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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 | ||
215 | struct bus_type ntb_bus_type = { | |
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 | ||
367 | static int debugfs_open(struct inode *inode, struct file *filp) | |
368 | { | |
369 | filp->private_data = inode->i_private; | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, | |
374 | loff_t *offp) | |
375 | { | |
376 | struct ntb_transport_qp *qp; | |
377 | char buf[1024]; | |
378 | ssize_t ret, out_offset, out_count; | |
379 | ||
380 | out_count = 1024; | |
381 | ||
382 | qp = filp->private_data; | |
383 | out_offset = 0; | |
384 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
385 | "NTB QP stats\n"); | |
386 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
387 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
388 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
389 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
390 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
391 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
392 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
393 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
394 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
395 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
396 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
397 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
398 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
399 | "rx_buff_begin - %p\n", qp->rx_buff_begin); | |
400 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
401 | "rx_offset - \t%p\n", qp->rx_offset); | |
402 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
403 | "rx_buff_end - \t%p\n", qp->rx_buff_end); | |
404 | ||
405 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
406 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
407 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
408 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
409 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
410 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
411 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
412 | "tx_mw_begin - \t%p\n", qp->tx_mw_begin); | |
413 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
414 | "tx_offset - \t%p\n", qp->tx_offset); | |
415 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
416 | "tx_mw_end - \t%p\n", qp->tx_mw_end); | |
417 | ||
418 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
419 | "QP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? | |
420 | "Up" : "Down"); | |
421 | ||
422 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
423 | return ret; | |
424 | } | |
425 | ||
426 | static const struct file_operations ntb_qp_debugfs_stats = { | |
427 | .owner = THIS_MODULE, | |
428 | .open = debugfs_open, | |
429 | .read = debugfs_read, | |
430 | }; | |
431 | ||
432 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
433 | struct list_head *list) | |
434 | { | |
435 | unsigned long flags; | |
436 | ||
437 | spin_lock_irqsave(lock, flags); | |
438 | list_add_tail(entry, list); | |
439 | spin_unlock_irqrestore(lock, flags); | |
440 | } | |
441 | ||
442 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
443 | struct list_head *list) | |
444 | { | |
445 | struct ntb_queue_entry *entry; | |
446 | unsigned long flags; | |
447 | ||
448 | spin_lock_irqsave(lock, flags); | |
449 | if (list_empty(list)) { | |
450 | entry = NULL; | |
451 | goto out; | |
452 | } | |
453 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
454 | list_del(&entry->entry); | |
455 | out: | |
456 | spin_unlock_irqrestore(lock, flags); | |
457 | ||
458 | return entry; | |
459 | } | |
460 | ||
461 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
462 | unsigned int qp_num) | |
463 | { | |
464 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 465 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 466 | u8 mw_num = QP_TO_MW(qp_num); |
ef114ed5 | 467 | void *offset; |
fce8a7bb JM |
468 | |
469 | WARN_ON(nt->mw[mw_num].virt_addr == 0); | |
470 | ||
ef114ed5 JM |
471 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
472 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
473 | else |
474 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
475 | ||
ef114ed5 | 476 | rx_size = nt->mw[mw_num].size / num_qps_mw; |
fce8a7bb | 477 | qp->rx_buff_begin = nt->mw[mw_num].virt_addr + |
ef114ed5 JM |
478 | (qp_num / NTB_NUM_MW * rx_size); |
479 | qp->rx_buff_end = qp->rx_buff_begin + rx_size; | |
fce8a7bb | 480 | qp->rx_offset = qp->rx_buff_begin; |
ef114ed5 | 481 | qp->rx_max_frame = min(transport_mtu, rx_size); |
fce8a7bb | 482 | |
ef114ed5 JM |
483 | /* setup the hdr offsets with 0's */ |
484 | for (offset = qp->rx_buff_begin + qp->rx_max_frame - | |
485 | sizeof(struct ntb_payload_header); | |
486 | offset < qp->rx_buff_end; offset += qp->rx_max_frame) | |
487 | memset(offset, 0, sizeof(struct ntb_payload_header)); | |
fce8a7bb JM |
488 | |
489 | qp->rx_pkts = 0; | |
490 | qp->tx_pkts = 0; | |
491 | } | |
492 | ||
493 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
494 | { | |
495 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
496 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb JM |
497 | |
498 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
499 | mw->size = ALIGN(size, 4096); | |
500 | ||
501 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
502 | GFP_KERNEL); | |
503 | if (!mw->virt_addr) { | |
504 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
505 | (int) mw->size); | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
fce8a7bb JM |
509 | /* Notify HW the memory location of the receive buffer */ |
510 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
7b4f2d3c | 515 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 516 | { |
7b4f2d3c JM |
517 | struct ntb_transport_qp *qp = container_of(work, |
518 | struct ntb_transport_qp, | |
519 | link_cleanup); | |
fce8a7bb JM |
520 | struct ntb_transport *nt = qp->transport; |
521 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
522 | ||
523 | if (qp->qp_link == NTB_LINK_DOWN) { | |
524 | cancel_delayed_work_sync(&qp->link_work); | |
525 | return; | |
526 | } | |
527 | ||
528 | if (qp->event_handler) | |
529 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
530 | ||
531 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
532 | qp->qp_link = NTB_LINK_DOWN; | |
533 | ||
534 | if (nt->transport_link == NTB_LINK_UP) | |
535 | schedule_delayed_work(&qp->link_work, | |
536 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
537 | } | |
538 | ||
7b4f2d3c JM |
539 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
540 | { | |
541 | schedule_work(&qp->link_cleanup); | |
542 | } | |
543 | ||
544 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 545 | { |
7b4f2d3c JM |
546 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
547 | link_cleanup); | |
fce8a7bb JM |
548 | int i; |
549 | ||
550 | if (nt->transport_link == NTB_LINK_DOWN) | |
551 | cancel_delayed_work_sync(&nt->link_work); | |
552 | else | |
553 | nt->transport_link = NTB_LINK_DOWN; | |
554 | ||
555 | /* Pass along the info to any clients */ | |
556 | for (i = 0; i < nt->max_qps; i++) | |
557 | if (!test_bit(i, &nt->qp_bitmap)) | |
558 | ntb_qp_link_down(&nt->qps[i]); | |
559 | ||
560 | /* The scratchpad registers keep the values if the remote side | |
561 | * goes down, blast them now to give them a sane value the next | |
562 | * time they are accessed | |
563 | */ | |
564 | for (i = 0; i < MAX_SPAD; i++) | |
565 | ntb_write_local_spad(nt->ndev, i, 0); | |
566 | } | |
567 | ||
568 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
569 | { | |
570 | struct ntb_transport *nt = data; | |
571 | ||
572 | switch (event) { | |
573 | case NTB_EVENT_HW_LINK_UP: | |
574 | schedule_delayed_work(&nt->link_work, 0); | |
575 | break; | |
576 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 577 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
578 | break; |
579 | default: | |
580 | BUG(); | |
581 | } | |
582 | } | |
583 | ||
584 | static void ntb_transport_link_work(struct work_struct *work) | |
585 | { | |
586 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
587 | link_work.work); | |
588 | struct ntb_device *ndev = nt->ndev; | |
589 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
590 | u32 val; | |
591 | int rc, i; | |
592 | ||
593 | /* send the local info */ | |
594 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); | |
595 | if (rc) { | |
596 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
597 | 0, VERSION); | |
598 | goto out; | |
599 | } | |
600 | ||
601 | rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0)); | |
602 | if (rc) { | |
603 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
604 | (u32) ntb_get_mw_size(ndev, 0), MW0_SZ); | |
605 | goto out; | |
606 | } | |
607 | ||
608 | rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1)); | |
609 | if (rc) { | |
610 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
611 | (u32) ntb_get_mw_size(ndev, 1), MW1_SZ); | |
612 | goto out; | |
613 | } | |
614 | ||
615 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
616 | if (rc) { | |
617 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
618 | nt->max_qps, NUM_QPS); | |
619 | goto out; | |
620 | } | |
621 | ||
622 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
623 | if (rc) { | |
624 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
625 | goto out; | |
626 | } | |
627 | ||
628 | rc = ntb_write_remote_spad(ndev, QP_LINKS, val); | |
629 | if (rc) { | |
630 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
631 | val, QP_LINKS); | |
632 | goto out; | |
633 | } | |
634 | ||
635 | /* Query the remote side for its info */ | |
636 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
637 | if (rc) { | |
638 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
639 | goto out; | |
640 | } | |
641 | ||
642 | if (val != NTB_TRANSPORT_VERSION) | |
643 | goto out; | |
644 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
645 | ||
646 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
647 | if (rc) { | |
648 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
649 | goto out; | |
650 | } | |
651 | ||
652 | if (val != nt->max_qps) | |
653 | goto out; | |
654 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
655 | ||
656 | rc = ntb_read_remote_spad(ndev, MW0_SZ, &val); | |
657 | if (rc) { | |
658 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ); | |
659 | goto out; | |
660 | } | |
661 | ||
662 | if (!val) | |
663 | goto out; | |
664 | dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val); | |
665 | ||
666 | rc = ntb_set_mw(nt, 0, val); | |
667 | if (rc) | |
668 | goto out; | |
669 | ||
670 | rc = ntb_read_remote_spad(ndev, MW1_SZ, &val); | |
671 | if (rc) { | |
672 | dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ); | |
673 | goto out; | |
674 | } | |
675 | ||
676 | if (!val) | |
677 | goto out; | |
678 | dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val); | |
679 | ||
680 | rc = ntb_set_mw(nt, 1, val); | |
681 | if (rc) | |
682 | goto out; | |
683 | ||
684 | nt->transport_link = NTB_LINK_UP; | |
685 | ||
686 | for (i = 0; i < nt->max_qps; i++) { | |
687 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
688 | ||
689 | ntb_transport_setup_qp_mw(nt, i); | |
690 | ||
691 | if (qp->client_ready == NTB_LINK_UP) | |
692 | schedule_delayed_work(&qp->link_work, 0); | |
693 | } | |
694 | ||
695 | return; | |
696 | ||
697 | out: | |
698 | if (ntb_hw_link_status(ndev)) | |
699 | schedule_delayed_work(&nt->link_work, | |
700 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
701 | } | |
702 | ||
703 | static void ntb_qp_link_work(struct work_struct *work) | |
704 | { | |
705 | struct ntb_transport_qp *qp = container_of(work, | |
706 | struct ntb_transport_qp, | |
707 | link_work.work); | |
708 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
709 | struct ntb_transport *nt = qp->transport; | |
710 | int rc, val; | |
711 | ||
712 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
713 | ||
714 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
715 | if (rc) { | |
716 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
717 | return; | |
718 | } | |
719 | ||
720 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
721 | if (rc) | |
722 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
723 | val | 1 << qp->qp_num, QP_LINKS); | |
724 | ||
725 | /* query remote spad for qp ready bits */ | |
726 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
727 | if (rc) | |
728 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
729 | ||
730 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
731 | ||
732 | /* See if the remote side is up */ | |
733 | if (1 << qp->qp_num & val) { | |
734 | qp->qp_link = NTB_LINK_UP; | |
735 | ||
736 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
737 | if (qp->event_handler) | |
738 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
739 | } else if (nt->transport_link == NTB_LINK_UP) | |
740 | schedule_delayed_work(&qp->link_work, | |
741 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
742 | } | |
743 | ||
744 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
745 | unsigned int qp_num) | |
746 | { | |
747 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
748 | unsigned int num_qps_mw, tx_size; |
749 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
750 | |
751 | qp = &nt->qps[qp_num]; | |
752 | qp->qp_num = qp_num; | |
753 | qp->transport = nt; | |
754 | qp->ndev = nt->ndev; | |
755 | qp->qp_link = NTB_LINK_DOWN; | |
756 | qp->client_ready = NTB_LINK_DOWN; | |
757 | qp->event_handler = NULL; | |
758 | ||
ef114ed5 JM |
759 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
760 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
761 | else | |
762 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
763 | ||
764 | tx_size = ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; | |
765 | qp->tx_mw_begin = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
766 | (qp_num / NTB_NUM_MW * tx_size); | |
767 | qp->tx_mw_end = qp->tx_mw_begin + tx_size; | |
768 | qp->tx_offset = qp->tx_mw_begin; | |
769 | qp->tx_max_frame = min(transport_mtu, tx_size); | |
770 | ||
fce8a7bb JM |
771 | if (nt->debugfs_dir) { |
772 | char debugfs_name[4]; | |
773 | ||
774 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
775 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
776 | nt->debugfs_dir); | |
777 | ||
778 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
779 | qp->debugfs_dir, qp, | |
780 | &ntb_qp_debugfs_stats); | |
781 | } | |
782 | ||
783 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 784 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
785 | |
786 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
787 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
788 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
789 | ||
790 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
791 | INIT_LIST_HEAD(&qp->rx_free_q); | |
792 | INIT_LIST_HEAD(&qp->tx_free_q); | |
793 | } | |
794 | ||
795 | int ntb_transport_init(struct pci_dev *pdev) | |
796 | { | |
797 | struct ntb_transport *nt; | |
798 | int rc, i; | |
799 | ||
800 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
801 | if (!nt) | |
802 | return -ENOMEM; | |
803 | ||
804 | if (debugfs_initialized()) | |
805 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
806 | else | |
807 | nt->debugfs_dir = NULL; | |
808 | ||
809 | nt->ndev = ntb_register_transport(pdev, nt); | |
810 | if (!nt->ndev) { | |
811 | rc = -EIO; | |
812 | goto err; | |
813 | } | |
814 | ||
815 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
816 | ||
817 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
818 | GFP_KERNEL); | |
819 | if (!nt->qps) { | |
820 | rc = -ENOMEM; | |
821 | goto err1; | |
822 | } | |
823 | ||
824 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
825 | ||
826 | for (i = 0; i < nt->max_qps; i++) | |
827 | ntb_transport_init_queue(nt, i); | |
828 | ||
829 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 830 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
831 | |
832 | rc = ntb_register_event_callback(nt->ndev, | |
833 | ntb_transport_event_callback); | |
834 | if (rc) | |
835 | goto err2; | |
836 | ||
837 | INIT_LIST_HEAD(&nt->client_devs); | |
838 | rc = ntb_bus_init(nt); | |
839 | if (rc) | |
840 | goto err3; | |
841 | ||
842 | if (ntb_hw_link_status(nt->ndev)) | |
843 | schedule_delayed_work(&nt->link_work, 0); | |
844 | ||
845 | return 0; | |
846 | ||
847 | err3: | |
848 | ntb_unregister_event_callback(nt->ndev); | |
849 | err2: | |
850 | kfree(nt->qps); | |
851 | err1: | |
852 | ntb_unregister_transport(nt->ndev); | |
853 | err: | |
854 | debugfs_remove_recursive(nt->debugfs_dir); | |
855 | kfree(nt); | |
856 | return rc; | |
857 | } | |
858 | ||
859 | void ntb_transport_free(void *transport) | |
860 | { | |
861 | struct ntb_transport *nt = transport; | |
862 | struct pci_dev *pdev; | |
863 | int i; | |
864 | ||
865 | nt->transport_link = NTB_LINK_DOWN; | |
866 | ||
867 | /* verify that all the qp's are freed */ | |
868 | for (i = 0; i < nt->max_qps; i++) | |
869 | if (!test_bit(i, &nt->qp_bitmap)) | |
870 | ntb_transport_free_queue(&nt->qps[i]); | |
871 | ||
872 | ntb_bus_remove(nt); | |
873 | ||
874 | cancel_delayed_work_sync(&nt->link_work); | |
875 | ||
876 | debugfs_remove_recursive(nt->debugfs_dir); | |
877 | ||
878 | ntb_unregister_event_callback(nt->ndev); | |
879 | ||
880 | pdev = ntb_query_pdev(nt->ndev); | |
881 | ||
882 | for (i = 0; i < NTB_NUM_MW; i++) | |
883 | if (nt->mw[i].virt_addr) | |
884 | dma_free_coherent(&pdev->dev, nt->mw[i].size, | |
885 | nt->mw[i].virt_addr, | |
886 | nt->mw[i].dma_addr); | |
887 | ||
888 | kfree(nt->qps); | |
889 | ntb_unregister_transport(nt->ndev); | |
890 | kfree(nt); | |
891 | } | |
892 | ||
893 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
894 | struct ntb_queue_entry *entry, void *offset) | |
895 | { | |
896 | ||
897 | struct ntb_payload_header *hdr; | |
898 | ||
899 | BUG_ON(offset < qp->rx_buff_begin || | |
ef114ed5 | 900 | offset + qp->rx_max_frame >= qp->rx_buff_end); |
fce8a7bb | 901 | |
ef114ed5 | 902 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
903 | entry->len = hdr->len; |
904 | ||
905 | memcpy(entry->buf, offset, entry->len); | |
906 | ||
907 | /* Ensure that the data is fully copied out before clearing the flag */ | |
908 | wmb(); | |
909 | hdr->flags = 0; | |
910 | ||
911 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
912 | qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len); | |
913 | ||
914 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
915 | } | |
916 | ||
917 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
918 | { | |
919 | struct ntb_payload_header *hdr; | |
920 | struct ntb_queue_entry *entry; | |
921 | void *offset; | |
922 | ||
923 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
924 | if (!entry) { | |
ef114ed5 | 925 | hdr = offset + qp->rx_max_frame - |
fce8a7bb JM |
926 | sizeof(struct ntb_payload_header); |
927 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
928 | "no buffer - HDR ver %llu, len %d, flags %x\n", | |
929 | hdr->ver, hdr->len, hdr->flags); | |
930 | qp->rx_err_no_buf++; | |
931 | return -ENOMEM; | |
932 | } | |
933 | ||
934 | offset = qp->rx_offset; | |
ef114ed5 | 935 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
936 | |
937 | if (!(hdr->flags & DESC_DONE_FLAG)) { | |
938 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
939 | &qp->rx_pend_q); | |
940 | qp->rx_ring_empty++; | |
941 | return -EAGAIN; | |
942 | } | |
943 | ||
944 | if (hdr->ver != qp->rx_pkts) { | |
945 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
946 | "qp %d: version mismatch, expected %llu - got %llu\n", | |
947 | qp->qp_num, qp->rx_pkts, hdr->ver); | |
948 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
949 | &qp->rx_pend_q); | |
950 | qp->rx_err_ver++; | |
951 | return -EIO; | |
952 | } | |
953 | ||
954 | if (hdr->flags & LINK_DOWN_FLAG) { | |
955 | ntb_qp_link_down(qp); | |
956 | ||
957 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
958 | &qp->rx_pend_q); | |
959 | ||
960 | /* Ensure that the data is fully copied out before clearing the | |
961 | * done flag | |
962 | */ | |
963 | wmb(); | |
964 | hdr->flags = 0; | |
965 | goto out; | |
966 | } | |
967 | ||
968 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
969 | "rx offset %p, ver %llu - %d payload received, buf size %d\n", | |
970 | qp->rx_offset, hdr->ver, hdr->len, entry->len); | |
971 | ||
972 | if (hdr->len <= entry->len) | |
973 | ntb_rx_copy_task(qp, entry, offset); | |
974 | else { | |
975 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
976 | &qp->rx_pend_q); | |
977 | ||
978 | /* Ensure that the data is fully copied out before clearing the | |
979 | * done flag | |
980 | */ | |
981 | wmb(); | |
982 | hdr->flags = 0; | |
983 | qp->rx_err_oflow++; | |
984 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
985 | "RX overflow! Wanted %d got %d\n", | |
986 | hdr->len, entry->len); | |
987 | } | |
988 | ||
989 | qp->rx_bytes += hdr->len; | |
990 | qp->rx_pkts++; | |
991 | ||
992 | out: | |
ef114ed5 JM |
993 | qp->rx_offset += qp->rx_max_frame; |
994 | if (qp->rx_offset + qp->rx_max_frame >= qp->rx_buff_end) | |
fce8a7bb JM |
995 | qp->rx_offset = qp->rx_buff_begin; |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | static void ntb_transport_rx(unsigned long data) | |
1001 | { | |
1002 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
1003 | int rc; | |
1004 | ||
1005 | do { | |
1006 | rc = ntb_process_rxc(qp); | |
1007 | } while (!rc); | |
1008 | } | |
1009 | ||
1010 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1011 | { | |
1012 | struct ntb_transport_qp *qp = data; | |
1013 | ||
1014 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1015 | __func__, db_num); | |
1016 | ||
1017 | tasklet_schedule(&qp->rx_work); | |
1018 | } | |
1019 | ||
1020 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1021 | struct ntb_queue_entry *entry, | |
1022 | void *offset) | |
1023 | { | |
1024 | struct ntb_payload_header *hdr; | |
1025 | ||
1026 | BUG_ON(offset < qp->tx_mw_begin || | |
ef114ed5 | 1027 | offset + qp->tx_max_frame >= qp->tx_mw_end); |
fce8a7bb JM |
1028 | |
1029 | memcpy_toio(offset, entry->buf, entry->len); | |
1030 | ||
ef114ed5 | 1031 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1032 | hdr->len = entry->len; |
1033 | hdr->ver = qp->tx_pkts; | |
1034 | ||
1035 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1036 | wmb(); |
fce8a7bb JM |
1037 | hdr->flags = entry->flags | DESC_DONE_FLAG; |
1038 | ||
1039 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1040 | ||
1041 | /* The entry length can only be zero if the packet is intended to be a | |
1042 | * "link down" or similar. Since no payload is being sent in these | |
1043 | * cases, there is nothing to add to the completion queue. | |
1044 | */ | |
1045 | if (entry->len > 0) { | |
1046 | qp->tx_bytes += entry->len; | |
1047 | ||
1048 | if (qp->tx_handler) | |
1049 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1050 | entry->len); | |
1051 | } | |
1052 | ||
1053 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1054 | } | |
1055 | ||
1056 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1057 | struct ntb_queue_entry *entry) | |
1058 | { | |
1059 | struct ntb_payload_header *hdr; | |
1060 | void *offset; | |
1061 | ||
1062 | offset = qp->tx_offset; | |
ef114ed5 | 1063 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1064 | |
1065 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %p, entry len %d flags %x buff %p\n", | |
1066 | qp->tx_pkts, offset, qp->tx_offset, entry->len, entry->flags, | |
1067 | entry->buf); | |
1068 | if (hdr->flags) { | |
1069 | qp->tx_ring_full++; | |
1070 | return -EAGAIN; | |
1071 | } | |
1072 | ||
ef114ed5 | 1073 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1074 | if (qp->tx_handler) |
1075 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1076 | ||
1077 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1078 | &qp->tx_free_q); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | ntb_tx_copy_task(qp, entry, offset); | |
1083 | ||
ef114ed5 JM |
1084 | qp->tx_offset += qp->tx_max_frame; |
1085 | if (qp->tx_offset + qp->tx_max_frame >= qp->tx_mw_end) | |
fce8a7bb JM |
1086 | qp->tx_offset = qp->tx_mw_begin; |
1087 | ||
1088 | qp->tx_pkts++; | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1094 | { | |
1095 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1096 | struct ntb_queue_entry *entry; | |
1097 | int i, rc; | |
1098 | ||
1099 | if (qp->qp_link == NTB_LINK_DOWN) | |
1100 | return; | |
1101 | ||
1102 | qp->qp_link = NTB_LINK_DOWN; | |
1103 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1104 | ||
1105 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
1106 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, | |
1107 | &qp->tx_free_q); | |
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, | |
1176 | &qp->rx_free_q); | |
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, | |
1185 | &qp->tx_free_q); | |
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: | |
1202 | while ((entry = | |
1203 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1204 | kfree(entry); | |
1205 | err1: | |
1206 | while ((entry = | |
1207 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1208 | kfree(entry); | |
1209 | set_bit(free_queue, &nt->qp_bitmap); | |
1210 | err: | |
1211 | return NULL; | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1214 | ||
1215 | /** | |
1216 | * ntb_transport_free_queue - Frees NTB transport queue | |
1217 | * @qp: NTB queue to be freed | |
1218 | * | |
1219 | * Frees NTB transport queue | |
1220 | */ | |
1221 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1222 | { | |
1223 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1224 | struct ntb_queue_entry *entry; | |
1225 | ||
1226 | if (!qp) | |
1227 | return; | |
1228 | ||
1229 | cancel_delayed_work_sync(&qp->link_work); | |
1230 | ||
1231 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1232 | tasklet_disable(&qp->rx_work); | |
1233 | ||
1234 | while ((entry = | |
1235 | ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) | |
1236 | kfree(entry); | |
1237 | ||
1238 | while ((entry = | |
1239 | ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { | |
1240 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); | |
1241 | kfree(entry); | |
1242 | } | |
1243 | ||
1244 | while ((entry = | |
1245 | ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) | |
1246 | kfree(entry); | |
1247 | ||
1248 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1249 | ||
1250 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1251 | } | |
1252 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1253 | ||
1254 | /** | |
1255 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1256 | * @qp: NTB queue to be freed | |
1257 | * @len: pointer to variable to write enqueued buffers length | |
1258 | * | |
1259 | * Dequeues unused buffers from receive queue. Should only be used during | |
1260 | * shutdown of qp. | |
1261 | * | |
1262 | * RETURNS: NULL error value on error, or void* for success. | |
1263 | */ | |
1264 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1265 | { | |
1266 | struct ntb_queue_entry *entry; | |
1267 | void *buf; | |
1268 | ||
1269 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1270 | return NULL; | |
1271 | ||
1272 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1273 | if (!entry) | |
1274 | return NULL; | |
1275 | ||
1276 | buf = entry->cb_data; | |
1277 | *len = entry->len; | |
1278 | ||
1279 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
1280 | &qp->rx_free_q); | |
1281 | ||
1282 | return buf; | |
1283 | } | |
1284 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1285 | ||
1286 | /** | |
1287 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1288 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1289 | * @cb: per buffer pointer for callback function to use | |
1290 | * @data: pointer to data buffer that incoming packets will be copied into | |
1291 | * @len: length of the data buffer | |
1292 | * | |
1293 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1294 | * payload can be received into. | |
1295 | * | |
1296 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1297 | */ | |
1298 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1299 | unsigned int len) | |
1300 | { | |
1301 | struct ntb_queue_entry *entry; | |
1302 | ||
1303 | if (!qp) | |
1304 | return -EINVAL; | |
1305 | ||
1306 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1307 | if (!entry) | |
1308 | return -ENOMEM; | |
1309 | ||
1310 | entry->cb_data = cb; | |
1311 | entry->buf = data; | |
1312 | entry->len = len; | |
1313 | ||
1314 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
1315 | &qp->rx_pend_q); | |
1316 | ||
1317 | return 0; | |
1318 | } | |
1319 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1320 | ||
1321 | /** | |
1322 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1323 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1324 | * @cb: per buffer pointer for callback function to use | |
1325 | * @data: pointer to data buffer that will be sent | |
1326 | * @len: length of the data buffer | |
1327 | * | |
1328 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1329 | * payload will be transmitted. This assumes that a lock is behing held to | |
1330 | * serialize access to the qp. | |
1331 | * | |
1332 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1333 | */ | |
1334 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1335 | unsigned int len) | |
1336 | { | |
1337 | struct ntb_queue_entry *entry; | |
1338 | int rc; | |
1339 | ||
1340 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1341 | return -EINVAL; | |
1342 | ||
1343 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1344 | if (!entry) | |
1345 | return -ENOMEM; | |
1346 | ||
1347 | entry->cb_data = cb; | |
1348 | entry->buf = data; | |
1349 | entry->len = len; | |
1350 | entry->flags = 0; | |
1351 | ||
1352 | rc = ntb_process_tx(qp, entry); | |
1353 | if (rc) | |
1354 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1355 | &qp->tx_free_q); | |
1356 | ||
1357 | return rc; | |
1358 | } | |
1359 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1360 | ||
1361 | /** | |
1362 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1363 | * @qp: NTB transport layer queue to be enabled | |
1364 | * | |
1365 | * Notify NTB transport layer of client readiness to use queue | |
1366 | */ | |
1367 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1368 | { | |
1369 | if (!qp) | |
1370 | return; | |
1371 | ||
1372 | qp->client_ready = NTB_LINK_UP; | |
1373 | ||
1374 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1375 | schedule_delayed_work(&qp->link_work, 0); | |
1376 | } | |
1377 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1378 | ||
1379 | /** | |
1380 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1381 | * @qp: NTB transport layer queue to be disabled | |
1382 | * | |
1383 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1384 | * transport queue specified. It is the client's responsibility to ensure all | |
1385 | * entries on queue are purged or otherwise handled appropraitely. | |
1386 | */ | |
1387 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1388 | { | |
1389 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1390 | int rc, val; | |
1391 | ||
1392 | if (!qp) | |
1393 | return; | |
1394 | ||
1395 | qp->client_ready = NTB_LINK_DOWN; | |
1396 | ||
1397 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1398 | if (rc) { | |
1399 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1400 | return; | |
1401 | } | |
1402 | ||
1403 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1404 | val & ~(1 << qp->qp_num)); | |
1405 | if (rc) | |
1406 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1407 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1408 | ||
1409 | if (qp->qp_link == NTB_LINK_UP) | |
1410 | ntb_send_link_down(qp); | |
1411 | else | |
1412 | cancel_delayed_work_sync(&qp->link_work); | |
1413 | } | |
1414 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1415 | ||
1416 | /** | |
1417 | * ntb_transport_link_query - Query transport link state | |
1418 | * @qp: NTB transport layer queue to be queried | |
1419 | * | |
1420 | * Query connectivity to the remote system of the NTB transport queue | |
1421 | * | |
1422 | * RETURNS: true for link up or false for link down | |
1423 | */ | |
1424 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1425 | { | |
1426 | return qp->qp_link == NTB_LINK_UP; | |
1427 | } | |
1428 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1429 | ||
1430 | /** | |
1431 | * ntb_transport_qp_num - Query the qp number | |
1432 | * @qp: NTB transport layer queue to be queried | |
1433 | * | |
1434 | * Query qp number of the NTB transport queue | |
1435 | * | |
1436 | * RETURNS: a zero based number specifying the qp number | |
1437 | */ | |
1438 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1439 | { | |
1440 | return qp->qp_num; | |
1441 | } | |
1442 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1443 | ||
1444 | /** | |
1445 | * ntb_transport_max_size - Query the max payload size of a qp | |
1446 | * @qp: NTB transport layer queue to be queried | |
1447 | * | |
1448 | * Query the maximum payload size permissible on the given qp | |
1449 | * | |
1450 | * RETURNS: the max payload size of a qp | |
1451 | */ | |
ef114ed5 | 1452 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1453 | { |
ef114ed5 | 1454 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1455 | } |
1456 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |