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Commit | Line | Data |
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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 | ||
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; | |
7b4f2d3c | 113 | struct work_struct link_cleanup; |
fce8a7bb JM |
114 | |
115 | struct dentry *debugfs_dir; | |
116 | struct dentry *debugfs_stats; | |
117 | ||
118 | /* Stats */ | |
119 | u64 rx_bytes; | |
120 | u64 rx_pkts; | |
121 | u64 rx_ring_empty; | |
122 | u64 rx_err_no_buf; | |
123 | u64 rx_err_oflow; | |
124 | u64 rx_err_ver; | |
125 | u64 tx_bytes; | |
126 | u64 tx_pkts; | |
127 | u64 tx_ring_full; | |
128 | }; | |
129 | ||
130 | struct ntb_transport_mw { | |
131 | size_t size; | |
132 | void *virt_addr; | |
133 | dma_addr_t dma_addr; | |
134 | }; | |
135 | ||
136 | struct ntb_transport_client_dev { | |
137 | struct list_head entry; | |
138 | struct device dev; | |
139 | }; | |
140 | ||
141 | struct ntb_transport { | |
142 | struct list_head entry; | |
143 | struct list_head client_devs; | |
144 | ||
145 | struct ntb_device *ndev; | |
146 | struct ntb_transport_mw mw[NTB_NUM_MW]; | |
147 | struct ntb_transport_qp *qps; | |
148 | unsigned int max_qps; | |
149 | unsigned long qp_bitmap; | |
150 | bool transport_link; | |
151 | struct delayed_work link_work; | |
7b4f2d3c | 152 | struct work_struct link_cleanup; |
fce8a7bb JM |
153 | struct dentry *debugfs_dir; |
154 | }; | |
155 | ||
156 | enum { | |
157 | DESC_DONE_FLAG = 1 << 0, | |
158 | LINK_DOWN_FLAG = 1 << 1, | |
159 | }; | |
160 | ||
161 | struct ntb_payload_header { | |
162 | u64 ver; | |
163 | unsigned int len; | |
164 | unsigned int flags; | |
165 | }; | |
166 | ||
167 | enum { | |
168 | VERSION = 0, | |
169 | MW0_SZ, | |
170 | MW1_SZ, | |
171 | NUM_QPS, | |
172 | QP_LINKS, | |
173 | MAX_SPAD, | |
174 | }; | |
175 | ||
176 | #define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) | |
177 | #define NTB_QP_DEF_NUM_ENTRIES 100 | |
178 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
179 | ||
180 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
181 | { | |
182 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
183 | } | |
184 | ||
185 | static int ntb_client_probe(struct device *dev) | |
186 | { | |
187 | const struct ntb_client *drv = container_of(dev->driver, | |
188 | struct ntb_client, driver); | |
189 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
190 | int rc = -EINVAL; | |
191 | ||
192 | get_device(dev); | |
193 | if (drv && drv->probe) | |
194 | rc = drv->probe(pdev); | |
195 | if (rc) | |
196 | put_device(dev); | |
197 | ||
198 | return rc; | |
199 | } | |
200 | ||
201 | static int ntb_client_remove(struct device *dev) | |
202 | { | |
203 | const struct ntb_client *drv = container_of(dev->driver, | |
204 | struct ntb_client, driver); | |
205 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
206 | ||
207 | if (drv && drv->remove) | |
208 | drv->remove(pdev); | |
209 | ||
210 | put_device(dev); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
170d35a5 | 215 | static struct bus_type ntb_bus_type = { |
fce8a7bb JM |
216 | .name = "ntb_bus", |
217 | .match = ntb_match_bus, | |
218 | .probe = ntb_client_probe, | |
219 | .remove = ntb_client_remove, | |
220 | }; | |
221 | ||
222 | static LIST_HEAD(ntb_transport_list); | |
223 | ||
78a61ab7 | 224 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
225 | { |
226 | if (list_empty(&ntb_transport_list)) { | |
227 | int rc = bus_register(&ntb_bus_type); | |
228 | if (rc) | |
229 | return rc; | |
230 | } | |
231 | ||
232 | list_add(&nt->entry, &ntb_transport_list); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
78a61ab7 | 237 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
238 | { |
239 | struct ntb_transport_client_dev *client_dev, *cd; | |
240 | ||
241 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
242 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
243 | dev_name(&client_dev->dev)); | |
244 | list_del(&client_dev->entry); | |
245 | device_unregister(&client_dev->dev); | |
246 | } | |
247 | ||
248 | list_del(&nt->entry); | |
249 | ||
250 | if (list_empty(&ntb_transport_list)) | |
251 | bus_unregister(&ntb_bus_type); | |
252 | } | |
253 | ||
254 | static void ntb_client_release(struct device *dev) | |
255 | { | |
256 | struct ntb_transport_client_dev *client_dev; | |
257 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
258 | ||
259 | kfree(client_dev); | |
260 | } | |
261 | ||
262 | /** | |
263 | * ntb_unregister_client_dev - Unregister NTB client device | |
264 | * @device_name: Name of NTB client device | |
265 | * | |
266 | * Unregister an NTB client device with the NTB transport layer | |
267 | */ | |
268 | void ntb_unregister_client_dev(char *device_name) | |
269 | { | |
270 | struct ntb_transport_client_dev *client, *cd; | |
271 | struct ntb_transport *nt; | |
272 | ||
273 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
274 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
275 | if (!strncmp(dev_name(&client->dev), device_name, | |
276 | strlen(device_name))) { | |
277 | list_del(&client->entry); | |
278 | device_unregister(&client->dev); | |
279 | } | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
282 | ||
283 | /** | |
284 | * ntb_register_client_dev - Register NTB client device | |
285 | * @device_name: Name of NTB client device | |
286 | * | |
287 | * Register an NTB client device with the NTB transport layer | |
288 | */ | |
289 | int ntb_register_client_dev(char *device_name) | |
290 | { | |
291 | struct ntb_transport_client_dev *client_dev; | |
292 | struct ntb_transport *nt; | |
293 | int rc; | |
294 | ||
8222b402 JM |
295 | if (list_empty(&ntb_transport_list)) |
296 | return -ENODEV; | |
297 | ||
fce8a7bb JM |
298 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
299 | struct device *dev; | |
300 | ||
301 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
302 | GFP_KERNEL); | |
303 | if (!client_dev) { | |
304 | rc = -ENOMEM; | |
305 | goto err; | |
306 | } | |
307 | ||
308 | dev = &client_dev->dev; | |
309 | ||
310 | /* setup and register client devices */ | |
311 | dev_set_name(dev, "%s", device_name); | |
312 | dev->bus = &ntb_bus_type; | |
313 | dev->release = ntb_client_release; | |
314 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
315 | ||
316 | rc = device_register(dev); | |
317 | if (rc) { | |
318 | kfree(client_dev); | |
319 | goto err; | |
320 | } | |
321 | ||
322 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
323 | } | |
324 | ||
325 | return 0; | |
326 | ||
327 | err: | |
328 | ntb_unregister_client_dev(device_name); | |
329 | ||
330 | return rc; | |
331 | } | |
332 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
333 | ||
334 | /** | |
335 | * ntb_register_client - Register NTB client driver | |
336 | * @drv: NTB client driver to be registered | |
337 | * | |
338 | * Register an NTB client driver with the NTB transport layer | |
339 | * | |
340 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
341 | */ | |
342 | int ntb_register_client(struct ntb_client *drv) | |
343 | { | |
344 | drv->driver.bus = &ntb_bus_type; | |
345 | ||
8222b402 JM |
346 | if (list_empty(&ntb_transport_list)) |
347 | return -ENODEV; | |
348 | ||
fce8a7bb JM |
349 | return driver_register(&drv->driver); |
350 | } | |
351 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
352 | ||
353 | /** | |
354 | * ntb_unregister_client - Unregister NTB client driver | |
355 | * @drv: NTB client driver to be unregistered | |
356 | * | |
357 | * Unregister an NTB client driver with the NTB transport layer | |
358 | * | |
359 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
360 | */ | |
361 | void ntb_unregister_client(struct ntb_client *drv) | |
362 | { | |
363 | driver_unregister(&drv->driver); | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
366 | ||
fce8a7bb JM |
367 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
368 | loff_t *offp) | |
369 | { | |
370 | struct ntb_transport_qp *qp; | |
d7237e22 | 371 | char *buf; |
fce8a7bb JM |
372 | ssize_t ret, out_offset, out_count; |
373 | ||
d7237e22 JM |
374 | out_count = 600; |
375 | ||
376 | buf = kmalloc(out_count, GFP_KERNEL); | |
377 | if (!buf) | |
378 | return -ENOMEM; | |
fce8a7bb JM |
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, | |
d7237e22 | 417 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 418 | "Up" : "Down"); |
d7237e22 JM |
419 | if (out_offset > out_count) |
420 | out_offset = out_count; | |
fce8a7bb JM |
421 | |
422 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 423 | kfree(buf); |
fce8a7bb JM |
424 | return ret; |
425 | } | |
426 | ||
427 | static const struct file_operations ntb_qp_debugfs_stats = { | |
428 | .owner = THIS_MODULE, | |
d66d7ac2 | 429 | .open = simple_open, |
fce8a7bb JM |
430 | .read = debugfs_read, |
431 | }; | |
432 | ||
433 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
434 | struct list_head *list) | |
435 | { | |
436 | unsigned long flags; | |
437 | ||
438 | spin_lock_irqsave(lock, flags); | |
439 | list_add_tail(entry, list); | |
440 | spin_unlock_irqrestore(lock, flags); | |
441 | } | |
442 | ||
443 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
444 | struct list_head *list) | |
445 | { | |
446 | struct ntb_queue_entry *entry; | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(lock, flags); | |
450 | if (list_empty(list)) { | |
451 | entry = NULL; | |
452 | goto out; | |
453 | } | |
454 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
455 | list_del(&entry->entry); | |
456 | out: | |
457 | spin_unlock_irqrestore(lock, flags); | |
458 | ||
459 | return entry; | |
460 | } | |
461 | ||
462 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
463 | unsigned int qp_num) | |
464 | { | |
465 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 466 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 467 | u8 mw_num = QP_TO_MW(qp_num); |
ef114ed5 | 468 | void *offset; |
fce8a7bb JM |
469 | |
470 | WARN_ON(nt->mw[mw_num].virt_addr == 0); | |
471 | ||
ef114ed5 JM |
472 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
473 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
474 | else |
475 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
476 | ||
ef114ed5 | 477 | rx_size = nt->mw[mw_num].size / num_qps_mw; |
fce8a7bb | 478 | qp->rx_buff_begin = nt->mw[mw_num].virt_addr + |
ef114ed5 JM |
479 | (qp_num / NTB_NUM_MW * rx_size); |
480 | qp->rx_buff_end = qp->rx_buff_begin + rx_size; | |
fce8a7bb | 481 | qp->rx_offset = qp->rx_buff_begin; |
ef114ed5 | 482 | qp->rx_max_frame = min(transport_mtu, rx_size); |
fce8a7bb | 483 | |
ef114ed5 JM |
484 | /* setup the hdr offsets with 0's */ |
485 | for (offset = qp->rx_buff_begin + qp->rx_max_frame - | |
486 | sizeof(struct ntb_payload_header); | |
487 | offset < qp->rx_buff_end; offset += qp->rx_max_frame) | |
488 | memset(offset, 0, sizeof(struct ntb_payload_header)); | |
fce8a7bb JM |
489 | |
490 | qp->rx_pkts = 0; | |
491 | qp->tx_pkts = 0; | |
492 | } | |
493 | ||
494 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
495 | { | |
496 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
497 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb JM |
498 | |
499 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
500 | mw->size = ALIGN(size, 4096); | |
501 | ||
502 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
503 | GFP_KERNEL); | |
504 | if (!mw->virt_addr) { | |
505 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
506 | (int) mw->size); | |
507 | return -ENOMEM; | |
508 | } | |
509 | ||
fce8a7bb JM |
510 | /* Notify HW the memory location of the receive buffer */ |
511 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
7b4f2d3c | 516 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 517 | { |
7b4f2d3c JM |
518 | struct ntb_transport_qp *qp = container_of(work, |
519 | struct ntb_transport_qp, | |
520 | link_cleanup); | |
fce8a7bb JM |
521 | struct ntb_transport *nt = qp->transport; |
522 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
523 | ||
524 | if (qp->qp_link == NTB_LINK_DOWN) { | |
525 | cancel_delayed_work_sync(&qp->link_work); | |
526 | return; | |
527 | } | |
528 | ||
529 | if (qp->event_handler) | |
530 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
531 | ||
532 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
533 | qp->qp_link = NTB_LINK_DOWN; | |
534 | ||
535 | if (nt->transport_link == NTB_LINK_UP) | |
536 | schedule_delayed_work(&qp->link_work, | |
537 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
538 | } | |
539 | ||
7b4f2d3c JM |
540 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
541 | { | |
542 | schedule_work(&qp->link_cleanup); | |
543 | } | |
544 | ||
545 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 546 | { |
7b4f2d3c JM |
547 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
548 | link_cleanup); | |
fce8a7bb JM |
549 | int i; |
550 | ||
551 | if (nt->transport_link == NTB_LINK_DOWN) | |
552 | cancel_delayed_work_sync(&nt->link_work); | |
553 | else | |
554 | nt->transport_link = NTB_LINK_DOWN; | |
555 | ||
556 | /* Pass along the info to any clients */ | |
557 | for (i = 0; i < nt->max_qps; i++) | |
558 | if (!test_bit(i, &nt->qp_bitmap)) | |
559 | ntb_qp_link_down(&nt->qps[i]); | |
560 | ||
561 | /* The scratchpad registers keep the values if the remote side | |
562 | * goes down, blast them now to give them a sane value the next | |
563 | * time they are accessed | |
564 | */ | |
565 | for (i = 0; i < MAX_SPAD; i++) | |
566 | ntb_write_local_spad(nt->ndev, i, 0); | |
567 | } | |
568 | ||
569 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
570 | { | |
571 | struct ntb_transport *nt = data; | |
572 | ||
573 | switch (event) { | |
574 | case NTB_EVENT_HW_LINK_UP: | |
575 | schedule_delayed_work(&nt->link_work, 0); | |
576 | break; | |
577 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 578 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
579 | break; |
580 | default: | |
581 | BUG(); | |
582 | } | |
583 | } | |
584 | ||
585 | static void ntb_transport_link_work(struct work_struct *work) | |
586 | { | |
587 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
588 | link_work.work); | |
589 | struct ntb_device *ndev = nt->ndev; | |
590 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
591 | u32 val; | |
592 | int rc, i; | |
593 | ||
594 | /* send the local info */ | |
595 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); | |
596 | if (rc) { | |
597 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
598 | 0, VERSION); | |
599 | goto out; | |
600 | } | |
601 | ||
602 | rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0)); | |
603 | if (rc) { | |
604 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
605 | (u32) ntb_get_mw_size(ndev, 0), MW0_SZ); | |
606 | goto out; | |
607 | } | |
608 | ||
609 | rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1)); | |
610 | if (rc) { | |
611 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
612 | (u32) ntb_get_mw_size(ndev, 1), MW1_SZ); | |
613 | goto out; | |
614 | } | |
615 | ||
616 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
617 | if (rc) { | |
618 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
619 | nt->max_qps, NUM_QPS); | |
620 | goto out; | |
621 | } | |
622 | ||
623 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
624 | if (rc) { | |
625 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
626 | goto out; | |
627 | } | |
628 | ||
629 | rc = ntb_write_remote_spad(ndev, QP_LINKS, val); | |
630 | if (rc) { | |
631 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
632 | val, QP_LINKS); | |
633 | goto out; | |
634 | } | |
635 | ||
636 | /* Query the remote side for its info */ | |
637 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
638 | if (rc) { | |
639 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
640 | goto out; | |
641 | } | |
642 | ||
643 | if (val != NTB_TRANSPORT_VERSION) | |
644 | goto out; | |
645 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
646 | ||
647 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
648 | if (rc) { | |
649 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
650 | goto out; | |
651 | } | |
652 | ||
653 | if (val != nt->max_qps) | |
654 | goto out; | |
655 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
656 | ||
657 | rc = ntb_read_remote_spad(ndev, MW0_SZ, &val); | |
658 | if (rc) { | |
659 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ); | |
660 | goto out; | |
661 | } | |
662 | ||
663 | if (!val) | |
664 | goto out; | |
665 | dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val); | |
666 | ||
667 | rc = ntb_set_mw(nt, 0, val); | |
668 | if (rc) | |
669 | goto out; | |
670 | ||
671 | rc = ntb_read_remote_spad(ndev, MW1_SZ, &val); | |
672 | if (rc) { | |
673 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ); | |
674 | goto out; | |
675 | } | |
676 | ||
677 | if (!val) | |
678 | goto out; | |
679 | dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val); | |
680 | ||
681 | rc = ntb_set_mw(nt, 1, val); | |
682 | if (rc) | |
683 | goto out; | |
684 | ||
685 | nt->transport_link = NTB_LINK_UP; | |
686 | ||
687 | for (i = 0; i < nt->max_qps; i++) { | |
688 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
689 | ||
690 | ntb_transport_setup_qp_mw(nt, i); | |
691 | ||
692 | if (qp->client_ready == NTB_LINK_UP) | |
693 | schedule_delayed_work(&qp->link_work, 0); | |
694 | } | |
695 | ||
696 | return; | |
697 | ||
698 | out: | |
699 | if (ntb_hw_link_status(ndev)) | |
700 | schedule_delayed_work(&nt->link_work, | |
701 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
702 | } | |
703 | ||
704 | static void ntb_qp_link_work(struct work_struct *work) | |
705 | { | |
706 | struct ntb_transport_qp *qp = container_of(work, | |
707 | struct ntb_transport_qp, | |
708 | link_work.work); | |
709 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
710 | struct ntb_transport *nt = qp->transport; | |
711 | int rc, val; | |
712 | ||
713 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
714 | ||
715 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
716 | if (rc) { | |
717 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
718 | return; | |
719 | } | |
720 | ||
721 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
722 | if (rc) | |
723 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
724 | val | 1 << qp->qp_num, QP_LINKS); | |
725 | ||
726 | /* query remote spad for qp ready bits */ | |
727 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
728 | if (rc) | |
729 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
730 | ||
731 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
732 | ||
733 | /* See if the remote side is up */ | |
734 | if (1 << qp->qp_num & val) { | |
735 | qp->qp_link = NTB_LINK_UP; | |
736 | ||
737 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
738 | if (qp->event_handler) | |
739 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
740 | } else if (nt->transport_link == NTB_LINK_UP) | |
741 | schedule_delayed_work(&qp->link_work, | |
742 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
743 | } | |
744 | ||
745 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
746 | unsigned int qp_num) | |
747 | { | |
748 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
749 | unsigned int num_qps_mw, tx_size; |
750 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
751 | |
752 | qp = &nt->qps[qp_num]; | |
753 | qp->qp_num = qp_num; | |
754 | qp->transport = nt; | |
755 | qp->ndev = nt->ndev; | |
756 | qp->qp_link = NTB_LINK_DOWN; | |
757 | qp->client_ready = NTB_LINK_DOWN; | |
758 | qp->event_handler = NULL; | |
759 | ||
ef114ed5 JM |
760 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
761 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
762 | else | |
763 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
764 | ||
765 | tx_size = ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; | |
766 | qp->tx_mw_begin = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
767 | (qp_num / NTB_NUM_MW * tx_size); | |
768 | qp->tx_mw_end = qp->tx_mw_begin + tx_size; | |
769 | qp->tx_offset = qp->tx_mw_begin; | |
770 | qp->tx_max_frame = min(transport_mtu, tx_size); | |
771 | ||
fce8a7bb JM |
772 | if (nt->debugfs_dir) { |
773 | char debugfs_name[4]; | |
774 | ||
775 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
776 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
777 | nt->debugfs_dir); | |
778 | ||
779 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
780 | qp->debugfs_dir, qp, | |
781 | &ntb_qp_debugfs_stats); | |
782 | } | |
783 | ||
784 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 785 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
786 | |
787 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
788 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
789 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
790 | ||
791 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
792 | INIT_LIST_HEAD(&qp->rx_free_q); | |
793 | INIT_LIST_HEAD(&qp->tx_free_q); | |
794 | } | |
795 | ||
796 | int ntb_transport_init(struct pci_dev *pdev) | |
797 | { | |
798 | struct ntb_transport *nt; | |
799 | int rc, i; | |
800 | ||
801 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
802 | if (!nt) | |
803 | return -ENOMEM; | |
804 | ||
805 | if (debugfs_initialized()) | |
806 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
807 | else | |
808 | nt->debugfs_dir = NULL; | |
809 | ||
810 | nt->ndev = ntb_register_transport(pdev, nt); | |
811 | if (!nt->ndev) { | |
812 | rc = -EIO; | |
813 | goto err; | |
814 | } | |
815 | ||
816 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
817 | ||
818 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
819 | GFP_KERNEL); | |
820 | if (!nt->qps) { | |
821 | rc = -ENOMEM; | |
822 | goto err1; | |
823 | } | |
824 | ||
825 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
826 | ||
827 | for (i = 0; i < nt->max_qps; i++) | |
828 | ntb_transport_init_queue(nt, i); | |
829 | ||
830 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 831 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
832 | |
833 | rc = ntb_register_event_callback(nt->ndev, | |
834 | ntb_transport_event_callback); | |
835 | if (rc) | |
836 | goto err2; | |
837 | ||
838 | INIT_LIST_HEAD(&nt->client_devs); | |
839 | rc = ntb_bus_init(nt); | |
840 | if (rc) | |
841 | goto err3; | |
842 | ||
843 | if (ntb_hw_link_status(nt->ndev)) | |
844 | schedule_delayed_work(&nt->link_work, 0); | |
845 | ||
846 | return 0; | |
847 | ||
848 | err3: | |
849 | ntb_unregister_event_callback(nt->ndev); | |
850 | err2: | |
851 | kfree(nt->qps); | |
852 | err1: | |
853 | ntb_unregister_transport(nt->ndev); | |
854 | err: | |
855 | debugfs_remove_recursive(nt->debugfs_dir); | |
856 | kfree(nt); | |
857 | return rc; | |
858 | } | |
859 | ||
860 | void ntb_transport_free(void *transport) | |
861 | { | |
862 | struct ntb_transport *nt = transport; | |
863 | struct pci_dev *pdev; | |
864 | int i; | |
865 | ||
866 | nt->transport_link = NTB_LINK_DOWN; | |
867 | ||
868 | /* verify that all the qp's are freed */ | |
869 | for (i = 0; i < nt->max_qps; i++) | |
870 | if (!test_bit(i, &nt->qp_bitmap)) | |
871 | ntb_transport_free_queue(&nt->qps[i]); | |
872 | ||
873 | ntb_bus_remove(nt); | |
874 | ||
875 | cancel_delayed_work_sync(&nt->link_work); | |
876 | ||
877 | debugfs_remove_recursive(nt->debugfs_dir); | |
878 | ||
879 | ntb_unregister_event_callback(nt->ndev); | |
880 | ||
881 | pdev = ntb_query_pdev(nt->ndev); | |
882 | ||
883 | for (i = 0; i < NTB_NUM_MW; i++) | |
884 | if (nt->mw[i].virt_addr) | |
885 | dma_free_coherent(&pdev->dev, nt->mw[i].size, | |
886 | nt->mw[i].virt_addr, | |
887 | nt->mw[i].dma_addr); | |
888 | ||
889 | kfree(nt->qps); | |
890 | ntb_unregister_transport(nt->ndev); | |
891 | kfree(nt); | |
892 | } | |
893 | ||
894 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
895 | struct ntb_queue_entry *entry, void *offset) | |
896 | { | |
897 | ||
898 | struct ntb_payload_header *hdr; | |
899 | ||
900 | BUG_ON(offset < qp->rx_buff_begin || | |
ef114ed5 | 901 | offset + qp->rx_max_frame >= qp->rx_buff_end); |
fce8a7bb | 902 | |
ef114ed5 | 903 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
904 | entry->len = hdr->len; |
905 | ||
906 | memcpy(entry->buf, offset, entry->len); | |
907 | ||
908 | /* Ensure that the data is fully copied out before clearing the flag */ | |
909 | wmb(); | |
910 | hdr->flags = 0; | |
911 | ||
912 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
913 | qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len); | |
914 | ||
915 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
916 | } | |
917 | ||
918 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
919 | { | |
920 | struct ntb_payload_header *hdr; | |
921 | struct ntb_queue_entry *entry; | |
922 | void *offset; | |
923 | ||
924 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
925 | if (!entry) { | |
ef114ed5 | 926 | hdr = offset + qp->rx_max_frame - |
fce8a7bb JM |
927 | sizeof(struct ntb_payload_header); |
928 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
929 | "no buffer - HDR ver %llu, len %d, flags %x\n", | |
930 | hdr->ver, hdr->len, hdr->flags); | |
931 | qp->rx_err_no_buf++; | |
932 | return -ENOMEM; | |
933 | } | |
934 | ||
935 | offset = qp->rx_offset; | |
ef114ed5 | 936 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
937 | |
938 | if (!(hdr->flags & DESC_DONE_FLAG)) { | |
939 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 940 | &qp->rx_pend_q); |
fce8a7bb JM |
941 | qp->rx_ring_empty++; |
942 | return -EAGAIN; | |
943 | } | |
944 | ||
945 | if (hdr->ver != qp->rx_pkts) { | |
946 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
947 | "qp %d: version mismatch, expected %llu - got %llu\n", | |
948 | qp->qp_num, qp->rx_pkts, hdr->ver); | |
949 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 950 | &qp->rx_pend_q); |
fce8a7bb JM |
951 | qp->rx_err_ver++; |
952 | return -EIO; | |
953 | } | |
954 | ||
955 | if (hdr->flags & LINK_DOWN_FLAG) { | |
956 | ntb_qp_link_down(qp); | |
957 | ||
958 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 959 | &qp->rx_pend_q); |
fce8a7bb JM |
960 | |
961 | /* Ensure that the data is fully copied out before clearing the | |
962 | * done flag | |
963 | */ | |
964 | wmb(); | |
965 | hdr->flags = 0; | |
966 | goto out; | |
967 | } | |
968 | ||
969 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
970 | "rx offset %p, ver %llu - %d payload received, buf size %d\n", | |
971 | qp->rx_offset, hdr->ver, hdr->len, entry->len); | |
972 | ||
973 | if (hdr->len <= entry->len) | |
974 | ntb_rx_copy_task(qp, entry, offset); | |
975 | else { | |
976 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 977 | &qp->rx_pend_q); |
fce8a7bb JM |
978 | |
979 | /* Ensure that the data is fully copied out before clearing the | |
980 | * done flag | |
981 | */ | |
982 | wmb(); | |
983 | hdr->flags = 0; | |
984 | qp->rx_err_oflow++; | |
985 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
986 | "RX overflow! Wanted %d got %d\n", | |
987 | hdr->len, entry->len); | |
988 | } | |
989 | ||
990 | qp->rx_bytes += hdr->len; | |
991 | qp->rx_pkts++; | |
992 | ||
993 | out: | |
ef114ed5 JM |
994 | qp->rx_offset += qp->rx_max_frame; |
995 | if (qp->rx_offset + qp->rx_max_frame >= qp->rx_buff_end) | |
fce8a7bb JM |
996 | qp->rx_offset = qp->rx_buff_begin; |
997 | ||
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static void ntb_transport_rx(unsigned long data) | |
1002 | { | |
1003 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
1004 | int rc; | |
1005 | ||
1006 | do { | |
1007 | rc = ntb_process_rxc(qp); | |
1008 | } while (!rc); | |
1009 | } | |
1010 | ||
1011 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1012 | { | |
1013 | struct ntb_transport_qp *qp = data; | |
1014 | ||
1015 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1016 | __func__, db_num); | |
1017 | ||
1018 | tasklet_schedule(&qp->rx_work); | |
1019 | } | |
1020 | ||
1021 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1022 | struct ntb_queue_entry *entry, | |
1023 | void *offset) | |
1024 | { | |
1025 | struct ntb_payload_header *hdr; | |
1026 | ||
1027 | BUG_ON(offset < qp->tx_mw_begin || | |
ef114ed5 | 1028 | offset + qp->tx_max_frame >= qp->tx_mw_end); |
fce8a7bb JM |
1029 | |
1030 | memcpy_toio(offset, entry->buf, entry->len); | |
1031 | ||
ef114ed5 | 1032 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1033 | hdr->len = entry->len; |
1034 | hdr->ver = qp->tx_pkts; | |
1035 | ||
1036 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1037 | wmb(); |
fce8a7bb JM |
1038 | hdr->flags = entry->flags | DESC_DONE_FLAG; |
1039 | ||
1040 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1041 | ||
1042 | /* The entry length can only be zero if the packet is intended to be a | |
1043 | * "link down" or similar. Since no payload is being sent in these | |
1044 | * cases, there is nothing to add to the completion queue. | |
1045 | */ | |
1046 | if (entry->len > 0) { | |
1047 | qp->tx_bytes += entry->len; | |
1048 | ||
1049 | if (qp->tx_handler) | |
1050 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1051 | entry->len); | |
1052 | } | |
1053 | ||
1054 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1055 | } | |
1056 | ||
1057 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1058 | struct ntb_queue_entry *entry) | |
1059 | { | |
1060 | struct ntb_payload_header *hdr; | |
1061 | void *offset; | |
1062 | ||
1063 | offset = qp->tx_offset; | |
ef114ed5 | 1064 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1065 | |
1066 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %p, entry len %d flags %x buff %p\n", | |
f766755c JM |
1067 | qp->tx_pkts, offset, qp->tx_offset, entry->len, entry->flags, |
1068 | entry->buf); | |
fce8a7bb JM |
1069 | if (hdr->flags) { |
1070 | qp->tx_ring_full++; | |
1071 | return -EAGAIN; | |
1072 | } | |
1073 | ||
ef114ed5 | 1074 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1075 | if (qp->tx_handler) |
1076 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1077 | ||
1078 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1079 | &qp->tx_free_q); | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | ntb_tx_copy_task(qp, entry, offset); | |
1084 | ||
ef114ed5 JM |
1085 | qp->tx_offset += qp->tx_max_frame; |
1086 | if (qp->tx_offset + qp->tx_max_frame >= qp->tx_mw_end) | |
fce8a7bb JM |
1087 | qp->tx_offset = qp->tx_mw_begin; |
1088 | ||
1089 | qp->tx_pkts++; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1095 | { | |
1096 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1097 | struct ntb_queue_entry *entry; | |
1098 | int i, rc; | |
1099 | ||
1100 | if (qp->qp_link == NTB_LINK_DOWN) | |
1101 | return; | |
1102 | ||
1103 | qp->qp_link = NTB_LINK_DOWN; | |
1104 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1105 | ||
1106 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1107 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1108 | if (entry) |
1109 | break; | |
1110 | msleep(100); | |
1111 | } | |
1112 | ||
1113 | if (!entry) | |
1114 | return; | |
1115 | ||
1116 | entry->cb_data = NULL; | |
1117 | entry->buf = NULL; | |
1118 | entry->len = 0; | |
1119 | entry->flags = LINK_DOWN_FLAG; | |
1120 | ||
1121 | rc = ntb_process_tx(qp, entry); | |
1122 | if (rc) | |
1123 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1124 | qp->qp_num); | |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1129 | * @rx_handler: receive callback function | |
1130 | * @tx_handler: transmit callback function | |
1131 | * @event_handler: event callback function | |
1132 | * | |
1133 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1134 | * routine for both transmit and receive. The receive callback routine will be | |
1135 | * used to pass up data when the transport has received it on the queue. The | |
1136 | * transmit callback routine will be called when the transport has completed the | |
1137 | * transmission of the data on the queue and the data is ready to be freed. | |
1138 | * | |
1139 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1140 | */ | |
1141 | struct ntb_transport_qp * | |
1142 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1143 | const struct ntb_queue_handlers *handlers) | |
1144 | { | |
1145 | struct ntb_queue_entry *entry; | |
1146 | struct ntb_transport_qp *qp; | |
1147 | struct ntb_transport *nt; | |
1148 | unsigned int free_queue; | |
1149 | int rc, i; | |
1150 | ||
1151 | nt = ntb_find_transport(pdev); | |
1152 | if (!nt) | |
1153 | goto err; | |
1154 | ||
1155 | free_queue = ffs(nt->qp_bitmap); | |
1156 | if (!free_queue) | |
1157 | goto err; | |
1158 | ||
1159 | /* decrement free_queue to make it zero based */ | |
1160 | free_queue--; | |
1161 | ||
1162 | clear_bit(free_queue, &nt->qp_bitmap); | |
1163 | ||
1164 | qp = &nt->qps[free_queue]; | |
1165 | qp->cb_data = data; | |
1166 | qp->rx_handler = handlers->rx_handler; | |
1167 | qp->tx_handler = handlers->tx_handler; | |
1168 | qp->event_handler = handlers->event_handler; | |
1169 | ||
1170 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1171 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1172 | if (!entry) | |
1173 | goto err1; | |
1174 | ||
1175 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
f766755c | 1176 | &qp->rx_free_q); |
fce8a7bb JM |
1177 | } |
1178 | ||
1179 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1180 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1181 | if (!entry) | |
1182 | goto err2; | |
1183 | ||
1184 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
f766755c | 1185 | &qp->tx_free_q); |
fce8a7bb JM |
1186 | } |
1187 | ||
1188 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1189 | ||
1190 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1191 | ntb_transport_rxc_db); | |
1192 | if (rc) | |
1193 | goto err3; | |
1194 | ||
1195 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1196 | ||
1197 | return qp; | |
1198 | ||
1199 | err3: | |
1200 | tasklet_disable(&qp->rx_work); | |
1201 | err2: | |
f766755c | 1202 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1203 | kfree(entry); |
1204 | err1: | |
f766755c | 1205 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1206 | kfree(entry); |
1207 | set_bit(free_queue, &nt->qp_bitmap); | |
1208 | err: | |
1209 | return NULL; | |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1212 | ||
1213 | /** | |
1214 | * ntb_transport_free_queue - Frees NTB transport queue | |
1215 | * @qp: NTB queue to be freed | |
1216 | * | |
1217 | * Frees NTB transport queue | |
1218 | */ | |
1219 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1220 | { | |
1221 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1222 | struct ntb_queue_entry *entry; | |
1223 | ||
1224 | if (!qp) | |
1225 | return; | |
1226 | ||
1227 | cancel_delayed_work_sync(&qp->link_work); | |
1228 | ||
1229 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1230 | tasklet_disable(&qp->rx_work); | |
1231 | ||
f766755c | 1232 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1233 | kfree(entry); |
1234 | ||
f766755c | 1235 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1236 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1237 | kfree(entry); | |
1238 | } | |
1239 | ||
f766755c | 1240 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1241 | kfree(entry); |
1242 | ||
1243 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1244 | ||
1245 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1246 | } | |
1247 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1248 | ||
1249 | /** | |
1250 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1251 | * @qp: NTB queue to be freed | |
1252 | * @len: pointer to variable to write enqueued buffers length | |
1253 | * | |
1254 | * Dequeues unused buffers from receive queue. Should only be used during | |
1255 | * shutdown of qp. | |
1256 | * | |
1257 | * RETURNS: NULL error value on error, or void* for success. | |
1258 | */ | |
1259 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1260 | { | |
1261 | struct ntb_queue_entry *entry; | |
1262 | void *buf; | |
1263 | ||
1264 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1265 | return NULL; | |
1266 | ||
1267 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1268 | if (!entry) | |
1269 | return NULL; | |
1270 | ||
1271 | buf = entry->cb_data; | |
1272 | *len = entry->len; | |
1273 | ||
f766755c | 1274 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1275 | |
1276 | return buf; | |
1277 | } | |
1278 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1279 | ||
1280 | /** | |
1281 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1282 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1283 | * @cb: per buffer pointer for callback function to use | |
1284 | * @data: pointer to data buffer that incoming packets will be copied into | |
1285 | * @len: length of the data buffer | |
1286 | * | |
1287 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1288 | * payload can be received into. | |
1289 | * | |
1290 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1291 | */ | |
1292 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1293 | unsigned int len) | |
1294 | { | |
1295 | struct ntb_queue_entry *entry; | |
1296 | ||
1297 | if (!qp) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1301 | if (!entry) | |
1302 | return -ENOMEM; | |
1303 | ||
1304 | entry->cb_data = cb; | |
1305 | entry->buf = data; | |
1306 | entry->len = len; | |
1307 | ||
f766755c | 1308 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1309 | |
1310 | return 0; | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1313 | ||
1314 | /** | |
1315 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1316 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1317 | * @cb: per buffer pointer for callback function to use | |
1318 | * @data: pointer to data buffer that will be sent | |
1319 | * @len: length of the data buffer | |
1320 | * | |
1321 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1322 | * payload will be transmitted. This assumes that a lock is behing held to | |
1323 | * serialize access to the qp. | |
1324 | * | |
1325 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1326 | */ | |
1327 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1328 | unsigned int len) | |
1329 | { | |
1330 | struct ntb_queue_entry *entry; | |
1331 | int rc; | |
1332 | ||
1333 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1337 | if (!entry) | |
1338 | return -ENOMEM; | |
1339 | ||
1340 | entry->cb_data = cb; | |
1341 | entry->buf = data; | |
1342 | entry->len = len; | |
1343 | entry->flags = 0; | |
1344 | ||
1345 | rc = ntb_process_tx(qp, entry); | |
1346 | if (rc) | |
1347 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1348 | &qp->tx_free_q); | |
1349 | ||
1350 | return rc; | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1353 | ||
1354 | /** | |
1355 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1356 | * @qp: NTB transport layer queue to be enabled | |
1357 | * | |
1358 | * Notify NTB transport layer of client readiness to use queue | |
1359 | */ | |
1360 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1361 | { | |
1362 | if (!qp) | |
1363 | return; | |
1364 | ||
1365 | qp->client_ready = NTB_LINK_UP; | |
1366 | ||
1367 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1368 | schedule_delayed_work(&qp->link_work, 0); | |
1369 | } | |
1370 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1371 | ||
1372 | /** | |
1373 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1374 | * @qp: NTB transport layer queue to be disabled | |
1375 | * | |
1376 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1377 | * transport queue specified. It is the client's responsibility to ensure all | |
1378 | * entries on queue are purged or otherwise handled appropraitely. | |
1379 | */ | |
1380 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1381 | { | |
1382 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1383 | int rc, val; | |
1384 | ||
1385 | if (!qp) | |
1386 | return; | |
1387 | ||
1388 | qp->client_ready = NTB_LINK_DOWN; | |
1389 | ||
1390 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1391 | if (rc) { | |
1392 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1397 | val & ~(1 << qp->qp_num)); | |
1398 | if (rc) | |
1399 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1400 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1401 | ||
1402 | if (qp->qp_link == NTB_LINK_UP) | |
1403 | ntb_send_link_down(qp); | |
1404 | else | |
1405 | cancel_delayed_work_sync(&qp->link_work); | |
1406 | } | |
1407 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1408 | ||
1409 | /** | |
1410 | * ntb_transport_link_query - Query transport link state | |
1411 | * @qp: NTB transport layer queue to be queried | |
1412 | * | |
1413 | * Query connectivity to the remote system of the NTB transport queue | |
1414 | * | |
1415 | * RETURNS: true for link up or false for link down | |
1416 | */ | |
1417 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1418 | { | |
1419 | return qp->qp_link == NTB_LINK_UP; | |
1420 | } | |
1421 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1422 | ||
1423 | /** | |
1424 | * ntb_transport_qp_num - Query the qp number | |
1425 | * @qp: NTB transport layer queue to be queried | |
1426 | * | |
1427 | * Query qp number of the NTB transport queue | |
1428 | * | |
1429 | * RETURNS: a zero based number specifying the qp number | |
1430 | */ | |
1431 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1432 | { | |
1433 | return qp->qp_num; | |
1434 | } | |
1435 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1436 | ||
1437 | /** | |
1438 | * ntb_transport_max_size - Query the max payload size of a qp | |
1439 | * @qp: NTB transport layer queue to be queried | |
1440 | * | |
1441 | * Query the maximum payload size permissible on the given qp | |
1442 | * | |
1443 | * RETURNS: the max payload size of a qp | |
1444 | */ | |
ef114ed5 | 1445 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1446 | { |
ef114ed5 | 1447 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1448 | } |
1449 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |