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 count = 1;
 319
 320         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 321         if (!qpd)
 322                 return -ENOMEM;
 323
 324         qpd->devp = inode->i_private;
 325         qpd->pos = 0;
 326
 327         spin_lock_irq(&qpd->devp->lock);
 328         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 329         spin_unlock_irq(&qpd->devp->lock);
 330
 331         qpd->bufsize = count * 128;
 332         qpd->buf = vmalloc(qpd->bufsize);
 333         if (!qpd->buf) {
 334                 kfree(qpd);
 335                 return -ENOMEM;
 336         }
 337
 338         spin_lock_irq(&qpd->devp->lock);
 339         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 340         spin_unlock_irq(&qpd->devp->lock);
 341
 342         qpd->buf[qpd->pos++] = 0;
 343         file->private_data = qpd;
 344         return 0;
 345 }
 346
 347 static const struct file_operations qp_debugfs_fops = {
 348         .owner   = THIS_MODULE,
 349         .open    = qp_open,
 350         .release = qp_release,
 351         .read    = debugfs_read,
 352         .llseek  = default_llseek,
 353 };
 354
 355 static int dump_stag(int id, void *p, void *data)
 356 {
 357         struct c4iw_debugfs_data *stagd = data;
 358         int space;
 359         int cc;
 360         struct fw_ri_tpte tpte;
 361         int ret;
 362
 363         space = stagd->bufsize - stagd->pos - 1;
 364         if (space == 0)
 365                 return 1;
 366
 367         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 368                               (__be32 *)&tpte);
 369         if (ret) {
 370                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 371                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 372                 return ret;
 373         }
 374         cc = snprintf(stagd->buf + stagd->pos, space,
 375                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 376                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 377                       (u32)id<<8,
 378                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 379                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 380                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 381                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 382                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 383                       FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 384                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 385                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 386         if (cc < space)
 387                 stagd->pos += cc;
 388         return 0;
 389 }
 390
 391 static int stag_release(struct inode *inode, struct file *file)
 392 {
 393         struct c4iw_debugfs_data *stagd = file->private_data;
 394         if (!stagd) {
 395                 printk(KERN_INFO "%s null stagd?\n", __func__);
 396                 return 0;
 397         }
 398         vfree(stagd->buf);
 399         kfree(stagd);
 400         return 0;
 401 }
 402
 403 static int stag_open(struct inode *inode, struct file *file)
 404 {
 405         struct c4iw_debugfs_data *stagd;
 406         int ret = 0;
 407         int count = 1;
 408
 409         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 410         if (!stagd) {
 411                 ret = -ENOMEM;
 412                 goto out;
 413         }
 414         stagd->devp = inode->i_private;
 415         stagd->pos = 0;
 416
 417         spin_lock_irq(&stagd->devp->lock);
 418         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 419         spin_unlock_irq(&stagd->devp->lock);
 420
 421         stagd->bufsize = count * 256;
 422         stagd->buf = vmalloc(stagd->bufsize);
 423         if (!stagd->buf) {
 424                 ret = -ENOMEM;
 425                 goto err1;
 426         }
 427
 428         spin_lock_irq(&stagd->devp->lock);
 429         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 430         spin_unlock_irq(&stagd->devp->lock);
 431
 432         stagd->buf[stagd->pos++] = 0;
 433         file->private_data = stagd;
 434         goto out;
 435 err1:
 436         kfree(stagd);
 437 out:
 438         return ret;
 439 }
 440
 441 static const struct file_operations stag_debugfs_fops = {
 442         .owner   = THIS_MODULE,
 443         .open    = stag_open,
 444         .release = stag_release,
 445         .read    = debugfs_read,
 446         .llseek  = default_llseek,
 447 };
 448
 449 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 450
 451 static int stats_show(struct seq_file *seq, void *v)
 452 {
 453         struct c4iw_dev *dev = seq->private;
 454
 455         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 456                    "Max", "Fail");
 457         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 458                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 459                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 460         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 461                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 462                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 463         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 464                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 465                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 466         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 467                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 468                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 469         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 470                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 471                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 472         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 473                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 474                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 475         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 476         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 477         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 478         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 479                    db_state_str[dev->db_state],
 480                    dev->rdev.stats.db_state_transitions,
 481                    dev->rdev.stats.db_fc_interruptions);
 482         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 483         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 484                    dev->rdev.stats.act_ofld_conn_fails);
 485         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 486                    dev->rdev.stats.pas_ofld_conn_fails);
 487         seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 488         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 489         return 0;
 490 }
 491
 492 static int stats_open(struct inode *inode, struct file *file)
 493 {
 494         return single_open(file, stats_show, inode->i_private);
 495 }
 496
 497 static ssize_t stats_clear(struct file *file, const char __user *buf,
 498                 size_t count, loff_t *pos)
 499 {
 500         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 501
 502         mutex_lock(&dev->rdev.stats.lock);
 503         dev->rdev.stats.pd.max = 0;
 504         dev->rdev.stats.pd.fail = 0;
 505         dev->rdev.stats.qid.max = 0;
 506         dev->rdev.stats.qid.fail = 0;
 507         dev->rdev.stats.stag.max = 0;
 508         dev->rdev.stats.stag.fail = 0;
 509         dev->rdev.stats.pbl.max = 0;
 510         dev->rdev.stats.pbl.fail = 0;
 511         dev->rdev.stats.rqt.max = 0;
 512         dev->rdev.stats.rqt.fail = 0;
 513         dev->rdev.stats.ocqp.max = 0;
 514         dev->rdev.stats.ocqp.fail = 0;
 515         dev->rdev.stats.db_full = 0;
 516         dev->rdev.stats.db_empty = 0;
 517         dev->rdev.stats.db_drop = 0;
 518         dev->rdev.stats.db_state_transitions = 0;
 519         dev->rdev.stats.tcam_full = 0;
 520         dev->rdev.stats.act_ofld_conn_fails = 0;
 521         dev->rdev.stats.pas_ofld_conn_fails = 0;
 522         mutex_unlock(&dev->rdev.stats.lock);
 523         return count;
 524 }
 525
 526 static const struct file_operations stats_debugfs_fops = {
 527         .owner   = THIS_MODULE,
 528         .open    = stats_open,
 529         .release = single_release,
 530         .read    = seq_read,
 531         .llseek  = seq_lseek,
 532         .write   = stats_clear,
 533 };
 534
 535 static int dump_ep(int id, void *p, void *data)
 536 {
 537         struct c4iw_ep *ep = p;
 538         struct c4iw_debugfs_data *epd = data;
 539         int space;
 540         int cc;
 541
 542         space = epd->bufsize - epd->pos - 1;
 543         if (space == 0)
 544                 return 1;
 545
 546         if (ep->com.local_addr.ss_family == AF_INET) {
 547                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 548                         &ep->com.local_addr;
 549                 struct sockaddr_in *rsin = (struct sockaddr_in *)
 550                         &ep->com.remote_addr;
 551                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 552                         &ep->com.mapped_local_addr;
 553                 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 554                         &ep->com.mapped_remote_addr;
 555
 556                 cc = snprintf(epd->buf + epd->pos, space,
 557                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 558                               "history 0x%lx hwtid %d atid %d "
 559                               "conn_na %u abort_na %u "
 560                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 561                               ep, ep->com.cm_id, ep->com.qp,
 562                               (int)ep->com.state, ep->com.flags,
 563                               ep->com.history, ep->hwtid, ep->atid,
 564                               ep->stats.connect_neg_adv,
 565                               ep->stats.abort_neg_adv,
 566                               &lsin->sin_addr, ntohs(lsin->sin_port),
 567                               ntohs(mapped_lsin->sin_port),
 568                               &rsin->sin_addr, ntohs(rsin->sin_port),
 569                               ntohs(mapped_rsin->sin_port));
 570         } else {
 571                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 572                         &ep->com.local_addr;
 573                 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 574                         &ep->com.remote_addr;
 575                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 576                         &ep->com.mapped_local_addr;
 577                 struct sockaddr_in6 *mapped_rsin6 = (struct sockaddr_in6 *)
 578                         &ep->com.mapped_remote_addr;
 579
 580                 cc = snprintf(epd->buf + epd->pos, space,
 581                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 582                               "history 0x%lx hwtid %d atid %d "
 583                               "conn_na %u abort_na %u "
 584                               "%pI6:%d/%d <-> %pI6:%d/%d\n",
 585                               ep, ep->com.cm_id, ep->com.qp,
 586                               (int)ep->com.state, ep->com.flags,
 587                               ep->com.history, ep->hwtid, ep->atid,
 588                               ep->stats.connect_neg_adv,
 589                               ep->stats.abort_neg_adv,
 590                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 591                               ntohs(mapped_lsin6->sin6_port),
 592                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 593                               ntohs(mapped_rsin6->sin6_port));
 594         }
 595         if (cc < space)
 596                 epd->pos += cc;
 597         return 0;
 598 }
 599
 600 static int dump_listen_ep(int id, void *p, void *data)
 601 {
 602         struct c4iw_listen_ep *ep = p;
 603         struct c4iw_debugfs_data *epd = data;
 604         int space;
 605         int cc;
 606
 607         space = epd->bufsize - epd->pos - 1;
 608         if (space == 0)
 609                 return 1;
 610
 611         if (ep->com.local_addr.ss_family == AF_INET) {
 612                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 613                         &ep->com.local_addr;
 614                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 615                         &ep->com.mapped_local_addr;
 616
 617                 cc = snprintf(epd->buf + epd->pos, space,
 618                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 619                               "backlog %d %pI4:%d/%d\n",
 620                               ep, ep->com.cm_id, (int)ep->com.state,
 621                               ep->com.flags, ep->stid, ep->backlog,
 622                               &lsin->sin_addr, ntohs(lsin->sin_port),
 623                               ntohs(mapped_lsin->sin_port));
 624         } else {
 625                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 626                         &ep->com.local_addr;
 627                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 628                         &ep->com.mapped_local_addr;
 629
 630                 cc = snprintf(epd->buf + epd->pos, space,
 631                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 632                               "backlog %d %pI6:%d/%d\n",
 633                               ep, ep->com.cm_id, (int)ep->com.state,
 634                               ep->com.flags, ep->stid, ep->backlog,
 635                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 636                               ntohs(mapped_lsin6->sin6_port));
 637         }
 638         if (cc < space)
 639                 epd->pos += cc;
 640         return 0;
 641 }
 642
 643 static int ep_release(struct inode *inode, struct file *file)
 644 {
 645         struct c4iw_debugfs_data *epd = file->private_data;
 646         if (!epd) {
 647                 pr_info("%s null qpd?\n", __func__);
 648                 return 0;
 649         }
 650         vfree(epd->buf);
 651         kfree(epd);
 652         return 0;
 653 }
 654
 655 static int ep_open(struct inode *inode, struct file *file)
 656 {
 657         struct c4iw_debugfs_data *epd;
 658         int ret = 0;
 659         int count = 1;
 660
 661         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 662         if (!epd) {
 663                 ret = -ENOMEM;
 664                 goto out;
 665         }
 666         epd->devp = inode->i_private;
 667         epd->pos = 0;
 668
 669         spin_lock_irq(&epd->devp->lock);
 670         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 671         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 672         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 673         spin_unlock_irq(&epd->devp->lock);
 674
 675         epd->bufsize = count * 240;
 676         epd->buf = vmalloc(epd->bufsize);
 677         if (!epd->buf) {
 678                 ret = -ENOMEM;
 679                 goto err1;
 680         }
 681
 682         spin_lock_irq(&epd->devp->lock);
 683         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 684         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 685         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 686         spin_unlock_irq(&epd->devp->lock);
 687
 688         file->private_data = epd;
 689         goto out;
 690 err1:
 691         kfree(epd);
 692 out:
 693         return ret;
 694 }
 695
 696 static const struct file_operations ep_debugfs_fops = {
 697         .owner   = THIS_MODULE,
 698         .open    = ep_open,
 699         .release = ep_release,
 700         .read    = debugfs_read,
 701 };
 702
 703 static int setup_debugfs(struct c4iw_dev *devp)
 704 {
 705         if (!devp->debugfs_root)
 706                 return -1;
 707
 708         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 709                                  (void *)devp, &qp_debugfs_fops, 4096);
 710
 711         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 712                                  (void *)devp, &stag_debugfs_fops, 4096);
 713
 714         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 715                                  (void *)devp, &stats_debugfs_fops, 4096);
 716
 717         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 718                                  (void *)devp, &ep_debugfs_fops, 4096);
 719
 720         if (c4iw_wr_log)
 721                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 722                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 723         return 0;
 724 }
 725
 726 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 727                                struct c4iw_dev_ucontext *uctx)
 728 {
 729         struct list_head *pos, *nxt;
 730         struct c4iw_qid_list *entry;
 731
 732         mutex_lock(&uctx->lock);
 733         list_for_each_safe(pos, nxt, &uctx->qpids) {
 734                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 735                 list_del_init(&entry->entry);
 736                 if (!(entry->qid & rdev->qpmask)) {
 737                         c4iw_put_resource(&rdev->resource.qid_table,
 738                                           entry->qid);
 739                         mutex_lock(&rdev->stats.lock);
 740                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 741                         mutex_unlock(&rdev->stats.lock);
 742                 }
 743                 kfree(entry);
 744         }
 745
 746         list_for_each_safe(pos, nxt, &uctx->qpids) {
 747                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 748                 list_del_init(&entry->entry);
 749                 kfree(entry);
 750         }
 751         mutex_unlock(&uctx->lock);
 752 }
 753
 754 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 755                             struct c4iw_dev_ucontext *uctx)
 756 {
 757         INIT_LIST_HEAD(&uctx->qpids);
 758         INIT_LIST_HEAD(&uctx->cqids);
 759         mutex_init(&uctx->lock);
 760 }
 761
 762 /* Caller takes care of locking if needed */
 763 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 764 {
 765         int err;
 766
 767         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 768
 769         /*
 770          * This implementation assumes udb_density == ucq_density!  Eventually
 771          * we might need to support this but for now fail the open. Also the
 772          * cqid and qpid range must match for now.
 773          */
 774         if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 775                 pr_err(MOD "%s: unsupported udb/ucq densities %u/%u\n",
 776                        pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 777                        rdev->lldi.ucq_density);
 778                 return -EINVAL;
 779         }
 780         if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 781             rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 782                 pr_err(MOD "%s: unsupported qp and cq id ranges "
 783                        "qp start %u size %u cq start %u size %u\n",
 784                        pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 785                        rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 786                        rdev->lldi.vr->cq.size);
 787                 return -EINVAL;
 788         }
 789
 790         rdev->qpmask = rdev->lldi.udb_density - 1;
 791         rdev->cqmask = rdev->lldi.ucq_density - 1;
 792         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 793              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 794              "qp qid start %u size %u cq qid start %u size %u\n",
 795              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 796              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 797              rdev->lldi.vr->pbl.start,
 798              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 799              rdev->lldi.vr->rq.size,
 800              rdev->lldi.vr->qp.start,
 801              rdev->lldi.vr->qp.size,
 802              rdev->lldi.vr->cq.start,
 803              rdev->lldi.vr->cq.size);
 804         PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p "
 805              "qpmask 0x%x cqmask 0x%x\n",
 806              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 807              (void *)pci_resource_start(rdev->lldi.pdev, 2),
 808              rdev->lldi.db_reg, rdev->lldi.gts_reg,
 809              rdev->qpmask, rdev->cqmask);
 810
 811         if (c4iw_num_stags(rdev) == 0)
 812                 return -EINVAL;
 813
 814         rdev->stats.pd.total = T4_MAX_NUM_PD;
 815         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 816         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 817         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 818         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 819         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 820
 821         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 822         if (err) {
 823                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 824                 return err;
 825         }
 826         err = c4iw_pblpool_create(rdev);
 827         if (err) {
 828                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 829                 goto destroy_resource;
 830         }
 831         err = c4iw_rqtpool_create(rdev);
 832         if (err) {
 833                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 834                 goto destroy_pblpool;
 835         }
 836         err = c4iw_ocqp_pool_create(rdev);
 837         if (err) {
 838                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 839                 goto destroy_rqtpool;
 840         }
 841         rdev->status_page = (struct t4_dev_status_page *)
 842                             __get_free_page(GFP_KERNEL);
 843         if (!rdev->status_page)
 844                 goto destroy_ocqp_pool;
 845         rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
 846         rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
 847         rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
 848         rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
 849
 850         if (c4iw_wr_log) {
 851                 rdev->wr_log = kzalloc((1 << c4iw_wr_log_size_order) *
 852                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 853                 if (rdev->wr_log) {
 854                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 855                         atomic_set(&rdev->wr_log_idx, 0);
 856                 } else {
 857                         pr_err(MOD "error allocating wr_log. Logging disabled\n");
 858                 }
 859         }
 860
 861         rdev->status_page->db_off = 0;
 862
 863         return 0;
 864 destroy_ocqp_pool:
 865         c4iw_ocqp_pool_destroy(rdev);
 866 destroy_rqtpool:
 867         c4iw_rqtpool_destroy(rdev);
 868 destroy_pblpool:
 869         c4iw_pblpool_destroy(rdev);
 870 destroy_resource:
 871         c4iw_destroy_resource(&rdev->resource);
 872         return err;
 873 }
 874
 875 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 876 {
 877         kfree(rdev->wr_log);
 878         free_page((unsigned long)rdev->status_page);
 879         c4iw_pblpool_destroy(rdev);
 880         c4iw_rqtpool_destroy(rdev);
 881         c4iw_destroy_resource(&rdev->resource);
 882 }
 883
 884 static void c4iw_dealloc(struct uld_ctx *ctx)
 885 {
 886         c4iw_rdev_close(&ctx->dev->rdev);
 887         idr_destroy(&ctx->dev->cqidr);
 888         idr_destroy(&ctx->dev->qpidr);
 889         idr_destroy(&ctx->dev->mmidr);
 890         idr_destroy(&ctx->dev->hwtid_idr);
 891         idr_destroy(&ctx->dev->stid_idr);
 892         idr_destroy(&ctx->dev->atid_idr);
 893         if (ctx->dev->rdev.bar2_kva)
 894                 iounmap(ctx->dev->rdev.bar2_kva);
 895         if (ctx->dev->rdev.oc_mw_kva)
 896                 iounmap(ctx->dev->rdev.oc_mw_kva);
 897         ib_dealloc_device(&ctx->dev->ibdev);
 898         ctx->dev = NULL;
 899 }
 900
 901 static void c4iw_remove(struct uld_ctx *ctx)
 902 {
 903         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 904         c4iw_unregister_device(ctx->dev);
 905         c4iw_dealloc(ctx);
 906 }
 907
 908 static int rdma_supported(const struct cxgb4_lld_info *infop)
 909 {
 910         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 911                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 912                infop->vr->cq.size > 0;
 913 }
 914
 915 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 916 {
 917         struct c4iw_dev *devp;
 918         int ret;
 919
 920         if (!rdma_supported(infop)) {
 921                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 922                        pci_name(infop->pdev));
 923                 return ERR_PTR(-ENOSYS);
 924         }
 925         if (!ocqp_supported(infop))
 926                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 927                         pci_name(infop->pdev));
 928
 929         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 930         if (!devp) {
 931                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 932                 return ERR_PTR(-ENOMEM);
 933         }
 934         devp->rdev.lldi = *infop;
 935
 936         /* init various hw-queue params based on lld info */
 937         PDBG("%s: Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 938              __func__, devp->rdev.lldi.sge_ingpadboundary,
 939              devp->rdev.lldi.sge_egrstatuspagesize);
 940
 941         devp->rdev.hw_queue.t4_eq_status_entries =
 942                 devp->rdev.lldi.sge_ingpadboundary > 64 ? 2 : 1;
 943         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 944         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 945         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 946                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 947         devp->rdev.hw_queue.t4_max_sq_size =
 948                 devp->rdev.hw_queue.t4_max_eq_size -
 949                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 950         devp->rdev.hw_queue.t4_max_qp_depth =
 951                 devp->rdev.hw_queue.t4_max_rq_size;
 952         devp->rdev.hw_queue.t4_max_cq_depth =
 953                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 954         devp->rdev.hw_queue.t4_stat_len =
 955                 devp->rdev.lldi.sge_egrstatuspagesize;
 956
 957         /*
 958          * For T5/T6 devices, we map all of BAR2 with WC.
 959          * For T4 devices with onchip qp mem, we map only that part
 960          * of BAR2 with WC.
 961          */
 962         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 963         if (!is_t4(devp->rdev.lldi.adapter_type)) {
 964                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 965                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 966                 if (!devp->rdev.bar2_kva) {
 967                         pr_err(MOD "Unable to ioremap BAR2\n");
 968                         ib_dealloc_device(&devp->ibdev);
 969                         return ERR_PTR(-EINVAL);
 970                 }
 971         } else if (ocqp_supported(infop)) {
 972                 devp->rdev.oc_mw_pa =
 973                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
 974                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
 975                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
 976                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 977                         devp->rdev.lldi.vr->ocq.size);
 978                 if (!devp->rdev.oc_mw_kva) {
 979                         pr_err(MOD "Unable to ioremap onchip mem\n");
 980                         ib_dealloc_device(&devp->ibdev);
 981                         return ERR_PTR(-EINVAL);
 982                 }
 983         }
 984
 985         PDBG(KERN_INFO MOD "ocq memory: "
 986                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 987                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 988                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 989
 990         ret = c4iw_rdev_open(&devp->rdev);
 991         if (ret) {
 992                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 993                 ib_dealloc_device(&devp->ibdev);
 994                 return ERR_PTR(ret);
 995         }
 996
 997         idr_init(&devp->cqidr);
 998         idr_init(&devp->qpidr);
 999         idr_init(&devp->mmidr);
1000         idr_init(&devp->hwtid_idr);
1001         idr_init(&devp->stid_idr);
1002         idr_init(&devp->atid_idr);
1003         spin_lock_init(&devp->lock);
1004         mutex_init(&devp->rdev.stats.lock);
1005         mutex_init(&devp->db_mutex);
1006         INIT_LIST_HEAD(&devp->db_fc_list);
1007         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1008
1009         if (c4iw_debugfs_root) {
1010                 devp->debugfs_root = debugfs_create_dir(
1011                                         pci_name(devp->rdev.lldi.pdev),
1012                                         c4iw_debugfs_root);
1013                 setup_debugfs(devp);
1014         }
1015
1016
1017         return devp;
1018 }
1019
1020 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1021 {
1022         struct uld_ctx *ctx;
1023         static int vers_printed;
1024         int i;
1025
1026         if (!vers_printed++)
1027                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1028                         DRV_VERSION);
1029
1030         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1031         if (!ctx) {
1032                 ctx = ERR_PTR(-ENOMEM);
1033                 goto out;
1034         }
1035         ctx->lldi = *infop;
1036
1037         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1038              __func__, pci_name(ctx->lldi.pdev),
1039              ctx->lldi.nchan, ctx->lldi.nrxq,
1040              ctx->lldi.ntxq, ctx->lldi.nports);
1041
1042         mutex_lock(&dev_mutex);
1043         list_add_tail(&ctx->entry, &uld_ctx_list);
1044         mutex_unlock(&dev_mutex);
1045
1046         for (i = 0; i < ctx->lldi.nrxq; i++)
1047                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1048 out:
1049         return ctx;
1050 }
1051
1052 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1053                                                  const __be64 *rsp,
1054                                                  u32 pktshift)
1055 {
1056         struct sk_buff *skb;
1057
1058         /*
1059          * Allocate space for cpl_pass_accept_req which will be synthesized by
1060          * driver. Once the driver synthesizes the request the skb will go
1061          * through the regular cpl_pass_accept_req processing.
1062          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1063          * cpl_rx_pkt.
1064          */
1065         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1066                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1067         if (unlikely(!skb))
1068                 return NULL;
1069
1070          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1071                    sizeof(struct rss_header) - pktshift);
1072
1073         /*
1074          * This skb will contain:
1075          *   rss_header from the rspq descriptor (1 flit)
1076          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1077          *   space for the difference between the size of an
1078          *      rx_pkt and pass_accept_req cpl (1 flit)
1079          *   the packet data from the gl
1080          */
1081         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1082                                 sizeof(struct rss_header));
1083         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1084                                        sizeof(struct cpl_pass_accept_req),
1085                                        gl->va + pktshift,
1086                                        gl->tot_len - pktshift);
1087         return skb;
1088 }
1089
1090 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1091                            const __be64 *rsp)
1092 {
1093         unsigned int opcode = *(u8 *)rsp;
1094         struct sk_buff *skb;
1095
1096         if (opcode != CPL_RX_PKT)
1097                 goto out;
1098
1099         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1100         if (skb == NULL)
1101                 goto out;
1102
1103         if (c4iw_handlers[opcode] == NULL) {
1104                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1105                        opcode);
1106                 kfree_skb(skb);
1107                 goto out;
1108         }
1109         c4iw_handlers[opcode](dev, skb);
1110         return 1;
1111 out:
1112         return 0;
1113 }
1114
1115 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1116                         const struct pkt_gl *gl)
1117 {
1118         struct uld_ctx *ctx = handle;
1119         struct c4iw_dev *dev = ctx->dev;
1120         struct sk_buff *skb;
1121         u8 opcode;
1122
1123         if (gl == NULL) {
1124                 /* omit RSS and rsp_ctrl at end of descriptor */
1125                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1126
1127                 skb = alloc_skb(256, GFP_ATOMIC);
1128                 if (!skb)
1129                         goto nomem;
1130                 __skb_put(skb, len);
1131                 skb_copy_to_linear_data(skb, &rsp[1], len);
1132         } else if (gl == CXGB4_MSG_AN) {
1133                 const struct rsp_ctrl *rc = (void *)rsp;
1134
1135                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1136                 c4iw_ev_handler(dev, qid);
1137                 return 0;
1138         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1139                 if (recv_rx_pkt(dev, gl, rsp))
1140                         return 0;
1141
1142                 pr_info("%s: unexpected FL contents at %p, " \
1143                        "RSS %#llx, FL %#llx, len %u\n",
1144                        pci_name(ctx->lldi.pdev), gl->va,
1145                        (unsigned long long)be64_to_cpu(*rsp),
1146                        (unsigned long long)be64_to_cpu(
1147                        *(__force __be64 *)gl->va),
1148                        gl->tot_len);
1149
1150                 return 0;
1151         } else {
1152                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1153                 if (unlikely(!skb))
1154                         goto nomem;
1155         }
1156
1157         opcode = *(u8 *)rsp;
1158         if (c4iw_handlers[opcode]) {
1159                 c4iw_handlers[opcode](dev, skb);
1160         } else {
1161                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1162                        opcode);
1163                 kfree_skb(skb);
1164         }
1165
1166         return 0;
1167 nomem:
1168         return -1;
1169 }
1170
1171 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1172 {
1173         struct uld_ctx *ctx = handle;
1174
1175         PDBG("%s new_state %u\n", __func__, new_state);
1176         switch (new_state) {
1177         case CXGB4_STATE_UP:
1178                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
1179                 if (!ctx->dev) {
1180                         int ret;
1181
1182                         ctx->dev = c4iw_alloc(&ctx->lldi);
1183                         if (IS_ERR(ctx->dev)) {
1184                                 printk(KERN_ERR MOD
1185                                        "%s: initialization failed: %ld\n",
1186                                        pci_name(ctx->lldi.pdev),
1187                                        PTR_ERR(ctx->dev));
1188                                 ctx->dev = NULL;
1189                                 break;
1190                         }
1191                         ret = c4iw_register_device(ctx->dev);
1192                         if (ret) {
1193                                 printk(KERN_ERR MOD
1194                                        "%s: RDMA registration failed: %d\n",
1195                                        pci_name(ctx->lldi.pdev), ret);
1196                                 c4iw_dealloc(ctx);
1197                         }
1198                 }
1199                 break;
1200         case CXGB4_STATE_DOWN:
1201                 printk(KERN_INFO MOD "%s: Down\n",
1202                        pci_name(ctx->lldi.pdev));
1203                 if (ctx->dev)
1204                         c4iw_remove(ctx);
1205                 break;
1206         case CXGB4_STATE_START_RECOVERY:
1207                 printk(KERN_INFO MOD "%s: Fatal Error\n",
1208                        pci_name(ctx->lldi.pdev));
1209                 if (ctx->dev) {
1210                         struct ib_event event;
1211
1212                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1213                         memset(&event, 0, sizeof event);
1214                         event.event  = IB_EVENT_DEVICE_FATAL;
1215                         event.device = &ctx->dev->ibdev;
1216                         ib_dispatch_event(&event);
1217                         c4iw_remove(ctx);
1218                 }
1219                 break;
1220         case CXGB4_STATE_DETACH:
1221                 printk(KERN_INFO MOD "%s: Detach\n",
1222                        pci_name(ctx->lldi.pdev));
1223                 if (ctx->dev)
1224                         c4iw_remove(ctx);
1225                 break;
1226         }
1227         return 0;
1228 }
1229
1230 static int disable_qp_db(int id, void *p, void *data)
1231 {
1232         struct c4iw_qp *qp = p;
1233
1234         t4_disable_wq_db(&qp->wq);
1235         return 0;
1236 }
1237
1238 static void stop_queues(struct uld_ctx *ctx)
1239 {
1240         unsigned long flags;
1241
1242         spin_lock_irqsave(&ctx->dev->lock, flags);
1243         ctx->dev->rdev.stats.db_state_transitions++;
1244         ctx->dev->db_state = STOPPED;
1245         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1246                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1247         else
1248                 ctx->dev->rdev.status_page->db_off = 1;
1249         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1250 }
1251
1252 static int enable_qp_db(int id, void *p, void *data)
1253 {
1254         struct c4iw_qp *qp = p;
1255
1256         t4_enable_wq_db(&qp->wq);
1257         return 0;
1258 }
1259
1260 static void resume_rc_qp(struct c4iw_qp *qp)
1261 {
1262         spin_lock(&qp->lock);
1263         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1264         qp->wq.sq.wq_pidx_inc = 0;
1265         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1266         qp->wq.rq.wq_pidx_inc = 0;
1267         spin_unlock(&qp->lock);
1268 }
1269
1270 static void resume_a_chunk(struct uld_ctx *ctx)
1271 {
1272         int i;
1273         struct c4iw_qp *qp;
1274
1275         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1276                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1277                                       db_fc_entry);
1278                 list_del_init(&qp->db_fc_entry);
1279                 resume_rc_qp(qp);
1280                 if (list_empty(&ctx->dev->db_fc_list))
1281                         break;
1282         }
1283 }
1284
1285 static void resume_queues(struct uld_ctx *ctx)
1286 {
1287         spin_lock_irq(&ctx->dev->lock);
1288         if (ctx->dev->db_state != STOPPED)
1289                 goto out;
1290         ctx->dev->db_state = FLOW_CONTROL;
1291         while (1) {
1292                 if (list_empty(&ctx->dev->db_fc_list)) {
1293                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1294                         ctx->dev->db_state = NORMAL;
1295                         ctx->dev->rdev.stats.db_state_transitions++;
1296                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1297                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1298                                              NULL);
1299                         } else {
1300                                 ctx->dev->rdev.status_page->db_off = 0;
1301                         }
1302                         break;
1303                 } else {
1304                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1305                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1306                                DB_FC_DRAIN_THRESH)) {
1307                                 resume_a_chunk(ctx);
1308                         }
1309                         if (!list_empty(&ctx->dev->db_fc_list)) {
1310                                 spin_unlock_irq(&ctx->dev->lock);
1311                                 if (DB_FC_RESUME_DELAY) {
1312                                         set_current_state(TASK_UNINTERRUPTIBLE);
1313                                         schedule_timeout(DB_FC_RESUME_DELAY);
1314                                 }
1315                                 spin_lock_irq(&ctx->dev->lock);
1316                                 if (ctx->dev->db_state != FLOW_CONTROL)
1317                                         break;
1318                         }
1319                 }
1320         }
1321 out:
1322         if (ctx->dev->db_state != NORMAL)
1323                 ctx->dev->rdev.stats.db_fc_interruptions++;
1324         spin_unlock_irq(&ctx->dev->lock);
1325 }
1326
1327 struct qp_list {
1328         unsigned idx;
1329         struct c4iw_qp **qps;
1330 };
1331
1332 static int add_and_ref_qp(int id, void *p, void *data)
1333 {
1334         struct qp_list *qp_listp = data;
1335         struct c4iw_qp *qp = p;
1336
1337         c4iw_qp_add_ref(&qp->ibqp);
1338         qp_listp->qps[qp_listp->idx++] = qp;
1339         return 0;
1340 }
1341
1342 static int count_qps(int id, void *p, void *data)
1343 {
1344         unsigned *countp = data;
1345         (*countp)++;
1346         return 0;
1347 }
1348
1349 static void deref_qps(struct qp_list *qp_list)
1350 {
1351         int idx;
1352
1353         for (idx = 0; idx < qp_list->idx; idx++)
1354                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1355 }
1356
1357 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1358 {
1359         int idx;
1360         int ret;
1361
1362         for (idx = 0; idx < qp_list->idx; idx++) {
1363                 struct c4iw_qp *qp = qp_list->qps[idx];
1364
1365                 spin_lock_irq(&qp->rhp->lock);
1366                 spin_lock(&qp->lock);
1367                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1368                                           qp->wq.sq.qid,
1369                                           t4_sq_host_wq_pidx(&qp->wq),
1370                                           t4_sq_wq_size(&qp->wq));
1371                 if (ret) {
1372                         pr_err(MOD "%s: Fatal error - "
1373                                "DB overflow recovery failed - "
1374                                "error syncing SQ qid %u\n",
1375                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1376                         spin_unlock(&qp->lock);
1377                         spin_unlock_irq(&qp->rhp->lock);
1378                         return;
1379                 }
1380                 qp->wq.sq.wq_pidx_inc = 0;
1381
1382                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1383                                           qp->wq.rq.qid,
1384                                           t4_rq_host_wq_pidx(&qp->wq),
1385                                           t4_rq_wq_size(&qp->wq));
1386
1387                 if (ret) {
1388                         pr_err(MOD "%s: Fatal error - "
1389                                "DB overflow recovery failed - "
1390                                "error syncing RQ qid %u\n",
1391                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1392                         spin_unlock(&qp->lock);
1393                         spin_unlock_irq(&qp->rhp->lock);
1394                         return;
1395                 }
1396                 qp->wq.rq.wq_pidx_inc = 0;
1397                 spin_unlock(&qp->lock);
1398                 spin_unlock_irq(&qp->rhp->lock);
1399
1400                 /* Wait for the dbfifo to drain */
1401                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1402                         set_current_state(TASK_UNINTERRUPTIBLE);
1403                         schedule_timeout(usecs_to_jiffies(10));
1404                 }
1405         }
1406 }
1407
1408 static void recover_queues(struct uld_ctx *ctx)
1409 {
1410         int count = 0;
1411         struct qp_list qp_list;
1412         int ret;
1413
1414         /* slow everybody down */
1415         set_current_state(TASK_UNINTERRUPTIBLE);
1416         schedule_timeout(usecs_to_jiffies(1000));
1417
1418         /* flush the SGE contexts */
1419         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1420         if (ret) {
1421                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1422                        pci_name(ctx->lldi.pdev));
1423                 return;
1424         }
1425
1426         /* Count active queues so we can build a list of queues to recover */
1427         spin_lock_irq(&ctx->dev->lock);
1428         WARN_ON(ctx->dev->db_state != STOPPED);
1429         ctx->dev->db_state = RECOVERY;
1430         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1431
1432         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1433         if (!qp_list.qps) {
1434                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1435                        pci_name(ctx->lldi.pdev));
1436                 spin_unlock_irq(&ctx->dev->lock);
1437                 return;
1438         }
1439         qp_list.idx = 0;
1440
1441         /* add and ref each qp so it doesn't get freed */
1442         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1443
1444         spin_unlock_irq(&ctx->dev->lock);
1445
1446         /* now traverse the list in a safe context to recover the db state*/
1447         recover_lost_dbs(ctx, &qp_list);
1448
1449         /* we're almost done!  deref the qps and clean up */
1450         deref_qps(&qp_list);
1451         kfree(qp_list.qps);
1452
1453         spin_lock_irq(&ctx->dev->lock);
1454         WARN_ON(ctx->dev->db_state != RECOVERY);
1455         ctx->dev->db_state = STOPPED;
1456         spin_unlock_irq(&ctx->dev->lock);
1457 }
1458
1459 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1460 {
1461         struct uld_ctx *ctx = handle;
1462
1463         switch (control) {
1464         case CXGB4_CONTROL_DB_FULL:
1465                 stop_queues(ctx);
1466                 ctx->dev->rdev.stats.db_full++;
1467                 break;
1468         case CXGB4_CONTROL_DB_EMPTY:
1469                 resume_queues(ctx);
1470                 mutex_lock(&ctx->dev->rdev.stats.lock);
1471                 ctx->dev->rdev.stats.db_empty++;
1472                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1473                 break;
1474         case CXGB4_CONTROL_DB_DROP:
1475                 recover_queues(ctx);
1476                 mutex_lock(&ctx->dev->rdev.stats.lock);
1477                 ctx->dev->rdev.stats.db_drop++;
1478                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1479                 break;
1480         default:
1481                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1482                        pci_name(ctx->lldi.pdev), control);
1483                 break;
1484         }
1485         return 0;
1486 }
1487
1488 static struct cxgb4_uld_info c4iw_uld_info = {
1489         .name = DRV_NAME,
1490         .add = c4iw_uld_add,
1491         .rx_handler = c4iw_uld_rx_handler,
1492         .state_change = c4iw_uld_state_change,
1493         .control = c4iw_uld_control,
1494 };
1495
1496 static int __init c4iw_init_module(void)
1497 {
1498         int err;
1499
1500         err = c4iw_cm_init();
1501         if (err)
1502                 return err;
1503
1504         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1505         if (!c4iw_debugfs_root)
1506                 printk(KERN_WARNING MOD
1507                        "could not create debugfs entry, continuing\n");
1508
1509         if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1510                             c4iw_nl_cb_table))
1511                 pr_err("%s[%u]: Failed to add netlink callback\n"
1512                        , __func__, __LINE__);
1513
1514         err = iwpm_init(RDMA_NL_C4IW);
1515         if (err) {
1516                 pr_err("port mapper initialization failed with %d\n", err);
1517                 ibnl_remove_client(RDMA_NL_C4IW);
1518                 c4iw_cm_term();
1519                 debugfs_remove_recursive(c4iw_debugfs_root);
1520                 return err;
1521         }
1522
1523         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1524
1525         return 0;
1526 }
1527
1528 static void __exit c4iw_exit_module(void)
1529 {
1530         struct uld_ctx *ctx, *tmp;
1531
1532         mutex_lock(&dev_mutex);
1533         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1534                 if (ctx->dev)
1535                         c4iw_remove(ctx);
1536                 kfree(ctx);
1537         }
1538         mutex_unlock(&dev_mutex);
1539         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1540         iwpm_exit(RDMA_NL_C4IW);
1541         ibnl_remove_client(RDMA_NL_C4IW);
1542         c4iw_cm_term();
1543         debugfs_remove_recursive(c4iw_debugfs_root);
1544 }
1545
1546 module_init(c4iw_init_module);
1547 module_exit(c4iw_exit_module);