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