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                       FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 384                       FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 385                       FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 386                       FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 387                       FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 388                       FW_RI_TPTE_PS_G(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 * 240;
 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         if (!devp->debugfs_root)
 704                 return -1;
 705
 706         debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 707                                  (void *)devp, &qp_debugfs_fops, 4096);
 708
 709         debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 710                                  (void *)devp, &stag_debugfs_fops, 4096);
 711
 712         debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 713                                  (void *)devp, &stats_debugfs_fops, 4096);
 714
 715         debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 716                                  (void *)devp, &ep_debugfs_fops, 4096);
 717
 718         if (c4iw_wr_log)
 719                 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 720                                          (void *)devp, &wr_log_debugfs_fops, 4096);
 721         return 0;
 722 }
 723
 724 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 725                                struct c4iw_dev_ucontext *uctx)
 726 {
 727         struct list_head *pos, *nxt;
 728         struct c4iw_qid_list *entry;
 729
 730         mutex_lock(&uctx->lock);
 731         list_for_each_safe(pos, nxt, &uctx->qpids) {
 732                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 733                 list_del_init(&entry->entry);
 734                 if (!(entry->qid & rdev->qpmask)) {
 735                         c4iw_put_resource(&rdev->resource.qid_table,
 736                                           entry->qid);
 737                         mutex_lock(&rdev->stats.lock);
 738                         rdev->stats.qid.cur -= rdev->qpmask + 1;
 739                         mutex_unlock(&rdev->stats.lock);
 740                 }
 741                 kfree(entry);
 742         }
 743
 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                 kfree(entry);
 748         }
 749         mutex_unlock(&uctx->lock);
 750 }
 751
 752 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 753                             struct c4iw_dev_ucontext *uctx)
 754 {
 755         INIT_LIST_HEAD(&uctx->qpids);
 756         INIT_LIST_HEAD(&uctx->cqids);
 757         mutex_init(&uctx->lock);
 758 }
 759
 760 /* Caller takes care of locking if needed */
 761 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 762 {
 763         int err;
 764
 765         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 766
 767         /*
 768          * qpshift is the number of bits to shift the qpid left in order
 769          * to get the correct address of the doorbell for that qp.
 770          */
 771         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 772         rdev->qpmask = rdev->lldi.udb_density - 1;
 773         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 774         rdev->cqmask = rdev->lldi.ucq_density - 1;
 775         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 776              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 777              "qp qid start %u size %u cq qid start %u size %u\n",
 778              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 779              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 780              rdev->lldi.vr->pbl.start,
 781              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 782              rdev->lldi.vr->rq.size,
 783              rdev->lldi.vr->qp.start,
 784              rdev->lldi.vr->qp.size,
 785              rdev->lldi.vr->cq.start,
 786              rdev->lldi.vr->cq.size);
 787         PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 788              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 789              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 790              (u64)pci_resource_start(rdev->lldi.pdev, 2),
 791              rdev->lldi.db_reg,
 792              rdev->lldi.gts_reg,
 793              rdev->qpshift, rdev->qpmask,
 794              rdev->cqshift, rdev->cqmask);
 795
 796         if (c4iw_num_stags(rdev) == 0) {
 797                 err = -EINVAL;
 798                 goto err1;
 799         }
 800
 801         rdev->stats.pd.total = T4_MAX_NUM_PD;
 802         rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 803         rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 804         rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 805         rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 806         rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 807
 808         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 809         if (err) {
 810                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 811                 goto err1;
 812         }
 813         err = c4iw_pblpool_create(rdev);
 814         if (err) {
 815                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 816                 goto err2;
 817         }
 818         err = c4iw_rqtpool_create(rdev);
 819         if (err) {
 820                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 821                 goto err3;
 822         }
 823         err = c4iw_ocqp_pool_create(rdev);
 824         if (err) {
 825                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 826                 goto err4;
 827         }
 828         rdev->status_page = (struct t4_dev_status_page *)
 829                             __get_free_page(GFP_KERNEL);
 830         if (!rdev->status_page) {
 831                 pr_err(MOD "error allocating status page\n");
 832                 goto err4;
 833         }
 834
 835         if (c4iw_wr_log) {
 836                 rdev->wr_log = kzalloc((1 << c4iw_wr_log_size_order) *
 837                                        sizeof(*rdev->wr_log), GFP_KERNEL);
 838                 if (rdev->wr_log) {
 839                         rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 840                         atomic_set(&rdev->wr_log_idx, 0);
 841                 } else {
 842                         pr_err(MOD "error allocating wr_log. Logging disabled\n");
 843                 }
 844         }
 845
 846         rdev->status_page->db_off = 0;
 847
 848         return 0;
 849 err4:
 850         c4iw_rqtpool_destroy(rdev);
 851 err3:
 852         c4iw_pblpool_destroy(rdev);
 853 err2:
 854         c4iw_destroy_resource(&rdev->resource);
 855 err1:
 856         return err;
 857 }
 858
 859 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 860 {
 861         kfree(rdev->wr_log);
 862         free_page((unsigned long)rdev->status_page);
 863         c4iw_pblpool_destroy(rdev);
 864         c4iw_rqtpool_destroy(rdev);
 865         c4iw_destroy_resource(&rdev->resource);
 866 }
 867
 868 static void c4iw_dealloc(struct uld_ctx *ctx)
 869 {
 870         c4iw_rdev_close(&ctx->dev->rdev);
 871         idr_destroy(&ctx->dev->cqidr);
 872         idr_destroy(&ctx->dev->qpidr);
 873         idr_destroy(&ctx->dev->mmidr);
 874         idr_destroy(&ctx->dev->hwtid_idr);
 875         idr_destroy(&ctx->dev->stid_idr);
 876         idr_destroy(&ctx->dev->atid_idr);
 877         if (ctx->dev->rdev.bar2_kva)
 878                 iounmap(ctx->dev->rdev.bar2_kva);
 879         if (ctx->dev->rdev.oc_mw_kva)
 880                 iounmap(ctx->dev->rdev.oc_mw_kva);
 881         ib_dealloc_device(&ctx->dev->ibdev);
 882         ctx->dev = NULL;
 883 }
 884
 885 static void c4iw_remove(struct uld_ctx *ctx)
 886 {
 887         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 888         c4iw_unregister_device(ctx->dev);
 889         c4iw_dealloc(ctx);
 890 }
 891
 892 static int rdma_supported(const struct cxgb4_lld_info *infop)
 893 {
 894         return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 895                infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 896                infop->vr->cq.size > 0;
 897 }
 898
 899 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 900 {
 901         struct c4iw_dev *devp;
 902         int ret;
 903
 904         if (!rdma_supported(infop)) {
 905                 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
 906                        pci_name(infop->pdev));
 907                 return ERR_PTR(-ENOSYS);
 908         }
 909         if (!ocqp_supported(infop))
 910                 pr_info("%s: On-Chip Queues not supported on this device.\n",
 911                         pci_name(infop->pdev));
 912
 913         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 914         if (!devp) {
 915                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 916                 return ERR_PTR(-ENOMEM);
 917         }
 918         devp->rdev.lldi = *infop;
 919
 920         /* init various hw-queue params based on lld info */
 921         PDBG("%s: Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 922              __func__, devp->rdev.lldi.sge_ingpadboundary,
 923              devp->rdev.lldi.sge_egrstatuspagesize);
 924
 925         devp->rdev.hw_queue.t4_eq_status_entries =
 926                 devp->rdev.lldi.sge_ingpadboundary > 64 ? 2 : 1;
 927         devp->rdev.hw_queue.t4_max_eq_size = 65520;
 928         devp->rdev.hw_queue.t4_max_iq_size = 65520;
 929         devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 930                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 931         devp->rdev.hw_queue.t4_max_sq_size =
 932                 devp->rdev.hw_queue.t4_max_eq_size -
 933                 devp->rdev.hw_queue.t4_eq_status_entries - 1;
 934         devp->rdev.hw_queue.t4_max_qp_depth =
 935                 devp->rdev.hw_queue.t4_max_rq_size;
 936         devp->rdev.hw_queue.t4_max_cq_depth =
 937                 devp->rdev.hw_queue.t4_max_iq_size - 2;
 938         devp->rdev.hw_queue.t4_stat_len =
 939                 devp->rdev.lldi.sge_egrstatuspagesize;
 940
 941         /*
 942          * For T5 devices, we map all of BAR2 with WC.
 943          * For T4 devices with onchip qp mem, we map only that part
 944          * of BAR2 with WC.
 945          */
 946         devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
 947         if (is_t5(devp->rdev.lldi.adapter_type)) {
 948                 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
 949                         pci_resource_len(devp->rdev.lldi.pdev, 2));
 950                 if (!devp->rdev.bar2_kva) {
 951                         pr_err(MOD "Unable to ioremap BAR2\n");
 952                         ib_dealloc_device(&devp->ibdev);
 953                         return ERR_PTR(-EINVAL);
 954                 }
 955         } else if (ocqp_supported(infop)) {
 956                 devp->rdev.oc_mw_pa =
 957                         pci_resource_start(devp->rdev.lldi.pdev, 2) +
 958                         pci_resource_len(devp->rdev.lldi.pdev, 2) -
 959                         roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
 960                 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 961                         devp->rdev.lldi.vr->ocq.size);
 962                 if (!devp->rdev.oc_mw_kva) {
 963                         pr_err(MOD "Unable to ioremap onchip mem\n");
 964                         ib_dealloc_device(&devp->ibdev);
 965                         return ERR_PTR(-EINVAL);
 966                 }
 967         }
 968
 969         PDBG(KERN_INFO MOD "ocq memory: "
 970                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 971                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 972                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 973
 974         ret = c4iw_rdev_open(&devp->rdev);
 975         if (ret) {
 976                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 977                 ib_dealloc_device(&devp->ibdev);
 978                 return ERR_PTR(ret);
 979         }
 980
 981         idr_init(&devp->cqidr);
 982         idr_init(&devp->qpidr);
 983         idr_init(&devp->mmidr);
 984         idr_init(&devp->hwtid_idr);
 985         idr_init(&devp->stid_idr);
 986         idr_init(&devp->atid_idr);
 987         spin_lock_init(&devp->lock);
 988         mutex_init(&devp->rdev.stats.lock);
 989         mutex_init(&devp->db_mutex);
 990         INIT_LIST_HEAD(&devp->db_fc_list);
 991         devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
 992
 993         if (c4iw_debugfs_root) {
 994                 devp->debugfs_root = debugfs_create_dir(
 995                                         pci_name(devp->rdev.lldi.pdev),
 996                                         c4iw_debugfs_root);
 997                 setup_debugfs(devp);
 998         }
 999
1000
1001         return devp;
1002 }
1003
1004 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1005 {
1006         struct uld_ctx *ctx;
1007         static int vers_printed;
1008         int i;
1009
1010         if (!vers_printed++)
1011                 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1012                         DRV_VERSION);
1013
1014         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
1015         if (!ctx) {
1016                 ctx = ERR_PTR(-ENOMEM);
1017                 goto out;
1018         }
1019         ctx->lldi = *infop;
1020
1021         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1022              __func__, pci_name(ctx->lldi.pdev),
1023              ctx->lldi.nchan, ctx->lldi.nrxq,
1024              ctx->lldi.ntxq, ctx->lldi.nports);
1025
1026         mutex_lock(&dev_mutex);
1027         list_add_tail(&ctx->entry, &uld_ctx_list);
1028         mutex_unlock(&dev_mutex);
1029
1030         for (i = 0; i < ctx->lldi.nrxq; i++)
1031                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1032 out:
1033         return ctx;
1034 }
1035
1036 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1037                                                  const __be64 *rsp,
1038                                                  u32 pktshift)
1039 {
1040         struct sk_buff *skb;
1041
1042         /*
1043          * Allocate space for cpl_pass_accept_req which will be synthesized by
1044          * driver. Once the driver synthesizes the request the skb will go
1045          * through the regular cpl_pass_accept_req processing.
1046          * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1047          * cpl_rx_pkt.
1048          */
1049         skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1050                         sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1051         if (unlikely(!skb))
1052                 return NULL;
1053
1054          __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1055                    sizeof(struct rss_header) - pktshift);
1056
1057         /*
1058          * This skb will contain:
1059          *   rss_header from the rspq descriptor (1 flit)
1060          *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1061          *   space for the difference between the size of an
1062          *      rx_pkt and pass_accept_req cpl (1 flit)
1063          *   the packet data from the gl
1064          */
1065         skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1066                                 sizeof(struct rss_header));
1067         skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1068                                        sizeof(struct cpl_pass_accept_req),
1069                                        gl->va + pktshift,
1070                                        gl->tot_len - pktshift);
1071         return skb;
1072 }
1073
1074 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1075                            const __be64 *rsp)
1076 {
1077         unsigned int opcode = *(u8 *)rsp;
1078         struct sk_buff *skb;
1079
1080         if (opcode != CPL_RX_PKT)
1081                 goto out;
1082
1083         skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1084         if (skb == NULL)
1085                 goto out;
1086
1087         if (c4iw_handlers[opcode] == NULL) {
1088                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1089                        opcode);
1090                 kfree_skb(skb);
1091                 goto out;
1092         }
1093         c4iw_handlers[opcode](dev, skb);
1094         return 1;
1095 out:
1096         return 0;
1097 }
1098
1099 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1100                         const struct pkt_gl *gl)
1101 {
1102         struct uld_ctx *ctx = handle;
1103         struct c4iw_dev *dev = ctx->dev;
1104         struct sk_buff *skb;
1105         u8 opcode;
1106
1107         if (gl == NULL) {
1108                 /* omit RSS and rsp_ctrl at end of descriptor */
1109                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1110
1111                 skb = alloc_skb(256, GFP_ATOMIC);
1112                 if (!skb)
1113                         goto nomem;
1114                 __skb_put(skb, len);
1115                 skb_copy_to_linear_data(skb, &rsp[1], len);
1116         } else if (gl == CXGB4_MSG_AN) {
1117                 const struct rsp_ctrl *rc = (void *)rsp;
1118
1119                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1120                 c4iw_ev_handler(dev, qid);
1121                 return 0;
1122         } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1123                 if (recv_rx_pkt(dev, gl, rsp))
1124                         return 0;
1125
1126                 pr_info("%s: unexpected FL contents at %p, " \
1127                        "RSS %#llx, FL %#llx, len %u\n",
1128                        pci_name(ctx->lldi.pdev), gl->va,
1129                        (unsigned long long)be64_to_cpu(*rsp),
1130                        (unsigned long long)be64_to_cpu(
1131                        *(__force __be64 *)gl->va),
1132                        gl->tot_len);
1133
1134                 return 0;
1135         } else {
1136                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1137                 if (unlikely(!skb))
1138                         goto nomem;
1139         }
1140
1141         opcode = *(u8 *)rsp;
1142         if (c4iw_handlers[opcode]) {
1143                 c4iw_handlers[opcode](dev, skb);
1144         } else {
1145                 pr_info("%s no handler opcode 0x%x...\n", __func__,
1146                        opcode);
1147                 kfree_skb(skb);
1148         }
1149
1150         return 0;
1151 nomem:
1152         return -1;
1153 }
1154
1155 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1156 {
1157         struct uld_ctx *ctx = handle;
1158
1159         PDBG("%s new_state %u\n", __func__, new_state);
1160         switch (new_state) {
1161         case CXGB4_STATE_UP:
1162                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
1163                 if (!ctx->dev) {
1164                         int ret;
1165
1166                         ctx->dev = c4iw_alloc(&ctx->lldi);
1167                         if (IS_ERR(ctx->dev)) {
1168                                 printk(KERN_ERR MOD
1169                                        "%s: initialization failed: %ld\n",
1170                                        pci_name(ctx->lldi.pdev),
1171                                        PTR_ERR(ctx->dev));
1172                                 ctx->dev = NULL;
1173                                 break;
1174                         }
1175                         ret = c4iw_register_device(ctx->dev);
1176                         if (ret) {
1177                                 printk(KERN_ERR MOD
1178                                        "%s: RDMA registration failed: %d\n",
1179                                        pci_name(ctx->lldi.pdev), ret);
1180                                 c4iw_dealloc(ctx);
1181                         }
1182                 }
1183                 break;
1184         case CXGB4_STATE_DOWN:
1185                 printk(KERN_INFO MOD "%s: Down\n",
1186                        pci_name(ctx->lldi.pdev));
1187                 if (ctx->dev)
1188                         c4iw_remove(ctx);
1189                 break;
1190         case CXGB4_STATE_START_RECOVERY:
1191                 printk(KERN_INFO MOD "%s: Fatal Error\n",
1192                        pci_name(ctx->lldi.pdev));
1193                 if (ctx->dev) {
1194                         struct ib_event event;
1195
1196                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1197                         memset(&event, 0, sizeof event);
1198                         event.event  = IB_EVENT_DEVICE_FATAL;
1199                         event.device = &ctx->dev->ibdev;
1200                         ib_dispatch_event(&event);
1201                         c4iw_remove(ctx);
1202                 }
1203                 break;
1204         case CXGB4_STATE_DETACH:
1205                 printk(KERN_INFO MOD "%s: Detach\n",
1206                        pci_name(ctx->lldi.pdev));
1207                 if (ctx->dev)
1208                         c4iw_remove(ctx);
1209                 break;
1210         }
1211         return 0;
1212 }
1213
1214 static int disable_qp_db(int id, void *p, void *data)
1215 {
1216         struct c4iw_qp *qp = p;
1217
1218         t4_disable_wq_db(&qp->wq);
1219         return 0;
1220 }
1221
1222 static void stop_queues(struct uld_ctx *ctx)
1223 {
1224         unsigned long flags;
1225
1226         spin_lock_irqsave(&ctx->dev->lock, flags);
1227         ctx->dev->rdev.stats.db_state_transitions++;
1228         ctx->dev->db_state = STOPPED;
1229         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1230                 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1231         else
1232                 ctx->dev->rdev.status_page->db_off = 1;
1233         spin_unlock_irqrestore(&ctx->dev->lock, flags);
1234 }
1235
1236 static int enable_qp_db(int id, void *p, void *data)
1237 {
1238         struct c4iw_qp *qp = p;
1239
1240         t4_enable_wq_db(&qp->wq);
1241         return 0;
1242 }
1243
1244 static void resume_rc_qp(struct c4iw_qp *qp)
1245 {
1246         spin_lock(&qp->lock);
1247         t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc,
1248                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1249         qp->wq.sq.wq_pidx_inc = 0;
1250         t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
1251                       is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1252         qp->wq.rq.wq_pidx_inc = 0;
1253         spin_unlock(&qp->lock);
1254 }
1255
1256 static void resume_a_chunk(struct uld_ctx *ctx)
1257 {
1258         int i;
1259         struct c4iw_qp *qp;
1260
1261         for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1262                 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1263                                       db_fc_entry);
1264                 list_del_init(&qp->db_fc_entry);
1265                 resume_rc_qp(qp);
1266                 if (list_empty(&ctx->dev->db_fc_list))
1267                         break;
1268         }
1269 }
1270
1271 static void resume_queues(struct uld_ctx *ctx)
1272 {
1273         spin_lock_irq(&ctx->dev->lock);
1274         if (ctx->dev->db_state != STOPPED)
1275                 goto out;
1276         ctx->dev->db_state = FLOW_CONTROL;
1277         while (1) {
1278                 if (list_empty(&ctx->dev->db_fc_list)) {
1279                         WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1280                         ctx->dev->db_state = NORMAL;
1281                         ctx->dev->rdev.stats.db_state_transitions++;
1282                         if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1283                                 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1284                                              NULL);
1285                         } else {
1286                                 ctx->dev->rdev.status_page->db_off = 0;
1287                         }
1288                         break;
1289                 } else {
1290                         if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1291                             < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1292                                DB_FC_DRAIN_THRESH)) {
1293                                 resume_a_chunk(ctx);
1294                         }
1295                         if (!list_empty(&ctx->dev->db_fc_list)) {
1296                                 spin_unlock_irq(&ctx->dev->lock);
1297                                 if (DB_FC_RESUME_DELAY) {
1298                                         set_current_state(TASK_UNINTERRUPTIBLE);
1299                                         schedule_timeout(DB_FC_RESUME_DELAY);
1300                                 }
1301                                 spin_lock_irq(&ctx->dev->lock);
1302                                 if (ctx->dev->db_state != FLOW_CONTROL)
1303                                         break;
1304                         }
1305                 }
1306         }
1307 out:
1308         if (ctx->dev->db_state != NORMAL)
1309                 ctx->dev->rdev.stats.db_fc_interruptions++;
1310         spin_unlock_irq(&ctx->dev->lock);
1311 }
1312
1313 struct qp_list {
1314         unsigned idx;
1315         struct c4iw_qp **qps;
1316 };
1317
1318 static int add_and_ref_qp(int id, void *p, void *data)
1319 {
1320         struct qp_list *qp_listp = data;
1321         struct c4iw_qp *qp = p;
1322
1323         c4iw_qp_add_ref(&qp->ibqp);
1324         qp_listp->qps[qp_listp->idx++] = qp;
1325         return 0;
1326 }
1327
1328 static int count_qps(int id, void *p, void *data)
1329 {
1330         unsigned *countp = data;
1331         (*countp)++;
1332         return 0;
1333 }
1334
1335 static void deref_qps(struct qp_list *qp_list)
1336 {
1337         int idx;
1338
1339         for (idx = 0; idx < qp_list->idx; idx++)
1340                 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1341 }
1342
1343 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1344 {
1345         int idx;
1346         int ret;
1347
1348         for (idx = 0; idx < qp_list->idx; idx++) {
1349                 struct c4iw_qp *qp = qp_list->qps[idx];
1350
1351                 spin_lock_irq(&qp->rhp->lock);
1352                 spin_lock(&qp->lock);
1353                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1354                                           qp->wq.sq.qid,
1355                                           t4_sq_host_wq_pidx(&qp->wq),
1356                                           t4_sq_wq_size(&qp->wq));
1357                 if (ret) {
1358                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1359                                "DB overflow recovery failed - "
1360                                "error syncing SQ qid %u\n",
1361                                pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1362                         spin_unlock(&qp->lock);
1363                         spin_unlock_irq(&qp->rhp->lock);
1364                         return;
1365                 }
1366                 qp->wq.sq.wq_pidx_inc = 0;
1367
1368                 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1369                                           qp->wq.rq.qid,
1370                                           t4_rq_host_wq_pidx(&qp->wq),
1371                                           t4_rq_wq_size(&qp->wq));
1372
1373                 if (ret) {
1374                         pr_err(KERN_ERR MOD "%s: Fatal error - "
1375                                "DB overflow recovery failed - "
1376                                "error syncing RQ qid %u\n",
1377                                pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1378                         spin_unlock(&qp->lock);
1379                         spin_unlock_irq(&qp->rhp->lock);
1380                         return;
1381                 }
1382                 qp->wq.rq.wq_pidx_inc = 0;
1383                 spin_unlock(&qp->lock);
1384                 spin_unlock_irq(&qp->rhp->lock);
1385
1386                 /* Wait for the dbfifo to drain */
1387                 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1388                         set_current_state(TASK_UNINTERRUPTIBLE);
1389                         schedule_timeout(usecs_to_jiffies(10));
1390                 }
1391         }
1392 }
1393
1394 static void recover_queues(struct uld_ctx *ctx)
1395 {
1396         int count = 0;
1397         struct qp_list qp_list;
1398         int ret;
1399
1400         /* slow everybody down */
1401         set_current_state(TASK_UNINTERRUPTIBLE);
1402         schedule_timeout(usecs_to_jiffies(1000));
1403
1404         /* flush the SGE contexts */
1405         ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1406         if (ret) {
1407                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1408                        pci_name(ctx->lldi.pdev));
1409                 return;
1410         }
1411
1412         /* Count active queues so we can build a list of queues to recover */
1413         spin_lock_irq(&ctx->dev->lock);
1414         WARN_ON(ctx->dev->db_state != STOPPED);
1415         ctx->dev->db_state = RECOVERY;
1416         idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1417
1418         qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1419         if (!qp_list.qps) {
1420                 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1421                        pci_name(ctx->lldi.pdev));
1422                 spin_unlock_irq(&ctx->dev->lock);
1423                 return;
1424         }
1425         qp_list.idx = 0;
1426
1427         /* add and ref each qp so it doesn't get freed */
1428         idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1429
1430         spin_unlock_irq(&ctx->dev->lock);
1431
1432         /* now traverse the list in a safe context to recover the db state*/
1433         recover_lost_dbs(ctx, &qp_list);
1434
1435         /* we're almost done!  deref the qps and clean up */
1436         deref_qps(&qp_list);
1437         kfree(qp_list.qps);
1438
1439         spin_lock_irq(&ctx->dev->lock);
1440         WARN_ON(ctx->dev->db_state != RECOVERY);
1441         ctx->dev->db_state = STOPPED;
1442         spin_unlock_irq(&ctx->dev->lock);
1443 }
1444
1445 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1446 {
1447         struct uld_ctx *ctx = handle;
1448
1449         switch (control) {
1450         case CXGB4_CONTROL_DB_FULL:
1451                 stop_queues(ctx);
1452                 ctx->dev->rdev.stats.db_full++;
1453                 break;
1454         case CXGB4_CONTROL_DB_EMPTY:
1455                 resume_queues(ctx);
1456                 mutex_lock(&ctx->dev->rdev.stats.lock);
1457                 ctx->dev->rdev.stats.db_empty++;
1458                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1459                 break;
1460         case CXGB4_CONTROL_DB_DROP:
1461                 recover_queues(ctx);
1462                 mutex_lock(&ctx->dev->rdev.stats.lock);
1463                 ctx->dev->rdev.stats.db_drop++;
1464                 mutex_unlock(&ctx->dev->rdev.stats.lock);
1465                 break;
1466         default:
1467                 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1468                        pci_name(ctx->lldi.pdev), control);
1469                 break;
1470         }
1471         return 0;
1472 }
1473
1474 static struct cxgb4_uld_info c4iw_uld_info = {
1475         .name = DRV_NAME,
1476         .add = c4iw_uld_add,
1477         .rx_handler = c4iw_uld_rx_handler,
1478         .state_change = c4iw_uld_state_change,
1479         .control = c4iw_uld_control,
1480 };
1481
1482 static int __init c4iw_init_module(void)
1483 {
1484         int err;
1485
1486         err = c4iw_cm_init();
1487         if (err)
1488                 return err;
1489
1490         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1491         if (!c4iw_debugfs_root)
1492                 printk(KERN_WARNING MOD
1493                        "could not create debugfs entry, continuing\n");
1494
1495         if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1496                             c4iw_nl_cb_table))
1497                 pr_err("%s[%u]: Failed to add netlink callback\n"
1498                        , __func__, __LINE__);
1499
1500         err = iwpm_init(RDMA_NL_C4IW);
1501         if (err) {
1502                 pr_err("port mapper initialization failed with %d\n", err);
1503                 ibnl_remove_client(RDMA_NL_C4IW);
1504                 c4iw_cm_term();
1505                 debugfs_remove_recursive(c4iw_debugfs_root);
1506                 return err;
1507         }
1508
1509         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1510
1511         return 0;
1512 }
1513
1514 static void __exit c4iw_exit_module(void)
1515 {
1516         struct uld_ctx *ctx, *tmp;
1517
1518         mutex_lock(&dev_mutex);
1519         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1520                 if (ctx->dev)
1521                         c4iw_remove(ctx);
1522                 kfree(ctx);
1523         }
1524         mutex_unlock(&dev_mutex);
1525         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1526         iwpm_exit(RDMA_NL_C4IW);
1527         ibnl_remove_client(RDMA_NL_C4IW);
1528         c4iw_cm_term();
1529         debugfs_remove_recursive(c4iw_debugfs_root);
1530 }
1531
1532 module_init(c4iw_init_module);
1533 module_exit(c4iw_exit_module);