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