kernel/drivers/infiniband/hw/cxgb4/device.c

   1 /*
   2  * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/debugfs.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/math64.h>
  37
  38 #include <rdma/ib_verbs.h>
  39
  40 #include "iw_cxgb4.h"
  41
  42 #define DRV_VERSION "0.1"
  43
  44 MODULE_AUTHOR("Steve Wise");
  45 MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
  46 MODULE_LICENSE("Dual BSD/GPL");
  47 MODULE_VERSION(DRV_VERSION);
  48
  49 static int allow_db_fc_on_t5;
  50 module_param(allow_db_fc_on_t5, int, 0644);
  51 MODULE_PARM_DESC(allow_db_fc_on_t5,
  52                  "Allow DB Flow Control on T5 (default = 0)");
  53
  54 static int allow_db_coalescing_on_t5;
  55 module_param(allow_db_coalescing_on_t5, int, 0644);
  56 MODULE_PARM_DESC(allow_db_coalescing_on_t5,
  57                  "Allow DB Coalescing on T5 (default = 0)");
  58
  59 int c4iw_wr_log = 0;
  60 module_param(c4iw_wr_log, int, 0444);
  61 MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
  62
  63 static int c4iw_wr_log_size_order = 12;
  64 module_param(c4iw_wr_log_size_order, int, 0444);
  65 MODULE_PARM_DESC(c4iw_wr_log_size_order,
  66                  "Number of entries (log2) in the work request timing log.");
  67
  68 struct uld_ctx {
  69         struct list_head entry;
  70         struct cxgb4_lld_info lldi;
  71         struct c4iw_dev *dev;
  72 };
  73
  74 static LIST_HEAD(uld_ctx_list);
  75 static DEFINE_MUTEX(dev_mutex);
  76
  77 #define DB_FC_RESUME_SIZE 64
  78 #define DB_FC_RESUME_DELAY 1
  79 #define DB_FC_DRAIN_THRESH 0
  80
  81 static struct dentry *c4iw_debugfs_root;
  82
  83 struct c4iw_debugfs_data {
  84         struct c4iw_dev *devp;
  85         char *buf;
  86         int bufsize;
  87         int pos;
  88 };
  89
  90 /* registered cxgb4 netlink callbacks */
  91 static struct ibnl_client_cbs c4iw_nl_cb_table[] = {
  92         [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
  93         [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
  94         [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
  95         [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
  96         [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb},
  97         [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
  98         [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
  99 };
 100
 101 static int count_idrs(int id, void *p, void *data)
 102 {
 103         int *countp = data;
 104
 105         *countp = *countp + 1;
 106         return 0;
 107 }
 108
 109 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
 110                             loff_t *ppos)
 111 {
 112         struct c4iw_debugfs_data *d = file->private_data;
 113
 114         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
 115 }
 116
 117 void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
 118 {
 119         struct wr_log_entry le;
 120         int idx;
 121
 122         if (!wq->rdev->wr_log)
 123                 return;
 124
 125         idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
 126                 (wq->rdev->wr_log_size - 1);
 127         le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
 128         getnstimeofday(&le.poll_host_ts);
 129         le.valid = 1;
 130         le.cqe_sge_ts = CQE_TS(cqe);
 131         if (SQ_TYPE(cqe)) {
 132                 le.qid = wq->sq.qid;
 133                 le.opcode = CQE_OPCODE(cqe);
 134                 le.post_host_ts = wq->sq.sw_sq[wq->sq.cidx].host_ts;
 135                 le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
 136                 le.wr_id = CQE_WRID_SQ_IDX(cqe);
 137         } else {
 138                 le.qid = wq->rq.qid;
 139                 le.opcode = FW_RI_RECEIVE;
 140                 le.post_host_ts = wq->rq.sw_rq[wq->rq.cidx].host_ts;
 141                 le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
 142                 le.wr_id = CQE_WRID_MSN(cqe);
 143         }
 144         wq->rdev->wr_log[idx] = le;
 145 }
 146
 147 static int wr_log_show(struct seq_file *seq, void *v)
 148 {
 149         struct c4iw_dev *dev = seq->private;
 150         struct timespec prev_ts = {0, 0};
 151         struct wr_log_entry *lep;
 152         int prev_ts_set = 0;
 153         int idx, end;
 154
 155 #define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
 156
 157         idx = atomic_read(&dev->rdev.wr_log_idx) &
 158                 (dev->rdev.wr_log_size - 1);
 159         end = idx - 1;
 160         if (end < 0)
 161                 end = dev->rdev.wr_log_size - 1;
 162         lep = &dev->rdev.wr_log[idx];
 163         while (idx != end) {
 164                 if (lep->valid) {
 165                         if (!prev_ts_set) {
 166                                 prev_ts_set = 1;
 167                                 prev_ts = lep->poll_host_ts;
 168                         }
 169                         seq_printf(seq, "%04u: sec %lu nsec %lu qid %u opcode "
 170                                    "%u %s 0x%x host_wr_delta sec %lu nsec %lu "
 171                                    "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
 172                                    "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
 173                                    "cqe_poll_delta_ns %llu\n",
 174                                    idx,
 175                                    timespec_sub(lep->poll_host_ts,
 176                                                 prev_ts).tv_sec,
 177                                    timespec_sub(lep->poll_host_ts,
 178                                                 prev_ts).tv_nsec,
 179                                    lep->qid, lep->opcode,
 180                                    lep->opcode == FW_RI_RECEIVE ?
 181                                                         "msn" : "wrid",
 182                                    lep->wr_id,
 183                                    timespec_sub(lep->poll_host_ts,
 184                                                 lep->post_host_ts).tv_sec,
 185                                    timespec_sub(lep->poll_host_ts,
 186                                                 lep->post_host_ts).tv_nsec,
 187                                    lep->post_sge_ts, lep->cqe_sge_ts,
 188                                    lep->poll_sge_ts,
 189                                    ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
 190                                    ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
 191                         prev_ts = lep->poll_host_ts;
 192                 }
 193                 idx++;
 194                 if (idx > (dev->rdev.wr_log_size - 1))
 195                         idx = 0;
 196                 lep = &dev->rdev.wr_log[idx];
 197         }
 198 #undef ts2ns
 199         return 0;
 200 }
 201
 202 static int wr_log_open(struct inode *inode, struct file *file)
 203 {
 204         return single_open(file, wr_log_show, inode->i_private);
 205 }
 206
 207 static ssize_t wr_log_clear(struct file *file, const char __user *buf,
 208                             size_t count, loff_t *pos)
 209 {
 210         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 211         int i;
 212
 213         if (dev->rdev.wr_log)
 214                 for (i = 0; i < dev->rdev.wr_log_size; i++)
 215                         dev->rdev.wr_log[i].valid = 0;
 216         return count;
 217 }
 218
 219 static const struct file_operations wr_log_debugfs_fops = {
 220         .owner   = THIS_MODULE,
 221         .open    = wr_log_open,
 222         .release = single_release,
 223         .read    = seq_read,
 224         .llseek  = seq_lseek,
 225         .write   = wr_log_clear,
 226 };
 227
 228 static int dump_qp(int id, void *p, void *data)
 229 {
 230         struct c4iw_qp *qp = p;
 231         struct c4iw_debugfs_data *qpd = data;
 232         int space;
 233         int cc;
 234
 235         if (id != qp->wq.sq.qid)
 236                 return 0;
 237
 238         space = qpd->bufsize - qpd->pos - 1;
 239         if (space == 0)
 240                 return 1;
 241
 242         if (qp->ep) {
 243                 if (qp->ep->com.local_addr.ss_family == AF_INET) {
 244                         struct sockaddr_in *lsin = (struct sockaddr_in *)
 245                                 &qp->ep->com.local_addr;
 246                         struct sockaddr_in *rsin = (struct sockaddr_in *)
 247                                 &qp->ep->com.remote_addr;
 248                         struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 249                                 &qp->ep->com.mapped_local_addr;
 250                         struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 251                                 &qp->ep->com.mapped_remote_addr;
 252
 253                         cc = snprintf(qpd->buf + qpd->pos, space,
 254                                       "rc qp sq id %u rq id %u state %u "
 255                                       "onchip %u ep tid %u state %u "
 256                                       "%pI4:%u/%u->%pI4:%u/%u\n",
 257                                       qp->wq.sq.qid, qp->wq.rq.qid,
 258                                       (int)qp->attr.state,
 259                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 260                                       qp->ep->hwtid, (int)qp->ep->com.state,
 261                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 262                                       ntohs(mapped_lsin->sin_port),
 263                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 264                                       ntohs(mapped_rsin->sin_port));
 265                 } else {
 266                         struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 267                                 &qp->ep->com.local_addr;
 268                         struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 269                                 &qp->ep->com.remote_addr;
 270                         struct sockaddr_in6 *mapped_lsin6 =
 271                                 (struct sockaddr_in6 *)
 272                                 &qp->ep->com.mapped_local_addr;
 273                         struct sockaddr_in6 *mapped_rsin6 =
 274                                 (struct sockaddr_in6 *)
 275                                 &qp->ep->com.mapped_remote_addr;
 276
 277                         cc = snprintf(qpd->buf + qpd->pos, space,
 278                                       "rc qp sq id %u rq id %u state %u "
 279                                       "onchip %u ep tid %u state %u "
 280                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 281                                       qp->wq.sq.qid, qp->wq.rq.qid,
 282                                       (int)qp->attr.state,
 283                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 284                                       qp->ep->hwtid, (int)qp->ep->com.state,
 285                                       &lsin6->sin6_addr,
 286                                       ntohs(lsin6->sin6_port),
 287                                       ntohs(mapped_lsin6->sin6_port),
 288                                       &rsin6->sin6_addr,
 289                                       ntohs(rsin6->sin6_port),
 290                                       ntohs(mapped_rsin6->sin6_port));
 291                 }
 292         } else
 293                 cc = snprintf(qpd->buf + qpd->pos, space,
 294                              "qp sq id %u rq id %u state %u onchip %u\n",
 295                               qp->wq.sq.qid, qp->wq.rq.qid,
 296                               (int)qp->attr.state,
 297                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 298         if (cc < space)
 299                 qpd->pos += cc;
 300         return 0;
 301 }
 302
 303 static int qp_release(struct inode *inode, struct file *file)
 304 {
 305         struct c4iw_debugfs_data *qpd = file->private_data;
 306         if (!qpd) {
 307                 printk(KERN_INFO "%s null qpd?\n", __func__);
 308                 return 0;
 309         }
 310         vfree(qpd->buf);
 311         kfree(qpd);
 312         return 0;
 313 }
 314
 315 static int qp_open(struct inode *inode, struct file *file)
 316 {
 317         struct c4iw_debugfs_data *qpd;
 318         int ret = 0;
 319         int count = 1;
 320
 321         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 322         if (!qpd) {
 323                 ret = -ENOMEM;
 324                 goto out;
 325         }
 326         qpd->devp = inode->i_private;
 327         qpd->pos = 0;
 328
 329         spin_lock_irq(&qpd->devp->lock);
 330         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 331         spin_unlock_irq(&qpd->devp->lock);
 332
 333         qpd->bufsize = count * 128;
 334         qpd->buf = vmalloc(qpd->bufsize);
 335         if (!qpd->buf) {
 336                 ret = -ENOMEM;
 337                 goto err1;
 338         }
 339
 340         spin_lock_irq(&qpd->devp->lock);
 341         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 342         spin_unlock_irq(&qpd->devp->lock);
 343
 344         qpd->buf[qpd->pos++] = 0;
 345         file->private_data = qpd;
 346         goto out;
 347 err1:
 348         kfree(qpd);
 349 out:
 350         return ret;
 351 }
 352
 353 static const struct file_operations qp_debugfs_fops = {
 354         .owner   = THIS_MODULE,
 355         .open    = qp_open,
 356         .release = qp_release,
 357         .read    = debugfs_read,
 358         .llseek  = default_llseek,
 359 };
 360
 361 static int dump_stag(int id, void *p, void *data)
 362 {
 363         struct c4iw_debugfs_data *stagd = data;
 364         int space;
 365         int cc;
 366         struct fw_ri_tpte tpte;
 367         int ret;
 368
 369         space = stagd->bufsize - stagd->pos - 1;
 370         if (space == 0)
 371                 return 1;
 372
 373         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 374                               (__be32 *)&tpte);
 375         if (ret) {
 376                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 377                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 378                 return ret;
 379         }
 380         cc = snprintf(stagd->buf + stagd->pos, space,
 381                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 382                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 383                       (u32)id<<8,
 384                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 385                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 386                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 387                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 388                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 389                       FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 390                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 391                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 392         if (cc < space)
 393                 stagd->pos += cc;
 394         return 0;
 395 }
 396
 397 static int stag_release(struct inode *inode, struct file *file)
 398 {
 399         struct c4iw_debugfs_data *stagd = file->private_data;
 400         if (!stagd) {
 401                 printk(KERN_INFO "%s null stagd?\n", __func__);
 402                 return 0;
 403         }
 404         vfree(stagd->buf);
 405         kfree(stagd);
 406         return 0;
 407 }
 408
 409 static int stag_open(struct inode *inode, struct file *file)
 410 {
 411         struct c4iw_debugfs_data *stagd;
 412         int ret = 0;
 413         int count = 1;
 414
 415         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 416         if (!stagd) {
 417                 ret = -ENOMEM;
 418                 goto out;
 419         }
 420         stagd->devp = inode->i_private;
 421         stagd->pos = 0;
 422
 423         spin_lock_irq(&stagd->devp->lock);
 424         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 425         spin_unlock_irq(&stagd->devp->lock);
 426
 427         stagd->bufsize = count * 256;
 428         stagd->buf = vmalloc(stagd->bufsize);
 429         if (!stagd->buf) {
 430                 ret = -ENOMEM;
 431                 goto err1;
 432         }
 433
 434         spin_lock_irq(&stagd->devp->lock);
 435         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 436         spin_unlock_irq(&stagd->devp->lock);
 437
 438         stagd->buf[stagd->pos++] = 0;
 439         file->private_data = stagd;
 440         goto out;
 441 err1:
 442         kfree(stagd);
 443 out:
 444         return ret;
 445 }
 446
 447 static const struct file_operations stag_debugfs_fops = {
 448         .owner   = THIS_MODULE,
 449         .open    = stag_open,
 450         .release = stag_release,
 451         .read    = debugfs_read,
 452         .llseek  = default_llseek,
 453 };
 454
 455 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 456
 457 static int stats_show(struct seq_file *seq, void *v)
 458 {
 459         struct c4iw_dev *dev = seq->private;
 460
 461         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 462                    "Max", "Fail");
 463         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 464                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 465                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 466         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 467                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 468                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 469         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 470                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 471                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 472         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 473                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 474                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 475         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 476                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 477                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 478         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 479                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 480                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 481         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 482         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 483         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 484         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 485                    db_state_str[dev->db_state],
 486                    dev->rdev.stats.db_state_transitions,
 487                    dev->rdev.stats.db_fc_interruptions);
 488         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 489         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 490                    dev->rdev.stats.act_ofld_conn_fails);
 491         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 492                    dev->rdev.stats.pas_ofld_conn_fails);
 493         seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 494         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 495         return 0;
 496 }
 497
 498 static int stats_open(struct inode *inode, struct file *file)
 499 {
 500         return single_open(file, stats_show, inode->i_private);
 501 }
 502
 503 static ssize_t stats_clear(struct file *file, const char __user *buf,
 504                 size_t count, loff_t *pos)
 505 {
 506         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 507
 508         mutex_lock(&dev->rdev.stats.lock);
 509         dev->rdev.stats.pd.max = 0;
 510         dev->rdev.stats.pd.fail = 0;
 511         dev->rdev.stats.qid.max = 0;
 512         dev->rdev.stats.qid.fail = 0;
 513         dev->rdev.stats.stag.max = 0;
 514         dev->rdev.stats.stag.fail = 0;
 515         dev->rdev.stats.pbl.max = 0;
 516         dev->rdev.stats.pbl.fail = 0;
 517         dev->rdev.stats.rqt.max = 0;
 518         dev->rdev.stats.rqt.fail = 0;
 519         dev->rdev.stats.ocqp.max = 0;
 520         dev->rdev.stats.ocqp.fail = 0;
 521         dev->rdev.stats.db_full = 0;
 522         dev->rdev.stats.db_empty = 0;
 523         dev->rdev.stats.db_drop = 0;
 524         dev->rdev.stats.db_state_transitions = 0;
 525         dev->rdev.stats.tcam_full = 0;
 526         dev->rdev.stats.act_ofld_conn_fails = 0;
 527         dev->rdev.stats.pas_ofld_conn_fails = 0;
 528         mutex_unlock(&dev->rdev.stats.lock);
 529         return count;
 530 }
 531
 532 static const struct file_operations stats_debugfs_fops = {
 533         .owner   = THIS_MODULE,
 534         .open    = stats_open,
 535         .release = single_release,
 536         .read    = seq_read,
 537         .llseek  = seq_lseek,
 538         .write   = stats_clear,
 539 };
 540
 541 static int dump_ep(int id, void *p, void *data)
 542 {
 543         struct c4iw_ep *ep = p;
 544         struct c4iw_debugfs_data *epd = data;
 545         int space;
 546         int cc;
 547
 548         space = epd->bufsize - epd->pos - 1;
 549         if (space == 0)
 550                 return 1;
 551
 552         if (ep->com.local_addr.ss_family == AF_INET) {
 553                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 554                         &ep->com.local_addr;
 555                 struct sockaddr_in *rsin = (struct sockaddr_in *)
 556                         &ep->com.remote_addr;
 557                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 558                         &ep->com.mapped_local_addr;
 559                 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 560                         &ep->com.mapped_remote_addr;
 561
 562                 cc = snprintf(epd->buf + epd->pos, space,
 563                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 564                               "history 0x%lx hwtid %d atid %d "
 565                               "conn_na %u abort_na %u "
 566                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 567                               ep, ep->com.cm_id, ep->com.qp,
 568                               (int)ep->com.state, ep->com.flags,
 569                               ep->com.history, ep->hwtid, ep->atid,
 570                               ep->stats.connect_neg_adv,
 571                               ep->stats.abort_neg_adv,
 572                               &lsin->sin_addr, ntohs(lsin->sin_port),
 573                               ntohs(mapped_lsin->sin_port),
 574                               &rsin->sin_addr, ntohs(rsin->sin_port),
 575                               ntohs(mapped_rsin->sin_port));
 576         } else {
 577                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 578                         &ep->com.local_addr;
 579                 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 580                         &ep->com.remote_addr;
 581                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 582                         &ep->com.mapped_local_addr;
 583                 struct sockaddr_in6 *mapped_rsin6 = (struct sockaddr_in6 *)
 584                         &ep->com.mapped_remote_addr;
 585
 586                 cc = snprintf(epd->buf + epd->pos, space,
 587                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 588                               "history 0x%lx hwtid %d atid %d "
 589                               "conn_na %u abort_na %u "
 590                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 591                               ep, ep->com.cm_id, ep->com.qp,
 592                               (int)ep->com.state, ep->com.flags,
 593                               ep->com.history, ep->hwtid, ep->atid,
 594                               ep->stats.connect_neg_adv,
 595                               ep->stats.abort_neg_adv,
 596                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 597                               ntohs(mapped_lsin6->sin6_port),
 598                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 599                               ntohs(mapped_rsin6->sin6_port));
 600         }
 601         if (cc < space)
 602                 epd->pos += cc;
 603         return 0;
 604 }
 605
 606 static int dump_listen_ep(int id, void *p, void *data)
 607 {
 608         struct c4iw_listen_ep *ep = p;
 609         struct c4iw_debugfs_data *epd = data;
 610         int space;
 611         int cc;
 612
 613         space = epd->bufsize - epd->pos - 1;
 614         if (space == 0)
 615                 return 1;
 616
 617         if (ep->com.local_addr.ss_family == AF_INET) {
 618                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 619                         &ep->com.local_addr;
 620                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 621                         &ep->com.mapped_local_addr;
 622
 623                 cc = snprintf(epd->buf + epd->pos, space,
 624                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 625                               "backlog %d %pI4:%d/%d\n",
 626                               ep, ep->com.cm_id, (int)ep->com.state,
 627                               ep->com.flags, ep->stid, ep->backlog,
 628                               &lsin->sin_addr, ntohs(lsin->sin_port),
 629                               ntohs(mapped_lsin->sin_port));
 630         } else {
 631                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 632                         &ep->com.local_addr;
 633                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 634                         &ep->com.mapped_local_addr;
 635
 636                 cc = snprintf(epd->buf + epd->pos, space,
 637                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 638                               "backlog %d %pI6:%d/%d\n",
 639                               ep, ep->com.cm_id, (int)ep->com.state,
 640                               ep->com.flags, ep->stid, ep->backlog,
 641                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 642                               ntohs(mapped_lsin6->sin6_port));
 643         }
 644         if (cc < space)
 645                 epd->pos += cc;
 646         return 0;
 647 }
 648
 649 static int ep_release(struct inode *inode, struct file *file)
 650 {
 651         struct c4iw_debugfs_data *epd = file->private_data;
 652         if (!epd) {
 653                 pr_info("%s null qpd?\n", __func__);
 654                 return 0;
 655         }
 656         vfree(epd->buf);
 657         kfree(epd);
 658         return 0;
 659 }
 660
 661 static int ep_open(struct inode *inode, struct file *file)
 662 {
 663         struct c4iw_debugfs_data *epd;
 664         int ret = 0;
 665         int count = 1;
 666
 667         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 668         if (!epd) {
 669                 ret = -ENOMEM;
 670                 goto out;
 671         }
 672         epd->devp = inode->i_private;
 673         epd->pos = 0;
 674
 675         spin_lock_irq(&epd->devp->lock);
 676         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 677         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 678         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 679         spin_unlock_irq(&epd->devp->lock);
 680
 681         epd->bufsize = count * 240;
 682         epd->buf = vmalloc(epd->bufsize);
 683         if (!epd->buf) {
 684                 ret = -ENOMEM;
 685                 goto err1;
 686         }
 687
 688         spin_lock_irq(&epd->devp->lock);
 689         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 690         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 691         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 692         spin_unlock_irq(&epd->devp->lock);
 693
 694         file->private_data = epd;
 695         goto out;
 696 err1:
 697         kfree(epd);
 698 out:
 699         return ret;
 700 }
 701
 702 static const struct file_operations ep_debugfs_fops = {
 703         .owner   = THIS_MODULE,
 704         .open    = ep_open,
 705         .release = ep_release,
 706         .read    = debugfs_read,
 707 };
 708
 709 static int setup_debugfs(struct c4iw_dev *devp)
 710 {
 711         if (!devp->debugfs_root)
 712                 return -1;
 713
 714         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 715                                  (void *)devp, &qp_debugfs_fops, 4096);
 716
 717         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 718                                  (void *)devp, &stag_debugfs_fops, 4096);
 719
 720         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 721                                  (void *)devp, &stats_debugfs_fops, 4096);
 722
 723         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 724                                  (void *)devp, &ep_debugfs_fops, 4096);
 725
 726         if (c4iw_wr_log)
 727                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 728                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 729         return 0;
 730 }
 731
 732 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 733                                struct c4iw_dev_ucontext *uctx)
 734 {
 735         struct list_head *pos, *nxt;
 736         struct c4iw_qid_list *entry;
 737
 738         mutex_lock(&uctx->lock);
 739         list_for_each_safe(pos, nxt, &uctx->qpids) {
 740                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 741                 list_del_init(&entry->entry);
 742                 if (!(entry->qid & rdev->qpmask)) {
 743                         c4iw_put_resource(&rdev->resource.qid_table,
 744                                           entry->qid);
 745                         mutex_lock(&rdev->stats.lock);
 746                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 747                         mutex_unlock(&rdev->stats.lock);
 748                 }
 749                 kfree(entry);
 750         }
 751
 752         list_for_each_safe(pos, nxt, &uctx->qpids) {
 753                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 754                 list_del_init(&entry->entry);
 755                 kfree(entry);
 756         }
 757         mutex_unlock(&uctx->lock);
 758 }
 759
 760 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 761                             struct c4iw_dev_ucontext *uctx)
 762 {
 763         INIT_LIST_HEAD(&uctx->qpids);
 764         INIT_LIST_HEAD(&uctx->cqids);
 765         mutex_init(&uctx->lock);
 766 }
 767
 768 /* Caller takes care of locking if needed */
 769 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 770 {
 771         int err;
 772
 773         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 774
 775         /*
 776          * This implementation assumes udb_density == ucq_density!  Eventually
 777          * we might need to support this but for now fail the open. Also the
 778          * cqid and qpid range must match for now.
 779          */
 780         if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 781                 pr_err(MOD "%s: unsupported udb/ucq densities %u/%u\n",
 782                        pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 783                        rdev->lldi.ucq_density);
 784                 err = -EINVAL;
 785                 goto err1;
 786         }
 787         if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 788             rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 789                 pr_err(MOD "%s: unsupported qp and cq id ranges "
 790                        "qp start %u size %u cq start %u size %u\n",
 791                        pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 792                        rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 793                        rdev->lldi.vr->cq.size);
 794                 err = -EINVAL;
 795                 goto err1;
 796         }
 797
 798         /*
 799          * qpshift is the number of bits to shift the qpid left in order
 800          * to get the correct address of the doorbell for that qp.
 801          */
 802         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 803         rdev->qpmask = rdev->lldi.udb_density - 1;
 804         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 805         rdev->cqmask = rdev->lldi.ucq_density - 1;
 806         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 807              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 808              "qp qid start %u size %u cq qid start %u size %u\n",
 809              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 810              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 811              rdev->lldi.vr->pbl.start,
 812              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 813              rdev->lldi.vr->rq.size,
 814              rdev->lldi.vr->qp.start,
 815              rdev->lldi.vr->qp.size,
 816              rdev->lldi.vr->cq.start,
 817              rdev->lldi.vr->cq.size);
 818         PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
 819              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 820              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 821              (void *)pci_resource_start(rdev->lldi.pdev, 2),
 822              rdev->lldi.db_reg,
 823              rdev->lldi.gts_reg,
 824              rdev->qpshift, rdev->qpmask,
 825              rdev->cqshift, rdev->cqmask);
 826
 827         if (c4iw_num_stags(rdev) == 0) {
 828                 err = -EINVAL;
 829                 goto err1;
 830         }
 831
 832         rdev->stats.pd.total = T4_MAX_NUM_PD;
 833         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 834         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 835         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 836         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 837         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 838
 839         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 840         if (err) {
 841                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 842                 goto err1;
 843         }
 844         err = c4iw_pblpool_create(rdev);
 845         if (err) {
 846                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 847                 goto err2;
 848         }
 849         err = c4iw_rqtpool_create(rdev);
 850         if (err) {
 851                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 852                 goto err3;
 853         }
 854         err = c4iw_ocqp_pool_create(rdev);
 855         if (err) {
 856                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 857                 goto err4;
 858         }
 859         rdev->status_page = (struct t4_dev_status_page *)
 860                             __get_free_page(GFP_KERNEL);
 861         if (!rdev->status_page) {
 862                 pr_err(MOD "error allocating status page\n");
 863                 goto err4;
 864         }
 865
 866         if (c4iw_wr_log) {
 867                 rdev->wr_log = kzalloc((1 << c4iw_wr_log_size_order) *
 868                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 869                 if (rdev->wr_log) {
 870                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 871                         atomic_set(&rdev->wr_log_idx, 0);
 872                 } else {
 873                         pr_err(MOD "error allocating wr_log. Logging disabled\n");
 874                 }
 875         }
 876
 877         rdev->status_page->db_off = 0;
 878
 879         return 0;
 880 err4:
 881         c4iw_rqtpool_destroy(rdev);
 882 err3:
 883         c4iw_pblpool_destroy(rdev);
 884 err2:
 885         c4iw_destroy_resource(&rdev->resource);
 886 err1:
 887         return err;
 888 }
 889
 890 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 891 {
 892         kfree(rdev->wr_log);
 893         free_page((unsigned long)rdev->status_page);
 894         c4iw_pblpool_destroy(rdev);
 895         c4iw_rqtpool_destroy(rdev);
 896         c4iw_destroy_resource(&rdev->resource);
 897 }
 898
 899 static void c4iw_dealloc(struct uld_ctx *ctx)
 900 {
 901         c4iw_rdev_close(&ctx->dev->rdev);
 902         idr_destroy(&ctx->dev->cqidr);
 903         idr_destroy(&ctx->dev->qpidr);
 904         idr_destroy(&ctx->dev->mmidr);
 905         idr_destroy(&ctx->dev->hwtid_idr);
 906         idr_destroy(&ctx->dev->stid_idr);
 907         idr_destroy(&ctx->dev->atid_idr);
 908         if (ctx->dev->rdev.bar2_kva)
 909                 iounmap(ctx->dev->rdev.bar2_kva);
 910         if (ctx->dev->rdev.oc_mw_kva)
 911                 iounmap(ctx->dev->rdev.oc_mw_kva);
 912         ib_dealloc_device(&ctx->dev->ibdev);
 913         ctx->dev = NULL;
 914 }
 915
 916 static void c4iw_remove(struct uld_ctx *ctx)
 917 {
 918         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 919         c4iw_unregister_device(ctx->dev);
 920         c4iw_dealloc(ctx);
 921 }
 922
 923 static int rdma_supported(const struct cxgb4_lld_info *infop)
 924 {
 925         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 926                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 927                infop->vr->cq.size > 0;
 928 }
 929
 930 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 931 {
 932         struct c4iw_dev *devp;
 933         int ret;
 934
 935         if (!rdma_supported(infop)) {
 936                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 937                        pci_name(infop->pdev));
 938                 return ERR_PTR(-ENOSYS);
 939         }
 940         if (!ocqp_supported(infop))
 941                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 942                         pci_name(infop->pdev));
 943
 944         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 945         if (!devp) {
 946                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 947                 return ERR_PTR(-ENOMEM);
 948         }
 949         devp->rdev.lldi = *infop;
 950
 951         /* init various hw-queue params based on lld info */
 952         PDBG("%s: Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 953              __func__, devp->rdev.lldi.sge_ingpadboundary,
 954              devp->rdev.lldi.sge_egrstatuspagesize);
 955
 956         devp->rdev.hw_queue.t4_eq_status_entries =
 957                 devp->rdev.lldi.sge_ingpadboundary > 64 ? 2 : 1;
 958         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 959         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 960         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 961                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 962         devp->rdev.hw_queue.t4_max_sq_size =
 963                 devp->rdev.hw_queue.t4_max_eq_size -
 964                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 965         devp->rdev.hw_queue.t4_max_qp_depth =
 966                 devp->rdev.hw_queue.t4_max_rq_size;
 967         devp->rdev.hw_queue.t4_max_cq_depth =
 968                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 969         devp->rdev.hw_queue.t4_stat_len =
 970                 devp->rdev.lldi.sge_egrstatuspagesize;
 971
 972         /*
 973          * For T5 devices, we map all of BAR2 with WC.
 974          * For T4 devices with onchip qp mem, we map only that part
 975          * of BAR2 with WC.
 976          */
 977         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 978         if (is_t5(devp->rdev.lldi.adapter_type)) {
 979                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 980                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 981                 if (!devp->rdev.bar2_kva) {
 982                         pr_err(MOD "Unable to ioremap BAR2\n");
 983                         ib_dealloc_device(&devp->ibdev);
 984                         return ERR_PTR(-EINVAL);
 985                 }
 986         } else if (ocqp_supported(infop)) {
 987                 devp->rdev.oc_mw_pa =
 988                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
 989                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
 990                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
 991                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 992                         devp->rdev.lldi.vr->ocq.size);
 993                 if (!devp->rdev.oc_mw_kva) {
 994                         pr_err(MOD "Unable to ioremap onchip mem\n");
 995                         ib_dealloc_device(&devp->ibdev);
 996                         return ERR_PTR(-EINVAL);
 997                 }
 998         }
 999
1000         PDBG(KERN_INFO MOD "ocq memory: "
1001                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1002                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1003                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1004
1005         ret = c4iw_rdev_open(&devp->rdev);
1006         if (ret) {
1007                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
1008                 ib_dealloc_device(&devp->ibdev);
1009                 return ERR_PTR(ret);
1010         }
1011
1012         idr_init(&devp->cqidr);
1013         idr_init(&devp->qpidr);
1014         idr_init(&devp->mmidr);
1015         idr_init(&devp->hwtid_idr);
1016         idr_init(&devp->stid_idr);
1017         idr_init(&devp->atid_idr);
1018         spin_lock_init(&devp->lock);
1019         mutex_init(&devp->rdev.stats.lock);
1020         mutex_init(&devp->db_mutex);
1021         INIT_LIST_HEAD(&devp->db_fc_list);
1022         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1023
1024         if (c4iw_debugfs_root) {
1025                 devp->debugfs_root = debugfs_create_dir(
1026                                         pci_name(devp->rdev.lldi.pdev),
1027                                         c4iw_debugfs_root);
1028                 setup_debugfs(devp);
1029         }
1030
1031
1032         return devp;
1033 }
1034
1035 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1036 {
1037         struct uld_ctx *ctx;
1038         static int vers_printed;
1039         int i;
1040
1041         if (!vers_printed++)
1042                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1043                         DRV_VERSION);
1044
1045         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1046         if (!ctx) {
1047                 ctx = ERR_PTR(-ENOMEM);
1048                 goto out;
1049         }
1050         ctx->lldi = *infop;
1051
1052         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1053              __func__, pci_name(ctx->lldi.pdev),
1054              ctx->lldi.nchan, ctx->lldi.nrxq,
1055              ctx->lldi.ntxq, ctx->lldi.nports);
1056
1057         mutex_lock(&dev_mutex);
1058         list_add_tail(&ctx->entry, &uld_ctx_list);
1059         mutex_unlock(&dev_mutex);
1060
1061         for (i = 0; i < ctx->lldi.nrxq; i++)
1062                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1063 out:
1064         return ctx;
1065 }
1066
1067 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1068                                                  const __be64 *rsp,
1069                                                  u32 pktshift)
1070 {
1071         struct sk_buff *skb;
1072
1073         /*
1074          * Allocate space for cpl_pass_accept_req which will be synthesized by
1075          * driver. Once the driver synthesizes the request the skb will go
1076          * through the regular cpl_pass_accept_req processing.
1077          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1078          * cpl_rx_pkt.
1079          */
1080         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1081                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1082         if (unlikely(!skb))
1083                 return NULL;
1084
1085          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1086                    sizeof(struct rss_header) - pktshift);
1087
1088         /*
1089          * This skb will contain:
1090          *   rss_header from the rspq descriptor (1 flit)
1091          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1092          *   space for the difference between the size of an
1093          *      rx_pkt and pass_accept_req cpl (1 flit)
1094          *   the packet data from the gl
1095          */
1096         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1097                                 sizeof(struct rss_header));
1098         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1099                                        sizeof(struct cpl_pass_accept_req),
1100                                        gl->va + pktshift,
1101                                        gl->tot_len - pktshift);
1102         return skb;
1103 }
1104
1105 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1106                            const __be64 *rsp)
1107 {
1108         unsigned int opcode = *(u8 *)rsp;
1109         struct sk_buff *skb;
1110
1111         if (opcode != CPL_RX_PKT)
1112                 goto out;
1113
1114         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1115         if (skb == NULL)
1116                 goto out;
1117
1118         if (c4iw_handlers[opcode] == NULL) {
1119                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1120                        opcode);
1121                 kfree_skb(skb);
1122                 goto out;
1123         }
1124         c4iw_handlers[opcode](dev, skb);
1125         return 1;
1126 out:
1127         return 0;
1128 }
1129
1130 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1131                         const struct pkt_gl *gl)
1132 {
1133         struct uld_ctx *ctx = handle;
1134         struct c4iw_dev *dev = ctx->dev;
1135         struct sk_buff *skb;
1136         u8 opcode;
1137
1138         if (gl == NULL) {
1139                 /* omit RSS and rsp_ctrl at end of descriptor */
1140                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1141
1142                 skb = alloc_skb(256, GFP_ATOMIC);
1143                 if (!skb)
1144                         goto nomem;
1145                 __skb_put(skb, len);
1146                 skb_copy_to_linear_data(skb, &rsp[1], len);
1147         } else if (gl == CXGB4_MSG_AN) {
1148                 const struct rsp_ctrl *rc = (void *)rsp;
1149
1150                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1151                 c4iw_ev_handler(dev, qid);
1152                 return 0;
1153         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1154                 if (recv_rx_pkt(dev, gl, rsp))
1155                         return 0;
1156
1157                 pr_info("%s: unexpected FL contents at %p, " \
1158                        "RSS %#llx, FL %#llx, len %u\n",
1159                        pci_name(ctx->lldi.pdev), gl->va,
1160                        (unsigned long long)be64_to_cpu(*rsp),
1161                        (unsigned long long)be64_to_cpu(
1162                        *(__force __be64 *)gl->va),
1163                        gl->tot_len);
1164
1165                 return 0;
1166         } else {
1167                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1168                 if (unlikely(!skb))
1169                         goto nomem;
1170         }
1171
1172         opcode = *(u8 *)rsp;
1173         if (c4iw_handlers[opcode]) {
1174                 c4iw_handlers[opcode](dev, skb);
1175         } else {
1176                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1177                        opcode);
1178                 kfree_skb(skb);
1179         }
1180
1181         return 0;
1182 nomem:
1183         return -1;
1184 }
1185
1186 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1187 {
1188         struct uld_ctx *ctx = handle;
1189
1190         PDBG("%s new_state %u\n", __func__, new_state);
1191         switch (new_state) {
1192         case CXGB4_STATE_UP:
1193                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
1194                 if (!ctx->dev) {
1195                         int ret;
1196
1197                         ctx->dev = c4iw_alloc(&ctx->lldi);
1198                         if (IS_ERR(ctx->dev)) {
1199                                 printk(KERN_ERR MOD
1200                                        "%s: initialization failed: %ld\n",
1201                                        pci_name(ctx->lldi.pdev),
1202                                        PTR_ERR(ctx->dev));
1203                                 ctx->dev = NULL;
1204                                 break;
1205                         }
1206                         ret = c4iw_register_device(ctx->dev);
1207                         if (ret) {
1208                                 printk(KERN_ERR MOD
1209                                        "%s: RDMA registration failed: %d\n",
1210                                        pci_name(ctx->lldi.pdev), ret);
1211                                 c4iw_dealloc(ctx);
1212                         }
1213                 }
1214                 break;
1215         case CXGB4_STATE_DOWN:
1216                 printk(KERN_INFO MOD "%s: Down\n",
1217                        pci_name(ctx->lldi.pdev));
1218                 if (ctx->dev)
1219                         c4iw_remove(ctx);
1220                 break;
1221         case CXGB4_STATE_START_RECOVERY:
1222                 printk(KERN_INFO MOD "%s: Fatal Error\n",
1223                        pci_name(ctx->lldi.pdev));
1224                 if (ctx->dev) {
1225                         struct ib_event event;
1226
1227                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1228                         memset(&event, 0, sizeof event);
1229                         event.event  = IB_EVENT_DEVICE_FATAL;
1230                         event.device = &ctx->dev->ibdev;
1231                         ib_dispatch_event(&event);
1232                         c4iw_remove(ctx);
1233                 }
1234                 break;
1235         case CXGB4_STATE_DETACH:
1236                 printk(KERN_INFO MOD "%s: Detach\n",
1237                        pci_name(ctx->lldi.pdev));
1238                 if (ctx->dev)
1239                         c4iw_remove(ctx);
1240                 break;
1241         }
1242         return 0;
1243 }
1244
1245 static int disable_qp_db(int id, void *p, void *data)
1246 {
1247         struct c4iw_qp *qp = p;
1248
1249         t4_disable_wq_db(&qp->wq);
1250         return 0;
1251 }
1252
1253 static void stop_queues(struct uld_ctx *ctx)
1254 {
1255         unsigned long flags;
1256
1257         spin_lock_irqsave(&ctx->dev->lock, flags);
1258         ctx->dev->rdev.stats.db_state_transitions++;
1259         ctx->dev->db_state = STOPPED;
1260         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1261                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1262         else
1263                 ctx->dev->rdev.status_page->db_off = 1;
1264         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1265 }
1266
1267 static int enable_qp_db(int id, void *p, void *data)
1268 {
1269         struct c4iw_qp *qp = p;
1270
1271         t4_enable_wq_db(&qp->wq);
1272         return 0;
1273 }
1274
1275 static void resume_rc_qp(struct c4iw_qp *qp)
1276 {
1277         spin_lock(&qp->lock);
1278         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc,
1279                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1280         qp->wq.sq.wq_pidx_inc = 0;
1281         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
1282                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1283         qp->wq.rq.wq_pidx_inc = 0;
1284         spin_unlock(&qp->lock);
1285 }
1286
1287 static void resume_a_chunk(struct uld_ctx *ctx)
1288 {
1289         int i;
1290         struct c4iw_qp *qp;
1291
1292         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1293                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1294                                       db_fc_entry);
1295                 list_del_init(&qp->db_fc_entry);
1296                 resume_rc_qp(qp);
1297                 if (list_empty(&ctx->dev->db_fc_list))
1298                         break;
1299         }
1300 }
1301
1302 static void resume_queues(struct uld_ctx *ctx)
1303 {
1304         spin_lock_irq(&ctx->dev->lock);
1305         if (ctx->dev->db_state != STOPPED)
1306                 goto out;
1307         ctx->dev->db_state = FLOW_CONTROL;
1308         while (1) {
1309                 if (list_empty(&ctx->dev->db_fc_list)) {
1310                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1311                         ctx->dev->db_state = NORMAL;
1312                         ctx->dev->rdev.stats.db_state_transitions++;
1313                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1314                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1315                                              NULL);
1316                         } else {
1317                                 ctx->dev->rdev.status_page->db_off = 0;
1318                         }
1319                         break;
1320                 } else {
1321                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1322                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1323                                DB_FC_DRAIN_THRESH)) {
1324                                 resume_a_chunk(ctx);
1325                         }
1326                         if (!list_empty(&ctx->dev->db_fc_list)) {
1327                                 spin_unlock_irq(&ctx->dev->lock);
1328                                 if (DB_FC_RESUME_DELAY) {
1329                                         set_current_state(TASK_UNINTERRUPTIBLE);
1330                                         schedule_timeout(DB_FC_RESUME_DELAY);
1331                                 }
1332                                 spin_lock_irq(&ctx->dev->lock);
1333                                 if (ctx->dev->db_state != FLOW_CONTROL)
1334                                         break;
1335                         }
1336                 }
1337         }
1338 out:
1339         if (ctx->dev->db_state != NORMAL)
1340                 ctx->dev->rdev.stats.db_fc_interruptions++;
1341         spin_unlock_irq(&ctx->dev->lock);
1342 }
1343
1344 struct qp_list {
1345         unsigned idx;
1346         struct c4iw_qp **qps;
1347 };
1348
1349 static int add_and_ref_qp(int id, void *p, void *data)
1350 {
1351         struct qp_list *qp_listp = data;
1352         struct c4iw_qp *qp = p;
1353
1354         c4iw_qp_add_ref(&qp->ibqp);
1355         qp_listp->qps[qp_listp->idx++] = qp;
1356         return 0;
1357 }
1358
1359 static int count_qps(int id, void *p, void *data)
1360 {
1361         unsigned *countp = data;
1362         (*countp)++;
1363         return 0;
1364 }
1365
1366 static void deref_qps(struct qp_list *qp_list)
1367 {
1368         int idx;
1369
1370         for (idx = 0; idx < qp_list->idx; idx++)
1371                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1372 }
1373
1374 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1375 {
1376         int idx;
1377         int ret;
1378
1379         for (idx = 0; idx < qp_list->idx; idx++) {
1380                 struct c4iw_qp *qp = qp_list->qps[idx];
1381
1382                 spin_lock_irq(&qp->rhp->lock);
1383                 spin_lock(&qp->lock);
1384                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1385                                           qp->wq.sq.qid,
1386                                           t4_sq_host_wq_pidx(&qp->wq),
1387                                           t4_sq_wq_size(&qp->wq));
1388                 if (ret) {
1389                         pr_err(MOD "%s: Fatal error - "
1390                                "DB overflow recovery failed - "
1391                                "error syncing SQ qid %u\n",
1392                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1393                         spin_unlock(&qp->lock);
1394                         spin_unlock_irq(&qp->rhp->lock);
1395                         return;
1396                 }
1397                 qp->wq.sq.wq_pidx_inc = 0;
1398
1399                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1400                                           qp->wq.rq.qid,
1401                                           t4_rq_host_wq_pidx(&qp->wq),
1402                                           t4_rq_wq_size(&qp->wq));
1403
1404                 if (ret) {
1405                         pr_err(MOD "%s: Fatal error - "
1406                                "DB overflow recovery failed - "
1407                                "error syncing RQ qid %u\n",
1408                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1409                         spin_unlock(&qp->lock);
1410                         spin_unlock_irq(&qp->rhp->lock);
1411                         return;
1412                 }
1413                 qp->wq.rq.wq_pidx_inc = 0;
1414                 spin_unlock(&qp->lock);
1415                 spin_unlock_irq(&qp->rhp->lock);
1416
1417                 /* Wait for the dbfifo to drain */
1418                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1419                         set_current_state(TASK_UNINTERRUPTIBLE);
1420                         schedule_timeout(usecs_to_jiffies(10));
1421                 }
1422         }
1423 }
1424
1425 static void recover_queues(struct uld_ctx *ctx)
1426 {
1427         int count = 0;
1428         struct qp_list qp_list;
1429         int ret;
1430
1431         /* slow everybody down */
1432         set_current_state(TASK_UNINTERRUPTIBLE);
1433         schedule_timeout(usecs_to_jiffies(1000));
1434
1435         /* flush the SGE contexts */
1436         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1437         if (ret) {
1438                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1439                        pci_name(ctx->lldi.pdev));
1440                 return;
1441         }
1442
1443         /* Count active queues so we can build a list of queues to recover */
1444         spin_lock_irq(&ctx->dev->lock);
1445         WARN_ON(ctx->dev->db_state != STOPPED);
1446         ctx->dev->db_state = RECOVERY;
1447         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1448
1449         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1450         if (!qp_list.qps) {
1451                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1452                        pci_name(ctx->lldi.pdev));
1453                 spin_unlock_irq(&ctx->dev->lock);
1454                 return;
1455         }
1456         qp_list.idx = 0;
1457
1458         /* add and ref each qp so it doesn't get freed */
1459         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1460
1461         spin_unlock_irq(&ctx->dev->lock);
1462
1463         /* now traverse the list in a safe context to recover the db state*/
1464         recover_lost_dbs(ctx, &qp_list);
1465
1466         /* we're almost done!  deref the qps and clean up */
1467         deref_qps(&qp_list);
1468         kfree(qp_list.qps);
1469
1470         spin_lock_irq(&ctx->dev->lock);
1471         WARN_ON(ctx->dev->db_state != RECOVERY);
1472         ctx->dev->db_state = STOPPED;
1473         spin_unlock_irq(&ctx->dev->lock);
1474 }
1475
1476 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1477 {
1478         struct uld_ctx *ctx = handle;
1479
1480         switch (control) {
1481         case CXGB4_CONTROL_DB_FULL:
1482                 stop_queues(ctx);
1483                 ctx->dev->rdev.stats.db_full++;
1484                 break;
1485         case CXGB4_CONTROL_DB_EMPTY:
1486                 resume_queues(ctx);
1487                 mutex_lock(&ctx->dev->rdev.stats.lock);
1488                 ctx->dev->rdev.stats.db_empty++;
1489                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1490                 break;
1491         case CXGB4_CONTROL_DB_DROP:
1492                 recover_queues(ctx);
1493                 mutex_lock(&ctx->dev->rdev.stats.lock);
1494                 ctx->dev->rdev.stats.db_drop++;
1495                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1496                 break;
1497         default:
1498                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1499                        pci_name(ctx->lldi.pdev), control);
1500                 break;
1501         }
1502         return 0;
1503 }
1504
1505 static struct cxgb4_uld_info c4iw_uld_info = {
1506         .name = DRV_NAME,
1507         .add = c4iw_uld_add,
1508         .rx_handler = c4iw_uld_rx_handler,
1509         .state_change = c4iw_uld_state_change,
1510         .control = c4iw_uld_control,
1511 };
1512
1513 static int __init c4iw_init_module(void)
1514 {
1515         int err;
1516
1517         err = c4iw_cm_init();
1518         if (err)
1519                 return err;
1520
1521         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1522         if (!c4iw_debugfs_root)
1523                 printk(KERN_WARNING MOD
1524                        "could not create debugfs entry, continuing\n");
1525
1526         if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1527                             c4iw_nl_cb_table))
1528                 pr_err("%s[%u]: Failed to add netlink callback\n"
1529                        , __func__, __LINE__);
1530
1531         err = iwpm_init(RDMA_NL_C4IW);
1532         if (err) {
1533                 pr_err("port mapper initialization failed with %d\n", err);
1534                 ibnl_remove_client(RDMA_NL_C4IW);
1535                 c4iw_cm_term();
1536                 debugfs_remove_recursive(c4iw_debugfs_root);
1537                 return err;
1538         }
1539
1540         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1541
1542         return 0;
1543 }
1544
1545 static void __exit c4iw_exit_module(void)
1546 {
1547         struct uld_ctx *ctx, *tmp;
1548
1549         mutex_lock(&dev_mutex);
1550         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1551                 if (ctx->dev)
1552                         c4iw_remove(ctx);
1553                 kfree(ctx);
1554         }
1555         mutex_unlock(&dev_mutex);
1556         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1557         iwpm_exit(RDMA_NL_C4IW);
1558         ibnl_remove_client(RDMA_NL_C4IW);
1559         c4iw_cm_term();
1560         debugfs_remove_recursive(c4iw_debugfs_root);
1561 }
1562
1563 module_init(c4iw_init_module);
1564 module_exit(c4iw_exit_module);