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_MAPINFO] = {.dump = iwpm_mapping_info_cb},
  97         [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
  98 };
  99
 100 static int count_idrs(int id, void *p, void *data)
 101 {
 102         int *countp = data;
 103
 104         *countp = *countp + 1;
 105         return 0;
 106 }
 107
 108 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
 109                             loff_t *ppos)
 110 {
 111         struct c4iw_debugfs_data *d = file->private_data;
 112
 113         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
 114 }
 115
 116 void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
 117 {
 118         struct wr_log_entry le;
 119         int idx;
 120
 121         if (!wq->rdev->wr_log)
 122                 return;
 123
 124         idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
 125                 (wq->rdev->wr_log_size - 1);
 126         le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
 127         getnstimeofday(&le.poll_host_ts);
 128         le.valid = 1;
 129         le.cqe_sge_ts = CQE_TS(cqe);
 130         if (SQ_TYPE(cqe)) {
 131                 le.qid = wq->sq.qid;
 132                 le.opcode = CQE_OPCODE(cqe);
 133                 le.post_host_ts = wq->sq.sw_sq[wq->sq.cidx].host_ts;
 134                 le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
 135                 le.wr_id = CQE_WRID_SQ_IDX(cqe);
 136         } else {
 137                 le.qid = wq->rq.qid;
 138                 le.opcode = FW_RI_RECEIVE;
 139                 le.post_host_ts = wq->rq.sw_rq[wq->rq.cidx].host_ts;
 140                 le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
 141                 le.wr_id = CQE_WRID_MSN(cqe);
 142         }
 143         wq->rdev->wr_log[idx] = le;
 144 }
 145
 146 static int wr_log_show(struct seq_file *seq, void *v)
 147 {
 148         struct c4iw_dev *dev = seq->private;
 149         struct timespec prev_ts = {0, 0};
 150         struct wr_log_entry *lep;
 151         int prev_ts_set = 0;
 152         int idx, end;
 153
 154 #define ts2ns(ts) div64_ul((ts) * dev->rdev.lldi.cclk_ps, 1000)
 155
 156         idx = atomic_read(&dev->rdev.wr_log_idx) &
 157                 (dev->rdev.wr_log_size - 1);
 158         end = idx - 1;
 159         if (end < 0)
 160                 end = dev->rdev.wr_log_size - 1;
 161         lep = &dev->rdev.wr_log[idx];
 162         while (idx != end) {
 163                 if (lep->valid) {
 164                         if (!prev_ts_set) {
 165                                 prev_ts_set = 1;
 166                                 prev_ts = lep->poll_host_ts;
 167                         }
 168                         seq_printf(seq, "%04u: sec %lu nsec %lu qid %u opcode "
 169                                    "%u %s 0x%x host_wr_delta sec %lu nsec %lu "
 170                                    "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
 171                                    "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
 172                                    "cqe_poll_delta_ns %llu\n",
 173                                    idx,
 174                                    timespec_sub(lep->poll_host_ts,
 175                                                 prev_ts).tv_sec,
 176                                    timespec_sub(lep->poll_host_ts,
 177                                                 prev_ts).tv_nsec,
 178                                    lep->qid, lep->opcode,
 179                                    lep->opcode == FW_RI_RECEIVE ?
 180                                                         "msn" : "wrid",
 181                                    lep->wr_id,
 182                                    timespec_sub(lep->poll_host_ts,
 183                                                 lep->post_host_ts).tv_sec,
 184                                    timespec_sub(lep->poll_host_ts,
 185                                                 lep->post_host_ts).tv_nsec,
 186                                    lep->post_sge_ts, lep->cqe_sge_ts,
 187                                    lep->poll_sge_ts,
 188                                    ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
 189                                    ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
 190                         prev_ts = lep->poll_host_ts;
 191                 }
 192                 idx++;
 193                 if (idx > (dev->rdev.wr_log_size - 1))
 194                         idx = 0;
 195                 lep = &dev->rdev.wr_log[idx];
 196         }
 197 #undef ts2ns
 198         return 0;
 199 }
 200
 201 static int wr_log_open(struct inode *inode, struct file *file)
 202 {
 203         return single_open(file, wr_log_show, inode->i_private);
 204 }
 205
 206 static ssize_t wr_log_clear(struct file *file, const char __user *buf,
 207                             size_t count, loff_t *pos)
 208 {
 209         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 210         int i;
 211
 212         if (dev->rdev.wr_log)
 213                 for (i = 0; i < dev->rdev.wr_log_size; i++)
 214                         dev->rdev.wr_log[i].valid = 0;
 215         return count;
 216 }
 217
 218 static const struct file_operations wr_log_debugfs_fops = {
 219         .owner   = THIS_MODULE,
 220         .open    = wr_log_open,
 221         .release = single_release,
 222         .read    = seq_read,
 223         .llseek  = seq_lseek,
 224         .write   = wr_log_clear,
 225 };
 226
 227 static int dump_qp(int id, void *p, void *data)
 228 {
 229         struct c4iw_qp *qp = p;
 230         struct c4iw_debugfs_data *qpd = data;
 231         int space;
 232         int cc;
 233
 234         if (id != qp->wq.sq.qid)
 235                 return 0;
 236
 237         space = qpd->bufsize - qpd->pos - 1;
 238         if (space == 0)
 239                 return 1;
 240
 241         if (qp->ep) {
 242                 if (qp->ep->com.local_addr.ss_family == AF_INET) {
 243                         struct sockaddr_in *lsin = (struct sockaddr_in *)
 244                                 &qp->ep->com.local_addr;
 245                         struct sockaddr_in *rsin = (struct sockaddr_in *)
 246                                 &qp->ep->com.remote_addr;
 247                         struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 248                                 &qp->ep->com.mapped_local_addr;
 249                         struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 250                                 &qp->ep->com.mapped_remote_addr;
 251
 252                         cc = snprintf(qpd->buf + qpd->pos, space,
 253                                       "rc qp sq id %u rq id %u state %u "
 254                                       "onchip %u ep tid %u state %u "
 255                                       "%pI4:%u/%u->%pI4:%u/%u\n",
 256                                       qp->wq.sq.qid, qp->wq.rq.qid,
 257                                       (int)qp->attr.state,
 258                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 259                                       qp->ep->hwtid, (int)qp->ep->com.state,
 260                                       &lsin->sin_addr, ntohs(lsin->sin_port),
 261                                       ntohs(mapped_lsin->sin_port),
 262                                       &rsin->sin_addr, ntohs(rsin->sin_port),
 263                                       ntohs(mapped_rsin->sin_port));
 264                 } else {
 265                         struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 266                                 &qp->ep->com.local_addr;
 267                         struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 268                                 &qp->ep->com.remote_addr;
 269                         struct sockaddr_in6 *mapped_lsin6 =
 270                                 (struct sockaddr_in6 *)
 271                                 &qp->ep->com.mapped_local_addr;
 272                         struct sockaddr_in6 *mapped_rsin6 =
 273                                 (struct sockaddr_in6 *)
 274                                 &qp->ep->com.mapped_remote_addr;
 275
 276                         cc = snprintf(qpd->buf + qpd->pos, space,
 277                                       "rc qp sq id %u rq id %u state %u "
 278                                       "onchip %u ep tid %u state %u "
 279                                       "%pI6:%u/%u->%pI6:%u/%u\n",
 280                                       qp->wq.sq.qid, qp->wq.rq.qid,
 281                                       (int)qp->attr.state,
 282                                       qp->wq.sq.flags & T4_SQ_ONCHIP,
 283                                       qp->ep->hwtid, (int)qp->ep->com.state,
 284                                       &lsin6->sin6_addr,
 285                                       ntohs(lsin6->sin6_port),
 286                                       ntohs(mapped_lsin6->sin6_port),
 287                                       &rsin6->sin6_addr,
 288                                       ntohs(rsin6->sin6_port),
 289                                       ntohs(mapped_rsin6->sin6_port));
 290                 }
 291         } else
 292                 cc = snprintf(qpd->buf + qpd->pos, space,
 293                              "qp sq id %u rq id %u state %u onchip %u\n",
 294                               qp->wq.sq.qid, qp->wq.rq.qid,
 295                               (int)qp->attr.state,
 296                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 297         if (cc < space)
 298                 qpd->pos += cc;
 299         return 0;
 300 }
 301
 302 static int qp_release(struct inode *inode, struct file *file)
 303 {
 304         struct c4iw_debugfs_data *qpd = file->private_data;
 305         if (!qpd) {
 306                 printk(KERN_INFO "%s null qpd?\n", __func__);
 307                 return 0;
 308         }
 309         vfree(qpd->buf);
 310         kfree(qpd);
 311         return 0;
 312 }
 313
 314 static int qp_open(struct inode *inode, struct file *file)
 315 {
 316         struct c4iw_debugfs_data *qpd;
 317         int ret = 0;
 318         int count = 1;
 319
 320         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 321         if (!qpd) {
 322                 ret = -ENOMEM;
 323                 goto out;
 324         }
 325         qpd->devp = inode->i_private;
 326         qpd->pos = 0;
 327
 328         spin_lock_irq(&qpd->devp->lock);
 329         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 330         spin_unlock_irq(&qpd->devp->lock);
 331
 332         qpd->bufsize = count * 128;
 333         qpd->buf = vmalloc(qpd->bufsize);
 334         if (!qpd->buf) {
 335                 ret = -ENOMEM;
 336                 goto err1;
 337         }
 338
 339         spin_lock_irq(&qpd->devp->lock);
 340         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 341         spin_unlock_irq(&qpd->devp->lock);
 342
 343         qpd->buf[qpd->pos++] = 0;
 344         file->private_data = qpd;
 345         goto out;
 346 err1:
 347         kfree(qpd);
 348 out:
 349         return ret;
 350 }
 351
 352 static const struct file_operations qp_debugfs_fops = {
 353         .owner   = THIS_MODULE,
 354         .open    = qp_open,
 355         .release = qp_release,
 356         .read    = debugfs_read,
 357         .llseek  = default_llseek,
 358 };
 359
 360 static int dump_stag(int id, void *p, void *data)
 361 {
 362         struct c4iw_debugfs_data *stagd = data;
 363         int space;
 364         int cc;
 365         struct fw_ri_tpte tpte;
 366         int ret;
 367
 368         space = stagd->bufsize - stagd->pos - 1;
 369         if (space == 0)
 370                 return 1;
 371
 372         ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 373                               (__be32 *)&tpte);
 374         if (ret) {
 375                 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 376                         "%s cxgb4_read_tpte err %d\n", __func__, ret);
 377                 return ret;
 378         }
 379         cc = snprintf(stagd->buf + stagd->pos, space,
 380                       "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 381                       "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 382                       (u32)id<<8,
 383                       G_FW_RI_TPTE_VALID(ntohl(tpte.valid_to_pdid)),
 384                       G_FW_RI_TPTE_STAGKEY(ntohl(tpte.valid_to_pdid)),
 385                       G_FW_RI_TPTE_STAGSTATE(ntohl(tpte.valid_to_pdid)),
 386                       G_FW_RI_TPTE_PDID(ntohl(tpte.valid_to_pdid)),
 387                       G_FW_RI_TPTE_PERM(ntohl(tpte.locread_to_qpid)),
 388                       G_FW_RI_TPTE_PS(ntohl(tpte.locread_to_qpid)),
 389                       ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 390                       ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 391         if (cc < space)
 392                 stagd->pos += cc;
 393         return 0;
 394 }
 395
 396 static int stag_release(struct inode *inode, struct file *file)
 397 {
 398         struct c4iw_debugfs_data *stagd = file->private_data;
 399         if (!stagd) {
 400                 printk(KERN_INFO "%s null stagd?\n", __func__);
 401                 return 0;
 402         }
 403         vfree(stagd->buf);
 404         kfree(stagd);
 405         return 0;
 406 }
 407
 408 static int stag_open(struct inode *inode, struct file *file)
 409 {
 410         struct c4iw_debugfs_data *stagd;
 411         int ret = 0;
 412         int count = 1;
 413
 414         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 415         if (!stagd) {
 416                 ret = -ENOMEM;
 417                 goto out;
 418         }
 419         stagd->devp = inode->i_private;
 420         stagd->pos = 0;
 421
 422         spin_lock_irq(&stagd->devp->lock);
 423         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 424         spin_unlock_irq(&stagd->devp->lock);
 425
 426         stagd->bufsize = count * 256;
 427         stagd->buf = vmalloc(stagd->bufsize);
 428         if (!stagd->buf) {
 429                 ret = -ENOMEM;
 430                 goto err1;
 431         }
 432
 433         spin_lock_irq(&stagd->devp->lock);
 434         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 435         spin_unlock_irq(&stagd->devp->lock);
 436
 437         stagd->buf[stagd->pos++] = 0;
 438         file->private_data = stagd;
 439         goto out;
 440 err1:
 441         kfree(stagd);
 442 out:
 443         return ret;
 444 }
 445
 446 static const struct file_operations stag_debugfs_fops = {
 447         .owner   = THIS_MODULE,
 448         .open    = stag_open,
 449         .release = stag_release,
 450         .read    = debugfs_read,
 451         .llseek  = default_llseek,
 452 };
 453
 454 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 455
 456 static int stats_show(struct seq_file *seq, void *v)
 457 {
 458         struct c4iw_dev *dev = seq->private;
 459
 460         seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 461                    "Max", "Fail");
 462         seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 463                         dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 464                         dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 465         seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 466                         dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 467                         dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 468         seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 469                         dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 470                         dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 471         seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 472                         dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 473                         dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 474         seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 475                         dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 476                         dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 477         seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 478                         dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 479                         dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 480         seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 481         seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 482         seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 483         seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 484                    db_state_str[dev->db_state],
 485                    dev->rdev.stats.db_state_transitions,
 486                    dev->rdev.stats.db_fc_interruptions);
 487         seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 488         seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 489                    dev->rdev.stats.act_ofld_conn_fails);
 490         seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 491                    dev->rdev.stats.pas_ofld_conn_fails);
 492         seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 493         return 0;
 494 }
 495
 496 static int stats_open(struct inode *inode, struct file *file)
 497 {
 498         return single_open(file, stats_show, inode->i_private);
 499 }
 500
 501 static ssize_t stats_clear(struct file *file, const char __user *buf,
 502                 size_t count, loff_t *pos)
 503 {
 504         struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 505
 506         mutex_lock(&dev->rdev.stats.lock);
 507         dev->rdev.stats.pd.max = 0;
 508         dev->rdev.stats.pd.fail = 0;
 509         dev->rdev.stats.qid.max = 0;
 510         dev->rdev.stats.qid.fail = 0;
 511         dev->rdev.stats.stag.max = 0;
 512         dev->rdev.stats.stag.fail = 0;
 513         dev->rdev.stats.pbl.max = 0;
 514         dev->rdev.stats.pbl.fail = 0;
 515         dev->rdev.stats.rqt.max = 0;
 516         dev->rdev.stats.rqt.fail = 0;
 517         dev->rdev.stats.ocqp.max = 0;
 518         dev->rdev.stats.ocqp.fail = 0;
 519         dev->rdev.stats.db_full = 0;
 520         dev->rdev.stats.db_empty = 0;
 521         dev->rdev.stats.db_drop = 0;
 522         dev->rdev.stats.db_state_transitions = 0;
 523         dev->rdev.stats.tcam_full = 0;
 524         dev->rdev.stats.act_ofld_conn_fails = 0;
 525         dev->rdev.stats.pas_ofld_conn_fails = 0;
 526         mutex_unlock(&dev->rdev.stats.lock);
 527         return count;
 528 }
 529
 530 static const struct file_operations stats_debugfs_fops = {
 531         .owner   = THIS_MODULE,
 532         .open    = stats_open,
 533         .release = single_release,
 534         .read    = seq_read,
 535         .llseek  = seq_lseek,
 536         .write   = stats_clear,
 537 };
 538
 539 static int dump_ep(int id, void *p, void *data)
 540 {
 541         struct c4iw_ep *ep = p;
 542         struct c4iw_debugfs_data *epd = data;
 543         int space;
 544         int cc;
 545
 546         space = epd->bufsize - epd->pos - 1;
 547         if (space == 0)
 548                 return 1;
 549
 550         if (ep->com.local_addr.ss_family == AF_INET) {
 551                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 552                         &ep->com.local_addr;
 553                 struct sockaddr_in *rsin = (struct sockaddr_in *)
 554                         &ep->com.remote_addr;
 555                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 556                         &ep->com.mapped_local_addr;
 557                 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
 558                         &ep->com.mapped_remote_addr;
 559
 560                 cc = snprintf(epd->buf + epd->pos, space,
 561                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 562                               "history 0x%lx hwtid %d atid %d "
 563                               "%pI4:%d/%d <-> %pI4:%d/%d\n",
 564                               ep, ep->com.cm_id, ep->com.qp,
 565                               (int)ep->com.state, ep->com.flags,
 566                               ep->com.history, ep->hwtid, ep->atid,
 567                               &lsin->sin_addr, ntohs(lsin->sin_port),
 568                               ntohs(mapped_lsin->sin_port),
 569                               &rsin->sin_addr, ntohs(rsin->sin_port),
 570                               ntohs(mapped_rsin->sin_port));
 571         } else {
 572                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 573                         &ep->com.local_addr;
 574                 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
 575                         &ep->com.remote_addr;
 576                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 577                         &ep->com.mapped_local_addr;
 578                 struct sockaddr_in6 *mapped_rsin6 = (struct sockaddr_in6 *)
 579                         &ep->com.mapped_remote_addr;
 580
 581                 cc = snprintf(epd->buf + epd->pos, space,
 582                               "ep %p cm_id %p qp %p state %d flags 0x%lx "
 583                               "history 0x%lx hwtid %d atid %d "
 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                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 589                               ntohs(mapped_lsin6->sin6_port),
 590                               &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 591                               ntohs(mapped_rsin6->sin6_port));
 592         }
 593         if (cc < space)
 594                 epd->pos += cc;
 595         return 0;
 596 }
 597
 598 static int dump_listen_ep(int id, void *p, void *data)
 599 {
 600         struct c4iw_listen_ep *ep = p;
 601         struct c4iw_debugfs_data *epd = data;
 602         int space;
 603         int cc;
 604
 605         space = epd->bufsize - epd->pos - 1;
 606         if (space == 0)
 607                 return 1;
 608
 609         if (ep->com.local_addr.ss_family == AF_INET) {
 610                 struct sockaddr_in *lsin = (struct sockaddr_in *)
 611                         &ep->com.local_addr;
 612                 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
 613                         &ep->com.mapped_local_addr;
 614
 615                 cc = snprintf(epd->buf + epd->pos, space,
 616                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 617                               "backlog %d %pI4:%d/%d\n",
 618                               ep, ep->com.cm_id, (int)ep->com.state,
 619                               ep->com.flags, ep->stid, ep->backlog,
 620                               &lsin->sin_addr, ntohs(lsin->sin_port),
 621                               ntohs(mapped_lsin->sin_port));
 622         } else {
 623                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 624                         &ep->com.local_addr;
 625                 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
 626                         &ep->com.mapped_local_addr;
 627
 628                 cc = snprintf(epd->buf + epd->pos, space,
 629                               "ep %p cm_id %p state %d flags 0x%lx stid %d "
 630                               "backlog %d %pI6:%d/%d\n",
 631                               ep, ep->com.cm_id, (int)ep->com.state,
 632                               ep->com.flags, ep->stid, ep->backlog,
 633                               &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 634                               ntohs(mapped_lsin6->sin6_port));
 635         }
 636         if (cc < space)
 637                 epd->pos += cc;
 638         return 0;
 639 }
 640
 641 static int ep_release(struct inode *inode, struct file *file)
 642 {
 643         struct c4iw_debugfs_data *epd = file->private_data;
 644         if (!epd) {
 645                 pr_info("%s null qpd?\n", __func__);
 646                 return 0;
 647         }
 648         vfree(epd->buf);
 649         kfree(epd);
 650         return 0;
 651 }
 652
 653 static int ep_open(struct inode *inode, struct file *file)
 654 {
 655         struct c4iw_debugfs_data *epd;
 656         int ret = 0;
 657         int count = 1;
 658
 659         epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 660         if (!epd) {
 661                 ret = -ENOMEM;
 662                 goto out;
 663         }
 664         epd->devp = inode->i_private;
 665         epd->pos = 0;
 666
 667         spin_lock_irq(&epd->devp->lock);
 668         idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
 669         idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
 670         idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
 671         spin_unlock_irq(&epd->devp->lock);
 672
 673         epd->bufsize = count * 160;
 674         epd->buf = vmalloc(epd->bufsize);
 675         if (!epd->buf) {
 676                 ret = -ENOMEM;
 677                 goto err1;
 678         }
 679
 680         spin_lock_irq(&epd->devp->lock);
 681         idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
 682         idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
 683         idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
 684         spin_unlock_irq(&epd->devp->lock);
 685
 686         file->private_data = epd;
 687         goto out;
 688 err1:
 689         kfree(epd);
 690 out:
 691         return ret;
 692 }
 693
 694 static const struct file_operations ep_debugfs_fops = {
 695         .owner   = THIS_MODULE,
 696         .open    = ep_open,
 697         .release = ep_release,
 698         .read    = debugfs_read,
 699 };
 700
 701 static int setup_debugfs(struct c4iw_dev *devp)
 702 {
 703         struct dentry *de;
 704
 705         if (!devp->debugfs_root)
 706                 return -1;
 707
 708         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 709                                  (void *)devp, &qp_debugfs_fops);
 710         if (de && de->d_inode)
 711                 de->d_inode->i_size = 4096;
 712
 713         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 714                                  (void *)devp, &stag_debugfs_fops);
 715         if (de && de->d_inode)
 716                 de->d_inode->i_size = 4096;
 717
 718         de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
 719                         (void *)devp, &stats_debugfs_fops);
 720         if (de && de->d_inode)
 721                 de->d_inode->i_size = 4096;
 722
 723         de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
 724                         (void *)devp, &ep_debugfs_fops);
 725         if (de && de->d_inode)
 726                 de->d_inode->i_size = 4096;
 727
 728         if (c4iw_wr_log) {
 729                 de = debugfs_create_file("wr_log", S_IWUSR, devp->debugfs_root,
 730                                          (void *)devp, &wr_log_debugfs_fops);
 731                 if (de && de->d_inode)
 732                         de->d_inode->i_size = 4096;
 733         }
 734         return 0;
 735 }
 736
 737 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 738                                struct c4iw_dev_ucontext *uctx)
 739 {
 740         struct list_head *pos, *nxt;
 741         struct c4iw_qid_list *entry;
 742
 743         mutex_lock(&uctx->lock);
 744         list_for_each_safe(pos, nxt, &uctx->qpids) {
 745                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 746                 list_del_init(&entry->entry);
 747                 if (!(entry->qid & rdev->qpmask)) {
 748                         c4iw_put_resource(&rdev->resource.qid_table,
 749                                           entry->qid);
 750                         mutex_lock(&rdev->stats.lock);
 751                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 752                         mutex_unlock(&rdev->stats.lock);
 753                 }
 754                 kfree(entry);
 755         }
 756
 757         list_for_each_safe(pos, nxt, &uctx->qpids) {
 758                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 759                 list_del_init(&entry->entry);
 760                 kfree(entry);
 761         }
 762         mutex_unlock(&uctx->lock);
 763 }
 764
 765 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 766                             struct c4iw_dev_ucontext *uctx)
 767 {
 768         INIT_LIST_HEAD(&uctx->qpids);
 769         INIT_LIST_HEAD(&uctx->cqids);
 770         mutex_init(&uctx->lock);
 771 }
 772
 773 /* Caller takes care of locking if needed */
 774 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 775 {
 776         int err;
 777
 778         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 779
 780         /*
 781          * qpshift is the number of bits to shift the qpid left in order
 782          * to get the correct address of the doorbell for that qp.
 783          */
 784         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 785         rdev->qpmask = rdev->lldi.udb_density - 1;
 786         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 787         rdev->cqmask = rdev->lldi.ucq_density - 1;
 788         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 789              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 790              "qp qid start %u size %u cq qid start %u size %u\n",
 791              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 792              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 793              rdev->lldi.vr->pbl.start,
 794              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 795              rdev->lldi.vr->rq.size,
 796              rdev->lldi.vr->qp.start,
 797              rdev->lldi.vr->qp.size,
 798              rdev->lldi.vr->cq.start,
 799              rdev->lldi.vr->cq.size);
 800         PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 801              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 802              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 803              (u64)pci_resource_start(rdev->lldi.pdev, 2),
 804              rdev->lldi.db_reg,
 805              rdev->lldi.gts_reg,
 806              rdev->qpshift, rdev->qpmask,
 807              rdev->cqshift, rdev->cqmask);
 808
 809         if (c4iw_num_stags(rdev) == 0) {
 810                 err = -EINVAL;
 811                 goto err1;
 812         }
 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                 goto err1;
 825         }
 826         err = c4iw_pblpool_create(rdev);
 827         if (err) {
 828                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 829                 goto err2;
 830         }
 831         err = c4iw_rqtpool_create(rdev);
 832         if (err) {
 833                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 834                 goto err3;
 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 err4;
 840         }
 841         rdev->status_page = (struct t4_dev_status_page *)
 842                             __get_free_page(GFP_KERNEL);
 843         if (!rdev->status_page) {
 844                 pr_err(MOD "error allocating status page\n");
 845                 goto err4;
 846         }
 847
 848         if (c4iw_wr_log) {
 849                 rdev->wr_log = kzalloc((1 << c4iw_wr_log_size_order) *
 850                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 851                 if (rdev->wr_log) {
 852                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 853                         atomic_set(&rdev->wr_log_idx, 0);
 854                 } else {
 855                         pr_err(MOD "error allocating wr_log. Logging disabled\n");
 856                 }
 857         }
 858
 859         rdev->status_page->db_off = 0;
 860
 861         return 0;
 862 err4:
 863         c4iw_rqtpool_destroy(rdev);
 864 err3:
 865         c4iw_pblpool_destroy(rdev);
 866 err2:
 867         c4iw_destroy_resource(&rdev->resource);
 868 err1:
 869         return err;
 870 }
 871
 872 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 873 {
 874         kfree(rdev->wr_log);
 875         free_page((unsigned long)rdev->status_page);
 876         c4iw_pblpool_destroy(rdev);
 877         c4iw_rqtpool_destroy(rdev);
 878         c4iw_destroy_resource(&rdev->resource);
 879 }
 880
 881 static void c4iw_dealloc(struct uld_ctx *ctx)
 882 {
 883         c4iw_rdev_close(&ctx->dev->rdev);
 884         idr_destroy(&ctx->dev->cqidr);
 885         idr_destroy(&ctx->dev->qpidr);
 886         idr_destroy(&ctx->dev->mmidr);
 887         idr_destroy(&ctx->dev->hwtid_idr);
 888         idr_destroy(&ctx->dev->stid_idr);
 889         idr_destroy(&ctx->dev->atid_idr);
 890         if (ctx->dev->rdev.bar2_kva)
 891                 iounmap(ctx->dev->rdev.bar2_kva);
 892         if (ctx->dev->rdev.oc_mw_kva)
 893                 iounmap(ctx->dev->rdev.oc_mw_kva);
 894         ib_dealloc_device(&ctx->dev->ibdev);
 895         ctx->dev = NULL;
 896 }
 897
 898 static void c4iw_remove(struct uld_ctx *ctx)
 899 {
 900         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 901         c4iw_unregister_device(ctx->dev);
 902         c4iw_dealloc(ctx);
 903 }
 904
 905 static int rdma_supported(const struct cxgb4_lld_info *infop)
 906 {
 907         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 908                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 909                infop->vr->cq.size > 0;
 910 }
 911
 912 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 913 {
 914         struct c4iw_dev *devp;
 915         int ret;
 916
 917         if (!rdma_supported(infop)) {
 918                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 919                        pci_name(infop->pdev));
 920                 return ERR_PTR(-ENOSYS);
 921         }
 922         if (!ocqp_supported(infop))
 923                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 924                         pci_name(infop->pdev));
 925
 926         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 927         if (!devp) {
 928                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 929                 return ERR_PTR(-ENOMEM);
 930         }
 931         devp->rdev.lldi = *infop;
 932
 933         /* init various hw-queue params based on lld info */
 934         PDBG("%s: Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 935              __func__, devp->rdev.lldi.sge_ingpadboundary,
 936              devp->rdev.lldi.sge_egrstatuspagesize);
 937
 938         devp->rdev.hw_queue.t4_eq_status_entries =
 939                 devp->rdev.lldi.sge_ingpadboundary > 64 ? 2 : 1;
 940         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 941         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 942         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 943                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 944         devp->rdev.hw_queue.t4_max_sq_size =
 945                 devp->rdev.hw_queue.t4_max_eq_size -
 946                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 947         devp->rdev.hw_queue.t4_max_qp_depth =
 948                 devp->rdev.hw_queue.t4_max_rq_size;
 949         devp->rdev.hw_queue.t4_max_cq_depth =
 950                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 951         devp->rdev.hw_queue.t4_stat_len =
 952                 devp->rdev.lldi.sge_egrstatuspagesize;
 953
 954         /*
 955          * For T5 devices, we map all of BAR2 with WC.
 956          * For T4 devices with onchip qp mem, we map only that part
 957          * of BAR2 with WC.
 958          */
 959         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 960         if (is_t5(devp->rdev.lldi.adapter_type)) {
 961                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 962                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 963                 if (!devp->rdev.bar2_kva) {
 964                         pr_err(MOD "Unable to ioremap BAR2\n");
 965                         ib_dealloc_device(&devp->ibdev);
 966                         return ERR_PTR(-EINVAL);
 967                 }
 968         } else if (ocqp_supported(infop)) {
 969                 devp->rdev.oc_mw_pa =
 970                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
 971                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
 972                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
 973                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 974                         devp->rdev.lldi.vr->ocq.size);
 975                 if (!devp->rdev.oc_mw_kva) {
 976                         pr_err(MOD "Unable to ioremap onchip mem\n");
 977                         ib_dealloc_device(&devp->ibdev);
 978                         return ERR_PTR(-EINVAL);
 979                 }
 980         }
 981
 982         PDBG(KERN_INFO MOD "ocq memory: "
 983                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 984                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 985                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 986
 987         ret = c4iw_rdev_open(&devp->rdev);
 988         if (ret) {
 989                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 990                 ib_dealloc_device(&devp->ibdev);
 991                 return ERR_PTR(ret);
 992         }
 993
 994         idr_init(&devp->cqidr);
 995         idr_init(&devp->qpidr);
 996         idr_init(&devp->mmidr);
 997         idr_init(&devp->hwtid_idr);
 998         idr_init(&devp->stid_idr);
 999         idr_init(&devp->atid_idr);
1000         spin_lock_init(&devp->lock);
1001         mutex_init(&devp->rdev.stats.lock);
1002         mutex_init(&devp->db_mutex);
1003         INIT_LIST_HEAD(&devp->db_fc_list);
1004         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1005
1006         if (c4iw_debugfs_root) {
1007                 devp->debugfs_root = debugfs_create_dir(
1008                                         pci_name(devp->rdev.lldi.pdev),
1009                                         c4iw_debugfs_root);
1010                 setup_debugfs(devp);
1011         }
1012
1013
1014         return devp;
1015 }
1016
1017 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1018 {
1019         struct uld_ctx *ctx;
1020         static int vers_printed;
1021         int i;
1022
1023         if (!vers_printed++)
1024                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1025                         DRV_VERSION);
1026
1027         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1028         if (!ctx) {
1029                 ctx = ERR_PTR(-ENOMEM);
1030                 goto out;
1031         }
1032         ctx->lldi = *infop;
1033
1034         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1035              __func__, pci_name(ctx->lldi.pdev),
1036              ctx->lldi.nchan, ctx->lldi.nrxq,
1037              ctx->lldi.ntxq, ctx->lldi.nports);
1038
1039         mutex_lock(&dev_mutex);
1040         list_add_tail(&ctx->entry, &uld_ctx_list);
1041         mutex_unlock(&dev_mutex);
1042
1043         for (i = 0; i < ctx->lldi.nrxq; i++)
1044                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1045 out:
1046         return ctx;
1047 }
1048
1049 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1050                                                  const __be64 *rsp,
1051                                                  u32 pktshift)
1052 {
1053         struct sk_buff *skb;
1054
1055         /*
1056          * Allocate space for cpl_pass_accept_req which will be synthesized by
1057          * driver. Once the driver synthesizes the request the skb will go
1058          * through the regular cpl_pass_accept_req processing.
1059          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1060          * cpl_rx_pkt.
1061          */
1062         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1063                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1064         if (unlikely(!skb))
1065                 return NULL;
1066
1067          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1068                    sizeof(struct rss_header) - pktshift);
1069
1070         /*
1071          * This skb will contain:
1072          *   rss_header from the rspq descriptor (1 flit)
1073          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1074          *   space for the difference between the size of an
1075          *      rx_pkt and pass_accept_req cpl (1 flit)
1076          *   the packet data from the gl
1077          */
1078         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1079                                 sizeof(struct rss_header));
1080         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1081                                        sizeof(struct cpl_pass_accept_req),
1082                                        gl->va + pktshift,
1083                                        gl->tot_len - pktshift);
1084         return skb;
1085 }
1086
1087 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1088                            const __be64 *rsp)
1089 {
1090         unsigned int opcode = *(u8 *)rsp;
1091         struct sk_buff *skb;
1092
1093         if (opcode != CPL_RX_PKT)
1094                 goto out;
1095
1096         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1097         if (skb == NULL)
1098                 goto out;
1099
1100         if (c4iw_handlers[opcode] == NULL) {
1101                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1102                        opcode);
1103                 kfree_skb(skb);
1104                 goto out;
1105         }
1106         c4iw_handlers[opcode](dev, skb);
1107         return 1;
1108 out:
1109         return 0;
1110 }
1111
1112 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1113                         const struct pkt_gl *gl)
1114 {
1115         struct uld_ctx *ctx = handle;
1116         struct c4iw_dev *dev = ctx->dev;
1117         struct sk_buff *skb;
1118         u8 opcode;
1119
1120         if (gl == NULL) {
1121                 /* omit RSS and rsp_ctrl at end of descriptor */
1122                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1123
1124                 skb = alloc_skb(256, GFP_ATOMIC);
1125                 if (!skb)
1126                         goto nomem;
1127                 __skb_put(skb, len);
1128                 skb_copy_to_linear_data(skb, &rsp[1], len);
1129         } else if (gl == CXGB4_MSG_AN) {
1130                 const struct rsp_ctrl *rc = (void *)rsp;
1131
1132                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1133                 c4iw_ev_handler(dev, qid);
1134                 return 0;
1135         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1136                 if (recv_rx_pkt(dev, gl, rsp))
1137                         return 0;
1138
1139                 pr_info("%s: unexpected FL contents at %p, " \
1140                        "RSS %#llx, FL %#llx, len %u\n",
1141                        pci_name(ctx->lldi.pdev), gl->va,
1142                        (unsigned long long)be64_to_cpu(*rsp),
1143                        (unsigned long long)be64_to_cpu(
1144                        *(__force __be64 *)gl->va),
1145                        gl->tot_len);
1146
1147                 return 0;
1148         } else {
1149                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1150                 if (unlikely(!skb))
1151                         goto nomem;
1152         }
1153
1154         opcode = *(u8 *)rsp;
1155         if (c4iw_handlers[opcode]) {
1156                 c4iw_handlers[opcode](dev, skb);
1157         } else {
1158                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1159                        opcode);
1160                 kfree_skb(skb);
1161         }
1162
1163         return 0;
1164 nomem:
1165         return -1;
1166 }
1167
1168 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1169 {
1170         struct uld_ctx *ctx = handle;
1171
1172         PDBG("%s new_state %u\n", __func__, new_state);
1173         switch (new_state) {
1174         case CXGB4_STATE_UP:
1175                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
1176                 if (!ctx->dev) {
1177                         int ret;
1178
1179                         ctx->dev = c4iw_alloc(&ctx->lldi);
1180                         if (IS_ERR(ctx->dev)) {
1181                                 printk(KERN_ERR MOD
1182                                        "%s: initialization failed: %ld\n",
1183                                        pci_name(ctx->lldi.pdev),
1184                                        PTR_ERR(ctx->dev));
1185                                 ctx->dev = NULL;
1186                                 break;
1187                         }
1188                         ret = c4iw_register_device(ctx->dev);
1189                         if (ret) {
1190                                 printk(KERN_ERR MOD
1191                                        "%s: RDMA registration failed: %d\n",
1192                                        pci_name(ctx->lldi.pdev), ret);
1193                                 c4iw_dealloc(ctx);
1194                         }
1195                 }
1196                 break;
1197         case CXGB4_STATE_DOWN:
1198                 printk(KERN_INFO MOD "%s: Down\n",
1199                        pci_name(ctx->lldi.pdev));
1200                 if (ctx->dev)
1201                         c4iw_remove(ctx);
1202                 break;
1203         case CXGB4_STATE_START_RECOVERY:
1204                 printk(KERN_INFO MOD "%s: Fatal Error\n",
1205                        pci_name(ctx->lldi.pdev));
1206                 if (ctx->dev) {
1207                         struct ib_event event;
1208
1209                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1210                         memset(&event, 0, sizeof event);
1211                         event.event  = IB_EVENT_DEVICE_FATAL;
1212                         event.device = &ctx->dev->ibdev;
1213                         ib_dispatch_event(&event);
1214                         c4iw_remove(ctx);
1215                 }
1216                 break;
1217         case CXGB4_STATE_DETACH:
1218                 printk(KERN_INFO MOD "%s: Detach\n",
1219                        pci_name(ctx->lldi.pdev));
1220                 if (ctx->dev)
1221                         c4iw_remove(ctx);
1222                 break;
1223         }
1224         return 0;
1225 }
1226
1227 static int disable_qp_db(int id, void *p, void *data)
1228 {
1229         struct c4iw_qp *qp = p;
1230
1231         t4_disable_wq_db(&qp->wq);
1232         return 0;
1233 }
1234
1235 static void stop_queues(struct uld_ctx *ctx)
1236 {
1237         unsigned long flags;
1238
1239         spin_lock_irqsave(&ctx->dev->lock, flags);
1240         ctx->dev->rdev.stats.db_state_transitions++;
1241         ctx->dev->db_state = STOPPED;
1242         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1243                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1244         else
1245                 ctx->dev->rdev.status_page->db_off = 1;
1246         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1247 }
1248
1249 static int enable_qp_db(int id, void *p, void *data)
1250 {
1251         struct c4iw_qp *qp = p;
1252
1253         t4_enable_wq_db(&qp->wq);
1254         return 0;
1255 }
1256
1257 static void resume_rc_qp(struct c4iw_qp *qp)
1258 {
1259         spin_lock(&qp->lock);
1260         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc,
1261                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1262         qp->wq.sq.wq_pidx_inc = 0;
1263         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
1264                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1265         qp->wq.rq.wq_pidx_inc = 0;
1266         spin_unlock(&qp->lock);
1267 }
1268
1269 static void resume_a_chunk(struct uld_ctx *ctx)
1270 {
1271         int i;
1272         struct c4iw_qp *qp;
1273
1274         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1275                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1276                                       db_fc_entry);
1277                 list_del_init(&qp->db_fc_entry);
1278                 resume_rc_qp(qp);
1279                 if (list_empty(&ctx->dev->db_fc_list))
1280                         break;
1281         }
1282 }
1283
1284 static void resume_queues(struct uld_ctx *ctx)
1285 {
1286         spin_lock_irq(&ctx->dev->lock);
1287         if (ctx->dev->db_state != STOPPED)
1288                 goto out;
1289         ctx->dev->db_state = FLOW_CONTROL;
1290         while (1) {
1291                 if (list_empty(&ctx->dev->db_fc_list)) {
1292                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1293                         ctx->dev->db_state = NORMAL;
1294                         ctx->dev->rdev.stats.db_state_transitions++;
1295                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1296                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1297                                              NULL);
1298                         } else {
1299                                 ctx->dev->rdev.status_page->db_off = 0;
1300                         }
1301                         break;
1302                 } else {
1303                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1304                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1305                                DB_FC_DRAIN_THRESH)) {
1306                                 resume_a_chunk(ctx);
1307                         }
1308                         if (!list_empty(&ctx->dev->db_fc_list)) {
1309                                 spin_unlock_irq(&ctx->dev->lock);
1310                                 if (DB_FC_RESUME_DELAY) {
1311                                         set_current_state(TASK_UNINTERRUPTIBLE);
1312                                         schedule_timeout(DB_FC_RESUME_DELAY);
1313                                 }
1314                                 spin_lock_irq(&ctx->dev->lock);
1315                                 if (ctx->dev->db_state != FLOW_CONTROL)
1316                                         break;
1317                         }
1318                 }
1319         }
1320 out:
1321         if (ctx->dev->db_state != NORMAL)
1322                 ctx->dev->rdev.stats.db_fc_interruptions++;
1323         spin_unlock_irq(&ctx->dev->lock);
1324 }
1325
1326 struct qp_list {
1327         unsigned idx;
1328         struct c4iw_qp **qps;
1329 };
1330
1331 static int add_and_ref_qp(int id, void *p, void *data)
1332 {
1333         struct qp_list *qp_listp = data;
1334         struct c4iw_qp *qp = p;
1335
1336         c4iw_qp_add_ref(&qp->ibqp);
1337         qp_listp->qps[qp_listp->idx++] = qp;
1338         return 0;
1339 }
1340
1341 static int count_qps(int id, void *p, void *data)
1342 {
1343         unsigned *countp = data;
1344         (*countp)++;
1345         return 0;
1346 }
1347
1348 static void deref_qps(struct qp_list *qp_list)
1349 {
1350         int idx;
1351
1352         for (idx = 0; idx < qp_list->idx; idx++)
1353                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1354 }
1355
1356 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1357 {
1358         int idx;
1359         int ret;
1360
1361         for (idx = 0; idx < qp_list->idx; idx++) {
1362                 struct c4iw_qp *qp = qp_list->qps[idx];
1363
1364                 spin_lock_irq(&qp->rhp->lock);
1365                 spin_lock(&qp->lock);
1366                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1367                                           qp->wq.sq.qid,
1368                                           t4_sq_host_wq_pidx(&qp->wq),
1369                                           t4_sq_wq_size(&qp->wq));
1370                 if (ret) {
1371                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1372                                "DB overflow recovery failed - "
1373                                "error syncing SQ qid %u\n",
1374                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1375                         spin_unlock(&qp->lock);
1376                         spin_unlock_irq(&qp->rhp->lock);
1377                         return;
1378                 }
1379                 qp->wq.sq.wq_pidx_inc = 0;
1380
1381                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1382                                           qp->wq.rq.qid,
1383                                           t4_rq_host_wq_pidx(&qp->wq),
1384                                           t4_rq_wq_size(&qp->wq));
1385
1386                 if (ret) {
1387                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1388                                "DB overflow recovery failed - "
1389                                "error syncing RQ qid %u\n",
1390                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1391                         spin_unlock(&qp->lock);
1392                         spin_unlock_irq(&qp->rhp->lock);
1393                         return;
1394                 }
1395                 qp->wq.rq.wq_pidx_inc = 0;
1396                 spin_unlock(&qp->lock);
1397                 spin_unlock_irq(&qp->rhp->lock);
1398
1399                 /* Wait for the dbfifo to drain */
1400                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1401                         set_current_state(TASK_UNINTERRUPTIBLE);
1402                         schedule_timeout(usecs_to_jiffies(10));
1403                 }
1404         }
1405 }
1406
1407 static void recover_queues(struct uld_ctx *ctx)
1408 {
1409         int count = 0;
1410         struct qp_list qp_list;
1411         int ret;
1412
1413         /* slow everybody down */
1414         set_current_state(TASK_UNINTERRUPTIBLE);
1415         schedule_timeout(usecs_to_jiffies(1000));
1416
1417         /* flush the SGE contexts */
1418         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1419         if (ret) {
1420                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1421                        pci_name(ctx->lldi.pdev));
1422                 return;
1423         }
1424
1425         /* Count active queues so we can build a list of queues to recover */
1426         spin_lock_irq(&ctx->dev->lock);
1427         WARN_ON(ctx->dev->db_state != STOPPED);
1428         ctx->dev->db_state = RECOVERY;
1429         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1430
1431         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1432         if (!qp_list.qps) {
1433                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1434                        pci_name(ctx->lldi.pdev));
1435                 spin_unlock_irq(&ctx->dev->lock);
1436                 return;
1437         }
1438         qp_list.idx = 0;
1439
1440         /* add and ref each qp so it doesn't get freed */
1441         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1442
1443         spin_unlock_irq(&ctx->dev->lock);
1444
1445         /* now traverse the list in a safe context to recover the db state*/
1446         recover_lost_dbs(ctx, &qp_list);
1447
1448         /* we're almost done!  deref the qps and clean up */
1449         deref_qps(&qp_list);
1450         kfree(qp_list.qps);
1451
1452         spin_lock_irq(&ctx->dev->lock);
1453         WARN_ON(ctx->dev->db_state != RECOVERY);
1454         ctx->dev->db_state = STOPPED;
1455         spin_unlock_irq(&ctx->dev->lock);
1456 }
1457
1458 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1459 {
1460         struct uld_ctx *ctx = handle;
1461
1462         switch (control) {
1463         case CXGB4_CONTROL_DB_FULL:
1464                 stop_queues(ctx);
1465                 ctx->dev->rdev.stats.db_full++;
1466                 break;
1467         case CXGB4_CONTROL_DB_EMPTY:
1468                 resume_queues(ctx);
1469                 mutex_lock(&ctx->dev->rdev.stats.lock);
1470                 ctx->dev->rdev.stats.db_empty++;
1471                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1472                 break;
1473         case CXGB4_CONTROL_DB_DROP:
1474                 recover_queues(ctx);
1475                 mutex_lock(&ctx->dev->rdev.stats.lock);
1476                 ctx->dev->rdev.stats.db_drop++;
1477                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1478                 break;
1479         default:
1480                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1481                        pci_name(ctx->lldi.pdev), control);
1482                 break;
1483         }
1484         return 0;
1485 }
1486
1487 static struct cxgb4_uld_info c4iw_uld_info = {
1488         .name = DRV_NAME,
1489         .add = c4iw_uld_add,
1490         .rx_handler = c4iw_uld_rx_handler,
1491         .state_change = c4iw_uld_state_change,
1492         .control = c4iw_uld_control,
1493 };
1494
1495 static int __init c4iw_init_module(void)
1496 {
1497         int err;
1498
1499         err = c4iw_cm_init();
1500         if (err)
1501                 return err;
1502
1503         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1504         if (!c4iw_debugfs_root)
1505                 printk(KERN_WARNING MOD
1506                        "could not create debugfs entry, continuing\n");
1507
1508         if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1509                             c4iw_nl_cb_table))
1510                 pr_err("%s[%u]: Failed to add netlink callback\n"
1511                        , __func__, __LINE__);
1512
1513         err = iwpm_init(RDMA_NL_C4IW);
1514         if (err) {
1515                 pr_err("port mapper initialization failed with %d\n", err);
1516                 ibnl_remove_client(RDMA_NL_C4IW);
1517                 c4iw_cm_term();
1518                 debugfs_remove_recursive(c4iw_debugfs_root);
1519                 return err;
1520         }
1521
1522         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1523
1524         return 0;
1525 }
1526
1527 static void __exit c4iw_exit_module(void)
1528 {
1529         struct uld_ctx *ctx, *tmp;
1530
1531         mutex_lock(&dev_mutex);
1532         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1533                 if (ctx->dev)
1534                         c4iw_remove(ctx);
1535                 kfree(ctx);
1536         }
1537         mutex_unlock(&dev_mutex);
1538         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1539         iwpm_exit(RDMA_NL_C4IW);
1540         ibnl_remove_client(RDMA_NL_C4IW);
1541         c4iw_cm_term();
1542         debugfs_remove_recursive(c4iw_debugfs_root);
1543 }
1544
1545 module_init(c4iw_init_module);
1546 module_exit(c4iw_exit_module);