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> | |
282a2fee | 50 | #include <linux/dmaengine.h> |
fce8a7bb JM |
51 | #include <linux/dma-mapping.h> |
52 | #include <linux/errno.h> | |
53 | #include <linux/export.h> | |
54 | #include <linux/interrupt.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/pci.h> | |
57 | #include <linux/slab.h> | |
58 | #include <linux/types.h> | |
59 | #include <linux/ntb.h> | |
60 | #include "ntb_hw.h" | |
61 | ||
113fc505 | 62 | #define NTB_TRANSPORT_VERSION 3 |
fce8a7bb | 63 | |
ef114ed5 | 64 | static unsigned int transport_mtu = 0x401E; |
fce8a7bb JM |
65 | module_param(transport_mtu, uint, 0644); |
66 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
67 | ||
948d3a65 | 68 | static unsigned char max_num_clients; |
fce8a7bb JM |
69 | module_param(max_num_clients, byte, 0644); |
70 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
71 | ||
282a2fee JM |
72 | static unsigned int copy_bytes = 1024; |
73 | module_param(copy_bytes, uint, 0644); | |
74 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
75 | ||
fce8a7bb JM |
76 | struct ntb_queue_entry { |
77 | /* ntb_queue list reference */ | |
78 | struct list_head entry; | |
79 | /* pointers to data to be transfered */ | |
80 | void *cb_data; | |
81 | void *buf; | |
82 | unsigned int len; | |
83 | unsigned int flags; | |
282a2fee JM |
84 | |
85 | struct ntb_transport_qp *qp; | |
86 | union { | |
87 | struct ntb_payload_header __iomem *tx_hdr; | |
88 | struct ntb_payload_header *rx_hdr; | |
89 | }; | |
90 | unsigned int index; | |
fce8a7bb JM |
91 | }; |
92 | ||
793c20e9 JM |
93 | struct ntb_rx_info { |
94 | unsigned int entry; | |
95 | }; | |
96 | ||
fce8a7bb JM |
97 | struct ntb_transport_qp { |
98 | struct ntb_transport *transport; | |
99 | struct ntb_device *ndev; | |
100 | void *cb_data; | |
282a2fee | 101 | struct dma_chan *dma_chan; |
fce8a7bb JM |
102 | |
103 | bool client_ready; | |
104 | bool qp_link; | |
105 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ | |
106 | ||
74465645 | 107 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
108 | struct ntb_rx_info *remote_rx_info; |
109 | ||
fce8a7bb JM |
110 | void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, |
111 | void *data, int len); | |
112 | struct list_head tx_free_q; | |
113 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 114 | void __iomem *tx_mw; |
282a2fee | 115 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
116 | unsigned int tx_index; |
117 | unsigned int tx_max_entry; | |
ef114ed5 | 118 | unsigned int tx_max_frame; |
fce8a7bb JM |
119 | |
120 | void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
121 | void *data, int len); | |
fce8a7bb JM |
122 | struct list_head rx_pend_q; |
123 | struct list_head rx_free_q; | |
124 | spinlock_t ntb_rx_pend_q_lock; | |
125 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
126 | void *rx_buff; |
127 | unsigned int rx_index; | |
128 | unsigned int rx_max_entry; | |
ef114ed5 | 129 | unsigned int rx_max_frame; |
282a2fee | 130 | dma_cookie_t last_cookie; |
fce8a7bb JM |
131 | |
132 | void (*event_handler) (void *data, int status); | |
133 | struct delayed_work link_work; | |
7b4f2d3c | 134 | struct work_struct link_cleanup; |
fce8a7bb JM |
135 | |
136 | struct dentry *debugfs_dir; | |
137 | struct dentry *debugfs_stats; | |
138 | ||
139 | /* Stats */ | |
140 | u64 rx_bytes; | |
141 | u64 rx_pkts; | |
142 | u64 rx_ring_empty; | |
143 | u64 rx_err_no_buf; | |
144 | u64 rx_err_oflow; | |
145 | u64 rx_err_ver; | |
282a2fee JM |
146 | u64 rx_memcpy; |
147 | u64 rx_async; | |
fce8a7bb JM |
148 | u64 tx_bytes; |
149 | u64 tx_pkts; | |
150 | u64 tx_ring_full; | |
282a2fee JM |
151 | u64 tx_err_no_buf; |
152 | u64 tx_memcpy; | |
153 | u64 tx_async; | |
fce8a7bb JM |
154 | }; |
155 | ||
156 | struct ntb_transport_mw { | |
157 | size_t size; | |
158 | void *virt_addr; | |
159 | dma_addr_t dma_addr; | |
160 | }; | |
161 | ||
162 | struct ntb_transport_client_dev { | |
163 | struct list_head entry; | |
164 | struct device dev; | |
165 | }; | |
166 | ||
167 | struct ntb_transport { | |
168 | struct list_head entry; | |
169 | struct list_head client_devs; | |
170 | ||
171 | struct ntb_device *ndev; | |
948d3a65 | 172 | struct ntb_transport_mw *mw; |
fce8a7bb JM |
173 | struct ntb_transport_qp *qps; |
174 | unsigned int max_qps; | |
175 | unsigned long qp_bitmap; | |
176 | bool transport_link; | |
177 | struct delayed_work link_work; | |
7b4f2d3c | 178 | struct work_struct link_cleanup; |
fce8a7bb JM |
179 | }; |
180 | ||
181 | enum { | |
182 | DESC_DONE_FLAG = 1 << 0, | |
183 | LINK_DOWN_FLAG = 1 << 1, | |
184 | }; | |
185 | ||
186 | struct ntb_payload_header { | |
74465645 | 187 | unsigned int ver; |
fce8a7bb JM |
188 | unsigned int len; |
189 | unsigned int flags; | |
190 | }; | |
191 | ||
192 | enum { | |
193 | VERSION = 0, | |
fce8a7bb | 194 | QP_LINKS, |
113fc505 JM |
195 | NUM_QPS, |
196 | NUM_MWS, | |
197 | MW0_SZ_HIGH, | |
198 | MW0_SZ_LOW, | |
199 | MW1_SZ_HIGH, | |
200 | MW1_SZ_LOW, | |
fce8a7bb JM |
201 | MAX_SPAD, |
202 | }; | |
203 | ||
948d3a65 | 204 | #define QP_TO_MW(ndev, qp) ((qp) % ntb_max_mw(ndev)) |
fce8a7bb JM |
205 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
206 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
207 | ||
208 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
209 | { | |
210 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
211 | } | |
212 | ||
213 | static int ntb_client_probe(struct device *dev) | |
214 | { | |
215 | const struct ntb_client *drv = container_of(dev->driver, | |
216 | struct ntb_client, driver); | |
217 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
218 | int rc = -EINVAL; | |
219 | ||
220 | get_device(dev); | |
221 | if (drv && drv->probe) | |
222 | rc = drv->probe(pdev); | |
223 | if (rc) | |
224 | put_device(dev); | |
225 | ||
226 | return rc; | |
227 | } | |
228 | ||
229 | static int ntb_client_remove(struct device *dev) | |
230 | { | |
231 | const struct ntb_client *drv = container_of(dev->driver, | |
232 | struct ntb_client, driver); | |
233 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
234 | ||
235 | if (drv && drv->remove) | |
236 | drv->remove(pdev); | |
237 | ||
238 | put_device(dev); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
170d35a5 | 243 | static struct bus_type ntb_bus_type = { |
fce8a7bb JM |
244 | .name = "ntb_bus", |
245 | .match = ntb_match_bus, | |
246 | .probe = ntb_client_probe, | |
247 | .remove = ntb_client_remove, | |
248 | }; | |
249 | ||
250 | static LIST_HEAD(ntb_transport_list); | |
251 | ||
78a61ab7 | 252 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
253 | { |
254 | if (list_empty(&ntb_transport_list)) { | |
255 | int rc = bus_register(&ntb_bus_type); | |
256 | if (rc) | |
257 | return rc; | |
258 | } | |
259 | ||
260 | list_add(&nt->entry, &ntb_transport_list); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
78a61ab7 | 265 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
266 | { |
267 | struct ntb_transport_client_dev *client_dev, *cd; | |
268 | ||
269 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
270 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
271 | dev_name(&client_dev->dev)); | |
272 | list_del(&client_dev->entry); | |
273 | device_unregister(&client_dev->dev); | |
274 | } | |
275 | ||
276 | list_del(&nt->entry); | |
277 | ||
278 | if (list_empty(&ntb_transport_list)) | |
279 | bus_unregister(&ntb_bus_type); | |
280 | } | |
281 | ||
282 | static void ntb_client_release(struct device *dev) | |
283 | { | |
284 | struct ntb_transport_client_dev *client_dev; | |
285 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
286 | ||
287 | kfree(client_dev); | |
288 | } | |
289 | ||
290 | /** | |
291 | * ntb_unregister_client_dev - Unregister NTB client device | |
292 | * @device_name: Name of NTB client device | |
293 | * | |
294 | * Unregister an NTB client device with the NTB transport layer | |
295 | */ | |
296 | void ntb_unregister_client_dev(char *device_name) | |
297 | { | |
298 | struct ntb_transport_client_dev *client, *cd; | |
299 | struct ntb_transport *nt; | |
300 | ||
301 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
302 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
303 | if (!strncmp(dev_name(&client->dev), device_name, | |
304 | strlen(device_name))) { | |
305 | list_del(&client->entry); | |
306 | device_unregister(&client->dev); | |
307 | } | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
310 | ||
311 | /** | |
312 | * ntb_register_client_dev - Register NTB client device | |
313 | * @device_name: Name of NTB client device | |
314 | * | |
315 | * Register an NTB client device with the NTB transport layer | |
316 | */ | |
317 | int ntb_register_client_dev(char *device_name) | |
318 | { | |
319 | struct ntb_transport_client_dev *client_dev; | |
320 | struct ntb_transport *nt; | |
8b19d450 | 321 | int rc, i = 0; |
fce8a7bb | 322 | |
8222b402 JM |
323 | if (list_empty(&ntb_transport_list)) |
324 | return -ENODEV; | |
325 | ||
fce8a7bb JM |
326 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
327 | struct device *dev; | |
328 | ||
329 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
330 | GFP_KERNEL); | |
331 | if (!client_dev) { | |
332 | rc = -ENOMEM; | |
333 | goto err; | |
334 | } | |
335 | ||
336 | dev = &client_dev->dev; | |
337 | ||
338 | /* setup and register client devices */ | |
8b19d450 | 339 | dev_set_name(dev, "%s%d", device_name, i); |
fce8a7bb JM |
340 | dev->bus = &ntb_bus_type; |
341 | dev->release = ntb_client_release; | |
342 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
343 | ||
344 | rc = device_register(dev); | |
345 | if (rc) { | |
346 | kfree(client_dev); | |
347 | goto err; | |
348 | } | |
349 | ||
350 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 351 | i++; |
fce8a7bb JM |
352 | } |
353 | ||
354 | return 0; | |
355 | ||
356 | err: | |
357 | ntb_unregister_client_dev(device_name); | |
358 | ||
359 | return rc; | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
362 | ||
363 | /** | |
364 | * ntb_register_client - Register NTB client driver | |
365 | * @drv: NTB client driver to be registered | |
366 | * | |
367 | * Register an NTB client driver with the NTB transport layer | |
368 | * | |
369 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
370 | */ | |
371 | int ntb_register_client(struct ntb_client *drv) | |
372 | { | |
373 | drv->driver.bus = &ntb_bus_type; | |
374 | ||
8222b402 JM |
375 | if (list_empty(&ntb_transport_list)) |
376 | return -ENODEV; | |
377 | ||
fce8a7bb JM |
378 | return driver_register(&drv->driver); |
379 | } | |
380 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
381 | ||
382 | /** | |
383 | * ntb_unregister_client - Unregister NTB client driver | |
384 | * @drv: NTB client driver to be unregistered | |
385 | * | |
386 | * Unregister an NTB client driver with the NTB transport layer | |
387 | * | |
388 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
389 | */ | |
390 | void ntb_unregister_client(struct ntb_client *drv) | |
391 | { | |
392 | driver_unregister(&drv->driver); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
395 | ||
fce8a7bb JM |
396 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
397 | loff_t *offp) | |
398 | { | |
399 | struct ntb_transport_qp *qp; | |
d7237e22 | 400 | char *buf; |
fce8a7bb JM |
401 | ssize_t ret, out_offset, out_count; |
402 | ||
282a2fee | 403 | out_count = 1000; |
d7237e22 JM |
404 | |
405 | buf = kmalloc(out_count, GFP_KERNEL); | |
406 | if (!buf) | |
407 | return -ENOMEM; | |
fce8a7bb JM |
408 | |
409 | qp = filp->private_data; | |
410 | out_offset = 0; | |
411 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
412 | "NTB QP stats\n"); | |
413 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
414 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
415 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
416 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
417 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
418 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
419 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
420 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
421 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
422 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
423 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
424 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
425 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
426 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
427 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
428 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
429 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 430 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 431 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 432 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 433 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 434 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
435 | |
436 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
437 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
438 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
439 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
440 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
441 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
442 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
443 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
444 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
445 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
446 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
447 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 448 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 449 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 450 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 451 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 452 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 453 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
454 | |
455 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d7237e22 | 456 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 457 | "Up" : "Down"); |
d7237e22 JM |
458 | if (out_offset > out_count) |
459 | out_offset = out_count; | |
fce8a7bb JM |
460 | |
461 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 462 | kfree(buf); |
fce8a7bb JM |
463 | return ret; |
464 | } | |
465 | ||
466 | static const struct file_operations ntb_qp_debugfs_stats = { | |
467 | .owner = THIS_MODULE, | |
d66d7ac2 | 468 | .open = simple_open, |
fce8a7bb JM |
469 | .read = debugfs_read, |
470 | }; | |
471 | ||
472 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
473 | struct list_head *list) | |
474 | { | |
475 | unsigned long flags; | |
476 | ||
477 | spin_lock_irqsave(lock, flags); | |
478 | list_add_tail(entry, list); | |
479 | spin_unlock_irqrestore(lock, flags); | |
480 | } | |
481 | ||
482 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
483 | struct list_head *list) | |
484 | { | |
485 | struct ntb_queue_entry *entry; | |
486 | unsigned long flags; | |
487 | ||
488 | spin_lock_irqsave(lock, flags); | |
489 | if (list_empty(list)) { | |
490 | entry = NULL; | |
491 | goto out; | |
492 | } | |
493 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
494 | list_del(&entry->entry); | |
495 | out: | |
496 | spin_unlock_irqrestore(lock, flags); | |
497 | ||
498 | return entry; | |
499 | } | |
500 | ||
501 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
502 | unsigned int qp_num) | |
503 | { | |
504 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 505 | unsigned int rx_size, num_qps_mw; |
948d3a65 | 506 | u8 mw_num, mw_max; |
793c20e9 | 507 | unsigned int i; |
fce8a7bb | 508 | |
948d3a65 JM |
509 | mw_max = ntb_max_mw(nt->ndev); |
510 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
511 | ||
74465645 | 512 | WARN_ON(nt->mw[mw_num].virt_addr == NULL); |
fce8a7bb | 513 | |
948d3a65 JM |
514 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
515 | num_qps_mw = nt->max_qps / mw_max + 1; | |
fce8a7bb | 516 | else |
948d3a65 | 517 | num_qps_mw = nt->max_qps / mw_max; |
fce8a7bb | 518 | |
793c20e9 | 519 | rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; |
282a2fee | 520 | qp->rx_buff = nt->mw[mw_num].virt_addr + qp_num / mw_max * rx_size; |
793c20e9 JM |
521 | rx_size -= sizeof(struct ntb_rx_info); |
522 | ||
282a2fee JM |
523 | qp->remote_rx_info = qp->rx_buff + rx_size; |
524 | ||
c9d534c8 JM |
525 | /* Due to housekeeping, there must be atleast 2 buffs */ |
526 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
527 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
528 | qp->rx_index = 0; | |
529 | ||
c9d534c8 | 530 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 531 | |
ef114ed5 | 532 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
533 | for (i = 0; i < qp->rx_max_entry; i++) { |
534 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
535 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 536 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 537 | } |
fce8a7bb JM |
538 | |
539 | qp->rx_pkts = 0; | |
540 | qp->tx_pkts = 0; | |
90f9e934 | 541 | qp->tx_index = 0; |
fce8a7bb JM |
542 | } |
543 | ||
b77b2637 JM |
544 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
545 | { | |
546 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
547 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
548 | ||
549 | if (!mw->virt_addr) | |
550 | return; | |
551 | ||
552 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
553 | mw->virt_addr = NULL; | |
554 | } | |
555 | ||
fce8a7bb JM |
556 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) |
557 | { | |
558 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
559 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb | 560 | |
b77b2637 JM |
561 | /* No need to re-setup */ |
562 | if (mw->size == ALIGN(size, 4096)) | |
563 | return 0; | |
564 | ||
565 | if (mw->size != 0) | |
566 | ntb_free_mw(nt, num_mw); | |
567 | ||
fce8a7bb JM |
568 | /* Alloc memory for receiving data. Must be 4k aligned */ |
569 | mw->size = ALIGN(size, 4096); | |
570 | ||
571 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
572 | GFP_KERNEL); | |
573 | if (!mw->virt_addr) { | |
b77b2637 | 574 | mw->size = 0; |
fce8a7bb JM |
575 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", |
576 | (int) mw->size); | |
577 | return -ENOMEM; | |
578 | } | |
579 | ||
fce8a7bb JM |
580 | /* Notify HW the memory location of the receive buffer */ |
581 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
fca4d518 | 586 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb JM |
587 | { |
588 | struct ntb_transport *nt = qp->transport; | |
589 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
590 | ||
591 | if (qp->qp_link == NTB_LINK_DOWN) { | |
592 | cancel_delayed_work_sync(&qp->link_work); | |
593 | return; | |
594 | } | |
595 | ||
596 | if (qp->event_handler) | |
597 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
598 | ||
599 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
600 | qp->qp_link = NTB_LINK_DOWN; | |
fca4d518 JM |
601 | } |
602 | ||
603 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
604 | { | |
605 | struct ntb_transport_qp *qp = container_of(work, | |
606 | struct ntb_transport_qp, | |
607 | link_cleanup); | |
608 | struct ntb_transport *nt = qp->transport; | |
609 | ||
610 | ntb_qp_link_cleanup(qp); | |
fce8a7bb JM |
611 | |
612 | if (nt->transport_link == NTB_LINK_UP) | |
613 | schedule_delayed_work(&qp->link_work, | |
614 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
615 | } | |
616 | ||
7b4f2d3c JM |
617 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
618 | { | |
619 | schedule_work(&qp->link_cleanup); | |
620 | } | |
621 | ||
fca4d518 | 622 | static void ntb_transport_link_cleanup(struct ntb_transport *nt) |
fce8a7bb JM |
623 | { |
624 | int i; | |
625 | ||
fca4d518 JM |
626 | /* Pass along the info to any clients */ |
627 | for (i = 0; i < nt->max_qps; i++) | |
628 | if (!test_bit(i, &nt->qp_bitmap)) | |
629 | ntb_qp_link_cleanup(&nt->qps[i]); | |
630 | ||
fce8a7bb JM |
631 | if (nt->transport_link == NTB_LINK_DOWN) |
632 | cancel_delayed_work_sync(&nt->link_work); | |
633 | else | |
634 | nt->transport_link = NTB_LINK_DOWN; | |
635 | ||
fce8a7bb JM |
636 | /* The scratchpad registers keep the values if the remote side |
637 | * goes down, blast them now to give them a sane value the next | |
638 | * time they are accessed | |
639 | */ | |
640 | for (i = 0; i < MAX_SPAD; i++) | |
641 | ntb_write_local_spad(nt->ndev, i, 0); | |
642 | } | |
643 | ||
fca4d518 JM |
644 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
645 | { | |
646 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
647 | link_cleanup); | |
648 | ||
649 | ntb_transport_link_cleanup(nt); | |
650 | } | |
651 | ||
fce8a7bb JM |
652 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) |
653 | { | |
654 | struct ntb_transport *nt = data; | |
655 | ||
656 | switch (event) { | |
657 | case NTB_EVENT_HW_LINK_UP: | |
658 | schedule_delayed_work(&nt->link_work, 0); | |
659 | break; | |
660 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 661 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
662 | break; |
663 | default: | |
664 | BUG(); | |
665 | } | |
666 | } | |
667 | ||
668 | static void ntb_transport_link_work(struct work_struct *work) | |
669 | { | |
670 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
671 | link_work.work); | |
672 | struct ntb_device *ndev = nt->ndev; | |
673 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
674 | u32 val; | |
675 | int rc, i; | |
676 | ||
113fc505 | 677 | /* send the local info, in the opposite order of the way we read it */ |
948d3a65 | 678 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 JM |
679 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), |
680 | ntb_get_mw_size(ndev, i) >> 32); | |
681 | if (rc) { | |
682 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
683 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
684 | MW0_SZ_HIGH + (i * 2)); | |
685 | goto out; | |
686 | } | |
fce8a7bb | 687 | |
113fc505 JM |
688 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
689 | (u32) ntb_get_mw_size(ndev, i)); | |
690 | if (rc) { | |
691 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
692 | (u32) ntb_get_mw_size(ndev, i), | |
693 | MW0_SZ_LOW + (i * 2)); | |
694 | goto out; | |
695 | } | |
fce8a7bb JM |
696 | } |
697 | ||
948d3a65 | 698 | rc = ntb_write_remote_spad(ndev, NUM_MWS, ntb_max_mw(ndev)); |
fce8a7bb JM |
699 | if (rc) { |
700 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
948d3a65 | 701 | ntb_max_mw(ndev), NUM_MWS); |
fce8a7bb JM |
702 | goto out; |
703 | } | |
704 | ||
705 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
706 | if (rc) { | |
707 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
708 | nt->max_qps, NUM_QPS); | |
709 | goto out; | |
710 | } | |
711 | ||
113fc505 | 712 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
713 | if (rc) { |
714 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 715 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
716 | goto out; |
717 | } | |
718 | ||
719 | /* Query the remote side for its info */ | |
720 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
721 | if (rc) { | |
722 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
723 | goto out; | |
724 | } | |
725 | ||
726 | if (val != NTB_TRANSPORT_VERSION) | |
727 | goto out; | |
728 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
729 | ||
730 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
731 | if (rc) { | |
732 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
733 | goto out; | |
734 | } | |
735 | ||
736 | if (val != nt->max_qps) | |
737 | goto out; | |
738 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
739 | ||
113fc505 | 740 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 741 | if (rc) { |
113fc505 | 742 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
743 | goto out; |
744 | } | |
745 | ||
948d3a65 | 746 | if (val != ntb_max_mw(ndev)) |
fce8a7bb | 747 | goto out; |
113fc505 | 748 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 749 | |
948d3a65 | 750 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 | 751 | u64 val64; |
fce8a7bb | 752 | |
113fc505 JM |
753 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
754 | if (rc) { | |
755 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
756 | MW0_SZ_HIGH + (i * 2)); | |
757 | goto out1; | |
758 | } | |
fce8a7bb | 759 | |
113fc505 | 760 | val64 = (u64) val << 32; |
fce8a7bb | 761 | |
113fc505 JM |
762 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
763 | if (rc) { | |
764 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
765 | MW0_SZ_LOW + (i * 2)); | |
766 | goto out1; | |
767 | } | |
768 | ||
769 | val64 |= val; | |
770 | ||
771 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
772 | ||
773 | rc = ntb_set_mw(nt, i, val64); | |
774 | if (rc) | |
775 | goto out1; | |
776 | } | |
fce8a7bb JM |
777 | |
778 | nt->transport_link = NTB_LINK_UP; | |
779 | ||
780 | for (i = 0; i < nt->max_qps; i++) { | |
781 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
782 | ||
783 | ntb_transport_setup_qp_mw(nt, i); | |
784 | ||
785 | if (qp->client_ready == NTB_LINK_UP) | |
786 | schedule_delayed_work(&qp->link_work, 0); | |
787 | } | |
788 | ||
789 | return; | |
790 | ||
113fc505 | 791 | out1: |
948d3a65 | 792 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 793 | ntb_free_mw(nt, i); |
fce8a7bb JM |
794 | out: |
795 | if (ntb_hw_link_status(ndev)) | |
796 | schedule_delayed_work(&nt->link_work, | |
797 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
798 | } | |
799 | ||
800 | static void ntb_qp_link_work(struct work_struct *work) | |
801 | { | |
802 | struct ntb_transport_qp *qp = container_of(work, | |
803 | struct ntb_transport_qp, | |
804 | link_work.work); | |
805 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
806 | struct ntb_transport *nt = qp->transport; | |
807 | int rc, val; | |
808 | ||
809 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
810 | ||
811 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
812 | if (rc) { | |
813 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
814 | return; | |
815 | } | |
816 | ||
817 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
818 | if (rc) | |
819 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
820 | val | 1 << qp->qp_num, QP_LINKS); | |
821 | ||
822 | /* query remote spad for qp ready bits */ | |
823 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
824 | if (rc) | |
825 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
826 | ||
827 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
828 | ||
829 | /* See if the remote side is up */ | |
830 | if (1 << qp->qp_num & val) { | |
831 | qp->qp_link = NTB_LINK_UP; | |
832 | ||
833 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
834 | if (qp->event_handler) | |
835 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
836 | } else if (nt->transport_link == NTB_LINK_UP) | |
837 | schedule_delayed_work(&qp->link_work, | |
838 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
839 | } | |
840 | ||
282a2fee | 841 | static int ntb_transport_init_queue(struct ntb_transport *nt, |
fce8a7bb JM |
842 | unsigned int qp_num) |
843 | { | |
844 | struct ntb_transport_qp *qp; | |
ef114ed5 | 845 | unsigned int num_qps_mw, tx_size; |
948d3a65 | 846 | u8 mw_num, mw_max; |
282a2fee | 847 | u64 qp_offset; |
948d3a65 JM |
848 | |
849 | mw_max = ntb_max_mw(nt->ndev); | |
850 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
fce8a7bb JM |
851 | |
852 | qp = &nt->qps[qp_num]; | |
853 | qp->qp_num = qp_num; | |
854 | qp->transport = nt; | |
855 | qp->ndev = nt->ndev; | |
856 | qp->qp_link = NTB_LINK_DOWN; | |
857 | qp->client_ready = NTB_LINK_DOWN; | |
858 | qp->event_handler = NULL; | |
859 | ||
948d3a65 JM |
860 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
861 | num_qps_mw = nt->max_qps / mw_max + 1; | |
ef114ed5 | 862 | else |
948d3a65 | 863 | num_qps_mw = nt->max_qps / mw_max; |
ef114ed5 | 864 | |
793c20e9 | 865 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
282a2fee JM |
866 | qp_offset = qp_num / mw_max * tx_size; |
867 | qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset; | |
868 | if (!qp->tx_mw) | |
869 | return -EINVAL; | |
870 | ||
871 | qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset; | |
872 | if (!qp->tx_mw_phys) | |
873 | return -EINVAL; | |
874 | ||
793c20e9 | 875 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 876 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 877 | |
c9d534c8 JM |
878 | /* Due to housekeeping, there must be atleast 2 buffs */ |
879 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 880 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 881 | |
1517a3f2 | 882 | if (ntb_query_debugfs(nt->ndev)) { |
fce8a7bb JM |
883 | char debugfs_name[4]; |
884 | ||
885 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
886 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
1517a3f2 | 887 | ntb_query_debugfs(nt->ndev)); |
fce8a7bb JM |
888 | |
889 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
890 | qp->debugfs_dir, qp, | |
891 | &ntb_qp_debugfs_stats); | |
892 | } | |
893 | ||
894 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 895 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
896 | |
897 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
898 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
899 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
900 | ||
901 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
902 | INIT_LIST_HEAD(&qp->rx_free_q); | |
903 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee JM |
904 | |
905 | return 0; | |
fce8a7bb JM |
906 | } |
907 | ||
908 | int ntb_transport_init(struct pci_dev *pdev) | |
909 | { | |
910 | struct ntb_transport *nt; | |
911 | int rc, i; | |
912 | ||
913 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
914 | if (!nt) | |
915 | return -ENOMEM; | |
916 | ||
fce8a7bb JM |
917 | nt->ndev = ntb_register_transport(pdev, nt); |
918 | if (!nt->ndev) { | |
919 | rc = -EIO; | |
920 | goto err; | |
921 | } | |
922 | ||
948d3a65 JM |
923 | nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw), |
924 | GFP_KERNEL); | |
925 | if (!nt->mw) { | |
926 | rc = -ENOMEM; | |
927 | goto err1; | |
928 | } | |
929 | ||
930 | if (max_num_clients) | |
931 | nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients); | |
932 | else | |
933 | nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev)); | |
fce8a7bb JM |
934 | |
935 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
936 | GFP_KERNEL); | |
937 | if (!nt->qps) { | |
938 | rc = -ENOMEM; | |
948d3a65 | 939 | goto err2; |
fce8a7bb JM |
940 | } |
941 | ||
942 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
943 | ||
282a2fee JM |
944 | for (i = 0; i < nt->max_qps; i++) { |
945 | rc = ntb_transport_init_queue(nt, i); | |
946 | if (rc) | |
947 | goto err3; | |
948 | } | |
fce8a7bb JM |
949 | |
950 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 951 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb JM |
952 | |
953 | rc = ntb_register_event_callback(nt->ndev, | |
954 | ntb_transport_event_callback); | |
955 | if (rc) | |
948d3a65 | 956 | goto err3; |
fce8a7bb JM |
957 | |
958 | INIT_LIST_HEAD(&nt->client_devs); | |
959 | rc = ntb_bus_init(nt); | |
960 | if (rc) | |
948d3a65 | 961 | goto err4; |
fce8a7bb JM |
962 | |
963 | if (ntb_hw_link_status(nt->ndev)) | |
964 | schedule_delayed_work(&nt->link_work, 0); | |
965 | ||
966 | return 0; | |
967 | ||
948d3a65 | 968 | err4: |
fce8a7bb | 969 | ntb_unregister_event_callback(nt->ndev); |
948d3a65 | 970 | err3: |
fce8a7bb | 971 | kfree(nt->qps); |
948d3a65 JM |
972 | err2: |
973 | kfree(nt->mw); | |
fce8a7bb JM |
974 | err1: |
975 | ntb_unregister_transport(nt->ndev); | |
976 | err: | |
fce8a7bb JM |
977 | kfree(nt); |
978 | return rc; | |
979 | } | |
980 | ||
981 | void ntb_transport_free(void *transport) | |
982 | { | |
983 | struct ntb_transport *nt = transport; | |
948d3a65 | 984 | struct ntb_device *ndev = nt->ndev; |
fce8a7bb JM |
985 | int i; |
986 | ||
fca4d518 | 987 | ntb_transport_link_cleanup(nt); |
fce8a7bb JM |
988 | |
989 | /* verify that all the qp's are freed */ | |
1517a3f2 | 990 | for (i = 0; i < nt->max_qps; i++) { |
fce8a7bb JM |
991 | if (!test_bit(i, &nt->qp_bitmap)) |
992 | ntb_transport_free_queue(&nt->qps[i]); | |
1517a3f2 JM |
993 | debugfs_remove_recursive(nt->qps[i].debugfs_dir); |
994 | } | |
fce8a7bb JM |
995 | |
996 | ntb_bus_remove(nt); | |
997 | ||
998 | cancel_delayed_work_sync(&nt->link_work); | |
999 | ||
948d3a65 | 1000 | ntb_unregister_event_callback(ndev); |
fce8a7bb | 1001 | |
948d3a65 | 1002 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 1003 | ntb_free_mw(nt, i); |
fce8a7bb JM |
1004 | |
1005 | kfree(nt->qps); | |
948d3a65 JM |
1006 | kfree(nt->mw); |
1007 | ntb_unregister_transport(ndev); | |
fce8a7bb JM |
1008 | kfree(nt); |
1009 | } | |
1010 | ||
282a2fee | 1011 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1012 | { |
282a2fee JM |
1013 | struct ntb_queue_entry *entry = data; |
1014 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1015 | void *cb_data = entry->cb_data; |
1016 | unsigned int len = entry->len; | |
282a2fee JM |
1017 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1018 | ||
1019 | /* Ensure that the data is fully copied out before clearing the flag */ | |
1020 | wmb(); | |
1021 | hdr->flags = 0; | |
fce8a7bb | 1022 | |
282a2fee | 1023 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1024 | |
1025 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
1026 | |
1027 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
1028 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
1029 | } |
1030 | ||
282a2fee JM |
1031 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1032 | { | |
1033 | void *buf = entry->buf; | |
1034 | size_t len = entry->len; | |
1035 | ||
1036 | memcpy(buf, offset, len); | |
1037 | ||
1038 | ntb_rx_copy_callback(entry); | |
1039 | } | |
1040 | ||
1041 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1042 | size_t len) | |
1043 | { | |
1044 | struct dma_async_tx_descriptor *txd; | |
1045 | struct ntb_transport_qp *qp = entry->qp; | |
1046 | struct dma_chan *chan = qp->dma_chan; | |
1047 | struct dma_device *device; | |
1048 | size_t pay_off, buff_off; | |
6f57fd05 | 1049 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1050 | dma_cookie_t cookie; |
1051 | void *buf = entry->buf; | |
282a2fee JM |
1052 | |
1053 | entry->len = len; | |
1054 | ||
1055 | if (!chan) | |
1056 | goto err; | |
1057 | ||
1058 | if (len < copy_bytes) | |
6f57fd05 | 1059 | goto err_wait; |
282a2fee JM |
1060 | |
1061 | device = chan->device; | |
1062 | pay_off = (size_t) offset & ~PAGE_MASK; | |
1063 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1064 | ||
1065 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1066 | goto err_wait; |
282a2fee | 1067 | |
6f57fd05 BZ |
1068 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1069 | if (!unmap) | |
1070 | goto err_wait; | |
282a2fee | 1071 | |
6f57fd05 BZ |
1072 | unmap->len = len; |
1073 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1074 | pay_off, len, DMA_TO_DEVICE); | |
1075 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1076 | goto err_get_unmap; | |
1077 | ||
1078 | unmap->to_cnt = 1; | |
282a2fee | 1079 | |
6f57fd05 BZ |
1080 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1081 | buff_off, len, DMA_FROM_DEVICE); | |
1082 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1083 | goto err_get_unmap; | |
1084 | ||
1085 | unmap->from_cnt = 1; | |
1086 | ||
6f57fd05 | 1087 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1088 | unmap->addr[0], len, |
1089 | DMA_PREP_INTERRUPT); | |
282a2fee | 1090 | if (!txd) |
6f57fd05 | 1091 | goto err_get_unmap; |
282a2fee JM |
1092 | |
1093 | txd->callback = ntb_rx_copy_callback; | |
1094 | txd->callback_param = entry; | |
6f57fd05 | 1095 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1096 | |
1097 | cookie = dmaengine_submit(txd); | |
1098 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1099 | goto err_set_unmap; |
1100 | ||
1101 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1102 | |
1103 | qp->last_cookie = cookie; | |
1104 | ||
1105 | qp->rx_async++; | |
1106 | ||
1107 | return; | |
1108 | ||
6f57fd05 BZ |
1109 | err_set_unmap: |
1110 | dmaengine_unmap_put(unmap); | |
1111 | err_get_unmap: | |
1112 | dmaengine_unmap_put(unmap); | |
1113 | err_wait: | |
282a2fee JM |
1114 | /* If the callbacks come out of order, the writing of the index to the |
1115 | * last completed will be out of order. This may result in the | |
1116 | * receive stalling forever. | |
1117 | */ | |
1118 | dma_sync_wait(chan, qp->last_cookie); | |
1119 | err: | |
1120 | ntb_memcpy_rx(entry, offset); | |
1121 | qp->rx_memcpy++; | |
1122 | } | |
1123 | ||
fce8a7bb JM |
1124 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1125 | { | |
1126 | struct ntb_payload_header *hdr; | |
1127 | struct ntb_queue_entry *entry; | |
1128 | void *offset; | |
1129 | ||
793c20e9 JM |
1130 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1131 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1132 | ||
fce8a7bb JM |
1133 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1134 | if (!entry) { | |
fce8a7bb | 1135 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1136 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
1137 | hdr->ver, hdr->len, hdr->flags); |
1138 | qp->rx_err_no_buf++; | |
1139 | return -ENOMEM; | |
1140 | } | |
1141 | ||
fce8a7bb JM |
1142 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
1143 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1144 | &qp->rx_pend_q); |
fce8a7bb JM |
1145 | qp->rx_ring_empty++; |
1146 | return -EAGAIN; | |
1147 | } | |
1148 | ||
74465645 | 1149 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 1150 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1151 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
1152 | qp->qp_num, qp->rx_pkts, hdr->ver); |
1153 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1154 | &qp->rx_pend_q); |
fce8a7bb JM |
1155 | qp->rx_err_ver++; |
1156 | return -EIO; | |
1157 | } | |
1158 | ||
1159 | if (hdr->flags & LINK_DOWN_FLAG) { | |
1160 | ntb_qp_link_down(qp); | |
1161 | ||
282a2fee | 1162 | goto err; |
fce8a7bb JM |
1163 | } |
1164 | ||
1165 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1166 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1167 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1168 | |
282a2fee JM |
1169 | qp->rx_bytes += hdr->len; |
1170 | qp->rx_pkts++; | |
fce8a7bb | 1171 | |
282a2fee | 1172 | if (hdr->len > entry->len) { |
fce8a7bb JM |
1173 | qp->rx_err_oflow++; |
1174 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1175 | "RX overflow! Wanted %d got %d\n", | |
1176 | hdr->len, entry->len); | |
282a2fee JM |
1177 | |
1178 | goto err; | |
fce8a7bb JM |
1179 | } |
1180 | ||
282a2fee JM |
1181 | entry->index = qp->rx_index; |
1182 | entry->rx_hdr = hdr; | |
1183 | ||
1184 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb JM |
1185 | |
1186 | out: | |
282a2fee JM |
1187 | qp->rx_index++; |
1188 | qp->rx_index %= qp->rx_max_entry; | |
1189 | ||
1190 | return 0; | |
1191 | ||
1192 | err: | |
1193 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
1194 | &qp->rx_pend_q); | |
793c20e9 JM |
1195 | /* Ensure that the data is fully copied out before clearing the flag */ |
1196 | wmb(); | |
1197 | hdr->flags = 0; | |
74465645 | 1198 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1199 | |
282a2fee | 1200 | goto out; |
fce8a7bb JM |
1201 | } |
1202 | ||
e8aeb60c | 1203 | static int ntb_transport_rxc_db(void *data, int db_num) |
fce8a7bb | 1204 | { |
e8aeb60c | 1205 | struct ntb_transport_qp *qp = data; |
c336acd3 | 1206 | int rc, i; |
fce8a7bb | 1207 | |
e8aeb60c JM |
1208 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", |
1209 | __func__, db_num); | |
1210 | ||
c336acd3 JM |
1211 | /* Limit the number of packets processed in a single interrupt to |
1212 | * provide fairness to others | |
1213 | */ | |
1214 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1215 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1216 | if (rc) |
1217 | break; | |
1218 | } | |
282a2fee JM |
1219 | |
1220 | if (qp->dma_chan) | |
1221 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1222 | |
e8aeb60c | 1223 | return i; |
fce8a7bb JM |
1224 | } |
1225 | ||
282a2fee | 1226 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1227 | { |
282a2fee JM |
1228 | struct ntb_queue_entry *entry = data; |
1229 | struct ntb_transport_qp *qp = entry->qp; | |
1230 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1231 | |
282a2fee | 1232 | /* Ensure that the data is fully copied out before setting the flags */ |
842c1dde | 1233 | wmb(); |
74465645 | 1234 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1235 | |
49793889 | 1236 | ntb_ring_doorbell(qp->ndev, qp->qp_num); |
fce8a7bb JM |
1237 | |
1238 | /* The entry length can only be zero if the packet is intended to be a | |
1239 | * "link down" or similar. Since no payload is being sent in these | |
1240 | * cases, there is nothing to add to the completion queue. | |
1241 | */ | |
1242 | if (entry->len > 0) { | |
1243 | qp->tx_bytes += entry->len; | |
1244 | ||
1245 | if (qp->tx_handler) | |
1246 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1247 | entry->len); | |
1248 | } | |
1249 | ||
1250 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1251 | } | |
1252 | ||
282a2fee | 1253 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1254 | { |
282a2fee JM |
1255 | memcpy_toio(offset, entry->buf, entry->len); |
1256 | ||
1257 | ntb_tx_copy_callback(entry); | |
1258 | } | |
1259 | ||
1260 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1261 | struct ntb_queue_entry *entry) | |
1262 | { | |
1263 | struct ntb_payload_header __iomem *hdr; | |
1264 | struct dma_async_tx_descriptor *txd; | |
1265 | struct dma_chan *chan = qp->dma_chan; | |
1266 | struct dma_device *device; | |
1267 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1268 | struct dmaengine_unmap_data *unmap; |
1269 | dma_addr_t dest; | |
282a2fee | 1270 | dma_cookie_t cookie; |
74465645 | 1271 | void __iomem *offset; |
282a2fee JM |
1272 | size_t len = entry->len; |
1273 | void *buf = entry->buf; | |
fce8a7bb | 1274 | |
793c20e9 | 1275 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1276 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1277 | entry->tx_hdr = hdr; | |
fce8a7bb | 1278 | |
282a2fee JM |
1279 | iowrite32(entry->len, &hdr->len); |
1280 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
1281 | ||
1282 | if (!chan) | |
1283 | goto err; | |
1284 | ||
1285 | if (len < copy_bytes) | |
1286 | goto err; | |
1287 | ||
1288 | device = chan->device; | |
1289 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
1290 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1291 | dest_off = (size_t) dest & ~PAGE_MASK; | |
1292 | ||
1293 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1294 | goto err; | |
1295 | ||
6f57fd05 BZ |
1296 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1297 | if (!unmap) | |
282a2fee JM |
1298 | goto err; |
1299 | ||
6f57fd05 BZ |
1300 | unmap->len = len; |
1301 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1302 | buff_off, len, DMA_TO_DEVICE); | |
1303 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1304 | goto err_get_unmap; | |
1305 | ||
1306 | unmap->to_cnt = 1; | |
1307 | ||
6f57fd05 | 1308 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1309 | DMA_PREP_INTERRUPT); |
282a2fee | 1310 | if (!txd) |
6f57fd05 | 1311 | goto err_get_unmap; |
282a2fee JM |
1312 | |
1313 | txd->callback = ntb_tx_copy_callback; | |
1314 | txd->callback_param = entry; | |
6f57fd05 | 1315 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1316 | |
1317 | cookie = dmaengine_submit(txd); | |
1318 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1319 | goto err_set_unmap; |
1320 | ||
1321 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1322 | |
1323 | dma_async_issue_pending(chan); | |
1324 | qp->tx_async++; | |
1325 | ||
1326 | return; | |
6f57fd05 BZ |
1327 | err_set_unmap: |
1328 | dmaengine_unmap_put(unmap); | |
1329 | err_get_unmap: | |
1330 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1331 | err: |
1332 | ntb_memcpy_tx(entry, offset); | |
1333 | qp->tx_memcpy++; | |
1334 | } | |
1335 | ||
1336 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1337 | struct ntb_queue_entry *entry) | |
1338 | { | |
1339 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - tx %u, entry len %d flags %x buff %p\n", | |
1340 | qp->tx_pkts, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1341 | entry->buf); |
793c20e9 | 1342 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1343 | qp->tx_ring_full++; |
1344 | return -EAGAIN; | |
1345 | } | |
1346 | ||
ef114ed5 | 1347 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1348 | if (qp->tx_handler) |
1349 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1350 | ||
1351 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1352 | &qp->tx_free_q); | |
1353 | return 0; | |
1354 | } | |
1355 | ||
282a2fee | 1356 | ntb_async_tx(qp, entry); |
fce8a7bb | 1357 | |
793c20e9 JM |
1358 | qp->tx_index++; |
1359 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1360 | |
1361 | qp->tx_pkts++; | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1367 | { | |
1368 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1369 | struct ntb_queue_entry *entry; | |
1370 | int i, rc; | |
1371 | ||
1372 | if (qp->qp_link == NTB_LINK_DOWN) | |
1373 | return; | |
1374 | ||
1375 | qp->qp_link = NTB_LINK_DOWN; | |
1376 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1377 | ||
1378 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1379 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1380 | if (entry) |
1381 | break; | |
1382 | msleep(100); | |
1383 | } | |
1384 | ||
1385 | if (!entry) | |
1386 | return; | |
1387 | ||
1388 | entry->cb_data = NULL; | |
1389 | entry->buf = NULL; | |
1390 | entry->len = 0; | |
1391 | entry->flags = LINK_DOWN_FLAG; | |
1392 | ||
1393 | rc = ntb_process_tx(qp, entry); | |
1394 | if (rc) | |
1395 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1396 | qp->qp_num); | |
1397 | } | |
1398 | ||
1399 | /** | |
1400 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1401 | * @rx_handler: receive callback function | |
1402 | * @tx_handler: transmit callback function | |
1403 | * @event_handler: event callback function | |
1404 | * | |
1405 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1406 | * routine for both transmit and receive. The receive callback routine will be | |
1407 | * used to pass up data when the transport has received it on the queue. The | |
1408 | * transmit callback routine will be called when the transport has completed the | |
1409 | * transmission of the data on the queue and the data is ready to be freed. | |
1410 | * | |
1411 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1412 | */ | |
1413 | struct ntb_transport_qp * | |
1414 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1415 | const struct ntb_queue_handlers *handlers) | |
1416 | { | |
1417 | struct ntb_queue_entry *entry; | |
1418 | struct ntb_transport_qp *qp; | |
1419 | struct ntb_transport *nt; | |
1420 | unsigned int free_queue; | |
1421 | int rc, i; | |
1422 | ||
1423 | nt = ntb_find_transport(pdev); | |
1424 | if (!nt) | |
1425 | goto err; | |
1426 | ||
1427 | free_queue = ffs(nt->qp_bitmap); | |
1428 | if (!free_queue) | |
1429 | goto err; | |
1430 | ||
1431 | /* decrement free_queue to make it zero based */ | |
1432 | free_queue--; | |
1433 | ||
1434 | clear_bit(free_queue, &nt->qp_bitmap); | |
1435 | ||
1436 | qp = &nt->qps[free_queue]; | |
1437 | qp->cb_data = data; | |
1438 | qp->rx_handler = handlers->rx_handler; | |
1439 | qp->tx_handler = handlers->tx_handler; | |
1440 | qp->event_handler = handlers->event_handler; | |
1441 | ||
94681194 | 1442 | dmaengine_get(); |
282a2fee | 1443 | qp->dma_chan = dma_find_channel(DMA_MEMCPY); |
94681194 JM |
1444 | if (!qp->dma_chan) { |
1445 | dmaengine_put(); | |
282a2fee | 1446 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
94681194 | 1447 | } |
282a2fee | 1448 | |
fce8a7bb JM |
1449 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1450 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1451 | if (!entry) | |
1452 | goto err1; | |
1453 | ||
282a2fee | 1454 | entry->qp = qp; |
fce8a7bb | 1455 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1456 | &qp->rx_free_q); |
fce8a7bb JM |
1457 | } |
1458 | ||
1459 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1460 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1461 | if (!entry) | |
1462 | goto err2; | |
1463 | ||
282a2fee | 1464 | entry->qp = qp; |
fce8a7bb | 1465 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1466 | &qp->tx_free_q); |
fce8a7bb JM |
1467 | } |
1468 | ||
fce8a7bb JM |
1469 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, |
1470 | ntb_transport_rxc_db); | |
1471 | if (rc) | |
e8aeb60c | 1472 | goto err2; |
fce8a7bb JM |
1473 | |
1474 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1475 | ||
1476 | return qp; | |
1477 | ||
fce8a7bb | 1478 | err2: |
f766755c | 1479 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1480 | kfree(entry); |
1481 | err1: | |
f766755c | 1482 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1483 | kfree(entry); |
94681194 JM |
1484 | if (qp->dma_chan) |
1485 | dmaengine_put(); | |
fce8a7bb JM |
1486 | set_bit(free_queue, &nt->qp_bitmap); |
1487 | err: | |
1488 | return NULL; | |
1489 | } | |
1490 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1491 | ||
1492 | /** | |
1493 | * ntb_transport_free_queue - Frees NTB transport queue | |
1494 | * @qp: NTB queue to be freed | |
1495 | * | |
1496 | * Frees NTB transport queue | |
1497 | */ | |
1498 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1499 | { | |
186f27ff | 1500 | struct pci_dev *pdev; |
fce8a7bb JM |
1501 | struct ntb_queue_entry *entry; |
1502 | ||
1503 | if (!qp) | |
1504 | return; | |
1505 | ||
186f27ff JM |
1506 | pdev = ntb_query_pdev(qp->ndev); |
1507 | ||
282a2fee JM |
1508 | if (qp->dma_chan) { |
1509 | struct dma_chan *chan = qp->dma_chan; | |
1510 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1511 | * processed by the CPU instead of the DAM engine | |
1512 | */ | |
1513 | qp->dma_chan = NULL; | |
1514 | ||
1515 | /* Try to be nice and wait for any queued DMA engine | |
1516 | * transactions to process before smashing it with a rock | |
1517 | */ | |
1518 | dma_sync_wait(chan, qp->last_cookie); | |
1519 | dmaengine_terminate_all(chan); | |
1520 | dmaengine_put(); | |
1521 | } | |
fce8a7bb JM |
1522 | |
1523 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
fce8a7bb | 1524 | |
282a2fee JM |
1525 | cancel_delayed_work_sync(&qp->link_work); |
1526 | ||
f766755c | 1527 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1528 | kfree(entry); |
1529 | ||
f766755c | 1530 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1531 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1532 | kfree(entry); | |
1533 | } | |
1534 | ||
f766755c | 1535 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1536 | kfree(entry); |
1537 | ||
1538 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1539 | ||
1540 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1541 | } | |
1542 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1543 | ||
1544 | /** | |
1545 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1546 | * @qp: NTB queue to be freed | |
1547 | * @len: pointer to variable to write enqueued buffers length | |
1548 | * | |
1549 | * Dequeues unused buffers from receive queue. Should only be used during | |
1550 | * shutdown of qp. | |
1551 | * | |
1552 | * RETURNS: NULL error value on error, or void* for success. | |
1553 | */ | |
1554 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1555 | { | |
1556 | struct ntb_queue_entry *entry; | |
1557 | void *buf; | |
1558 | ||
1559 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1560 | return NULL; | |
1561 | ||
1562 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1563 | if (!entry) | |
1564 | return NULL; | |
1565 | ||
1566 | buf = entry->cb_data; | |
1567 | *len = entry->len; | |
1568 | ||
f766755c | 1569 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1570 | |
1571 | return buf; | |
1572 | } | |
1573 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1574 | ||
1575 | /** | |
1576 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1577 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1578 | * @cb: per buffer pointer for callback function to use | |
1579 | * @data: pointer to data buffer that incoming packets will be copied into | |
1580 | * @len: length of the data buffer | |
1581 | * | |
1582 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1583 | * payload can be received into. | |
1584 | * | |
1585 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1586 | */ | |
1587 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1588 | unsigned int len) | |
1589 | { | |
1590 | struct ntb_queue_entry *entry; | |
1591 | ||
1592 | if (!qp) | |
1593 | return -EINVAL; | |
1594 | ||
1595 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1596 | if (!entry) | |
1597 | return -ENOMEM; | |
1598 | ||
1599 | entry->cb_data = cb; | |
1600 | entry->buf = data; | |
1601 | entry->len = len; | |
1602 | ||
f766755c | 1603 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1604 | |
1605 | return 0; | |
1606 | } | |
1607 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1608 | ||
1609 | /** | |
1610 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1611 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1612 | * @cb: per buffer pointer for callback function to use | |
1613 | * @data: pointer to data buffer that will be sent | |
1614 | * @len: length of the data buffer | |
1615 | * | |
1616 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1617 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1618 | * serialize access to the qp. |
1619 | * | |
1620 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1621 | */ | |
1622 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1623 | unsigned int len) | |
1624 | { | |
1625 | struct ntb_queue_entry *entry; | |
1626 | int rc; | |
1627 | ||
1628 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1632 | if (!entry) { |
1633 | qp->tx_err_no_buf++; | |
fce8a7bb | 1634 | return -ENOMEM; |
282a2fee | 1635 | } |
fce8a7bb JM |
1636 | |
1637 | entry->cb_data = cb; | |
1638 | entry->buf = data; | |
1639 | entry->len = len; | |
1640 | entry->flags = 0; | |
1641 | ||
1642 | rc = ntb_process_tx(qp, entry); | |
1643 | if (rc) | |
1644 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1645 | &qp->tx_free_q); | |
1646 | ||
1647 | return rc; | |
1648 | } | |
1649 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1650 | ||
1651 | /** | |
1652 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1653 | * @qp: NTB transport layer queue to be enabled | |
1654 | * | |
1655 | * Notify NTB transport layer of client readiness to use queue | |
1656 | */ | |
1657 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1658 | { | |
1659 | if (!qp) | |
1660 | return; | |
1661 | ||
1662 | qp->client_ready = NTB_LINK_UP; | |
1663 | ||
1664 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1665 | schedule_delayed_work(&qp->link_work, 0); | |
1666 | } | |
1667 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1668 | ||
1669 | /** | |
1670 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1671 | * @qp: NTB transport layer queue to be disabled | |
1672 | * | |
1673 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1674 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1675 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1676 | */ |
1677 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1678 | { | |
186f27ff | 1679 | struct pci_dev *pdev; |
fce8a7bb JM |
1680 | int rc, val; |
1681 | ||
1682 | if (!qp) | |
1683 | return; | |
1684 | ||
186f27ff | 1685 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1686 | qp->client_ready = NTB_LINK_DOWN; |
1687 | ||
1688 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1689 | if (rc) { | |
1690 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1691 | return; | |
1692 | } | |
1693 | ||
1694 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1695 | val & ~(1 << qp->qp_num)); | |
1696 | if (rc) | |
1697 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1698 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1699 | ||
1700 | if (qp->qp_link == NTB_LINK_UP) | |
1701 | ntb_send_link_down(qp); | |
1702 | else | |
1703 | cancel_delayed_work_sync(&qp->link_work); | |
1704 | } | |
1705 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1706 | ||
1707 | /** | |
1708 | * ntb_transport_link_query - Query transport link state | |
1709 | * @qp: NTB transport layer queue to be queried | |
1710 | * | |
1711 | * Query connectivity to the remote system of the NTB transport queue | |
1712 | * | |
1713 | * RETURNS: true for link up or false for link down | |
1714 | */ | |
1715 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1716 | { | |
186f27ff JM |
1717 | if (!qp) |
1718 | return false; | |
1719 | ||
fce8a7bb JM |
1720 | return qp->qp_link == NTB_LINK_UP; |
1721 | } | |
1722 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1723 | ||
1724 | /** | |
1725 | * ntb_transport_qp_num - Query the qp number | |
1726 | * @qp: NTB transport layer queue to be queried | |
1727 | * | |
1728 | * Query qp number of the NTB transport queue | |
1729 | * | |
1730 | * RETURNS: a zero based number specifying the qp number | |
1731 | */ | |
1732 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1733 | { | |
186f27ff JM |
1734 | if (!qp) |
1735 | return 0; | |
1736 | ||
fce8a7bb JM |
1737 | return qp->qp_num; |
1738 | } | |
1739 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1740 | ||
1741 | /** | |
1742 | * ntb_transport_max_size - Query the max payload size of a qp | |
1743 | * @qp: NTB transport layer queue to be queried | |
1744 | * | |
1745 | * Query the maximum payload size permissible on the given qp | |
1746 | * | |
1747 | * RETURNS: the max payload size of a qp | |
1748 | */ | |
ef114ed5 | 1749 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1750 | { |
282a2fee JM |
1751 | unsigned int max; |
1752 | ||
186f27ff JM |
1753 | if (!qp) |
1754 | return 0; | |
1755 | ||
282a2fee JM |
1756 | if (!qp->dma_chan) |
1757 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1758 | ||
1759 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1760 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1761 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1762 | ||
1763 | return max; | |
fce8a7bb JM |
1764 | } |
1765 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |