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cfdda9d7 SW |
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 | ||
cfdda9d7 SW |
507 | mutex_lock(&dev_mutex); |
508 | list_for_each_entry_safe(dev, tmp, &dev_list, entry) { | |
509 | c4iw_remove(dev); | |
510 | } | |
511 | mutex_unlock(&dev_mutex); | |
fd388ce6 | 512 | cxgb4_unregister_uld(CXGB4_ULD_RDMA); |
cfdda9d7 SW |
513 | c4iw_cm_term(); |
514 | debugfs_remove_recursive(c4iw_debugfs_root); | |
515 | } | |
516 | ||
517 | module_init(c4iw_init_module); | |
518 | module_exit(c4iw_exit_module); |