_create(rdev);
 836         if (err) {
 837                 pr_err("error %d initializing pbl pool\n", err);
 838                 goto destroy_resource;
 839         }
 840         err = c4iw_rqtpool_create(rdev);
 841         if (err) {
 842                 pr_err("error %d initializing rqt pool\n", err);
 843                 goto destroy_pblpool;
 844         }
 845         err = c4iw_ocqp_pool_create(rdev);
 846         if (err) {
 847                 pr_err("error %d initializing ocqp pool\n", err);
 848                 goto destroy_rqtpool;
 849         }
 850         rdev->status_page = (struct t4_dev_status_page *)
 851                             __get_free_page(GFP_KERNEL);
 852         if (!rdev->status_page) {
 853                 err = -ENOMEM;
 854                 goto destroy_ocqp_pool;
 855         }
 856         rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
 857         rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
 858         rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
 859         rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
 860
 861         if (c4iw_wr_log) {
 862                 rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
 863                                        sizeof(*rdev->wr_log),
 864                                        GFP_KERNEL);
 865                 if (rdev->wr_log) {
 866                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 867                         atomic_set(&rdev->wr_log_idx, 0);
 868                 }
 869         }
 870
 871         rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
 872         if (!rdev->free_workq) {
 873                 err = -ENOMEM;
 874                 goto err_free_status_page_and_wr_log;
 875         }
 876
 877         rdev->status_page->db_off = 0;
 878
 879         init_completion(&rdev->rqt_compl);
 880         init_completion(&rdev->pbl_compl);
 881         kref_init(&rdev->rqt_kref);
 882         kref_init(&rdev->pbl_kref);
 883
 884         return 0;
 885 err_free_status_page_and_wr_log:
 886         if (c4iw_wr_log && rdev->wr_log)
 887                 kfree(rdev->wr_log);
 888         free_page((unsigned long)rdev->status_page);
 889 destroy_ocqp_pool:
 890         c4iw_ocqp_pool_destroy(rdev);
 891 destroy_rqtpool:
 892         c4iw_rqtpool_destroy(rdev);
 893 destroy_pblpool:
 894         c4iw_pblpool_destroy(rdev);
 895 destroy_resource:
 896         c4iw_destroy_resource(&rdev->resource);
 897         return err;
 898 }
 899
 900 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 901 {
 902         kfree(rdev->wr_log);
 903         c4iw_release_dev_ucontext(rdev, &rdev->uctx);
 904         free_page((unsigned long)rdev->status_page);
 905         c4iw_pblpool_destroy(rdev);
 906         c4iw_rqtpool_destroy(rdev);
 907         wait_for_completion(&rdev->pbl_compl);
 908         wait_for_completion(&rdev->rqt_compl);
 909         c4iw_ocqp_pool_destroy(rdev);
 910         destroy_workqueue(rdev->free_workq);
 911         c4iw_destroy_resource(&rdev->resource);
 912 }
 913
 914 void c4iw_dealloc(struct uld_ctx *ctx)
 915 {
 916         c4iw_rdev_close(&ctx->dev->rdev);
 917         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->cqidr));
 918         idr_destroy(&ctx->dev->cqidr);
 919         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->qpidr));
 920         idr_destroy(&ctx->dev->qpidr);
 921         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->mmidr));
 922         idr_destroy(&ctx->dev->mmidr);
 923         wait_event(ctx->dev->wait, idr_is_empty(&ctx->dev->hwtid_idr));
 924         idr_destroy(&ctx->dev->hwtid_idr);
 925         idr_destroy(&ctx->dev->stid_idr);
 926         idr_destroy(&ctx->dev->atid_idr);
 927         if (ctx->dev->rdev.bar2_kva)
 928                 iounmap(ctx->dev->rdev.bar2_kva);
 929         if (ctx->dev->rdev.oc_mw_kva)
 930                 iounmap(ctx->dev->rdev.oc_mw_kva);
 931         ib_dealloc_device(&ctx->dev->ibdev);
 932         ctx->dev = NULL;
 933 }
 934
 935 static void c4iw_remove(struct uld_ctx *ctx)
 936 {
 937         pr_debug("c4iw_dev %p\n", ctx->dev);
 938         c4iw_unregister_device(ctx->dev);
 939         c4iw_dealloc(ctx);
 940 }
 941
 942 static int rdma_supported(const struct cxgb4_lld_info *infop)
 943 {
 944         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 945                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 946                infop->vr->cq.size > 0;
 947 }
 948
 949 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 950 {
 951         struct c4iw_dev *devp;
 952         int ret;
 953
 954         if (!rdma_supported(infop)) {
 955                 pr_info("%s: RDMA not supported on this device\n",
 956                         pci_name(infop->pdev));
 957                 return ERR_PTR(-ENOSYS);
 958         }
 959         if (!ocqp_supported(infop))
 960                 pr_info("%s: On-Chip Queues not supported on this device\n",
 961                         pci_name(infop->pdev));
 962
 963         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 964         if (!devp) {
 965                 pr_err("Cannot allocate ib device\n");
 966                 return ERR_PTR(-ENOMEM);
 967         }
 968         devp->rdev.lldi = *infop;
 969
 970         /* init various hw-queue params based on lld info */
 971         pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 972                  devp->rdev.lldi.sge_ingpadboundary,
 973                  devp->rdev.lldi.sge_egrstatuspagesize);
 974
 975         devp->rdev.hw_queue.t4_eq_status_entries =
 976                 devp->rdev.lldi.sge_egrstatuspagesize / 64;
 977         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 978         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 979         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 980                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 981         devp->rdev.hw_queue.t4_max_sq_size =
 982                 devp->rdev.hw_queue.t4_max_eq_size -
 983                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 984         devp->rdev.hw_queue.t4_max_qp_depth =
 985                 devp->rdev.hw_queue.t4_max_rq_size;
 986         devp->rdev.hw_queue.t4_max_cq_depth =
 987                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 988         devp->rdev.hw_queue.t4_stat_len =
 989                 devp->rdev.lldi.sge_egrstatuspagesize;
 990
 991         /*
 992          * For T5/T6 devices, we map all of BAR2 with WC.
 993          * For T4 devices with onchip qp mem, we map only that part
 994          * of BAR2 with WC.
 995          */
 996         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 997         if (!is_t4(devp->rdev.lldi.adapter_type)) {
 998                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 999                         pci_resource_len(devp->rdev.lldi.pdev, 2));
1000                 if (!devp->rdev.bar2_kva) {
1001                         pr_err("Unable to ioremap BAR2\n");
1002                         ib_dealloc_device(&devp->ibdev);
1003                         return ERR_PTR(-EINVAL);
1004                 }
1005         } else if (ocqp_supported(infop)) {
1006                 devp->rdev.oc_mw_pa =
1007                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
1008                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
1009                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1010                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1011                         devp->rdev.lldi.vr->ocq.size);
1012                 if (!devp->rdev.oc_mw_kva) {
1013                         pr_err("Unable to ioremap onchip mem\n");
1014                         ib_dealloc_device(&devp->ibdev);
1015                         return ERR_PTR(-EINVAL);
1016                 }
1017         }
1018
1019         pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1020                  devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1021                  devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1022
1023         ret = c4iw_rdev_open(&devp->rdev);
1024         if (ret) {
1025                 pr_err("Unable to open CXIO rdev err %d\n", ret);
1026                 ib_dealloc_device(&devp->ibdev);
1027                 return ERR_PTR(ret);
1028         }
1029
1030         idr_init(&devp->cqidr);
1031         idr_init(&devp->qpidr);
1032         idr_init(&devp->mmidr);
1033         idr_init(&devp->hwtid_idr);
1034         idr_init(&devp->stid_idr);
1035         idr_init(&devp->atid_idr);
1036         spin_lock_init(&devp->lock);
1037         mutex_init(&devp->rdev.stats.lock);
1038         mutex_init(&devp->db_mutex);
1039         INIT_LIST_HEAD(&devp->db_fc_list);
1040         init_waitqueue_head(&devp->wait);
1041         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1042
1043         if (c4iw_debugfs_root) {
1044                 devp->debugfs_root = debugfs_create_dir(
1045                                         pci_name(devp->rdev.lldi.pdev),
1046                                         c4iw_debugfs_root);
1047                 setup_debugfs(devp);
1048         }
1049
1050
1051         return devp;
1052 }
1053
1054 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1055 {
1056         struct uld_ctx *ctx;
1057         static int vers_printed;
1058         int i;
1059
1060         if (!vers_printed++)
1061                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1062                         DRV_VERSION);
1063
1064         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1065         if (!ctx) {
1066                 ctx = ERR_PTR(-ENOMEM);
1067                 goto out;
1068         }
1069         ctx->lldi = *infop;
1070
1071         pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1072                  pci_name(ctx->lldi.pdev),
1073                  ctx->lldi.nchan, ctx->lldi.nrxq,
1074                  ctx->lldi.ntxq, ctx->lldi.nports);
1075
1076         mutex_lock(&dev_mutex);
1077         list_add_tail(&ctx->entry, &uld_ctx_list);
1078         mutex_unlock(&dev_mutex);
1079
1080         for (i = 0; i < ctx->lldi.nrxq; i++)
1081                 pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1082 out:
1083         return ctx;
1084 }
1085
1086 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1087                                                  const __be64 *rsp,
1088                                                  u32 pktshift)
1089 {
1090         struct sk_buff *skb;
1091
1092         /*
1093          * Allocate space for cpl_pass_accept_req which will be synthesized by
1094          * driver. Once the driver synthesizes the request the skb will go
1095          * through the regular cpl_pass_accept_req processing.
1096          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1097          * cpl_rx_pkt.
1098          */
1099         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1100                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1101         if (unlikely(!skb))
1102                 return NULL;
1103
1104         __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1105                   sizeof(struct rss_header) - pktshift);
1106
1107         /*
1108          * This skb will contain:
1109          *   rss_header from the rspq descriptor (1 flit)
1110          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1111          *   space for the difference between the size of an
1112          *      rx_pkt and pass_accept_req cpl (1 flit)
1113          *   the packet data from the gl
1114          */
1115         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1116                                 sizeof(struct rss_header));
1117         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1118                                        sizeof(struct cpl_pass_accept_req),
1119                                        gl->va + pktshift,
1120                                        gl->tot_len - pktshift);
1121         return skb;
1122 }
1123
1124 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1125                            const __be64 *rsp)
1126 {
1127         unsigned int opcode = *(u8 *)rsp;
1128         struct sk_buff *skb;
1129
1130         if (opcode != CPL_RX_PKT)
1131                 goto out;
1132
1133         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1134         if (skb == NULL)
1135                 goto out;
1136
1137         if (c4iw_handlers[opcode] == NULL) {
1138                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1139                 kfree_skb(skb);
1140                 goto out;
1141         }
1142         c4iw_handlers[opcode](dev, skb);
1143         return 1;
1144 out:
1145         return 0;
1146 }
1147
1148 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1149                         const struct pkt_gl *gl)
1150 {
1151         struct uld_ctx *ctx = handle;
1152         struct c4iw_dev *dev = ctx->dev;
1153         struct sk_buff *skb;
1154         u8 opcode;
1155
1156         if (gl == NULL) {
1157                 /* omit RSS and rsp_ctrl at end of descriptor */
1158                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1159
1160                 skb = alloc_skb(256, GFP_ATOMIC);
1161                 if (!skb)
1162                         goto nomem;
1163                 __skb_put(skb, len);
1164                 skb_copy_to_linear_data(skb, &rsp[1], len);
1165         } else if (gl == CXGB4_MSG_AN) {
1166                 const struct rsp_ctrl *rc = (void *)rsp;
1167
1168                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1169                 c4iw_ev_handler(dev, qid);
1170                 return 0;
1171         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1172                 if (recv_rx_pkt(dev, gl, rsp))
1173                         return 0;
1174
1175                 pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1176                         pci_name(ctx->lldi.pdev), gl->va,
1177                         be64_to_cpu(*rsp),
1178                         be64_to_cpu(*(__force __be64 *)gl->va),
1179                         gl->tot_len);
1180
1181                 return 0;
1182         } else {
1183                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1184                 if (unlikely(!skb))
1185                         goto nomem;
1186         }
1187
1188         opcode = *(u8 *)rsp;
1189         if (c4iw_handlers[opcode]) {
1190                 c4iw_handlers[opcode](dev, skb);
1191         } else {
1192                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1193                 kfree_skb(skb);
1194         }
1195
1196         return 0;
1197 nomem:
1198         return -1;
1199 }
1200
1201 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1202 {
1203         struct uld_ctx *ctx = handle;
1204
1205         pr_debug("new_state %u\n", new_state);
1206         switch (new_state) {
1207         case CXGB4_STATE_UP:
1208                 pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1209                 if (!ctx->dev) {
1210                         ctx->dev = c4iw_alloc(&ctx->lldi);
1211                         if (IS_ERR(ctx->dev)) {
1212                                 pr_err("%s: initialization failed: %ld\n",
1213                                        pci_name(ctx->lldi.pdev),
1214                                        PTR_ERR(ctx->dev));
1215                                 ctx->dev = NULL;
1216                                 break;
1217                         }
1218
1219                         INIT_WORK(&ctx->reg_work, c4iw_register_device);
1220                         queue_work(reg_workq, &ctx->reg_work);
1221                 }
1222                 break;
1223         case CXGB4_STATE_DOWN:
1224                 pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1225                 if (ctx->dev)
1226                         c4iw_remove(ctx);
1227                 break;
1228         case CXGB4_STATE_FATAL_ERROR:
1229         case CXGB4_STATE_START_RECOVERY:
1230                 pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1231                 if (ctx->dev) {
1232                         struct ib_event event;
1233
1234                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1235                         memset(&event, 0, sizeof event);
1236                         event.event  = IB_EVENT_DEVICE_FATAL;
1237                         event.device = &ctx->dev->ibdev;
1238                         ib_dispatch_event(&event);
1239                         c4iw_remove(ctx);
1240                 }
1241                 break;
1242         case CXGB4_STATE_DETACH:
1243                 pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1244                 if (ctx->dev)
1245                         c4iw_remove(ctx);
1246                 break;
1247         }
1248         return 0;
1249 }
1250
1251 static int disable_qp_db(int id, void *p, void *data)
1252 {
1253         struct c4iw_qp *qp = p;
1254
1255         t4_disable_wq_db(&qp->wq);
1256         return 0;
1257 }
1258
1259 static void stop_queues(struct uld_ctx *ctx)
1260 {
1261         unsigned long flags;
1262
1263         spin_lock_irqsave(&ctx->dev->lock, flags);
1264         ctx->dev->rdev.stats.db_state_transitions++;
1265         ctx->dev->db_state = STOPPED;
1266         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1267                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1268         else
1269                 ctx->dev->rdev.status_page->db_off = 1;
1270         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1271 }
1272
1273 static int enable_qp_db(int id, void *p, void *data)
1274 {
1275         struct c4iw_qp *qp = p;
1276
1277         t4_enable_wq_db(&qp->wq);
1278         return 0;
1279 }
1280
1281 static void resume_rc_qp(struct c4iw_qp *qp)
1282 {
1283         spin_lock(&qp->lock);
1284         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1285         qp->wq.sq.wq_pidx_inc = 0;
1286         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1287         qp->wq.rq.wq_pidx_inc = 0;
1288         spin_unlock(&qp->lock);
1289 }
1290
1291 static void resume_a_chunk(struct uld_ctx *ctx)
1292 {
1293         int i;
1294         struct c4iw_qp *qp;
1295
1296         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1297                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1298                                       db_fc_entry);
1299                 list_del_init(&qp->db_fc_entry);
1300                 resume_rc_qp(qp);
1301                 if (list_empty(&ctx->dev->db_fc_list))
1302                         break;
1303         }
1304 }
1305
1306 static void resume_queues(struct uld_ctx *ctx)
1307 {
1308         spin_lock_irq(&ctx->dev->lock);
1309         if (ctx->dev->db_state != STOPPED)
1310                 goto out;
1311         ctx->dev->db_state = FLOW_CONTROL;
1312         while (1) {
1313                 if (list_empty(&ctx->dev->db_fc_list)) {
1314                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1315                         ctx->dev->db_state = NORMAL;
1316                         ctx->dev->rdev.stats.db_state_transitions++;
1317                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1318                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1319                                              NULL);
1320                         } else {
1321                                 ctx->dev->rdev.status_page->db_off = 0;
1322                         }
1323                         break;
1324                 } else {
1325                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1326                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1327                                DB_FC_DRAIN_THRESH)) {
1328                                 resume_a_chunk(ctx);
1329                         }
1330                         if (!list_empty(&ctx->dev->db_fc_list)) {
1331                                 spin_unlock_irq(&ctx->dev->lock);
1332                                 if (DB_FC_RESUME_DELAY) {
1333                                         set_current_state(TASK_UNINTERRUPTIBLE);
1334                                         schedule_timeout(DB_FC_RESUME_DELAY);
1335                                 }
1336                                 spin_lock_irq(&ctx->dev->lock);
1337                                 if (ctx->dev->db_state != FLOW_CONTROL)
1338                                         break;
1339                         }
1340                 }
1341         }
1342 out:
1343         if (ctx->dev->db_state != NORMAL)
1344                 ctx->dev->rdev.stats.db_fc_interruptions++;
1345         spin_unlock_irq(&ctx->dev->lock);
1346 }
1347
1348 struct qp_list {
1349         unsigned idx;
1350         struct c4iw_qp **qps;
1351 };
1352
1353 static int add_and_ref_qp(int id, void *p, void *data)
1354 {
1355         struct qp_list *qp_listp = data;
1356         struct c4iw_qp *qp = p;
1357
1358         c4iw_qp_add_ref(&qp->ibqp);
1359         qp_listp->qps[qp_listp->idx++] = qp;
1360         return 0;
1361 }
1362
1363 static int count_qps(int id, void *p, void *data)
1364 {
1365         unsigned *countp = data;
1366         (*countp)++;
1367         return 0;
1368 }
1369
1370 static void deref_qps(struct qp_list *qp_list)
1371 {
1372         int idx;
1373
1374         for (idx = 0; idx < qp_list->idx; idx++)
1375                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1376 }
1377
1378 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1379 {
1380         int idx;
1381         int ret;
1382
1383         for (idx = 0; idx < qp_list->idx; idx++) {
1384                 struct c4iw_qp *qp = qp_list->qps[idx];
1385
1386                 spin_lock_irq(&qp->rhp->lock);
1387                 spin_lock(&qp->lock);
1388                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1389                                           qp->wq.sq.qid,
1390                                           t4_sq_host_wq_pidx(&qp->wq),
1391                                           t4_sq_wq_size(&qp->wq));
1392                 if (ret) {
1393                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1394                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1395                         spin_unlock(&qp->lock);
1396                         spin_unlock_irq(&qp->rhp->lock);
1397                         return;
1398                 }
1399                 qp->wq.sq.wq_pidx_inc = 0;
1400
1401                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1402                                           qp->wq.rq.qid,
1403                                           t4_rq_host_wq_pidx(&qp->wq),
1404                                           t4_rq_wq_size(&qp->wq));
1405
1406                 if (ret) {
1407                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1408                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1409                         spin_unlock(&qp->lock);
1410                         spin_unlock_irq(&qp->rhp->lock);
1411                         return;
1412                 }
1413                 qp->wq.rq.wq_pidx_inc = 0;
1414                 spin_unlock(&qp->lock);
1415                 spin_unlock_irq(&qp->rhp->lock);
1416
1417                 /* Wait for the dbfifo to drain */
1418                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1419                         set_current_state(TASK_UNINTERRUPTIBLE);
1420                         schedule_timeout(usecs_to_jiffies(10));
1421                 }
1422         }
1423 }
1424
1425 static void recover_queues(struct uld_ctx *ctx)
1426 {
1427         int count = 0;
1428         struct qp_list qp_list;
1429         int ret;
1430
1431         /* slow everybody down */
1432         set_current_state(TASK_UNINTERRUPTIBLE);
1433         schedule_timeout(usecs_to_jiffies(1000));
1434
1435         /* flush the SGE contexts */
1436         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1437         if (ret) {
1438                 pr_err("%s: Fatal error - DB overflow recovery failed\n",
1439                        pci_name(ctx->lldi.pdev));
1440                 return;
1441         }
1442
1443         /* Count active queues so we can build a list of queues to recover */
1444         spin_lock_irq(&ctx->dev->lock);
1445         WARN_ON(ctx->dev->db_state != STOPPED);
1446         ctx->dev->db_state = RECOVERY;
1447         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1448
1449         qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
1450         if (!qp_list.qps) {
1451                 spin_unlock_irq(&ctx->dev->lock);
1452                 return;
1453         }
1454         qp_list.idx = 0;
1455
1456         /* add and ref each qp so it doesn't get freed */
1457         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1458
1459         spin_unlock_irq(&ctx->dev->lock);
1460
1461         /* now traverse the list in a safe context to recover the db state*/
1462         recover_lost_dbs(ctx, &qp_list);
1463
1464         /* we're almost done!  deref the qps and clean up */
1465         deref_qps(&qp_list);
1466         kfree(qp_list.qps);
1467
1468         spin_lock_irq(&ctx->dev->lock);
1469         WARN_ON(ctx->dev->db_state != RECOVERY);
1470         ctx->dev->db_state = STOPPED;
1471         spin_unlock_irq(&ctx->dev->lock);
1472 }
1473
1474 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1475 {
1476         struct uld_ctx *ctx = handle;
1477
1478         switch (control) {
1479         case CXGB4_CONTROL_DB_FULL:
1480                 stop_queues(ctx);
1481                 ctx->dev->rdev.stats.db_full++;
1482                 break;
1483         case CXGB4_CONTROL_DB_EMPTY:
1484                 resume_queues(ctx);
1485                 mutex_lock(&ctx->dev->rdev.stats.lock);
1486                 ctx->dev->rdev.stats.db_empty++;
1487                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1488                 break;
1489         case CXGB4_CONTROL_DB_DROP:
1490                 recover_queues(ctx);
1491                 mutex_lock(&ctx->dev->rdev.stats.lock);
1492                 ctx->dev->rdev.stats.db_drop++;
1493                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1494                 break;
1495         default:
1496                 pr_warn("%s: unknown control cmd %u\n",
1497                         pci_name(ctx->lldi.pdev), control);
1498                 break;
1499         }
1500         return 0;
1501 }
1502
1503 static struct cxgb4_uld_info c4iw_uld_info = {
1504         .name = DRV_NAME,
1505         .nrxq = MAX_ULD_QSETS,
1506         .ntxq = MAX_ULD_QSETS,
1507         .rxq_size = 511,
1508         .ciq = true,
1509         .lro = false,
1510         .add = c4iw_uld_add,
1511         .rx_handler = c4iw_uld_rx_handler,
1512         .state_change = c4iw_uld_state_change,
1513         .control = c4iw_uld_control,
1514 };
1515
1516 void _c4iw_free_wr_wait(struct kref *kref)
1517 {
1518         struct c4iw_wr_wait *wr_waitp;
1519
1520         wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1521         pr_debug("Free wr_wait %p\n", wr_waitp);
1522         kfree(wr_waitp);
1523 }
1524
1525 struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1526 {
1527         struct c4iw_wr_wait *wr_waitp;
1528
1529         wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1530         if (wr_waitp) {
1531                 kref_init(&wr_waitp->kref);
1532                 pr_debug("wr_wait %p\n", wr_waitp);
1533         }
1534         return wr_waitp;
1535 }
1536
1537 static int __init c4iw_init_module(void)
1538 {
1539         int err;
1540
1541         err = c4iw_cm_init();
1542         if (err)
1543                 return err;
1544
1545         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1546         if (!c4iw_debugfs_root)
1547                 pr_warn("could not create debugfs entry, continuing\n");
1548
1549         reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1550         if (!reg_workq) {
1551                 pr_err("Failed creating workqueue to register iwarp device\n");
1552                 return -ENOMEM;
1553         }
1554
1555         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1556
1557         return 0;
1558 }
1559
1560 static void __exit c4iw_exit_module(void)
1561 {
1562         struct uld_ctx *ctx, *tmp;
1563
1564         mutex_lock(&dev_mutex);
1565         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1566                 if (ctx->dev)
1567                         c4iw_remove(ctx);
1568                 kfree(ctx);
1569         }
1570         mutex_unlock(&dev_mutex);
1571         flush_workqueue(reg_workq);
1572         destroy_workqueue(reg_workq);
1573         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1574         c4iw_cm_term();
1575         debugfs_remove_recursive(c4iw_debugfs_root);
1576 }
1577
1578 module_init(c4iw_init_module);
1579 module_exit(c4iw_exit_module);