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 MODULE_VERSION(DRV_VERSION);
  48
  49 static int allow_db_fc_on_t5;
  50 module_param(allow_db_fc_on_t5, int, 0644);
  51 MODULE_PARM_DESC(allow_db_fc_on_t5,
  52                  "Allow DB Flow Control on T5 (default = 0)");
  53
  54 static int allow_db_coalescing_on_t5;
  55 module_param(allow_db_coalescing_on_t5, int, 0644);
  56 MODULE_PARM_DESC(allow_db_coalescing_on_t5,
  57                  "Allow DB Coalescing on T5 (default = 0)");
  58
  59 int c4iw_wr_log = 0;
  60 module_param(c4iw_wr_log, int, 0444);
  61 MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
  62
  63 static int c4iw_wr_log_size_order = 12;
  64 module_param(c4iw_wr_log_size_order, int, 0444);
  65 MODULE_PARM_DESC(c4iw_wr_log_size_order,
  66                  "Number of entries (log2) in the work request timing log.");
  67
  68 struct uld_ctx {
  69         struct list_head entry;
  70         struct cxgb4_lld_info lldi;
  71         struct c4iw_dev *dev;
  72 };
  73
  74 static LIST_HEAD(uld_ctx_list);
  75 static DEFINE_MUTEX(dev_mutex);
  76
  77 #define DB_FC_RESUME_SIZE 64
  78 #define DB_FC_RESUME_DELAY 1
  79 #define DB_FC_DRAIN_THRESH 0
  80
  81 static struct dentry *c4iw_debugfs_root;
  82
  83 struct c4iw_debugfs_data {
  84         struct c4iw_dev *devp;
  85         char *buf;
  86         int bufsize;
  87         int pos;
  88 };
  89
  90 static int count_idrs(int id, void *p, void *data)
  91 {
  92         int *countp = data;
  93
  94         *countp = *countp + 1;
  95         return 0;
  96 }
  97
  98 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  99                             loff_t *ppos)
 100 {
 101         struct c4iw_debugfs_data *d = file->private_data;
 102
 103         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
 104 }
 105
 106 void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
 107 {
 108         struct wr_log_entry le;
 109         int idx;
 110
 111         if (!wq->rdev->wr_log)
 112                 return;
 113
 114         idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
 115                 (wq->rdev->wr_log_size - 1);
 116         le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
 117         getnstimeofday(&le.poll_host_ts);
 118         le.valid = 1;
 119         le.cqe_sge_ts = CQE_TS(cqe);
 120         if (SQ_TYPE(cqe)) {
 121                 le.qid = wq->sq.qid;
 122                 le.opcode = CQE_OPCODE(cqe);
 123                 le.post_host_ts = wq->sq.sw_sq[wq->sq.cidx].host_ts;
 124                 le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
 125                 le.wr_id = CQE_WRID_SQ_IDX(cqe);
 126         } else {
 127                 le.qid = wq->rq.qid;
 128                 le.opcode = FW_RI_RECEIVE;
 129                 le.post_host_ts = wq->rq.sw_rq[wq->rq.cidx].host_ts;
 130                 le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
 131                 le.wr_id = CQE_WRID_MSN(cqe);
 132         }
 133         wq->rdev->wr_log[idx] = le;
 134 }
 135
 136 static int wr_log_show(struct seq_file *seq, void *v)
 137 {
 138         struct c4iw_dev *dev = seq->private;
 139         struct timespec prev_ts = {0, 0};
 140         struct wr_log_entry *lep;
 141         int prev_ts_set = 0;
 142         int idx, end;
 143
 144 #define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
 145
 146         idx = atomic_read(&dev->rdev.wr_log_idx) &
 147                 (dev->rdev.wr_log_size - 1);
 148         end = idx - 1;
 149         if (end < 0)
 150                 end = dev->rdev.wr_log_size - 1;
 151         lep = &dev->rdev.wr_log[idx];
 152         while (idx != end) {
 153                 if (lep->valid) {
 154                         if (!prev_ts_set) {
 155                                 prev_ts_set = 1;
 156                                 prev_ts = lep->poll_host_ts;
 157                         }
 158                         seq_printf(seq, "%04u: sec %lu nsec %lu qid %u opcode "
 159                                    "%u %s 0x%x host_wr_delta sec %lu nsec %lu "
 160                                    "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
 161                                    "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
 162                                    "cqe_poll_delta_ns %llu\n",
 163                                    idx,
 164                                    timespec_sub(lep->poll_host_ts,
 165                                                 prev_ts).tv_sec,
 166                                    timespec_sub(lep->poll_host_ts,
 167                                                 prev_ts).tv_nsec,
 168                                    lep->qid, lep->opcode,
 169                                    lep->opcode == FW_RI_RECEIVE ?
 170                                                         "msn" : "wrid",
 171                                    lep->wr_id,
 172                                    timespec_sub(lep->poll_host_ts,
 173                                                 lep->post_host_ts).tv_sec,
 174                                    timespec_sub(lep->poll_host_ts,
 175                                                 lep->post_host_ts).tv_nsec,
 176                                    lep->post_sge_ts, lep->cqe_sge_ts,
 177                                    lep->poll_sge_ts,
 178                                    ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
 179                                    ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
 180                         prev_ts = lep->poll_host_ts;
 181                 }
 182                 idx++;
 183                 if (idx > (dev->rdev.wr_log_size - 1))
 184                         idx = 0;
 185                 lep = &dev->rdev.wr_log[idx];
 186         }
 187 #undef ts2ns
 188         return 0;
 189 }
 190
 191 static int wr_log_open(struct inode *inode, struct file *file)
 192 {
 193         return single_open(file, wr_log_show, inode->i_private);
 194 }
 195
 196 static ssize_t wr_log_clear(struct file *file, const char __user *buf,
 197                             size_t count, loff_t *pos)
 198 {
 199         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 200         int i;
 201
 202         if (dev->rdev.wr_log)
 203                 for (i = 0; i < dev->rdev.wr_log_size; i++)
 204                         dev->rdev.wr_log[i].valid = 0;
 205         return count;
 206 }
 207
 208 static const struct file_operations wr_log_debugfs_fops = {
 209         .owner   = THIS_MODULE,
 210         .open    = wr_log_open,
 211         .release = single_release,
 212         .read    = seq_read,
 213         .llseek  = seq_lseek,
 214         .write   = wr_log_clear,
 215 };
 216
 217 static struct sockaddr_in zero_sin = {
 218         .sin_family = AF_INET,
 219 };
 220
 221 static struct sockaddr_in6 zero_sin6 = {
 222         .sin6_family = AF_INET6,
 223 };
 224
 225 static void set_ep_sin_addrs(struct c4iw_ep *ep,
 226                              struct sockaddr_in **lsin,
 227                              struct sockaddr_in **rsin,
 228                              struct sockaddr_in **m_lsin,
 229                              struct sockaddr_in **m_rsin)
 230 {
 231         struct iw_cm_id *id = ep->com.cm_id;
 232
 233         *lsin = (struct sockaddr_in *)&ep->com.local_addr;
 234         *rsin = (struct sockaddr_in *)&ep->com.remote_addr;
 235         if (id) {
 236                 *m_lsin = (struct sockaddr_in *)&id->m_local_addr;
 237                 *m_rsin = (struct sockaddr_in *)&id->m_remote_addr;
 238         } else {
 239                 *m_lsin = &zero_sin;
 240                 *m_rsin = &zero_sin;
 241         }
 242 }
 243
 244 static void set_ep_sin6_addrs(struct c4iw_ep *ep,
 245                               struct sockaddr_in6 **lsin6,
 246                               struct sockaddr_in6 **rsin6,
 247                               struct sockaddr_in6 **m_lsin6,
 248                               struct sockaddr_in6 **m_rsin6)
 249 {
 250         struct iw_cm_id *id = ep->com.cm_id;
 251
 252         *lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
 253         *rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
 254         if (id) {
 255                 *m_lsin6 = (struct sockaddr_in6 *)&id->m_local_addr;
 256                 *m_rsin6 = (struct sockaddr_in6 *)&id->m_remote_addr;
 257         } else {
 258                 *m_lsin6 = &zero_sin6;
 259                 *m_rsin6 = &zero_sin6;
 260         }
 261 }
 262
 263 static int dump_qp(int id, void *p, void *data)
 264 {
 265         struct c4iw_qp *qp = p;
 266         struct c4iw_debugfs_data *qpd = data;
 267         int space;
 268         int cc;
 269
 270         if (id != qp->wq.sq.qid)
 271                 return 0;
 272
 273         space = qpd->bufsize - qpd->pos - 1;
 274         if (space == 0)
 275                 return 1;
 276
 277         if (qp->ep) {
 278                 struct c4iw_ep *ep = qp->ep;
 279
 280                 if (ep->com.local_addr.ss_family == AF_INET) {
 281                         struct sockaddr_in *lsin;
 282                         struct sockaddr_in *rsin;
 283                         struct sockaddr_in *m_lsin;
 284                         struct sockaddr_in *m_rsin;
 285
 286                         set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 287                         cc = snprintf(qpd->buf + qpd->pos, space,
 288                                       "rc qp sq id %u rq id %u state %u "
 289                                       "onchip %u ep tid %u state %u "
 290                                       "%pI4:%u/%u->%pI4:%u/%u\n",
 291                                       qp->wq.sq.qid, qp->wq.rq.qid,
 292                                       (int)qp->attr.state,
 293                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 294                                       ep->hwtid, (int)ep->com.state,
 295                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 296                                       ntohs(m_lsin->sin_port),
 297                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 298                                       ntohs(m_rsin->sin_port));
 299                 } else {
 300                         struct sockaddr_in6 *lsin6;
 301                         struct sockaddr_in6 *rsin6;
 302                         struct sockaddr_in6 *m_lsin6;
 303                         struct sockaddr_in6 *m_rsin6;
 304
 305                         set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
 306                                           &m_rsin6);
 307                         cc = snprintf(qpd->buf + qpd->pos, space,
 308                                       "rc qp sq id %u rq id %u state %u "
 309                                       "onchip %u ep tid %u state %u "
 310                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 311                                       qp->wq.sq.qid, qp->wq.rq.qid,
 312                                       (int)qp->attr.state,
 313                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 314                                       ep->hwtid, (int)ep->com.state,
 315                                       &lsin6->sin6_addr,
 316                                       ntohs(lsin6->sin6_port),
 317                                       ntohs(m_lsin6->sin6_port),
 318                                       &rsin6->sin6_addr,
 319                                       ntohs(rsin6->sin6_port),
 320                                       ntohs(m_rsin6->sin6_port));
 321                 }
 322         } else
 323                 cc = snprintf(qpd->buf + qpd->pos, space,
 324                              "qp sq id %u rq id %u state %u onchip %u\n",
 325                               qp->wq.sq.qid, qp->wq.rq.qid,
 326                               (int)qp->attr.state,
 327                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 328         if (cc < space)
 329                 qpd->pos += cc;
 330         return 0;
 331 }
 332
 333 static int qp_release(struct inode *inode, struct file *file)
 334 {
 335         struct c4iw_debugfs_data *qpd = file->private_data;
 336         if (!qpd) {
 337                 pr_info("%s null qpd?\n", __func__);
 338                 return 0;
 339         }
 340         vfree(qpd->buf);
 341         kfree(qpd);
 342         return 0;
 343 }
 344
 345 static int qp_open(struct inode *inode, struct file *file)
 346 {
 347         struct c4iw_debugfs_data *qpd;
 348         int count = 1;
 349
 350         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 351         if (!qpd)
 352                 return -ENOMEM;
 353
 354         qpd->devp = inode->i_private;
 355         qpd->pos = 0;
 356
 357         spin_lock_irq(&qpd->devp->lock);
 358         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 359         spin_unlock_irq(&qpd->devp->lock);
 360
 361         qpd->bufsize = count * 180;
 362         qpd->buf = vmalloc(qpd->bufsize);
 363         if (!qpd->buf) {
 364                 kfree(qpd);
 365                 return -ENOMEM;
 366         }
 367
 368         spin_lock_irq(&qpd->devp->lock);
 369         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 370         spin_unlock_irq(&qpd->devp->lock);
 371
 372         qpd->buf[qpd->pos++] = 0;
 373         file->private_data = qpd;
 374         return 0;
 375 }
 376
 377 static const struct file_operations qp_debugfs_fops = {
 378         .owner   = THIS_MODULE,
 379         .open    = qp_open,
 380         .release = qp_release,
 381         .read    = debugfs_read,
 382         .llseek  = default_llseek,
 383 };
 384
 385 static int dump_stag(int id, void *p, void *data)
 386 {
 387         struct c4iw_debugfs_data *stagd = data;
 388         int space;
 389         int cc;
 390         struct fw_ri_tpte tpte;
 391         int ret;
 392
 393         space = stagd->bufsize - stagd->pos - 1;
 394         if (space == 0)
 395                 return 1;
 396
 397         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 398                               (__be32 *)&tpte);
 399         if (ret) {
 400                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 401                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 402                 return ret;
 403         }
 404         cc = snprintf(stagd->buf + stagd->pos, space,
 405                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 406                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 407                       (u32)id<<8,
 408                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 409                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 410                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 411                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 412                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 413                       FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 414                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 415                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 416         if (cc < space)
 417                 stagd->pos += cc;
 418         return 0;
 419 }
 420
 421 static int stag_release(struct inode *inode, struct file *file)
 422 {
 423         struct c4iw_debugfs_data *stagd = file->private_data;
 424         if (!stagd) {
 425                 pr_info("%s null stagd?\n", __func__);
 426                 return 0;
 427         }
 428         vfree(stagd->buf);
 429         kfree(stagd);
 430         return 0;
 431 }
 432
 433 static int stag_open(struct inode *inode, struct file *file)
 434 {
 435         struct c4iw_debugfs_data *stagd;
 436         int ret = 0;
 437         int count = 1;
 438
 439         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 440         if (!stagd) {
 441                 ret = -ENOMEM;
 442                 goto out;
 443         }
 444         stagd->devp = inode->i_private;
 445         stagd->pos = 0;
 446
 447         spin_lock_irq(&stagd->devp->lock);
 448         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 449         spin_unlock_irq(&stagd->devp->lock);
 450
 451         stagd->bufsize = count * 256;
 452         stagd->buf = vmalloc(stagd->bufsize);
 453         if (!stagd->buf) {
 454                 ret = -ENOMEM;
 455                 goto err1;
 456         }
 457
 458         spin_lock_irq(&stagd->devp->lock);
 459         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 460         spin_unlock_irq(&stagd->devp->lock);
 461
 462         stagd->buf[stagd->pos++] = 0;
 463         file->private_data = stagd;
 464         goto out;
 465 err1:
 466         kfree(stagd);
 467 out:
 468         return ret;
 469 }
 470
 471 static const struct file_operations stag_debugfs_fops = {
 472         .owner   = THIS_MODULE,
 473         .open    = stag_open,
 474         .release = stag_release,
 475         .read    = debugfs_read,
 476         .llseek  = default_llseek,
 477 };
 478
 479 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 480
 481 static int stats_show(struct seq_file *seq, void *v)
 482 {
 483         struct c4iw_dev *dev = seq->private;
 484
 485         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 486                    "Max", "Fail");
 487         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 488                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 489                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 490         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 491                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 492                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 493         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 494                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 495                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 496         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 497                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 498                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 499         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 500                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 501                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 502         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 503                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 504                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 505         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 506         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 507         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 508         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 509                    db_state_str[dev->db_state],
 510                    dev->rdev.stats.db_state_transitions,
 511                    dev->rdev.stats.db_fc_interruptions);
 512         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 513         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 514                    dev->rdev.stats.act_ofld_conn_fails);
 515         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 516                    dev->rdev.stats.pas_ofld_conn_fails);
 517         seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 518         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 519         return 0;
 520 }
 521
 522 static int stats_open(struct inode *inode, struct file *file)
 523 {
 524         return single_open(file, stats_show, inode->i_private);
 525 }
 526
 527 static ssize_t stats_clear(struct file *file, const char __user *buf,
 528                 size_t count, loff_t *pos)
 529 {
 530         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 531
 532         mutex_lock(&dev->rdev.stats.lock);
 533         dev->rdev.stats.pd.max = 0;
 534         dev->rdev.stats.pd.fail = 0;
 535         dev->rdev.stats.qid.max = 0;
 536         dev->rdev.stats.qid.fail = 0;
 537         dev->rdev.stats.stag.max = 0;
 538         dev->rdev.stats.stag.fail = 0;
 539         dev->rdev.stats.pbl.max = 0;
 540         dev->rdev.stats.pbl.fail = 0;
 541         dev->rdev.stats.rqt.max = 0;
 542         dev->rdev.stats.rqt.fail = 0;
 543         dev->rdev.stats.ocqp.max = 0;
 544         dev->rdev.stats.ocqp.fail = 0;
 545         dev->rdev.stats.db_full = 0;
 546         dev->rdev.stats.db_empty = 0;
 547         dev->rdev.stats.db_drop = 0;
 548         dev->rdev.stats.db_state_transitions = 0;
 549         dev->rdev.stats.tcam_full = 0;
 550         dev->rdev.stats.act_ofld_conn_fails = 0;
 551         dev->rdev.stats.pas_ofld_conn_fails = 0;
 552         mutex_unlock(&dev->rdev.stats.lock);
 553         return count;
 554 }
 555
 556 static const struct file_operations stats_debugfs_fops = {
 557         .owner   = THIS_MODULE,
 558         .open    = stats_open,
 559         .release = single_release,
 560         .read    = seq_read,
 561         .llseek  = seq_lseek,
 562         .write   = stats_clear,
 563 };
 564
 565 static int dump_ep(int id, void *p, void *data)
 566 {
 567         struct c4iw_ep *ep = p;
 568         struct c4iw_debugfs_data *epd = data;
 569         int space;
 570         int cc;
 571
 572         space = epd->bufsize - epd->pos - 1;
 573         if (space == 0)
 574                 return 1;
 575
 576         if (ep->com.local_addr.ss_family == AF_INET) {
 577                 struct sockaddr_in *lsin;
 578                 struct sockaddr_in *rsin;
 579                 struct sockaddr_in *m_lsin;
 580                 struct sockaddr_in *m_rsin;
 581
 582                 set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 583                 cc = snprintf(epd->buf + epd->pos, space,
 584                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 585                               "history 0x%lx hwtid %d atid %d "
 586                               "conn_na %u abort_na %u "
 587                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 588                               ep, ep->com.cm_id, ep->com.qp,
 589                               (int)ep->com.state, ep->com.flags,
 590                               ep->com.history, ep->hwtid, ep->atid,
 591                               ep->stats.connect_neg_adv,
 592                               ep->stats.abort_neg_adv,
 593                               &lsin->sin_addr, ntohs(lsin->sin_port),
 594                               ntohs(m_lsin->sin_port),
 595                               &rsin->sin_addr, ntohs(rsin->sin_port),
 596                               ntohs(m_rsin->sin_port));
 597         } else {
 598                 struct sockaddr_in6 *lsin6;
 599                 struct sockaddr_in6 *rsin6;
 600                 struct sockaddr_in6 *m_lsin6;
 601                 struct sockaddr_in6 *m_rsin6;
 602
 603                 set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
 604                 cc = snprintf(epd->buf + epd->pos, space,
 605                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 606                               "history 0x%lx hwtid %d atid %d "
 607                               "conn_na %u abort_na %u "
 608                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 609                               ep, ep->com.cm_id, ep->com.qp,
 610                               (int)ep->com.state, ep->com.flags,
 611                               ep->com.history, ep->hwtid, ep->atid,
 612                               ep->stats.connect_neg_adv,
 613                               ep->stats.abort_neg_adv,
 614                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 615                               ntohs(m_lsin6->sin6_port),
 616                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 617                               ntohs(m_rsin6->sin6_port));
 618         }
 619         if (cc < space)
 620                 epd->pos += cc;
 621         return 0;
 622 }
 623
 624 static int dump_listen_ep(int id, void *p, void *data)
 625 {
 626         struct c4iw_listen_ep *ep = p;
 627         struct c4iw_debugfs_data *epd = data;
 628         int space;
 629         int cc;
 630
 631         space = epd->bufsize - epd->pos - 1;
 632         if (space == 0)
 633                 return 1;
 634
 635         if (ep->com.local_addr.ss_family == AF_INET) {
 636                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 637                         &ep->com.cm_id->local_addr;
 638                 struct sockaddr_in *m_lsin = (struct sockaddr_in *)
 639                         &ep->com.cm_id->m_local_addr;
 640
 641                 cc = snprintf(epd->buf + epd->pos, space,
 642                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 643                               "backlog %d %pI4:%d/%d\n",
 644                               ep, ep->com.cm_id, (int)ep->com.state,
 645                               ep->com.flags, ep->stid, ep->backlog,
 646                               &lsin->sin_addr, ntohs(lsin->sin_port),
 647                               ntohs(m_lsin->sin_port));
 648         } else {
 649                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 650                         &ep->com.cm_id->local_addr;
 651                 struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
 652                         &ep->com.cm_id->m_local_addr;
 653
 654                 cc = snprintf(epd->buf + epd->pos, space,
 655                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 656                               "backlog %d %pI6:%d/%d\n",
 657                               ep, ep->com.cm_id, (int)ep->com.state,
 658                               ep->com.flags, ep->stid, ep->backlog,
 659                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 660                               ntohs(m_lsin6->sin6_port));
 661         }
 662         if (cc < space)
 663                 epd->pos += cc;
 664         return 0;
 665 }
 666
 667 static int ep_release(struct inode *inode, struct file *file)
 668 {
 669         struct c4iw_debugfs_data *epd = file->private_data;
 670         if (!epd) {
 671                 pr_info("%s null qpd?\n", __func__);
 672                 return 0;
 673         }
 674         vfree(epd->buf);
 675         kfree(epd);
 676         return 0;
 677 }
 678
 679 static int ep_open(struct inode *inode, struct file *file)
 680 {
 681         struct c4iw_debugfs_data *epd;
 682         int ret = 0;
 683         int count = 1;
 684
 685         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 686         if (!epd) {
 687                 ret = -ENOMEM;
 688                 goto out;
 689         }
 690         epd->devp = inode->i_private;
 691         epd->pos = 0;
 692
 693         spin_lock_irq(&epd->devp->lock);
 694         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 695         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 696         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 697         spin_unlock_irq(&epd->devp->lock);
 698
 699         epd->bufsize = count * 240;
 700         epd->buf = vmalloc(epd->bufsize);
 701         if (!epd->buf) {
 702                 ret = -ENOMEM;
 703                 goto err1;
 704         }
 705
 706         spin_lock_irq(&epd->devp->lock);
 707         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 708         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 709         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 710         spin_unlock_irq(&epd->devp->lock);
 711
 712         file->private_data = epd;
 713         goto out;
 714 err1:
 715         kfree(epd);
 716 out:
 717         return ret;
 718 }
 719
 720 static const struct file_operations ep_debugfs_fops = {
 721         .owner   = THIS_MODULE,
 722         .open    = ep_open,
 723         .release = ep_release,
 724         .read    = debugfs_read,
 725 };
 726
 727 static int setup_debugfs(struct c4iw_dev *devp)
 728 {
 729         if (!devp->debugfs_root)
 730                 return -1;
 731
 732         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 733                                  (void *)devp, &qp_debugfs_fops, 4096);
 734
 735         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 736                                  (void *)devp, &stag_debugfs_fops, 4096);
 737
 738         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 739                                  (void *)devp, &stats_debugfs_fops, 4096);
 740
 741         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 742                                  (void *)devp, &ep_debugfs_fops, 4096);
 743
 744         if (c4iw_wr_log)
 745                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 746                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 747         return 0;
 748 }
 749
 750 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 751                                struct c4iw_dev_ucontext *uctx)
 752 {
 753         struct list_head *pos, *nxt;
 754         struct c4iw_qid_list *entry;
 755
 756         mutex_lock(&uctx->lock);
 757         list_for_each_safe(pos, nxt, &uctx->qpids) {
 758                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 759                 list_del_init(&entry->entry);
 760                 if (!(entry->qid & rdev->qpmask)) {
 761                         c4iw_put_resource(&rdev->resource.qid_table,
 762                                           entry->qid);
 763                         mutex_lock(&rdev->stats.lock);
 764                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 765                         mutex_unlock(&rdev->stats.lock);
 766                 }
 767                 kfree(entry);
 768         }
 769
 770         list_for_each_safe(pos, nxt, &uctx->qpids) {
 771                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 772                 list_del_init(&entry->entry);
 773                 kfree(entry);
 774         }
 775         mutex_unlock(&uctx->lock);
 776 }
 777
 778 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 779                             struct c4iw_dev_ucontext *uctx)
 780 {
 781         INIT_LIST_HEAD(&uctx->qpids);
 782         INIT_LIST_HEAD(&uctx->cqids);
 783         mutex_init(&uctx->lock);
 784 }
 785
 786 /* Caller takes care of locking if needed */
 787 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 788 {
 789         int err;
 790
 791         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 792
 793         /*
 794          * This implementation assumes udb_density == ucq_density!  Eventually
 795          * we might need to support this but for now fail the open. Also the
 796          * cqid and qpid range must match for now.
 797          */
 798         if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 799                 pr_err("%s: unsupported udb/ucq densities %u/%u\n",
 800                        pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 801                        rdev->lldi.ucq_density);
 802                 return -EINVAL;
 803         }
 804         if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 805             rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 806                 pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
 807                        pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 808                        rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 809                        rdev->lldi.vr->cq.size);
 810                 return -EINVAL;
 811         }
 812
 813         rdev->qpmask = rdev->lldi.udb_density - 1;
 814         rdev->cqmask = rdev->lldi.ucq_density - 1;
 815         pr_debug("%s 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",
 816                  __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 817                  rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 818                  rdev->lldi.vr->pbl.start,
 819                  rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 820                  rdev->lldi.vr->rq.size,
 821                  rdev->lldi.vr->qp.start,
 822                  rdev->lldi.vr->qp.size,
 823                  rdev->lldi.vr->cq.start,
 824                  rdev->lldi.vr->cq.size);
 825         pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
 826                  &rdev->lldi.pdev->resource[2],
 827                  rdev->lldi.db_reg, rdev->lldi.gts_reg,
 828                  rdev->qpmask, rdev->cqmask);
 829
 830         if (c4iw_num_stags(rdev) == 0)
 831                 return -EINVAL;
 832
 833         rdev->stats.pd.total = T4_MAX_NUM_PD;
 834         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 835         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 836         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 837         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 838         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 839
 840         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 841         if (err) {
 842                 pr_err("error %d initializing resources\n", err);
 843                 return err;
 844         }
 845         err = c4iw_pblpool_create(rdev);
 846         if (err) {
 847                 pr_err("error %d initializing pbl pool\n", err);
 848                 goto destroy_resource;
 849         }
 850         err = c4iw_rqtpool_create(rdev);
 851         if (err) {
 852                 pr_err("error %d initializing rqt pool\n", err);
 853                 goto destroy_pblpool;
 854         }
 855         err = c4iw_ocqp_pool_create(rdev);
 856         if (err) {
 857                 pr_err("error %d initializing ocqp pool\n", err);
 858                 goto destroy_rqtpool;
 859         }
 860         rdev->status_page = (struct t4_dev_status_page *)
 861                             __get_free_page(GFP_KERNEL);
 862         if (!rdev->status_page) {
 863                 err = -ENOMEM;
 864                 goto destroy_ocqp_pool;
 865         }
 866         rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
 867         rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
 868         rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
 869         rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
 870
 871         if (c4iw_wr_log) {
 872                 rdev->wr_log = kzalloc((1 << c4iw_wr_log_size_order) *
 873                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 874                 if (rdev->wr_log) {
 875                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 876                         atomic_set(&rdev->wr_log_idx, 0);
 877                 }
 878         }
 879
 880         rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
 881         if (!rdev->free_workq) {
 882                 err = -ENOMEM;
 883                 goto err_free_status_page;
 884         }
 885
 886         rdev->status_page->db_off = 0;
 887
 888         return 0;
 889 err_free_status_page:
 890         free_page((unsigned long)rdev->status_page);
 891 destroy_ocqp_pool:
 892         c4iw_ocqp_pool_destroy(rdev);
 893 destroy_rqtpool:
 894         c4iw_rqtpool_destroy(rdev);
 895 destroy_pblpool:
 896         c4iw_pblpool_destroy(rdev);
 897 destroy_resource:
 898         c4iw_destroy_resource(&rdev->resource);
 899         return err;
 900 }
 901
 902 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 903 {
 904         destroy_workqueue(rdev->free_workq);
 905         kfree(rdev->wr_log);
 906         free_page((unsigned long)rdev->status_page);
 907         c4iw_pblpool_destroy(rdev);
 908         c4iw_rqtpool_destroy(rdev);
 909         c4iw_destroy_resource(&rdev->resource);
 910 }
 911
 912 static void c4iw_dealloc(struct uld_ctx *ctx)
 913 {
 914         c4iw_rdev_close(&ctx->dev->rdev);
 915         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->cqidr));
 916         idr_destroy(&ctx->dev->cqidr);
 917         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->qpidr));
 918         idr_destroy(&ctx->dev->qpidr);
 919         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->mmidr));
 920         idr_destroy(&ctx->dev->mmidr);
 921         wait_event(ctx->dev->wait, idr_is_empty(&ctx->dev->hwtid_idr));
 922         idr_destroy(&ctx->dev->hwtid_idr);
 923         idr_destroy(&ctx->dev->stid_idr);
 924         idr_destroy(&ctx->dev->atid_idr);
 925         if (ctx->dev->rdev.bar2_kva)
 926                 iounmap(ctx->dev->rdev.bar2_kva);
 927         if (ctx->dev->rdev.oc_mw_kva)
 928                 iounmap(ctx->dev->rdev.oc_mw_kva);
 929         ib_dealloc_device(&ctx->dev->ibdev);
 930         ctx->dev = NULL;
 931 }
 932
 933 static void c4iw_remove(struct uld_ctx *ctx)
 934 {
 935         pr_debug("%s c4iw_dev %p\n", __func__,  ctx->dev);
 936         c4iw_unregister_device(ctx->dev);
 937         c4iw_dealloc(ctx);
 938 }
 939
 940 static int rdma_supported(const struct cxgb4_lld_info *infop)
 941 {
 942         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 943                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 944                infop->vr->cq.size > 0;
 945 }
 946
 947 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 948 {
 949         struct c4iw_dev *devp;
 950         int ret;
 951
 952         if (!rdma_supported(infop)) {
 953                 pr_info("%s: RDMA not supported on this device\n",
 954                         pci_name(infop->pdev));
 955                 return ERR_PTR(-ENOSYS);
 956         }
 957         if (!ocqp_supported(infop))
 958                 pr_info("%s: On-Chip Queues not supported on this device\n",
 959                         pci_name(infop->pdev));
 960
 961         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 962         if (!devp) {
 963                 pr_err("Cannot allocate ib device\n");
 964                 return ERR_PTR(-ENOMEM);
 965         }
 966         devp->rdev.lldi = *infop;
 967
 968         /* init various hw-queue params based on lld info */
 969         pr_debug("%s: Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 970                  __func__, devp->rdev.lldi.sge_ingpadboundary,
 971                  devp->rdev.lldi.sge_egrstatuspagesize);
 972
 973         devp->rdev.hw_queue.t4_eq_status_entries =
 974                 devp->rdev.lldi.sge_ingpadboundary > 64 ? 2 : 1;
 975         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 976         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 977         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 978                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 979         devp->rdev.hw_queue.t4_max_sq_size =
 980                 devp->rdev.hw_queue.t4_max_eq_size -
 981                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 982         devp->rdev.hw_queue.t4_max_qp_depth =
 983                 devp->rdev.hw_queue.t4_max_rq_size;
 984         devp->rdev.hw_queue.t4_max_cq_depth =
 985                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 986         devp->rdev.hw_queue.t4_stat_len =
 987                 devp->rdev.lldi.sge_egrstatuspagesize;
 988
 989         /*
 990          * For T5/T6 devices, we map all of BAR2 with WC.
 991          * For T4 devices with onchip qp mem, we map only that part
 992          * of BAR2 with WC.
 993          */
 994         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 995         if (!is_t4(devp->rdev.lldi.adapter_type)) {
 996                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 997                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 998                 if (!devp->rdev.bar2_kva) {
 999                         pr_err("Unable to ioremap BAR2\n");
1000                         ib_dealloc_device(&devp->ibdev);
1001                         return ERR_PTR(-EINVAL);
1002                 }
1003         } else if (ocqp_supported(infop)) {
1004                 devp->rdev.oc_mw_pa =
1005                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
1006                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
1007                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1008                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1009                         devp->rdev.lldi.vr->ocq.size);
1010                 if (!devp->rdev.oc_mw_kva) {
1011                         pr_err("Unable to ioremap onchip mem\n");
1012                         ib_dealloc_device(&devp->ibdev);
1013                         return ERR_PTR(-EINVAL);
1014                 }
1015         }
1016
1017         pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1018                  devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1019                  devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1020
1021         ret = c4iw_rdev_open(&devp->rdev);
1022         if (ret) {
1023                 pr_err("Unable to open CXIO rdev err %d\n", ret);
1024                 ib_dealloc_device(&devp->ibdev);
1025                 return ERR_PTR(ret);
1026         }
1027
1028         idr_init(&devp->cqidr);
1029         idr_init(&devp->qpidr);
1030         idr_init(&devp->mmidr);
1031         idr_init(&devp->hwtid_idr);
1032         idr_init(&devp->stid_idr);
1033         idr_init(&devp->atid_idr);
1034         spin_lock_init(&devp->lock);
1035         mutex_init(&devp->rdev.stats.lock);
1036         mutex_init(&devp->db_mutex);
1037         INIT_LIST_HEAD(&devp->db_fc_list);
1038         init_waitqueue_head(&devp->wait);
1039         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1040
1041         if (c4iw_debugfs_root) {
1042                 devp->debugfs_root = debugfs_create_dir(
1043                                         pci_name(devp->rdev.lldi.pdev),
1044                                         c4iw_debugfs_root);
1045                 setup_debugfs(devp);
1046         }
1047
1048
1049         return devp;
1050 }
1051
1052 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1053 {
1054         struct uld_ctx *ctx;
1055         static int vers_printed;
1056         int i;
1057
1058         if (!vers_printed++)
1059                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1060                         DRV_VERSION);
1061
1062         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1063         if (!ctx) {
1064                 ctx = ERR_PTR(-ENOMEM);
1065                 goto out;
1066         }
1067         ctx->lldi = *infop;
1068
1069         pr_debug("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1070                  __func__, pci_name(ctx->lldi.pdev),
1071                  ctx->lldi.nchan, ctx->lldi.nrxq,
1072                  ctx->lldi.ntxq, ctx->lldi.nports);
1073
1074         mutex_lock(&dev_mutex);
1075         list_add_tail(&ctx->entry, &uld_ctx_list);
1076         mutex_unlock(&dev_mutex);
1077
1078         for (i = 0; i < ctx->lldi.nrxq; i++)
1079                 pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1080 out:
1081         return ctx;
1082 }
1083
1084 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1085                                                  const __be64 *rsp,
1086                                                  u32 pktshift)
1087 {
1088         struct sk_buff *skb;
1089
1090         /*
1091          * Allocate space for cpl_pass_accept_req which will be synthesized by
1092          * driver. Once the driver synthesizes the request the skb will go
1093          * through the regular cpl_pass_accept_req processing.
1094          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1095          * cpl_rx_pkt.
1096          */
1097         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1098                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1099         if (unlikely(!skb))
1100                 return NULL;
1101
1102          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1103                    sizeof(struct rss_header) - pktshift);
1104
1105         /*
1106          * This skb will contain:
1107          *   rss_header from the rspq descriptor (1 flit)
1108          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1109          *   space for the difference between the size of an
1110          *      rx_pkt and pass_accept_req cpl (1 flit)
1111          *   the packet data from the gl
1112          */
1113         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1114                                 sizeof(struct rss_header));
1115         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1116                                        sizeof(struct cpl_pass_accept_req),
1117                                        gl->va + pktshift,
1118                                        gl->tot_len - pktshift);
1119         return skb;
1120 }
1121
1122 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1123                            const __be64 *rsp)
1124 {
1125         unsigned int opcode = *(u8 *)rsp;
1126         struct sk_buff *skb;
1127
1128         if (opcode != CPL_RX_PKT)
1129                 goto out;
1130
1131         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1132         if (skb == NULL)
1133                 goto out;
1134
1135         if (c4iw_handlers[opcode] == NULL) {
1136                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1137                 kfree_skb(skb);
1138                 goto out;
1139         }
1140         c4iw_handlers[opcode](dev, skb);
1141         return 1;
1142 out:
1143         return 0;
1144 }
1145
1146 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1147                         const struct pkt_gl *gl)
1148 {
1149         struct uld_ctx *ctx = handle;
1150         struct c4iw_dev *dev = ctx->dev;
1151         struct sk_buff *skb;
1152         u8 opcode;
1153
1154         if (gl == NULL) {
1155                 /* omit RSS and rsp_ctrl at end of descriptor */
1156                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1157
1158                 skb = alloc_skb(256, GFP_ATOMIC);
1159                 if (!skb)
1160                         goto nomem;
1161                 __skb_put(skb, len);
1162                 skb_copy_to_linear_data(skb, &rsp[1], len);
1163         } else if (gl == CXGB4_MSG_AN) {
1164                 const struct rsp_ctrl *rc = (void *)rsp;
1165
1166                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1167                 c4iw_ev_handler(dev, qid);
1168                 return 0;
1169         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1170                 if (recv_rx_pkt(dev, gl, rsp))
1171                         return 0;
1172
1173                 pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1174                         pci_name(ctx->lldi.pdev), gl->va,
1175                         be64_to_cpu(*rsp),
1176                         be64_to_cpu(*(__force __be64 *)gl->va),
1177                         gl->tot_len);
1178
1179                 return 0;
1180         } else {
1181                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1182                 if (unlikely(!skb))
1183                         goto nomem;
1184         }
1185
1186         opcode = *(u8 *)rsp;
1187         if (c4iw_handlers[opcode]) {
1188                 c4iw_handlers[opcode](dev, skb);
1189         } else {
1190                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1191                 kfree_skb(skb);
1192         }
1193
1194         return 0;
1195 nomem:
1196         return -1;
1197 }
1198
1199 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1200 {
1201         struct uld_ctx *ctx = handle;
1202
1203         pr_debug("%s new_state %u\n", __func__, new_state);
1204         switch (new_state) {
1205         case CXGB4_STATE_UP:
1206                 pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1207                 if (!ctx->dev) {
1208                         int ret;
1209
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                         ret = c4iw_register_device(ctx->dev);
1219                         if (ret) {
1220                                 pr_err("%s: RDMA registration failed: %d\n",
1221                                        pci_name(ctx->lldi.pdev), ret);
1222                                 c4iw_dealloc(ctx);
1223                         }
1224                 }
1225                 break;
1226         case CXGB4_STATE_DOWN:
1227                 pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1228                 if (ctx->dev)
1229                         c4iw_remove(ctx);
1230                 break;
1231         case CXGB4_STATE_START_RECOVERY:
1232                 pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1233                 if (ctx->dev) {
1234                         struct ib_event event;
1235
1236                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1237                         memset(&event, 0, sizeof event);
1238                         event.event  = IB_EVENT_DEVICE_FATAL;
1239                         event.device = &ctx->dev->ibdev;
1240                         ib_dispatch_event(&event);
1241                         c4iw_remove(ctx);
1242                 }
1243                 break;
1244         case CXGB4_STATE_DETACH:
1245                 pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1246                 if (ctx->dev)
1247                         c4iw_remove(ctx);
1248                 break;
1249         }
1250         return 0;
1251 }
1252
1253 static int disable_qp_db(int id, void *p, void *data)
1254 {
1255         struct c4iw_qp *qp = p;
1256
1257         t4_disable_wq_db(&qp->wq);
1258         return 0;
1259 }
1260
1261 static void stop_queues(struct uld_ctx *ctx)
1262 {
1263         unsigned long flags;
1264
1265         spin_lock_irqsave(&ctx->dev->lock, flags);
1266         ctx->dev->rdev.stats.db_state_transitions++;
1267         ctx->dev->db_state = STOPPED;
1268         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1269                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1270         else
1271                 ctx->dev->rdev.status_page->db_off = 1;
1272         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1273 }
1274
1275 static int enable_qp_db(int id, void *p, void *data)
1276 {
1277         struct c4iw_qp *qp = p;
1278
1279         t4_enable_wq_db(&qp->wq);
1280         return 0;
1281 }
1282
1283 static void resume_rc_qp(struct c4iw_qp *qp)
1284 {
1285         spin_lock(&qp->lock);
1286         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1287         qp->wq.sq.wq_pidx_inc = 0;
1288         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1289         qp->wq.rq.wq_pidx_inc = 0;
1290         spin_unlock(&qp->lock);
1291 }
1292
1293 static void resume_a_chunk(struct uld_ctx *ctx)
1294 {
1295         int i;
1296         struct c4iw_qp *qp;
1297
1298         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1299                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1300                                       db_fc_entry);
1301                 list_del_init(&qp->db_fc_entry);
1302                 resume_rc_qp(qp);
1303                 if (list_empty(&ctx->dev->db_fc_list))
1304                         break;
1305         }
1306 }
1307
1308 static void resume_queues(struct uld_ctx *ctx)
1309 {
1310         spin_lock_irq(&ctx->dev->lock);
1311         if (ctx->dev->db_state != STOPPED)
1312                 goto out;
1313         ctx->dev->db_state = FLOW_CONTROL;
1314         while (1) {
1315                 if (list_empty(&ctx->dev->db_fc_list)) {
1316                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1317                         ctx->dev->db_state = NORMAL;
1318                         ctx->dev->rdev.stats.db_state_transitions++;
1319                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1320                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1321                                              NULL);
1322                         } else {
1323                                 ctx->dev->rdev.status_page->db_off = 0;
1324                         }
1325                         break;
1326                 } else {
1327                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1328                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1329                                DB_FC_DRAIN_THRESH)) {
1330                                 resume_a_chunk(ctx);
1331                         }
1332                         if (!list_empty(&ctx->dev->db_fc_list)) {
1333                                 spin_unlock_irq(&ctx->dev->lock);
1334                                 if (DB_FC_RESUME_DELAY) {
1335                                         set_current_state(TASK_UNINTERRUPTIBLE);
1336                                         schedule_timeout(DB_FC_RESUME_DELAY);
1337                                 }
1338                                 spin_lock_irq(&ctx->dev->lock);
1339                                 if (ctx->dev->db_state != FLOW_CONTROL)
1340                                         break;
1341                         }
1342                 }
1343         }
1344 out:
1345         if (ctx->dev->db_state != NORMAL)
1346                 ctx->dev->rdev.stats.db_fc_interruptions++;
1347         spin_unlock_irq(&ctx->dev->lock);
1348 }
1349
1350 struct qp_list {
1351         unsigned idx;
1352         struct c4iw_qp **qps;
1353 };
1354
1355 static int add_and_ref_qp(int id, void *p, void *data)
1356 {
1357         struct qp_list *qp_listp = data;
1358         struct c4iw_qp *qp = p;
1359
1360         c4iw_qp_add_ref(&qp->ibqp);
1361         qp_listp->qps[qp_listp->idx++] = qp;
1362         return 0;
1363 }
1364
1365 static int count_qps(int id, void *p, void *data)
1366 {
1367         unsigned *countp = data;
1368         (*countp)++;
1369         return 0;
1370 }
1371
1372 static void deref_qps(struct qp_list *qp_list)
1373 {
1374         int idx;
1375
1376         for (idx = 0; idx < qp_list->idx; idx++)
1377                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1378 }
1379
1380 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1381 {
1382         int idx;
1383         int ret;
1384
1385         for (idx = 0; idx < qp_list->idx; idx++) {
1386                 struct c4iw_qp *qp = qp_list->qps[idx];
1387
1388                 spin_lock_irq(&qp->rhp->lock);
1389                 spin_lock(&qp->lock);
1390                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1391                                           qp->wq.sq.qid,
1392                                           t4_sq_host_wq_pidx(&qp->wq),
1393                                           t4_sq_wq_size(&qp->wq));
1394                 if (ret) {
1395                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1396                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1397                         spin_unlock(&qp->lock);
1398                         spin_unlock_irq(&qp->rhp->lock);
1399                         return;
1400                 }
1401                 qp->wq.sq.wq_pidx_inc = 0;
1402
1403                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1404                                           qp->wq.rq.qid,
1405                                           t4_rq_host_wq_pidx(&qp->wq),
1406                                           t4_rq_wq_size(&qp->wq));
1407
1408                 if (ret) {
1409                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1410                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1411                         spin_unlock(&qp->lock);
1412                         spin_unlock_irq(&qp->rhp->lock);
1413                         return;
1414                 }
1415                 qp->wq.rq.wq_pidx_inc = 0;
1416                 spin_unlock(&qp->lock);
1417                 spin_unlock_irq(&qp->rhp->lock);
1418
1419                 /* Wait for the dbfifo to drain */
1420                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1421                         set_current_state(TASK_UNINTERRUPTIBLE);
1422                         schedule_timeout(usecs_to_jiffies(10));
1423                 }
1424         }
1425 }
1426
1427 static void recover_queues(struct uld_ctx *ctx)
1428 {
1429         int count = 0;
1430         struct qp_list qp_list;
1431         int ret;
1432
1433         /* slow everybody down */
1434         set_current_state(TASK_UNINTERRUPTIBLE);
1435         schedule_timeout(usecs_to_jiffies(1000));
1436
1437         /* flush the SGE contexts */
1438         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1439         if (ret) {
1440                 pr_err("%s: Fatal error - DB overflow recovery failed\n",
1441                        pci_name(ctx->lldi.pdev));
1442                 return;
1443         }
1444
1445         /* Count active queues so we can build a list of queues to recover */
1446         spin_lock_irq(&ctx->dev->lock);
1447         WARN_ON(ctx->dev->db_state != STOPPED);
1448         ctx->dev->db_state = RECOVERY;
1449         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1450
1451         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1452         if (!qp_list.qps) {
1453                 spin_unlock_irq(&ctx->dev->lock);
1454                 return;
1455         }
1456         qp_list.idx = 0;
1457
1458         /* add and ref each qp so it doesn't get freed */
1459         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1460
1461         spin_unlock_irq(&ctx->dev->lock);
1462
1463         /* now traverse the list in a safe context to recover the db state*/
1464         recover_lost_dbs(ctx, &qp_list);
1465
1466         /* we're almost done!  deref the qps and clean up */
1467         deref_qps(&qp_list);
1468         kfree(qp_list.qps);
1469
1470         spin_lock_irq(&ctx->dev->lock);
1471         WARN_ON(ctx->dev->db_state != RECOVERY);
1472         ctx->dev->db_state = STOPPED;
1473         spin_unlock_irq(&ctx->dev->lock);
1474 }
1475
1476 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1477 {
1478         struct uld_ctx *ctx = handle;
1479
1480         switch (control) {
1481         case CXGB4_CONTROL_DB_FULL:
1482                 stop_queues(ctx);
1483                 ctx->dev->rdev.stats.db_full++;
1484                 break;
1485         case CXGB4_CONTROL_DB_EMPTY:
1486                 resume_queues(ctx);
1487                 mutex_lock(&ctx->dev->rdev.stats.lock);
1488                 ctx->dev->rdev.stats.db_empty++;
1489                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1490                 break;
1491         case CXGB4_CONTROL_DB_DROP:
1492                 recover_queues(ctx);
1493                 mutex_lock(&ctx->dev->rdev.stats.lock);
1494                 ctx->dev->rdev.stats.db_drop++;
1495                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1496                 break;
1497         default:
1498                 pr_warn("%s: unknown control cmd %u\n",
1499                         pci_name(ctx->lldi.pdev), control);
1500                 break;
1501         }
1502         return 0;
1503 }
1504
1505 static struct cxgb4_uld_info c4iw_uld_info = {
1506         .name = DRV_NAME,
1507         .nrxq = MAX_ULD_QSETS,
1508         .ntxq = MAX_ULD_QSETS,
1509         .rxq_size = 511,
1510         .ciq = true,
1511         .lro = false,
1512         .add = c4iw_uld_add,
1513         .rx_handler = c4iw_uld_rx_handler,
1514         .state_change = c4iw_uld_state_change,
1515         .control = c4iw_uld_control,
1516 };
1517
1518 static int __init c4iw_init_module(void)
1519 {
1520         int err;
1521
1522         err = c4iw_cm_init();
1523         if (err)
1524                 return err;
1525
1526         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1527         if (!c4iw_debugfs_root)
1528                 pr_warn("could not create debugfs entry, continuing\n");
1529
1530         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1531
1532         return 0;
1533 }
1534
1535 static void __exit c4iw_exit_module(void)
1536 {
1537         struct uld_ctx *ctx, *tmp;
1538
1539         mutex_lock(&dev_mutex);
1540         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1541                 if (ctx->dev)
1542                         c4iw_remove(ctx);
1543                 kfree(ctx);
1544         }
1545         mutex_unlock(&dev_mutex);
1546         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1547         c4iw_cm_term();
1548         debugfs_remove_recursive(c4iw_debugfs_root);
1549 }
1550
1551 module_init(c4iw_init_module);
1552 module_exit(c4iw_exit_module);