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fce8a7bb JM |
1 | /* |
2 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
3 | * redistributing this file, you may do so under either license. | |
4 | * | |
5 | * GPL LICENSE SUMMARY | |
6 | * | |
7 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * BSD LICENSE | |
14 | * | |
15 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * | |
21 | * * Redistributions of source code must retain the above copyright | |
22 | * notice, this list of conditions and the following disclaimer. | |
23 | * * Redistributions in binary form must reproduce the above copy | |
24 | * notice, this list of conditions and the following disclaimer in | |
25 | * the documentation and/or other materials provided with the | |
26 | * distribution. | |
27 | * * Neither the name of Intel Corporation nor the names of its | |
28 | * contributors may be used to endorse or promote products derived | |
29 | * from this software without specific prior written permission. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
36 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
37 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
38 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
39 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
40 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
41 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
42 | * | |
43 | * Intel PCIe NTB Linux driver | |
44 | * | |
45 | * Contact Information: | |
46 | * Jon Mason <jon.mason@intel.com> | |
47 | */ | |
48 | #include <linux/debugfs.h> | |
49 | #include <linux/delay.h> | |
50 | #include <linux/dma-mapping.h> | |
51 | #include <linux/errno.h> | |
52 | #include <linux/export.h> | |
53 | #include <linux/interrupt.h> | |
54 | #include <linux/module.h> | |
55 | #include <linux/pci.h> | |
56 | #include <linux/slab.h> | |
57 | #include <linux/types.h> | |
58 | #include <linux/ntb.h> | |
59 | #include "ntb_hw.h" | |
60 | ||
61 | #define NTB_TRANSPORT_VERSION 1 | |
62 | ||
63 | static int transport_mtu = 0x401E; | |
64 | module_param(transport_mtu, uint, 0644); | |
65 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
66 | ||
67 | static unsigned char max_num_clients = 2; | |
68 | module_param(max_num_clients, byte, 0644); | |
69 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
70 | ||
71 | struct ntb_queue_entry { | |
72 | /* ntb_queue list reference */ | |
73 | struct list_head entry; | |
74 | /* pointers to data to be transfered */ | |
75 | void *cb_data; | |
76 | void *buf; | |
77 | unsigned int len; | |
78 | unsigned int flags; | |
79 | }; | |
80 | ||
81 | struct ntb_transport_qp { | |
82 | struct ntb_transport *transport; | |
83 | struct ntb_device *ndev; | |
84 | void *cb_data; | |
85 | ||
86 | bool client_ready; | |
87 | bool qp_link; | |
88 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ | |
89 | ||
90 | void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
91 | void *data, int len); | |
92 | struct list_head tx_free_q; | |
93 | spinlock_t ntb_tx_free_q_lock; | |
94 | void *tx_mw_begin; | |
95 | void *tx_mw_end; | |
96 | void *tx_offset; | |
97 | ||
98 | void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
99 | void *data, int len); | |
100 | struct tasklet_struct rx_work; | |
101 | struct list_head rx_pend_q; | |
102 | struct list_head rx_free_q; | |
103 | spinlock_t ntb_rx_pend_q_lock; | |
104 | spinlock_t ntb_rx_free_q_lock; | |
105 | void *rx_buff_begin; | |
106 | void *rx_buff_end; | |
107 | void *rx_offset; | |
108 | ||
109 | void (*event_handler) (void *data, int status); | |
110 | struct delayed_work link_work; | |
111 | ||
112 | struct dentry *debugfs_dir; | |
113 | struct dentry *debugfs_stats; | |
114 | ||
115 | /* Stats */ | |
116 | u64 rx_bytes; | |
117 | u64 rx_pkts; | |
118 | u64 rx_ring_empty; | |
119 | u64 rx_err_no_buf; | |
120 | u64 rx_err_oflow; | |
121 | u64 rx_err_ver; | |
122 | u64 tx_bytes; | |
123 | u64 tx_pkts; | |
124 | u64 tx_ring_full; | |
125 | }; | |
126 | ||
127 | struct ntb_transport_mw { | |
128 | size_t size; | |
129 | void *virt_addr; | |
130 | dma_addr_t dma_addr; | |
131 | }; | |
132 | ||
133 | struct ntb_transport_client_dev { | |
134 | struct list_head entry; | |
135 | struct device dev; | |
136 | }; | |
137 | ||
138 | struct ntb_transport { | |
139 | struct list_head entry; | |
140 | struct list_head client_devs; | |
141 | ||
142 | struct ntb_device *ndev; | |
143 | struct ntb_transport_mw mw[NTB_NUM_MW]; | |
144 | struct ntb_transport_qp *qps; | |
145 | unsigned int max_qps; | |
146 | unsigned long qp_bitmap; | |
147 | bool transport_link; | |
148 | struct delayed_work link_work; | |
149 | struct dentry *debugfs_dir; | |
150 | }; | |
151 | ||
152 | enum { | |
153 | DESC_DONE_FLAG = 1 << 0, | |
154 | LINK_DOWN_FLAG = 1 << 1, | |
155 | }; | |
156 | ||
157 | struct ntb_payload_header { | |
158 | u64 ver; | |
159 | unsigned int len; | |
160 | unsigned int flags; | |
161 | }; | |
162 | ||
163 | enum { | |
164 | VERSION = 0, | |
165 | MW0_SZ, | |
166 | MW1_SZ, | |
167 | NUM_QPS, | |
168 | QP_LINKS, | |
169 | MAX_SPAD, | |
170 | }; | |
171 | ||
172 | #define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) | |
173 | #define NTB_QP_DEF_NUM_ENTRIES 100 | |
174 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
175 | ||
176 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
177 | { | |
178 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
179 | } | |
180 | ||
181 | static int ntb_client_probe(struct device *dev) | |
182 | { | |
183 | const struct ntb_client *drv = container_of(dev->driver, | |
184 | struct ntb_client, driver); | |
185 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
186 | int rc = -EINVAL; | |
187 | ||
188 | get_device(dev); | |
189 | if (drv && drv->probe) | |
190 | rc = drv->probe(pdev); | |
191 | if (rc) | |
192 | put_device(dev); | |
193 | ||
194 | return rc; | |
195 | } | |
196 | ||
197 | static int ntb_client_remove(struct device *dev) | |
198 | { | |
199 | const struct ntb_client *drv = container_of(dev->driver, | |
200 | struct ntb_client, driver); | |
201 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
202 | ||
203 | if (drv && drv->remove) | |
204 | drv->remove(pdev); | |
205 | ||
206 | put_device(dev); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | struct bus_type ntb_bus_type = { | |
212 | .name = "ntb_bus", | |
213 | .match = ntb_match_bus, | |
214 | .probe = ntb_client_probe, | |
215 | .remove = ntb_client_remove, | |
216 | }; | |
217 | ||
218 | static LIST_HEAD(ntb_transport_list); | |
219 | ||
78a61ab7 | 220 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
221 | { |
222 | if (list_empty(&ntb_transport_list)) { | |
223 | int rc = bus_register(&ntb_bus_type); | |
224 | if (rc) | |
225 | return rc; | |
226 | } | |
227 | ||
228 | list_add(&nt->entry, &ntb_transport_list); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
78a61ab7 | 233 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
234 | { |
235 | struct ntb_transport_client_dev *client_dev, *cd; | |
236 | ||
237 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
238 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
239 | dev_name(&client_dev->dev)); | |
240 | list_del(&client_dev->entry); | |
241 | device_unregister(&client_dev->dev); | |
242 | } | |
243 | ||
244 | list_del(&nt->entry); | |
245 | ||
246 | if (list_empty(&ntb_transport_list)) | |
247 | bus_unregister(&ntb_bus_type); | |
248 | } | |
249 | ||
250 | static void ntb_client_release(struct device *dev) | |
251 | { | |
252 | struct ntb_transport_client_dev *client_dev; | |
253 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
254 | ||
255 | kfree(client_dev); | |
256 | } | |
257 | ||
258 | /** | |
259 | * ntb_unregister_client_dev - Unregister NTB client device | |
260 | * @device_name: Name of NTB client device | |
261 | * | |
262 | * Unregister an NTB client device with the NTB transport layer | |
263 | */ | |
264 | void ntb_unregister_client_dev(char *device_name) | |
265 | { | |
266 | struct ntb_transport_client_dev *client, *cd; | |
267 | struct ntb_transport *nt; | |
268 | ||
269 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
270 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
271 | if (!strncmp(dev_name(&client->dev), device_name, | |
272 | strlen(device_name))) { | |
273 | list_del(&client->entry); | |
274 | device_unregister(&client->dev); | |
275 | } | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
278 | ||
279 | /** | |
280 | * ntb_register_client_dev - Register NTB client device | |
281 | * @device_name: Name of NTB client device | |
282 | * | |
283 | * Register an NTB client device with the NTB transport layer | |
284 | */ | |
285 | int ntb_register_client_dev(char *device_name) | |
286 | { | |
287 | struct ntb_transport_client_dev *client_dev; | |
288 | struct ntb_transport *nt; | |
289 | int rc; | |
290 | ||
8222b402 JM |
291 | if (list_empty(&ntb_transport_list)) |
292 | return -ENODEV; | |
293 | ||
fce8a7bb JM |
294 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
295 | struct device *dev; | |
296 | ||
297 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
298 | GFP_KERNEL); | |
299 | if (!client_dev) { | |
300 | rc = -ENOMEM; | |
301 | goto err; | |
302 | } | |
303 | ||
304 | dev = &client_dev->dev; | |
305 | ||
306 | /* setup and register client devices */ | |
307 | dev_set_name(dev, "%s", device_name); | |
308 | dev->bus = &ntb_bus_type; | |
309 | dev->release = ntb_client_release; | |
310 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
311 | ||
312 | rc = device_register(dev); | |
313 | if (rc) { | |
314 | kfree(client_dev); | |
315 | goto err; | |
316 | } | |
317 | ||
318 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
319 | } | |
320 | ||
321 | return 0; | |
322 | ||
323 | err: | |
324 | ntb_unregister_client_dev(device_name); | |
325 | ||
326 | return rc; | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
329 | ||
330 | /** | |
331 | * ntb_register_client - Register NTB client driver | |
332 | * @drv: NTB client driver to be registered | |
333 | * | |
334 | * Register an NTB client driver with the NTB transport layer | |
335 | * | |
336 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
337 | */ | |
338 | int ntb_register_client(struct ntb_client *drv) | |
339 | { | |
340 | drv->driver.bus = &ntb_bus_type; | |
341 | ||
8222b402 JM |
342 | if (list_empty(&ntb_transport_list)) |
343 | return -ENODEV; | |
344 | ||
fce8a7bb JM |
345 | return driver_register(&drv->driver); |
346 | } | |
347 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
348 | ||
349 | /** | |
350 | * ntb_unregister_client - Unregister NTB client driver | |
351 | * @drv: NTB client driver to be unregistered | |
352 | * | |
353 | * Unregister an NTB client driver with the NTB transport layer | |
354 | * | |
355 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
356 | */ | |
357 | void ntb_unregister_client(struct ntb_client *drv) | |
358 | { | |
359 | driver_unregister(&drv->driver); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
362 | ||
363 | static int debugfs_open(struct inode *inode, struct file *filp) | |
364 | { | |
365 | filp->private_data = inode->i_private; | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, | |
370 | loff_t *offp) | |
371 | { | |
372 | struct ntb_transport_qp *qp; | |
373 | char buf[1024]; | |
374 | ssize_t ret, out_offset, out_count; | |
375 | ||
376 | out_count = 1024; | |
377 | ||
378 | qp = filp->private_data; | |
379 | out_offset = 0; | |
380 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
381 | "NTB QP stats\n"); | |
382 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
383 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
384 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
385 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
386 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
387 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
388 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
389 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
390 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
391 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
392 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
393 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
394 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
395 | "rx_buff_begin - %p\n", qp->rx_buff_begin); | |
396 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
397 | "rx_offset - \t%p\n", qp->rx_offset); | |
398 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
399 | "rx_buff_end - \t%p\n", qp->rx_buff_end); | |
400 | ||
401 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
402 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
403 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
404 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
405 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
406 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
407 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
408 | "tx_mw_begin - \t%p\n", qp->tx_mw_begin); | |
409 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
410 | "tx_offset - \t%p\n", qp->tx_offset); | |
411 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
412 | "tx_mw_end - \t%p\n", qp->tx_mw_end); | |
413 | ||
414 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
415 | "QP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? | |
416 | "Up" : "Down"); | |
417 | ||
418 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | static const struct file_operations ntb_qp_debugfs_stats = { | |
423 | .owner = THIS_MODULE, | |
424 | .open = debugfs_open, | |
425 | .read = debugfs_read, | |
426 | }; | |
427 | ||
428 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
429 | struct list_head *list) | |
430 | { | |
431 | unsigned long flags; | |
432 | ||
433 | spin_lock_irqsave(lock, flags); | |
434 | list_add_tail(entry, list); | |
435 | spin_unlock_irqrestore(lock, flags); | |
436 | } | |
437 | ||
438 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
439 | struct list_head *list) | |
440 | { | |
441 | struct ntb_queue_entry *entry; | |
442 | unsigned long flags; | |
443 | ||
444 | spin_lock_irqsave(lock, flags); | |
445 | if (list_empty(list)) { | |
446 | entry = NULL; | |
447 | goto out; | |
448 | } | |
449 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
450 | list_del(&entry->entry); | |
451 | out: | |
452 | spin_unlock_irqrestore(lock, flags); | |
453 | ||
454 | return entry; | |
455 | } | |
456 | ||
457 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
458 | unsigned int qp_num) | |
459 | { | |
460 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
461 | unsigned int size, num_qps_mw; | |
462 | u8 mw_num = QP_TO_MW(qp_num); | |
463 | ||
464 | WARN_ON(nt->mw[mw_num].virt_addr == 0); | |
465 | ||
466 | if (nt->max_qps % NTB_NUM_MW && !mw_num) | |
467 | num_qps_mw = nt->max_qps / NTB_NUM_MW + | |
468 | (nt->max_qps % NTB_NUM_MW - mw_num); | |
469 | else | |
470 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
471 | ||
472 | size = nt->mw[mw_num].size / num_qps_mw; | |
473 | ||
474 | qp->rx_buff_begin = nt->mw[mw_num].virt_addr + | |
475 | (qp_num / NTB_NUM_MW * size); | |
476 | qp->rx_buff_end = qp->rx_buff_begin + size; | |
477 | qp->rx_offset = qp->rx_buff_begin; | |
478 | ||
479 | qp->tx_mw_begin = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
480 | (qp_num / NTB_NUM_MW * size); | |
481 | qp->tx_mw_end = qp->tx_mw_begin + size; | |
482 | qp->tx_offset = qp->tx_mw_begin; | |
483 | ||
484 | qp->rx_pkts = 0; | |
485 | qp->tx_pkts = 0; | |
486 | } | |
487 | ||
488 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
489 | { | |
490 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
491 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
492 | void *offset; | |
493 | ||
494 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
495 | mw->size = ALIGN(size, 4096); | |
496 | ||
497 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
498 | GFP_KERNEL); | |
499 | if (!mw->virt_addr) { | |
500 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
501 | (int) mw->size); | |
502 | return -ENOMEM; | |
503 | } | |
504 | ||
505 | /* setup the hdr offsets with 0's */ | |
506 | for (offset = mw->virt_addr + transport_mtu - | |
507 | sizeof(struct ntb_payload_header); | |
508 | offset < mw->virt_addr + size; offset += transport_mtu) | |
509 | memset(offset, 0, sizeof(struct ntb_payload_header)); | |
510 | ||
511 | /* Notify HW the memory location of the receive buffer */ | |
512 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) | |
518 | { | |
519 | struct ntb_transport *nt = qp->transport; | |
520 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
521 | ||
522 | if (qp->qp_link == NTB_LINK_DOWN) { | |
523 | cancel_delayed_work_sync(&qp->link_work); | |
524 | return; | |
525 | } | |
526 | ||
527 | if (qp->event_handler) | |
528 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
529 | ||
530 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
531 | qp->qp_link = NTB_LINK_DOWN; | |
532 | ||
533 | if (nt->transport_link == NTB_LINK_UP) | |
534 | schedule_delayed_work(&qp->link_work, | |
535 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
536 | } | |
537 | ||
538 | static void ntb_transport_conn_down(struct ntb_transport *nt) | |
539 | { | |
540 | int i; | |
541 | ||
542 | if (nt->transport_link == NTB_LINK_DOWN) | |
543 | cancel_delayed_work_sync(&nt->link_work); | |
544 | else | |
545 | nt->transport_link = NTB_LINK_DOWN; | |
546 | ||
547 | /* Pass along the info to any clients */ | |
548 | for (i = 0; i < nt->max_qps; i++) | |
549 | if (!test_bit(i, &nt->qp_bitmap)) | |
550 | ntb_qp_link_down(&nt->qps[i]); | |
551 | ||
552 | /* The scratchpad registers keep the values if the remote side | |
553 | * goes down, blast them now to give them a sane value the next | |
554 | * time they are accessed | |
555 | */ | |
556 | for (i = 0; i < MAX_SPAD; i++) | |
557 | ntb_write_local_spad(nt->ndev, i, 0); | |
558 | } | |
559 | ||
560 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
561 | { | |
562 | struct ntb_transport *nt = data; | |
563 | ||
564 | switch (event) { | |
565 | case NTB_EVENT_HW_LINK_UP: | |
566 | schedule_delayed_work(&nt->link_work, 0); | |
567 | break; | |
568 | case NTB_EVENT_HW_LINK_DOWN: | |
569 | ntb_transport_conn_down(nt); | |
570 | break; | |
571 | default: | |
572 | BUG(); | |
573 | } | |
574 | } | |
575 | ||
576 | static void ntb_transport_link_work(struct work_struct *work) | |
577 | { | |
578 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
579 | link_work.work); | |
580 | struct ntb_device *ndev = nt->ndev; | |
581 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
582 | u32 val; | |
583 | int rc, i; | |
584 | ||
585 | /* send the local info */ | |
586 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); | |
587 | if (rc) { | |
588 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
589 | 0, VERSION); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0)); | |
594 | if (rc) { | |
595 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
596 | (u32) ntb_get_mw_size(ndev, 0), MW0_SZ); | |
597 | goto out; | |
598 | } | |
599 | ||
600 | rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1)); | |
601 | if (rc) { | |
602 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
603 | (u32) ntb_get_mw_size(ndev, 1), MW1_SZ); | |
604 | goto out; | |
605 | } | |
606 | ||
607 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
608 | if (rc) { | |
609 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
610 | nt->max_qps, NUM_QPS); | |
611 | goto out; | |
612 | } | |
613 | ||
614 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
615 | if (rc) { | |
616 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
617 | goto out; | |
618 | } | |
619 | ||
620 | rc = ntb_write_remote_spad(ndev, QP_LINKS, val); | |
621 | if (rc) { | |
622 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
623 | val, QP_LINKS); | |
624 | goto out; | |
625 | } | |
626 | ||
627 | /* Query the remote side for its info */ | |
628 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
629 | if (rc) { | |
630 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
631 | goto out; | |
632 | } | |
633 | ||
634 | if (val != NTB_TRANSPORT_VERSION) | |
635 | goto out; | |
636 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
637 | ||
638 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
639 | if (rc) { | |
640 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
641 | goto out; | |
642 | } | |
643 | ||
644 | if (val != nt->max_qps) | |
645 | goto out; | |
646 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
647 | ||
648 | rc = ntb_read_remote_spad(ndev, MW0_SZ, &val); | |
649 | if (rc) { | |
650 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ); | |
651 | goto out; | |
652 | } | |
653 | ||
654 | if (!val) | |
655 | goto out; | |
656 | dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val); | |
657 | ||
658 | rc = ntb_set_mw(nt, 0, val); | |
659 | if (rc) | |
660 | goto out; | |
661 | ||
662 | rc = ntb_read_remote_spad(ndev, MW1_SZ, &val); | |
663 | if (rc) { | |
664 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ); | |
665 | goto out; | |
666 | } | |
667 | ||
668 | if (!val) | |
669 | goto out; | |
670 | dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val); | |
671 | ||
672 | rc = ntb_set_mw(nt, 1, val); | |
673 | if (rc) | |
674 | goto out; | |
675 | ||
676 | nt->transport_link = NTB_LINK_UP; | |
677 | ||
678 | for (i = 0; i < nt->max_qps; i++) { | |
679 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
680 | ||
681 | ntb_transport_setup_qp_mw(nt, i); | |
682 | ||
683 | if (qp->client_ready == NTB_LINK_UP) | |
684 | schedule_delayed_work(&qp->link_work, 0); | |
685 | } | |
686 | ||
687 | return; | |
688 | ||
689 | out: | |
690 | if (ntb_hw_link_status(ndev)) | |
691 | schedule_delayed_work(&nt->link_work, | |
692 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
693 | } | |
694 | ||
695 | static void ntb_qp_link_work(struct work_struct *work) | |
696 | { | |
697 | struct ntb_transport_qp *qp = container_of(work, | |
698 | struct ntb_transport_qp, | |
699 | link_work.work); | |
700 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
701 | struct ntb_transport *nt = qp->transport; | |
702 | int rc, val; | |
703 | ||
704 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
705 | ||
706 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
707 | if (rc) { | |
708 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
709 | return; | |
710 | } | |
711 | ||
712 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
713 | if (rc) | |
714 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
715 | val | 1 << qp->qp_num, QP_LINKS); | |
716 | ||
717 | /* query remote spad for qp ready bits */ | |
718 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
719 | if (rc) | |
720 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
721 | ||
722 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
723 | ||
724 | /* See if the remote side is up */ | |
725 | if (1 << qp->qp_num & val) { | |
726 | qp->qp_link = NTB_LINK_UP; | |
727 | ||
728 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
729 | if (qp->event_handler) | |
730 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
731 | } else if (nt->transport_link == NTB_LINK_UP) | |
732 | schedule_delayed_work(&qp->link_work, | |
733 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
734 | } | |
735 | ||
736 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
737 | unsigned int qp_num) | |
738 | { | |
739 | struct ntb_transport_qp *qp; | |
740 | ||
741 | qp = &nt->qps[qp_num]; | |
742 | qp->qp_num = qp_num; | |
743 | qp->transport = nt; | |
744 | qp->ndev = nt->ndev; | |
745 | qp->qp_link = NTB_LINK_DOWN; | |
746 | qp->client_ready = NTB_LINK_DOWN; | |
747 | qp->event_handler = NULL; | |
748 | ||
749 | if (nt->debugfs_dir) { | |
750 | char debugfs_name[4]; | |
751 | ||
752 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
753 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
754 | nt->debugfs_dir); | |
755 | ||
756 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
757 | qp->debugfs_dir, qp, | |
758 | &ntb_qp_debugfs_stats); | |
759 | } | |
760 | ||
761 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
762 | ||
763 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
764 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
765 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
766 | ||
767 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
768 | INIT_LIST_HEAD(&qp->rx_free_q); | |
769 | INIT_LIST_HEAD(&qp->tx_free_q); | |
770 | } | |
771 | ||
772 | int ntb_transport_init(struct pci_dev *pdev) | |
773 | { | |
774 | struct ntb_transport *nt; | |
775 | int rc, i; | |
776 | ||
777 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
778 | if (!nt) | |
779 | return -ENOMEM; | |
780 | ||
781 | if (debugfs_initialized()) | |
782 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
783 | else | |
784 | nt->debugfs_dir = NULL; | |
785 | ||
786 | nt->ndev = ntb_register_transport(pdev, nt); | |
787 | if (!nt->ndev) { | |
788 | rc = -EIO; | |
789 | goto err; | |
790 | } | |
791 | ||
792 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
793 | ||
794 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
795 | GFP_KERNEL); | |
796 | if (!nt->qps) { | |
797 | rc = -ENOMEM; | |
798 | goto err1; | |
799 | } | |
800 | ||
801 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
802 | ||
803 | for (i = 0; i < nt->max_qps; i++) | |
804 | ntb_transport_init_queue(nt, i); | |
805 | ||
806 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
807 | ||
808 | rc = ntb_register_event_callback(nt->ndev, | |
809 | ntb_transport_event_callback); | |
810 | if (rc) | |
811 | goto err2; | |
812 | ||
813 | INIT_LIST_HEAD(&nt->client_devs); | |
814 | rc = ntb_bus_init(nt); | |
815 | if (rc) | |
816 | goto err3; | |
817 | ||
818 | if (ntb_hw_link_status(nt->ndev)) | |
819 | schedule_delayed_work(&nt->link_work, 0); | |
820 | ||
821 | return 0; | |
822 | ||
823 | err3: | |
824 | ntb_unregister_event_callback(nt->ndev); | |
825 | err2: | |
826 | kfree(nt->qps); | |
827 | err1: | |
828 | ntb_unregister_transport(nt->ndev); | |
829 | err: | |
830 | debugfs_remove_recursive(nt->debugfs_dir); | |
831 | kfree(nt); | |
832 | return rc; | |
833 | } | |
834 | ||
835 | void ntb_transport_free(void *transport) | |
836 | { | |
837 | struct ntb_transport *nt = transport; | |
838 | struct pci_dev *pdev; | |
839 | int i; | |
840 | ||
841 | nt->transport_link = NTB_LINK_DOWN; | |
842 | ||
843 | /* verify that all the qp's are freed */ | |
844 | for (i = 0; i < nt->max_qps; i++) | |
845 | if (!test_bit(i, &nt->qp_bitmap)) | |
846 | ntb_transport_free_queue(&nt->qps[i]); | |
847 | ||
848 | ntb_bus_remove(nt); | |
849 | ||
850 | cancel_delayed_work_sync(&nt->link_work); | |
851 | ||
852 | debugfs_remove_recursive(nt->debugfs_dir); | |
853 | ||
854 | ntb_unregister_event_callback(nt->ndev); | |
855 | ||
856 | pdev = ntb_query_pdev(nt->ndev); | |
857 | ||
858 | for (i = 0; i < NTB_NUM_MW; i++) | |
859 | if (nt->mw[i].virt_addr) | |
860 | dma_free_coherent(&pdev->dev, nt->mw[i].size, | |
861 | nt->mw[i].virt_addr, | |
862 | nt->mw[i].dma_addr); | |
863 | ||
864 | kfree(nt->qps); | |
865 | ntb_unregister_transport(nt->ndev); | |
866 | kfree(nt); | |
867 | } | |
868 | ||
869 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
870 | struct ntb_queue_entry *entry, void *offset) | |
871 | { | |
872 | ||
873 | struct ntb_payload_header *hdr; | |
874 | ||
875 | BUG_ON(offset < qp->rx_buff_begin || | |
876 | offset + transport_mtu >= qp->rx_buff_end); | |
877 | ||
878 | hdr = offset + transport_mtu - sizeof(struct ntb_payload_header); | |
879 | entry->len = hdr->len; | |
880 | ||
881 | memcpy(entry->buf, offset, entry->len); | |
882 | ||
883 | /* Ensure that the data is fully copied out before clearing the flag */ | |
884 | wmb(); | |
885 | hdr->flags = 0; | |
886 | ||
887 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
888 | qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len); | |
889 | ||
890 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
891 | } | |
892 | ||
893 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
894 | { | |
895 | struct ntb_payload_header *hdr; | |
896 | struct ntb_queue_entry *entry; | |
897 | void *offset; | |
898 | ||
899 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
900 | if (!entry) { | |
901 | hdr = offset + transport_mtu - | |
902 | sizeof(struct ntb_payload_header); | |
903 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
904 | "no buffer - HDR ver %llu, len %d, flags %x\n", | |
905 | hdr->ver, hdr->len, hdr->flags); | |
906 | qp->rx_err_no_buf++; | |
907 | return -ENOMEM; | |
908 | } | |
909 | ||
910 | offset = qp->rx_offset; | |
911 | hdr = offset + transport_mtu - sizeof(struct ntb_payload_header); | |
912 | ||
913 | if (!(hdr->flags & DESC_DONE_FLAG)) { | |
914 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
915 | &qp->rx_pend_q); | |
916 | qp->rx_ring_empty++; | |
917 | return -EAGAIN; | |
918 | } | |
919 | ||
920 | if (hdr->ver != qp->rx_pkts) { | |
921 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
922 | "qp %d: version mismatch, expected %llu - got %llu\n", | |
923 | qp->qp_num, qp->rx_pkts, hdr->ver); | |
924 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
925 | &qp->rx_pend_q); | |
926 | qp->rx_err_ver++; | |
927 | return -EIO; | |
928 | } | |
929 | ||
930 | if (hdr->flags & LINK_DOWN_FLAG) { | |
931 | ntb_qp_link_down(qp); | |
932 | ||
933 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
934 | &qp->rx_pend_q); | |
935 | ||
936 | /* Ensure that the data is fully copied out before clearing the | |
937 | * done flag | |
938 | */ | |
939 | wmb(); | |
940 | hdr->flags = 0; | |
941 | goto out; | |
942 | } | |
943 | ||
944 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
945 | "rx offset %p, ver %llu - %d payload received, buf size %d\n", | |
946 | qp->rx_offset, hdr->ver, hdr->len, entry->len); | |
947 | ||
948 | if (hdr->len <= entry->len) | |
949 | ntb_rx_copy_task(qp, entry, offset); | |
950 | else { | |
951 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
952 | &qp->rx_pend_q); | |
953 | ||
954 | /* Ensure that the data is fully copied out before clearing the | |
955 | * done flag | |
956 | */ | |
957 | wmb(); | |
958 | hdr->flags = 0; | |
959 | qp->rx_err_oflow++; | |
960 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
961 | "RX overflow! Wanted %d got %d\n", | |
962 | hdr->len, entry->len); | |
963 | } | |
964 | ||
965 | qp->rx_bytes += hdr->len; | |
966 | qp->rx_pkts++; | |
967 | ||
968 | out: | |
969 | qp->rx_offset += transport_mtu; | |
970 | if (qp->rx_offset + transport_mtu >= qp->rx_buff_end) | |
971 | qp->rx_offset = qp->rx_buff_begin; | |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
976 | static void ntb_transport_rx(unsigned long data) | |
977 | { | |
978 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
979 | int rc; | |
980 | ||
981 | do { | |
982 | rc = ntb_process_rxc(qp); | |
983 | } while (!rc); | |
984 | } | |
985 | ||
986 | static void ntb_transport_rxc_db(void *data, int db_num) | |
987 | { | |
988 | struct ntb_transport_qp *qp = data; | |
989 | ||
990 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
991 | __func__, db_num); | |
992 | ||
993 | tasklet_schedule(&qp->rx_work); | |
994 | } | |
995 | ||
996 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
997 | struct ntb_queue_entry *entry, | |
998 | void *offset) | |
999 | { | |
1000 | struct ntb_payload_header *hdr; | |
1001 | ||
1002 | BUG_ON(offset < qp->tx_mw_begin || | |
1003 | offset + transport_mtu >= qp->tx_mw_end); | |
1004 | ||
1005 | memcpy_toio(offset, entry->buf, entry->len); | |
1006 | ||
1007 | hdr = offset + transport_mtu - sizeof(struct ntb_payload_header); | |
1008 | hdr->len = entry->len; | |
1009 | hdr->ver = qp->tx_pkts; | |
1010 | ||
1011 | /* Ensure that the data is fully copied out before setting the flag */ | |
1012 | mmiowb(); | |
1013 | hdr->flags = entry->flags | DESC_DONE_FLAG; | |
1014 | ||
1015 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1016 | ||
1017 | /* The entry length can only be zero if the packet is intended to be a | |
1018 | * "link down" or similar. Since no payload is being sent in these | |
1019 | * cases, there is nothing to add to the completion queue. | |
1020 | */ | |
1021 | if (entry->len > 0) { | |
1022 | qp->tx_bytes += entry->len; | |
1023 | ||
1024 | if (qp->tx_handler) | |
1025 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1026 | entry->len); | |
1027 | } | |
1028 | ||
1029 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1030 | } | |
1031 | ||
1032 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1033 | struct ntb_queue_entry *entry) | |
1034 | { | |
1035 | struct ntb_payload_header *hdr; | |
1036 | void *offset; | |
1037 | ||
1038 | offset = qp->tx_offset; | |
1039 | hdr = offset + transport_mtu - sizeof(struct ntb_payload_header); | |
1040 | ||
1041 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %p, entry len %d flags %x buff %p\n", | |
1042 | qp->tx_pkts, offset, qp->tx_offset, entry->len, entry->flags, | |
1043 | entry->buf); | |
1044 | if (hdr->flags) { | |
1045 | qp->tx_ring_full++; | |
1046 | return -EAGAIN; | |
1047 | } | |
1048 | ||
1049 | if (entry->len > transport_mtu - sizeof(struct ntb_payload_header)) { | |
1050 | if (qp->tx_handler) | |
1051 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1052 | ||
1053 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1054 | &qp->tx_free_q); | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | ntb_tx_copy_task(qp, entry, offset); | |
1059 | ||
1060 | qp->tx_offset += transport_mtu; | |
1061 | if (qp->tx_offset + transport_mtu >= qp->tx_mw_end) | |
1062 | qp->tx_offset = qp->tx_mw_begin; | |
1063 | ||
1064 | qp->tx_pkts++; | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1070 | { | |
1071 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1072 | struct ntb_queue_entry *entry; | |
1073 | int i, rc; | |
1074 | ||
1075 | if (qp->qp_link == NTB_LINK_DOWN) | |
1076 | return; | |
1077 | ||
1078 | qp->qp_link = NTB_LINK_DOWN; | |
1079 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1080 | ||
1081 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
1082 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, | |
1083 | &qp->tx_free_q); | |
1084 | if (entry) | |
1085 | break; | |
1086 | msleep(100); | |
1087 | } | |
1088 | ||
1089 | if (!entry) | |
1090 | return; | |
1091 | ||
1092 | entry->cb_data = NULL; | |
1093 | entry->buf = NULL; | |
1094 | entry->len = 0; | |
1095 | entry->flags = LINK_DOWN_FLAG; | |
1096 | ||
1097 | rc = ntb_process_tx(qp, entry); | |
1098 | if (rc) | |
1099 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1100 | qp->qp_num); | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1105 | * @rx_handler: receive callback function | |
1106 | * @tx_handler: transmit callback function | |
1107 | * @event_handler: event callback function | |
1108 | * | |
1109 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1110 | * routine for both transmit and receive. The receive callback routine will be | |
1111 | * used to pass up data when the transport has received it on the queue. The | |
1112 | * transmit callback routine will be called when the transport has completed the | |
1113 | * transmission of the data on the queue and the data is ready to be freed. | |
1114 | * | |
1115 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1116 | */ | |
1117 | struct ntb_transport_qp * | |
1118 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1119 | const struct ntb_queue_handlers *handlers) | |
1120 | { | |
1121 | struct ntb_queue_entry *entry; | |
1122 | struct ntb_transport_qp *qp; | |
1123 | struct ntb_transport *nt; | |
1124 | unsigned int free_queue; | |
1125 | int rc, i; | |
1126 | ||
1127 | nt = ntb_find_transport(pdev); | |
1128 | if (!nt) | |
1129 | goto err; | |
1130 | ||
1131 | free_queue = ffs(nt->qp_bitmap); | |
1132 | if (!free_queue) | |
1133 | goto err; | |
1134 | ||
1135 | /* decrement free_queue to make it zero based */ | |
1136 | free_queue--; | |
1137 | ||
1138 | clear_bit(free_queue, &nt->qp_bitmap); | |
1139 | ||
1140 | qp = &nt->qps[free_queue]; | |
1141 | qp->cb_data = data; | |
1142 | qp->rx_handler = handlers->rx_handler; | |
1143 | qp->tx_handler = handlers->tx_handler; | |
1144 | qp->event_handler = handlers->event_handler; | |
1145 | ||
1146 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1147 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1148 | if (!entry) | |
1149 | goto err1; | |
1150 | ||
1151 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
1152 | &qp->rx_free_q); | |
1153 | } | |
1154 | ||
1155 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1156 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1157 | if (!entry) | |
1158 | goto err2; | |
1159 | ||
1160 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1161 | &qp->tx_free_q); | |
1162 | } | |
1163 | ||
1164 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1165 | ||
1166 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1167 | ntb_transport_rxc_db); | |
1168 | if (rc) | |
1169 | goto err3; | |
1170 | ||
1171 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1172 | ||
1173 | return qp; | |
1174 | ||
1175 | err3: | |
1176 | tasklet_disable(&qp->rx_work); | |
1177 | err2: | |
1178 | while ((entry = | |
1179 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1180 | kfree(entry); | |
1181 | err1: | |
1182 | while ((entry = | |
1183 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1184 | kfree(entry); | |
1185 | set_bit(free_queue, &nt->qp_bitmap); | |
1186 | err: | |
1187 | return NULL; | |
1188 | } | |
1189 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1190 | ||
1191 | /** | |
1192 | * ntb_transport_free_queue - Frees NTB transport queue | |
1193 | * @qp: NTB queue to be freed | |
1194 | * | |
1195 | * Frees NTB transport queue | |
1196 | */ | |
1197 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1198 | { | |
1199 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1200 | struct ntb_queue_entry *entry; | |
1201 | ||
1202 | if (!qp) | |
1203 | return; | |
1204 | ||
1205 | cancel_delayed_work_sync(&qp->link_work); | |
1206 | ||
1207 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1208 | tasklet_disable(&qp->rx_work); | |
1209 | ||
1210 | while ((entry = | |
1211 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1212 | kfree(entry); | |
1213 | ||
1214 | while ((entry = | |
1215 | ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { | |
1216 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); | |
1217 | kfree(entry); | |
1218 | } | |
1219 | ||
1220 | while ((entry = | |
1221 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1222 | kfree(entry); | |
1223 | ||
1224 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1225 | ||
1226 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1229 | ||
1230 | /** | |
1231 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1232 | * @qp: NTB queue to be freed | |
1233 | * @len: pointer to variable to write enqueued buffers length | |
1234 | * | |
1235 | * Dequeues unused buffers from receive queue. Should only be used during | |
1236 | * shutdown of qp. | |
1237 | * | |
1238 | * RETURNS: NULL error value on error, or void* for success. | |
1239 | */ | |
1240 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1241 | { | |
1242 | struct ntb_queue_entry *entry; | |
1243 | void *buf; | |
1244 | ||
1245 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1246 | return NULL; | |
1247 | ||
1248 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1249 | if (!entry) | |
1250 | return NULL; | |
1251 | ||
1252 | buf = entry->cb_data; | |
1253 | *len = entry->len; | |
1254 | ||
1255 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
1256 | &qp->rx_free_q); | |
1257 | ||
1258 | return buf; | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1261 | ||
1262 | /** | |
1263 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1264 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1265 | * @cb: per buffer pointer for callback function to use | |
1266 | * @data: pointer to data buffer that incoming packets will be copied into | |
1267 | * @len: length of the data buffer | |
1268 | * | |
1269 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1270 | * payload can be received into. | |
1271 | * | |
1272 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1273 | */ | |
1274 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1275 | unsigned int len) | |
1276 | { | |
1277 | struct ntb_queue_entry *entry; | |
1278 | ||
1279 | if (!qp) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1283 | if (!entry) | |
1284 | return -ENOMEM; | |
1285 | ||
1286 | entry->cb_data = cb; | |
1287 | entry->buf = data; | |
1288 | entry->len = len; | |
1289 | ||
1290 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
1291 | &qp->rx_pend_q); | |
1292 | ||
1293 | return 0; | |
1294 | } | |
1295 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1296 | ||
1297 | /** | |
1298 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1299 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1300 | * @cb: per buffer pointer for callback function to use | |
1301 | * @data: pointer to data buffer that will be sent | |
1302 | * @len: length of the data buffer | |
1303 | * | |
1304 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1305 | * payload will be transmitted. This assumes that a lock is behing held to | |
1306 | * serialize access to the qp. | |
1307 | * | |
1308 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1309 | */ | |
1310 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1311 | unsigned int len) | |
1312 | { | |
1313 | struct ntb_queue_entry *entry; | |
1314 | int rc; | |
1315 | ||
1316 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1320 | if (!entry) | |
1321 | return -ENOMEM; | |
1322 | ||
1323 | entry->cb_data = cb; | |
1324 | entry->buf = data; | |
1325 | entry->len = len; | |
1326 | entry->flags = 0; | |
1327 | ||
1328 | rc = ntb_process_tx(qp, entry); | |
1329 | if (rc) | |
1330 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1331 | &qp->tx_free_q); | |
1332 | ||
1333 | return rc; | |
1334 | } | |
1335 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1336 | ||
1337 | /** | |
1338 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1339 | * @qp: NTB transport layer queue to be enabled | |
1340 | * | |
1341 | * Notify NTB transport layer of client readiness to use queue | |
1342 | */ | |
1343 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1344 | { | |
1345 | if (!qp) | |
1346 | return; | |
1347 | ||
1348 | qp->client_ready = NTB_LINK_UP; | |
1349 | ||
1350 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1351 | schedule_delayed_work(&qp->link_work, 0); | |
1352 | } | |
1353 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1354 | ||
1355 | /** | |
1356 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1357 | * @qp: NTB transport layer queue to be disabled | |
1358 | * | |
1359 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1360 | * transport queue specified. It is the client's responsibility to ensure all | |
1361 | * entries on queue are purged or otherwise handled appropraitely. | |
1362 | */ | |
1363 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1364 | { | |
1365 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1366 | int rc, val; | |
1367 | ||
1368 | if (!qp) | |
1369 | return; | |
1370 | ||
1371 | qp->client_ready = NTB_LINK_DOWN; | |
1372 | ||
1373 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1374 | if (rc) { | |
1375 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1376 | return; | |
1377 | } | |
1378 | ||
1379 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1380 | val & ~(1 << qp->qp_num)); | |
1381 | if (rc) | |
1382 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1383 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1384 | ||
1385 | if (qp->qp_link == NTB_LINK_UP) | |
1386 | ntb_send_link_down(qp); | |
1387 | else | |
1388 | cancel_delayed_work_sync(&qp->link_work); | |
1389 | } | |
1390 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1391 | ||
1392 | /** | |
1393 | * ntb_transport_link_query - Query transport link state | |
1394 | * @qp: NTB transport layer queue to be queried | |
1395 | * | |
1396 | * Query connectivity to the remote system of the NTB transport queue | |
1397 | * | |
1398 | * RETURNS: true for link up or false for link down | |
1399 | */ | |
1400 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1401 | { | |
1402 | return qp->qp_link == NTB_LINK_UP; | |
1403 | } | |
1404 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1405 | ||
1406 | /** | |
1407 | * ntb_transport_qp_num - Query the qp number | |
1408 | * @qp: NTB transport layer queue to be queried | |
1409 | * | |
1410 | * Query qp number of the NTB transport queue | |
1411 | * | |
1412 | * RETURNS: a zero based number specifying the qp number | |
1413 | */ | |
1414 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1415 | { | |
1416 | return qp->qp_num; | |
1417 | } | |
1418 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1419 | ||
1420 | /** | |
1421 | * ntb_transport_max_size - Query the max payload size of a qp | |
1422 | * @qp: NTB transport layer queue to be queried | |
1423 | * | |
1424 | * Query the maximum payload size permissible on the given qp | |
1425 | * | |
1426 | * RETURNS: the max payload size of a qp | |
1427 | */ | |
1428 | unsigned int | |
1429 | ntb_transport_max_size(__attribute__((unused)) struct ntb_transport_qp *qp) | |
1430 | { | |
1431 | return transport_mtu - sizeof(struct ntb_payload_header); | |
1432 | } | |
1433 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |