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
  36 #include <rdma/ib_verbs.h>
  37
  38 #include "iw_cxgb4.h"
  39
  40 #define DRV_VERSION "0.1"
  41
  42 MODULE_AUTHOR("Steve Wise");
  43 MODULE_DESCRIPTION("Chelsio T4 RDMA Driver");
  44 MODULE_LICENSE("Dual BSD/GPL");
  45 MODULE_VERSION(DRV_VERSION);
  46
  47 static LIST_HEAD(dev_list);
  48 static DEFINE_MUTEX(dev_mutex);
  49
  50 static struct dentry *c4iw_debugfs_root;
  51
  52 struct c4iw_debugfs_data {
  53         struct c4iw_dev *devp;
  54         char *buf;
  55         int bufsize;
  56         int pos;
  57 };
  58
  59 static int count_idrs(int id, void *p, void *data)
  60 {
  61         int *countp = data;
  62
  63         *countp = *countp + 1;
  64         return 0;
  65 }
  66
  67 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  68                             loff_t *ppos)
  69 {
  70         struct c4iw_debugfs_data *d = file->private_data;
  71         loff_t pos = *ppos;
  72         loff_t avail = d->pos;
  73
  74         if (pos < 0)
  75                 return -EINVAL;
  76         if (pos >= avail)
  77                 return 0;
  78         if (count > avail - pos)
  79                 count = avail - pos;
  80
  81         while (count) {
  82                 size_t len = 0;
  83
  84                 len = min((int)count, (int)d->pos - (int)pos);
  85                 if (copy_to_user(buf, d->buf + pos, len))
  86                         return -EFAULT;
  87                 if (len == 0)
  88                         return -EINVAL;
  89
  90                 buf += len;
  91                 pos += len;
  92                 count -= len;
  93         }
  94         count = pos - *ppos;
  95         *ppos = pos;
  96         return count;
  97 }
  98
  99 static int dump_qp(int id, void *p, void *data)
 100 {
 101         struct c4iw_qp *qp = p;
 102         struct c4iw_debugfs_data *qpd = data;
 103         int space;
 104         int cc;
 105
 106         if (id != qp->wq.sq.qid)
 107                 return 0;
 108
 109         space = qpd->bufsize - qpd->pos - 1;
 110         if (space == 0)
 111                 return 1;
 112
 113         if (qp->ep)
 114                 cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u "
 115                              "ep tid %u state %u %pI4:%u->%pI4:%u\n",
 116                              qp->wq.sq.qid, (int)qp->attr.state,
 117                              qp->ep->hwtid, (int)qp->ep->com.state,
 118                              &qp->ep->com.local_addr.sin_addr.s_addr,
 119                              ntohs(qp->ep->com.local_addr.sin_port),
 120                              &qp->ep->com.remote_addr.sin_addr.s_addr,
 121                              ntohs(qp->ep->com.remote_addr.sin_port));
 122         else
 123                 cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u\n",
 124                               qp->wq.sq.qid, (int)qp->attr.state);
 125         if (cc < space)
 126                 qpd->pos += cc;
 127         return 0;
 128 }
 129
 130 static int qp_release(struct inode *inode, struct file *file)
 131 {
 132         struct c4iw_debugfs_data *qpd = file->private_data;
 133         if (!qpd) {
 134                 printk(KERN_INFO "%s null qpd?\n", __func__);
 135                 return 0;
 136         }
 137         kfree(qpd->buf);
 138         kfree(qpd);
 139         return 0;
 140 }
 141
 142 static int qp_open(struct inode *inode, struct file *file)
 143 {
 144         struct c4iw_debugfs_data *qpd;
 145         int ret = 0;
 146         int count = 1;
 147
 148         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 149         if (!qpd) {
 150                 ret = -ENOMEM;
 151                 goto out;
 152         }
 153         qpd->devp = inode->i_private;
 154         qpd->pos = 0;
 155
 156         spin_lock_irq(&qpd->devp->lock);
 157         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 158         spin_unlock_irq(&qpd->devp->lock);
 159
 160         qpd->bufsize = count * 128;
 161         qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL);
 162         if (!qpd->buf) {
 163                 ret = -ENOMEM;
 164                 goto err1;
 165         }
 166
 167         spin_lock_irq(&qpd->devp->lock);
 168         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 169         spin_unlock_irq(&qpd->devp->lock);
 170
 171         qpd->buf[qpd->pos++] = 0;
 172         file->private_data = qpd;
 173         goto out;
 174 err1:
 175         kfree(qpd);
 176 out:
 177         return ret;
 178 }
 179
 180 static const struct file_operations qp_debugfs_fops = {
 181         .owner   = THIS_MODULE,
 182         .open    = qp_open,
 183         .release = qp_release,
 184         .read    = debugfs_read,
 185 };
 186
 187 static int dump_stag(int id, void *p, void *data)
 188 {
 189         struct c4iw_debugfs_data *stagd = data;
 190         int space;
 191         int cc;
 192
 193         space = stagd->bufsize - stagd->pos - 1;
 194         if (space == 0)
 195                 return 1;
 196
 197         cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
 198         if (cc < space)
 199                 stagd->pos += cc;
 200         return 0;
 201 }
 202
 203 static int stag_release(struct inode *inode, struct file *file)
 204 {
 205         struct c4iw_debugfs_data *stagd = file->private_data;
 206         if (!stagd) {
 207                 printk(KERN_INFO "%s null stagd?\n", __func__);
 208                 return 0;
 209         }
 210         kfree(stagd->buf);
 211         kfree(stagd);
 212         return 0;
 213 }
 214
 215 static int stag_open(struct inode *inode, struct file *file)
 216 {
 217         struct c4iw_debugfs_data *stagd;
 218         int ret = 0;
 219         int count = 1;
 220
 221         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 222         if (!stagd) {
 223                 ret = -ENOMEM;
 224                 goto out;
 225         }
 226         stagd->devp = inode->i_private;
 227         stagd->pos = 0;
 228
 229         spin_lock_irq(&stagd->devp->lock);
 230         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 231         spin_unlock_irq(&stagd->devp->lock);
 232
 233         stagd->bufsize = count * sizeof("0x12345678\n");
 234         stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
 235         if (!stagd->buf) {
 236                 ret = -ENOMEM;
 237                 goto err1;
 238         }
 239
 240         spin_lock_irq(&stagd->devp->lock);
 241         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 242         spin_unlock_irq(&stagd->devp->lock);
 243
 244         stagd->buf[stagd->pos++] = 0;
 245         file->private_data = stagd;
 246         goto out;
 247 err1:
 248         kfree(stagd);
 249 out:
 250         return ret;
 251 }
 252
 253 static const struct file_operations stag_debugfs_fops = {
 254         .owner   = THIS_MODULE,
 255         .open    = stag_open,
 256         .release = stag_release,
 257         .read    = debugfs_read,
 258 };
 259
 260 static int setup_debugfs(struct c4iw_dev *devp)
 261 {
 262         struct dentry *de;
 263
 264         if (!devp->debugfs_root)
 265                 return -1;
 266
 267         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 268                                  (void *)devp, &qp_debugfs_fops);
 269         if (de && de->d_inode)
 270                 de->d_inode->i_size = 4096;
 271
 272         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 273                                  (void *)devp, &stag_debugfs_fops);
 274         if (de && de->d_inode)
 275                 de->d_inode->i_size = 4096;
 276         return 0;
 277 }
 278
 279 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 280                                struct c4iw_dev_ucontext *uctx)
 281 {
 282         struct list_head *pos, *nxt;
 283         struct c4iw_qid_list *entry;
 284
 285         mutex_lock(&uctx->lock);
 286         list_for_each_safe(pos, nxt, &uctx->qpids) {
 287                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 288                 list_del_init(&entry->entry);
 289                 if (!(entry->qid & rdev->qpmask))
 290                         c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid,
 291                                           &rdev->resource.qid_fifo_lock);
 292                 kfree(entry);
 293         }
 294
 295         list_for_each_safe(pos, nxt, &uctx->qpids) {
 296                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 297                 list_del_init(&entry->entry);
 298                 kfree(entry);
 299         }
 300         mutex_unlock(&uctx->lock);
 301 }
 302
 303 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 304                             struct c4iw_dev_ucontext *uctx)
 305 {
 306         INIT_LIST_HEAD(&uctx->qpids);
 307         INIT_LIST_HEAD(&uctx->cqids);
 308         mutex_init(&uctx->lock);
 309 }
 310
 311 /* Caller takes care of locking if needed */
 312 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 313 {
 314         int err;
 315
 316         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 317
 318         /*
 319          * qpshift is the number of bits to shift the qpid left in order
 320          * to get the correct address of the doorbell for that qp.
 321          */
 322         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 323         rdev->qpmask = rdev->lldi.udb_density - 1;
 324         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 325         rdev->cqmask = rdev->lldi.ucq_density - 1;
 326         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 327              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 328              "qp qid start %u size %u cq qid start %u size %u\n",
 329              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 330              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 331              rdev->lldi.vr->pbl.start,
 332              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 333              rdev->lldi.vr->rq.size,
 334              rdev->lldi.vr->qp.start,
 335              rdev->lldi.vr->qp.size,
 336              rdev->lldi.vr->cq.start,
 337              rdev->lldi.vr->cq.size);
 338         PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
 339              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 340              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 341              (void *)pci_resource_start(rdev->lldi.pdev, 2),
 342              rdev->lldi.db_reg,
 343              rdev->lldi.gts_reg,
 344              rdev->qpshift, rdev->qpmask,
 345              rdev->cqshift, rdev->cqmask);
 346
 347         if (c4iw_num_stags(rdev) == 0) {
 348                 err = -EINVAL;
 349                 goto err1;
 350         }
 351
 352         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 353         if (err) {
 354                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 355                 goto err1;
 356         }
 357         err = c4iw_pblpool_create(rdev);
 358         if (err) {
 359                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 360                 goto err2;
 361         }
 362         err = c4iw_rqtpool_create(rdev);
 363         if (err) {
 364                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 365                 goto err3;
 366         }
 367         err = c4iw_ocqp_pool_create(rdev);
 368         if (err) {
 369                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 370                 goto err4;
 371         }
 372         return 0;
 373 err4:
 374         c4iw_rqtpool_destroy(rdev);
 375 err3:
 376         c4iw_pblpool_destroy(rdev);
 377 err2:
 378         c4iw_destroy_resource(&rdev->resource);
 379 err1:
 380         return err;
 381 }
 382
 383 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 384 {
 385         c4iw_pblpool_destroy(rdev);
 386         c4iw_rqtpool_destroy(rdev);
 387         c4iw_destroy_resource(&rdev->resource);
 388 }
 389
 390 static void c4iw_remove(struct c4iw_dev *dev)
 391 {
 392         PDBG("%s c4iw_dev %p\n", __func__,  dev);
 393         cancel_delayed_work_sync(&dev->db_drop_task);
 394         list_del(&dev->entry);
 395         if (dev->registered)
 396                 c4iw_unregister_device(dev);
 397         c4iw_rdev_close(&dev->rdev);
 398         idr_destroy(&dev->cqidr);
 399         idr_destroy(&dev->qpidr);
 400         idr_destroy(&dev->mmidr);
 401         iounmap(dev->rdev.oc_mw_kva);
 402         ib_dealloc_device(&dev->ibdev);
 403 }
 404
 405 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 406 {
 407         struct c4iw_dev *devp;
 408         int ret;
 409
 410         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 411         if (!devp) {
 412                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 413                 return NULL;
 414         }
 415         devp->rdev.lldi = *infop;
 416
 417         devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
 418                 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
 419                  roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
 420         devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 421                                                devp->rdev.lldi.vr->ocq.size);
 422
 423         printk(KERN_INFO MOD "ocq memory: "
 424                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 425                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 426                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 427
 428         mutex_lock(&dev_mutex);
 429
 430         ret = c4iw_rdev_open(&devp->rdev);
 431         if (ret) {
 432                 mutex_unlock(&dev_mutex);
 433                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 434                 ib_dealloc_device(&devp->ibdev);
 435                 return NULL;
 436         }
 437
 438         idr_init(&devp->cqidr);
 439         idr_init(&devp->qpidr);
 440         idr_init(&devp->mmidr);
 441         spin_lock_init(&devp->lock);
 442         list_add_tail(&devp->entry, &dev_list);
 443         mutex_unlock(&dev_mutex);
 444
 445         if (c4iw_debugfs_root) {
 446                 devp->debugfs_root = debugfs_create_dir(
 447                                         pci_name(devp->rdev.lldi.pdev),
 448                                         c4iw_debugfs_root);
 449                 setup_debugfs(devp);
 450         }
 451         return devp;
 452 }
 453
 454 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 455 {
 456         struct c4iw_dev *dev;
 457         static int vers_printed;
 458         int i;
 459
 460         if (!vers_printed++)
 461                 printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n",
 462                        DRV_VERSION);
 463
 464         dev = c4iw_alloc(infop);
 465         if (!dev)
 466                 goto out;
 467
 468         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 469              __func__, pci_name(dev->rdev.lldi.pdev),
 470              dev->rdev.lldi.nchan, dev->rdev.lldi.nrxq,
 471              dev->rdev.lldi.ntxq, dev->rdev.lldi.nports);
 472
 473         for (i = 0; i < dev->rdev.lldi.nrxq; i++)
 474                 PDBG("rxqid[%u] %u\n", i, dev->rdev.lldi.rxq_ids[i]);
 475 out:
 476         return dev;
 477 }
 478
 479 static struct sk_buff *t4_pktgl_to_skb(const struct pkt_gl *gl,
 480                                        unsigned int skb_len,
 481                                        unsigned int pull_len)
 482 {
 483         struct sk_buff *skb;
 484         struct skb_shared_info *ssi;
 485
 486         if (gl->tot_len <= 512) {
 487                 skb = alloc_skb(gl->tot_len, GFP_ATOMIC);
 488                 if (unlikely(!skb))
 489                         goto out;
 490                 __skb_put(skb, gl->tot_len);
 491                 skb_copy_to_linear_data(skb, gl->va, gl->tot_len);
 492         } else {
 493                 skb = alloc_skb(skb_len, GFP_ATOMIC);
 494                 if (unlikely(!skb))
 495                         goto out;
 496                 __skb_put(skb, pull_len);
 497                 skb_copy_to_linear_data(skb, gl->va, pull_len);
 498
 499                 ssi = skb_shinfo(skb);
 500                 ssi->frags[0].page = gl->frags[0].page;
 501                 ssi->frags[0].page_offset = gl->frags[0].page_offset + pull_len;
 502                 ssi->frags[0].size = gl->frags[0].size - pull_len;
 503                 if (gl->nfrags > 1)
 504                         memcpy(&ssi->frags[1], &gl->frags[1],
 505                                (gl->nfrags - 1) * sizeof(skb_frag_t));
 506                 ssi->nr_frags = gl->nfrags;
 507
 508                 skb->len = gl->tot_len;
 509                 skb->data_len = skb->len - pull_len;
 510                 skb->truesize += skb->data_len;
 511
 512                 /* Get a reference for the last page, we don't own it */
 513                 get_page(gl->frags[gl->nfrags - 1].page);
 514         }
 515 out:
 516         return skb;
 517 }
 518
 519 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 520                         const struct pkt_gl *gl)
 521 {
 522         struct c4iw_dev *dev = handle;
 523         struct sk_buff *skb;
 524         const struct cpl_act_establish *rpl;
 525         unsigned int opcode;
 526
 527         if (gl == NULL) {
 528                 /* omit RSS and rsp_ctrl at end of descriptor */
 529                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 530
 531                 skb = alloc_skb(256, GFP_ATOMIC);
 532                 if (!skb)
 533                         goto nomem;
 534                 __skb_put(skb, len);
 535                 skb_copy_to_linear_data(skb, &rsp[1], len);
 536         } else if (gl == CXGB4_MSG_AN) {
 537                 const struct rsp_ctrl *rc = (void *)rsp;
 538
 539                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 540                 c4iw_ev_handler(dev, qid);
 541                 return 0;
 542         } else {
 543                 skb = t4_pktgl_to_skb(gl, 128, 128);
 544                 if (unlikely(!skb))
 545                         goto nomem;
 546         }
 547
 548         rpl = cplhdr(skb);
 549         opcode = rpl->ot.opcode;
 550
 551         if (c4iw_handlers[opcode])
 552                 c4iw_handlers[opcode](dev, skb);
 553         else
 554                 printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__,
 555                        opcode);
 556
 557         return 0;
 558 nomem:
 559         return -1;
 560 }
 561
 562 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 563 {
 564         struct c4iw_dev *dev = handle;
 565
 566         PDBG("%s new_state %u\n", __func__, new_state);
 567         switch (new_state) {
 568         case CXGB4_STATE_UP:
 569                 printk(KERN_INFO MOD "%s: Up\n", pci_name(dev->rdev.lldi.pdev));
 570                 if (!dev->registered) {
 571                         int ret;
 572                         ret = c4iw_register_device(dev);
 573                         if (ret)
 574                                 printk(KERN_ERR MOD
 575                                        "%s: RDMA registration failed: %d\n",
 576                                        pci_name(dev->rdev.lldi.pdev), ret);
 577                 }
 578                 break;
 579         case CXGB4_STATE_DOWN:
 580                 printk(KERN_INFO MOD "%s: Down\n",
 581                        pci_name(dev->rdev.lldi.pdev));
 582                 if (dev->registered)
 583                         c4iw_unregister_device(dev);
 584                 break;
 585         case CXGB4_STATE_START_RECOVERY:
 586                 printk(KERN_INFO MOD "%s: Fatal Error\n",
 587                        pci_name(dev->rdev.lldi.pdev));
 588                 if (dev->registered)
 589                         c4iw_unregister_device(dev);
 590                 break;
 591         case CXGB4_STATE_DETACH:
 592                 printk(KERN_INFO MOD "%s: Detach\n",
 593                        pci_name(dev->rdev.lldi.pdev));
 594                 mutex_lock(&dev_mutex);
 595                 c4iw_remove(dev);
 596                 mutex_unlock(&dev_mutex);
 597                 break;
 598         }
 599         return 0;
 600 }
 601
 602 static struct cxgb4_uld_info c4iw_uld_info = {
 603         .name = DRV_NAME,
 604         .add = c4iw_uld_add,
 605         .rx_handler = c4iw_uld_rx_handler,
 606         .state_change = c4iw_uld_state_change,
 607 };
 608
 609 static int __init c4iw_init_module(void)
 610 {
 611         int err;
 612
 613         err = c4iw_cm_init();
 614         if (err)
 615                 return err;
 616
 617         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 618         if (!c4iw_debugfs_root)
 619                 printk(KERN_WARNING MOD
 620                        "could not create debugfs entry, continuing\n");
 621
 622         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
 623
 624         return 0;
 625 }
 626
 627 static void __exit c4iw_exit_module(void)
 628 {
 629         struct c4iw_dev *dev, *tmp;
 630
 631         mutex_lock(&dev_mutex);
 632         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
 633                 c4iw_remove(dev);
 634         }
 635         mutex_unlock(&dev_mutex);
 636         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
 637         c4iw_cm_term();
 638         debugfs_remove_recursive(c4iw_debugfs_root);
 639 }
 640
 641 module_init(c4iw_init_module);
 642 module_exit(c4iw_exit_module);