Commit | Line | Data |
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fce8a7bb JM |
1 | /* |
2 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
3 | * redistributing this file, you may do so under either license. | |
4 | * | |
5 | * GPL LICENSE SUMMARY | |
6 | * | |
7 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * BSD LICENSE | |
14 | * | |
15 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * | |
21 | * * Redistributions of source code must retain the above copyright | |
22 | * notice, this list of conditions and the following disclaimer. | |
23 | * * Redistributions in binary form must reproduce the above copy | |
24 | * notice, this list of conditions and the following disclaimer in | |
25 | * the documentation and/or other materials provided with the | |
26 | * distribution. | |
27 | * * Neither the name of Intel Corporation nor the names of its | |
28 | * contributors may be used to endorse or promote products derived | |
29 | * from this software without specific prior written permission. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
36 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
37 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
38 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
39 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
40 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
41 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
42 | * | |
43 | * Intel PCIe NTB Linux driver | |
44 | * | |
45 | * Contact Information: | |
46 | * Jon Mason <jon.mason@intel.com> | |
47 | */ | |
48 | #include <linux/debugfs.h> | |
49 | #include <linux/delay.h> | |
282a2fee | 50 | #include <linux/dmaengine.h> |
fce8a7bb JM |
51 | #include <linux/dma-mapping.h> |
52 | #include <linux/errno.h> | |
53 | #include <linux/export.h> | |
54 | #include <linux/interrupt.h> | |
55 | #include <linux/module.h> | |
56 | #include <linux/pci.h> | |
57 | #include <linux/slab.h> | |
58 | #include <linux/types.h> | |
59 | #include <linux/ntb.h> | |
60 | #include "ntb_hw.h" | |
61 | ||
113fc505 | 62 | #define NTB_TRANSPORT_VERSION 3 |
fce8a7bb | 63 | |
ef114ed5 | 64 | static unsigned int transport_mtu = 0x401E; |
fce8a7bb JM |
65 | module_param(transport_mtu, uint, 0644); |
66 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
67 | ||
948d3a65 | 68 | static unsigned char max_num_clients; |
fce8a7bb JM |
69 | module_param(max_num_clients, byte, 0644); |
70 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
71 | ||
282a2fee JM |
72 | static unsigned int copy_bytes = 1024; |
73 | module_param(copy_bytes, uint, 0644); | |
74 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
75 | ||
fce8a7bb JM |
76 | struct ntb_queue_entry { |
77 | /* ntb_queue list reference */ | |
78 | struct list_head entry; | |
79 | /* pointers to data to be transfered */ | |
80 | void *cb_data; | |
81 | void *buf; | |
82 | unsigned int len; | |
83 | unsigned int flags; | |
282a2fee JM |
84 | |
85 | struct ntb_transport_qp *qp; | |
86 | union { | |
87 | struct ntb_payload_header __iomem *tx_hdr; | |
88 | struct ntb_payload_header *rx_hdr; | |
89 | }; | |
90 | unsigned int index; | |
fce8a7bb JM |
91 | }; |
92 | ||
793c20e9 JM |
93 | struct ntb_rx_info { |
94 | unsigned int entry; | |
95 | }; | |
96 | ||
fce8a7bb JM |
97 | struct ntb_transport_qp { |
98 | struct ntb_transport *transport; | |
99 | struct ntb_device *ndev; | |
100 | void *cb_data; | |
282a2fee | 101 | struct dma_chan *dma_chan; |
fce8a7bb JM |
102 | |
103 | bool client_ready; | |
104 | bool qp_link; | |
105 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ | |
106 | ||
74465645 | 107 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
108 | struct ntb_rx_info *remote_rx_info; |
109 | ||
fce8a7bb JM |
110 | void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, |
111 | void *data, int len); | |
112 | struct list_head tx_free_q; | |
113 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 114 | void __iomem *tx_mw; |
282a2fee | 115 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
116 | unsigned int tx_index; |
117 | unsigned int tx_max_entry; | |
ef114ed5 | 118 | unsigned int tx_max_frame; |
fce8a7bb JM |
119 | |
120 | void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
121 | void *data, int len); | |
122 | struct tasklet_struct rx_work; | |
123 | struct list_head rx_pend_q; | |
124 | struct list_head rx_free_q; | |
125 | spinlock_t ntb_rx_pend_q_lock; | |
126 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
127 | void *rx_buff; |
128 | unsigned int rx_index; | |
129 | unsigned int rx_max_entry; | |
ef114ed5 | 130 | unsigned int rx_max_frame; |
282a2fee | 131 | dma_cookie_t last_cookie; |
fce8a7bb JM |
132 | |
133 | void (*event_handler) (void *data, int status); | |
134 | struct delayed_work link_work; | |
7b4f2d3c | 135 | struct work_struct link_cleanup; |
fce8a7bb JM |
136 | |
137 | struct dentry *debugfs_dir; | |
138 | struct dentry *debugfs_stats; | |
139 | ||
140 | /* Stats */ | |
141 | u64 rx_bytes; | |
142 | u64 rx_pkts; | |
143 | u64 rx_ring_empty; | |
144 | u64 rx_err_no_buf; | |
145 | u64 rx_err_oflow; | |
146 | u64 rx_err_ver; | |
282a2fee JM |
147 | u64 rx_memcpy; |
148 | u64 rx_async; | |
fce8a7bb JM |
149 | u64 tx_bytes; |
150 | u64 tx_pkts; | |
151 | u64 tx_ring_full; | |
282a2fee JM |
152 | u64 tx_err_no_buf; |
153 | u64 tx_memcpy; | |
154 | u64 tx_async; | |
fce8a7bb JM |
155 | }; |
156 | ||
157 | struct ntb_transport_mw { | |
158 | size_t size; | |
159 | void *virt_addr; | |
160 | dma_addr_t dma_addr; | |
161 | }; | |
162 | ||
163 | struct ntb_transport_client_dev { | |
164 | struct list_head entry; | |
165 | struct device dev; | |
166 | }; | |
167 | ||
168 | struct ntb_transport { | |
169 | struct list_head entry; | |
170 | struct list_head client_devs; | |
171 | ||
172 | struct ntb_device *ndev; | |
948d3a65 | 173 | struct ntb_transport_mw *mw; |
fce8a7bb JM |
174 | struct ntb_transport_qp *qps; |
175 | unsigned int max_qps; | |
176 | unsigned long qp_bitmap; | |
177 | bool transport_link; | |
178 | struct delayed_work link_work; | |
7b4f2d3c | 179 | struct work_struct link_cleanup; |
fce8a7bb JM |
180 | }; |
181 | ||
182 | enum { | |
183 | DESC_DONE_FLAG = 1 << 0, | |
184 | LINK_DOWN_FLAG = 1 << 1, | |
185 | }; | |
186 | ||
187 | struct ntb_payload_header { | |
74465645 | 188 | unsigned int ver; |
fce8a7bb JM |
189 | unsigned int len; |
190 | unsigned int flags; | |
191 | }; | |
192 | ||
193 | enum { | |
194 | VERSION = 0, | |
fce8a7bb | 195 | QP_LINKS, |
113fc505 JM |
196 | NUM_QPS, |
197 | NUM_MWS, | |
198 | MW0_SZ_HIGH, | |
199 | MW0_SZ_LOW, | |
200 | MW1_SZ_HIGH, | |
201 | MW1_SZ_LOW, | |
fce8a7bb JM |
202 | MAX_SPAD, |
203 | }; | |
204 | ||
948d3a65 | 205 | #define QP_TO_MW(ndev, qp) ((qp) % ntb_max_mw(ndev)) |
fce8a7bb JM |
206 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
207 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
208 | ||
209 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
210 | { | |
211 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
212 | } | |
213 | ||
214 | static int ntb_client_probe(struct device *dev) | |
215 | { | |
216 | const struct ntb_client *drv = container_of(dev->driver, | |
217 | struct ntb_client, driver); | |
218 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
219 | int rc = -EINVAL; | |
220 | ||
221 | get_device(dev); | |
222 | if (drv && drv->probe) | |
223 | rc = drv->probe(pdev); | |
224 | if (rc) | |
225 | put_device(dev); | |
226 | ||
227 | return rc; | |
228 | } | |
229 | ||
230 | static int ntb_client_remove(struct device *dev) | |
231 | { | |
232 | const struct ntb_client *drv = container_of(dev->driver, | |
233 | struct ntb_client, driver); | |
234 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
235 | ||
236 | if (drv && drv->remove) | |
237 | drv->remove(pdev); | |
238 | ||
239 | put_device(dev); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
170d35a5 | 244 | static struct bus_type ntb_bus_type = { |
fce8a7bb JM |
245 | .name = "ntb_bus", |
246 | .match = ntb_match_bus, | |
247 | .probe = ntb_client_probe, | |
248 | .remove = ntb_client_remove, | |
249 | }; | |
250 | ||
251 | static LIST_HEAD(ntb_transport_list); | |
252 | ||
78a61ab7 | 253 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
254 | { |
255 | if (list_empty(&ntb_transport_list)) { | |
256 | int rc = bus_register(&ntb_bus_type); | |
257 | if (rc) | |
258 | return rc; | |
259 | } | |
260 | ||
261 | list_add(&nt->entry, &ntb_transport_list); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
78a61ab7 | 266 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
267 | { |
268 | struct ntb_transport_client_dev *client_dev, *cd; | |
269 | ||
270 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
271 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
272 | dev_name(&client_dev->dev)); | |
273 | list_del(&client_dev->entry); | |
274 | device_unregister(&client_dev->dev); | |
275 | } | |
276 | ||
277 | list_del(&nt->entry); | |
278 | ||
279 | if (list_empty(&ntb_transport_list)) | |
280 | bus_unregister(&ntb_bus_type); | |
281 | } | |
282 | ||
283 | static void ntb_client_release(struct device *dev) | |
284 | { | |
285 | struct ntb_transport_client_dev *client_dev; | |
286 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
287 | ||
288 | kfree(client_dev); | |
289 | } | |
290 | ||
291 | /** | |
292 | * ntb_unregister_client_dev - Unregister NTB client device | |
293 | * @device_name: Name of NTB client device | |
294 | * | |
295 | * Unregister an NTB client device with the NTB transport layer | |
296 | */ | |
297 | void ntb_unregister_client_dev(char *device_name) | |
298 | { | |
299 | struct ntb_transport_client_dev *client, *cd; | |
300 | struct ntb_transport *nt; | |
301 | ||
302 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
303 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
304 | if (!strncmp(dev_name(&client->dev), device_name, | |
305 | strlen(device_name))) { | |
306 | list_del(&client->entry); | |
307 | device_unregister(&client->dev); | |
308 | } | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
311 | ||
312 | /** | |
313 | * ntb_register_client_dev - Register NTB client device | |
314 | * @device_name: Name of NTB client device | |
315 | * | |
316 | * Register an NTB client device with the NTB transport layer | |
317 | */ | |
318 | int ntb_register_client_dev(char *device_name) | |
319 | { | |
320 | struct ntb_transport_client_dev *client_dev; | |
321 | struct ntb_transport *nt; | |
8b19d450 | 322 | int rc, i = 0; |
fce8a7bb | 323 | |
8222b402 JM |
324 | if (list_empty(&ntb_transport_list)) |
325 | return -ENODEV; | |
326 | ||
fce8a7bb JM |
327 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
328 | struct device *dev; | |
329 | ||
330 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
331 | GFP_KERNEL); | |
332 | if (!client_dev) { | |
333 | rc = -ENOMEM; | |
334 | goto err; | |
335 | } | |
336 | ||
337 | dev = &client_dev->dev; | |
338 | ||
339 | /* setup and register client devices */ | |
8b19d450 | 340 | dev_set_name(dev, "%s%d", device_name, i); |
fce8a7bb JM |
341 | dev->bus = &ntb_bus_type; |
342 | dev->release = ntb_client_release; | |
343 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
344 | ||
345 | rc = device_register(dev); | |
346 | if (rc) { | |
347 | kfree(client_dev); | |
348 | goto err; | |
349 | } | |
350 | ||
351 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 352 | i++; |
fce8a7bb JM |
353 | } |
354 | ||
355 | return 0; | |
356 | ||
357 | err: | |
358 | ntb_unregister_client_dev(device_name); | |
359 | ||
360 | return rc; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
363 | ||
364 | /** | |
365 | * ntb_register_client - Register NTB client driver | |
366 | * @drv: NTB client driver to be registered | |
367 | * | |
368 | * Register an NTB client driver with the NTB transport layer | |
369 | * | |
370 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
371 | */ | |
372 | int ntb_register_client(struct ntb_client *drv) | |
373 | { | |
374 | drv->driver.bus = &ntb_bus_type; | |
375 | ||
8222b402 JM |
376 | if (list_empty(&ntb_transport_list)) |
377 | return -ENODEV; | |
378 | ||
fce8a7bb JM |
379 | return driver_register(&drv->driver); |
380 | } | |
381 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
382 | ||
383 | /** | |
384 | * ntb_unregister_client - Unregister NTB client driver | |
385 | * @drv: NTB client driver to be unregistered | |
386 | * | |
387 | * Unregister an NTB client driver with the NTB transport layer | |
388 | * | |
389 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
390 | */ | |
391 | void ntb_unregister_client(struct ntb_client *drv) | |
392 | { | |
393 | driver_unregister(&drv->driver); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
396 | ||
fce8a7bb JM |
397 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
398 | loff_t *offp) | |
399 | { | |
400 | struct ntb_transport_qp *qp; | |
d7237e22 | 401 | char *buf; |
fce8a7bb JM |
402 | ssize_t ret, out_offset, out_count; |
403 | ||
282a2fee | 404 | out_count = 1000; |
d7237e22 JM |
405 | |
406 | buf = kmalloc(out_count, GFP_KERNEL); | |
407 | if (!buf) | |
408 | return -ENOMEM; | |
fce8a7bb JM |
409 | |
410 | qp = filp->private_data; | |
411 | out_offset = 0; | |
412 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
413 | "NTB QP stats\n"); | |
414 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
415 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
416 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
417 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
418 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
419 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
420 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
421 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
422 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
423 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
424 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
425 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
426 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
427 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
428 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
429 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
430 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 431 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 432 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 433 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 434 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 435 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
436 | |
437 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
438 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
439 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
440 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
441 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
442 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
443 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
444 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
445 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
446 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
447 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
448 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 449 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 450 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 451 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 452 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 453 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 454 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
455 | |
456 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d7237e22 | 457 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 458 | "Up" : "Down"); |
d7237e22 JM |
459 | if (out_offset > out_count) |
460 | out_offset = out_count; | |
fce8a7bb JM |
461 | |
462 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 463 | kfree(buf); |
fce8a7bb JM |
464 | return ret; |
465 | } | |
466 | ||
467 | static const struct file_operations ntb_qp_debugfs_stats = { | |
468 | .owner = THIS_MODULE, | |
d66d7ac2 | 469 | .open = simple_open, |
fce8a7bb JM |
470 | .read = debugfs_read, |
471 | }; | |
472 | ||
473 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
474 | struct list_head *list) | |
475 | { | |
476 | unsigned long flags; | |
477 | ||
478 | spin_lock_irqsave(lock, flags); | |
479 | list_add_tail(entry, list); | |
480 | spin_unlock_irqrestore(lock, flags); | |
481 | } | |
482 | ||
483 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
484 | struct list_head *list) | |
485 | { | |
486 | struct ntb_queue_entry *entry; | |
487 | unsigned long flags; | |
488 | ||
489 | spin_lock_irqsave(lock, flags); | |
490 | if (list_empty(list)) { | |
491 | entry = NULL; | |
492 | goto out; | |
493 | } | |
494 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
495 | list_del(&entry->entry); | |
496 | out: | |
497 | spin_unlock_irqrestore(lock, flags); | |
498 | ||
499 | return entry; | |
500 | } | |
501 | ||
502 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
503 | unsigned int qp_num) | |
504 | { | |
505 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 506 | unsigned int rx_size, num_qps_mw; |
948d3a65 | 507 | u8 mw_num, mw_max; |
793c20e9 | 508 | unsigned int i; |
fce8a7bb | 509 | |
948d3a65 JM |
510 | mw_max = ntb_max_mw(nt->ndev); |
511 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
512 | ||
74465645 | 513 | WARN_ON(nt->mw[mw_num].virt_addr == NULL); |
fce8a7bb | 514 | |
948d3a65 JM |
515 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
516 | num_qps_mw = nt->max_qps / mw_max + 1; | |
fce8a7bb | 517 | else |
948d3a65 | 518 | num_qps_mw = nt->max_qps / mw_max; |
fce8a7bb | 519 | |
793c20e9 | 520 | rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; |
282a2fee | 521 | qp->rx_buff = nt->mw[mw_num].virt_addr + qp_num / mw_max * rx_size; |
793c20e9 JM |
522 | rx_size -= sizeof(struct ntb_rx_info); |
523 | ||
282a2fee JM |
524 | qp->remote_rx_info = qp->rx_buff + rx_size; |
525 | ||
c9d534c8 JM |
526 | /* Due to housekeeping, there must be atleast 2 buffs */ |
527 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
528 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
529 | qp->rx_index = 0; | |
530 | ||
c9d534c8 | 531 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 532 | |
ef114ed5 | 533 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
534 | for (i = 0; i < qp->rx_max_entry; i++) { |
535 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
536 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 537 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 538 | } |
fce8a7bb JM |
539 | |
540 | qp->rx_pkts = 0; | |
541 | qp->tx_pkts = 0; | |
90f9e934 | 542 | qp->tx_index = 0; |
fce8a7bb JM |
543 | } |
544 | ||
b77b2637 JM |
545 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
546 | { | |
547 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
548 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
549 | ||
550 | if (!mw->virt_addr) | |
551 | return; | |
552 | ||
553 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
554 | mw->virt_addr = NULL; | |
555 | } | |
556 | ||
fce8a7bb JM |
557 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) |
558 | { | |
559 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
560 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb | 561 | |
b77b2637 JM |
562 | /* No need to re-setup */ |
563 | if (mw->size == ALIGN(size, 4096)) | |
564 | return 0; | |
565 | ||
566 | if (mw->size != 0) | |
567 | ntb_free_mw(nt, num_mw); | |
568 | ||
fce8a7bb JM |
569 | /* Alloc memory for receiving data. Must be 4k aligned */ |
570 | mw->size = ALIGN(size, 4096); | |
571 | ||
572 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
573 | GFP_KERNEL); | |
574 | if (!mw->virt_addr) { | |
b77b2637 | 575 | mw->size = 0; |
fce8a7bb JM |
576 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", |
577 | (int) mw->size); | |
578 | return -ENOMEM; | |
579 | } | |
580 | ||
fce8a7bb JM |
581 | /* Notify HW the memory location of the receive buffer */ |
582 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
7b4f2d3c | 587 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 588 | { |
7b4f2d3c JM |
589 | struct ntb_transport_qp *qp = container_of(work, |
590 | struct ntb_transport_qp, | |
591 | link_cleanup); | |
fce8a7bb JM |
592 | struct ntb_transport *nt = qp->transport; |
593 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
594 | ||
595 | if (qp->qp_link == NTB_LINK_DOWN) { | |
596 | cancel_delayed_work_sync(&qp->link_work); | |
597 | return; | |
598 | } | |
599 | ||
600 | if (qp->event_handler) | |
601 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
602 | ||
603 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
604 | qp->qp_link = NTB_LINK_DOWN; | |
605 | ||
606 | if (nt->transport_link == NTB_LINK_UP) | |
607 | schedule_delayed_work(&qp->link_work, | |
608 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
609 | } | |
610 | ||
7b4f2d3c JM |
611 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
612 | { | |
613 | schedule_work(&qp->link_cleanup); | |
614 | } | |
615 | ||
616 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 617 | { |
7b4f2d3c JM |
618 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
619 | link_cleanup); | |
fce8a7bb JM |
620 | int i; |
621 | ||
622 | if (nt->transport_link == NTB_LINK_DOWN) | |
623 | cancel_delayed_work_sync(&nt->link_work); | |
624 | else | |
625 | nt->transport_link = NTB_LINK_DOWN; | |
626 | ||
627 | /* Pass along the info to any clients */ | |
628 | for (i = 0; i < nt->max_qps; i++) | |
629 | if (!test_bit(i, &nt->qp_bitmap)) | |
630 | ntb_qp_link_down(&nt->qps[i]); | |
631 | ||
632 | /* The scratchpad registers keep the values if the remote side | |
633 | * goes down, blast them now to give them a sane value the next | |
634 | * time they are accessed | |
635 | */ | |
636 | for (i = 0; i < MAX_SPAD; i++) | |
637 | ntb_write_local_spad(nt->ndev, i, 0); | |
638 | } | |
639 | ||
640 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
641 | { | |
642 | struct ntb_transport *nt = data; | |
643 | ||
644 | switch (event) { | |
645 | case NTB_EVENT_HW_LINK_UP: | |
646 | schedule_delayed_work(&nt->link_work, 0); | |
647 | break; | |
648 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 649 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
650 | break; |
651 | default: | |
652 | BUG(); | |
653 | } | |
654 | } | |
655 | ||
656 | static void ntb_transport_link_work(struct work_struct *work) | |
657 | { | |
658 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
659 | link_work.work); | |
660 | struct ntb_device *ndev = nt->ndev; | |
661 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
662 | u32 val; | |
663 | int rc, i; | |
664 | ||
113fc505 | 665 | /* send the local info, in the opposite order of the way we read it */ |
948d3a65 | 666 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 JM |
667 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), |
668 | ntb_get_mw_size(ndev, i) >> 32); | |
669 | if (rc) { | |
670 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
671 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
672 | MW0_SZ_HIGH + (i * 2)); | |
673 | goto out; | |
674 | } | |
fce8a7bb | 675 | |
113fc505 JM |
676 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
677 | (u32) ntb_get_mw_size(ndev, i)); | |
678 | if (rc) { | |
679 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
680 | (u32) ntb_get_mw_size(ndev, i), | |
681 | MW0_SZ_LOW + (i * 2)); | |
682 | goto out; | |
683 | } | |
fce8a7bb JM |
684 | } |
685 | ||
948d3a65 | 686 | rc = ntb_write_remote_spad(ndev, NUM_MWS, ntb_max_mw(ndev)); |
fce8a7bb JM |
687 | if (rc) { |
688 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
948d3a65 | 689 | ntb_max_mw(ndev), NUM_MWS); |
fce8a7bb JM |
690 | goto out; |
691 | } | |
692 | ||
693 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
694 | if (rc) { | |
695 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
696 | nt->max_qps, NUM_QPS); | |
697 | goto out; | |
698 | } | |
699 | ||
113fc505 | 700 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
701 | if (rc) { |
702 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 703 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
704 | goto out; |
705 | } | |
706 | ||
707 | /* Query the remote side for its info */ | |
708 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
709 | if (rc) { | |
710 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
711 | goto out; | |
712 | } | |
713 | ||
714 | if (val != NTB_TRANSPORT_VERSION) | |
715 | goto out; | |
716 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
717 | ||
718 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
719 | if (rc) { | |
720 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
721 | goto out; | |
722 | } | |
723 | ||
724 | if (val != nt->max_qps) | |
725 | goto out; | |
726 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
727 | ||
113fc505 | 728 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 729 | if (rc) { |
113fc505 | 730 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
731 | goto out; |
732 | } | |
733 | ||
948d3a65 | 734 | if (val != ntb_max_mw(ndev)) |
fce8a7bb | 735 | goto out; |
113fc505 | 736 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 737 | |
948d3a65 | 738 | for (i = 0; i < ntb_max_mw(ndev); i++) { |
113fc505 | 739 | u64 val64; |
fce8a7bb | 740 | |
113fc505 JM |
741 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
742 | if (rc) { | |
743 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
744 | MW0_SZ_HIGH + (i * 2)); | |
745 | goto out1; | |
746 | } | |
fce8a7bb | 747 | |
113fc505 | 748 | val64 = (u64) val << 32; |
fce8a7bb | 749 | |
113fc505 JM |
750 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
751 | if (rc) { | |
752 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
753 | MW0_SZ_LOW + (i * 2)); | |
754 | goto out1; | |
755 | } | |
756 | ||
757 | val64 |= val; | |
758 | ||
759 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
760 | ||
761 | rc = ntb_set_mw(nt, i, val64); | |
762 | if (rc) | |
763 | goto out1; | |
764 | } | |
fce8a7bb JM |
765 | |
766 | nt->transport_link = NTB_LINK_UP; | |
767 | ||
768 | for (i = 0; i < nt->max_qps; i++) { | |
769 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
770 | ||
771 | ntb_transport_setup_qp_mw(nt, i); | |
772 | ||
773 | if (qp->client_ready == NTB_LINK_UP) | |
774 | schedule_delayed_work(&qp->link_work, 0); | |
775 | } | |
776 | ||
777 | return; | |
778 | ||
113fc505 | 779 | out1: |
948d3a65 | 780 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 781 | ntb_free_mw(nt, i); |
fce8a7bb JM |
782 | out: |
783 | if (ntb_hw_link_status(ndev)) | |
784 | schedule_delayed_work(&nt->link_work, | |
785 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
786 | } | |
787 | ||
788 | static void ntb_qp_link_work(struct work_struct *work) | |
789 | { | |
790 | struct ntb_transport_qp *qp = container_of(work, | |
791 | struct ntb_transport_qp, | |
792 | link_work.work); | |
793 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
794 | struct ntb_transport *nt = qp->transport; | |
795 | int rc, val; | |
796 | ||
797 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
798 | ||
799 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
800 | if (rc) { | |
801 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
802 | return; | |
803 | } | |
804 | ||
805 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
806 | if (rc) | |
807 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
808 | val | 1 << qp->qp_num, QP_LINKS); | |
809 | ||
810 | /* query remote spad for qp ready bits */ | |
811 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
812 | if (rc) | |
813 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
814 | ||
815 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
816 | ||
817 | /* See if the remote side is up */ | |
818 | if (1 << qp->qp_num & val) { | |
819 | qp->qp_link = NTB_LINK_UP; | |
820 | ||
821 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
822 | if (qp->event_handler) | |
823 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
824 | } else if (nt->transport_link == NTB_LINK_UP) | |
825 | schedule_delayed_work(&qp->link_work, | |
826 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
827 | } | |
828 | ||
282a2fee | 829 | static int ntb_transport_init_queue(struct ntb_transport *nt, |
fce8a7bb JM |
830 | unsigned int qp_num) |
831 | { | |
832 | struct ntb_transport_qp *qp; | |
ef114ed5 | 833 | unsigned int num_qps_mw, tx_size; |
948d3a65 | 834 | u8 mw_num, mw_max; |
282a2fee | 835 | u64 qp_offset; |
948d3a65 JM |
836 | |
837 | mw_max = ntb_max_mw(nt->ndev); | |
838 | mw_num = QP_TO_MW(nt->ndev, qp_num); | |
fce8a7bb JM |
839 | |
840 | qp = &nt->qps[qp_num]; | |
841 | qp->qp_num = qp_num; | |
842 | qp->transport = nt; | |
843 | qp->ndev = nt->ndev; | |
844 | qp->qp_link = NTB_LINK_DOWN; | |
845 | qp->client_ready = NTB_LINK_DOWN; | |
846 | qp->event_handler = NULL; | |
847 | ||
948d3a65 JM |
848 | if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max) |
849 | num_qps_mw = nt->max_qps / mw_max + 1; | |
ef114ed5 | 850 | else |
948d3a65 | 851 | num_qps_mw = nt->max_qps / mw_max; |
ef114ed5 | 852 | |
793c20e9 | 853 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
282a2fee JM |
854 | qp_offset = qp_num / mw_max * tx_size; |
855 | qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset; | |
856 | if (!qp->tx_mw) | |
857 | return -EINVAL; | |
858 | ||
859 | qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset; | |
860 | if (!qp->tx_mw_phys) | |
861 | return -EINVAL; | |
862 | ||
793c20e9 | 863 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 864 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 865 | |
c9d534c8 JM |
866 | /* Due to housekeeping, there must be atleast 2 buffs */ |
867 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 868 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 869 | |
1517a3f2 | 870 | if (ntb_query_debugfs(nt->ndev)) { |
fce8a7bb JM |
871 | char debugfs_name[4]; |
872 | ||
873 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
874 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
1517a3f2 | 875 | ntb_query_debugfs(nt->ndev)); |
fce8a7bb JM |
876 | |
877 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
878 | qp->debugfs_dir, qp, | |
879 | &ntb_qp_debugfs_stats); | |
880 | } | |
881 | ||
882 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 883 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
884 | |
885 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
886 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
887 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
888 | ||
889 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
890 | INIT_LIST_HEAD(&qp->rx_free_q); | |
891 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee JM |
892 | |
893 | return 0; | |
fce8a7bb JM |
894 | } |
895 | ||
896 | int ntb_transport_init(struct pci_dev *pdev) | |
897 | { | |
898 | struct ntb_transport *nt; | |
899 | int rc, i; | |
900 | ||
901 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
902 | if (!nt) | |
903 | return -ENOMEM; | |
904 | ||
fce8a7bb JM |
905 | nt->ndev = ntb_register_transport(pdev, nt); |
906 | if (!nt->ndev) { | |
907 | rc = -EIO; | |
908 | goto err; | |
909 | } | |
910 | ||
948d3a65 JM |
911 | nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw), |
912 | GFP_KERNEL); | |
913 | if (!nt->mw) { | |
914 | rc = -ENOMEM; | |
915 | goto err1; | |
916 | } | |
917 | ||
918 | if (max_num_clients) | |
919 | nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients); | |
920 | else | |
921 | nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev)); | |
fce8a7bb JM |
922 | |
923 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
924 | GFP_KERNEL); | |
925 | if (!nt->qps) { | |
926 | rc = -ENOMEM; | |
948d3a65 | 927 | goto err2; |
fce8a7bb JM |
928 | } |
929 | ||
930 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
931 | ||
282a2fee JM |
932 | for (i = 0; i < nt->max_qps; i++) { |
933 | rc = ntb_transport_init_queue(nt, i); | |
934 | if (rc) | |
935 | goto err3; | |
936 | } | |
fce8a7bb JM |
937 | |
938 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 939 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
940 | |
941 | rc = ntb_register_event_callback(nt->ndev, | |
942 | ntb_transport_event_callback); | |
943 | if (rc) | |
948d3a65 | 944 | goto err3; |
fce8a7bb JM |
945 | |
946 | INIT_LIST_HEAD(&nt->client_devs); | |
947 | rc = ntb_bus_init(nt); | |
948 | if (rc) | |
948d3a65 | 949 | goto err4; |
fce8a7bb JM |
950 | |
951 | if (ntb_hw_link_status(nt->ndev)) | |
952 | schedule_delayed_work(&nt->link_work, 0); | |
953 | ||
954 | return 0; | |
955 | ||
948d3a65 | 956 | err4: |
fce8a7bb | 957 | ntb_unregister_event_callback(nt->ndev); |
948d3a65 | 958 | err3: |
fce8a7bb | 959 | kfree(nt->qps); |
948d3a65 JM |
960 | err2: |
961 | kfree(nt->mw); | |
fce8a7bb JM |
962 | err1: |
963 | ntb_unregister_transport(nt->ndev); | |
964 | err: | |
fce8a7bb JM |
965 | kfree(nt); |
966 | return rc; | |
967 | } | |
968 | ||
969 | void ntb_transport_free(void *transport) | |
970 | { | |
971 | struct ntb_transport *nt = transport; | |
948d3a65 | 972 | struct ntb_device *ndev = nt->ndev; |
fce8a7bb JM |
973 | int i; |
974 | ||
975 | nt->transport_link = NTB_LINK_DOWN; | |
976 | ||
977 | /* verify that all the qp's are freed */ | |
1517a3f2 | 978 | for (i = 0; i < nt->max_qps; i++) { |
fce8a7bb JM |
979 | if (!test_bit(i, &nt->qp_bitmap)) |
980 | ntb_transport_free_queue(&nt->qps[i]); | |
1517a3f2 JM |
981 | debugfs_remove_recursive(nt->qps[i].debugfs_dir); |
982 | } | |
fce8a7bb JM |
983 | |
984 | ntb_bus_remove(nt); | |
985 | ||
986 | cancel_delayed_work_sync(&nt->link_work); | |
987 | ||
948d3a65 | 988 | ntb_unregister_event_callback(ndev); |
fce8a7bb | 989 | |
948d3a65 | 990 | for (i = 0; i < ntb_max_mw(ndev); i++) |
113fc505 | 991 | ntb_free_mw(nt, i); |
fce8a7bb JM |
992 | |
993 | kfree(nt->qps); | |
948d3a65 JM |
994 | kfree(nt->mw); |
995 | ntb_unregister_transport(ndev); | |
fce8a7bb JM |
996 | kfree(nt); |
997 | } | |
998 | ||
282a2fee | 999 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1000 | { |
282a2fee JM |
1001 | struct ntb_queue_entry *entry = data; |
1002 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1003 | void *cb_data = entry->cb_data; |
1004 | unsigned int len = entry->len; | |
282a2fee JM |
1005 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1006 | ||
1007 | /* Ensure that the data is fully copied out before clearing the flag */ | |
1008 | wmb(); | |
1009 | hdr->flags = 0; | |
fce8a7bb | 1010 | |
282a2fee | 1011 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1012 | |
1013 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
1014 | |
1015 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
1016 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
1017 | } |
1018 | ||
282a2fee JM |
1019 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1020 | { | |
1021 | void *buf = entry->buf; | |
1022 | size_t len = entry->len; | |
1023 | ||
1024 | memcpy(buf, offset, len); | |
1025 | ||
1026 | ntb_rx_copy_callback(entry); | |
1027 | } | |
1028 | ||
1029 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1030 | size_t len) | |
1031 | { | |
1032 | struct dma_async_tx_descriptor *txd; | |
1033 | struct ntb_transport_qp *qp = entry->qp; | |
1034 | struct dma_chan *chan = qp->dma_chan; | |
1035 | struct dma_device *device; | |
1036 | size_t pay_off, buff_off; | |
1037 | dma_addr_t src, dest; | |
1038 | dma_cookie_t cookie; | |
1039 | void *buf = entry->buf; | |
1040 | unsigned long flags; | |
1041 | ||
1042 | entry->len = len; | |
1043 | ||
1044 | if (!chan) | |
1045 | goto err; | |
1046 | ||
1047 | if (len < copy_bytes) | |
1048 | goto err1; | |
1049 | ||
1050 | device = chan->device; | |
1051 | pay_off = (size_t) offset & ~PAGE_MASK; | |
1052 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1053 | ||
1054 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
1055 | goto err1; | |
1056 | ||
1057 | dest = dma_map_single(device->dev, buf, len, DMA_FROM_DEVICE); | |
1058 | if (dma_mapping_error(device->dev, dest)) | |
1059 | goto err1; | |
1060 | ||
1061 | src = dma_map_single(device->dev, offset, len, DMA_TO_DEVICE); | |
1062 | if (dma_mapping_error(device->dev, src)) | |
1063 | goto err2; | |
1064 | ||
1065 | flags = DMA_COMPL_DEST_UNMAP_SINGLE | DMA_COMPL_SRC_UNMAP_SINGLE | | |
1066 | DMA_PREP_INTERRUPT; | |
1067 | txd = device->device_prep_dma_memcpy(chan, dest, src, len, flags); | |
1068 | if (!txd) | |
1069 | goto err3; | |
1070 | ||
1071 | txd->callback = ntb_rx_copy_callback; | |
1072 | txd->callback_param = entry; | |
1073 | ||
1074 | cookie = dmaengine_submit(txd); | |
1075 | if (dma_submit_error(cookie)) | |
1076 | goto err3; | |
1077 | ||
1078 | qp->last_cookie = cookie; | |
1079 | ||
1080 | qp->rx_async++; | |
1081 | ||
1082 | return; | |
1083 | ||
1084 | err3: | |
1085 | dma_unmap_single(device->dev, src, len, DMA_TO_DEVICE); | |
1086 | err2: | |
1087 | dma_unmap_single(device->dev, dest, len, DMA_FROM_DEVICE); | |
1088 | err1: | |
1089 | /* If the callbacks come out of order, the writing of the index to the | |
1090 | * last completed will be out of order. This may result in the | |
1091 | * receive stalling forever. | |
1092 | */ | |
1093 | dma_sync_wait(chan, qp->last_cookie); | |
1094 | err: | |
1095 | ntb_memcpy_rx(entry, offset); | |
1096 | qp->rx_memcpy++; | |
1097 | } | |
1098 | ||
fce8a7bb JM |
1099 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1100 | { | |
1101 | struct ntb_payload_header *hdr; | |
1102 | struct ntb_queue_entry *entry; | |
1103 | void *offset; | |
1104 | ||
793c20e9 JM |
1105 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1106 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1107 | ||
fce8a7bb JM |
1108 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1109 | if (!entry) { | |
fce8a7bb | 1110 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1111 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
1112 | hdr->ver, hdr->len, hdr->flags); |
1113 | qp->rx_err_no_buf++; | |
1114 | return -ENOMEM; | |
1115 | } | |
1116 | ||
fce8a7bb JM |
1117 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
1118 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1119 | &qp->rx_pend_q); |
fce8a7bb JM |
1120 | qp->rx_ring_empty++; |
1121 | return -EAGAIN; | |
1122 | } | |
1123 | ||
74465645 | 1124 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 1125 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 1126 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
1127 | qp->qp_num, qp->rx_pkts, hdr->ver); |
1128 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 1129 | &qp->rx_pend_q); |
fce8a7bb JM |
1130 | qp->rx_err_ver++; |
1131 | return -EIO; | |
1132 | } | |
1133 | ||
1134 | if (hdr->flags & LINK_DOWN_FLAG) { | |
1135 | ntb_qp_link_down(qp); | |
1136 | ||
282a2fee | 1137 | goto err; |
fce8a7bb JM |
1138 | } |
1139 | ||
1140 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1141 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1142 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1143 | |
282a2fee JM |
1144 | qp->rx_bytes += hdr->len; |
1145 | qp->rx_pkts++; | |
fce8a7bb | 1146 | |
282a2fee | 1147 | if (hdr->len > entry->len) { |
fce8a7bb JM |
1148 | qp->rx_err_oflow++; |
1149 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1150 | "RX overflow! Wanted %d got %d\n", | |
1151 | hdr->len, entry->len); | |
282a2fee JM |
1152 | |
1153 | goto err; | |
fce8a7bb JM |
1154 | } |
1155 | ||
282a2fee JM |
1156 | entry->index = qp->rx_index; |
1157 | entry->rx_hdr = hdr; | |
1158 | ||
1159 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb JM |
1160 | |
1161 | out: | |
282a2fee JM |
1162 | qp->rx_index++; |
1163 | qp->rx_index %= qp->rx_max_entry; | |
1164 | ||
1165 | return 0; | |
1166 | ||
1167 | err: | |
1168 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
1169 | &qp->rx_pend_q); | |
793c20e9 JM |
1170 | /* Ensure that the data is fully copied out before clearing the flag */ |
1171 | wmb(); | |
1172 | hdr->flags = 0; | |
74465645 | 1173 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1174 | |
282a2fee | 1175 | goto out; |
fce8a7bb JM |
1176 | } |
1177 | ||
1178 | static void ntb_transport_rx(unsigned long data) | |
1179 | { | |
1180 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
c336acd3 | 1181 | int rc, i; |
fce8a7bb | 1182 | |
c336acd3 JM |
1183 | /* Limit the number of packets processed in a single interrupt to |
1184 | * provide fairness to others | |
1185 | */ | |
1186 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1187 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1188 | if (rc) |
1189 | break; | |
1190 | } | |
282a2fee JM |
1191 | |
1192 | if (qp->dma_chan) | |
1193 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb JM |
1194 | } |
1195 | ||
1196 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1197 | { | |
1198 | struct ntb_transport_qp *qp = data; | |
1199 | ||
1200 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1201 | __func__, db_num); | |
1202 | ||
1203 | tasklet_schedule(&qp->rx_work); | |
1204 | } | |
1205 | ||
282a2fee | 1206 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1207 | { |
282a2fee JM |
1208 | struct ntb_queue_entry *entry = data; |
1209 | struct ntb_transport_qp *qp = entry->qp; | |
1210 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1211 | |
282a2fee | 1212 | /* Ensure that the data is fully copied out before setting the flags */ |
842c1dde | 1213 | wmb(); |
74465645 | 1214 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1215 | |
49793889 | 1216 | ntb_ring_doorbell(qp->ndev, qp->qp_num); |
fce8a7bb JM |
1217 | |
1218 | /* The entry length can only be zero if the packet is intended to be a | |
1219 | * "link down" or similar. Since no payload is being sent in these | |
1220 | * cases, there is nothing to add to the completion queue. | |
1221 | */ | |
1222 | if (entry->len > 0) { | |
1223 | qp->tx_bytes += entry->len; | |
1224 | ||
1225 | if (qp->tx_handler) | |
1226 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1227 | entry->len); | |
1228 | } | |
1229 | ||
1230 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1231 | } | |
1232 | ||
282a2fee | 1233 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1234 | { |
282a2fee JM |
1235 | memcpy_toio(offset, entry->buf, entry->len); |
1236 | ||
1237 | ntb_tx_copy_callback(entry); | |
1238 | } | |
1239 | ||
1240 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1241 | struct ntb_queue_entry *entry) | |
1242 | { | |
1243 | struct ntb_payload_header __iomem *hdr; | |
1244 | struct dma_async_tx_descriptor *txd; | |
1245 | struct dma_chan *chan = qp->dma_chan; | |
1246 | struct dma_device *device; | |
1247 | size_t dest_off, buff_off; | |
1248 | dma_addr_t src, dest; | |
1249 | dma_cookie_t cookie; | |
74465645 | 1250 | void __iomem *offset; |
282a2fee JM |
1251 | size_t len = entry->len; |
1252 | void *buf = entry->buf; | |
1253 | unsigned long flags; | |
fce8a7bb | 1254 | |
793c20e9 | 1255 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1256 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1257 | entry->tx_hdr = hdr; | |
fce8a7bb | 1258 | |
282a2fee JM |
1259 | iowrite32(entry->len, &hdr->len); |
1260 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
1261 | ||
1262 | if (!chan) | |
1263 | goto err; | |
1264 | ||
1265 | if (len < copy_bytes) | |
1266 | goto err; | |
1267 | ||
1268 | device = chan->device; | |
1269 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
1270 | buff_off = (size_t) buf & ~PAGE_MASK; | |
1271 | dest_off = (size_t) dest & ~PAGE_MASK; | |
1272 | ||
1273 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1274 | goto err; | |
1275 | ||
1276 | src = dma_map_single(device->dev, buf, len, DMA_TO_DEVICE); | |
1277 | if (dma_mapping_error(device->dev, src)) | |
1278 | goto err; | |
1279 | ||
1280 | flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_PREP_INTERRUPT; | |
1281 | txd = device->device_prep_dma_memcpy(chan, dest, src, len, flags); | |
1282 | if (!txd) | |
1283 | goto err1; | |
1284 | ||
1285 | txd->callback = ntb_tx_copy_callback; | |
1286 | txd->callback_param = entry; | |
1287 | ||
1288 | cookie = dmaengine_submit(txd); | |
1289 | if (dma_submit_error(cookie)) | |
1290 | goto err1; | |
1291 | ||
1292 | dma_async_issue_pending(chan); | |
1293 | qp->tx_async++; | |
1294 | ||
1295 | return; | |
1296 | err1: | |
1297 | dma_unmap_single(device->dev, src, len, DMA_TO_DEVICE); | |
1298 | err: | |
1299 | ntb_memcpy_tx(entry, offset); | |
1300 | qp->tx_memcpy++; | |
1301 | } | |
1302 | ||
1303 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1304 | struct ntb_queue_entry *entry) | |
1305 | { | |
1306 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - tx %u, entry len %d flags %x buff %p\n", | |
1307 | qp->tx_pkts, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1308 | entry->buf); |
793c20e9 | 1309 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1310 | qp->tx_ring_full++; |
1311 | return -EAGAIN; | |
1312 | } | |
1313 | ||
ef114ed5 | 1314 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1315 | if (qp->tx_handler) |
1316 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1317 | ||
1318 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1319 | &qp->tx_free_q); | |
1320 | return 0; | |
1321 | } | |
1322 | ||
282a2fee | 1323 | ntb_async_tx(qp, entry); |
fce8a7bb | 1324 | |
793c20e9 JM |
1325 | qp->tx_index++; |
1326 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1327 | |
1328 | qp->tx_pkts++; | |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1334 | { | |
1335 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1336 | struct ntb_queue_entry *entry; | |
1337 | int i, rc; | |
1338 | ||
1339 | if (qp->qp_link == NTB_LINK_DOWN) | |
1340 | return; | |
1341 | ||
1342 | qp->qp_link = NTB_LINK_DOWN; | |
1343 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1344 | ||
1345 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1346 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1347 | if (entry) |
1348 | break; | |
1349 | msleep(100); | |
1350 | } | |
1351 | ||
1352 | if (!entry) | |
1353 | return; | |
1354 | ||
1355 | entry->cb_data = NULL; | |
1356 | entry->buf = NULL; | |
1357 | entry->len = 0; | |
1358 | entry->flags = LINK_DOWN_FLAG; | |
1359 | ||
1360 | rc = ntb_process_tx(qp, entry); | |
1361 | if (rc) | |
1362 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1363 | qp->qp_num); | |
1364 | } | |
1365 | ||
1366 | /** | |
1367 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1368 | * @rx_handler: receive callback function | |
1369 | * @tx_handler: transmit callback function | |
1370 | * @event_handler: event callback function | |
1371 | * | |
1372 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1373 | * routine for both transmit and receive. The receive callback routine will be | |
1374 | * used to pass up data when the transport has received it on the queue. The | |
1375 | * transmit callback routine will be called when the transport has completed the | |
1376 | * transmission of the data on the queue and the data is ready to be freed. | |
1377 | * | |
1378 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1379 | */ | |
1380 | struct ntb_transport_qp * | |
1381 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1382 | const struct ntb_queue_handlers *handlers) | |
1383 | { | |
1384 | struct ntb_queue_entry *entry; | |
1385 | struct ntb_transport_qp *qp; | |
1386 | struct ntb_transport *nt; | |
1387 | unsigned int free_queue; | |
1388 | int rc, i; | |
1389 | ||
1390 | nt = ntb_find_transport(pdev); | |
1391 | if (!nt) | |
1392 | goto err; | |
1393 | ||
1394 | free_queue = ffs(nt->qp_bitmap); | |
1395 | if (!free_queue) | |
1396 | goto err; | |
1397 | ||
1398 | /* decrement free_queue to make it zero based */ | |
1399 | free_queue--; | |
1400 | ||
1401 | clear_bit(free_queue, &nt->qp_bitmap); | |
1402 | ||
1403 | qp = &nt->qps[free_queue]; | |
1404 | qp->cb_data = data; | |
1405 | qp->rx_handler = handlers->rx_handler; | |
1406 | qp->tx_handler = handlers->tx_handler; | |
1407 | qp->event_handler = handlers->event_handler; | |
1408 | ||
282a2fee JM |
1409 | qp->dma_chan = dma_find_channel(DMA_MEMCPY); |
1410 | if (!qp->dma_chan) | |
1411 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); | |
1412 | else | |
1413 | dmaengine_get(); | |
1414 | ||
fce8a7bb JM |
1415 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1416 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1417 | if (!entry) | |
1418 | goto err1; | |
1419 | ||
282a2fee | 1420 | entry->qp = qp; |
fce8a7bb | 1421 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1422 | &qp->rx_free_q); |
fce8a7bb JM |
1423 | } |
1424 | ||
1425 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1426 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1427 | if (!entry) | |
1428 | goto err2; | |
1429 | ||
282a2fee | 1430 | entry->qp = qp; |
fce8a7bb | 1431 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1432 | &qp->tx_free_q); |
fce8a7bb JM |
1433 | } |
1434 | ||
1435 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1436 | ||
1437 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1438 | ntb_transport_rxc_db); | |
1439 | if (rc) | |
1440 | goto err3; | |
1441 | ||
1442 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1443 | ||
1444 | return qp; | |
1445 | ||
1446 | err3: | |
1447 | tasklet_disable(&qp->rx_work); | |
1448 | err2: | |
f766755c | 1449 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1450 | kfree(entry); |
1451 | err1: | |
f766755c | 1452 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1453 | kfree(entry); |
1454 | set_bit(free_queue, &nt->qp_bitmap); | |
1455 | err: | |
1456 | return NULL; | |
1457 | } | |
1458 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1459 | ||
1460 | /** | |
1461 | * ntb_transport_free_queue - Frees NTB transport queue | |
1462 | * @qp: NTB queue to be freed | |
1463 | * | |
1464 | * Frees NTB transport queue | |
1465 | */ | |
1466 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1467 | { | |
186f27ff | 1468 | struct pci_dev *pdev; |
fce8a7bb JM |
1469 | struct ntb_queue_entry *entry; |
1470 | ||
1471 | if (!qp) | |
1472 | return; | |
1473 | ||
186f27ff JM |
1474 | pdev = ntb_query_pdev(qp->ndev); |
1475 | ||
282a2fee JM |
1476 | if (qp->dma_chan) { |
1477 | struct dma_chan *chan = qp->dma_chan; | |
1478 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1479 | * processed by the CPU instead of the DAM engine | |
1480 | */ | |
1481 | qp->dma_chan = NULL; | |
1482 | ||
1483 | /* Try to be nice and wait for any queued DMA engine | |
1484 | * transactions to process before smashing it with a rock | |
1485 | */ | |
1486 | dma_sync_wait(chan, qp->last_cookie); | |
1487 | dmaengine_terminate_all(chan); | |
1488 | dmaengine_put(); | |
1489 | } | |
fce8a7bb JM |
1490 | |
1491 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1492 | tasklet_disable(&qp->rx_work); | |
1493 | ||
282a2fee JM |
1494 | cancel_delayed_work_sync(&qp->link_work); |
1495 | ||
f766755c | 1496 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1497 | kfree(entry); |
1498 | ||
f766755c | 1499 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1500 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1501 | kfree(entry); | |
1502 | } | |
1503 | ||
f766755c | 1504 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1505 | kfree(entry); |
1506 | ||
1507 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1508 | ||
1509 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1510 | } | |
1511 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1512 | ||
1513 | /** | |
1514 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1515 | * @qp: NTB queue to be freed | |
1516 | * @len: pointer to variable to write enqueued buffers length | |
1517 | * | |
1518 | * Dequeues unused buffers from receive queue. Should only be used during | |
1519 | * shutdown of qp. | |
1520 | * | |
1521 | * RETURNS: NULL error value on error, or void* for success. | |
1522 | */ | |
1523 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1524 | { | |
1525 | struct ntb_queue_entry *entry; | |
1526 | void *buf; | |
1527 | ||
1528 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1529 | return NULL; | |
1530 | ||
1531 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1532 | if (!entry) | |
1533 | return NULL; | |
1534 | ||
1535 | buf = entry->cb_data; | |
1536 | *len = entry->len; | |
1537 | ||
f766755c | 1538 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1539 | |
1540 | return buf; | |
1541 | } | |
1542 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1543 | ||
1544 | /** | |
1545 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1546 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1547 | * @cb: per buffer pointer for callback function to use | |
1548 | * @data: pointer to data buffer that incoming packets will be copied into | |
1549 | * @len: length of the data buffer | |
1550 | * | |
1551 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1552 | * payload can be received into. | |
1553 | * | |
1554 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1555 | */ | |
1556 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1557 | unsigned int len) | |
1558 | { | |
1559 | struct ntb_queue_entry *entry; | |
1560 | ||
1561 | if (!qp) | |
1562 | return -EINVAL; | |
1563 | ||
1564 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1565 | if (!entry) | |
1566 | return -ENOMEM; | |
1567 | ||
1568 | entry->cb_data = cb; | |
1569 | entry->buf = data; | |
1570 | entry->len = len; | |
1571 | ||
f766755c | 1572 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1573 | |
1574 | return 0; | |
1575 | } | |
1576 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1577 | ||
1578 | /** | |
1579 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1580 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1581 | * @cb: per buffer pointer for callback function to use | |
1582 | * @data: pointer to data buffer that will be sent | |
1583 | * @len: length of the data buffer | |
1584 | * | |
1585 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1586 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1587 | * serialize access to the qp. |
1588 | * | |
1589 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1590 | */ | |
1591 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1592 | unsigned int len) | |
1593 | { | |
1594 | struct ntb_queue_entry *entry; | |
1595 | int rc; | |
1596 | ||
1597 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1598 | return -EINVAL; | |
1599 | ||
1600 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1601 | if (!entry) { |
1602 | qp->tx_err_no_buf++; | |
fce8a7bb | 1603 | return -ENOMEM; |
282a2fee | 1604 | } |
fce8a7bb JM |
1605 | |
1606 | entry->cb_data = cb; | |
1607 | entry->buf = data; | |
1608 | entry->len = len; | |
1609 | entry->flags = 0; | |
1610 | ||
1611 | rc = ntb_process_tx(qp, entry); | |
1612 | if (rc) | |
1613 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1614 | &qp->tx_free_q); | |
1615 | ||
1616 | return rc; | |
1617 | } | |
1618 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1619 | ||
1620 | /** | |
1621 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1622 | * @qp: NTB transport layer queue to be enabled | |
1623 | * | |
1624 | * Notify NTB transport layer of client readiness to use queue | |
1625 | */ | |
1626 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1627 | { | |
1628 | if (!qp) | |
1629 | return; | |
1630 | ||
1631 | qp->client_ready = NTB_LINK_UP; | |
1632 | ||
1633 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1634 | schedule_delayed_work(&qp->link_work, 0); | |
1635 | } | |
1636 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1637 | ||
1638 | /** | |
1639 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1640 | * @qp: NTB transport layer queue to be disabled | |
1641 | * | |
1642 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1643 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1644 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1645 | */ |
1646 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1647 | { | |
186f27ff | 1648 | struct pci_dev *pdev; |
fce8a7bb JM |
1649 | int rc, val; |
1650 | ||
1651 | if (!qp) | |
1652 | return; | |
1653 | ||
186f27ff | 1654 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1655 | qp->client_ready = NTB_LINK_DOWN; |
1656 | ||
1657 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1658 | if (rc) { | |
1659 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1660 | return; | |
1661 | } | |
1662 | ||
1663 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1664 | val & ~(1 << qp->qp_num)); | |
1665 | if (rc) | |
1666 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1667 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1668 | ||
1669 | if (qp->qp_link == NTB_LINK_UP) | |
1670 | ntb_send_link_down(qp); | |
1671 | else | |
1672 | cancel_delayed_work_sync(&qp->link_work); | |
1673 | } | |
1674 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1675 | ||
1676 | /** | |
1677 | * ntb_transport_link_query - Query transport link state | |
1678 | * @qp: NTB transport layer queue to be queried | |
1679 | * | |
1680 | * Query connectivity to the remote system of the NTB transport queue | |
1681 | * | |
1682 | * RETURNS: true for link up or false for link down | |
1683 | */ | |
1684 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1685 | { | |
186f27ff JM |
1686 | if (!qp) |
1687 | return false; | |
1688 | ||
fce8a7bb JM |
1689 | return qp->qp_link == NTB_LINK_UP; |
1690 | } | |
1691 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1692 | ||
1693 | /** | |
1694 | * ntb_transport_qp_num - Query the qp number | |
1695 | * @qp: NTB transport layer queue to be queried | |
1696 | * | |
1697 | * Query qp number of the NTB transport queue | |
1698 | * | |
1699 | * RETURNS: a zero based number specifying the qp number | |
1700 | */ | |
1701 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1702 | { | |
186f27ff JM |
1703 | if (!qp) |
1704 | return 0; | |
1705 | ||
fce8a7bb JM |
1706 | return qp->qp_num; |
1707 | } | |
1708 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1709 | ||
1710 | /** | |
1711 | * ntb_transport_max_size - Query the max payload size of a qp | |
1712 | * @qp: NTB transport layer queue to be queried | |
1713 | * | |
1714 | * Query the maximum payload size permissible on the given qp | |
1715 | * | |
1716 | * RETURNS: the max payload size of a qp | |
1717 | */ | |
ef114ed5 | 1718 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1719 | { |
282a2fee JM |
1720 | unsigned int max; |
1721 | ||
186f27ff JM |
1722 | if (!qp) |
1723 | return 0; | |
1724 | ||
282a2fee JM |
1725 | if (!qp->dma_chan) |
1726 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1727 | ||
1728 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1729 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1730 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1731 | ||
1732 | return max; | |
fce8a7bb JM |
1733 | } |
1734 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |