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 %s 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->srq ? "srq" : "rq",
 282                                       qp->srq ? qp->srq->idx : qp->wq.rq.qid,
 283                                       (int)qp->attr.state,
 284                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 285                                       ep->hwtid, (int)ep->com.state,
 286                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 287                                       ntohs(m_lsin->sin_port),
 288                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 289                                       ntohs(m_rsin->sin_port));
 290                 } else {
 291                         struct sockaddr_in6 *lsin6;
 292                         struct sockaddr_in6 *rsin6;
 293                         struct sockaddr_in6 *m_lsin6;
 294                         struct sockaddr_in6 *m_rsin6;
 295
 296                         set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
 297                                           &m_rsin6);
 298                         cc = snprintf(qpd->buf + qpd->pos, space,
 299                                       "rc qp sq id %u rq id %u state %u "
 300                                       "onchip %u ep tid %u state %u "
 301                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 302                                       qp->wq.sq.qid, qp->wq.rq.qid,
 303                                       (int)qp->attr.state,
 304                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 305                                       ep->hwtid, (int)ep->com.state,
 306                                       &lsin6->sin6_addr,
 307                                       ntohs(lsin6->sin6_port),
 308                                       ntohs(m_lsin6->sin6_port),
 309                                       &rsin6->sin6_addr,
 310                                       ntohs(rsin6->sin6_port),
 311                                       ntohs(m_rsin6->sin6_port));
 312                 }
 313         } else
 314                 cc = snprintf(qpd->buf + qpd->pos, space,
 315                              "qp sq id %u rq id %u state %u onchip %u\n",
 316                               qp->wq.sq.qid, qp->wq.rq.qid,
 317                               (int)qp->attr.state,
 318                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 319         if (cc < space)
 320                 qpd->pos += cc;
 321         return 0;
 322 }
 323
 324 static int qp_release(struct inode *inode, struct file *file)
 325 {
 326         struct c4iw_debugfs_data *qpd = file->private_data;
 327         if (!qpd) {
 328                 pr_info("%s null qpd?\n", __func__);
 329                 return 0;
 330         }
 331         vfree(qpd->buf);
 332         kfree(qpd);
 333         return 0;
 334 }
 335
 336 static int qp_open(struct inode *inode, struct file *file)
 337 {
 338         struct c4iw_debugfs_data *qpd;
 339         int count = 1;
 340
 341         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 342         if (!qpd)
 343                 return -ENOMEM;
 344
 345         qpd->devp = inode->i_private;
 346         qpd->pos = 0;
 347
 348         spin_lock_irq(&qpd->devp->lock);
 349         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 350         spin_unlock_irq(&qpd->devp->lock);
 351
 352         qpd->bufsize = count * 180;
 353         qpd->buf = vmalloc(qpd->bufsize);
 354         if (!qpd->buf) {
 355                 kfree(qpd);
 356                 return -ENOMEM;
 357         }
 358
 359         spin_lock_irq(&qpd->devp->lock);
 360         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 361         spin_unlock_irq(&qpd->devp->lock);
 362
 363         qpd->buf[qpd->pos++] = 0;
 364         file->private_data = qpd;
 365         return 0;
 366 }
 367
 368 static const struct file_operations qp_debugfs_fops = {
 369         .owner   = THIS_MODULE,
 370         .open    = qp_open,
 371         .release = qp_release,
 372         .read    = debugfs_read,
 373         .llseek  = default_llseek,
 374 };
 375
 376 static int dump_stag(int id, void *p, void *data)
 377 {
 378         struct c4iw_debugfs_data *stagd = data;
 379         int space;
 380         int cc;
 381         struct fw_ri_tpte tpte;
 382         int ret;
 383
 384         space = stagd->bufsize - stagd->pos - 1;
 385         if (space == 0)
 386                 return 1;
 387
 388         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 389                               (__be32 *)&tpte);
 390         if (ret) {
 391                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 392                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 393                 return ret;
 394         }
 395         cc = snprintf(stagd->buf + stagd->pos, space,
 396                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 397                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 398                       (u32)id<<8,
 399                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 400                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 401                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 402                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 403                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 404                       FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 405                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 406                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 407         if (cc < space)
 408                 stagd->pos += cc;
 409         return 0;
 410 }
 411
 412 static int stag_release(struct inode *inode, struct file *file)
 413 {
 414         struct c4iw_debugfs_data *stagd = file->private_data;
 415         if (!stagd) {
 416                 pr_info("%s null stagd?\n", __func__);
 417                 return 0;
 418         }
 419         vfree(stagd->buf);
 420         kfree(stagd);
 421         return 0;
 422 }
 423
 424 static int stag_open(struct inode *inode, struct file *file)
 425 {
 426         struct c4iw_debugfs_data *stagd;
 427         int ret = 0;
 428         int count = 1;
 429
 430         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 431         if (!stagd) {
 432                 ret = -ENOMEM;
 433                 goto out;
 434         }
 435         stagd->devp = inode->i_private;
 436         stagd->pos = 0;
 437
 438         spin_lock_irq(&stagd->devp->lock);
 439         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 440         spin_unlock_irq(&stagd->devp->lock);
 441
 442         stagd->bufsize = count * 256;
 443         stagd->buf = vmalloc(stagd->bufsize);
 444         if (!stagd->buf) {
 445                 ret = -ENOMEM;
 446                 goto err1;
 447         }
 448
 449         spin_lock_irq(&stagd->devp->lock);
 450         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 451         spin_unlock_irq(&stagd->devp->lock);
 452
 453         stagd->buf[stagd->pos++] = 0;
 454         file->private_data = stagd;
 455         goto out;
 456 err1:
 457         kfree(stagd);
 458 out:
 459         return ret;
 460 }
 461
 462 static const struct file_operations stag_debugfs_fops = {
 463         .owner   = THIS_MODULE,
 464         .open    = stag_open,
 465         .release = stag_release,
 466         .read    = debugfs_read,
 467         .llseek  = default_llseek,
 468 };
 469
 470 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 471
 472 static int stats_show(struct seq_file *seq, void *v)
 473 {
 474         struct c4iw_dev *dev = seq->private;
 475
 476         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 477                    "Max", "Fail");
 478         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 479                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 480                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 481         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 482                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 483                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 484         seq_printf(seq, "     SRQS: %10llu %10llu %10llu %10llu\n",
 485                    dev->rdev.stats.srqt.total, dev->rdev.stats.srqt.cur,
 486                         dev->rdev.stats.srqt.max, dev->rdev.stats.srqt.fail);
 487         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 488                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 489                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 490         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 491                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 492                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 493         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 494                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 495                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 496         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 497                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 498                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 499         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 500         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 501         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 502         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 503                    db_state_str[dev->db_state],
 504                    dev->rdev.stats.db_state_transitions,
 505                    dev->rdev.stats.db_fc_interruptions);
 506         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 507         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 508                    dev->rdev.stats.act_ofld_conn_fails);
 509         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 510                    dev->rdev.stats.pas_ofld_conn_fails);
 511         seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 512         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 513         return 0;
 514 }
 515
 516 static int stats_open(struct inode *inode, struct file *file)
 517 {
 518         return single_open(file, stats_show, inode->i_private);
 519 }
 520
 521 static ssize_t stats_clear(struct file *file, const char __user *buf,
 522                 size_t count, loff_t *pos)
 523 {
 524         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 525
 526         mutex_lock(&dev->rdev.stats.lock);
 527         dev->rdev.stats.pd.max = 0;
 528         dev->rdev.stats.pd.fail = 0;
 529         dev->rdev.stats.qid.max = 0;
 530         dev->rdev.stats.qid.fail = 0;
 531         dev->rdev.stats.stag.max = 0;
 532         dev->rdev.stats.stag.fail = 0;
 533         dev->rdev.stats.pbl.max = 0;
 534         dev->rdev.stats.pbl.fail = 0;
 535         dev->rdev.stats.rqt.max = 0;
 536         dev->rdev.stats.rqt.fail = 0;
 537         dev->rdev.stats.rqt.max = 0;
 538         dev->rdev.stats.rqt.fail = 0;
 539         dev->rdev.stats.ocqp.max = 0;
 540         dev->rdev.stats.ocqp.fail = 0;
 541         dev->rdev.stats.db_full = 0;
 542         dev->rdev.stats.db_empty = 0;
 543         dev->rdev.stats.db_drop = 0;
 544         dev->rdev.stats.db_state_transitions = 0;
 545         dev->rdev.stats.tcam_full = 0;
 546         dev->rdev.stats.act_ofld_conn_fails = 0;
 547         dev->rdev.stats.pas_ofld_conn_fails = 0;
 548         mutex_unlock(&dev->rdev.stats.lock);
 549         return count;
 550 }
 551
 552 static const struct file_operations stats_debugfs_fops = {
 553         .owner   = THIS_MODULE,
 554         .open    = stats_open,
 555         .release = single_release,
 556         .read    = seq_read,
 557         .llseek  = seq_lseek,
 558         .write   = stats_clear,
 559 };
 560
 561 static int dump_ep(int id, void *p, void *data)
 562 {
 563         struct c4iw_ep *ep = p;
 564         struct c4iw_debugfs_data *epd = data;
 565         int space;
 566         int cc;
 567
 568         space = epd->bufsize - epd->pos - 1;
 569         if (space == 0)
 570                 return 1;
 571
 572         if (ep->com.local_addr.ss_family == AF_INET) {
 573                 struct sockaddr_in *lsin;
 574                 struct sockaddr_in *rsin;
 575                 struct sockaddr_in *m_lsin;
 576                 struct sockaddr_in *m_rsin;
 577
 578                 set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 579                 cc = snprintf(epd->buf + epd->pos, space,
 580                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 581                               "history 0x%lx hwtid %d atid %d "
 582                               "conn_na %u abort_na %u "
 583                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 584                               ep, ep->com.cm_id, ep->com.qp,
 585                               (int)ep->com.state, ep->com.flags,
 586                               ep->com.history, ep->hwtid, ep->atid,
 587                               ep->stats.connect_neg_adv,
 588                               ep->stats.abort_neg_adv,
 589                               &lsin->sin_addr, ntohs(lsin->sin_port),
 590                               ntohs(m_lsin->sin_port),
 591                               &rsin->sin_addr, ntohs(rsin->sin_port),
 592                               ntohs(m_rsin->sin_port));
 593         } else {
 594                 struct sockaddr_in6 *lsin6;
 595                 struct sockaddr_in6 *rsin6;
 596                 struct sockaddr_in6 *m_lsin6;
 597                 struct sockaddr_in6 *m_rsin6;
 598
 599                 set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
 600                 cc = snprintf(epd->buf + epd->pos, space,
 601                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 602                               "history 0x%lx hwtid %d atid %d "
 603                               "conn_na %u abort_na %u "
 604                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 605                               ep, ep->com.cm_id, ep->com.qp,
 606                               (int)ep->com.state, ep->com.flags,
 607                               ep->com.history, ep->hwtid, ep->atid,
 608                               ep->stats.connect_neg_adv,
 609                               ep->stats.abort_neg_adv,
 610                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 611                               ntohs(m_lsin6->sin6_port),
 612                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 613                               ntohs(m_rsin6->sin6_port));
 614         }
 615         if (cc < space)
 616                 epd->pos += cc;
 617         return 0;
 618 }
 619
 620 static int dump_listen_ep(int id, void *p, void *data)
 621 {
 622         struct c4iw_listen_ep *ep = p;
 623         struct c4iw_debugfs_data *epd = data;
 624         int space;
 625         int cc;
 626
 627         space = epd->bufsize - epd->pos - 1;
 628         if (space == 0)
 629                 return 1;
 630
 631         if (ep->com.local_addr.ss_family == AF_INET) {
 632                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 633                         &ep->com.cm_id->local_addr;
 634                 struct sockaddr_in *m_lsin = (struct sockaddr_in *)
 635                         &ep->com.cm_id->m_local_addr;
 636
 637                 cc = snprintf(epd->buf + epd->pos, space,
 638                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 639                               "backlog %d %pI4:%d/%d\n",
 640                               ep, ep->com.cm_id, (int)ep->com.state,
 641                               ep->com.flags, ep->stid, ep->backlog,
 642                               &lsin->sin_addr, ntohs(lsin->sin_port),
 643                               ntohs(m_lsin->sin_port));
 644         } else {
 645                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 646                         &ep->com.cm_id->local_addr;
 647                 struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
 648                         &ep->com.cm_id->m_local_addr;
 649
 650                 cc = snprintf(epd->buf + epd->pos, space,
 651                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 652                               "backlog %d %pI6:%d/%d\n",
 653                               ep, ep->com.cm_id, (int)ep->com.state,
 654                               ep->com.flags, ep->stid, ep->backlog,
 655                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 656                               ntohs(m_lsin6->sin6_port));
 657         }
 658         if (cc < space)
 659                 epd->pos += cc;
 660         return 0;
 661 }
 662
 663 static int ep_release(struct inode *inode, struct file *file)
 664 {
 665         struct c4iw_debugfs_data *epd = file->private_data;
 666         if (!epd) {
 667                 pr_info("%s null qpd?\n", __func__);
 668                 return 0;
 669         }
 670         vfree(epd->buf);
 671         kfree(epd);
 672         return 0;
 673 }
 674
 675 static int ep_open(struct inode *inode, struct file *file)
 676 {
 677         struct c4iw_debugfs_data *epd;
 678         int ret = 0;
 679         int count = 1;
 680
 681         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 682         if (!epd) {
 683                 ret = -ENOMEM;
 684                 goto out;
 685         }
 686         epd->devp = inode->i_private;
 687         epd->pos = 0;
 688
 689         spin_lock_irq(&epd->devp->lock);
 690         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 691         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 692         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 693         spin_unlock_irq(&epd->devp->lock);
 694
 695         epd->bufsize = count * 240;
 696         epd->buf = vmalloc(epd->bufsize);
 697         if (!epd->buf) {
 698                 ret = -ENOMEM;
 699                 goto err1;
 700         }
 701
 702         spin_lock_irq(&epd->devp->lock);
 703         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 704         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 705         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 706         spin_unlock_irq(&epd->devp->lock);
 707
 708         file->private_data = epd;
 709         goto out;
 710 err1:
 711         kfree(epd);
 712 out:
 713         return ret;
 714 }
 715
 716 static const struct file_operations ep_debugfs_fops = {
 717         .owner   = THIS_MODULE,
 718         .open    = ep_open,
 719         .release = ep_release,
 720         .read    = debugfs_read,
 721 };
 722
 723 static int setup_debugfs(struct c4iw_dev *devp)
 724 {
 725         if (!devp->debugfs_root)
 726                 return -1;
 727
 728         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 729                                  (void *)devp, &qp_debugfs_fops, 4096);
 730
 731         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 732                                  (void *)devp, &stag_debugfs_fops, 4096);
 733
 734         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 735                                  (void *)devp, &stats_debugfs_fops, 4096);
 736
 737         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 738                                  (void *)devp, &ep_debugfs_fops, 4096);
 739
 740         if (c4iw_wr_log)
 741                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 742                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 743         return 0;
 744 }
 745
 746 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 747                                struct c4iw_dev_ucontext *uctx)
 748 {
 749         struct list_head *pos, *nxt;
 750         struct c4iw_qid_list *entry;
 751
 752         mutex_lock(&uctx->lock);
 753         list_for_each_safe(pos, nxt, &uctx->qpids) {
 754                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 755                 list_del_init(&entry->entry);
 756                 if (!(entry->qid & rdev->qpmask)) {
 757                         c4iw_put_resource(&rdev->resource.qid_table,
 758                                           entry->qid);
 759                         mutex_lock(&rdev->stats.lock);
 760                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 761                         mutex_unlock(&rdev->stats.lock);
 762                 }
 763                 kfree(entry);
 764         }
 765
 766         list_for_each_safe(pos, nxt, &uctx->cqids) {
 767                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 768                 list_del_init(&entry->entry);
 769                 kfree(entry);
 770         }
 771         mutex_unlock(&uctx->lock);
 772 }
 773
 774 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 775                             struct c4iw_dev_ucontext *uctx)
 776 {
 777         INIT_LIST_HEAD(&uctx->qpids);
 778         INIT_LIST_HEAD(&uctx->cqids);
 779         mutex_init(&uctx->lock);
 780 }
 781
 782 /* Caller takes care of locking if needed */
 783 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 784 {
 785         int err;
 786
 787         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 788
 789         /*
 790          * This implementation assumes udb_density == ucq_density!  Eventually
 791          * we might need to support this but for now fail the open. Also the
 792          * cqid and qpid range must match for now.
 793          */
 794         if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 795                 pr_err("%s: unsupported udb/ucq densities %u/%u\n",
 796                        pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 797                        rdev->lldi.ucq_density);
 798                 return -EINVAL;
 799         }
 800         if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 801             rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 802                 pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
 803                        pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 804                        rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 805                        rdev->lldi.vr->cq.size);
 806                 return -EINVAL;
 807         }
 808
 809         rdev->qpmask = rdev->lldi.udb_density - 1;
 810         rdev->cqmask = rdev->lldi.ucq_density - 1;
 811         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 srq size %u\n",
 812                  pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 813                  rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 814                  rdev->lldi.vr->pbl.start,
 815                  rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 816                  rdev->lldi.vr->rq.size,
 817                  rdev->lldi.vr->qp.start,
 818                  rdev->lldi.vr->qp.size,
 819                  rdev->lldi.vr->cq.start,
 820                  rdev->lldi.vr->cq.size,
 821                  rdev->lldi.vr->srq.size);
 822         pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
 823                  &rdev->lldi.pdev->resource[2],
 824                  rdev->lldi.db_reg, rdev->lldi.gts_reg,
 825                  rdev->qpmask, rdev->cqmask);
 826
 827         if (c4iw_num_stags(rdev) == 0)
 828                 return -EINVAL;
 829
 830         rdev->stats.pd.total = T4_MAX_NUM_PD;
 831         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 832         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 833         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 834         rdev->stats.srqt.total = rdev->lldi.vr->srq.size;
 835         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 836         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 837
 838         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev),
 839                                  T4_MAX_NUM_PD, rdev->lldi.vr->srq.size);
 840         if (err) {
 841                 pr_err("error %d initializing resources\n", err);
 842                 return err;
 843         }
 844         err = c4iw_pblpool_create(rdev);
 845         if (err) {
 846                 pr_err("error %d initializing pbl pool\n", err);
 847                 goto destroy_resource;
 848         }
 849         err = c4iw_rqtpool_create(rdev);
 850         if (err) {
 851                 pr_err("error %d initializing rqt pool\n", err);
 852                 goto destroy_pblpool;
 853         }
 854         err = c4iw_ocqp_pool_create(rdev);
 855         if (err) {
 856                 pr_err("error %d initializing ocqp pool\n", err);
 857                 goto destroy_rqtpool;
 858         }
 859         rdev->status_page = (struct t4_dev_status_page *)
 860                             __get_free_page(GFP_KERNEL);
 861         if (!rdev->status_page) {
 862                 err = -ENOMEM;
 863                 goto destroy_ocqp_pool;
 864         }
 865         rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
 866         rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
 867         rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
 868         rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
 869         rdev->status_page->write_cmpl_supported = rdev->lldi.write_cmpl_support;
 870
 871         if (c4iw_wr_log) {
 872                 rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
 873                                        sizeof(*rdev->wr_log),
 874                                        GFP_KERNEL);
 875                 if (rdev->wr_log) {
 876                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 877                         atomic_set(&rdev->wr_log_idx, 0);
 878                 }
 879         }
 880
 881         rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
 882         if (!rdev->free_workq) {
 883                 err = -ENOMEM;
 884                 goto err_free_status_page_and_wr_log;
 885         }
 886
 887         rdev->status_page->db_off = 0;
 888
 889         init_completion(&rdev->rqt_compl);
 890         init_completion(&rdev->pbl_compl);
 891         kref_init(&rdev->rqt_kref);
 892         kref_init(&rdev->pbl_kref);
 893
 894         return 0;
 895 err_free_status_page_and_wr_log:
 896         if (c4iw_wr_log && rdev->wr_log)
 897                 kfree(rdev->wr_log);
 898         free_page((unsigned long)rdev->status_page);
 899 destroy_ocqp_pool:
 900         c4iw_ocqp_pool_destroy(rdev);
 901 destroy_rqtpool:
 902         c4iw_rqtpool_destroy(rdev);
 903 destroy_pblpool:
 904         c4iw_pblpool_destroy(rdev);
 905 destroy_resource:
 906         c4iw_destroy_resource(&rdev->resource);
 907         return err;
 908 }
 909
 910 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 911 {
 912         kfree(rdev->wr_log);
 913         c4iw_release_dev_ucontext(rdev, &rdev->uctx);
 914         free_page((unsigned long)rdev->status_page);
 915         c4iw_pblpool_destroy(rdev);
 916         c4iw_rqtpool_destroy(rdev);
 917         wait_for_completion(&rdev->pbl_compl);
 918         wait_for_completion(&rdev->rqt_compl);
 919         c4iw_ocqp_pool_destroy(rdev);
 920         destroy_workqueue(rdev->free_workq);
 921         c4iw_destroy_resource(&rdev->resource);
 922 }
 923
 924 void c4iw_dealloc(struct uld_ctx *ctx)
 925 {
 926         c4iw_rdev_close(&ctx->dev->rdev);
 927         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->cqidr));
 928         idr_destroy(&ctx->dev->cqidr);
 929         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->qpidr));
 930         idr_destroy(&ctx->dev->qpidr);
 931         WARN_ON_ONCE(!idr_is_empty(&ctx->dev->mmidr));
 932         idr_destroy(&ctx->dev->mmidr);
 933         wait_event(ctx->dev->wait, idr_is_empty(&ctx->dev->hwtid_idr));
 934         idr_destroy(&ctx->dev->hwtid_idr);
 935         idr_destroy(&ctx->dev->stid_idr);
 936         idr_destroy(&ctx->dev->atid_idr);
 937         if (ctx->dev->rdev.bar2_kva)
 938                 iounmap(ctx->dev->rdev.bar2_kva);
 939         if (ctx->dev->rdev.oc_mw_kva)
 940                 iounmap(ctx->dev->rdev.oc_mw_kva);
 941         ib_dealloc_device(&ctx->dev->ibdev);
 942         ctx->dev = NULL;
 943 }
 944
 945 static void c4iw_remove(struct uld_ctx *ctx)
 946 {
 947         pr_debug("c4iw_dev %p\n", ctx->dev);
 948         debugfs_remove_recursive(ctx->dev->debugfs_root);
 949         c4iw_unregister_device(ctx->dev);
 950         c4iw_dealloc(ctx);
 951 }
 952
 953 static int rdma_supported(const struct cxgb4_lld_info *infop)
 954 {
 955         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 956                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 957                infop->vr->cq.size > 0;
 958 }
 959
 960 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 961 {
 962         struct c4iw_dev *devp;
 963         int ret;
 964
 965         if (!rdma_supported(infop)) {
 966                 pr_info("%s: RDMA not supported on this device\n",
 967                         pci_name(infop->pdev));
 968                 return ERR_PTR(-ENOSYS);
 969         }
 970         if (!ocqp_supported(infop))
 971                 pr_info("%s: On-Chip Queues not supported on this device\n",
 972                         pci_name(infop->pdev));
 973
 974         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 975         if (!devp) {
 976                 pr_err("Cannot allocate ib device\n");
 977                 return ERR_PTR(-ENOMEM);
 978         }
 979         devp->rdev.lldi = *infop;
 980
 981         /* init various hw-queue params based on lld info */
 982         pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 983                  devp->rdev.lldi.sge_ingpadboundary,
 984                  devp->rdev.lldi.sge_egrstatuspagesize);
 985
 986         devp->rdev.hw_queue.t4_eq_status_entries =
 987                 devp->rdev.lldi.sge_egrstatuspagesize / 64;
 988         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 989         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 990         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 991                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 992         devp->rdev.hw_queue.t4_max_sq_size =
 993                 devp->rdev.hw_queue.t4_max_eq_size -
 994                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 995         devp->rdev.hw_queue.t4_max_qp_depth =
 996                 devp->rdev.hw_queue.t4_max_rq_size;
 997         devp->rdev.hw_queue.t4_max_cq_depth =
 998                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 999         devp->rdev.hw_queue.t4_stat_len =
1000                 devp->rdev.lldi.sge_egrstatuspagesize;
1001
1002         /*
1003          * For T5/T6 devices, we map all of BAR2 with WC.
1004          * For T4 devices with onchip qp mem, we map only that part
1005          * of BAR2 with WC.
1006          */
1007         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
1008         if (!is_t4(devp->rdev.lldi.adapter_type)) {
1009                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
1010                         pci_resource_len(devp->rdev.lldi.pdev, 2));
1011                 if (!devp->rdev.bar2_kva) {
1012                         pr_err("Unable to ioremap BAR2\n");
1013                         ib_dealloc_device(&devp->ibdev);
1014                         return ERR_PTR(-EINVAL);
1015                 }
1016         } else if (ocqp_supported(infop)) {
1017                 devp->rdev.oc_mw_pa =
1018                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
1019                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
1020                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1021                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1022                         devp->rdev.lldi.vr->ocq.size);
1023                 if (!devp->rdev.oc_mw_kva) {
1024                         pr_err("Unable to ioremap onchip mem\n");
1025                         ib_dealloc_device(&devp->ibdev);
1026                         return ERR_PTR(-EINVAL);
1027                 }
1028         }
1029
1030         pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1031                  devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1032                  devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1033
1034         ret = c4iw_rdev_open(&devp->rdev);
1035         if (ret) {
1036                 pr_err("Unable to open CXIO rdev err %d\n", ret);
1037                 ib_dealloc_device(&devp->ibdev);
1038                 return ERR_PTR(ret);
1039         }
1040
1041         idr_init(&devp->cqidr);
1042         idr_init(&devp->qpidr);
1043         idr_init(&devp->mmidr);
1044         idr_init(&devp->hwtid_idr);
1045         idr_init(&devp->stid_idr);
1046         idr_init(&devp->atid_idr);
1047         spin_lock_init(&devp->lock);
1048         mutex_init(&devp->rdev.stats.lock);
1049         mutex_init(&devp->db_mutex);
1050         INIT_LIST_HEAD(&devp->db_fc_list);
1051         init_waitqueue_head(&devp->wait);
1052         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1053
1054         if (c4iw_debugfs_root) {
1055                 devp->debugfs_root = debugfs_create_dir(
1056                                         pci_name(devp->rdev.lldi.pdev),
1057                                         c4iw_debugfs_root);
1058                 setup_debugfs(devp);
1059         }
1060
1061
1062         return devp;
1063 }
1064
1065 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1066 {
1067         struct uld_ctx *ctx;
1068         static int vers_printed;
1069         int i;
1070
1071         if (!vers_printed++)
1072                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1073                         DRV_VERSION);
1074
1075         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1076         if (!ctx) {
1077                 ctx = ERR_PTR(-ENOMEM);
1078                 goto out;
1079         }
1080         ctx->lldi = *infop;
1081
1082         pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1083                  pci_name(ctx->lldi.pdev),
1084                  ctx->lldi.nchan, ctx->lldi.nrxq,
1085                  ctx->lldi.ntxq, ctx->lldi.nports);
1086
1087         mutex_lock(&dev_mutex);
1088         list_add_tail(&ctx->entry, &uld_ctx_list);
1089         mutex_unlock(&dev_mutex);
1090
1091         for (i = 0; i < ctx->lldi.nrxq; i++)
1092                 pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1093 out:
1094         return ctx;
1095 }
1096
1097 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1098                                                  const __be64 *rsp,
1099                                                  u32 pktshift)
1100 {
1101         struct sk_buff *skb;
1102
1103         /*
1104          * Allocate space for cpl_pass_accept_req which will be synthesized by
1105          * driver. Once the driver synthesizes the request the skb will go
1106          * through the regular cpl_pass_accept_req processing.
1107          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1108          * cpl_rx_pkt.
1109          */
1110         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1111                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1112         if (unlikely(!skb))
1113                 return NULL;
1114
1115         __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1116                   sizeof(struct rss_header) - pktshift);
1117
1118         /*
1119          * This skb will contain:
1120          *   rss_header from the rspq descriptor (1 flit)
1121          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1122          *   space for the difference between the size of an
1123          *      rx_pkt and pass_accept_req cpl (1 flit)
1124          *   the packet data from the gl
1125          */
1126         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1127                                 sizeof(struct rss_header));
1128         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1129                                        sizeof(struct cpl_pass_accept_req),
1130                                        gl->va + pktshift,
1131                                        gl->tot_len - pktshift);
1132         return skb;
1133 }
1134
1135 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1136                            const __be64 *rsp)
1137 {
1138         unsigned int opcode = *(u8 *)rsp;
1139         struct sk_buff *skb;
1140
1141         if (opcode != CPL_RX_PKT)
1142                 goto out;
1143
1144         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1145         if (skb == NULL)
1146                 goto out;
1147
1148         if (c4iw_handlers[opcode] == NULL) {
1149                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1150                 kfree_skb(skb);
1151                 goto out;
1152         }
1153         c4iw_handlers[opcode](dev, skb);
1154         return 1;
1155 out:
1156         return 0;
1157 }
1158
1159 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1160                         const struct pkt_gl *gl)
1161 {
1162         struct uld_ctx *ctx = handle;
1163         struct c4iw_dev *dev = ctx->dev;
1164         struct sk_buff *skb;
1165         u8 opcode;
1166
1167         if (gl == NULL) {
1168                 /* omit RSS and rsp_ctrl at end of descriptor */
1169                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1170
1171                 skb = alloc_skb(256, GFP_ATOMIC);
1172                 if (!skb)
1173                         goto nomem;
1174                 __skb_put(skb, len);
1175                 skb_copy_to_linear_data(skb, &rsp[1], len);
1176         } else if (gl == CXGB4_MSG_AN) {
1177                 const struct rsp_ctrl *rc = (void *)rsp;
1178
1179                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1180                 c4iw_ev_handler(dev, qid);
1181                 return 0;
1182         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1183                 if (recv_rx_pkt(dev, gl, rsp))
1184                         return 0;
1185
1186                 pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1187                         pci_name(ctx->lldi.pdev), gl->va,
1188                         be64_to_cpu(*rsp),
1189                         be64_to_cpu(*(__force __be64 *)gl->va),
1190                         gl->tot_len);
1191
1192                 return 0;
1193         } else {
1194                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1195                 if (unlikely(!skb))
1196                         goto nomem;
1197         }
1198
1199         opcode = *(u8 *)rsp;
1200         if (c4iw_handlers[opcode]) {
1201                 c4iw_handlers[opcode](dev, skb);
1202         } else {
1203                 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1204                 kfree_skb(skb);
1205         }
1206
1207         return 0;
1208 nomem:
1209         return -1;
1210 }
1211
1212 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1213 {
1214         struct uld_ctx *ctx = handle;
1215
1216         pr_debug("new_state %u\n", new_state);
1217         switch (new_state) {
1218         case CXGB4_STATE_UP:
1219                 pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1220                 if (!ctx->dev) {
1221                         ctx->dev = c4iw_alloc(&ctx->lldi);
1222                         if (IS_ERR(ctx->dev)) {
1223                                 pr_err("%s: initialization failed: %ld\n",
1224                                        pci_name(ctx->lldi.pdev),
1225                                        PTR_ERR(ctx->dev));
1226                                 ctx->dev = NULL;
1227                                 break;
1228                         }
1229
1230                         INIT_WORK(&ctx->reg_work, c4iw_register_device);
1231                         queue_work(reg_workq, &ctx->reg_work);
1232                 }
1233                 break;
1234         case CXGB4_STATE_DOWN:
1235                 pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1236                 if (ctx->dev)
1237                         c4iw_remove(ctx);
1238                 break;
1239         case CXGB4_STATE_FATAL_ERROR:
1240         case CXGB4_STATE_START_RECOVERY:
1241                 pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1242                 if (ctx->dev) {
1243                         struct ib_event event;
1244
1245                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1246                         memset(&event, 0, sizeof event);
1247                         event.event  = IB_EVENT_DEVICE_FATAL;
1248                         event.device = &ctx->dev->ibdev;
1249                         ib_dispatch_event(&event);
1250                         c4iw_remove(ctx);
1251                 }
1252                 break;
1253         case CXGB4_STATE_DETACH:
1254                 pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1255                 if (ctx->dev)
1256                         c4iw_remove(ctx);
1257                 break;
1258         }
1259         return 0;
1260 }
1261
1262 static int disable_qp_db(int id, void *p, void *data)
1263 {
1264         struct c4iw_qp *qp = p;
1265
1266         t4_disable_wq_db(&qp->wq);
1267         return 0;
1268 }
1269
1270 static void stop_queues(struct uld_ctx *ctx)
1271 {
1272         unsigned long flags;
1273
1274         spin_lock_irqsave(&ctx->dev->lock, flags);
1275         ctx->dev->rdev.stats.db_state_transitions++;
1276         ctx->dev->db_state = STOPPED;
1277         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1278                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1279         else
1280                 ctx->dev->rdev.status_page->db_off = 1;
1281         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1282 }
1283
1284 static int enable_qp_db(int id, void *p, void *data)
1285 {
1286         struct c4iw_qp *qp = p;
1287
1288         t4_enable_wq_db(&qp->wq);
1289         return 0;
1290 }
1291
1292 static void resume_rc_qp(struct c4iw_qp *qp)
1293 {
1294         spin_lock(&qp->lock);
1295         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1296         qp->wq.sq.wq_pidx_inc = 0;
1297         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1298         qp->wq.rq.wq_pidx_inc = 0;
1299         spin_unlock(&qp->lock);
1300 }
1301
1302 static void resume_a_chunk(struct uld_ctx *ctx)
1303 {
1304         int i;
1305         struct c4iw_qp *qp;
1306
1307         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1308                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1309                                       db_fc_entry);
1310                 list_del_init(&qp->db_fc_entry);
1311                 resume_rc_qp(qp);
1312                 if (list_empty(&ctx->dev->db_fc_list))
1313                         break;
1314         }
1315 }
1316
1317 static void resume_queues(struct uld_ctx *ctx)
1318 {
1319         spin_lock_irq(&ctx->dev->lock);
1320         if (ctx->dev->db_state != STOPPED)
1321                 goto out;
1322         ctx->dev->db_state = FLOW_CONTROL;
1323         while (1) {
1324                 if (list_empty(&ctx->dev->db_fc_list)) {
1325                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1326                         ctx->dev->db_state = NORMAL;
1327                         ctx->dev->rdev.stats.db_state_transitions++;
1328                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1329                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1330                                              NULL);
1331                         } else {
1332                                 ctx->dev->rdev.status_page->db_off = 0;
1333                         }
1334                         break;
1335                 } else {
1336                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1337                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1338                                DB_FC_DRAIN_THRESH)) {
1339                                 resume_a_chunk(ctx);
1340                         }
1341                         if (!list_empty(&ctx->dev->db_fc_list)) {
1342                                 spin_unlock_irq(&ctx->dev->lock);
1343                                 if (DB_FC_RESUME_DELAY) {
1344                                         set_current_state(TASK_UNINTERRUPTIBLE);
1345                                         schedule_timeout(DB_FC_RESUME_DELAY);
1346                                 }
1347                                 spin_lock_irq(&ctx->dev->lock);
1348                                 if (ctx->dev->db_state != FLOW_CONTROL)
1349                                         break;
1350                         }
1351                 }
1352         }
1353 out:
1354         if (ctx->dev->db_state != NORMAL)
1355                 ctx->dev->rdev.stats.db_fc_interruptions++;
1356         spin_unlock_irq(&ctx->dev->lock);
1357 }
1358
1359 struct qp_list {
1360         unsigned idx;
1361         struct c4iw_qp **qps;
1362 };
1363
1364 static int add_and_ref_qp(int id, void *p, void *data)
1365 {
1366         struct qp_list *qp_listp = data;
1367         struct c4iw_qp *qp = p;
1368
1369         c4iw_qp_add_ref(&qp->ibqp);
1370         qp_listp->qps[qp_listp->idx++] = qp;
1371         return 0;
1372 }
1373
1374 static int count_qps(int id, void *p, void *data)
1375 {
1376         unsigned *countp = data;
1377         (*countp)++;
1378         return 0;
1379 }
1380
1381 static void deref_qps(struct qp_list *qp_list)
1382 {
1383         int idx;
1384
1385         for (idx = 0; idx < qp_list->idx; idx++)
1386                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1387 }
1388
1389 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1390 {
1391         int idx;
1392         int ret;
1393
1394         for (idx = 0; idx < qp_list->idx; idx++) {
1395                 struct c4iw_qp *qp = qp_list->qps[idx];
1396
1397                 spin_lock_irq(&qp->rhp->lock);
1398                 spin_lock(&qp->lock);
1399                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1400                                           qp->wq.sq.qid,
1401                                           t4_sq_host_wq_pidx(&qp->wq),
1402                                           t4_sq_wq_size(&qp->wq));
1403                 if (ret) {
1404                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1405                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1406                         spin_unlock(&qp->lock);
1407                         spin_unlock_irq(&qp->rhp->lock);
1408                         return;
1409                 }
1410                 qp->wq.sq.wq_pidx_inc = 0;
1411
1412                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1413                                           qp->wq.rq.qid,
1414                                           t4_rq_host_wq_pidx(&qp->wq),
1415                                           t4_rq_wq_size(&qp->wq));
1416
1417                 if (ret) {
1418                         pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1419                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1420                         spin_unlock(&qp->lock);
1421                         spin_unlock_irq(&qp->rhp->lock);
1422                         return;
1423                 }
1424                 qp->wq.rq.wq_pidx_inc = 0;
1425                 spin_unlock(&qp->lock);
1426                 spin_unlock_irq(&qp->rhp->lock);
1427
1428                 /* Wait for the dbfifo to drain */
1429                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1430                         set_current_state(TASK_UNINTERRUPTIBLE);
1431                         schedule_timeout(usecs_to_jiffies(10));
1432                 }
1433         }
1434 }
1435
1436 static void recover_queues(struct uld_ctx *ctx)
1437 {
1438         int count = 0;
1439         struct qp_list qp_list;
1440         int ret;
1441
1442         /* slow everybody down */
1443         set_current_state(TASK_UNINTERRUPTIBLE);
1444         schedule_timeout(usecs_to_jiffies(1000));
1445
1446         /* flush the SGE contexts */
1447         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1448         if (ret) {
1449                 pr_err("%s: Fatal error - DB overflow recovery failed\n",
1450                        pci_name(ctx->lldi.pdev));
1451                 return;
1452         }
1453
1454         /* Count active queues so we can build a list of queues to recover */
1455         spin_lock_irq(&ctx->dev->lock);
1456         WARN_ON(ctx->dev->db_state != STOPPED);
1457         ctx->dev->db_state = RECOVERY;
1458         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1459
1460         qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
1461         if (!qp_list.qps) {
1462                 spin_unlock_irq(&ctx->dev->lock);
1463                 return;
1464         }
1465         qp_list.idx = 0;
1466
1467         /* add and ref each qp so it doesn't get freed */
1468         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1469
1470         spin_unlock_irq(&ctx->dev->lock);
1471
1472         /* now traverse the list in a safe context to recover the db state*/
1473         recover_lost_dbs(ctx, &qp_list);
1474
1475         /* we're almost done!  deref the qps and clean up */
1476         deref_qps(&qp_list);
1477         kfree(qp_list.qps);
1478
1479         spin_lock_irq(&ctx->dev->lock);
1480         WARN_ON(ctx->dev->db_state != RECOVERY);
1481         ctx->dev->db_state = STOPPED;
1482         spin_unlock_irq(&ctx->dev->lock);
1483 }
1484
1485 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1486 {
1487         struct uld_ctx *ctx = handle;
1488
1489         switch (control) {
1490         case CXGB4_CONTROL_DB_FULL:
1491                 stop_queues(ctx);
1492                 ctx->dev->rdev.stats.db_full++;
1493                 break;
1494         case CXGB4_CONTROL_DB_EMPTY:
1495                 resume_queues(ctx);
1496                 mutex_lock(&ctx->dev->rdev.stats.lock);
1497                 ctx->dev->rdev.stats.db_empty++;
1498                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1499                 break;
1500         case CXGB4_CONTROL_DB_DROP:
1501                 recover_queues(ctx);
1502                 mutex_lock(&ctx->dev->rdev.stats.lock);
1503                 ctx->dev->rdev.stats.db_drop++;
1504                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1505                 break;
1506         default:
1507                 pr_warn("%s: unknown control cmd %u\n",
1508                         pci_name(ctx->lldi.pdev), control);
1509                 break;
1510         }
1511         return 0;
1512 }
1513
1514 static struct cxgb4_uld_info c4iw_uld_info = {
1515         .name = DRV_NAME,
1516         .nrxq = MAX_ULD_QSETS,
1517         .ntxq = MAX_ULD_QSETS,
1518         .rxq_size = 511,
1519         .ciq = true,
1520         .lro = false,
1521         .add = c4iw_uld_add,
1522         .rx_handler = c4iw_uld_rx_handler,
1523         .state_change = c4iw_uld_state_change,
1524         .control = c4iw_uld_control,
1525 };
1526
1527 void _c4iw_free_wr_wait(struct kref *kref)
1528 {
1529         struct c4iw_wr_wait *wr_waitp;
1530
1531         wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1532         pr_debug("Free wr_wait %p\n", wr_waitp);
1533         kfree(wr_waitp);
1534 }
1535
1536 struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1537 {
1538         struct c4iw_wr_wait *wr_waitp;
1539
1540         wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1541         if (wr_waitp) {
1542                 kref_init(&wr_waitp->kref);
1543                 pr_debug("wr_wait %p\n", wr_waitp);
1544         }
1545         return wr_waitp;
1546 }
1547
1548 static int __init c4iw_init_module(void)
1549 {
1550         int err;
1551
1552         err = c4iw_cm_init();
1553         if (err)
1554                 return err;
1555
1556         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1557         if (!c4iw_debugfs_root)
1558                 pr_warn("could not create debugfs entry, continuing\n");
1559
1560         reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1561         if (!reg_workq) {
1562                 pr_err("Failed creating workqueue to register iwarp device\n");
1563                 return -ENOMEM;
1564         }
1565
1566         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1567
1568         return 0;
1569 }
1570
1571 static void __exit c4iw_exit_module(void)
1572 {
1573         struct uld_ctx *ctx, *tmp;
1574
1575         mutex_lock(&dev_mutex);
1576         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1577                 if (ctx->dev)
1578                         c4iw_remove(ctx);
1579                 kfree(ctx);
1580         }
1581         mutex_unlock(&dev_mutex);
1582         flush_workqueue(reg_workq);
1583         destroy_workqueue(reg_workq);
1584         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1585         c4iw_cm_term();
1586         debugfs_remove_recursive(c4iw_debugfs_root);
1587 }
1588
1589 module_init(c4iw_init_module);
1590 module_exit(c4iw_exit_module);