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 | |
a1413cfb | 513 | if (nt->max_qps % mw_max && mw_num + 1 < nt->max_qps / mw_max) |
948d3a65 | 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 | ||
3cc5ba19 DJ |
579 | /* |
580 | * we must ensure that the memory address allocated is BAR size | |
581 | * aligned in order for the XLAT register to take the value. This | |
582 | * is a requirement of the hardware. It is recommended to setup CMA | |
583 | * for BAR sizes equal or greater than 4MB. | |
584 | */ | |
585 | if (!IS_ALIGNED(mw->dma_addr, mw->size)) { | |
586 | dev_err(&pdev->dev, "DMA memory %pad not aligned to BAR size\n", | |
587 | &mw->dma_addr); | |
588 | ntb_free_mw(nt, num_mw); | |
589 | return -ENOMEM; | |
590 | } | |
591 | ||
fce8a7bb JM |
592 | /* Notify HW the memory location of the receive buffer */ |
593 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
fca4d518 | 598 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb JM |
599 | { |
600 | struct ntb_transport *nt = qp->transport; | |
601 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
602 | ||
603 | if (qp->qp_link == NTB_LINK_DOWN) { | |
604 | cancel_delayed_work_sync(&qp->link_work); | |
605 | return; | |
606 | } | |
607 | ||
608 | if (qp->event_handler) | |
609 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
610 | ||
611 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
612 | qp->qp_link = NTB_LINK_DOWN; | |
fca4d518 JM |
613 | } |
614 | ||
615 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
616 | { | |
617 | struct ntb_transport_qp *qp = container_of(work, | |
618 | struct ntb_transport_qp, | |
619 | link_cleanup); | |
620 | struct ntb_transport *nt = qp->transport; | |
621 | ||
622 | ntb_qp_link_cleanup(qp); | |
fce8a7bb JM |
623 | |
624 | if (nt->transport_link == NTB_LINK_UP) | |
625 | schedule_delayed_work(&qp->link_work, | |
626 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
627 | } | |
628 | ||
7b4f2d3c JM |
629 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
630 | { | |
631 | schedule_work(&qp->link_cleanup); | |
632 | } | |
633 | ||
fca4d518 | 634 | static void ntb_transport_link_cleanup(struct ntb_transport *nt) |
fce8a7bb JM |
635 | { |
636 | int i; | |
637 | ||
fca4d518 JM |
638 | /* Pass along the info to any clients */ |
639 | for (i = 0; i < nt->max_qps; i++) | |
640 | if (!test_bit(i, &nt->qp_bitmap)) | |
641 | ntb_qp_link_cleanup(&nt->qps[i]); | |
642 | ||
fce8a7bb JM |
643 | if (nt->transport_link == NTB_LINK_DOWN) |
644 | cancel_delayed_work_sync(&nt->link_work); | |
645 | else | |
646 | nt->transport_link = NTB_LINK_DOWN; | |
647 | ||
fce8a7bb JM |
648 | /* The scratchpad registers keep the values if the remote side |
649 | * goes down, blast them now to give them a sane value the next | |
650 | * time they are accessed | |
651 | */ | |
652 | for (i = 0; i < MAX_SPAD; i++) | |
653 | ntb_write_local_spad(nt->ndev, i, 0); | |
654 | } | |
655 | ||
fca4d518 JM |
656 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
657 | { | |
658 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
659 | link_cleanup); | |
660 | ||
661 | ntb_transport_link_cleanup(nt); | |
662 | } | |
663 | ||
fce8a7bb JM |
664 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) |
665 | { | |
666 | struct ntb_transport *nt = data; | |
667 | ||
668 | switch (event) { | |
669 | case NTB_EVENT_HW_LINK_UP: | |
670 | schedule_delayed_work(&nt->link_work, 0); | |
671 | break; | |
672 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 673 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
674 | break; |
675 | default: | |
676 | BUG(); | |
677 | } | |
678 | } | |
679 | ||
680 | static void ntb_transport_link_work(struct work_struct *work) | |
681 | { | |
682 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
683 | link_work.work); | |
684 | struct ntb_device *ndev = nt->ndev; | |
685 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
686 | u32 val; | |
687 | int rc, i; | |
688 | ||
113fc505 | 689 | /* send the local info, in the opposite order of the way we read it */ |
948d3a65 | 690 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 JM |
691 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), |
692 | ntb_get_mw_size(ndev, i) >> 32); | |
693 | if (rc) { | |
694 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
695 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
696 | MW0_SZ_HIGH + (i * 2)); | |
697 | goto out; | |
698 | } | |
fce8a7bb | 699 | |
113fc505 JM |
700 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
701 | (u32) ntb_get_mw_size(ndev, i)); | |
702 | if (rc) { | |
703 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
704 | (u32) ntb_get_mw_size(ndev, i), | |
705 | MW0_SZ_LOW + (i * 2)); | |
706 | goto out; | |
707 | } | |
fce8a7bb JM |
708 | } |
709 | ||
948d3a65 | 710 | rc = ntb_write_remote_spad(ndev, NUM_MWS, ntb_max_mw(ndev)); |
fce8a7bb JM |
711 | if (rc) { |
712 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
948d3a65 | 713 | ntb_max_mw(ndev), NUM_MWS); |
fce8a7bb JM |
714 | goto out; |
715 | } | |
716 | ||
717 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
718 | if (rc) { | |
719 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
720 | nt->max_qps, NUM_QPS); | |
721 | goto out; | |
722 | } | |
723 | ||
113fc505 | 724 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
725 | if (rc) { |
726 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 727 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
728 | goto out; |
729 | } | |
730 | ||
731 | /* Query the remote side for its info */ | |
732 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
733 | if (rc) { | |
734 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
735 | goto out; | |
736 | } | |
737 | ||
738 | if (val != NTB_TRANSPORT_VERSION) | |
739 | goto out; | |
740 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
741 | ||
742 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
743 | if (rc) { | |
744 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
745 | goto out; | |
746 | } | |
747 | ||
748 | if (val != nt->max_qps) | |
749 | goto out; | |
750 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
751 | ||
113fc505 | 752 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 753 | if (rc) { |
113fc505 | 754 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
755 | goto out; |
756 | } | |
757 | ||
948d3a65 | 758 | if (val != ntb_max_mw(ndev)) |
fce8a7bb | 759 | goto out; |
113fc505 | 760 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 761 | |
948d3a65 | 762 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 | 763 | u64 val64; |
fce8a7bb | 764 | |
113fc505 JM |
765 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
766 | if (rc) { | |
767 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
768 | MW0_SZ_HIGH + (i * 2)); | |
769 | goto out1; | |
770 | } | |
fce8a7bb | 771 | |
113fc505 | 772 | val64 = (u64) val << 32; |
fce8a7bb | 773 | |
113fc505 JM |
774 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
775 | if (rc) { | |
776 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
777 | MW0_SZ_LOW + (i * 2)); | |
778 | goto out1; | |
779 | } | |
780 | ||
781 | val64 |= val; | |
782 | ||
783 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
784 | ||
785 | rc = ntb_set_mw(nt, i, val64); | |
786 | if (rc) | |
787 | goto out1; | |
788 | } | |
fce8a7bb JM |
789 | |
790 | nt->transport_link = NTB_LINK_UP; | |
791 | ||
792 | for (i = 0; i < nt->max_qps; i++) { | |
793 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
794 | ||
795 | ntb_transport_setup_qp_mw(nt, i); | |
796 | ||
797 | if (qp->client_ready == NTB_LINK_UP) | |
798 | schedule_delayed_work(&qp->link_work, 0); | |
799 | } | |
800 | ||
801 | return; | |
802 | ||
113fc505 | 803 | out1: |
948d3a65 | 804 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 805 | ntb_free_mw(nt, i); |
fce8a7bb JM |
806 | out: |
807 | if (ntb_hw_link_status(ndev)) | |
808 | schedule_delayed_work(&nt->link_work, | |
809 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
810 | } | |
811 | ||
812 | static void ntb_qp_link_work(struct work_struct *work) | |
813 | { | |
814 | struct ntb_transport_qp *qp = container_of(work, | |
815 | struct ntb_transport_qp, | |
816 | link_work.work); | |
817 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
818 | struct ntb_transport *nt = qp->transport; | |
819 | int rc, val; | |
820 | ||
821 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
822 | ||
823 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
824 | if (rc) { | |
825 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
826 | return; | |
827 | } | |
828 | ||
829 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
830 | if (rc) | |
831 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
832 | val | 1 << qp->qp_num, QP_LINKS); | |
833 | ||
834 | /* query remote spad for qp ready bits */ | |
835 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
836 | if (rc) | |
837 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
838 | ||
839 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
840 | ||
841 | /* See if the remote side is up */ | |
842 | if (1 << qp->qp_num & val) { | |
843 | qp->qp_link = NTB_LINK_UP; | |
844 | ||
845 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
846 | if (qp->event_handler) | |
847 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
848 | } else if (nt->transport_link == NTB_LINK_UP) | |
849 | schedule_delayed_work(&qp->link_work, | |
850 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
851 | } | |
852 | ||
282a2fee | 853 | static int ntb_transport_init_queue(struct ntb_transport *nt, |
53ca4fea | 854 | unsigned int qp_num) |
fce8a7bb JM |
855 | { |
856 | struct ntb_transport_qp *qp; | |
ef114ed5 | 857 | unsigned int num_qps_mw, tx_size; |
948d3a65 | 858 | u8 mw_num, mw_max; |
282a2fee | 859 | u64 qp_offset; |
948d3a65 JM |
860 | |
861 | mw_max = ntb_max_mw(nt->ndev); | |
862 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
fce8a7bb JM |
863 | |
864 | qp = &nt->qps[qp_num]; | |
865 | qp->qp_num = qp_num; | |
866 | qp->transport = nt; | |
867 | qp->ndev = nt->ndev; | |
868 | qp->qp_link = NTB_LINK_DOWN; | |
869 | qp->client_ready = NTB_LINK_DOWN; | |
870 | qp->event_handler = NULL; | |
871 | ||
a1413cfb | 872 | if (nt->max_qps % mw_max && mw_num + 1 < nt->max_qps / mw_max) |
948d3a65 | 873 | num_qps_mw = nt->max_qps / mw_max + 1; |
ef114ed5 | 874 | else |
948d3a65 | 875 | num_qps_mw = nt->max_qps / mw_max; |
ef114ed5 | 876 | |
793c20e9 | 877 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
282a2fee JM |
878 | qp_offset = qp_num / mw_max * tx_size; |
879 | qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset; | |
880 | if (!qp->tx_mw) | |
881 | return -EINVAL; | |
882 | ||
883 | qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset; | |
884 | if (!qp->tx_mw_phys) | |
885 | return -EINVAL; | |
886 | ||
793c20e9 | 887 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 888 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 889 | |
c9d534c8 JM |
890 | /* Due to housekeeping, there must be atleast 2 buffs */ |
891 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 892 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 893 | |
1517a3f2 | 894 | if (ntb_query_debugfs(nt->ndev)) { |
fce8a7bb JM |
895 | char debugfs_name[4]; |
896 | ||
897 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
898 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
1517a3f2 | 899 | ntb_query_debugfs(nt->ndev)); |
fce8a7bb JM |
900 | |
901 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
902 | qp->debugfs_dir, qp, | |
903 | &ntb_qp_debugfs_stats); | |
904 | } | |
905 | ||
906 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 907 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
908 | |
909 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
910 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
911 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
912 | ||
913 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
914 | INIT_LIST_HEAD(&qp->rx_free_q); | |
915 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee JM |
916 | |
917 | return 0; | |
fce8a7bb JM |
918 | } |
919 | ||
920 | int ntb_transport_init(struct pci_dev *pdev) | |
921 | { | |
922 | struct ntb_transport *nt; | |
923 | int rc, i; | |
924 | ||
925 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
926 | if (!nt) | |
927 | return -ENOMEM; | |
928 | ||
fce8a7bb JM |
929 | nt->ndev = ntb_register_transport(pdev, nt); |
930 | if (!nt->ndev) { | |
931 | rc = -EIO; | |
932 | goto err; | |
933 | } | |
934 | ||
948d3a65 JM |
935 | nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw), |
936 | GFP_KERNEL); | |
937 | if (!nt->mw) { | |
938 | rc = -ENOMEM; | |
939 | goto err1; | |
940 | } | |
941 | ||
942 | if (max_num_clients) | |
943 | nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients); | |
944 | else | |
945 | nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev)); | |
fce8a7bb JM |
946 | |
947 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
948 | GFP_KERNEL); | |
949 | if (!nt->qps) { | |
950 | rc = -ENOMEM; | |
948d3a65 | 951 | goto err2; |
fce8a7bb JM |
952 | } |
953 | ||
954 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
955 | ||
282a2fee JM |
956 | for (i = 0; i < nt->max_qps; i++) { |
957 | rc = ntb_transport_init_queue(nt, i); | |
958 | if (rc) | |
959 | goto err3; | |
960 | } | |
fce8a7bb JM |
961 | |
962 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 963 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb JM |
964 | |
965 | rc = ntb_register_event_callback(nt->ndev, | |
966 | ntb_transport_event_callback); | |
967 | if (rc) | |
948d3a65 | 968 | goto err3; |
fce8a7bb JM |
969 | |
970 | INIT_LIST_HEAD(&nt->client_devs); | |
971 | rc = ntb_bus_init(nt); | |
972 | if (rc) | |
948d3a65 | 973 | goto err4; |
fce8a7bb JM |
974 | |
975 | if (ntb_hw_link_status(nt->ndev)) | |
976 | schedule_delayed_work(&nt->link_work, 0); | |
977 | ||
978 | return 0; | |
979 | ||
948d3a65 | 980 | err4: |
fce8a7bb | 981 | ntb_unregister_event_callback(nt->ndev); |
948d3a65 | 982 | err3: |
fce8a7bb | 983 | kfree(nt->qps); |
948d3a65 JM |
984 | err2: |
985 | kfree(nt->mw); | |
fce8a7bb JM |
986 | err1: |
987 | ntb_unregister_transport(nt->ndev); | |
988 | err: | |
fce8a7bb JM |
989 | kfree(nt); |
990 | return rc; | |
991 | } | |
992 | ||
993 | void ntb_transport_free(void *transport) | |
994 | { | |
995 | struct ntb_transport *nt = transport; | |
948d3a65 | 996 | struct ntb_device *ndev = nt->ndev; |
fce8a7bb JM |
997 | int i; |
998 | ||
fca4d518 | 999 | ntb_transport_link_cleanup(nt); |
fce8a7bb JM |
1000 | |
1001 | /* verify that all the qp's are freed */ | |
1517a3f2 | 1002 | for (i = 0; i < nt->max_qps; i++) { |
fce8a7bb JM |
1003 | if (!test_bit(i, &nt->qp_bitmap)) |
1004 | ntb_transport_free_queue(&nt->qps[i]); | |
1517a3f2 JM |
1005 | debugfs_remove_recursive(nt->qps[i].debugfs_dir); |
1006 | } | |
fce8a7bb JM |
1007 | |
1008 | ntb_bus_remove(nt); | |
1009 | ||
1010 | cancel_delayed_work_sync(&nt->link_work); | |
1011 | ||
948d3a65 | 1012 | ntb_unregister_event_callback(ndev); |
fce8a7bb | 1013 | |
948d3a65 | 1014 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 1015 | ntb_free_mw(nt, i); |
fce8a7bb JM |
1016 | |
1017 | kfree(nt->qps); | |
948d3a65 JM |
1018 | kfree(nt->mw); |
1019 | ntb_unregister_transport(ndev); | |
fce8a7bb JM |
1020 | kfree(nt); |
1021 | } | |
1022 | ||
282a2fee | 1023 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1024 | { |
282a2fee JM |
1025 | struct ntb_queue_entry *entry = data; |
1026 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1027 | void *cb_data = entry->cb_data; |
1028 | unsigned int len = entry->len; | |
282a2fee JM |
1029 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1030 | ||
1031 | /* Ensure that the data is fully copied out before clearing the flag */ | |
1032 | wmb(); | |
1033 | hdr->flags = 0; | |
fce8a7bb | 1034 | |
282a2fee | 1035 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1036 | |
1037 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
1038 | |
1039 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
1040 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
1041 | } |
1042 | ||
282a2fee JM |
1043 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1044 | { | |
1045 | void *buf = entry->buf; | |
1046 | size_t len = entry->len; | |
1047 | ||
1048 | memcpy(buf, offset, len); | |
1049 | ||
1050 | ntb_rx_copy_callback(entry); | |
1051 | } | |
1052 | ||
1053 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1054 | size_t len) | |
1055 | { | |
1056 | struct dma_async_tx_descriptor *txd; | |
1057 | struct ntb_transport_qp *qp = entry->qp; | |
1058 | struct dma_chan *chan = qp->dma_chan; | |
1059 | struct dma_device *device; | |
1060 | size_t pay_off, buff_off; | |
6f57fd05 | 1061 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1062 | dma_cookie_t cookie; |
1063 | void *buf = entry->buf; | |
282a2fee JM |
1064 | |
1065 | entry->len = len; | |
1066 | ||
1067 | if (!chan) | |
1068 | goto err; | |
1069 | ||
53ca4fea | 1070 | if (len < copy_bytes) |
6f57fd05 | 1071 | goto err_wait; |
282a2fee JM |
1072 | |
1073 | device = chan->device; | |
1074 | pay_off = (size_t) offset & ~PAGE_MASK; | |
1075 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1076 | ||
1077 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1078 | goto err_wait; |
282a2fee | 1079 | |
6f57fd05 BZ |
1080 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1081 | if (!unmap) | |
1082 | goto err_wait; | |
282a2fee | 1083 | |
6f57fd05 BZ |
1084 | unmap->len = len; |
1085 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1086 | pay_off, len, DMA_TO_DEVICE); | |
1087 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1088 | goto err_get_unmap; | |
1089 | ||
1090 | unmap->to_cnt = 1; | |
282a2fee | 1091 | |
6f57fd05 BZ |
1092 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1093 | buff_off, len, DMA_FROM_DEVICE); | |
1094 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1095 | goto err_get_unmap; | |
1096 | ||
1097 | unmap->from_cnt = 1; | |
1098 | ||
6f57fd05 | 1099 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1100 | unmap->addr[0], len, |
1101 | DMA_PREP_INTERRUPT); | |
282a2fee | 1102 | if (!txd) |
6f57fd05 | 1103 | goto err_get_unmap; |
282a2fee JM |
1104 | |
1105 | txd->callback = ntb_rx_copy_callback; | |
1106 | txd->callback_param = entry; | |
6f57fd05 | 1107 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1108 | |
1109 | cookie = dmaengine_submit(txd); | |
1110 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1111 | goto err_set_unmap; |
1112 | ||
1113 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1114 | |
1115 | qp->last_cookie = cookie; | |
1116 | ||
1117 | qp->rx_async++; | |
1118 | ||
1119 | return; | |
1120 | ||
6f57fd05 BZ |
1121 | err_set_unmap: |
1122 | dmaengine_unmap_put(unmap); | |
1123 | err_get_unmap: | |
1124 | dmaengine_unmap_put(unmap); | |
1125 | err_wait: | |
282a2fee JM |
1126 | /* If the callbacks come out of order, the writing of the index to the |
1127 | * last completed will be out of order. This may result in the | |
1128 | * receive stalling forever. | |
1129 | */ | |
1130 | dma_sync_wait(chan, qp->last_cookie); | |
1131 | err: | |
1132 | ntb_memcpy_rx(entry, offset); | |
1133 | qp->rx_memcpy++; | |
1134 | } | |
1135 | ||
fce8a7bb JM |
1136 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1137 | { | |
1138 | struct ntb_payload_header *hdr; | |
1139 | struct ntb_queue_entry *entry; | |
1140 | void *offset; | |
1141 | ||
793c20e9 JM |
1142 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1143 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1144 | ||
fce8a7bb JM |
1145 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1146 | if (!entry) { | |
fce8a7bb | 1147 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1148 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
1149 | hdr->ver, hdr->len, hdr->flags); |
1150 | qp->rx_err_no_buf++; | |
1151 | return -ENOMEM; | |
1152 | } | |
1153 | ||
fce8a7bb JM |
1154 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
1155 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1156 | &qp->rx_pend_q); |
fce8a7bb JM |
1157 | qp->rx_ring_empty++; |
1158 | return -EAGAIN; | |
1159 | } | |
1160 | ||
74465645 | 1161 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 1162 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1163 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
1164 | qp->qp_num, qp->rx_pkts, hdr->ver); |
1165 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1166 | &qp->rx_pend_q); |
fce8a7bb JM |
1167 | qp->rx_err_ver++; |
1168 | return -EIO; | |
1169 | } | |
1170 | ||
1171 | if (hdr->flags & LINK_DOWN_FLAG) { | |
1172 | ntb_qp_link_down(qp); | |
1173 | ||
282a2fee | 1174 | goto err; |
fce8a7bb JM |
1175 | } |
1176 | ||
1177 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1178 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1179 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1180 | |
282a2fee JM |
1181 | qp->rx_bytes += hdr->len; |
1182 | qp->rx_pkts++; | |
fce8a7bb | 1183 | |
282a2fee | 1184 | if (hdr->len > entry->len) { |
fce8a7bb JM |
1185 | qp->rx_err_oflow++; |
1186 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1187 | "RX overflow! Wanted %d got %d\n", | |
1188 | hdr->len, entry->len); | |
282a2fee JM |
1189 | |
1190 | goto err; | |
fce8a7bb JM |
1191 | } |
1192 | ||
282a2fee JM |
1193 | entry->index = qp->rx_index; |
1194 | entry->rx_hdr = hdr; | |
1195 | ||
1196 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb JM |
1197 | |
1198 | out: | |
282a2fee JM |
1199 | qp->rx_index++; |
1200 | qp->rx_index %= qp->rx_max_entry; | |
1201 | ||
1202 | return 0; | |
1203 | ||
1204 | err: | |
53ca4fea | 1205 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
793c20e9 JM |
1206 | /* Ensure that the data is fully copied out before clearing the flag */ |
1207 | wmb(); | |
1208 | hdr->flags = 0; | |
74465645 | 1209 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1210 | |
282a2fee | 1211 | goto out; |
fce8a7bb JM |
1212 | } |
1213 | ||
e8aeb60c | 1214 | static int ntb_transport_rxc_db(void *data, int db_num) |
fce8a7bb | 1215 | { |
e8aeb60c | 1216 | struct ntb_transport_qp *qp = data; |
c336acd3 | 1217 | int rc, i; |
fce8a7bb | 1218 | |
e8aeb60c JM |
1219 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", |
1220 | __func__, db_num); | |
1221 | ||
c336acd3 JM |
1222 | /* Limit the number of packets processed in a single interrupt to |
1223 | * provide fairness to others | |
1224 | */ | |
1225 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1226 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1227 | if (rc) |
1228 | break; | |
1229 | } | |
282a2fee JM |
1230 | |
1231 | if (qp->dma_chan) | |
1232 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1233 | |
e8aeb60c | 1234 | return i; |
fce8a7bb JM |
1235 | } |
1236 | ||
282a2fee | 1237 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1238 | { |
282a2fee JM |
1239 | struct ntb_queue_entry *entry = data; |
1240 | struct ntb_transport_qp *qp = entry->qp; | |
1241 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1242 | |
282a2fee | 1243 | /* Ensure that the data is fully copied out before setting the flags */ |
842c1dde | 1244 | wmb(); |
74465645 | 1245 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1246 | |
49793889 | 1247 | ntb_ring_doorbell(qp->ndev, qp->qp_num); |
fce8a7bb JM |
1248 | |
1249 | /* The entry length can only be zero if the packet is intended to be a | |
1250 | * "link down" or similar. Since no payload is being sent in these | |
1251 | * cases, there is nothing to add to the completion queue. | |
1252 | */ | |
1253 | if (entry->len > 0) { | |
1254 | qp->tx_bytes += entry->len; | |
1255 | ||
1256 | if (qp->tx_handler) | |
1257 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1258 | entry->len); | |
1259 | } | |
1260 | ||
1261 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1262 | } | |
1263 | ||
282a2fee | 1264 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1265 | { |
282a2fee JM |
1266 | memcpy_toio(offset, entry->buf, entry->len); |
1267 | ||
1268 | ntb_tx_copy_callback(entry); | |
1269 | } | |
1270 | ||
1271 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1272 | struct ntb_queue_entry *entry) | |
1273 | { | |
1274 | struct ntb_payload_header __iomem *hdr; | |
1275 | struct dma_async_tx_descriptor *txd; | |
1276 | struct dma_chan *chan = qp->dma_chan; | |
1277 | struct dma_device *device; | |
1278 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1279 | struct dmaengine_unmap_data *unmap; |
1280 | dma_addr_t dest; | |
282a2fee | 1281 | dma_cookie_t cookie; |
74465645 | 1282 | void __iomem *offset; |
282a2fee JM |
1283 | size_t len = entry->len; |
1284 | void *buf = entry->buf; | |
fce8a7bb | 1285 | |
793c20e9 | 1286 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1287 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1288 | entry->tx_hdr = hdr; | |
fce8a7bb | 1289 | |
282a2fee JM |
1290 | iowrite32(entry->len, &hdr->len); |
1291 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
1292 | ||
1293 | if (!chan) | |
1294 | goto err; | |
1295 | ||
1296 | if (len < copy_bytes) | |
1297 | goto err; | |
1298 | ||
1299 | device = chan->device; | |
1300 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
1301 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1302 | dest_off = (size_t) dest & ~PAGE_MASK; | |
1303 | ||
1304 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1305 | goto err; | |
1306 | ||
6f57fd05 BZ |
1307 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1308 | if (!unmap) | |
282a2fee JM |
1309 | goto err; |
1310 | ||
6f57fd05 BZ |
1311 | unmap->len = len; |
1312 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1313 | buff_off, len, DMA_TO_DEVICE); | |
1314 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1315 | goto err_get_unmap; | |
1316 | ||
1317 | unmap->to_cnt = 1; | |
1318 | ||
6f57fd05 | 1319 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1320 | DMA_PREP_INTERRUPT); |
282a2fee | 1321 | if (!txd) |
6f57fd05 | 1322 | goto err_get_unmap; |
282a2fee JM |
1323 | |
1324 | txd->callback = ntb_tx_copy_callback; | |
1325 | txd->callback_param = entry; | |
6f57fd05 | 1326 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1327 | |
1328 | cookie = dmaengine_submit(txd); | |
1329 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1330 | goto err_set_unmap; |
1331 | ||
1332 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1333 | |
1334 | dma_async_issue_pending(chan); | |
1335 | qp->tx_async++; | |
1336 | ||
1337 | return; | |
6f57fd05 BZ |
1338 | err_set_unmap: |
1339 | dmaengine_unmap_put(unmap); | |
1340 | err_get_unmap: | |
1341 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1342 | err: |
1343 | ntb_memcpy_tx(entry, offset); | |
1344 | qp->tx_memcpy++; | |
1345 | } | |
1346 | ||
1347 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1348 | struct ntb_queue_entry *entry) | |
1349 | { | |
1350 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - tx %u, entry len %d flags %x buff %p\n", | |
1351 | qp->tx_pkts, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1352 | entry->buf); |
793c20e9 | 1353 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1354 | qp->tx_ring_full++; |
1355 | return -EAGAIN; | |
1356 | } | |
1357 | ||
ef114ed5 | 1358 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1359 | if (qp->tx_handler) |
1360 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1361 | ||
1362 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1363 | &qp->tx_free_q); | |
1364 | return 0; | |
1365 | } | |
1366 | ||
282a2fee | 1367 | ntb_async_tx(qp, entry); |
fce8a7bb | 1368 | |
793c20e9 JM |
1369 | qp->tx_index++; |
1370 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1371 | |
1372 | qp->tx_pkts++; | |
1373 | ||
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1378 | { | |
1379 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1380 | struct ntb_queue_entry *entry; | |
1381 | int i, rc; | |
1382 | ||
1383 | if (qp->qp_link == NTB_LINK_DOWN) | |
1384 | return; | |
1385 | ||
1386 | qp->qp_link = NTB_LINK_DOWN; | |
1387 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1388 | ||
1389 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1390 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1391 | if (entry) |
1392 | break; | |
1393 | msleep(100); | |
1394 | } | |
1395 | ||
1396 | if (!entry) | |
1397 | return; | |
1398 | ||
1399 | entry->cb_data = NULL; | |
1400 | entry->buf = NULL; | |
1401 | entry->len = 0; | |
1402 | entry->flags = LINK_DOWN_FLAG; | |
1403 | ||
1404 | rc = ntb_process_tx(qp, entry); | |
1405 | if (rc) | |
1406 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1407 | qp->qp_num); | |
1408 | } | |
1409 | ||
1410 | /** | |
1411 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1412 | * @rx_handler: receive callback function | |
1413 | * @tx_handler: transmit callback function | |
1414 | * @event_handler: event callback function | |
1415 | * | |
1416 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1417 | * routine for both transmit and receive. The receive callback routine will be | |
1418 | * used to pass up data when the transport has received it on the queue. The | |
1419 | * transmit callback routine will be called when the transport has completed the | |
1420 | * transmission of the data on the queue and the data is ready to be freed. | |
1421 | * | |
1422 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1423 | */ | |
1424 | struct ntb_transport_qp * | |
1425 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1426 | const struct ntb_queue_handlers *handlers) | |
1427 | { | |
1428 | struct ntb_queue_entry *entry; | |
1429 | struct ntb_transport_qp *qp; | |
1430 | struct ntb_transport *nt; | |
1431 | unsigned int free_queue; | |
1432 | int rc, i; | |
1433 | ||
1434 | nt = ntb_find_transport(pdev); | |
1435 | if (!nt) | |
1436 | goto err; | |
1437 | ||
1438 | free_queue = ffs(nt->qp_bitmap); | |
1439 | if (!free_queue) | |
1440 | goto err; | |
1441 | ||
1442 | /* decrement free_queue to make it zero based */ | |
1443 | free_queue--; | |
1444 | ||
1445 | clear_bit(free_queue, &nt->qp_bitmap); | |
1446 | ||
1447 | qp = &nt->qps[free_queue]; | |
1448 | qp->cb_data = data; | |
1449 | qp->rx_handler = handlers->rx_handler; | |
1450 | qp->tx_handler = handlers->tx_handler; | |
1451 | qp->event_handler = handlers->event_handler; | |
1452 | ||
94681194 | 1453 | dmaengine_get(); |
282a2fee | 1454 | qp->dma_chan = dma_find_channel(DMA_MEMCPY); |
94681194 JM |
1455 | if (!qp->dma_chan) { |
1456 | dmaengine_put(); | |
282a2fee | 1457 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
94681194 | 1458 | } |
282a2fee | 1459 | |
fce8a7bb JM |
1460 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1461 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1462 | if (!entry) | |
1463 | goto err1; | |
1464 | ||
282a2fee | 1465 | entry->qp = qp; |
fce8a7bb | 1466 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1467 | &qp->rx_free_q); |
fce8a7bb JM |
1468 | } |
1469 | ||
1470 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1471 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1472 | if (!entry) | |
1473 | goto err2; | |
1474 | ||
282a2fee | 1475 | entry->qp = qp; |
fce8a7bb | 1476 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1477 | &qp->tx_free_q); |
fce8a7bb JM |
1478 | } |
1479 | ||
fce8a7bb JM |
1480 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, |
1481 | ntb_transport_rxc_db); | |
1482 | if (rc) | |
e8aeb60c | 1483 | goto err2; |
fce8a7bb JM |
1484 | |
1485 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1486 | ||
1487 | return qp; | |
1488 | ||
fce8a7bb | 1489 | err2: |
f766755c | 1490 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1491 | kfree(entry); |
1492 | err1: | |
f766755c | 1493 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1494 | kfree(entry); |
94681194 JM |
1495 | if (qp->dma_chan) |
1496 | dmaengine_put(); | |
fce8a7bb JM |
1497 | set_bit(free_queue, &nt->qp_bitmap); |
1498 | err: | |
1499 | return NULL; | |
1500 | } | |
1501 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1502 | ||
1503 | /** | |
1504 | * ntb_transport_free_queue - Frees NTB transport queue | |
1505 | * @qp: NTB queue to be freed | |
1506 | * | |
1507 | * Frees NTB transport queue | |
1508 | */ | |
1509 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1510 | { | |
186f27ff | 1511 | struct pci_dev *pdev; |
fce8a7bb JM |
1512 | struct ntb_queue_entry *entry; |
1513 | ||
1514 | if (!qp) | |
1515 | return; | |
1516 | ||
186f27ff JM |
1517 | pdev = ntb_query_pdev(qp->ndev); |
1518 | ||
282a2fee JM |
1519 | if (qp->dma_chan) { |
1520 | struct dma_chan *chan = qp->dma_chan; | |
1521 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1522 | * processed by the CPU instead of the DAM engine | |
1523 | */ | |
1524 | qp->dma_chan = NULL; | |
1525 | ||
1526 | /* Try to be nice and wait for any queued DMA engine | |
1527 | * transactions to process before smashing it with a rock | |
1528 | */ | |
1529 | dma_sync_wait(chan, qp->last_cookie); | |
1530 | dmaengine_terminate_all(chan); | |
1531 | dmaengine_put(); | |
1532 | } | |
fce8a7bb JM |
1533 | |
1534 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
fce8a7bb | 1535 | |
282a2fee JM |
1536 | cancel_delayed_work_sync(&qp->link_work); |
1537 | ||
f766755c | 1538 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1539 | kfree(entry); |
1540 | ||
f766755c | 1541 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1542 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1543 | kfree(entry); | |
1544 | } | |
1545 | ||
f766755c | 1546 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1547 | kfree(entry); |
1548 | ||
1549 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1550 | ||
1551 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1552 | } | |
1553 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1554 | ||
1555 | /** | |
1556 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1557 | * @qp: NTB queue to be freed | |
1558 | * @len: pointer to variable to write enqueued buffers length | |
1559 | * | |
1560 | * Dequeues unused buffers from receive queue. Should only be used during | |
1561 | * shutdown of qp. | |
1562 | * | |
1563 | * RETURNS: NULL error value on error, or void* for success. | |
1564 | */ | |
1565 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1566 | { | |
1567 | struct ntb_queue_entry *entry; | |
1568 | void *buf; | |
1569 | ||
1570 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1571 | return NULL; | |
1572 | ||
1573 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1574 | if (!entry) | |
1575 | return NULL; | |
1576 | ||
1577 | buf = entry->cb_data; | |
1578 | *len = entry->len; | |
1579 | ||
f766755c | 1580 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1581 | |
1582 | return buf; | |
1583 | } | |
1584 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1585 | ||
1586 | /** | |
1587 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1588 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1589 | * @cb: per buffer pointer for callback function to use | |
1590 | * @data: pointer to data buffer that incoming packets will be copied into | |
1591 | * @len: length of the data buffer | |
1592 | * | |
1593 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1594 | * payload can be received into. | |
1595 | * | |
1596 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1597 | */ | |
1598 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1599 | unsigned int len) | |
1600 | { | |
1601 | struct ntb_queue_entry *entry; | |
1602 | ||
1603 | if (!qp) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1607 | if (!entry) | |
1608 | return -ENOMEM; | |
1609 | ||
1610 | entry->cb_data = cb; | |
1611 | entry->buf = data; | |
1612 | entry->len = len; | |
1613 | ||
f766755c | 1614 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1615 | |
1616 | return 0; | |
1617 | } | |
1618 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1619 | ||
1620 | /** | |
1621 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1622 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1623 | * @cb: per buffer pointer for callback function to use | |
1624 | * @data: pointer to data buffer that will be sent | |
1625 | * @len: length of the data buffer | |
1626 | * | |
1627 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1628 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1629 | * serialize access to the qp. |
1630 | * | |
1631 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1632 | */ | |
1633 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1634 | unsigned int len) | |
1635 | { | |
1636 | struct ntb_queue_entry *entry; | |
1637 | int rc; | |
1638 | ||
1639 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1640 | return -EINVAL; | |
1641 | ||
1642 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1643 | if (!entry) { |
1644 | qp->tx_err_no_buf++; | |
fce8a7bb | 1645 | return -ENOMEM; |
282a2fee | 1646 | } |
fce8a7bb JM |
1647 | |
1648 | entry->cb_data = cb; | |
1649 | entry->buf = data; | |
1650 | entry->len = len; | |
1651 | entry->flags = 0; | |
1652 | ||
1653 | rc = ntb_process_tx(qp, entry); | |
1654 | if (rc) | |
1655 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1656 | &qp->tx_free_q); | |
1657 | ||
1658 | return rc; | |
1659 | } | |
1660 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1661 | ||
1662 | /** | |
1663 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1664 | * @qp: NTB transport layer queue to be enabled | |
1665 | * | |
1666 | * Notify NTB transport layer of client readiness to use queue | |
1667 | */ | |
1668 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1669 | { | |
1670 | if (!qp) | |
1671 | return; | |
1672 | ||
1673 | qp->client_ready = NTB_LINK_UP; | |
1674 | ||
1675 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1676 | schedule_delayed_work(&qp->link_work, 0); | |
1677 | } | |
1678 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1679 | ||
1680 | /** | |
1681 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1682 | * @qp: NTB transport layer queue to be disabled | |
1683 | * | |
1684 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1685 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1686 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1687 | */ |
1688 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1689 | { | |
186f27ff | 1690 | struct pci_dev *pdev; |
fce8a7bb JM |
1691 | int rc, val; |
1692 | ||
1693 | if (!qp) | |
1694 | return; | |
1695 | ||
186f27ff | 1696 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1697 | qp->client_ready = NTB_LINK_DOWN; |
1698 | ||
1699 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1700 | if (rc) { | |
1701 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1702 | return; | |
1703 | } | |
1704 | ||
1705 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1706 | val & ~(1 << qp->qp_num)); | |
1707 | if (rc) | |
1708 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1709 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1710 | ||
1711 | if (qp->qp_link == NTB_LINK_UP) | |
1712 | ntb_send_link_down(qp); | |
1713 | else | |
1714 | cancel_delayed_work_sync(&qp->link_work); | |
1715 | } | |
1716 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1717 | ||
1718 | /** | |
1719 | * ntb_transport_link_query - Query transport link state | |
1720 | * @qp: NTB transport layer queue to be queried | |
1721 | * | |
1722 | * Query connectivity to the remote system of the NTB transport queue | |
1723 | * | |
1724 | * RETURNS: true for link up or false for link down | |
1725 | */ | |
1726 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1727 | { | |
186f27ff JM |
1728 | if (!qp) |
1729 | return false; | |
1730 | ||
fce8a7bb JM |
1731 | return qp->qp_link == NTB_LINK_UP; |
1732 | } | |
1733 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1734 | ||
1735 | /** | |
1736 | * ntb_transport_qp_num - Query the qp number | |
1737 | * @qp: NTB transport layer queue to be queried | |
1738 | * | |
1739 | * Query qp number of the NTB transport queue | |
1740 | * | |
1741 | * RETURNS: a zero based number specifying the qp number | |
1742 | */ | |
1743 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1744 | { | |
186f27ff JM |
1745 | if (!qp) |
1746 | return 0; | |
1747 | ||
fce8a7bb JM |
1748 | return qp->qp_num; |
1749 | } | |
1750 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1751 | ||
1752 | /** | |
1753 | * ntb_transport_max_size - Query the max payload size of a qp | |
1754 | * @qp: NTB transport layer queue to be queried | |
1755 | * | |
1756 | * Query the maximum payload size permissible on the given qp | |
1757 | * | |
1758 | * RETURNS: the max payload size of a qp | |
1759 | */ | |
ef114ed5 | 1760 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1761 | { |
282a2fee JM |
1762 | unsigned int max; |
1763 | ||
186f27ff JM |
1764 | if (!qp) |
1765 | return 0; | |
1766 | ||
282a2fee JM |
1767 | if (!qp->dma_chan) |
1768 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1769 | ||
1770 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1771 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1772 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1773 | ||
1774 | return max; | |
fce8a7bb JM |
1775 | } |
1776 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |