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 = kzalloc((1 << c4iw_wr_log_size_order) *
 863                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 864                 if (rdev->wr_log) {
 865                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 866                         atomic_set(&rdev->wr_log_idx, 0);
 867                 }
 868         }
 869
 870         rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
 871         if (!rdev->free_workq) {
 872                 err = -ENOMEM;
 873                 goto err_free_status_page_and_wr_log;
 874         }
 875
 876         rdev->status_page->db_off = 0;
 877
 878         return 0;
 879 err_free_status_page_and_wr_log:
 880         if (c4iw_wr_log && rdev->wr_log)
 881                 kfree(rdev->wr_log);
 882         free_page((unsigned long)rdev->status_page);
 883 destroy_ocqp_pool:
 884         c4iw_ocqp_pool_destroy(rdev);
 885 destroy_rqtpool:
 886         c4iw_rqtpool_destroy(rdev);
 887 destroy_pblpool:
 888         c4iw_pblpool_destroy(rdev);
 889 destroy_resource:
 890         c4iw_destroy_resource(&rdev->resource);
 891         return err;
 892 }
 893
 894 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 895 {
 896         destroy_workqueue(rdev->free_workq);
 897         kfree(rdev->wr_log);
 898         c4iw_release_dev_ucontext(rdev, &rdev->uctx);
 899         free_page((unsigned long)rdev->status_page);
 900         c4iw_pblpool_destroy(rdev);
 901         c4iw_rqtpool_destroy(rdev);
 902         c4iw_ocqp_pool_destroy(rdev);
 903         c4iw_destroy_resource(&rdev->resource);
 904 }
 905
 906 void c4iw_dealloc(struct uld_ctx *ctx)
 907 {
 908         c4iw_rdev_close(&ctx->dev->rdev);
 909         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->cqidr));
 910         idr_destroy(&ctx->dev->cqidr);
 911         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->qpidr));
 912         idr_destroy(&ctx->dev->qpidr);
 913         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->mmidr));
 914         idr_destroy(&ctx->dev->mmidr);
 915         wait_event(ctx->dev->wait, idr_is_empty(&ctx->dev->hwtid_idr));
 916         idr_destroy(&ctx->dev->hwtid_idr);
 917         idr_destroy(&ctx->dev->stid_idr);
 918         idr_destroy(&ctx->dev->atid_idr);
 919         if (ctx->dev->rdev.bar2_kva)
 920                 iounmap(ctx->dev->rdev.bar2_kva);
 921         if (ctx->dev->rdev.oc_mw_kva)
 922                 iounmap(ctx->dev->rdev.oc_mw_kva);
 923         ib_dealloc_device(&ctx->dev->ibdev);
 924         ctx->dev = NULL;
 925 }
 926
 927 static void c4iw_remove(struct uld_ctx *ctx)
 928 {
 929         pr_debug("c4iw_dev %p\n", ctx->dev);
 930         c4iw_unregister_device(ctx->dev);
 931         c4iw_dealloc(ctx);
 932 }
 933
 934 static int rdma_supported(const struct cxgb4_lld_info *infop)
 935 {
 936         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 937                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 938                infop->vr->cq.size > 0;
 939 }
 940
 941 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 942 {
 943         struct c4iw_dev *devp;
 944         int ret;
 945
 946         if (!rdma_supported(infop)) {
 947                 pr_info("%s: RDMA not supported on this device\n",
 948                         pci_name(infop->pdev));
 949                 return ERR_PTR(-ENOSYS);
 950         }
 951         if (!ocqp_supported(infop))
 952                 pr_info("%s: On-Chip Queues not supported on this device\n",
 953                         pci_name(infop->pdev));
 954
 955         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 956         if (!devp) {
 957                 pr_err("Cannot allocate ib device\n");
 958                 return ERR_PTR(-ENOMEM);
 959         }
 960         devp->rdev.lldi = *infop;
 961
 962         /* init various hw-queue params based on lld info */
 963         pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 964                  devp->rdev.lldi.sge_ingpadboundary,
 965                  devp->rdev.lldi.sge_egrstatuspagesize);
 966
 967         devp->rdev.hw_queue.t4_eq_status_entries =
 968                 devp->rdev.lldi.sge_egrstatuspagesize / 64;
 969         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 970         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 971         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 972                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 973         devp->rdev.hw_queue.t4_max_sq_size =
 974                 devp->rdev.hw_queue.t4_max_eq_size -
 975                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 976         devp->rdev.hw_queue.t4_max_qp_depth =
 977                 devp->rdev.hw_queue.t4_max_rq_size;
 978         devp->rdev.hw_queue.t4_max_cq_depth =
 979                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 980         devp->rdev.hw_queue.t4_stat_len =
 981                 devp->rdev.lldi.sge_egrstatuspagesize;
 982
 983         /*
 984          * For T5/T6 devices, we map all of BAR2 with WC.
 985          * For T4 devices with onchip qp mem, we map only that part
 986          * of BAR2 with WC.
 987          */
 988         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 989         if (!is_t4(devp->rdev.lldi.adapter_type)) {
 990                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 991                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 992                 if (!devp->rdev.bar2_kva) {
 993                         pr_err("Unable to ioremap BAR2\n");
 994                         ib_dealloc_device(&devp->ibdev);
 995                         return ERR_PTR(-EINVAL);
 996                 }
 997         } else if (ocqp_supported(infop)) {
 998                 devp->rdev.oc_mw_pa =
 999                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
1000                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
1001                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1002                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1003                         devp->rdev.lldi.vr->ocq.size);
1004                 if (!devp->rdev.oc_mw_kva) {
1005                         pr_err("Unable to ioremap onchip mem\n");
1006                         ib_dealloc_device(&devp->ibdev);
1007                         return ERR_PTR(-EINVAL);
1008                 }
1009         }
1010
1011         pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1012                  devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1013                  devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1014
1015         ret = c4iw_rdev_open(&devp->rdev);
1016         if (ret) {
1017                 pr_err("Unable to open CXIO rdev err %d\n", ret);
1018                 ib_dealloc_device(&devp->ibdev);
1019                 return ERR_PTR(ret);
1020         }
1021
1022         idr_init(&devp->cqidr);
1023         idr_init(&devp->qpidr);
1024         idr_init(&devp->mmidr);
1025         idr_init(&devp->hwtid_idr);
1026         idr_init(&devp->stid_idr);
1027         idr_init(&devp->atid_idr);
1028         spin_lock_init(&devp->lock);
1029         mutex_init(&devp->rdev.stats.lock);
1030         mutex_init(&devp->db_mutex);
1031         INIT_LIST_HEAD(&devp->db_fc_list);
1032         init_waitqueue_head(&devp->wait);
1033         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1034
1035         if (c4iw_debugfs_root) {
1036                 devp->debugfs_root = debugfs_create_dir(
1037                                         pci_name(devp->rdev.lldi.pdev),
1038                                         c4iw_debugfs_root);
1039                 setup_debugfs(devp);
1040         }
1041
1042
1043         return devp;
1044 }
1045
1046 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1047 {
1048         struct uld_ctx *ctx;
1049         static int vers_printed;
1050         int i;
1051
1052         if (!vers_printed++)
1053                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1054                         DRV_VERSION);
1055
1056         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1057         if (!ctx) {
1058                 ctx = ERR_PTR(-ENOMEM);
1059                 goto out;
1060         }
1061         ctx->lldi = *infop;
1062
1063         pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1064                  pci_name(ctx->lldi.pdev),
1065                  ctx->lldi.nchan, ctx->lldi.nrxq,
1066                  ctx->lldi.ntxq, ctx->lldi.nports);
1067
1068         mutex_lock(&dev_mutex);
1069         list_add_tail(&ctx->entry, &uld_ctx_list);
1070         mutex_unlock(&dev_mutex);
1071
1072         for (i = 0; i < ctx->lldi.nrxq; i++)
1073                 pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1074 out:
1075         return ctx;
1076 }
1077
1078 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1079                                                  const __be64 *rsp,
1080                                                  u32 pktshift)
1081 {
1082         struct sk_buff *skb;
1083
1084         /*
1085          * Allocate space for cpl_pass_accept_req which will be synthesized by
1086          * driver. Once the driver synthesizes the request the skb will go
1087          * through the regular cpl_pass_accept_req processing.
1088          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1089          * cpl_rx_pkt.
1090          */
1091         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1092                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1093         if (unlikely(!skb))
1094                 return NULL;
1095
1096         __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1097                   sizeof(struct rss_header) - pktshift);
1098
1099         /*
1100          * This skb will contain:
1101          *   rss_header from the rspq descriptor (1 flit)
1102          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1103          *   space for the difference between the size of an
1104          *      rx_pkt and pass_accept_req cpl (1 flit)
1105          *   the packet data from the gl
1106          */
1107         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1108                                 sizeof(struct rss_header));
1109         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1110                                        sizeof(struct cpl_pass_accept_req),
1111                                        gl->va + pktshift,
1112                                        gl->tot_len - pktshift);
1113         return skb;
1114 }
1115
1116 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1117                            const __be64 *rsp)
1118 {
1119         unsigned int opcode = *(u8 *)rsp;
1120         struct sk_buff *skb;
1121
1122         if (opcode != CPL_RX_PKT)
1123                 goto out;
1124
1125         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1126         if (skb == NULL)
1127                 goto out;
1128
1129         if (c4iw_handlers[opcode] == NULL) {
1130                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1131                 kfree_skb(skb);
1132                 goto out;
1133         }
1134         c4iw_handlers[opcode](dev, skb);
1135         return 1;
1136 out:
1137         return 0;
1138 }
1139
1140 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1141                         const struct pkt_gl *gl)
1142 {
1143         struct uld_ctx *ctx = handle;
1144         struct c4iw_dev *dev = ctx->dev;
1145         struct sk_buff *skb;
1146         u8 opcode;
1147
1148         if (gl == NULL) {
1149                 /* omit RSS and rsp_ctrl at end of descriptor */
1150                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1151
1152                 skb = alloc_skb(256, GFP_ATOMIC);
1153                 if (!skb)
1154                         goto nomem;
1155                 __skb_put(skb, len);
1156                 skb_copy_to_linear_data(skb, &rsp[1], len);
1157         } else if (gl == CXGB4_MSG_AN) {
1158                 const struct rsp_ctrl *rc = (void *)rsp;
1159
1160                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1161                 c4iw_ev_handler(dev, qid);
1162                 return 0;
1163         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1164                 if (recv_rx_pkt(dev, gl, rsp))
1165                         return 0;
1166
1167                 pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1168                         pci_name(ctx->lldi.pdev), gl->va,
1169                         be64_to_cpu(*rsp),
1170                         be64_to_cpu(*(__force __be64 *)gl->va),
1171                         gl->tot_len);
1172
1173                 return 0;
1174         } else {
1175                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1176                 if (unlikely(!skb))
1177                         goto nomem;
1178         }
1179
1180         opcode = *(u8 *)rsp;
1181         if (c4iw_handlers[opcode]) {
1182                 c4iw_handlers[opcode](dev, skb);
1183         } else {
1184                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1185                 kfree_skb(skb);
1186         }
1187
1188         return 0;
1189 nomem:
1190         return -1;
1191 }
1192
1193 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1194 {
1195         struct uld_ctx *ctx = handle;
1196
1197         pr_debug("new_state %u\n", new_state);
1198         switch (new_state) {
1199         case CXGB4_STATE_UP:
1200                 pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1201                 if (!ctx->dev) {
1202                         ctx->dev = c4iw_alloc(&ctx->lldi);
1203                         if (IS_ERR(ctx->dev)) {
1204                                 pr_err("%s: initialization failed: %ld\n",
1205                                        pci_name(ctx->lldi.pdev),
1206                                        PTR_ERR(ctx->dev));
1207                                 ctx->dev = NULL;
1208                                 break;
1209                         }
1210
1211                         INIT_WORK(&ctx->reg_work, c4iw_register_device);
1212                         queue_work(reg_workq, &ctx->reg_work);
1213                 }
1214                 break;
1215         case CXGB4_STATE_DOWN:
1216                 pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1217                 if (ctx->dev)
1218                         c4iw_remove(ctx);
1219                 break;
1220         case CXGB4_STATE_FATAL_ERROR:
1221         case CXGB4_STATE_START_RECOVERY:
1222                 pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1223                 if (ctx->dev) {
1224                         struct ib_event event;
1225
1226                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1227                         memset(&event, 0, sizeof event);
1228                         event.event  = IB_EVENT_DEVICE_FATAL;
1229                         event.device = &ctx->dev->ibdev;
1230                         ib_dispatch_event(&event);
1231                         c4iw_remove(ctx);
1232                 }
1233                 break;
1234         case CXGB4_STATE_DETACH:
1235                 pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1236                 if (ctx->dev)
1237                         c4iw_remove(ctx);
1238                 break;
1239         }
1240         return 0;
1241 }
1242
1243 static int disable_qp_db(int id, void *p, void *data)
1244 {
1245         struct c4iw_qp *qp = p;
1246
1247         t4_disable_wq_db(&qp->wq);
1248         return 0;
1249 }
1250
1251 static void stop_queues(struct uld_ctx *ctx)
1252 {
1253         unsigned long flags;
1254
1255         spin_lock_irqsave(&ctx->dev->lock, flags);
1256         ctx->dev->rdev.stats.db_state_transitions++;
1257         ctx->dev->db_state = STOPPED;
1258         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1259                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1260         else
1261                 ctx->dev->rdev.status_page->db_off = 1;
1262         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1263 }
1264
1265 static int enable_qp_db(int id, void *p, void *data)
1266 {
1267         struct c4iw_qp *qp = p;
1268
1269         t4_enable_wq_db(&qp->wq);
1270         return 0;
1271 }
1272
1273 static void resume_rc_qp(struct c4iw_qp *qp)
1274 {
1275         spin_lock(&qp->lock);
1276         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1277         qp->wq.sq.wq_pidx_inc = 0;
1278         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1279         qp->wq.rq.wq_pidx_inc = 0;
1280         spin_unlock(&qp->lock);
1281 }
1282
1283 static void resume_a_chunk(struct uld_ctx *ctx)
1284 {
1285         int i;
1286         struct c4iw_qp *qp;
1287
1288         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1289                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1290                                       db_fc_entry);
1291                 list_del_init(&qp->db_fc_entry);
1292                 resume_rc_qp(qp);
1293                 if (list_empty(&ctx->dev->db_fc_list))
1294                         break;
1295         }
1296 }
1297
1298 static void resume_queues(struct uld_ctx *ctx)
1299 {
1300         spin_lock_irq(&ctx->dev->lock);
1301         if (ctx->dev->db_state != STOPPED)
1302                 goto out;
1303         ctx->dev->db_state = FLOW_CONTROL;
1304         while (1) {
1305                 if (list_empty(&ctx->dev->db_fc_list)) {
1306                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1307                         ctx->dev->db_state = NORMAL;
1308                         ctx->dev->rdev.stats.db_state_transitions++;
1309                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1310                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1311                                              NULL);
1312                         } else {
1313                                 ctx->dev->rdev.status_page->db_off = 0;
1314                         }
1315                         break;
1316                 } else {
1317                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1318                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1319                                DB_FC_DRAIN_THRESH)) {
1320                                 resume_a_chunk(ctx);
1321                         }
1322                         if (!list_empty(&ctx->dev->db_fc_list)) {
1323                                 spin_unlock_irq(&ctx->dev->lock);
1324                                 if (DB_FC_RESUME_DELAY) {
1325                                         set_current_state(TASK_UNINTERRUPTIBLE);
1326                                         schedule_timeout(DB_FC_RESUME_DELAY);
1327                                 }
1328                                 spin_lock_irq(&ctx->dev->lock);
1329                                 if (ctx->dev->db_state != FLOW_CONTROL)
1330                                         break;
1331                         }
1332                 }
1333         }
1334 out:
1335         if (ctx->dev->db_state != NORMAL)
1336                 ctx->dev->rdev.stats.db_fc_interruptions++;
1337         spin_unlock_irq(&ctx->dev->lock);
1338 }
1339
1340 struct qp_list {
1341         unsigned idx;
1342         struct c4iw_qp **qps;
1343 };
1344
1345 static int add_and_ref_qp(int id, void *p, void *data)
1346 {
1347         struct qp_list *qp_listp = data;
1348         struct c4iw_qp *qp = p;
1349
1350         c4iw_qp_add_ref(&qp->ibqp);
1351         qp_listp->qps[qp_listp->idx++] = qp;
1352         return 0;
1353 }
1354
1355 static int count_qps(int id, void *p, void *data)
1356 {
1357         unsigned *countp = data;
1358         (*countp)++;
1359         return 0;
1360 }
1361
1362 static void deref_qps(struct qp_list *qp_list)
1363 {
1364         int idx;
1365
1366         for (idx = 0; idx < qp_list->idx; idx++)
1367                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1368 }
1369
1370 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1371 {
1372         int idx;
1373         int ret;
1374
1375         for (idx = 0; idx < qp_list->idx; idx++) {
1376                 struct c4iw_qp *qp = qp_list->qps[idx];
1377
1378                 spin_lock_irq(&qp->rhp->lock);
1379                 spin_lock(&qp->lock);
1380                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1381                                           qp->wq.sq.qid,
1382                                           t4_sq_host_wq_pidx(&qp->wq),
1383                                           t4_sq_wq_size(&qp->wq));
1384                 if (ret) {
1385                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1386                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1387                         spin_unlock(&qp->lock);
1388                         spin_unlock_irq(&qp->rhp->lock);
1389                         return;
1390                 }
1391                 qp->wq.sq.wq_pidx_inc = 0;
1392
1393                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1394                                           qp->wq.rq.qid,
1395                                           t4_rq_host_wq_pidx(&qp->wq),
1396                                           t4_rq_wq_size(&qp->wq));
1397
1398                 if (ret) {
1399                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1400                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1401                         spin_unlock(&qp->lock);
1402                         spin_unlock_irq(&qp->rhp->lock);
1403                         return;
1404                 }
1405                 qp->wq.rq.wq_pidx_inc = 0;
1406                 spin_unlock(&qp->lock);
1407                 spin_unlock_irq(&qp->rhp->lock);
1408
1409                 /* Wait for the dbfifo to drain */
1410                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1411                         set_current_state(TASK_UNINTERRUPTIBLE);
1412                         schedule_timeout(usecs_to_jiffies(10));
1413                 }
1414         }
1415 }
1416
1417 static void recover_queues(struct uld_ctx *ctx)
1418 {
1419         int count = 0;
1420         struct qp_list qp_list;
1421         int ret;
1422
1423         /* slow everybody down */
1424         set_current_state(TASK_UNINTERRUPTIBLE);
1425         schedule_timeout(usecs_to_jiffies(1000));
1426
1427         /* flush the SGE contexts */
1428         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1429         if (ret) {
1430                 pr_err("%s: Fatal error - DB overflow recovery failed\n",
1431                        pci_name(ctx->lldi.pdev));
1432                 return;
1433         }
1434
1435         /* Count active queues so we can build a list of queues to recover */
1436         spin_lock_irq(&ctx->dev->lock);
1437         WARN_ON(ctx->dev->db_state != STOPPED);
1438         ctx->dev->db_state = RECOVERY;
1439         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1440
1441         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1442         if (!qp_list.qps) {
1443                 spin_unlock_irq(&ctx->dev->lock);
1444                 return;
1445         }
1446         qp_list.idx = 0;
1447
1448         /* add and ref each qp so it doesn't get freed */
1449         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1450
1451         spin_unlock_irq(&ctx->dev->lock);
1452
1453         /* now traverse the list in a safe context to recover the db state*/
1454         recover_lost_dbs(ctx, &qp_list);
1455
1456         /* we're almost done!  deref the qps and clean up */
1457         deref_qps(&qp_list);
1458         kfree(qp_list.qps);
1459
1460         spin_lock_irq(&ctx->dev->lock);
1461         WARN_ON(ctx->dev->db_state != RECOVERY);
1462         ctx->dev->db_state = STOPPED;
1463         spin_unlock_irq(&ctx->dev->lock);
1464 }
1465
1466 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1467 {
1468         struct uld_ctx *ctx = handle;
1469
1470         switch (control) {
1471         case CXGB4_CONTROL_DB_FULL:
1472                 stop_queues(ctx);
1473                 ctx->dev->rdev.stats.db_full++;
1474                 break;
1475         case CXGB4_CONTROL_DB_EMPTY:
1476                 resume_queues(ctx);
1477                 mutex_lock(&ctx->dev->rdev.stats.lock);
1478                 ctx->dev->rdev.stats.db_empty++;
1479                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1480                 break;
1481         case CXGB4_CONTROL_DB_DROP:
1482                 recover_queues(ctx);
1483                 mutex_lock(&ctx->dev->rdev.stats.lock);
1484                 ctx->dev->rdev.stats.db_drop++;
1485                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1486                 break;
1487         default:
1488                 pr_warn("%s: unknown control cmd %u\n",
1489                         pci_name(ctx->lldi.pdev), control);
1490                 break;
1491         }
1492         return 0;
1493 }
1494
1495 static struct cxgb4_uld_info c4iw_uld_info = {
1496         .name = DRV_NAME,
1497         .nrxq = MAX_ULD_QSETS,
1498         .ntxq = MAX_ULD_QSETS,
1499         .rxq_size = 511,
1500         .ciq = true,
1501         .lro = false,
1502         .add = c4iw_uld_add,
1503         .rx_handler = c4iw_uld_rx_handler,
1504         .state_change = c4iw_uld_state_change,
1505         .control = c4iw_uld_control,
1506 };
1507
1508 void _c4iw_free_wr_wait(struct kref *kref)
1509 {
1510         struct c4iw_wr_wait *wr_waitp;
1511
1512         wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1513         pr_debug("Free wr_wait %p\n", wr_waitp);
1514         kfree(wr_waitp);
1515 }
1516
1517 struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1518 {
1519         struct c4iw_wr_wait *wr_waitp;
1520
1521         wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1522         if (wr_waitp) {
1523                 kref_init(&wr_waitp->kref);
1524                 pr_debug("wr_wait %p\n", wr_waitp);
1525         }
1526         return wr_waitp;
1527 }
1528
1529 static int __init c4iw_init_module(void)
1530 {
1531         int err;
1532
1533         err = c4iw_cm_init();
1534         if (err)
1535                 return err;
1536
1537         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1538         if (!c4iw_debugfs_root)
1539                 pr_warn("could not create debugfs entry, continuing\n");
1540
1541         reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1542         if (!reg_workq) {
1543                 pr_err("Failed creating workqueue to register iwarp device\n");
1544                 return -ENOMEM;
1545         }
1546
1547         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1548
1549         return 0;
1550 }
1551
1552 static void __exit c4iw_exit_module(void)
1553 {
1554         struct uld_ctx *ctx, *tmp;
1555
1556         mutex_lock(&dev_mutex);
1557         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1558                 if (ctx->dev)
1559                         c4iw_remove(ctx);
1560                 kfree(ctx);
1561         }
1562         mutex_unlock(&dev_mutex);
1563         flush_workqueue(reg_workq);
1564         destroy_workqueue(reg_workq);
1565         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1566         c4iw_cm_term();
1567         debugfs_remove_recursive(c4iw_debugfs_root);
1568 }
1569
1570 module_init(c4iw_init_module);
1571 module_exit(c4iw_exit_module);