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> | |
fce8a7bb JM |
59 | #include "ntb_hw.h" |
60 | ||
113fc505 | 61 | #define NTB_TRANSPORT_VERSION 3 |
fce8a7bb | 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 | ||
948d3a65 | 67 | static unsigned char max_num_clients; |
fce8a7bb JM |
68 | module_param(max_num_clients, byte, 0644); |
69 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
70 | ||
282a2fee JM |
71 | static unsigned int copy_bytes = 1024; |
72 | module_param(copy_bytes, uint, 0644); | |
73 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
74 | ||
fce8a7bb JM |
75 | struct ntb_queue_entry { |
76 | /* ntb_queue list reference */ | |
77 | struct list_head entry; | |
78 | /* pointers to data to be transfered */ | |
79 | void *cb_data; | |
80 | void *buf; | |
81 | unsigned int len; | |
82 | unsigned int flags; | |
282a2fee JM |
83 | |
84 | struct ntb_transport_qp *qp; | |
85 | union { | |
86 | struct ntb_payload_header __iomem *tx_hdr; | |
87 | struct ntb_payload_header *rx_hdr; | |
88 | }; | |
89 | unsigned int index; | |
fce8a7bb JM |
90 | }; |
91 | ||
793c20e9 JM |
92 | struct ntb_rx_info { |
93 | unsigned int entry; | |
94 | }; | |
95 | ||
fce8a7bb JM |
96 | struct ntb_transport_qp { |
97 | struct ntb_transport *transport; | |
98 | struct ntb_device *ndev; | |
99 | void *cb_data; | |
282a2fee | 100 | struct dma_chan *dma_chan; |
fce8a7bb JM |
101 | |
102 | bool client_ready; | |
103 | bool qp_link; | |
104 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ | |
105 | ||
74465645 | 106 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
107 | struct ntb_rx_info *remote_rx_info; |
108 | ||
53ca4fea JM |
109 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
110 | void *data, int len); | |
fce8a7bb JM |
111 | struct list_head tx_free_q; |
112 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 113 | void __iomem *tx_mw; |
282a2fee | 114 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
115 | unsigned int tx_index; |
116 | unsigned int tx_max_entry; | |
ef114ed5 | 117 | unsigned int tx_max_frame; |
fce8a7bb | 118 | |
53ca4fea JM |
119 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
120 | void *data, int len); | |
fce8a7bb JM |
121 | struct list_head rx_pend_q; |
122 | struct list_head rx_free_q; | |
123 | spinlock_t ntb_rx_pend_q_lock; | |
124 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
125 | void *rx_buff; |
126 | unsigned int rx_index; | |
127 | unsigned int rx_max_entry; | |
ef114ed5 | 128 | unsigned int rx_max_frame; |
282a2fee | 129 | dma_cookie_t last_cookie; |
fce8a7bb | 130 | |
53ca4fea | 131 | void (*event_handler)(void *data, int status); |
fce8a7bb | 132 | struct delayed_work link_work; |
7b4f2d3c | 133 | struct work_struct link_cleanup; |
fce8a7bb JM |
134 | |
135 | struct dentry *debugfs_dir; | |
136 | struct dentry *debugfs_stats; | |
137 | ||
138 | /* Stats */ | |
139 | u64 rx_bytes; | |
140 | u64 rx_pkts; | |
141 | u64 rx_ring_empty; | |
142 | u64 rx_err_no_buf; | |
143 | u64 rx_err_oflow; | |
144 | u64 rx_err_ver; | |
282a2fee JM |
145 | u64 rx_memcpy; |
146 | u64 rx_async; | |
fce8a7bb JM |
147 | u64 tx_bytes; |
148 | u64 tx_pkts; | |
149 | u64 tx_ring_full; | |
282a2fee JM |
150 | u64 tx_err_no_buf; |
151 | u64 tx_memcpy; | |
152 | u64 tx_async; | |
fce8a7bb JM |
153 | }; |
154 | ||
155 | struct ntb_transport_mw { | |
156 | size_t size; | |
157 | void *virt_addr; | |
158 | dma_addr_t dma_addr; | |
159 | }; | |
160 | ||
161 | struct ntb_transport_client_dev { | |
162 | struct list_head entry; | |
163 | struct device dev; | |
164 | }; | |
165 | ||
166 | struct ntb_transport { | |
167 | struct list_head entry; | |
168 | struct list_head client_devs; | |
169 | ||
170 | struct ntb_device *ndev; | |
948d3a65 | 171 | struct ntb_transport_mw *mw; |
fce8a7bb JM |
172 | struct ntb_transport_qp *qps; |
173 | unsigned int max_qps; | |
174 | unsigned long qp_bitmap; | |
175 | bool transport_link; | |
176 | struct delayed_work link_work; | |
7b4f2d3c | 177 | struct work_struct link_cleanup; |
fce8a7bb JM |
178 | }; |
179 | ||
180 | enum { | |
181 | DESC_DONE_FLAG = 1 << 0, | |
182 | LINK_DOWN_FLAG = 1 << 1, | |
183 | }; | |
184 | ||
185 | struct ntb_payload_header { | |
74465645 | 186 | unsigned int ver; |
fce8a7bb JM |
187 | unsigned int len; |
188 | unsigned int flags; | |
189 | }; | |
190 | ||
191 | enum { | |
192 | VERSION = 0, | |
fce8a7bb | 193 | QP_LINKS, |
113fc505 JM |
194 | NUM_QPS, |
195 | NUM_MWS, | |
196 | MW0_SZ_HIGH, | |
197 | MW0_SZ_LOW, | |
198 | MW1_SZ_HIGH, | |
199 | MW1_SZ_LOW, | |
fce8a7bb JM |
200 | MAX_SPAD, |
201 | }; | |
202 | ||
948d3a65 | 203 | #define QP_TO_MW(ndev, qp) ((qp) % ntb_max_mw(ndev)) |
fce8a7bb JM |
204 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
205 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
206 | ||
207 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
208 | { | |
209 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
210 | } | |
211 | ||
212 | static int ntb_client_probe(struct device *dev) | |
213 | { | |
214 | const struct ntb_client *drv = container_of(dev->driver, | |
215 | struct ntb_client, driver); | |
216 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
217 | int rc = -EINVAL; | |
218 | ||
219 | get_device(dev); | |
220 | if (drv && drv->probe) | |
221 | rc = drv->probe(pdev); | |
222 | if (rc) | |
223 | put_device(dev); | |
224 | ||
225 | return rc; | |
226 | } | |
227 | ||
228 | static int ntb_client_remove(struct device *dev) | |
229 | { | |
230 | const struct ntb_client *drv = container_of(dev->driver, | |
231 | struct ntb_client, driver); | |
232 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
233 | ||
234 | if (drv && drv->remove) | |
235 | drv->remove(pdev); | |
236 | ||
237 | put_device(dev); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
170d35a5 | 242 | static struct bus_type ntb_bus_type = { |
fce8a7bb JM |
243 | .name = "ntb_bus", |
244 | .match = ntb_match_bus, | |
245 | .probe = ntb_client_probe, | |
246 | .remove = ntb_client_remove, | |
247 | }; | |
248 | ||
249 | static LIST_HEAD(ntb_transport_list); | |
250 | ||
78a61ab7 | 251 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
252 | { |
253 | if (list_empty(&ntb_transport_list)) { | |
254 | int rc = bus_register(&ntb_bus_type); | |
255 | if (rc) | |
256 | return rc; | |
257 | } | |
258 | ||
259 | list_add(&nt->entry, &ntb_transport_list); | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
78a61ab7 | 264 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
265 | { |
266 | struct ntb_transport_client_dev *client_dev, *cd; | |
267 | ||
268 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
269 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
270 | dev_name(&client_dev->dev)); | |
271 | list_del(&client_dev->entry); | |
272 | device_unregister(&client_dev->dev); | |
273 | } | |
274 | ||
275 | list_del(&nt->entry); | |
276 | ||
277 | if (list_empty(&ntb_transport_list)) | |
278 | bus_unregister(&ntb_bus_type); | |
279 | } | |
280 | ||
281 | static void ntb_client_release(struct device *dev) | |
282 | { | |
283 | struct ntb_transport_client_dev *client_dev; | |
284 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
285 | ||
286 | kfree(client_dev); | |
287 | } | |
288 | ||
289 | /** | |
290 | * ntb_unregister_client_dev - Unregister NTB client device | |
291 | * @device_name: Name of NTB client device | |
292 | * | |
293 | * Unregister an NTB client device with the NTB transport layer | |
294 | */ | |
295 | void ntb_unregister_client_dev(char *device_name) | |
296 | { | |
297 | struct ntb_transport_client_dev *client, *cd; | |
298 | struct ntb_transport *nt; | |
299 | ||
300 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
301 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
302 | if (!strncmp(dev_name(&client->dev), device_name, | |
303 | strlen(device_name))) { | |
304 | list_del(&client->entry); | |
305 | device_unregister(&client->dev); | |
306 | } | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
309 | ||
310 | /** | |
311 | * ntb_register_client_dev - Register NTB client device | |
312 | * @device_name: Name of NTB client device | |
313 | * | |
314 | * Register an NTB client device with the NTB transport layer | |
315 | */ | |
316 | int ntb_register_client_dev(char *device_name) | |
317 | { | |
318 | struct ntb_transport_client_dev *client_dev; | |
319 | struct ntb_transport *nt; | |
8b19d450 | 320 | int rc, i = 0; |
fce8a7bb | 321 | |
8222b402 JM |
322 | if (list_empty(&ntb_transport_list)) |
323 | return -ENODEV; | |
324 | ||
fce8a7bb JM |
325 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
326 | struct device *dev; | |
327 | ||
328 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
329 | GFP_KERNEL); | |
330 | if (!client_dev) { | |
331 | rc = -ENOMEM; | |
332 | goto err; | |
333 | } | |
334 | ||
335 | dev = &client_dev->dev; | |
336 | ||
337 | /* setup and register client devices */ | |
8b19d450 | 338 | dev_set_name(dev, "%s%d", device_name, i); |
fce8a7bb JM |
339 | dev->bus = &ntb_bus_type; |
340 | dev->release = ntb_client_release; | |
341 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
342 | ||
343 | rc = device_register(dev); | |
344 | if (rc) { | |
345 | kfree(client_dev); | |
346 | goto err; | |
347 | } | |
348 | ||
349 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 350 | i++; |
fce8a7bb JM |
351 | } |
352 | ||
353 | return 0; | |
354 | ||
355 | err: | |
356 | ntb_unregister_client_dev(device_name); | |
357 | ||
358 | return rc; | |
359 | } | |
360 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
361 | ||
362 | /** | |
363 | * ntb_register_client - Register NTB client driver | |
364 | * @drv: NTB client driver to be registered | |
365 | * | |
366 | * Register an NTB client driver with the NTB transport layer | |
367 | * | |
368 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
369 | */ | |
370 | int ntb_register_client(struct ntb_client *drv) | |
371 | { | |
372 | drv->driver.bus = &ntb_bus_type; | |
373 | ||
8222b402 JM |
374 | if (list_empty(&ntb_transport_list)) |
375 | return -ENODEV; | |
376 | ||
fce8a7bb JM |
377 | return driver_register(&drv->driver); |
378 | } | |
379 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
380 | ||
381 | /** | |
382 | * ntb_unregister_client - Unregister NTB client driver | |
383 | * @drv: NTB client driver to be unregistered | |
384 | * | |
385 | * Unregister an NTB client driver with the NTB transport layer | |
386 | * | |
387 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
388 | */ | |
389 | void ntb_unregister_client(struct ntb_client *drv) | |
390 | { | |
391 | driver_unregister(&drv->driver); | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
394 | ||
fce8a7bb JM |
395 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
396 | loff_t *offp) | |
397 | { | |
398 | struct ntb_transport_qp *qp; | |
d7237e22 | 399 | char *buf; |
fce8a7bb JM |
400 | ssize_t ret, out_offset, out_count; |
401 | ||
282a2fee | 402 | out_count = 1000; |
d7237e22 JM |
403 | |
404 | buf = kmalloc(out_count, GFP_KERNEL); | |
405 | if (!buf) | |
406 | return -ENOMEM; | |
fce8a7bb JM |
407 | |
408 | qp = filp->private_data; | |
409 | out_offset = 0; | |
410 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
411 | "NTB QP stats\n"); | |
412 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
413 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
414 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
415 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
416 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
417 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
418 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
419 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
420 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
421 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
422 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
423 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
424 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
425 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
426 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
427 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
428 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 429 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 430 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 431 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 432 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 433 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
434 | |
435 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
436 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
437 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
438 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
439 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
440 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
441 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
442 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
443 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
444 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
445 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
446 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 447 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 448 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 449 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 450 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 451 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 452 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
453 | |
454 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d7237e22 | 455 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 456 | "Up" : "Down"); |
d7237e22 JM |
457 | if (out_offset > out_count) |
458 | out_offset = out_count; | |
fce8a7bb JM |
459 | |
460 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 461 | kfree(buf); |
fce8a7bb JM |
462 | return ret; |
463 | } | |
464 | ||
465 | static const struct file_operations ntb_qp_debugfs_stats = { | |
466 | .owner = THIS_MODULE, | |
d66d7ac2 | 467 | .open = simple_open, |
fce8a7bb JM |
468 | .read = debugfs_read, |
469 | }; | |
470 | ||
471 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
472 | struct list_head *list) | |
473 | { | |
474 | unsigned long flags; | |
475 | ||
476 | spin_lock_irqsave(lock, flags); | |
477 | list_add_tail(entry, list); | |
478 | spin_unlock_irqrestore(lock, flags); | |
479 | } | |
480 | ||
481 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 482 | struct list_head *list) |
fce8a7bb JM |
483 | { |
484 | struct ntb_queue_entry *entry; | |
485 | unsigned long flags; | |
486 | ||
487 | spin_lock_irqsave(lock, flags); | |
488 | if (list_empty(list)) { | |
489 | entry = NULL; | |
490 | goto out; | |
491 | } | |
492 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
493 | list_del(&entry->entry); | |
494 | out: | |
495 | spin_unlock_irqrestore(lock, flags); | |
496 | ||
497 | return entry; | |
498 | } | |
499 | ||
500 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
501 | unsigned int qp_num) | |
502 | { | |
503 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 504 | unsigned int rx_size, num_qps_mw; |
948d3a65 | 505 | u8 mw_num, mw_max; |
793c20e9 | 506 | unsigned int i; |
fce8a7bb | 507 | |
948d3a65 JM |
508 | mw_max = ntb_max_mw(nt->ndev); |
509 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
510 | ||
74465645 | 511 | WARN_ON(nt->mw[mw_num].virt_addr == NULL); |
fce8a7bb | 512 | |
948d3a65 JM |
513 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
514 | num_qps_mw = nt->max_qps / mw_max + 1; | |
fce8a7bb | 515 | else |
948d3a65 | 516 | num_qps_mw = nt->max_qps / mw_max; |
fce8a7bb | 517 | |
793c20e9 | 518 | rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; |
282a2fee | 519 | qp->rx_buff = nt->mw[mw_num].virt_addr + qp_num / mw_max * rx_size; |
793c20e9 JM |
520 | rx_size -= sizeof(struct ntb_rx_info); |
521 | ||
282a2fee JM |
522 | qp->remote_rx_info = qp->rx_buff + rx_size; |
523 | ||
c9d534c8 JM |
524 | /* Due to housekeeping, there must be atleast 2 buffs */ |
525 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
526 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
527 | qp->rx_index = 0; | |
528 | ||
c9d534c8 | 529 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 530 | |
ef114ed5 | 531 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
532 | for (i = 0; i < qp->rx_max_entry; i++) { |
533 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
534 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 535 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 536 | } |
fce8a7bb JM |
537 | |
538 | qp->rx_pkts = 0; | |
539 | qp->tx_pkts = 0; | |
90f9e934 | 540 | qp->tx_index = 0; |
fce8a7bb JM |
541 | } |
542 | ||
b77b2637 JM |
543 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
544 | { | |
545 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
546 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
547 | ||
548 | if (!mw->virt_addr) | |
549 | return; | |
550 | ||
551 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
552 | mw->virt_addr = NULL; | |
553 | } | |
554 | ||
fce8a7bb JM |
555 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) |
556 | { | |
557 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
558 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb | 559 | |
b77b2637 JM |
560 | /* No need to re-setup */ |
561 | if (mw->size == ALIGN(size, 4096)) | |
562 | return 0; | |
563 | ||
564 | if (mw->size != 0) | |
565 | ntb_free_mw(nt, num_mw); | |
566 | ||
fce8a7bb JM |
567 | /* Alloc memory for receiving data. Must be 4k aligned */ |
568 | mw->size = ALIGN(size, 4096); | |
569 | ||
570 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
571 | GFP_KERNEL); | |
572 | if (!mw->virt_addr) { | |
b77b2637 | 573 | mw->size = 0; |
fce8a7bb JM |
574 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", |
575 | (int) mw->size); | |
576 | return -ENOMEM; | |
577 | } | |
578 | ||
fce8a7bb JM |
579 | /* Notify HW the memory location of the receive buffer */ |
580 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
fca4d518 | 585 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb JM |
586 | { |
587 | struct ntb_transport *nt = qp->transport; | |
588 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
589 | ||
590 | if (qp->qp_link == NTB_LINK_DOWN) { | |
591 | cancel_delayed_work_sync(&qp->link_work); | |
592 | return; | |
593 | } | |
594 | ||
595 | if (qp->event_handler) | |
596 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
597 | ||
598 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
599 | qp->qp_link = NTB_LINK_DOWN; | |
fca4d518 JM |
600 | } |
601 | ||
602 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
603 | { | |
604 | struct ntb_transport_qp *qp = container_of(work, | |
605 | struct ntb_transport_qp, | |
606 | link_cleanup); | |
607 | struct ntb_transport *nt = qp->transport; | |
608 | ||
609 | ntb_qp_link_cleanup(qp); | |
fce8a7bb JM |
610 | |
611 | if (nt->transport_link == NTB_LINK_UP) | |
612 | schedule_delayed_work(&qp->link_work, | |
613 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
614 | } | |
615 | ||
7b4f2d3c JM |
616 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
617 | { | |
618 | schedule_work(&qp->link_cleanup); | |
619 | } | |
620 | ||
fca4d518 | 621 | static void ntb_transport_link_cleanup(struct ntb_transport *nt) |
fce8a7bb JM |
622 | { |
623 | int i; | |
624 | ||
fca4d518 JM |
625 | /* Pass along the info to any clients */ |
626 | for (i = 0; i < nt->max_qps; i++) | |
627 | if (!test_bit(i, &nt->qp_bitmap)) | |
628 | ntb_qp_link_cleanup(&nt->qps[i]); | |
629 | ||
fce8a7bb JM |
630 | if (nt->transport_link == NTB_LINK_DOWN) |
631 | cancel_delayed_work_sync(&nt->link_work); | |
632 | else | |
633 | nt->transport_link = NTB_LINK_DOWN; | |
634 | ||
fce8a7bb JM |
635 | /* The scratchpad registers keep the values if the remote side |
636 | * goes down, blast them now to give them a sane value the next | |
637 | * time they are accessed | |
638 | */ | |
639 | for (i = 0; i < MAX_SPAD; i++) | |
640 | ntb_write_local_spad(nt->ndev, i, 0); | |
641 | } | |
642 | ||
fca4d518 JM |
643 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
644 | { | |
645 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
646 | link_cleanup); | |
647 | ||
648 | ntb_transport_link_cleanup(nt); | |
649 | } | |
650 | ||
fce8a7bb JM |
651 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) |
652 | { | |
653 | struct ntb_transport *nt = data; | |
654 | ||
655 | switch (event) { | |
656 | case NTB_EVENT_HW_LINK_UP: | |
657 | schedule_delayed_work(&nt->link_work, 0); | |
658 | break; | |
659 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 660 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
661 | break; |
662 | default: | |
663 | BUG(); | |
664 | } | |
665 | } | |
666 | ||
667 | static void ntb_transport_link_work(struct work_struct *work) | |
668 | { | |
669 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
670 | link_work.work); | |
671 | struct ntb_device *ndev = nt->ndev; | |
672 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
673 | u32 val; | |
674 | int rc, i; | |
675 | ||
113fc505 | 676 | /* send the local info, in the opposite order of the way we read it */ |
948d3a65 | 677 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 JM |
678 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), |
679 | ntb_get_mw_size(ndev, i) >> 32); | |
680 | if (rc) { | |
681 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
682 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
683 | MW0_SZ_HIGH + (i * 2)); | |
684 | goto out; | |
685 | } | |
fce8a7bb | 686 | |
113fc505 JM |
687 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
688 | (u32) ntb_get_mw_size(ndev, i)); | |
689 | if (rc) { | |
690 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
691 | (u32) ntb_get_mw_size(ndev, i), | |
692 | MW0_SZ_LOW + (i * 2)); | |
693 | goto out; | |
694 | } | |
fce8a7bb JM |
695 | } |
696 | ||
948d3a65 | 697 | rc = ntb_write_remote_spad(ndev, NUM_MWS, ntb_max_mw(ndev)); |
fce8a7bb JM |
698 | if (rc) { |
699 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
948d3a65 | 700 | ntb_max_mw(ndev), NUM_MWS); |
fce8a7bb JM |
701 | goto out; |
702 | } | |
703 | ||
704 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
705 | if (rc) { | |
706 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
707 | nt->max_qps, NUM_QPS); | |
708 | goto out; | |
709 | } | |
710 | ||
113fc505 | 711 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
712 | if (rc) { |
713 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 714 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
715 | goto out; |
716 | } | |
717 | ||
718 | /* Query the remote side for its info */ | |
719 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
720 | if (rc) { | |
721 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
722 | goto out; | |
723 | } | |
724 | ||
725 | if (val != NTB_TRANSPORT_VERSION) | |
726 | goto out; | |
727 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
728 | ||
729 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
730 | if (rc) { | |
731 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
732 | goto out; | |
733 | } | |
734 | ||
735 | if (val != nt->max_qps) | |
736 | goto out; | |
737 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
738 | ||
113fc505 | 739 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 740 | if (rc) { |
113fc505 | 741 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
742 | goto out; |
743 | } | |
744 | ||
948d3a65 | 745 | if (val != ntb_max_mw(ndev)) |
fce8a7bb | 746 | goto out; |
113fc505 | 747 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 748 | |
948d3a65 | 749 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 | 750 | u64 val64; |
fce8a7bb | 751 | |
113fc505 JM |
752 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
753 | if (rc) { | |
754 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
755 | MW0_SZ_HIGH + (i * 2)); | |
756 | goto out1; | |
757 | } | |
fce8a7bb | 758 | |
113fc505 | 759 | val64 = (u64) val << 32; |
fce8a7bb | 760 | |
113fc505 JM |
761 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
762 | if (rc) { | |
763 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
764 | MW0_SZ_LOW + (i * 2)); | |
765 | goto out1; | |
766 | } | |
767 | ||
768 | val64 |= val; | |
769 | ||
770 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
771 | ||
772 | rc = ntb_set_mw(nt, i, val64); | |
773 | if (rc) | |
774 | goto out1; | |
775 | } | |
fce8a7bb JM |
776 | |
777 | nt->transport_link = NTB_LINK_UP; | |
778 | ||
779 | for (i = 0; i < nt->max_qps; i++) { | |
780 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
781 | ||
782 | ntb_transport_setup_qp_mw(nt, i); | |
783 | ||
784 | if (qp->client_ready == NTB_LINK_UP) | |
785 | schedule_delayed_work(&qp->link_work, 0); | |
786 | } | |
787 | ||
788 | return; | |
789 | ||
113fc505 | 790 | out1: |
948d3a65 | 791 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 792 | ntb_free_mw(nt, i); |
fce8a7bb JM |
793 | out: |
794 | if (ntb_hw_link_status(ndev)) | |
795 | schedule_delayed_work(&nt->link_work, | |
796 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
797 | } | |
798 | ||
799 | static void ntb_qp_link_work(struct work_struct *work) | |
800 | { | |
801 | struct ntb_transport_qp *qp = container_of(work, | |
802 | struct ntb_transport_qp, | |
803 | link_work.work); | |
804 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
805 | struct ntb_transport *nt = qp->transport; | |
806 | int rc, val; | |
807 | ||
808 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
809 | ||
810 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
811 | if (rc) { | |
812 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
813 | return; | |
814 | } | |
815 | ||
816 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
817 | if (rc) | |
818 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
819 | val | 1 << qp->qp_num, QP_LINKS); | |
820 | ||
821 | /* query remote spad for qp ready bits */ | |
822 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
823 | if (rc) | |
824 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
825 | ||
826 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
827 | ||
828 | /* See if the remote side is up */ | |
829 | if (1 << qp->qp_num & val) { | |
830 | qp->qp_link = NTB_LINK_UP; | |
831 | ||
832 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
833 | if (qp->event_handler) | |
834 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
835 | } else if (nt->transport_link == NTB_LINK_UP) | |
836 | schedule_delayed_work(&qp->link_work, | |
837 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
838 | } | |
839 | ||
282a2fee | 840 | static int ntb_transport_init_queue(struct ntb_transport *nt, |
53ca4fea | 841 | unsigned int qp_num) |
fce8a7bb JM |
842 | { |
843 | struct ntb_transport_qp *qp; | |
ef114ed5 | 844 | unsigned int num_qps_mw, tx_size; |
948d3a65 | 845 | u8 mw_num, mw_max; |
282a2fee | 846 | u64 qp_offset; |
948d3a65 JM |
847 | |
848 | mw_max = ntb_max_mw(nt->ndev); | |
849 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
fce8a7bb JM |
850 | |
851 | qp = &nt->qps[qp_num]; | |
852 | qp->qp_num = qp_num; | |
853 | qp->transport = nt; | |
854 | qp->ndev = nt->ndev; | |
855 | qp->qp_link = NTB_LINK_DOWN; | |
856 | qp->client_ready = NTB_LINK_DOWN; | |
857 | qp->event_handler = NULL; | |
858 | ||
948d3a65 JM |
859 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
860 | num_qps_mw = nt->max_qps / mw_max + 1; | |
ef114ed5 | 861 | else |
948d3a65 | 862 | num_qps_mw = nt->max_qps / mw_max; |
ef114ed5 | 863 | |
793c20e9 | 864 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
282a2fee JM |
865 | qp_offset = qp_num / mw_max * tx_size; |
866 | qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset; | |
867 | if (!qp->tx_mw) | |
868 | return -EINVAL; | |
869 | ||
870 | qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset; | |
871 | if (!qp->tx_mw_phys) | |
872 | return -EINVAL; | |
873 | ||
793c20e9 | 874 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 875 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 876 | |
c9d534c8 JM |
877 | /* Due to housekeeping, there must be atleast 2 buffs */ |
878 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 879 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 880 | |
1517a3f2 | 881 | if (ntb_query_debugfs(nt->ndev)) { |
fce8a7bb JM |
882 | char debugfs_name[4]; |
883 | ||
884 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
885 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
1517a3f2 | 886 | ntb_query_debugfs(nt->ndev)); |
fce8a7bb JM |
887 | |
888 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
889 | qp->debugfs_dir, qp, | |
890 | &ntb_qp_debugfs_stats); | |
891 | } | |
892 | ||
893 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 894 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
895 | |
896 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
897 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
898 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
899 | ||
900 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
901 | INIT_LIST_HEAD(&qp->rx_free_q); | |
902 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee JM |
903 | |
904 | return 0; | |
fce8a7bb JM |
905 | } |
906 | ||
907 | int ntb_transport_init(struct pci_dev *pdev) | |
908 | { | |
909 | struct ntb_transport *nt; | |
910 | int rc, i; | |
911 | ||
912 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
913 | if (!nt) | |
914 | return -ENOMEM; | |
915 | ||
fce8a7bb JM |
916 | nt->ndev = ntb_register_transport(pdev, nt); |
917 | if (!nt->ndev) { | |
918 | rc = -EIO; | |
919 | goto err; | |
920 | } | |
921 | ||
948d3a65 JM |
922 | nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw), |
923 | GFP_KERNEL); | |
924 | if (!nt->mw) { | |
925 | rc = -ENOMEM; | |
926 | goto err1; | |
927 | } | |
928 | ||
929 | if (max_num_clients) | |
930 | nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients); | |
931 | else | |
932 | nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev)); | |
fce8a7bb JM |
933 | |
934 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
935 | GFP_KERNEL); | |
936 | if (!nt->qps) { | |
937 | rc = -ENOMEM; | |
948d3a65 | 938 | goto err2; |
fce8a7bb JM |
939 | } |
940 | ||
941 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
942 | ||
282a2fee JM |
943 | for (i = 0; i < nt->max_qps; i++) { |
944 | rc = ntb_transport_init_queue(nt, i); | |
945 | if (rc) | |
946 | goto err3; | |
947 | } | |
fce8a7bb JM |
948 | |
949 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 950 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb JM |
951 | |
952 | rc = ntb_register_event_callback(nt->ndev, | |
953 | ntb_transport_event_callback); | |
954 | if (rc) | |
948d3a65 | 955 | goto err3; |
fce8a7bb JM |
956 | |
957 | INIT_LIST_HEAD(&nt->client_devs); | |
958 | rc = ntb_bus_init(nt); | |
959 | if (rc) | |
948d3a65 | 960 | goto err4; |
fce8a7bb JM |
961 | |
962 | if (ntb_hw_link_status(nt->ndev)) | |
963 | schedule_delayed_work(&nt->link_work, 0); | |
964 | ||
965 | return 0; | |
966 | ||
948d3a65 | 967 | err4: |
fce8a7bb | 968 | ntb_unregister_event_callback(nt->ndev); |
948d3a65 | 969 | err3: |
fce8a7bb | 970 | kfree(nt->qps); |
948d3a65 JM |
971 | err2: |
972 | kfree(nt->mw); | |
fce8a7bb JM |
973 | err1: |
974 | ntb_unregister_transport(nt->ndev); | |
975 | err: | |
fce8a7bb JM |
976 | kfree(nt); |
977 | return rc; | |
978 | } | |
979 | ||
980 | void ntb_transport_free(void *transport) | |
981 | { | |
982 | struct ntb_transport *nt = transport; | |
948d3a65 | 983 | struct ntb_device *ndev = nt->ndev; |
fce8a7bb JM |
984 | int i; |
985 | ||
fca4d518 | 986 | ntb_transport_link_cleanup(nt); |
fce8a7bb JM |
987 | |
988 | /* verify that all the qp's are freed */ | |
1517a3f2 | 989 | for (i = 0; i < nt->max_qps; i++) { |
fce8a7bb JM |
990 | if (!test_bit(i, &nt->qp_bitmap)) |
991 | ntb_transport_free_queue(&nt->qps[i]); | |
1517a3f2 JM |
992 | debugfs_remove_recursive(nt->qps[i].debugfs_dir); |
993 | } | |
fce8a7bb JM |
994 | |
995 | ntb_bus_remove(nt); | |
996 | ||
997 | cancel_delayed_work_sync(&nt->link_work); | |
998 | ||
948d3a65 | 999 | ntb_unregister_event_callback(ndev); |
fce8a7bb | 1000 | |
948d3a65 | 1001 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 1002 | ntb_free_mw(nt, i); |
fce8a7bb JM |
1003 | |
1004 | kfree(nt->qps); | |
948d3a65 JM |
1005 | kfree(nt->mw); |
1006 | ntb_unregister_transport(ndev); | |
fce8a7bb JM |
1007 | kfree(nt); |
1008 | } | |
1009 | ||
282a2fee | 1010 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1011 | { |
282a2fee JM |
1012 | struct ntb_queue_entry *entry = data; |
1013 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1014 | void *cb_data = entry->cb_data; |
1015 | unsigned int len = entry->len; | |
282a2fee JM |
1016 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1017 | ||
1018 | /* Ensure that the data is fully copied out before clearing the flag */ | |
1019 | wmb(); | |
1020 | hdr->flags = 0; | |
fce8a7bb | 1021 | |
282a2fee | 1022 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1023 | |
1024 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
1025 | |
1026 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
1027 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
1028 | } |
1029 | ||
282a2fee JM |
1030 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1031 | { | |
1032 | void *buf = entry->buf; | |
1033 | size_t len = entry->len; | |
1034 | ||
1035 | memcpy(buf, offset, len); | |
1036 | ||
1037 | ntb_rx_copy_callback(entry); | |
1038 | } | |
1039 | ||
1040 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1041 | size_t len) | |
1042 | { | |
1043 | struct dma_async_tx_descriptor *txd; | |
1044 | struct ntb_transport_qp *qp = entry->qp; | |
1045 | struct dma_chan *chan = qp->dma_chan; | |
1046 | struct dma_device *device; | |
1047 | size_t pay_off, buff_off; | |
6f57fd05 | 1048 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1049 | dma_cookie_t cookie; |
1050 | void *buf = entry->buf; | |
282a2fee JM |
1051 | |
1052 | entry->len = len; | |
1053 | ||
1054 | if (!chan) | |
1055 | goto err; | |
1056 | ||
53ca4fea | 1057 | if (len < copy_bytes) |
6f57fd05 | 1058 | goto err_wait; |
282a2fee JM |
1059 | |
1060 | device = chan->device; | |
1061 | pay_off = (size_t) offset & ~PAGE_MASK; | |
1062 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1063 | ||
1064 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1065 | goto err_wait; |
282a2fee | 1066 | |
6f57fd05 BZ |
1067 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1068 | if (!unmap) | |
1069 | goto err_wait; | |
282a2fee | 1070 | |
6f57fd05 BZ |
1071 | unmap->len = len; |
1072 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1073 | pay_off, len, DMA_TO_DEVICE); | |
1074 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1075 | goto err_get_unmap; | |
1076 | ||
1077 | unmap->to_cnt = 1; | |
282a2fee | 1078 | |
6f57fd05 BZ |
1079 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1080 | buff_off, len, DMA_FROM_DEVICE); | |
1081 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1082 | goto err_get_unmap; | |
1083 | ||
1084 | unmap->from_cnt = 1; | |
1085 | ||
6f57fd05 | 1086 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1087 | unmap->addr[0], len, |
1088 | DMA_PREP_INTERRUPT); | |
282a2fee | 1089 | if (!txd) |
6f57fd05 | 1090 | goto err_get_unmap; |
282a2fee JM |
1091 | |
1092 | txd->callback = ntb_rx_copy_callback; | |
1093 | txd->callback_param = entry; | |
6f57fd05 | 1094 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1095 | |
1096 | cookie = dmaengine_submit(txd); | |
1097 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1098 | goto err_set_unmap; |
1099 | ||
1100 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1101 | |
1102 | qp->last_cookie = cookie; | |
1103 | ||
1104 | qp->rx_async++; | |
1105 | ||
1106 | return; | |
1107 | ||
6f57fd05 BZ |
1108 | err_set_unmap: |
1109 | dmaengine_unmap_put(unmap); | |
1110 | err_get_unmap: | |
1111 | dmaengine_unmap_put(unmap); | |
1112 | err_wait: | |
282a2fee JM |
1113 | /* If the callbacks come out of order, the writing of the index to the |
1114 | * last completed will be out of order. This may result in the | |
1115 | * receive stalling forever. | |
1116 | */ | |
1117 | dma_sync_wait(chan, qp->last_cookie); | |
1118 | err: | |
1119 | ntb_memcpy_rx(entry, offset); | |
1120 | qp->rx_memcpy++; | |
1121 | } | |
1122 | ||
fce8a7bb JM |
1123 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1124 | { | |
1125 | struct ntb_payload_header *hdr; | |
1126 | struct ntb_queue_entry *entry; | |
1127 | void *offset; | |
1128 | ||
793c20e9 JM |
1129 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1130 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1131 | ||
fce8a7bb JM |
1132 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1133 | if (!entry) { | |
fce8a7bb | 1134 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1135 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
1136 | hdr->ver, hdr->len, hdr->flags); |
1137 | qp->rx_err_no_buf++; | |
1138 | return -ENOMEM; | |
1139 | } | |
1140 | ||
fce8a7bb JM |
1141 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
1142 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1143 | &qp->rx_pend_q); |
fce8a7bb JM |
1144 | qp->rx_ring_empty++; |
1145 | return -EAGAIN; | |
1146 | } | |
1147 | ||
74465645 | 1148 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 1149 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1150 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
1151 | qp->qp_num, qp->rx_pkts, hdr->ver); |
1152 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1153 | &qp->rx_pend_q); |
fce8a7bb JM |
1154 | qp->rx_err_ver++; |
1155 | return -EIO; | |
1156 | } | |
1157 | ||
1158 | if (hdr->flags & LINK_DOWN_FLAG) { | |
1159 | ntb_qp_link_down(qp); | |
1160 | ||
282a2fee | 1161 | goto err; |
fce8a7bb JM |
1162 | } |
1163 | ||
1164 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1165 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1166 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1167 | |
282a2fee JM |
1168 | qp->rx_bytes += hdr->len; |
1169 | qp->rx_pkts++; | |
fce8a7bb | 1170 | |
282a2fee | 1171 | if (hdr->len > entry->len) { |
fce8a7bb JM |
1172 | qp->rx_err_oflow++; |
1173 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1174 | "RX overflow! Wanted %d got %d\n", | |
1175 | hdr->len, entry->len); | |
282a2fee JM |
1176 | |
1177 | goto err; | |
fce8a7bb JM |
1178 | } |
1179 | ||
282a2fee JM |
1180 | entry->index = qp->rx_index; |
1181 | entry->rx_hdr = hdr; | |
1182 | ||
1183 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb JM |
1184 | |
1185 | out: | |
282a2fee JM |
1186 | qp->rx_index++; |
1187 | qp->rx_index %= qp->rx_max_entry; | |
1188 | ||
1189 | return 0; | |
1190 | ||
1191 | err: | |
53ca4fea | 1192 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
793c20e9 JM |
1193 | /* Ensure that the data is fully copied out before clearing the flag */ |
1194 | wmb(); | |
1195 | hdr->flags = 0; | |
74465645 | 1196 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1197 | |
282a2fee | 1198 | goto out; |
fce8a7bb JM |
1199 | } |
1200 | ||
e8aeb60c | 1201 | static int ntb_transport_rxc_db(void *data, int db_num) |
fce8a7bb | 1202 | { |
e8aeb60c | 1203 | struct ntb_transport_qp *qp = data; |
c336acd3 | 1204 | int rc, i; |
fce8a7bb | 1205 | |
e8aeb60c JM |
1206 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", |
1207 | __func__, db_num); | |
1208 | ||
c336acd3 JM |
1209 | /* Limit the number of packets processed in a single interrupt to |
1210 | * provide fairness to others | |
1211 | */ | |
1212 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1213 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1214 | if (rc) |
1215 | break; | |
1216 | } | |
282a2fee JM |
1217 | |
1218 | if (qp->dma_chan) | |
1219 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1220 | |
e8aeb60c | 1221 | return i; |
fce8a7bb JM |
1222 | } |
1223 | ||
282a2fee | 1224 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1225 | { |
282a2fee JM |
1226 | struct ntb_queue_entry *entry = data; |
1227 | struct ntb_transport_qp *qp = entry->qp; | |
1228 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1229 | |
282a2fee | 1230 | /* Ensure that the data is fully copied out before setting the flags */ |
842c1dde | 1231 | wmb(); |
74465645 | 1232 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1233 | |
49793889 | 1234 | ntb_ring_doorbell(qp->ndev, qp->qp_num); |
fce8a7bb JM |
1235 | |
1236 | /* The entry length can only be zero if the packet is intended to be a | |
1237 | * "link down" or similar. Since no payload is being sent in these | |
1238 | * cases, there is nothing to add to the completion queue. | |
1239 | */ | |
1240 | if (entry->len > 0) { | |
1241 | qp->tx_bytes += entry->len; | |
1242 | ||
1243 | if (qp->tx_handler) | |
1244 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1245 | entry->len); | |
1246 | } | |
1247 | ||
1248 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1249 | } | |
1250 | ||
282a2fee | 1251 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1252 | { |
282a2fee JM |
1253 | memcpy_toio(offset, entry->buf, entry->len); |
1254 | ||
1255 | ntb_tx_copy_callback(entry); | |
1256 | } | |
1257 | ||
1258 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1259 | struct ntb_queue_entry *entry) | |
1260 | { | |
1261 | struct ntb_payload_header __iomem *hdr; | |
1262 | struct dma_async_tx_descriptor *txd; | |
1263 | struct dma_chan *chan = qp->dma_chan; | |
1264 | struct dma_device *device; | |
1265 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1266 | struct dmaengine_unmap_data *unmap; |
1267 | dma_addr_t dest; | |
282a2fee | 1268 | dma_cookie_t cookie; |
74465645 | 1269 | void __iomem *offset; |
282a2fee JM |
1270 | size_t len = entry->len; |
1271 | void *buf = entry->buf; | |
fce8a7bb | 1272 | |
793c20e9 | 1273 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1274 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1275 | entry->tx_hdr = hdr; | |
fce8a7bb | 1276 | |
282a2fee JM |
1277 | iowrite32(entry->len, &hdr->len); |
1278 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
1279 | ||
1280 | if (!chan) | |
1281 | goto err; | |
1282 | ||
1283 | if (len < copy_bytes) | |
1284 | goto err; | |
1285 | ||
1286 | device = chan->device; | |
1287 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
1288 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1289 | dest_off = (size_t) dest & ~PAGE_MASK; | |
1290 | ||
1291 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1292 | goto err; | |
1293 | ||
6f57fd05 BZ |
1294 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1295 | if (!unmap) | |
282a2fee JM |
1296 | goto err; |
1297 | ||
6f57fd05 BZ |
1298 | unmap->len = len; |
1299 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1300 | buff_off, len, DMA_TO_DEVICE); | |
1301 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1302 | goto err_get_unmap; | |
1303 | ||
1304 | unmap->to_cnt = 1; | |
1305 | ||
6f57fd05 | 1306 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1307 | DMA_PREP_INTERRUPT); |
282a2fee | 1308 | if (!txd) |
6f57fd05 | 1309 | goto err_get_unmap; |
282a2fee JM |
1310 | |
1311 | txd->callback = ntb_tx_copy_callback; | |
1312 | txd->callback_param = entry; | |
6f57fd05 | 1313 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1314 | |
1315 | cookie = dmaengine_submit(txd); | |
1316 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1317 | goto err_set_unmap; |
1318 | ||
1319 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1320 | |
1321 | dma_async_issue_pending(chan); | |
1322 | qp->tx_async++; | |
1323 | ||
1324 | return; | |
6f57fd05 BZ |
1325 | err_set_unmap: |
1326 | dmaengine_unmap_put(unmap); | |
1327 | err_get_unmap: | |
1328 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1329 | err: |
1330 | ntb_memcpy_tx(entry, offset); | |
1331 | qp->tx_memcpy++; | |
1332 | } | |
1333 | ||
1334 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1335 | struct ntb_queue_entry *entry) | |
1336 | { | |
1337 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - tx %u, entry len %d flags %x buff %p\n", | |
1338 | qp->tx_pkts, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1339 | entry->buf); |
793c20e9 | 1340 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1341 | qp->tx_ring_full++; |
1342 | return -EAGAIN; | |
1343 | } | |
1344 | ||
ef114ed5 | 1345 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1346 | if (qp->tx_handler) |
1347 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1348 | ||
1349 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1350 | &qp->tx_free_q); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
282a2fee | 1354 | ntb_async_tx(qp, entry); |
fce8a7bb | 1355 | |
793c20e9 JM |
1356 | qp->tx_index++; |
1357 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1358 | |
1359 | qp->tx_pkts++; | |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1365 | { | |
1366 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1367 | struct ntb_queue_entry *entry; | |
1368 | int i, rc; | |
1369 | ||
1370 | if (qp->qp_link == NTB_LINK_DOWN) | |
1371 | return; | |
1372 | ||
1373 | qp->qp_link = NTB_LINK_DOWN; | |
1374 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1375 | ||
1376 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1377 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1378 | if (entry) |
1379 | break; | |
1380 | msleep(100); | |
1381 | } | |
1382 | ||
1383 | if (!entry) | |
1384 | return; | |
1385 | ||
1386 | entry->cb_data = NULL; | |
1387 | entry->buf = NULL; | |
1388 | entry->len = 0; | |
1389 | entry->flags = LINK_DOWN_FLAG; | |
1390 | ||
1391 | rc = ntb_process_tx(qp, entry); | |
1392 | if (rc) | |
1393 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1394 | qp->qp_num); | |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1399 | * @rx_handler: receive callback function | |
1400 | * @tx_handler: transmit callback function | |
1401 | * @event_handler: event callback function | |
1402 | * | |
1403 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1404 | * routine for both transmit and receive. The receive callback routine will be | |
1405 | * used to pass up data when the transport has received it on the queue. The | |
1406 | * transmit callback routine will be called when the transport has completed the | |
1407 | * transmission of the data on the queue and the data is ready to be freed. | |
1408 | * | |
1409 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1410 | */ | |
1411 | struct ntb_transport_qp * | |
1412 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1413 | const struct ntb_queue_handlers *handlers) | |
1414 | { | |
1415 | struct ntb_queue_entry *entry; | |
1416 | struct ntb_transport_qp *qp; | |
1417 | struct ntb_transport *nt; | |
1418 | unsigned int free_queue; | |
1419 | int rc, i; | |
1420 | ||
1421 | nt = ntb_find_transport(pdev); | |
1422 | if (!nt) | |
1423 | goto err; | |
1424 | ||
1425 | free_queue = ffs(nt->qp_bitmap); | |
1426 | if (!free_queue) | |
1427 | goto err; | |
1428 | ||
1429 | /* decrement free_queue to make it zero based */ | |
1430 | free_queue--; | |
1431 | ||
1432 | clear_bit(free_queue, &nt->qp_bitmap); | |
1433 | ||
1434 | qp = &nt->qps[free_queue]; | |
1435 | qp->cb_data = data; | |
1436 | qp->rx_handler = handlers->rx_handler; | |
1437 | qp->tx_handler = handlers->tx_handler; | |
1438 | qp->event_handler = handlers->event_handler; | |
1439 | ||
94681194 | 1440 | dmaengine_get(); |
282a2fee | 1441 | qp->dma_chan = dma_find_channel(DMA_MEMCPY); |
94681194 JM |
1442 | if (!qp->dma_chan) { |
1443 | dmaengine_put(); | |
282a2fee | 1444 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
94681194 | 1445 | } |
282a2fee | 1446 | |
fce8a7bb JM |
1447 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1448 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1449 | if (!entry) | |
1450 | goto err1; | |
1451 | ||
282a2fee | 1452 | entry->qp = qp; |
fce8a7bb | 1453 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1454 | &qp->rx_free_q); |
fce8a7bb JM |
1455 | } |
1456 | ||
1457 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1458 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1459 | if (!entry) | |
1460 | goto err2; | |
1461 | ||
282a2fee | 1462 | entry->qp = qp; |
fce8a7bb | 1463 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1464 | &qp->tx_free_q); |
fce8a7bb JM |
1465 | } |
1466 | ||
fce8a7bb JM |
1467 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, |
1468 | ntb_transport_rxc_db); | |
1469 | if (rc) | |
e8aeb60c | 1470 | goto err2; |
fce8a7bb JM |
1471 | |
1472 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1473 | ||
1474 | return qp; | |
1475 | ||
fce8a7bb | 1476 | err2: |
f766755c | 1477 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1478 | kfree(entry); |
1479 | err1: | |
f766755c | 1480 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1481 | kfree(entry); |
94681194 JM |
1482 | if (qp->dma_chan) |
1483 | dmaengine_put(); | |
fce8a7bb JM |
1484 | set_bit(free_queue, &nt->qp_bitmap); |
1485 | err: | |
1486 | return NULL; | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1489 | ||
1490 | /** | |
1491 | * ntb_transport_free_queue - Frees NTB transport queue | |
1492 | * @qp: NTB queue to be freed | |
1493 | * | |
1494 | * Frees NTB transport queue | |
1495 | */ | |
1496 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1497 | { | |
186f27ff | 1498 | struct pci_dev *pdev; |
fce8a7bb JM |
1499 | struct ntb_queue_entry *entry; |
1500 | ||
1501 | if (!qp) | |
1502 | return; | |
1503 | ||
186f27ff JM |
1504 | pdev = ntb_query_pdev(qp->ndev); |
1505 | ||
282a2fee JM |
1506 | if (qp->dma_chan) { |
1507 | struct dma_chan *chan = qp->dma_chan; | |
1508 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1509 | * processed by the CPU instead of the DAM engine | |
1510 | */ | |
1511 | qp->dma_chan = NULL; | |
1512 | ||
1513 | /* Try to be nice and wait for any queued DMA engine | |
1514 | * transactions to process before smashing it with a rock | |
1515 | */ | |
1516 | dma_sync_wait(chan, qp->last_cookie); | |
1517 | dmaengine_terminate_all(chan); | |
1518 | dmaengine_put(); | |
1519 | } | |
fce8a7bb JM |
1520 | |
1521 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
fce8a7bb | 1522 | |
282a2fee JM |
1523 | cancel_delayed_work_sync(&qp->link_work); |
1524 | ||
f766755c | 1525 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1526 | kfree(entry); |
1527 | ||
f766755c | 1528 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1529 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1530 | kfree(entry); | |
1531 | } | |
1532 | ||
f766755c | 1533 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1534 | kfree(entry); |
1535 | ||
1536 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1537 | ||
1538 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1539 | } | |
1540 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1541 | ||
1542 | /** | |
1543 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1544 | * @qp: NTB queue to be freed | |
1545 | * @len: pointer to variable to write enqueued buffers length | |
1546 | * | |
1547 | * Dequeues unused buffers from receive queue. Should only be used during | |
1548 | * shutdown of qp. | |
1549 | * | |
1550 | * RETURNS: NULL error value on error, or void* for success. | |
1551 | */ | |
1552 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1553 | { | |
1554 | struct ntb_queue_entry *entry; | |
1555 | void *buf; | |
1556 | ||
1557 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1558 | return NULL; | |
1559 | ||
1560 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1561 | if (!entry) | |
1562 | return NULL; | |
1563 | ||
1564 | buf = entry->cb_data; | |
1565 | *len = entry->len; | |
1566 | ||
f766755c | 1567 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1568 | |
1569 | return buf; | |
1570 | } | |
1571 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1572 | ||
1573 | /** | |
1574 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1575 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1576 | * @cb: per buffer pointer for callback function to use | |
1577 | * @data: pointer to data buffer that incoming packets will be copied into | |
1578 | * @len: length of the data buffer | |
1579 | * | |
1580 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1581 | * payload can be received into. | |
1582 | * | |
1583 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1584 | */ | |
1585 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1586 | unsigned int len) | |
1587 | { | |
1588 | struct ntb_queue_entry *entry; | |
1589 | ||
1590 | if (!qp) | |
1591 | return -EINVAL; | |
1592 | ||
1593 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1594 | if (!entry) | |
1595 | return -ENOMEM; | |
1596 | ||
1597 | entry->cb_data = cb; | |
1598 | entry->buf = data; | |
1599 | entry->len = len; | |
1600 | ||
f766755c | 1601 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1602 | |
1603 | return 0; | |
1604 | } | |
1605 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1606 | ||
1607 | /** | |
1608 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1609 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1610 | * @cb: per buffer pointer for callback function to use | |
1611 | * @data: pointer to data buffer that will be sent | |
1612 | * @len: length of the data buffer | |
1613 | * | |
1614 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1615 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1616 | * serialize access to the qp. |
1617 | * | |
1618 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1619 | */ | |
1620 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1621 | unsigned int len) | |
1622 | { | |
1623 | struct ntb_queue_entry *entry; | |
1624 | int rc; | |
1625 | ||
1626 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1627 | return -EINVAL; | |
1628 | ||
1629 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1630 | if (!entry) { |
1631 | qp->tx_err_no_buf++; | |
fce8a7bb | 1632 | return -ENOMEM; |
282a2fee | 1633 | } |
fce8a7bb JM |
1634 | |
1635 | entry->cb_data = cb; | |
1636 | entry->buf = data; | |
1637 | entry->len = len; | |
1638 | entry->flags = 0; | |
1639 | ||
1640 | rc = ntb_process_tx(qp, entry); | |
1641 | if (rc) | |
1642 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1643 | &qp->tx_free_q); | |
1644 | ||
1645 | return rc; | |
1646 | } | |
1647 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1648 | ||
1649 | /** | |
1650 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1651 | * @qp: NTB transport layer queue to be enabled | |
1652 | * | |
1653 | * Notify NTB transport layer of client readiness to use queue | |
1654 | */ | |
1655 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1656 | { | |
1657 | if (!qp) | |
1658 | return; | |
1659 | ||
1660 | qp->client_ready = NTB_LINK_UP; | |
1661 | ||
1662 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1663 | schedule_delayed_work(&qp->link_work, 0); | |
1664 | } | |
1665 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1666 | ||
1667 | /** | |
1668 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1669 | * @qp: NTB transport layer queue to be disabled | |
1670 | * | |
1671 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1672 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1673 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1674 | */ |
1675 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1676 | { | |
186f27ff | 1677 | struct pci_dev *pdev; |
fce8a7bb JM |
1678 | int rc, val; |
1679 | ||
1680 | if (!qp) | |
1681 | return; | |
1682 | ||
186f27ff | 1683 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1684 | qp->client_ready = NTB_LINK_DOWN; |
1685 | ||
1686 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1687 | if (rc) { | |
1688 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1689 | return; | |
1690 | } | |
1691 | ||
1692 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1693 | val & ~(1 << qp->qp_num)); | |
1694 | if (rc) | |
1695 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1696 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1697 | ||
1698 | if (qp->qp_link == NTB_LINK_UP) | |
1699 | ntb_send_link_down(qp); | |
1700 | else | |
1701 | cancel_delayed_work_sync(&qp->link_work); | |
1702 | } | |
1703 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1704 | ||
1705 | /** | |
1706 | * ntb_transport_link_query - Query transport link state | |
1707 | * @qp: NTB transport layer queue to be queried | |
1708 | * | |
1709 | * Query connectivity to the remote system of the NTB transport queue | |
1710 | * | |
1711 | * RETURNS: true for link up or false for link down | |
1712 | */ | |
1713 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1714 | { | |
186f27ff JM |
1715 | if (!qp) |
1716 | return false; | |
1717 | ||
fce8a7bb JM |
1718 | return qp->qp_link == NTB_LINK_UP; |
1719 | } | |
1720 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1721 | ||
1722 | /** | |
1723 | * ntb_transport_qp_num - Query the qp number | |
1724 | * @qp: NTB transport layer queue to be queried | |
1725 | * | |
1726 | * Query qp number of the NTB transport queue | |
1727 | * | |
1728 | * RETURNS: a zero based number specifying the qp number | |
1729 | */ | |
1730 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1731 | { | |
186f27ff JM |
1732 | if (!qp) |
1733 | return 0; | |
1734 | ||
fce8a7bb JM |
1735 | return qp->qp_num; |
1736 | } | |
1737 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1738 | ||
1739 | /** | |
1740 | * ntb_transport_max_size - Query the max payload size of a qp | |
1741 | * @qp: NTB transport layer queue to be queried | |
1742 | * | |
1743 | * Query the maximum payload size permissible on the given qp | |
1744 | * | |
1745 | * RETURNS: the max payload size of a qp | |
1746 | */ | |
ef114ed5 | 1747 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1748 | { |
282a2fee JM |
1749 | unsigned int max; |
1750 | ||
186f27ff JM |
1751 | if (!qp) |
1752 | return 0; | |
1753 | ||
282a2fee JM |
1754 | if (!qp->dma_chan) |
1755 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1756 | ||
1757 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1758 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1759 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1760 | ||
1761 | return max; | |
fce8a7bb JM |
1762 | } |
1763 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |