linux/drivers/infiniband/hw/cxgb4/device.c
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   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
  44MODULE_AUTHOR("Steve Wise");
  45MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
  46MODULE_LICENSE("Dual BSD/GPL");
  47
  48static int allow_db_fc_on_t5;
  49module_param(allow_db_fc_on_t5, int, 0644);
  50MODULE_PARM_DESC(allow_db_fc_on_t5,
  51                 "Allow DB Flow Control on T5 (default = 0)");
  52
  53static int allow_db_coalescing_on_t5;
  54module_param(allow_db_coalescing_on_t5, int, 0644);
  55MODULE_PARM_DESC(allow_db_coalescing_on_t5,
  56                 "Allow DB Coalescing on T5 (default = 0)");
  57
  58int c4iw_wr_log = 0;
  59module_param(c4iw_wr_log, int, 0444);
  60MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
  61
  62static int c4iw_wr_log_size_order = 12;
  63module_param(c4iw_wr_log_size_order, int, 0444);
  64MODULE_PARM_DESC(c4iw_wr_log_size_order,
  65                 "Number of entries (log2) in the work request timing log.");
  66
  67static LIST_HEAD(uld_ctx_list);
  68static DEFINE_MUTEX(dev_mutex);
  69static struct workqueue_struct *reg_workq;
  70
  71#define DB_FC_RESUME_SIZE 64
  72#define DB_FC_RESUME_DELAY 1
  73#define DB_FC_DRAIN_THRESH 0
  74
  75static struct dentry *c4iw_debugfs_root;
  76
  77struct c4iw_debugfs_data {
  78        struct c4iw_dev *devp;
  79        char *buf;
  80        int bufsize;
  81        int pos;
  82};
  83
  84static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  85                            loff_t *ppos)
  86{
  87        struct c4iw_debugfs_data *d = file->private_data;
  88
  89        return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
  90}
  91
  92void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
  93{
  94        struct wr_log_entry le;
  95        int idx;
  96
  97        if (!wq->rdev->wr_log)
  98                return;
  99
 100        idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
 101                (wq->rdev->wr_log_size - 1);
 102        le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
 103        le.poll_host_time = ktime_get();
 104        le.valid = 1;
 105        le.cqe_sge_ts = CQE_TS(cqe);
 106        if (SQ_TYPE(cqe)) {
 107                le.qid = wq->sq.qid;
 108                le.opcode = CQE_OPCODE(cqe);
 109                le.post_host_time = wq->sq.sw_sq[wq->sq.cidx].host_time;
 110                le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
 111                le.wr_id = CQE_WRID_SQ_IDX(cqe);
 112        } else {
 113                le.qid = wq->rq.qid;
 114                le.opcode = FW_RI_RECEIVE;
 115                le.post_host_time = wq->rq.sw_rq[wq->rq.cidx].host_time;
 116                le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
 117                le.wr_id = CQE_WRID_MSN(cqe);
 118        }
 119        wq->rdev->wr_log[idx] = le;
 120}
 121
 122static int wr_log_show(struct seq_file *seq, void *v)
 123{
 124        struct c4iw_dev *dev = seq->private;
 125        ktime_t prev_time;
 126        struct wr_log_entry *lep;
 127        int prev_time_set = 0;
 128        int idx, end;
 129
 130#define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
 131
 132        idx = atomic_read(&dev->rdev.wr_log_idx) &
 133                (dev->rdev.wr_log_size - 1);
 134        end = idx - 1;
 135        if (end < 0)
 136                end = dev->rdev.wr_log_size - 1;
 137        lep = &dev->rdev.wr_log[idx];
 138        while (idx != end) {
 139                if (lep->valid) {
 140                        if (!prev_time_set) {
 141                                prev_time_set = 1;
 142                                prev_time = lep->poll_host_time;
 143                        }
 144                        seq_printf(seq, "%04u: nsec %llu qid %u opcode "
 145                                   "%u %s 0x%x host_wr_delta nsec %llu "
 146                                   "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
 147                                   "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
 148                                   "cqe_poll_delta_ns %llu\n",
 149                                   idx,
 150                                   ktime_to_ns(ktime_sub(lep->poll_host_time,
 151                                                         prev_time)),
 152                                   lep->qid, lep->opcode,
 153                                   lep->opcode == FW_RI_RECEIVE ?
 154                                                        "msn" : "wrid",
 155                                   lep->wr_id,
 156                                   ktime_to_ns(ktime_sub(lep->poll_host_time,
 157                                                         lep->post_host_time)),
 158                                   lep->post_sge_ts, lep->cqe_sge_ts,
 159                                   lep->poll_sge_ts,
 160                                   ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
 161                                   ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
 162                        prev_time = lep->poll_host_time;
 163                }
 164                idx++;
 165                if (idx > (dev->rdev.wr_log_size - 1))
 166                        idx = 0;
 167                lep = &dev->rdev.wr_log[idx];
 168        }
 169#undef ts2ns
 170        return 0;
 171}
 172
 173static int wr_log_open(struct inode *inode, struct file *file)
 174{
 175        return single_open(file, wr_log_show, inode->i_private);
 176}
 177
 178static ssize_t wr_log_clear(struct file *file, const char __user *buf,
 179                            size_t count, loff_t *pos)
 180{
 181        struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 182        int i;
 183
 184        if (dev->rdev.wr_log)
 185                for (i = 0; i < dev->rdev.wr_log_size; i++)
 186                        dev->rdev.wr_log[i].valid = 0;
 187        return count;
 188}
 189
 190static const struct file_operations wr_log_debugfs_fops = {
 191        .owner   = THIS_MODULE,
 192        .open    = wr_log_open,
 193        .release = single_release,
 194        .read    = seq_read,
 195        .llseek  = seq_lseek,
 196        .write   = wr_log_clear,
 197};
 198
 199static struct sockaddr_in zero_sin = {
 200        .sin_family = AF_INET,
 201};
 202
 203static struct sockaddr_in6 zero_sin6 = {
 204        .sin6_family = AF_INET6,
 205};
 206
 207static void set_ep_sin_addrs(struct c4iw_ep *ep,
 208                             struct sockaddr_in **lsin,
 209                             struct sockaddr_in **rsin,
 210                             struct sockaddr_in **m_lsin,
 211                             struct sockaddr_in **m_rsin)
 212{
 213        struct iw_cm_id *id = ep->com.cm_id;
 214
 215        *m_lsin = (struct sockaddr_in *)&ep->com.local_addr;
 216        *m_rsin = (struct sockaddr_in *)&ep->com.remote_addr;
 217        if (id) {
 218                *lsin = (struct sockaddr_in *)&id->local_addr;
 219                *rsin = (struct sockaddr_in *)&id->remote_addr;
 220        } else {
 221                *lsin = &zero_sin;
 222                *rsin = &zero_sin;
 223        }
 224}
 225
 226static void set_ep_sin6_addrs(struct c4iw_ep *ep,
 227                              struct sockaddr_in6 **lsin6,
 228                              struct sockaddr_in6 **rsin6,
 229                              struct sockaddr_in6 **m_lsin6,
 230                              struct sockaddr_in6 **m_rsin6)
 231{
 232        struct iw_cm_id *id = ep->com.cm_id;
 233
 234        *m_lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
 235        *m_rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
 236        if (id) {
 237                *lsin6 = (struct sockaddr_in6 *)&id->local_addr;
 238                *rsin6 = (struct sockaddr_in6 *)&id->remote_addr;
 239        } else {
 240                *lsin6 = &zero_sin6;
 241                *rsin6 = &zero_sin6;
 242        }
 243}
 244
 245static int dump_qp(unsigned long id, struct c4iw_qp *qp,
 246                   struct c4iw_debugfs_data *qpd)
 247{
 248        int space;
 249        int cc;
 250        if (id != qp->wq.sq.qid)
 251                return 0;
 252
 253        space = qpd->bufsize - qpd->pos - 1;
 254        if (space == 0)
 255                return 1;
 256
 257        if (qp->ep) {
 258                struct c4iw_ep *ep = qp->ep;
 259
 260                if (ep->com.local_addr.ss_family == AF_INET) {
 261                        struct sockaddr_in *lsin;
 262                        struct sockaddr_in *rsin;
 263                        struct sockaddr_in *m_lsin;
 264                        struct sockaddr_in *m_rsin;
 265
 266                        set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 267                        cc = snprintf(qpd->buf + qpd->pos, space,
 268                                      "rc qp sq id %u %s id %u state %u "
 269                                      "onchip %u ep tid %u state %u "
 270                                      "%pI4:%u/%u->%pI4:%u/%u\n",
 271                                      qp->wq.sq.qid, qp->srq ? "srq" : "rq",
 272                                      qp->srq ? qp->srq->idx : qp->wq.rq.qid,
 273                                      (int)qp->attr.state,
 274                                      qp->wq.sq.flags & T4_SQ_ONCHIP,
 275                                      ep->hwtid, (int)ep->com.state,
 276                                      &lsin->sin_addr, ntohs(lsin->sin_port),
 277                                      ntohs(m_lsin->sin_port),
 278                                      &rsin->sin_addr, ntohs(rsin->sin_port),
 279                                      ntohs(m_rsin->sin_port));
 280                } else {
 281                        struct sockaddr_in6 *lsin6;
 282                        struct sockaddr_in6 *rsin6;
 283                        struct sockaddr_in6 *m_lsin6;
 284                        struct sockaddr_in6 *m_rsin6;
 285
 286                        set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
 287                                          &m_rsin6);
 288                        cc = snprintf(qpd->buf + qpd->pos, space,
 289                                      "rc qp sq id %u rq id %u state %u "
 290                                      "onchip %u ep tid %u state %u "
 291                                      "%pI6:%u/%u->%pI6:%u/%u\n",
 292                                      qp->wq.sq.qid, qp->wq.rq.qid,
 293                                      (int)qp->attr.state,
 294                                      qp->wq.sq.flags & T4_SQ_ONCHIP,
 295                                      ep->hwtid, (int)ep->com.state,
 296                                      &lsin6->sin6_addr,
 297                                      ntohs(lsin6->sin6_port),
 298                                      ntohs(m_lsin6->sin6_port),
 299                                      &rsin6->sin6_addr,
 300                                      ntohs(rsin6->sin6_port),
 301                                      ntohs(m_rsin6->sin6_port));
 302                }
 303        } else
 304                cc = snprintf(qpd->buf + qpd->pos, space,
 305                             "qp sq id %u rq id %u state %u onchip %u\n",
 306                              qp->wq.sq.qid, qp->wq.rq.qid,
 307                              (int)qp->attr.state,
 308                              qp->wq.sq.flags & T4_SQ_ONCHIP);
 309        if (cc < space)
 310                qpd->pos += cc;
 311        return 0;
 312}
 313
 314static int qp_release(struct inode *inode, struct file *file)
 315{
 316        struct c4iw_debugfs_data *qpd = file->private_data;
 317        if (!qpd) {
 318                pr_info("%s null qpd?\n", __func__);
 319                return 0;
 320        }
 321        vfree(qpd->buf);
 322        kfree(qpd);
 323        return 0;
 324}
 325
 326static int qp_open(struct inode *inode, struct file *file)
 327{
 328        struct c4iw_qp *qp;
 329        struct c4iw_debugfs_data *qpd;
 330        unsigned long index;
 331        int count = 1;
 332
 333        qpd = kmalloc(sizeof(*qpd), GFP_KERNEL);
 334        if (!qpd)
 335                return -ENOMEM;
 336
 337        qpd->devp = inode->i_private;
 338        qpd->pos = 0;
 339
 340        /*
 341         * No need to lock; we drop the lock to call vmalloc so it's racy
 342         * anyway.  Someone who cares should switch this over to seq_file
 343         */
 344        xa_for_each(&qpd->devp->qps, index, qp)
 345                count++;
 346
 347        qpd->bufsize = count * 180;
 348        qpd->buf = vmalloc(qpd->bufsize);
 349        if (!qpd->buf) {
 350                kfree(qpd);
 351                return -ENOMEM;
 352        }
 353
 354        xa_lock_irq(&qpd->devp->qps);
 355        xa_for_each(&qpd->devp->qps, index, qp)
 356                dump_qp(index, qp, qpd);
 357        xa_unlock_irq(&qpd->devp->qps);
 358
 359        qpd->buf[qpd->pos++] = 0;
 360        file->private_data = qpd;
 361        return 0;
 362}
 363
 364static const struct file_operations qp_debugfs_fops = {
 365        .owner   = THIS_MODULE,
 366        .open    = qp_open,
 367        .release = qp_release,
 368        .read    = debugfs_read,
 369        .llseek  = default_llseek,
 370};
 371
 372static int dump_stag(unsigned long id, struct c4iw_debugfs_data *stagd)
 373{
 374        int space;
 375        int cc;
 376        struct fw_ri_tpte tpte;
 377        int ret;
 378
 379        space = stagd->bufsize - stagd->pos - 1;
 380        if (space == 0)
 381                return 1;
 382
 383        ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
 384                              (__be32 *)&tpte);
 385        if (ret) {
 386                dev_err(&stagd->devp->rdev.lldi.pdev->dev,
 387                        "%s cxgb4_read_tpte err %d\n", __func__, ret);
 388                return ret;
 389        }
 390        cc = snprintf(stagd->buf + stagd->pos, space,
 391                      "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
 392                      "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
 393                      (u32)id<<8,
 394                      FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
 395                      FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
 396                      FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
 397                      FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
 398                      FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
 399                      FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
 400                      ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
 401                      ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
 402        if (cc < space)
 403                stagd->pos += cc;
 404        return 0;
 405}
 406
 407static int stag_release(struct inode *inode, struct file *file)
 408{
 409        struct c4iw_debugfs_data *stagd = file->private_data;
 410        if (!stagd) {
 411                pr_info("%s null stagd?\n", __func__);
 412                return 0;
 413        }
 414        vfree(stagd->buf);
 415        kfree(stagd);
 416        return 0;
 417}
 418
 419static int stag_open(struct inode *inode, struct file *file)
 420{
 421        struct c4iw_debugfs_data *stagd;
 422        void *p;
 423        unsigned long index;
 424        int ret = 0;
 425        int count = 1;
 426
 427        stagd = kmalloc(sizeof(*stagd), GFP_KERNEL);
 428        if (!stagd) {
 429                ret = -ENOMEM;
 430                goto out;
 431        }
 432        stagd->devp = inode->i_private;
 433        stagd->pos = 0;
 434
 435        xa_for_each(&stagd->devp->mrs, index, p)
 436                count++;
 437
 438        stagd->bufsize = count * 256;
 439        stagd->buf = vmalloc(stagd->bufsize);
 440        if (!stagd->buf) {
 441                ret = -ENOMEM;
 442                goto err1;
 443        }
 444
 445        xa_lock_irq(&stagd->devp->mrs);
 446        xa_for_each(&stagd->devp->mrs, index, p)
 447                dump_stag(index, stagd);
 448        xa_unlock_irq(&stagd->devp->mrs);
 449
 450        stagd->buf[stagd->pos++] = 0;
 451        file->private_data = stagd;
 452        goto out;
 453err1:
 454        kfree(stagd);
 455out:
 456        return ret;
 457}
 458
 459static const struct file_operations stag_debugfs_fops = {
 460        .owner   = THIS_MODULE,
 461        .open    = stag_open,
 462        .release = stag_release,
 463        .read    = debugfs_read,
 464        .llseek  = default_llseek,
 465};
 466
 467static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
 468
 469static int stats_show(struct seq_file *seq, void *v)
 470{
 471        struct c4iw_dev *dev = seq->private;
 472
 473        seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
 474                   "Max", "Fail");
 475        seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 476                        dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
 477                        dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
 478        seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 479                        dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
 480                        dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
 481        seq_printf(seq, "     SRQS: %10llu %10llu %10llu %10llu\n",
 482                   dev->rdev.stats.srqt.total, dev->rdev.stats.srqt.cur,
 483                        dev->rdev.stats.srqt.max, dev->rdev.stats.srqt.fail);
 484        seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 485                        dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
 486                        dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
 487        seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 488                        dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
 489                        dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
 490        seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 491                        dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
 492                        dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
 493        seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 494                        dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
 495                        dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 496        seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 497        seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 498        seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
 499        seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
 500                   db_state_str[dev->db_state],
 501                   dev->rdev.stats.db_state_transitions,
 502                   dev->rdev.stats.db_fc_interruptions);
 503        seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
 504        seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
 505                   dev->rdev.stats.act_ofld_conn_fails);
 506        seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
 507                   dev->rdev.stats.pas_ofld_conn_fails);
 508        seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
 509        seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
 510        return 0;
 511}
 512
 513static int stats_open(struct inode *inode, struct file *file)
 514{
 515        return single_open(file, stats_show, inode->i_private);
 516}
 517
 518static ssize_t stats_clear(struct file *file, const char __user *buf,
 519                size_t count, loff_t *pos)
 520{
 521        struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
 522
 523        mutex_lock(&dev->rdev.stats.lock);
 524        dev->rdev.stats.pd.max = 0;
 525        dev->rdev.stats.pd.fail = 0;
 526        dev->rdev.stats.qid.max = 0;
 527        dev->rdev.stats.qid.fail = 0;
 528        dev->rdev.stats.stag.max = 0;
 529        dev->rdev.stats.stag.fail = 0;
 530        dev->rdev.stats.pbl.max = 0;
 531        dev->rdev.stats.pbl.fail = 0;
 532        dev->rdev.stats.rqt.max = 0;
 533        dev->rdev.stats.rqt.fail = 0;
 534        dev->rdev.stats.rqt.max = 0;
 535        dev->rdev.stats.rqt.fail = 0;
 536        dev->rdev.stats.ocqp.max = 0;
 537        dev->rdev.stats.ocqp.fail = 0;
 538        dev->rdev.stats.db_full = 0;
 539        dev->rdev.stats.db_empty = 0;
 540        dev->rdev.stats.db_drop = 0;
 541        dev->rdev.stats.db_state_transitions = 0;
 542        dev->rdev.stats.tcam_full = 0;
 543        dev->rdev.stats.act_ofld_conn_fails = 0;
 544        dev->rdev.stats.pas_ofld_conn_fails = 0;
 545        mutex_unlock(&dev->rdev.stats.lock);
 546        return count;
 547}
 548
 549static const struct file_operations stats_debugfs_fops = {
 550        .owner   = THIS_MODULE,
 551        .open    = stats_open,
 552        .release = single_release,
 553        .read    = seq_read,
 554        .llseek  = seq_lseek,
 555        .write   = stats_clear,
 556};
 557
 558static int dump_ep(struct c4iw_ep *ep, struct c4iw_debugfs_data *epd)
 559{
 560        int space;
 561        int cc;
 562
 563        space = epd->bufsize - epd->pos - 1;
 564        if (space == 0)
 565                return 1;
 566
 567        if (ep->com.local_addr.ss_family == AF_INET) {
 568                struct sockaddr_in *lsin;
 569                struct sockaddr_in *rsin;
 570                struct sockaddr_in *m_lsin;
 571                struct sockaddr_in *m_rsin;
 572
 573                set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
 574                cc = snprintf(epd->buf + epd->pos, space,
 575                              "ep %p cm_id %p qp %p state %d flags 0x%lx "
 576                              "history 0x%lx hwtid %d atid %d "
 577                              "conn_na %u abort_na %u "
 578                              "%pI4:%d/%d <-> %pI4:%d/%d\n",
 579                              ep, ep->com.cm_id, ep->com.qp,
 580                              (int)ep->com.state, ep->com.flags,
 581                              ep->com.history, ep->hwtid, ep->atid,
 582                              ep->stats.connect_neg_adv,
 583                              ep->stats.abort_neg_adv,
 584                              &lsin->sin_addr, ntohs(lsin->sin_port),
 585                              ntohs(m_lsin->sin_port),
 586                              &rsin->sin_addr, ntohs(rsin->sin_port),
 587                              ntohs(m_rsin->sin_port));
 588        } else {
 589                struct sockaddr_in6 *lsin6;
 590                struct sockaddr_in6 *rsin6;
 591                struct sockaddr_in6 *m_lsin6;
 592                struct sockaddr_in6 *m_rsin6;
 593
 594                set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
 595                cc = snprintf(epd->buf + epd->pos, space,
 596                              "ep %p cm_id %p qp %p state %d flags 0x%lx "
 597                              "history 0x%lx hwtid %d atid %d "
 598                              "conn_na %u abort_na %u "
 599                              "%pI6:%d/%d <-> %pI6:%d/%d\n",
 600                              ep, ep->com.cm_id, ep->com.qp,
 601                              (int)ep->com.state, ep->com.flags,
 602                              ep->com.history, ep->hwtid, ep->atid,
 603                              ep->stats.connect_neg_adv,
 604                              ep->stats.abort_neg_adv,
 605                              &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 606                              ntohs(m_lsin6->sin6_port),
 607                              &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
 608                              ntohs(m_rsin6->sin6_port));
 609        }
 610        if (cc < space)
 611                epd->pos += cc;
 612        return 0;
 613}
 614
 615static
 616int dump_listen_ep(struct c4iw_listen_ep *ep, struct c4iw_debugfs_data *epd)
 617{
 618        int space;
 619        int cc;
 620
 621        space = epd->bufsize - epd->pos - 1;
 622        if (space == 0)
 623                return 1;
 624
 625        if (ep->com.local_addr.ss_family == AF_INET) {
 626                struct sockaddr_in *lsin = (struct sockaddr_in *)
 627                        &ep->com.cm_id->local_addr;
 628                struct sockaddr_in *m_lsin = (struct sockaddr_in *)
 629                        &ep->com.cm_id->m_local_addr;
 630
 631                cc = snprintf(epd->buf + epd->pos, space,
 632                              "ep %p cm_id %p state %d flags 0x%lx stid %d "
 633                              "backlog %d %pI4:%d/%d\n",
 634                              ep, ep->com.cm_id, (int)ep->com.state,
 635                              ep->com.flags, ep->stid, ep->backlog,
 636                              &lsin->sin_addr, ntohs(lsin->sin_port),
 637                              ntohs(m_lsin->sin_port));
 638        } else {
 639                struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
 640                        &ep->com.cm_id->local_addr;
 641                struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
 642                        &ep->com.cm_id->m_local_addr;
 643
 644                cc = snprintf(epd->buf + epd->pos, space,
 645                              "ep %p cm_id %p state %d flags 0x%lx stid %d "
 646                              "backlog %d %pI6:%d/%d\n",
 647                              ep, ep->com.cm_id, (int)ep->com.state,
 648                              ep->com.flags, ep->stid, ep->backlog,
 649                              &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
 650                              ntohs(m_lsin6->sin6_port));
 651        }
 652        if (cc < space)
 653                epd->pos += cc;
 654        return 0;
 655}
 656
 657static int ep_release(struct inode *inode, struct file *file)
 658{
 659        struct c4iw_debugfs_data *epd = file->private_data;
 660        if (!epd) {
 661                pr_info("%s null qpd?\n", __func__);
 662                return 0;
 663        }
 664        vfree(epd->buf);
 665        kfree(epd);
 666        return 0;
 667}
 668
 669static int ep_open(struct inode *inode, struct file *file)
 670{
 671        struct c4iw_ep *ep;
 672        struct c4iw_listen_ep *lep;
 673        unsigned long index;
 674        struct c4iw_debugfs_data *epd;
 675        int ret = 0;
 676        int count = 1;
 677
 678        epd = kmalloc(sizeof(*epd), GFP_KERNEL);
 679        if (!epd) {
 680                ret = -ENOMEM;
 681                goto out;
 682        }
 683        epd->devp = inode->i_private;
 684        epd->pos = 0;
 685
 686        xa_for_each(&epd->devp->hwtids, index, ep)
 687                count++;
 688        xa_for_each(&epd->devp->atids, index, ep)
 689                count++;
 690        xa_for_each(&epd->devp->stids, index, lep)
 691                count++;
 692
 693        epd->bufsize = count * 240;
 694        epd->buf = vmalloc(epd->bufsize);
 695        if (!epd->buf) {
 696                ret = -ENOMEM;
 697                goto err1;
 698        }
 699
 700        xa_lock_irq(&epd->devp->hwtids);
 701        xa_for_each(&epd->devp->hwtids, index, ep)
 702                dump_ep(ep, epd);
 703        xa_unlock_irq(&epd->devp->hwtids);
 704        xa_lock_irq(&epd->devp->atids);
 705        xa_for_each(&epd->devp->atids, index, ep)
 706                dump_ep(ep, epd);
 707        xa_unlock_irq(&epd->devp->atids);
 708        xa_lock_irq(&epd->devp->stids);
 709        xa_for_each(&epd->devp->stids, index, lep)
 710                dump_listen_ep(lep, epd);
 711        xa_unlock_irq(&epd->devp->stids);
 712
 713        file->private_data = epd;
 714        goto out;
 715err1:
 716        kfree(epd);
 717out:
 718        return ret;
 719}
 720
 721static const struct file_operations ep_debugfs_fops = {
 722        .owner   = THIS_MODULE,
 723        .open    = ep_open,
 724        .release = ep_release,
 725        .read    = debugfs_read,
 726};
 727
 728static void setup_debugfs(struct c4iw_dev *devp)
 729{
 730        debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 731                                 (void *)devp, &qp_debugfs_fops, 4096);
 732
 733        debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
 734                                 (void *)devp, &stag_debugfs_fops, 4096);
 735
 736        debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
 737                                 (void *)devp, &stats_debugfs_fops, 4096);
 738
 739        debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
 740                                 (void *)devp, &ep_debugfs_fops, 4096);
 741
 742        if (c4iw_wr_log)
 743                debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 744                                         (void *)devp, &wr_log_debugfs_fops, 4096);
 745}
 746
 747void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 748                               struct c4iw_dev_ucontext *uctx)
 749{
 750        struct list_head *pos, *nxt;
 751        struct c4iw_qid_list *entry;
 752
 753        mutex_lock(&uctx->lock);
 754        list_for_each_safe(pos, nxt, &uctx->qpids) {
 755                entry = list_entry(pos, struct c4iw_qid_list, entry);
 756                list_del_init(&entry->entry);
 757                if (!(entry->qid & rdev->qpmask)) {
 758                        c4iw_put_resource(&rdev->resource.qid_table,
 759                                          entry->qid);
 760                        mutex_lock(&rdev->stats.lock);
 761                        rdev->stats.qid.cur -= rdev->qpmask + 1;
 762                        mutex_unlock(&rdev->stats.lock);
 763                }
 764                kfree(entry);
 765        }
 766
 767        list_for_each_safe(pos, nxt, &uctx->cqids) {
 768                entry = list_entry(pos, struct c4iw_qid_list, entry);
 769                list_del_init(&entry->entry);
 770                kfree(entry);
 771        }
 772        mutex_unlock(&uctx->lock);
 773}
 774
 775void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 776                            struct c4iw_dev_ucontext *uctx)
 777{
 778        INIT_LIST_HEAD(&uctx->qpids);
 779        INIT_LIST_HEAD(&uctx->cqids);
 780        mutex_init(&uctx->lock);
 781}
 782
 783/* Caller takes care of locking if needed */
 784static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 785{
 786        int err;
 787        unsigned int factor;
 788
 789        c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 790
 791        /*
 792         * This implementation assumes udb_density == ucq_density!  Eventually
 793         * we might need to support this but for now fail the open. Also the
 794         * cqid and qpid range must match for now.
 795         */
 796        if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
 797                pr_err("%s: unsupported udb/ucq densities %u/%u\n",
 798                       pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
 799                       rdev->lldi.ucq_density);
 800                return -EINVAL;
 801        }
 802        if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
 803            rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
 804                pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
 805                       pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
 806                       rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
 807                       rdev->lldi.vr->cq.size);
 808                return -EINVAL;
 809        }
 810
 811        /* This implementation requires a sge_host_page_size <= PAGE_SIZE. */
 812        if (rdev->lldi.sge_host_page_size > PAGE_SIZE) {
 813                pr_err("%s: unsupported sge host page size %u\n",
 814                       pci_name(rdev->lldi.pdev),
 815                       rdev->lldi.sge_host_page_size);
 816                return -EINVAL;
 817        }
 818
 819        factor = PAGE_SIZE / rdev->lldi.sge_host_page_size;
 820        rdev->qpmask = (rdev->lldi.udb_density * factor) - 1;
 821        rdev->cqmask = (rdev->lldi.ucq_density * factor) - 1;
 822
 823        pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u srq size %u\n",
 824                 pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 825                 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 826                 rdev->lldi.vr->pbl.start,
 827                 rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 828                 rdev->lldi.vr->rq.size,
 829                 rdev->lldi.vr->qp.start,
 830                 rdev->lldi.vr->qp.size,
 831                 rdev->lldi.vr->cq.start,
 832                 rdev->lldi.vr->cq.size,
 833                 rdev->lldi.vr->srq.size);
 834        pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
 835                 &rdev->lldi.pdev->resource[2],
 836                 rdev->lldi.db_reg, rdev->lldi.gts_reg,
 837                 rdev->qpmask, rdev->cqmask);
 838
 839        if (c4iw_num_stags(rdev) == 0)
 840                return -EINVAL;
 841
 842        rdev->stats.pd.total = T4_MAX_NUM_PD;
 843        rdev->stats.stag.total = rdev->lldi.vr->stag.size;
 844        rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
 845        rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
 846        rdev->stats.srqt.total = rdev->lldi.vr->srq.size;
 847        rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
 848        rdev->stats.qid.total = rdev->lldi.vr->qp.size;
 849
 850        err = c4iw_init_resource(rdev, c4iw_num_stags(rdev),
 851                                 T4_MAX_NUM_PD, rdev->lldi.vr->srq.size);
 852        if (err) {
 853                pr_err("error %d initializing resources\n", err);
 854                return err;
 855        }
 856        err = c4iw_pblpool_create(rdev);
 857        if (err) {
 858                pr_err("error %d initializing pbl pool\n", err);
 859                goto destroy_resource;
 860        }
 861        err = c4iw_rqtpool_create(rdev);
 862        if (err) {
 863                pr_err("error %d initializing rqt pool\n", err);
 864                goto destroy_pblpool;
 865        }
 866        err = c4iw_ocqp_pool_create(rdev);
 867        if (err) {
 868                pr_err("error %d initializing ocqp pool\n", err);
 869                goto destroy_rqtpool;
 870        }
 871        rdev->status_page = (struct t4_dev_status_page *)
 872                            __get_free_page(GFP_KERNEL);
 873        if (!rdev->status_page) {
 874                err = -ENOMEM;
 875                goto destroy_ocqp_pool;
 876        }
 877        rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
 878        rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
 879        rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
 880        rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
 881        rdev->status_page->write_cmpl_supported = rdev->lldi.write_cmpl_support;
 882
 883        if (c4iw_wr_log) {
 884                rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
 885                                       sizeof(*rdev->wr_log),
 886                                       GFP_KERNEL);
 887                if (rdev->wr_log) {
 888                        rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
 889                        atomic_set(&rdev->wr_log_idx, 0);
 890                }
 891        }
 892
 893        rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
 894        if (!rdev->free_workq) {
 895                err = -ENOMEM;
 896                goto err_free_status_page_and_wr_log;
 897        }
 898
 899        rdev->status_page->db_off = 0;
 900
 901        init_completion(&rdev->rqt_compl);
 902        init_completion(&rdev->pbl_compl);
 903        kref_init(&rdev->rqt_kref);
 904        kref_init(&rdev->pbl_kref);
 905
 906        return 0;
 907err_free_status_page_and_wr_log:
 908        if (c4iw_wr_log && rdev->wr_log)
 909                kfree(rdev->wr_log);
 910        free_page((unsigned long)rdev->status_page);
 911destroy_ocqp_pool:
 912        c4iw_ocqp_pool_destroy(rdev);
 913destroy_rqtpool:
 914        c4iw_rqtpool_destroy(rdev);
 915destroy_pblpool:
 916        c4iw_pblpool_destroy(rdev);
 917destroy_resource:
 918        c4iw_destroy_resource(&rdev->resource);
 919        return err;
 920}
 921
 922static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 923{
 924        kfree(rdev->wr_log);
 925        c4iw_release_dev_ucontext(rdev, &rdev->uctx);
 926        free_page((unsigned long)rdev->status_page);
 927        c4iw_pblpool_destroy(rdev);
 928        c4iw_rqtpool_destroy(rdev);
 929        wait_for_completion(&rdev->pbl_compl);
 930        wait_for_completion(&rdev->rqt_compl);
 931        c4iw_ocqp_pool_destroy(rdev);
 932        destroy_workqueue(rdev->free_workq);
 933        c4iw_destroy_resource(&rdev->resource);
 934}
 935
 936void c4iw_dealloc(struct uld_ctx *ctx)
 937{
 938        c4iw_rdev_close(&ctx->dev->rdev);
 939        WARN_ON(!xa_empty(&ctx->dev->cqs));
 940        WARN_ON(!xa_empty(&ctx->dev->qps));
 941        WARN_ON(!xa_empty(&ctx->dev->mrs));
 942        wait_event(ctx->dev->wait, xa_empty(&ctx->dev->hwtids));
 943        WARN_ON(!xa_empty(&ctx->dev->stids));
 944        WARN_ON(!xa_empty(&ctx->dev->atids));
 945        if (ctx->dev->rdev.bar2_kva)
 946                iounmap(ctx->dev->rdev.bar2_kva);
 947        if (ctx->dev->rdev.oc_mw_kva)
 948                iounmap(ctx->dev->rdev.oc_mw_kva);
 949        ib_dealloc_device(&ctx->dev->ibdev);
 950        ctx->dev = NULL;
 951}
 952
 953static void c4iw_remove(struct uld_ctx *ctx)
 954{
 955        pr_debug("c4iw_dev %p\n", ctx->dev);
 956        c4iw_unregister_device(ctx->dev);
 957        c4iw_dealloc(ctx);
 958}
 959
 960static int rdma_supported(const struct cxgb4_lld_info *infop)
 961{
 962        return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
 963               infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
 964               infop->vr->cq.size > 0;
 965}
 966
 967static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 968{
 969        struct c4iw_dev *devp;
 970        int ret;
 971
 972        if (!rdma_supported(infop)) {
 973                pr_info("%s: RDMA not supported on this device\n",
 974                        pci_name(infop->pdev));
 975                return ERR_PTR(-ENOSYS);
 976        }
 977        if (!ocqp_supported(infop))
 978                pr_info("%s: On-Chip Queues not supported on this device\n",
 979                        pci_name(infop->pdev));
 980
 981        devp = ib_alloc_device(c4iw_dev, ibdev);
 982        if (!devp) {
 983                pr_err("Cannot allocate ib device\n");
 984                return ERR_PTR(-ENOMEM);
 985        }
 986        devp->rdev.lldi = *infop;
 987
 988        /* init various hw-queue params based on lld info */
 989        pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
 990                 devp->rdev.lldi.sge_ingpadboundary,
 991                 devp->rdev.lldi.sge_egrstatuspagesize);
 992
 993        devp->rdev.hw_queue.t4_eq_status_entries =
 994                devp->rdev.lldi.sge_egrstatuspagesize / 64;
 995        devp->rdev.hw_queue.t4_max_eq_size = 65520;
 996        devp->rdev.hw_queue.t4_max_iq_size = 65520;
 997        devp->rdev.hw_queue.t4_max_rq_size = 8192 -
 998                devp->rdev.hw_queue.t4_eq_status_entries - 1;
 999        devp->rdev.hw_queue.t4_max_sq_size =
1000                devp->rdev.hw_queue.t4_max_eq_size -
1001                devp->rdev.hw_queue.t4_eq_status_entries - 1;
1002        devp->rdev.hw_queue.t4_max_qp_depth =
1003                devp->rdev.hw_queue.t4_max_rq_size;
1004        devp->rdev.hw_queue.t4_max_cq_depth =
1005                devp->rdev.hw_queue.t4_max_iq_size - 2;
1006        devp->rdev.hw_queue.t4_stat_len =
1007                devp->rdev.lldi.sge_egrstatuspagesize;
1008
1009        /*
1010         * For T5/T6 devices, we map all of BAR2 with WC.
1011         * For T4 devices with onchip qp mem, we map only that part
1012         * of BAR2 with WC.
1013         */
1014        devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
1015        if (!is_t4(devp->rdev.lldi.adapter_type)) {
1016                devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
1017                        pci_resource_len(devp->rdev.lldi.pdev, 2));
1018                if (!devp->rdev.bar2_kva) {
1019                        pr_err("Unable to ioremap BAR2\n");
1020                        ib_dealloc_device(&devp->ibdev);
1021                        return ERR_PTR(-EINVAL);
1022                }
1023        } else if (ocqp_supported(infop)) {
1024                devp->rdev.oc_mw_pa =
1025                        pci_resource_start(devp->rdev.lldi.pdev, 2) +
1026                        pci_resource_len(devp->rdev.lldi.pdev, 2) -
1027                        roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1028                devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1029                        devp->rdev.lldi.vr->ocq.size);
1030                if (!devp->rdev.oc_mw_kva) {
1031                        pr_err("Unable to ioremap onchip mem\n");
1032                        ib_dealloc_device(&devp->ibdev);
1033                        return ERR_PTR(-EINVAL);
1034                }
1035        }
1036
1037        pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1038                 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1039                 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1040
1041        ret = c4iw_rdev_open(&devp->rdev);
1042        if (ret) {
1043                pr_err("Unable to open CXIO rdev err %d\n", ret);
1044                ib_dealloc_device(&devp->ibdev);
1045                return ERR_PTR(ret);
1046        }
1047
1048        xa_init_flags(&devp->cqs, XA_FLAGS_LOCK_IRQ);
1049        xa_init_flags(&devp->qps, XA_FLAGS_LOCK_IRQ);
1050        xa_init_flags(&devp->mrs, XA_FLAGS_LOCK_IRQ);
1051        xa_init_flags(&devp->hwtids, XA_FLAGS_LOCK_IRQ);
1052        xa_init_flags(&devp->atids, XA_FLAGS_LOCK_IRQ);
1053        xa_init_flags(&devp->stids, XA_FLAGS_LOCK_IRQ);
1054        mutex_init(&devp->rdev.stats.lock);
1055        mutex_init(&devp->db_mutex);
1056        INIT_LIST_HEAD(&devp->db_fc_list);
1057        init_waitqueue_head(&devp->wait);
1058        devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1059
1060        if (c4iw_debugfs_root) {
1061                devp->debugfs_root = debugfs_create_dir(
1062                                        pci_name(devp->rdev.lldi.pdev),
1063                                        c4iw_debugfs_root);
1064                setup_debugfs(devp);
1065        }
1066
1067
1068        return devp;
1069}
1070
1071static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1072{
1073        struct uld_ctx *ctx;
1074        static int vers_printed;
1075        int i;
1076
1077        if (!vers_printed++)
1078                pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1079                        DRV_VERSION);
1080
1081        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1082        if (!ctx) {
1083                ctx = ERR_PTR(-ENOMEM);
1084                goto out;
1085        }
1086        ctx->lldi = *infop;
1087
1088        pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1089                 pci_name(ctx->lldi.pdev),
1090                 ctx->lldi.nchan, ctx->lldi.nrxq,
1091                 ctx->lldi.ntxq, ctx->lldi.nports);
1092
1093        mutex_lock(&dev_mutex);
1094        list_add_tail(&ctx->entry, &uld_ctx_list);
1095        mutex_unlock(&dev_mutex);
1096
1097        for (i = 0; i < ctx->lldi.nrxq; i++)
1098                pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1099out:
1100        return ctx;
1101}
1102
1103static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1104                                                 const __be64 *rsp,
1105                                                 u32 pktshift)
1106{
1107        struct sk_buff *skb;
1108
1109        /*
1110         * Allocate space for cpl_pass_accept_req which will be synthesized by
1111         * driver. Once the driver synthesizes the request the skb will go
1112         * through the regular cpl_pass_accept_req processing.
1113         * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1114         * cpl_rx_pkt.
1115         */
1116        skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1117                        sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1118        if (unlikely(!skb))
1119                return NULL;
1120
1121        __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1122                  sizeof(struct rss_header) - pktshift);
1123
1124        /*
1125         * This skb will contain:
1126         *   rss_header from the rspq descriptor (1 flit)
1127         *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1128         *   space for the difference between the size of an
1129         *      rx_pkt and pass_accept_req cpl (1 flit)
1130         *   the packet data from the gl
1131         */
1132        skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1133                                sizeof(struct rss_header));
1134        skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1135                                       sizeof(struct cpl_pass_accept_req),
1136                                       gl->va + pktshift,
1137                                       gl->tot_len - pktshift);
1138        return skb;
1139}
1140
1141static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1142                           const __be64 *rsp)
1143{
1144        unsigned int opcode = *(u8 *)rsp;
1145        struct sk_buff *skb;
1146
1147        if (opcode != CPL_RX_PKT)
1148                goto out;
1149
1150        skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1151        if (skb == NULL)
1152                goto out;
1153
1154        if (c4iw_handlers[opcode] == NULL) {
1155                pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1156                kfree_skb(skb);
1157                goto out;
1158        }
1159        c4iw_handlers[opcode](dev, skb);
1160        return 1;
1161out:
1162        return 0;
1163}
1164
1165static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1166                        const struct pkt_gl *gl)
1167{
1168        struct uld_ctx *ctx = handle;
1169        struct c4iw_dev *dev = ctx->dev;
1170        struct sk_buff *skb;
1171        u8 opcode;
1172
1173        if (gl == NULL) {
1174                /* omit RSS and rsp_ctrl at end of descriptor */
1175                unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1176
1177                skb = alloc_skb(256, GFP_ATOMIC);
1178                if (!skb)
1179                        goto nomem;
1180                __skb_put(skb, len);
1181                skb_copy_to_linear_data(skb, &rsp[1], len);
1182        } else if (gl == CXGB4_MSG_AN) {
1183                const struct rsp_ctrl *rc = (void *)rsp;
1184
1185                u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1186                c4iw_ev_handler(dev, qid);
1187                return 0;
1188        } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1189                if (recv_rx_pkt(dev, gl, rsp))
1190                        return 0;
1191
1192                pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1193                        pci_name(ctx->lldi.pdev), gl->va,
1194                        be64_to_cpu(*rsp),
1195                        be64_to_cpu(*(__force __be64 *)gl->va),
1196                        gl->tot_len);
1197
1198                return 0;
1199        } else {
1200                skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1201                if (unlikely(!skb))
1202                        goto nomem;
1203        }
1204
1205        opcode = *(u8 *)rsp;
1206        if (c4iw_handlers[opcode]) {
1207                c4iw_handlers[opcode](dev, skb);
1208        } else {
1209                pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1210                kfree_skb(skb);
1211        }
1212
1213        return 0;
1214nomem:
1215        return -1;
1216}
1217
1218static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1219{
1220        struct uld_ctx *ctx = handle;
1221
1222        pr_debug("new_state %u\n", new_state);
1223        switch (new_state) {
1224        case CXGB4_STATE_UP:
1225                pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1226                if (!ctx->dev) {
1227                        ctx->dev = c4iw_alloc(&ctx->lldi);
1228                        if (IS_ERR(ctx->dev)) {
1229                                pr_err("%s: initialization failed: %ld\n",
1230                                       pci_name(ctx->lldi.pdev),
1231                                       PTR_ERR(ctx->dev));
1232                                ctx->dev = NULL;
1233                                break;
1234                        }
1235
1236                        INIT_WORK(&ctx->reg_work, c4iw_register_device);
1237                        queue_work(reg_workq, &ctx->reg_work);
1238                }
1239                break;
1240        case CXGB4_STATE_DOWN:
1241                pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1242                if (ctx->dev)
1243                        c4iw_remove(ctx);
1244                break;
1245        case CXGB4_STATE_FATAL_ERROR:
1246        case CXGB4_STATE_START_RECOVERY:
1247                pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1248                if (ctx->dev) {
1249                        struct ib_event event = {};
1250
1251                        ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1252                        event.event  = IB_EVENT_DEVICE_FATAL;
1253                        event.device = &ctx->dev->ibdev;
1254                        ib_dispatch_event(&event);
1255                        c4iw_remove(ctx);
1256                }
1257                break;
1258        case CXGB4_STATE_DETACH:
1259                pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1260                if (ctx->dev)
1261                        c4iw_remove(ctx);
1262                break;
1263        }
1264        return 0;
1265}
1266
1267static void stop_queues(struct uld_ctx *ctx)
1268{
1269        struct c4iw_qp *qp;
1270        unsigned long index, flags;
1271
1272        xa_lock_irqsave(&ctx->dev->qps, flags);
1273        ctx->dev->rdev.stats.db_state_transitions++;
1274        ctx->dev->db_state = STOPPED;
1275        if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1276                xa_for_each(&ctx->dev->qps, index, qp)
1277                        t4_disable_wq_db(&qp->wq);
1278        } else {
1279                ctx->dev->rdev.status_page->db_off = 1;
1280        }
1281        xa_unlock_irqrestore(&ctx->dev->qps, flags);
1282}
1283
1284static void resume_rc_qp(struct c4iw_qp *qp)
1285{
1286        spin_lock(&qp->lock);
1287        t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1288        qp->wq.sq.wq_pidx_inc = 0;
1289        t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1290        qp->wq.rq.wq_pidx_inc = 0;
1291        spin_unlock(&qp->lock);
1292}
1293
1294static void resume_a_chunk(struct uld_ctx *ctx)
1295{
1296        int i;
1297        struct c4iw_qp *qp;
1298
1299        for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1300                qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1301                                      db_fc_entry);
1302                list_del_init(&qp->db_fc_entry);
1303                resume_rc_qp(qp);
1304                if (list_empty(&ctx->dev->db_fc_list))
1305                        break;
1306        }
1307}
1308
1309static void resume_queues(struct uld_ctx *ctx)
1310{
1311        xa_lock_irq(&ctx->dev->qps);
1312        if (ctx->dev->db_state != STOPPED)
1313                goto out;
1314        ctx->dev->db_state = FLOW_CONTROL;
1315        while (1) {
1316                if (list_empty(&ctx->dev->db_fc_list)) {
1317                        struct c4iw_qp *qp;
1318                        unsigned long index;
1319
1320                        WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1321                        ctx->dev->db_state = NORMAL;
1322                        ctx->dev->rdev.stats.db_state_transitions++;
1323                        if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1324                                xa_for_each(&ctx->dev->qps, index, qp)
1325                                        t4_enable_wq_db(&qp->wq);
1326                        } else {
1327                                ctx->dev->rdev.status_page->db_off = 0;
1328                        }
1329                        break;
1330                } else {
1331                        if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1332                            < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1333                               DB_FC_DRAIN_THRESH)) {
1334                                resume_a_chunk(ctx);
1335                        }
1336                        if (!list_empty(&ctx->dev->db_fc_list)) {
1337                                xa_unlock_irq(&ctx->dev->qps);
1338                                if (DB_FC_RESUME_DELAY) {
1339                                        set_current_state(TASK_UNINTERRUPTIBLE);
1340                                        schedule_timeout(DB_FC_RESUME_DELAY);
1341                                }
1342                                xa_lock_irq(&ctx->dev->qps);
1343                                if (ctx->dev->db_state != FLOW_CONTROL)
1344                                        break;
1345                        }
1346                }
1347        }
1348out:
1349        if (ctx->dev->db_state != NORMAL)
1350                ctx->dev->rdev.stats.db_fc_interruptions++;
1351        xa_unlock_irq(&ctx->dev->qps);
1352}
1353
1354struct qp_list {
1355        unsigned idx;
1356        struct c4iw_qp **qps;
1357};
1358
1359static void deref_qps(struct qp_list *qp_list)
1360{
1361        int idx;
1362
1363        for (idx = 0; idx < qp_list->idx; idx++)
1364                c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1365}
1366
1367static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1368{
1369        int idx;
1370        int ret;
1371
1372        for (idx = 0; idx < qp_list->idx; idx++) {
1373                struct c4iw_qp *qp = qp_list->qps[idx];
1374
1375                xa_lock_irq(&qp->rhp->qps);
1376                spin_lock(&qp->lock);
1377                ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1378                                          qp->wq.sq.qid,
1379                                          t4_sq_host_wq_pidx(&qp->wq),
1380                                          t4_sq_wq_size(&qp->wq));
1381                if (ret) {
1382                        pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1383                               pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1384                        spin_unlock(&qp->lock);
1385                        xa_unlock_irq(&qp->rhp->qps);
1386                        return;
1387                }
1388                qp->wq.sq.wq_pidx_inc = 0;
1389
1390                ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1391                                          qp->wq.rq.qid,
1392                                          t4_rq_host_wq_pidx(&qp->wq),
1393                                          t4_rq_wq_size(&qp->wq));
1394
1395                if (ret) {
1396                        pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1397                               pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1398                        spin_unlock(&qp->lock);
1399                        xa_unlock_irq(&qp->rhp->qps);
1400                        return;
1401                }
1402                qp->wq.rq.wq_pidx_inc = 0;
1403                spin_unlock(&qp->lock);
1404                xa_unlock_irq(&qp->rhp->qps);
1405
1406                /* Wait for the dbfifo to drain */
1407                while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1408                        set_current_state(TASK_UNINTERRUPTIBLE);
1409                        schedule_timeout(usecs_to_jiffies(10));
1410                }
1411        }
1412}
1413
1414static void recover_queues(struct uld_ctx *ctx)
1415{
1416        struct c4iw_qp *qp;
1417        unsigned long index;
1418        int count = 0;
1419        struct qp_list qp_list;
1420        int ret;
1421
1422        /* slow everybody down */
1423        set_current_state(TASK_UNINTERRUPTIBLE);
1424        schedule_timeout(usecs_to_jiffies(1000));
1425
1426        /* flush the SGE contexts */
1427        ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1428        if (ret) {
1429                pr_err("%s: Fatal error - DB overflow recovery failed\n",
1430                       pci_name(ctx->lldi.pdev));
1431                return;
1432        }
1433
1434        /* Count active queues so we can build a list of queues to recover */
1435        xa_lock_irq(&ctx->dev->qps);
1436        WARN_ON(ctx->dev->db_state != STOPPED);
1437        ctx->dev->db_state = RECOVERY;
1438        xa_for_each(&ctx->dev->qps, index, qp)
1439                count++;
1440
1441        qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
1442        if (!qp_list.qps) {
1443                xa_unlock_irq(&ctx->dev->qps);
1444                return;
1445        }
1446        qp_list.idx = 0;
1447
1448        /* add and ref each qp so it doesn't get freed */
1449        xa_for_each(&ctx->dev->qps, index, qp) {
1450                c4iw_qp_add_ref(&qp->ibqp);
1451                qp_list.qps[qp_list.idx++] = qp;
1452        }
1453
1454        xa_unlock_irq(&ctx->dev->qps);
1455
1456        /* now traverse the list in a safe context to recover the db state*/
1457        recover_lost_dbs(ctx, &qp_list);
1458
1459        /* we're almost done!  deref the qps and clean up */
1460        deref_qps(&qp_list);
1461        kfree(qp_list.qps);
1462
1463        xa_lock_irq(&ctx->dev->qps);
1464        WARN_ON(ctx->dev->db_state != RECOVERY);
1465        ctx->dev->db_state = STOPPED;
1466        xa_unlock_irq(&ctx->dev->qps);
1467}
1468
1469static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1470{
1471        struct uld_ctx *ctx = handle;
1472
1473        switch (control) {
1474        case CXGB4_CONTROL_DB_FULL:
1475                stop_queues(ctx);
1476                ctx->dev->rdev.stats.db_full++;
1477                break;
1478        case CXGB4_CONTROL_DB_EMPTY:
1479                resume_queues(ctx);
1480                mutex_lock(&ctx->dev->rdev.stats.lock);
1481                ctx->dev->rdev.stats.db_empty++;
1482                mutex_unlock(&ctx->dev->rdev.stats.lock);
1483                break;
1484        case CXGB4_CONTROL_DB_DROP:
1485                recover_queues(ctx);
1486                mutex_lock(&ctx->dev->rdev.stats.lock);
1487                ctx->dev->rdev.stats.db_drop++;
1488                mutex_unlock(&ctx->dev->rdev.stats.lock);
1489                break;
1490        default:
1491                pr_warn("%s: unknown control cmd %u\n",
1492                        pci_name(ctx->lldi.pdev), control);
1493                break;
1494        }
1495        return 0;
1496}
1497
1498static struct cxgb4_uld_info c4iw_uld_info = {
1499        .name = DRV_NAME,
1500        .nrxq = MAX_ULD_QSETS,
1501        .ntxq = MAX_ULD_QSETS,
1502        .rxq_size = 511,
1503        .ciq = true,
1504        .lro = false,
1505        .add = c4iw_uld_add,
1506        .rx_handler = c4iw_uld_rx_handler,
1507        .state_change = c4iw_uld_state_change,
1508        .control = c4iw_uld_control,
1509};
1510
1511void _c4iw_free_wr_wait(struct kref *kref)
1512{
1513        struct c4iw_wr_wait *wr_waitp;
1514
1515        wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1516        pr_debug("Free wr_wait %p\n", wr_waitp);
1517        kfree(wr_waitp);
1518}
1519
1520struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1521{
1522        struct c4iw_wr_wait *wr_waitp;
1523
1524        wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1525        if (wr_waitp) {
1526                kref_init(&wr_waitp->kref);
1527                pr_debug("wr_wait %p\n", wr_waitp);
1528        }
1529        return wr_waitp;
1530}
1531
1532static int __init c4iw_init_module(void)
1533{
1534        int err;
1535
1536        err = c4iw_cm_init();
1537        if (err)
1538                return err;
1539
1540        c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1541
1542        reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1543        if (!reg_workq) {
1544                pr_err("Failed creating workqueue to register iwarp device\n");
1545                return -ENOMEM;
1546        }
1547
1548        cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1549
1550        return 0;
1551}
1552
1553static void __exit c4iw_exit_module(void)
1554{
1555        struct uld_ctx *ctx, *tmp;
1556
1557        mutex_lock(&dev_mutex);
1558        list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1559                if (ctx->dev)
1560                        c4iw_remove(ctx);
1561                kfree(ctx);
1562        }
1563        mutex_unlock(&dev_mutex);
1564        flush_workqueue(reg_workq);
1565        destroy_workqueue(reg_workq);
1566        cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1567        c4iw_cm_term();
1568        debugfs_remove_recursive(c4iw_debugfs_root);
1569}
1570
1571module_init(c4iw_init_module);
1572module_exit(c4iw_exit_module);
1573