]>
Commit | Line | Data |
---|---|---|
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 | ||
ef114ed5 | 63 | static unsigned int transport_mtu = 0x401E; |
fce8a7bb JM |
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; | |
ef114ed5 | 97 | unsigned int tx_max_frame; |
fce8a7bb JM |
98 | |
99 | void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
100 | void *data, int len); | |
101 | struct tasklet_struct rx_work; | |
102 | struct list_head rx_pend_q; | |
103 | struct list_head rx_free_q; | |
104 | spinlock_t ntb_rx_pend_q_lock; | |
105 | spinlock_t ntb_rx_free_q_lock; | |
106 | void *rx_buff_begin; | |
107 | void *rx_buff_end; | |
108 | void *rx_offset; | |
ef114ed5 | 109 | unsigned int rx_max_frame; |
fce8a7bb JM |
110 | |
111 | void (*event_handler) (void *data, int status); | |
112 | struct delayed_work link_work; | |
113 | ||
114 | struct dentry *debugfs_dir; | |
115 | struct dentry *debugfs_stats; | |
116 | ||
117 | /* Stats */ | |
118 | u64 rx_bytes; | |
119 | u64 rx_pkts; | |
120 | u64 rx_ring_empty; | |
121 | u64 rx_err_no_buf; | |
122 | u64 rx_err_oflow; | |
123 | u64 rx_err_ver; | |
124 | u64 tx_bytes; | |
125 | u64 tx_pkts; | |
126 | u64 tx_ring_full; | |
127 | }; | |
128 | ||
129 | struct ntb_transport_mw { | |
130 | size_t size; | |
131 | void *virt_addr; | |
132 | dma_addr_t dma_addr; | |
133 | }; | |
134 | ||
135 | struct ntb_transport_client_dev { | |
136 | struct list_head entry; | |
137 | struct device dev; | |
138 | }; | |
139 | ||
140 | struct ntb_transport { | |
141 | struct list_head entry; | |
142 | struct list_head client_devs; | |
143 | ||
144 | struct ntb_device *ndev; | |
145 | struct ntb_transport_mw mw[NTB_NUM_MW]; | |
146 | struct ntb_transport_qp *qps; | |
147 | unsigned int max_qps; | |
148 | unsigned long qp_bitmap; | |
149 | bool transport_link; | |
150 | struct delayed_work link_work; | |
151 | struct dentry *debugfs_dir; | |
152 | }; | |
153 | ||
154 | enum { | |
155 | DESC_DONE_FLAG = 1 << 0, | |
156 | LINK_DOWN_FLAG = 1 << 1, | |
157 | }; | |
158 | ||
159 | struct ntb_payload_header { | |
160 | u64 ver; | |
161 | unsigned int len; | |
162 | unsigned int flags; | |
163 | }; | |
164 | ||
165 | enum { | |
166 | VERSION = 0, | |
167 | MW0_SZ, | |
168 | MW1_SZ, | |
169 | NUM_QPS, | |
170 | QP_LINKS, | |
171 | MAX_SPAD, | |
172 | }; | |
173 | ||
174 | #define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) | |
175 | #define NTB_QP_DEF_NUM_ENTRIES 100 | |
176 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
177 | ||
178 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
179 | { | |
180 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
181 | } | |
182 | ||
183 | static int ntb_client_probe(struct device *dev) | |
184 | { | |
185 | const struct ntb_client *drv = container_of(dev->driver, | |
186 | struct ntb_client, driver); | |
187 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
188 | int rc = -EINVAL; | |
189 | ||
190 | get_device(dev); | |
191 | if (drv && drv->probe) | |
192 | rc = drv->probe(pdev); | |
193 | if (rc) | |
194 | put_device(dev); | |
195 | ||
196 | return rc; | |
197 | } | |
198 | ||
199 | static int ntb_client_remove(struct device *dev) | |
200 | { | |
201 | const struct ntb_client *drv = container_of(dev->driver, | |
202 | struct ntb_client, driver); | |
203 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
204 | ||
205 | if (drv && drv->remove) | |
206 | drv->remove(pdev); | |
207 | ||
208 | put_device(dev); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | struct bus_type ntb_bus_type = { | |
214 | .name = "ntb_bus", | |
215 | .match = ntb_match_bus, | |
216 | .probe = ntb_client_probe, | |
217 | .remove = ntb_client_remove, | |
218 | }; | |
219 | ||
220 | static LIST_HEAD(ntb_transport_list); | |
221 | ||
78a61ab7 | 222 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
223 | { |
224 | if (list_empty(&ntb_transport_list)) { | |
225 | int rc = bus_register(&ntb_bus_type); | |
226 | if (rc) | |
227 | return rc; | |
228 | } | |
229 | ||
230 | list_add(&nt->entry, &ntb_transport_list); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
78a61ab7 | 235 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
236 | { |
237 | struct ntb_transport_client_dev *client_dev, *cd; | |
238 | ||
239 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
240 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
241 | dev_name(&client_dev->dev)); | |
242 | list_del(&client_dev->entry); | |
243 | device_unregister(&client_dev->dev); | |
244 | } | |
245 | ||
246 | list_del(&nt->entry); | |
247 | ||
248 | if (list_empty(&ntb_transport_list)) | |
249 | bus_unregister(&ntb_bus_type); | |
250 | } | |
251 | ||
252 | static void ntb_client_release(struct device *dev) | |
253 | { | |
254 | struct ntb_transport_client_dev *client_dev; | |
255 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
256 | ||
257 | kfree(client_dev); | |
258 | } | |
259 | ||
260 | /** | |
261 | * ntb_unregister_client_dev - Unregister NTB client device | |
262 | * @device_name: Name of NTB client device | |
263 | * | |
264 | * Unregister an NTB client device with the NTB transport layer | |
265 | */ | |
266 | void ntb_unregister_client_dev(char *device_name) | |
267 | { | |
268 | struct ntb_transport_client_dev *client, *cd; | |
269 | struct ntb_transport *nt; | |
270 | ||
271 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
272 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
273 | if (!strncmp(dev_name(&client->dev), device_name, | |
274 | strlen(device_name))) { | |
275 | list_del(&client->entry); | |
276 | device_unregister(&client->dev); | |
277 | } | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
280 | ||
281 | /** | |
282 | * ntb_register_client_dev - Register NTB client device | |
283 | * @device_name: Name of NTB client device | |
284 | * | |
285 | * Register an NTB client device with the NTB transport layer | |
286 | */ | |
287 | int ntb_register_client_dev(char *device_name) | |
288 | { | |
289 | struct ntb_transport_client_dev *client_dev; | |
290 | struct ntb_transport *nt; | |
291 | int rc; | |
292 | ||
8222b402 JM |
293 | if (list_empty(&ntb_transport_list)) |
294 | return -ENODEV; | |
295 | ||
fce8a7bb JM |
296 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
297 | struct device *dev; | |
298 | ||
299 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
300 | GFP_KERNEL); | |
301 | if (!client_dev) { | |
302 | rc = -ENOMEM; | |
303 | goto err; | |
304 | } | |
305 | ||
306 | dev = &client_dev->dev; | |
307 | ||
308 | /* setup and register client devices */ | |
309 | dev_set_name(dev, "%s", device_name); | |
310 | dev->bus = &ntb_bus_type; | |
311 | dev->release = ntb_client_release; | |
312 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
313 | ||
314 | rc = device_register(dev); | |
315 | if (rc) { | |
316 | kfree(client_dev); | |
317 | goto err; | |
318 | } | |
319 | ||
320 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
321 | } | |
322 | ||
323 | return 0; | |
324 | ||
325 | err: | |
326 | ntb_unregister_client_dev(device_name); | |
327 | ||
328 | return rc; | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
331 | ||
332 | /** | |
333 | * ntb_register_client - Register NTB client driver | |
334 | * @drv: NTB client driver to be registered | |
335 | * | |
336 | * Register an NTB client driver with the NTB transport layer | |
337 | * | |
338 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
339 | */ | |
340 | int ntb_register_client(struct ntb_client *drv) | |
341 | { | |
342 | drv->driver.bus = &ntb_bus_type; | |
343 | ||
8222b402 JM |
344 | if (list_empty(&ntb_transport_list)) |
345 | return -ENODEV; | |
346 | ||
fce8a7bb JM |
347 | return driver_register(&drv->driver); |
348 | } | |
349 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
350 | ||
351 | /** | |
352 | * ntb_unregister_client - Unregister NTB client driver | |
353 | * @drv: NTB client driver to be unregistered | |
354 | * | |
355 | * Unregister an NTB client driver with the NTB transport layer | |
356 | * | |
357 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
358 | */ | |
359 | void ntb_unregister_client(struct ntb_client *drv) | |
360 | { | |
361 | driver_unregister(&drv->driver); | |
362 | } | |
363 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
364 | ||
365 | static int debugfs_open(struct inode *inode, struct file *filp) | |
366 | { | |
367 | filp->private_data = inode->i_private; | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, | |
372 | loff_t *offp) | |
373 | { | |
374 | struct ntb_transport_qp *qp; | |
375 | char buf[1024]; | |
376 | ssize_t ret, out_offset, out_count; | |
377 | ||
378 | out_count = 1024; | |
379 | ||
380 | qp = filp->private_data; | |
381 | out_offset = 0; | |
382 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
383 | "NTB QP stats\n"); | |
384 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
385 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
386 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
387 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
388 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
389 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
390 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
391 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
392 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
393 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
394 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
395 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
396 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
397 | "rx_buff_begin - %p\n", qp->rx_buff_begin); | |
398 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
399 | "rx_offset - \t%p\n", qp->rx_offset); | |
400 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
401 | "rx_buff_end - \t%p\n", qp->rx_buff_end); | |
402 | ||
403 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
404 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
405 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
406 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
407 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
408 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
409 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
410 | "tx_mw_begin - \t%p\n", qp->tx_mw_begin); | |
411 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
412 | "tx_offset - \t%p\n", qp->tx_offset); | |
413 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
414 | "tx_mw_end - \t%p\n", qp->tx_mw_end); | |
415 | ||
416 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
417 | "QP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? | |
418 | "Up" : "Down"); | |
419 | ||
420 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
421 | return ret; | |
422 | } | |
423 | ||
424 | static const struct file_operations ntb_qp_debugfs_stats = { | |
425 | .owner = THIS_MODULE, | |
426 | .open = debugfs_open, | |
427 | .read = debugfs_read, | |
428 | }; | |
429 | ||
430 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
431 | struct list_head *list) | |
432 | { | |
433 | unsigned long flags; | |
434 | ||
435 | spin_lock_irqsave(lock, flags); | |
436 | list_add_tail(entry, list); | |
437 | spin_unlock_irqrestore(lock, flags); | |
438 | } | |
439 | ||
440 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
441 | struct list_head *list) | |
442 | { | |
443 | struct ntb_queue_entry *entry; | |
444 | unsigned long flags; | |
445 | ||
446 | spin_lock_irqsave(lock, flags); | |
447 | if (list_empty(list)) { | |
448 | entry = NULL; | |
449 | goto out; | |
450 | } | |
451 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
452 | list_del(&entry->entry); | |
453 | out: | |
454 | spin_unlock_irqrestore(lock, flags); | |
455 | ||
456 | return entry; | |
457 | } | |
458 | ||
459 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
460 | unsigned int qp_num) | |
461 | { | |
462 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 463 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 464 | u8 mw_num = QP_TO_MW(qp_num); |
ef114ed5 | 465 | void *offset; |
fce8a7bb JM |
466 | |
467 | WARN_ON(nt->mw[mw_num].virt_addr == 0); | |
468 | ||
ef114ed5 JM |
469 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
470 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
471 | else |
472 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
473 | ||
ef114ed5 | 474 | rx_size = nt->mw[mw_num].size / num_qps_mw; |
fce8a7bb | 475 | qp->rx_buff_begin = nt->mw[mw_num].virt_addr + |
ef114ed5 JM |
476 | (qp_num / NTB_NUM_MW * rx_size); |
477 | qp->rx_buff_end = qp->rx_buff_begin + rx_size; | |
fce8a7bb | 478 | qp->rx_offset = qp->rx_buff_begin; |
ef114ed5 | 479 | qp->rx_max_frame = min(transport_mtu, rx_size); |
fce8a7bb | 480 | |
ef114ed5 JM |
481 | /* setup the hdr offsets with 0's */ |
482 | for (offset = qp->rx_buff_begin + qp->rx_max_frame - | |
483 | sizeof(struct ntb_payload_header); | |
484 | offset < qp->rx_buff_end; offset += qp->rx_max_frame) | |
485 | memset(offset, 0, sizeof(struct ntb_payload_header)); | |
fce8a7bb JM |
486 | |
487 | qp->rx_pkts = 0; | |
488 | qp->tx_pkts = 0; | |
489 | } | |
490 | ||
491 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
492 | { | |
493 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
494 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb JM |
495 | |
496 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
497 | mw->size = ALIGN(size, 4096); | |
498 | ||
499 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
500 | GFP_KERNEL); | |
501 | if (!mw->virt_addr) { | |
502 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
503 | (int) mw->size); | |
504 | return -ENOMEM; | |
505 | } | |
506 | ||
fce8a7bb JM |
507 | /* Notify HW the memory location of the receive buffer */ |
508 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) | |
514 | { | |
515 | struct ntb_transport *nt = qp->transport; | |
516 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
517 | ||
518 | if (qp->qp_link == NTB_LINK_DOWN) { | |
519 | cancel_delayed_work_sync(&qp->link_work); | |
520 | return; | |
521 | } | |
522 | ||
523 | if (qp->event_handler) | |
524 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
525 | ||
526 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
527 | qp->qp_link = NTB_LINK_DOWN; | |
528 | ||
529 | if (nt->transport_link == NTB_LINK_UP) | |
530 | schedule_delayed_work(&qp->link_work, | |
531 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
532 | } | |
533 | ||
534 | static void ntb_transport_conn_down(struct ntb_transport *nt) | |
535 | { | |
536 | int i; | |
537 | ||
538 | if (nt->transport_link == NTB_LINK_DOWN) | |
539 | cancel_delayed_work_sync(&nt->link_work); | |
540 | else | |
541 | nt->transport_link = NTB_LINK_DOWN; | |
542 | ||
543 | /* Pass along the info to any clients */ | |
544 | for (i = 0; i < nt->max_qps; i++) | |
545 | if (!test_bit(i, &nt->qp_bitmap)) | |
546 | ntb_qp_link_down(&nt->qps[i]); | |
547 | ||
548 | /* The scratchpad registers keep the values if the remote side | |
549 | * goes down, blast them now to give them a sane value the next | |
550 | * time they are accessed | |
551 | */ | |
552 | for (i = 0; i < MAX_SPAD; i++) | |
553 | ntb_write_local_spad(nt->ndev, i, 0); | |
554 | } | |
555 | ||
556 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
557 | { | |
558 | struct ntb_transport *nt = data; | |
559 | ||
560 | switch (event) { | |
561 | case NTB_EVENT_HW_LINK_UP: | |
562 | schedule_delayed_work(&nt->link_work, 0); | |
563 | break; | |
564 | case NTB_EVENT_HW_LINK_DOWN: | |
565 | ntb_transport_conn_down(nt); | |
566 | break; | |
567 | default: | |
568 | BUG(); | |
569 | } | |
570 | } | |
571 | ||
572 | static void ntb_transport_link_work(struct work_struct *work) | |
573 | { | |
574 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
575 | link_work.work); | |
576 | struct ntb_device *ndev = nt->ndev; | |
577 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
578 | u32 val; | |
579 | int rc, i; | |
580 | ||
581 | /* send the local info */ | |
582 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); | |
583 | if (rc) { | |
584 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
585 | 0, VERSION); | |
586 | goto out; | |
587 | } | |
588 | ||
589 | rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0)); | |
590 | if (rc) { | |
591 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
592 | (u32) ntb_get_mw_size(ndev, 0), MW0_SZ); | |
593 | goto out; | |
594 | } | |
595 | ||
596 | rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1)); | |
597 | if (rc) { | |
598 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
599 | (u32) ntb_get_mw_size(ndev, 1), MW1_SZ); | |
600 | goto out; | |
601 | } | |
602 | ||
603 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
604 | if (rc) { | |
605 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
606 | nt->max_qps, NUM_QPS); | |
607 | goto out; | |
608 | } | |
609 | ||
610 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
611 | if (rc) { | |
612 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
613 | goto out; | |
614 | } | |
615 | ||
616 | rc = ntb_write_remote_spad(ndev, QP_LINKS, val); | |
617 | if (rc) { | |
618 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
619 | val, QP_LINKS); | |
620 | goto out; | |
621 | } | |
622 | ||
623 | /* Query the remote side for its info */ | |
624 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
625 | if (rc) { | |
626 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
627 | goto out; | |
628 | } | |
629 | ||
630 | if (val != NTB_TRANSPORT_VERSION) | |
631 | goto out; | |
632 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
633 | ||
634 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
635 | if (rc) { | |
636 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
637 | goto out; | |
638 | } | |
639 | ||
640 | if (val != nt->max_qps) | |
641 | goto out; | |
642 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
643 | ||
644 | rc = ntb_read_remote_spad(ndev, MW0_SZ, &val); | |
645 | if (rc) { | |
646 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ); | |
647 | goto out; | |
648 | } | |
649 | ||
650 | if (!val) | |
651 | goto out; | |
652 | dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val); | |
653 | ||
654 | rc = ntb_set_mw(nt, 0, val); | |
655 | if (rc) | |
656 | goto out; | |
657 | ||
658 | rc = ntb_read_remote_spad(ndev, MW1_SZ, &val); | |
659 | if (rc) { | |
660 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ); | |
661 | goto out; | |
662 | } | |
663 | ||
664 | if (!val) | |
665 | goto out; | |
666 | dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val); | |
667 | ||
668 | rc = ntb_set_mw(nt, 1, val); | |
669 | if (rc) | |
670 | goto out; | |
671 | ||
672 | nt->transport_link = NTB_LINK_UP; | |
673 | ||
674 | for (i = 0; i < nt->max_qps; i++) { | |
675 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
676 | ||
677 | ntb_transport_setup_qp_mw(nt, i); | |
678 | ||
679 | if (qp->client_ready == NTB_LINK_UP) | |
680 | schedule_delayed_work(&qp->link_work, 0); | |
681 | } | |
682 | ||
683 | return; | |
684 | ||
685 | out: | |
686 | if (ntb_hw_link_status(ndev)) | |
687 | schedule_delayed_work(&nt->link_work, | |
688 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
689 | } | |
690 | ||
691 | static void ntb_qp_link_work(struct work_struct *work) | |
692 | { | |
693 | struct ntb_transport_qp *qp = container_of(work, | |
694 | struct ntb_transport_qp, | |
695 | link_work.work); | |
696 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
697 | struct ntb_transport *nt = qp->transport; | |
698 | int rc, val; | |
699 | ||
700 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
701 | ||
702 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
703 | if (rc) { | |
704 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
705 | return; | |
706 | } | |
707 | ||
708 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
709 | if (rc) | |
710 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
711 | val | 1 << qp->qp_num, QP_LINKS); | |
712 | ||
713 | /* query remote spad for qp ready bits */ | |
714 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
715 | if (rc) | |
716 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
717 | ||
718 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
719 | ||
720 | /* See if the remote side is up */ | |
721 | if (1 << qp->qp_num & val) { | |
722 | qp->qp_link = NTB_LINK_UP; | |
723 | ||
724 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
725 | if (qp->event_handler) | |
726 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
727 | } else if (nt->transport_link == NTB_LINK_UP) | |
728 | schedule_delayed_work(&qp->link_work, | |
729 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
730 | } | |
731 | ||
732 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
733 | unsigned int qp_num) | |
734 | { | |
735 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
736 | unsigned int num_qps_mw, tx_size; |
737 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
738 | |
739 | qp = &nt->qps[qp_num]; | |
740 | qp->qp_num = qp_num; | |
741 | qp->transport = nt; | |
742 | qp->ndev = nt->ndev; | |
743 | qp->qp_link = NTB_LINK_DOWN; | |
744 | qp->client_ready = NTB_LINK_DOWN; | |
745 | qp->event_handler = NULL; | |
746 | ||
ef114ed5 JM |
747 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
748 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
749 | else | |
750 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
751 | ||
752 | tx_size = ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; | |
753 | qp->tx_mw_begin = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
754 | (qp_num / NTB_NUM_MW * tx_size); | |
755 | qp->tx_mw_end = qp->tx_mw_begin + tx_size; | |
756 | qp->tx_offset = qp->tx_mw_begin; | |
757 | qp->tx_max_frame = min(transport_mtu, tx_size); | |
758 | ||
fce8a7bb JM |
759 | if (nt->debugfs_dir) { |
760 | char debugfs_name[4]; | |
761 | ||
762 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
763 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
764 | nt->debugfs_dir); | |
765 | ||
766 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
767 | qp->debugfs_dir, qp, | |
768 | &ntb_qp_debugfs_stats); | |
769 | } | |
770 | ||
771 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
772 | ||
773 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
774 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
775 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
776 | ||
777 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
778 | INIT_LIST_HEAD(&qp->rx_free_q); | |
779 | INIT_LIST_HEAD(&qp->tx_free_q); | |
780 | } | |
781 | ||
782 | int ntb_transport_init(struct pci_dev *pdev) | |
783 | { | |
784 | struct ntb_transport *nt; | |
785 | int rc, i; | |
786 | ||
787 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
788 | if (!nt) | |
789 | return -ENOMEM; | |
790 | ||
791 | if (debugfs_initialized()) | |
792 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
793 | else | |
794 | nt->debugfs_dir = NULL; | |
795 | ||
796 | nt->ndev = ntb_register_transport(pdev, nt); | |
797 | if (!nt->ndev) { | |
798 | rc = -EIO; | |
799 | goto err; | |
800 | } | |
801 | ||
802 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
803 | ||
804 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
805 | GFP_KERNEL); | |
806 | if (!nt->qps) { | |
807 | rc = -ENOMEM; | |
808 | goto err1; | |
809 | } | |
810 | ||
811 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
812 | ||
813 | for (i = 0; i < nt->max_qps; i++) | |
814 | ntb_transport_init_queue(nt, i); | |
815 | ||
816 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
817 | ||
818 | rc = ntb_register_event_callback(nt->ndev, | |
819 | ntb_transport_event_callback); | |
820 | if (rc) | |
821 | goto err2; | |
822 | ||
823 | INIT_LIST_HEAD(&nt->client_devs); | |
824 | rc = ntb_bus_init(nt); | |
825 | if (rc) | |
826 | goto err3; | |
827 | ||
828 | if (ntb_hw_link_status(nt->ndev)) | |
829 | schedule_delayed_work(&nt->link_work, 0); | |
830 | ||
831 | return 0; | |
832 | ||
833 | err3: | |
834 | ntb_unregister_event_callback(nt->ndev); | |
835 | err2: | |
836 | kfree(nt->qps); | |
837 | err1: | |
838 | ntb_unregister_transport(nt->ndev); | |
839 | err: | |
840 | debugfs_remove_recursive(nt->debugfs_dir); | |
841 | kfree(nt); | |
842 | return rc; | |
843 | } | |
844 | ||
845 | void ntb_transport_free(void *transport) | |
846 | { | |
847 | struct ntb_transport *nt = transport; | |
848 | struct pci_dev *pdev; | |
849 | int i; | |
850 | ||
851 | nt->transport_link = NTB_LINK_DOWN; | |
852 | ||
853 | /* verify that all the qp's are freed */ | |
854 | for (i = 0; i < nt->max_qps; i++) | |
855 | if (!test_bit(i, &nt->qp_bitmap)) | |
856 | ntb_transport_free_queue(&nt->qps[i]); | |
857 | ||
858 | ntb_bus_remove(nt); | |
859 | ||
860 | cancel_delayed_work_sync(&nt->link_work); | |
861 | ||
862 | debugfs_remove_recursive(nt->debugfs_dir); | |
863 | ||
864 | ntb_unregister_event_callback(nt->ndev); | |
865 | ||
866 | pdev = ntb_query_pdev(nt->ndev); | |
867 | ||
868 | for (i = 0; i < NTB_NUM_MW; i++) | |
869 | if (nt->mw[i].virt_addr) | |
870 | dma_free_coherent(&pdev->dev, nt->mw[i].size, | |
871 | nt->mw[i].virt_addr, | |
872 | nt->mw[i].dma_addr); | |
873 | ||
874 | kfree(nt->qps); | |
875 | ntb_unregister_transport(nt->ndev); | |
876 | kfree(nt); | |
877 | } | |
878 | ||
879 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
880 | struct ntb_queue_entry *entry, void *offset) | |
881 | { | |
882 | ||
883 | struct ntb_payload_header *hdr; | |
884 | ||
885 | BUG_ON(offset < qp->rx_buff_begin || | |
ef114ed5 | 886 | offset + qp->rx_max_frame >= qp->rx_buff_end); |
fce8a7bb | 887 | |
ef114ed5 | 888 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
889 | entry->len = hdr->len; |
890 | ||
891 | memcpy(entry->buf, offset, entry->len); | |
892 | ||
893 | /* Ensure that the data is fully copied out before clearing the flag */ | |
894 | wmb(); | |
895 | hdr->flags = 0; | |
896 | ||
897 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
898 | qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len); | |
899 | ||
900 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
901 | } | |
902 | ||
903 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
904 | { | |
905 | struct ntb_payload_header *hdr; | |
906 | struct ntb_queue_entry *entry; | |
907 | void *offset; | |
908 | ||
909 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
910 | if (!entry) { | |
ef114ed5 | 911 | hdr = offset + qp->rx_max_frame - |
fce8a7bb JM |
912 | sizeof(struct ntb_payload_header); |
913 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
914 | "no buffer - HDR ver %llu, len %d, flags %x\n", | |
915 | hdr->ver, hdr->len, hdr->flags); | |
916 | qp->rx_err_no_buf++; | |
917 | return -ENOMEM; | |
918 | } | |
919 | ||
920 | offset = qp->rx_offset; | |
ef114ed5 | 921 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
922 | |
923 | if (!(hdr->flags & DESC_DONE_FLAG)) { | |
924 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
925 | &qp->rx_pend_q); | |
926 | qp->rx_ring_empty++; | |
927 | return -EAGAIN; | |
928 | } | |
929 | ||
930 | if (hdr->ver != qp->rx_pkts) { | |
931 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
932 | "qp %d: version mismatch, expected %llu - got %llu\n", | |
933 | qp->qp_num, qp->rx_pkts, hdr->ver); | |
934 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
935 | &qp->rx_pend_q); | |
936 | qp->rx_err_ver++; | |
937 | return -EIO; | |
938 | } | |
939 | ||
940 | if (hdr->flags & LINK_DOWN_FLAG) { | |
941 | ntb_qp_link_down(qp); | |
942 | ||
943 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
944 | &qp->rx_pend_q); | |
945 | ||
946 | /* Ensure that the data is fully copied out before clearing the | |
947 | * done flag | |
948 | */ | |
949 | wmb(); | |
950 | hdr->flags = 0; | |
951 | goto out; | |
952 | } | |
953 | ||
954 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
955 | "rx offset %p, ver %llu - %d payload received, buf size %d\n", | |
956 | qp->rx_offset, hdr->ver, hdr->len, entry->len); | |
957 | ||
958 | if (hdr->len <= entry->len) | |
959 | ntb_rx_copy_task(qp, entry, offset); | |
960 | else { | |
961 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
962 | &qp->rx_pend_q); | |
963 | ||
964 | /* Ensure that the data is fully copied out before clearing the | |
965 | * done flag | |
966 | */ | |
967 | wmb(); | |
968 | hdr->flags = 0; | |
969 | qp->rx_err_oflow++; | |
970 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
971 | "RX overflow! Wanted %d got %d\n", | |
972 | hdr->len, entry->len); | |
973 | } | |
974 | ||
975 | qp->rx_bytes += hdr->len; | |
976 | qp->rx_pkts++; | |
977 | ||
978 | out: | |
ef114ed5 JM |
979 | qp->rx_offset += qp->rx_max_frame; |
980 | if (qp->rx_offset + qp->rx_max_frame >= qp->rx_buff_end) | |
fce8a7bb JM |
981 | qp->rx_offset = qp->rx_buff_begin; |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | static void ntb_transport_rx(unsigned long data) | |
987 | { | |
988 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
989 | int rc; | |
990 | ||
991 | do { | |
992 | rc = ntb_process_rxc(qp); | |
993 | } while (!rc); | |
994 | } | |
995 | ||
996 | static void ntb_transport_rxc_db(void *data, int db_num) | |
997 | { | |
998 | struct ntb_transport_qp *qp = data; | |
999 | ||
1000 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1001 | __func__, db_num); | |
1002 | ||
1003 | tasklet_schedule(&qp->rx_work); | |
1004 | } | |
1005 | ||
1006 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1007 | struct ntb_queue_entry *entry, | |
1008 | void *offset) | |
1009 | { | |
1010 | struct ntb_payload_header *hdr; | |
1011 | ||
1012 | BUG_ON(offset < qp->tx_mw_begin || | |
ef114ed5 | 1013 | offset + qp->tx_max_frame >= qp->tx_mw_end); |
fce8a7bb JM |
1014 | |
1015 | memcpy_toio(offset, entry->buf, entry->len); | |
1016 | ||
ef114ed5 | 1017 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1018 | hdr->len = entry->len; |
1019 | hdr->ver = qp->tx_pkts; | |
1020 | ||
1021 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1022 | wmb(); |
fce8a7bb JM |
1023 | hdr->flags = entry->flags | DESC_DONE_FLAG; |
1024 | ||
1025 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1026 | ||
1027 | /* The entry length can only be zero if the packet is intended to be a | |
1028 | * "link down" or similar. Since no payload is being sent in these | |
1029 | * cases, there is nothing to add to the completion queue. | |
1030 | */ | |
1031 | if (entry->len > 0) { | |
1032 | qp->tx_bytes += entry->len; | |
1033 | ||
1034 | if (qp->tx_handler) | |
1035 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1036 | entry->len); | |
1037 | } | |
1038 | ||
1039 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1040 | } | |
1041 | ||
1042 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1043 | struct ntb_queue_entry *entry) | |
1044 | { | |
1045 | struct ntb_payload_header *hdr; | |
1046 | void *offset; | |
1047 | ||
1048 | offset = qp->tx_offset; | |
ef114ed5 | 1049 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1050 | |
1051 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %p, entry len %d flags %x buff %p\n", | |
1052 | qp->tx_pkts, offset, qp->tx_offset, entry->len, entry->flags, | |
1053 | entry->buf); | |
1054 | if (hdr->flags) { | |
1055 | qp->tx_ring_full++; | |
1056 | return -EAGAIN; | |
1057 | } | |
1058 | ||
ef114ed5 | 1059 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1060 | if (qp->tx_handler) |
1061 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1062 | ||
1063 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1064 | &qp->tx_free_q); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | ntb_tx_copy_task(qp, entry, offset); | |
1069 | ||
ef114ed5 JM |
1070 | qp->tx_offset += qp->tx_max_frame; |
1071 | if (qp->tx_offset + qp->tx_max_frame >= qp->tx_mw_end) | |
fce8a7bb JM |
1072 | qp->tx_offset = qp->tx_mw_begin; |
1073 | ||
1074 | qp->tx_pkts++; | |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1080 | { | |
1081 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1082 | struct ntb_queue_entry *entry; | |
1083 | int i, rc; | |
1084 | ||
1085 | if (qp->qp_link == NTB_LINK_DOWN) | |
1086 | return; | |
1087 | ||
1088 | qp->qp_link = NTB_LINK_DOWN; | |
1089 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1090 | ||
1091 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
1092 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, | |
1093 | &qp->tx_free_q); | |
1094 | if (entry) | |
1095 | break; | |
1096 | msleep(100); | |
1097 | } | |
1098 | ||
1099 | if (!entry) | |
1100 | return; | |
1101 | ||
1102 | entry->cb_data = NULL; | |
1103 | entry->buf = NULL; | |
1104 | entry->len = 0; | |
1105 | entry->flags = LINK_DOWN_FLAG; | |
1106 | ||
1107 | rc = ntb_process_tx(qp, entry); | |
1108 | if (rc) | |
1109 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1110 | qp->qp_num); | |
1111 | } | |
1112 | ||
1113 | /** | |
1114 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1115 | * @rx_handler: receive callback function | |
1116 | * @tx_handler: transmit callback function | |
1117 | * @event_handler: event callback function | |
1118 | * | |
1119 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1120 | * routine for both transmit and receive. The receive callback routine will be | |
1121 | * used to pass up data when the transport has received it on the queue. The | |
1122 | * transmit callback routine will be called when the transport has completed the | |
1123 | * transmission of the data on the queue and the data is ready to be freed. | |
1124 | * | |
1125 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1126 | */ | |
1127 | struct ntb_transport_qp * | |
1128 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1129 | const struct ntb_queue_handlers *handlers) | |
1130 | { | |
1131 | struct ntb_queue_entry *entry; | |
1132 | struct ntb_transport_qp *qp; | |
1133 | struct ntb_transport *nt; | |
1134 | unsigned int free_queue; | |
1135 | int rc, i; | |
1136 | ||
1137 | nt = ntb_find_transport(pdev); | |
1138 | if (!nt) | |
1139 | goto err; | |
1140 | ||
1141 | free_queue = ffs(nt->qp_bitmap); | |
1142 | if (!free_queue) | |
1143 | goto err; | |
1144 | ||
1145 | /* decrement free_queue to make it zero based */ | |
1146 | free_queue--; | |
1147 | ||
1148 | clear_bit(free_queue, &nt->qp_bitmap); | |
1149 | ||
1150 | qp = &nt->qps[free_queue]; | |
1151 | qp->cb_data = data; | |
1152 | qp->rx_handler = handlers->rx_handler; | |
1153 | qp->tx_handler = handlers->tx_handler; | |
1154 | qp->event_handler = handlers->event_handler; | |
1155 | ||
1156 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1157 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1158 | if (!entry) | |
1159 | goto err1; | |
1160 | ||
1161 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
1162 | &qp->rx_free_q); | |
1163 | } | |
1164 | ||
1165 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1166 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1167 | if (!entry) | |
1168 | goto err2; | |
1169 | ||
1170 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1171 | &qp->tx_free_q); | |
1172 | } | |
1173 | ||
1174 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1175 | ||
1176 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1177 | ntb_transport_rxc_db); | |
1178 | if (rc) | |
1179 | goto err3; | |
1180 | ||
1181 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1182 | ||
1183 | return qp; | |
1184 | ||
1185 | err3: | |
1186 | tasklet_disable(&qp->rx_work); | |
1187 | err2: | |
1188 | while ((entry = | |
1189 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1190 | kfree(entry); | |
1191 | err1: | |
1192 | while ((entry = | |
1193 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1194 | kfree(entry); | |
1195 | set_bit(free_queue, &nt->qp_bitmap); | |
1196 | err: | |
1197 | return NULL; | |
1198 | } | |
1199 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1200 | ||
1201 | /** | |
1202 | * ntb_transport_free_queue - Frees NTB transport queue | |
1203 | * @qp: NTB queue to be freed | |
1204 | * | |
1205 | * Frees NTB transport queue | |
1206 | */ | |
1207 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1208 | { | |
1209 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1210 | struct ntb_queue_entry *entry; | |
1211 | ||
1212 | if (!qp) | |
1213 | return; | |
1214 | ||
1215 | cancel_delayed_work_sync(&qp->link_work); | |
1216 | ||
1217 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1218 | tasklet_disable(&qp->rx_work); | |
1219 | ||
1220 | while ((entry = | |
1221 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1222 | kfree(entry); | |
1223 | ||
1224 | while ((entry = | |
1225 | ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { | |
1226 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); | |
1227 | kfree(entry); | |
1228 | } | |
1229 | ||
1230 | while ((entry = | |
1231 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1232 | kfree(entry); | |
1233 | ||
1234 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1235 | ||
1236 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1239 | ||
1240 | /** | |
1241 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1242 | * @qp: NTB queue to be freed | |
1243 | * @len: pointer to variable to write enqueued buffers length | |
1244 | * | |
1245 | * Dequeues unused buffers from receive queue. Should only be used during | |
1246 | * shutdown of qp. | |
1247 | * | |
1248 | * RETURNS: NULL error value on error, or void* for success. | |
1249 | */ | |
1250 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1251 | { | |
1252 | struct ntb_queue_entry *entry; | |
1253 | void *buf; | |
1254 | ||
1255 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1256 | return NULL; | |
1257 | ||
1258 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1259 | if (!entry) | |
1260 | return NULL; | |
1261 | ||
1262 | buf = entry->cb_data; | |
1263 | *len = entry->len; | |
1264 | ||
1265 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
1266 | &qp->rx_free_q); | |
1267 | ||
1268 | return buf; | |
1269 | } | |
1270 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1271 | ||
1272 | /** | |
1273 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1274 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1275 | * @cb: per buffer pointer for callback function to use | |
1276 | * @data: pointer to data buffer that incoming packets will be copied into | |
1277 | * @len: length of the data buffer | |
1278 | * | |
1279 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1280 | * payload can be received into. | |
1281 | * | |
1282 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1283 | */ | |
1284 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1285 | unsigned int len) | |
1286 | { | |
1287 | struct ntb_queue_entry *entry; | |
1288 | ||
1289 | if (!qp) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1293 | if (!entry) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | entry->cb_data = cb; | |
1297 | entry->buf = data; | |
1298 | entry->len = len; | |
1299 | ||
1300 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
1301 | &qp->rx_pend_q); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1306 | ||
1307 | /** | |
1308 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1309 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1310 | * @cb: per buffer pointer for callback function to use | |
1311 | * @data: pointer to data buffer that will be sent | |
1312 | * @len: length of the data buffer | |
1313 | * | |
1314 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1315 | * payload will be transmitted. This assumes that a lock is behing held to | |
1316 | * serialize access to the qp. | |
1317 | * | |
1318 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1319 | */ | |
1320 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1321 | unsigned int len) | |
1322 | { | |
1323 | struct ntb_queue_entry *entry; | |
1324 | int rc; | |
1325 | ||
1326 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1327 | return -EINVAL; | |
1328 | ||
1329 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1330 | if (!entry) | |
1331 | return -ENOMEM; | |
1332 | ||
1333 | entry->cb_data = cb; | |
1334 | entry->buf = data; | |
1335 | entry->len = len; | |
1336 | entry->flags = 0; | |
1337 | ||
1338 | rc = ntb_process_tx(qp, entry); | |
1339 | if (rc) | |
1340 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1341 | &qp->tx_free_q); | |
1342 | ||
1343 | return rc; | |
1344 | } | |
1345 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1346 | ||
1347 | /** | |
1348 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1349 | * @qp: NTB transport layer queue to be enabled | |
1350 | * | |
1351 | * Notify NTB transport layer of client readiness to use queue | |
1352 | */ | |
1353 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1354 | { | |
1355 | if (!qp) | |
1356 | return; | |
1357 | ||
1358 | qp->client_ready = NTB_LINK_UP; | |
1359 | ||
1360 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1361 | schedule_delayed_work(&qp->link_work, 0); | |
1362 | } | |
1363 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1364 | ||
1365 | /** | |
1366 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1367 | * @qp: NTB transport layer queue to be disabled | |
1368 | * | |
1369 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1370 | * transport queue specified. It is the client's responsibility to ensure all | |
1371 | * entries on queue are purged or otherwise handled appropraitely. | |
1372 | */ | |
1373 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1374 | { | |
1375 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1376 | int rc, val; | |
1377 | ||
1378 | if (!qp) | |
1379 | return; | |
1380 | ||
1381 | qp->client_ready = NTB_LINK_DOWN; | |
1382 | ||
1383 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1384 | if (rc) { | |
1385 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1386 | return; | |
1387 | } | |
1388 | ||
1389 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1390 | val & ~(1 << qp->qp_num)); | |
1391 | if (rc) | |
1392 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1393 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1394 | ||
1395 | if (qp->qp_link == NTB_LINK_UP) | |
1396 | ntb_send_link_down(qp); | |
1397 | else | |
1398 | cancel_delayed_work_sync(&qp->link_work); | |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1401 | ||
1402 | /** | |
1403 | * ntb_transport_link_query - Query transport link state | |
1404 | * @qp: NTB transport layer queue to be queried | |
1405 | * | |
1406 | * Query connectivity to the remote system of the NTB transport queue | |
1407 | * | |
1408 | * RETURNS: true for link up or false for link down | |
1409 | */ | |
1410 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1411 | { | |
1412 | return qp->qp_link == NTB_LINK_UP; | |
1413 | } | |
1414 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1415 | ||
1416 | /** | |
1417 | * ntb_transport_qp_num - Query the qp number | |
1418 | * @qp: NTB transport layer queue to be queried | |
1419 | * | |
1420 | * Query qp number of the NTB transport queue | |
1421 | * | |
1422 | * RETURNS: a zero based number specifying the qp number | |
1423 | */ | |
1424 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1425 | { | |
1426 | return qp->qp_num; | |
1427 | } | |
1428 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1429 | ||
1430 | /** | |
1431 | * ntb_transport_max_size - Query the max payload size of a qp | |
1432 | * @qp: NTB transport layer queue to be queried | |
1433 | * | |
1434 | * Query the maximum payload size permissible on the given qp | |
1435 | * | |
1436 | * RETURNS: the max payload size of a qp | |
1437 | */ | |
ef114ed5 | 1438 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1439 | { |
ef114ed5 | 1440 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1441 | } |
1442 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |