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