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; | |
371 | char buf[1024]; | |
372 | ssize_t ret, out_offset, out_count; | |
373 | ||
374 | out_count = 1024; | |
375 | ||
376 | qp = filp->private_data; | |
377 | out_offset = 0; | |
378 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
379 | "NTB QP stats\n"); | |
380 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
381 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
382 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
383 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
384 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
385 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
386 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
387 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
388 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
389 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
390 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
391 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
392 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
393 | "rx_buff_begin - %p\n", qp->rx_buff_begin); | |
394 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
395 | "rx_offset - \t%p\n", qp->rx_offset); | |
396 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
397 | "rx_buff_end - \t%p\n", qp->rx_buff_end); | |
398 | ||
399 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
400 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
401 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
402 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
403 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
404 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
405 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
406 | "tx_mw_begin - \t%p\n", qp->tx_mw_begin); | |
407 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
408 | "tx_offset - \t%p\n", qp->tx_offset); | |
409 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
410 | "tx_mw_end - \t%p\n", qp->tx_mw_end); | |
411 | ||
412 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
413 | "QP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? | |
414 | "Up" : "Down"); | |
415 | ||
416 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
417 | return ret; | |
418 | } | |
419 | ||
420 | static const struct file_operations ntb_qp_debugfs_stats = { | |
421 | .owner = THIS_MODULE, | |
d66d7ac2 | 422 | .open = simple_open, |
fce8a7bb JM |
423 | .read = debugfs_read, |
424 | }; | |
425 | ||
426 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
427 | struct list_head *list) | |
428 | { | |
429 | unsigned long flags; | |
430 | ||
431 | spin_lock_irqsave(lock, flags); | |
432 | list_add_tail(entry, list); | |
433 | spin_unlock_irqrestore(lock, flags); | |
434 | } | |
435 | ||
436 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
437 | struct list_head *list) | |
438 | { | |
439 | struct ntb_queue_entry *entry; | |
440 | unsigned long flags; | |
441 | ||
442 | spin_lock_irqsave(lock, flags); | |
443 | if (list_empty(list)) { | |
444 | entry = NULL; | |
445 | goto out; | |
446 | } | |
447 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
448 | list_del(&entry->entry); | |
449 | out: | |
450 | spin_unlock_irqrestore(lock, flags); | |
451 | ||
452 | return entry; | |
453 | } | |
454 | ||
455 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
456 | unsigned int qp_num) | |
457 | { | |
458 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 459 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 460 | u8 mw_num = QP_TO_MW(qp_num); |
ef114ed5 | 461 | void *offset; |
fce8a7bb JM |
462 | |
463 | WARN_ON(nt->mw[mw_num].virt_addr == 0); | |
464 | ||
ef114ed5 JM |
465 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
466 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
467 | else |
468 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
469 | ||
ef114ed5 | 470 | rx_size = nt->mw[mw_num].size / num_qps_mw; |
fce8a7bb | 471 | qp->rx_buff_begin = nt->mw[mw_num].virt_addr + |
ef114ed5 JM |
472 | (qp_num / NTB_NUM_MW * rx_size); |
473 | qp->rx_buff_end = qp->rx_buff_begin + rx_size; | |
fce8a7bb | 474 | qp->rx_offset = qp->rx_buff_begin; |
ef114ed5 | 475 | qp->rx_max_frame = min(transport_mtu, rx_size); |
fce8a7bb | 476 | |
ef114ed5 JM |
477 | /* setup the hdr offsets with 0's */ |
478 | for (offset = qp->rx_buff_begin + qp->rx_max_frame - | |
479 | sizeof(struct ntb_payload_header); | |
480 | offset < qp->rx_buff_end; offset += qp->rx_max_frame) | |
481 | memset(offset, 0, sizeof(struct ntb_payload_header)); | |
fce8a7bb JM |
482 | |
483 | qp->rx_pkts = 0; | |
484 | qp->tx_pkts = 0; | |
485 | } | |
486 | ||
487 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
488 | { | |
489 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
490 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb JM |
491 | |
492 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
493 | mw->size = ALIGN(size, 4096); | |
494 | ||
495 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
496 | GFP_KERNEL); | |
497 | if (!mw->virt_addr) { | |
498 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
499 | (int) mw->size); | |
500 | return -ENOMEM; | |
501 | } | |
502 | ||
fce8a7bb JM |
503 | /* Notify HW the memory location of the receive buffer */ |
504 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
7b4f2d3c | 509 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 510 | { |
7b4f2d3c JM |
511 | struct ntb_transport_qp *qp = container_of(work, |
512 | struct ntb_transport_qp, | |
513 | link_cleanup); | |
fce8a7bb JM |
514 | struct ntb_transport *nt = qp->transport; |
515 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
516 | ||
517 | if (qp->qp_link == NTB_LINK_DOWN) { | |
518 | cancel_delayed_work_sync(&qp->link_work); | |
519 | return; | |
520 | } | |
521 | ||
522 | if (qp->event_handler) | |
523 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
524 | ||
525 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
526 | qp->qp_link = NTB_LINK_DOWN; | |
527 | ||
528 | if (nt->transport_link == NTB_LINK_UP) | |
529 | schedule_delayed_work(&qp->link_work, | |
530 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
531 | } | |
532 | ||
7b4f2d3c JM |
533 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
534 | { | |
535 | schedule_work(&qp->link_cleanup); | |
536 | } | |
537 | ||
538 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 539 | { |
7b4f2d3c JM |
540 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
541 | link_cleanup); | |
fce8a7bb JM |
542 | int i; |
543 | ||
544 | if (nt->transport_link == NTB_LINK_DOWN) | |
545 | cancel_delayed_work_sync(&nt->link_work); | |
546 | else | |
547 | nt->transport_link = NTB_LINK_DOWN; | |
548 | ||
549 | /* Pass along the info to any clients */ | |
550 | for (i = 0; i < nt->max_qps; i++) | |
551 | if (!test_bit(i, &nt->qp_bitmap)) | |
552 | ntb_qp_link_down(&nt->qps[i]); | |
553 | ||
554 | /* The scratchpad registers keep the values if the remote side | |
555 | * goes down, blast them now to give them a sane value the next | |
556 | * time they are accessed | |
557 | */ | |
558 | for (i = 0; i < MAX_SPAD; i++) | |
559 | ntb_write_local_spad(nt->ndev, i, 0); | |
560 | } | |
561 | ||
562 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
563 | { | |
564 | struct ntb_transport *nt = data; | |
565 | ||
566 | switch (event) { | |
567 | case NTB_EVENT_HW_LINK_UP: | |
568 | schedule_delayed_work(&nt->link_work, 0); | |
569 | break; | |
570 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 571 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
572 | break; |
573 | default: | |
574 | BUG(); | |
575 | } | |
576 | } | |
577 | ||
578 | static void ntb_transport_link_work(struct work_struct *work) | |
579 | { | |
580 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
581 | link_work.work); | |
582 | struct ntb_device *ndev = nt->ndev; | |
583 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
584 | u32 val; | |
585 | int rc, i; | |
586 | ||
587 | /* send the local info */ | |
588 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); | |
589 | if (rc) { | |
590 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
591 | 0, VERSION); | |
592 | goto out; | |
593 | } | |
594 | ||
595 | rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0)); | |
596 | if (rc) { | |
597 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
598 | (u32) ntb_get_mw_size(ndev, 0), MW0_SZ); | |
599 | goto out; | |
600 | } | |
601 | ||
602 | rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1)); | |
603 | if (rc) { | |
604 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
605 | (u32) ntb_get_mw_size(ndev, 1), MW1_SZ); | |
606 | goto out; | |
607 | } | |
608 | ||
609 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
610 | if (rc) { | |
611 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
612 | nt->max_qps, NUM_QPS); | |
613 | goto out; | |
614 | } | |
615 | ||
616 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
617 | if (rc) { | |
618 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
619 | goto out; | |
620 | } | |
621 | ||
622 | rc = ntb_write_remote_spad(ndev, QP_LINKS, val); | |
623 | if (rc) { | |
624 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
625 | val, QP_LINKS); | |
626 | goto out; | |
627 | } | |
628 | ||
629 | /* Query the remote side for its info */ | |
630 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
631 | if (rc) { | |
632 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
633 | goto out; | |
634 | } | |
635 | ||
636 | if (val != NTB_TRANSPORT_VERSION) | |
637 | goto out; | |
638 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
639 | ||
640 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
641 | if (rc) { | |
642 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
643 | goto out; | |
644 | } | |
645 | ||
646 | if (val != nt->max_qps) | |
647 | goto out; | |
648 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
649 | ||
650 | rc = ntb_read_remote_spad(ndev, MW0_SZ, &val); | |
651 | if (rc) { | |
652 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ); | |
653 | goto out; | |
654 | } | |
655 | ||
656 | if (!val) | |
657 | goto out; | |
658 | dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val); | |
659 | ||
660 | rc = ntb_set_mw(nt, 0, val); | |
661 | if (rc) | |
662 | goto out; | |
663 | ||
664 | rc = ntb_read_remote_spad(ndev, MW1_SZ, &val); | |
665 | if (rc) { | |
666 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ); | |
667 | goto out; | |
668 | } | |
669 | ||
670 | if (!val) | |
671 | goto out; | |
672 | dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val); | |
673 | ||
674 | rc = ntb_set_mw(nt, 1, val); | |
675 | if (rc) | |
676 | goto out; | |
677 | ||
678 | nt->transport_link = NTB_LINK_UP; | |
679 | ||
680 | for (i = 0; i < nt->max_qps; i++) { | |
681 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
682 | ||
683 | ntb_transport_setup_qp_mw(nt, i); | |
684 | ||
685 | if (qp->client_ready == NTB_LINK_UP) | |
686 | schedule_delayed_work(&qp->link_work, 0); | |
687 | } | |
688 | ||
689 | return; | |
690 | ||
691 | out: | |
692 | if (ntb_hw_link_status(ndev)) | |
693 | schedule_delayed_work(&nt->link_work, | |
694 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
695 | } | |
696 | ||
697 | static void ntb_qp_link_work(struct work_struct *work) | |
698 | { | |
699 | struct ntb_transport_qp *qp = container_of(work, | |
700 | struct ntb_transport_qp, | |
701 | link_work.work); | |
702 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
703 | struct ntb_transport *nt = qp->transport; | |
704 | int rc, val; | |
705 | ||
706 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
707 | ||
708 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
709 | if (rc) { | |
710 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
711 | return; | |
712 | } | |
713 | ||
714 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
715 | if (rc) | |
716 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
717 | val | 1 << qp->qp_num, QP_LINKS); | |
718 | ||
719 | /* query remote spad for qp ready bits */ | |
720 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
721 | if (rc) | |
722 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
723 | ||
724 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
725 | ||
726 | /* See if the remote side is up */ | |
727 | if (1 << qp->qp_num & val) { | |
728 | qp->qp_link = NTB_LINK_UP; | |
729 | ||
730 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
731 | if (qp->event_handler) | |
732 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
733 | } else if (nt->transport_link == NTB_LINK_UP) | |
734 | schedule_delayed_work(&qp->link_work, | |
735 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
736 | } | |
737 | ||
738 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
739 | unsigned int qp_num) | |
740 | { | |
741 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
742 | unsigned int num_qps_mw, tx_size; |
743 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
744 | |
745 | qp = &nt->qps[qp_num]; | |
746 | qp->qp_num = qp_num; | |
747 | qp->transport = nt; | |
748 | qp->ndev = nt->ndev; | |
749 | qp->qp_link = NTB_LINK_DOWN; | |
750 | qp->client_ready = NTB_LINK_DOWN; | |
751 | qp->event_handler = NULL; | |
752 | ||
ef114ed5 JM |
753 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
754 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
755 | else | |
756 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
757 | ||
758 | tx_size = ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; | |
759 | qp->tx_mw_begin = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
760 | (qp_num / NTB_NUM_MW * tx_size); | |
761 | qp->tx_mw_end = qp->tx_mw_begin + tx_size; | |
762 | qp->tx_offset = qp->tx_mw_begin; | |
763 | qp->tx_max_frame = min(transport_mtu, tx_size); | |
764 | ||
fce8a7bb JM |
765 | if (nt->debugfs_dir) { |
766 | char debugfs_name[4]; | |
767 | ||
768 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
769 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
770 | nt->debugfs_dir); | |
771 | ||
772 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
773 | qp->debugfs_dir, qp, | |
774 | &ntb_qp_debugfs_stats); | |
775 | } | |
776 | ||
777 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 778 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
779 | |
780 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
781 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
782 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
783 | ||
784 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
785 | INIT_LIST_HEAD(&qp->rx_free_q); | |
786 | INIT_LIST_HEAD(&qp->tx_free_q); | |
787 | } | |
788 | ||
789 | int ntb_transport_init(struct pci_dev *pdev) | |
790 | { | |
791 | struct ntb_transport *nt; | |
792 | int rc, i; | |
793 | ||
794 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
795 | if (!nt) | |
796 | return -ENOMEM; | |
797 | ||
798 | if (debugfs_initialized()) | |
799 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
800 | else | |
801 | nt->debugfs_dir = NULL; | |
802 | ||
803 | nt->ndev = ntb_register_transport(pdev, nt); | |
804 | if (!nt->ndev) { | |
805 | rc = -EIO; | |
806 | goto err; | |
807 | } | |
808 | ||
809 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
810 | ||
811 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
812 | GFP_KERNEL); | |
813 | if (!nt->qps) { | |
814 | rc = -ENOMEM; | |
815 | goto err1; | |
816 | } | |
817 | ||
818 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
819 | ||
820 | for (i = 0; i < nt->max_qps; i++) | |
821 | ntb_transport_init_queue(nt, i); | |
822 | ||
823 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 824 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
825 | |
826 | rc = ntb_register_event_callback(nt->ndev, | |
827 | ntb_transport_event_callback); | |
828 | if (rc) | |
829 | goto err2; | |
830 | ||
831 | INIT_LIST_HEAD(&nt->client_devs); | |
832 | rc = ntb_bus_init(nt); | |
833 | if (rc) | |
834 | goto err3; | |
835 | ||
836 | if (ntb_hw_link_status(nt->ndev)) | |
837 | schedule_delayed_work(&nt->link_work, 0); | |
838 | ||
839 | return 0; | |
840 | ||
841 | err3: | |
842 | ntb_unregister_event_callback(nt->ndev); | |
843 | err2: | |
844 | kfree(nt->qps); | |
845 | err1: | |
846 | ntb_unregister_transport(nt->ndev); | |
847 | err: | |
848 | debugfs_remove_recursive(nt->debugfs_dir); | |
849 | kfree(nt); | |
850 | return rc; | |
851 | } | |
852 | ||
853 | void ntb_transport_free(void *transport) | |
854 | { | |
855 | struct ntb_transport *nt = transport; | |
856 | struct pci_dev *pdev; | |
857 | int i; | |
858 | ||
859 | nt->transport_link = NTB_LINK_DOWN; | |
860 | ||
861 | /* verify that all the qp's are freed */ | |
862 | for (i = 0; i < nt->max_qps; i++) | |
863 | if (!test_bit(i, &nt->qp_bitmap)) | |
864 | ntb_transport_free_queue(&nt->qps[i]); | |
865 | ||
866 | ntb_bus_remove(nt); | |
867 | ||
868 | cancel_delayed_work_sync(&nt->link_work); | |
869 | ||
870 | debugfs_remove_recursive(nt->debugfs_dir); | |
871 | ||
872 | ntb_unregister_event_callback(nt->ndev); | |
873 | ||
874 | pdev = ntb_query_pdev(nt->ndev); | |
875 | ||
876 | for (i = 0; i < NTB_NUM_MW; i++) | |
877 | if (nt->mw[i].virt_addr) | |
878 | dma_free_coherent(&pdev->dev, nt->mw[i].size, | |
879 | nt->mw[i].virt_addr, | |
880 | nt->mw[i].dma_addr); | |
881 | ||
882 | kfree(nt->qps); | |
883 | ntb_unregister_transport(nt->ndev); | |
884 | kfree(nt); | |
885 | } | |
886 | ||
887 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
888 | struct ntb_queue_entry *entry, void *offset) | |
889 | { | |
890 | ||
891 | struct ntb_payload_header *hdr; | |
892 | ||
893 | BUG_ON(offset < qp->rx_buff_begin || | |
ef114ed5 | 894 | offset + qp->rx_max_frame >= qp->rx_buff_end); |
fce8a7bb | 895 | |
ef114ed5 | 896 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
897 | entry->len = hdr->len; |
898 | ||
899 | memcpy(entry->buf, offset, entry->len); | |
900 | ||
901 | /* Ensure that the data is fully copied out before clearing the flag */ | |
902 | wmb(); | |
903 | hdr->flags = 0; | |
904 | ||
905 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
906 | qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len); | |
907 | ||
908 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
909 | } | |
910 | ||
911 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
912 | { | |
913 | struct ntb_payload_header *hdr; | |
914 | struct ntb_queue_entry *entry; | |
915 | void *offset; | |
916 | ||
917 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
918 | if (!entry) { | |
ef114ed5 | 919 | hdr = offset + qp->rx_max_frame - |
fce8a7bb JM |
920 | sizeof(struct ntb_payload_header); |
921 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
922 | "no buffer - HDR ver %llu, len %d, flags %x\n", | |
923 | hdr->ver, hdr->len, hdr->flags); | |
924 | qp->rx_err_no_buf++; | |
925 | return -ENOMEM; | |
926 | } | |
927 | ||
928 | offset = qp->rx_offset; | |
ef114ed5 | 929 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
930 | |
931 | if (!(hdr->flags & DESC_DONE_FLAG)) { | |
932 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 933 | &qp->rx_pend_q); |
fce8a7bb JM |
934 | qp->rx_ring_empty++; |
935 | return -EAGAIN; | |
936 | } | |
937 | ||
938 | if (hdr->ver != qp->rx_pkts) { | |
939 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
940 | "qp %d: version mismatch, expected %llu - got %llu\n", | |
941 | qp->qp_num, qp->rx_pkts, hdr->ver); | |
942 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 943 | &qp->rx_pend_q); |
fce8a7bb JM |
944 | qp->rx_err_ver++; |
945 | return -EIO; | |
946 | } | |
947 | ||
948 | if (hdr->flags & LINK_DOWN_FLAG) { | |
949 | ntb_qp_link_down(qp); | |
950 | ||
951 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 952 | &qp->rx_pend_q); |
fce8a7bb JM |
953 | |
954 | /* Ensure that the data is fully copied out before clearing the | |
955 | * done flag | |
956 | */ | |
957 | wmb(); | |
958 | hdr->flags = 0; | |
959 | goto out; | |
960 | } | |
961 | ||
962 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
963 | "rx offset %p, ver %llu - %d payload received, buf size %d\n", | |
964 | qp->rx_offset, hdr->ver, hdr->len, entry->len); | |
965 | ||
966 | if (hdr->len <= entry->len) | |
967 | ntb_rx_copy_task(qp, entry, offset); | |
968 | else { | |
969 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 970 | &qp->rx_pend_q); |
fce8a7bb JM |
971 | |
972 | /* Ensure that the data is fully copied out before clearing the | |
973 | * done flag | |
974 | */ | |
975 | wmb(); | |
976 | hdr->flags = 0; | |
977 | qp->rx_err_oflow++; | |
978 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
979 | "RX overflow! Wanted %d got %d\n", | |
980 | hdr->len, entry->len); | |
981 | } | |
982 | ||
983 | qp->rx_bytes += hdr->len; | |
984 | qp->rx_pkts++; | |
985 | ||
986 | out: | |
ef114ed5 JM |
987 | qp->rx_offset += qp->rx_max_frame; |
988 | if (qp->rx_offset + qp->rx_max_frame >= qp->rx_buff_end) | |
fce8a7bb JM |
989 | qp->rx_offset = qp->rx_buff_begin; |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | static void ntb_transport_rx(unsigned long data) | |
995 | { | |
996 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
997 | int rc; | |
998 | ||
999 | do { | |
1000 | rc = ntb_process_rxc(qp); | |
1001 | } while (!rc); | |
1002 | } | |
1003 | ||
1004 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1005 | { | |
1006 | struct ntb_transport_qp *qp = data; | |
1007 | ||
1008 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1009 | __func__, db_num); | |
1010 | ||
1011 | tasklet_schedule(&qp->rx_work); | |
1012 | } | |
1013 | ||
1014 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1015 | struct ntb_queue_entry *entry, | |
1016 | void *offset) | |
1017 | { | |
1018 | struct ntb_payload_header *hdr; | |
1019 | ||
1020 | BUG_ON(offset < qp->tx_mw_begin || | |
ef114ed5 | 1021 | offset + qp->tx_max_frame >= qp->tx_mw_end); |
fce8a7bb JM |
1022 | |
1023 | memcpy_toio(offset, entry->buf, entry->len); | |
1024 | ||
ef114ed5 | 1025 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1026 | hdr->len = entry->len; |
1027 | hdr->ver = qp->tx_pkts; | |
1028 | ||
1029 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1030 | wmb(); |
fce8a7bb JM |
1031 | hdr->flags = entry->flags | DESC_DONE_FLAG; |
1032 | ||
1033 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1034 | ||
1035 | /* The entry length can only be zero if the packet is intended to be a | |
1036 | * "link down" or similar. Since no payload is being sent in these | |
1037 | * cases, there is nothing to add to the completion queue. | |
1038 | */ | |
1039 | if (entry->len > 0) { | |
1040 | qp->tx_bytes += entry->len; | |
1041 | ||
1042 | if (qp->tx_handler) | |
1043 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1044 | entry->len); | |
1045 | } | |
1046 | ||
1047 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1048 | } | |
1049 | ||
1050 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1051 | struct ntb_queue_entry *entry) | |
1052 | { | |
1053 | struct ntb_payload_header *hdr; | |
1054 | void *offset; | |
1055 | ||
1056 | offset = qp->tx_offset; | |
ef114ed5 | 1057 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1058 | |
1059 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %p, entry len %d flags %x buff %p\n", | |
f766755c JM |
1060 | qp->tx_pkts, offset, qp->tx_offset, entry->len, entry->flags, |
1061 | entry->buf); | |
fce8a7bb JM |
1062 | if (hdr->flags) { |
1063 | qp->tx_ring_full++; | |
1064 | return -EAGAIN; | |
1065 | } | |
1066 | ||
ef114ed5 | 1067 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1068 | if (qp->tx_handler) |
1069 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1070 | ||
1071 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1072 | &qp->tx_free_q); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | ntb_tx_copy_task(qp, entry, offset); | |
1077 | ||
ef114ed5 JM |
1078 | qp->tx_offset += qp->tx_max_frame; |
1079 | if (qp->tx_offset + qp->tx_max_frame >= qp->tx_mw_end) | |
fce8a7bb JM |
1080 | qp->tx_offset = qp->tx_mw_begin; |
1081 | ||
1082 | qp->tx_pkts++; | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1088 | { | |
1089 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1090 | struct ntb_queue_entry *entry; | |
1091 | int i, rc; | |
1092 | ||
1093 | if (qp->qp_link == NTB_LINK_DOWN) | |
1094 | return; | |
1095 | ||
1096 | qp->qp_link = NTB_LINK_DOWN; | |
1097 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1098 | ||
1099 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1100 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1101 | if (entry) |
1102 | break; | |
1103 | msleep(100); | |
1104 | } | |
1105 | ||
1106 | if (!entry) | |
1107 | return; | |
1108 | ||
1109 | entry->cb_data = NULL; | |
1110 | entry->buf = NULL; | |
1111 | entry->len = 0; | |
1112 | entry->flags = LINK_DOWN_FLAG; | |
1113 | ||
1114 | rc = ntb_process_tx(qp, entry); | |
1115 | if (rc) | |
1116 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1117 | qp->qp_num); | |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1122 | * @rx_handler: receive callback function | |
1123 | * @tx_handler: transmit callback function | |
1124 | * @event_handler: event callback function | |
1125 | * | |
1126 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1127 | * routine for both transmit and receive. The receive callback routine will be | |
1128 | * used to pass up data when the transport has received it on the queue. The | |
1129 | * transmit callback routine will be called when the transport has completed the | |
1130 | * transmission of the data on the queue and the data is ready to be freed. | |
1131 | * | |
1132 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1133 | */ | |
1134 | struct ntb_transport_qp * | |
1135 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1136 | const struct ntb_queue_handlers *handlers) | |
1137 | { | |
1138 | struct ntb_queue_entry *entry; | |
1139 | struct ntb_transport_qp *qp; | |
1140 | struct ntb_transport *nt; | |
1141 | unsigned int free_queue; | |
1142 | int rc, i; | |
1143 | ||
1144 | nt = ntb_find_transport(pdev); | |
1145 | if (!nt) | |
1146 | goto err; | |
1147 | ||
1148 | free_queue = ffs(nt->qp_bitmap); | |
1149 | if (!free_queue) | |
1150 | goto err; | |
1151 | ||
1152 | /* decrement free_queue to make it zero based */ | |
1153 | free_queue--; | |
1154 | ||
1155 | clear_bit(free_queue, &nt->qp_bitmap); | |
1156 | ||
1157 | qp = &nt->qps[free_queue]; | |
1158 | qp->cb_data = data; | |
1159 | qp->rx_handler = handlers->rx_handler; | |
1160 | qp->tx_handler = handlers->tx_handler; | |
1161 | qp->event_handler = handlers->event_handler; | |
1162 | ||
1163 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1164 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1165 | if (!entry) | |
1166 | goto err1; | |
1167 | ||
1168 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
f766755c | 1169 | &qp->rx_free_q); |
fce8a7bb JM |
1170 | } |
1171 | ||
1172 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1173 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1174 | if (!entry) | |
1175 | goto err2; | |
1176 | ||
1177 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
f766755c | 1178 | &qp->tx_free_q); |
fce8a7bb JM |
1179 | } |
1180 | ||
1181 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1182 | ||
1183 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1184 | ntb_transport_rxc_db); | |
1185 | if (rc) | |
1186 | goto err3; | |
1187 | ||
1188 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1189 | ||
1190 | return qp; | |
1191 | ||
1192 | err3: | |
1193 | tasklet_disable(&qp->rx_work); | |
1194 | err2: | |
f766755c | 1195 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1196 | kfree(entry); |
1197 | err1: | |
f766755c | 1198 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1199 | kfree(entry); |
1200 | set_bit(free_queue, &nt->qp_bitmap); | |
1201 | err: | |
1202 | return NULL; | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1205 | ||
1206 | /** | |
1207 | * ntb_transport_free_queue - Frees NTB transport queue | |
1208 | * @qp: NTB queue to be freed | |
1209 | * | |
1210 | * Frees NTB transport queue | |
1211 | */ | |
1212 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1213 | { | |
1214 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1215 | struct ntb_queue_entry *entry; | |
1216 | ||
1217 | if (!qp) | |
1218 | return; | |
1219 | ||
1220 | cancel_delayed_work_sync(&qp->link_work); | |
1221 | ||
1222 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1223 | tasklet_disable(&qp->rx_work); | |
1224 | ||
f766755c | 1225 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1226 | kfree(entry); |
1227 | ||
f766755c | 1228 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1229 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1230 | kfree(entry); | |
1231 | } | |
1232 | ||
f766755c | 1233 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1234 | kfree(entry); |
1235 | ||
1236 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1237 | ||
1238 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1239 | } | |
1240 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1241 | ||
1242 | /** | |
1243 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1244 | * @qp: NTB queue to be freed | |
1245 | * @len: pointer to variable to write enqueued buffers length | |
1246 | * | |
1247 | * Dequeues unused buffers from receive queue. Should only be used during | |
1248 | * shutdown of qp. | |
1249 | * | |
1250 | * RETURNS: NULL error value on error, or void* for success. | |
1251 | */ | |
1252 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1253 | { | |
1254 | struct ntb_queue_entry *entry; | |
1255 | void *buf; | |
1256 | ||
1257 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1258 | return NULL; | |
1259 | ||
1260 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1261 | if (!entry) | |
1262 | return NULL; | |
1263 | ||
1264 | buf = entry->cb_data; | |
1265 | *len = entry->len; | |
1266 | ||
f766755c | 1267 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1268 | |
1269 | return buf; | |
1270 | } | |
1271 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1272 | ||
1273 | /** | |
1274 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1275 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1276 | * @cb: per buffer pointer for callback function to use | |
1277 | * @data: pointer to data buffer that incoming packets will be copied into | |
1278 | * @len: length of the data buffer | |
1279 | * | |
1280 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1281 | * payload can be received into. | |
1282 | * | |
1283 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1284 | */ | |
1285 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1286 | unsigned int len) | |
1287 | { | |
1288 | struct ntb_queue_entry *entry; | |
1289 | ||
1290 | if (!qp) | |
1291 | return -EINVAL; | |
1292 | ||
1293 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1294 | if (!entry) | |
1295 | return -ENOMEM; | |
1296 | ||
1297 | entry->cb_data = cb; | |
1298 | entry->buf = data; | |
1299 | entry->len = len; | |
1300 | ||
f766755c | 1301 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
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); |