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Commit | Line | Data |
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fce8a7bb JM |
1 | /* |
2 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
3 | * redistributing this file, you may do so under either license. | |
4 | * | |
5 | * GPL LICENSE SUMMARY | |
6 | * | |
7 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * BSD LICENSE | |
14 | * | |
15 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * | |
21 | * * Redistributions of source code must retain the above copyright | |
22 | * notice, this list of conditions and the following disclaimer. | |
23 | * * Redistributions in binary form must reproduce the above copy | |
24 | * notice, this list of conditions and the following disclaimer in | |
25 | * the documentation and/or other materials provided with the | |
26 | * distribution. | |
27 | * * Neither the name of Intel Corporation nor the names of its | |
28 | * contributors may be used to endorse or promote products derived | |
29 | * from this software without specific prior written permission. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
36 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
37 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
38 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
39 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
40 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
41 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
42 | * | |
43 | * Intel PCIe NTB Linux driver | |
44 | * | |
45 | * Contact Information: | |
46 | * Jon Mason <jon.mason@intel.com> | |
47 | */ | |
48 | #include <linux/debugfs.h> | |
49 | #include <linux/delay.h> | |
50 | #include <linux/dma-mapping.h> | |
51 | #include <linux/errno.h> | |
52 | #include <linux/export.h> | |
53 | #include <linux/interrupt.h> | |
54 | #include <linux/module.h> | |
55 | #include <linux/pci.h> | |
56 | #include <linux/slab.h> | |
57 | #include <linux/types.h> | |
58 | #include <linux/ntb.h> | |
59 | #include "ntb_hw.h" | |
60 | ||
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 | ||
67 | static unsigned char max_num_clients = 2; | |
68 | module_param(max_num_clients, byte, 0644); | |
69 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
70 | ||
71 | struct ntb_queue_entry { | |
72 | /* ntb_queue list reference */ | |
73 | struct list_head entry; | |
74 | /* pointers to data to be transfered */ | |
75 | void *cb_data; | |
76 | void *buf; | |
77 | unsigned int len; | |
78 | unsigned int flags; | |
79 | }; | |
80 | ||
793c20e9 JM |
81 | struct ntb_rx_info { |
82 | unsigned int entry; | |
83 | }; | |
84 | ||
fce8a7bb JM |
85 | struct ntb_transport_qp { |
86 | struct ntb_transport *transport; | |
87 | struct ntb_device *ndev; | |
88 | void *cb_data; | |
89 | ||
90 | bool client_ready; | |
91 | bool qp_link; | |
92 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ | |
93 | ||
74465645 | 94 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
95 | struct ntb_rx_info *remote_rx_info; |
96 | ||
fce8a7bb JM |
97 | void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, |
98 | void *data, int len); | |
99 | struct list_head tx_free_q; | |
100 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 101 | void __iomem *tx_mw; |
793c20e9 JM |
102 | unsigned int tx_index; |
103 | unsigned int tx_max_entry; | |
ef114ed5 | 104 | unsigned int tx_max_frame; |
fce8a7bb JM |
105 | |
106 | void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, | |
107 | void *data, int len); | |
108 | struct tasklet_struct rx_work; | |
109 | struct list_head rx_pend_q; | |
110 | struct list_head rx_free_q; | |
111 | spinlock_t ntb_rx_pend_q_lock; | |
112 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
113 | void *rx_buff; |
114 | unsigned int rx_index; | |
115 | unsigned int rx_max_entry; | |
ef114ed5 | 116 | unsigned int rx_max_frame; |
fce8a7bb JM |
117 | |
118 | void (*event_handler) (void *data, int status); | |
119 | struct delayed_work link_work; | |
7b4f2d3c | 120 | struct work_struct link_cleanup; |
fce8a7bb JM |
121 | |
122 | struct dentry *debugfs_dir; | |
123 | struct dentry *debugfs_stats; | |
124 | ||
125 | /* Stats */ | |
126 | u64 rx_bytes; | |
127 | u64 rx_pkts; | |
128 | u64 rx_ring_empty; | |
129 | u64 rx_err_no_buf; | |
130 | u64 rx_err_oflow; | |
131 | u64 rx_err_ver; | |
132 | u64 tx_bytes; | |
133 | u64 tx_pkts; | |
134 | u64 tx_ring_full; | |
135 | }; | |
136 | ||
137 | struct ntb_transport_mw { | |
138 | size_t size; | |
139 | void *virt_addr; | |
140 | dma_addr_t dma_addr; | |
141 | }; | |
142 | ||
143 | struct ntb_transport_client_dev { | |
144 | struct list_head entry; | |
145 | struct device dev; | |
146 | }; | |
147 | ||
148 | struct ntb_transport { | |
149 | struct list_head entry; | |
150 | struct list_head client_devs; | |
151 | ||
152 | struct ntb_device *ndev; | |
153 | struct ntb_transport_mw mw[NTB_NUM_MW]; | |
154 | struct ntb_transport_qp *qps; | |
155 | unsigned int max_qps; | |
156 | unsigned long qp_bitmap; | |
157 | bool transport_link; | |
158 | struct delayed_work link_work; | |
7b4f2d3c | 159 | struct work_struct link_cleanup; |
fce8a7bb JM |
160 | struct dentry *debugfs_dir; |
161 | }; | |
162 | ||
163 | enum { | |
164 | DESC_DONE_FLAG = 1 << 0, | |
165 | LINK_DOWN_FLAG = 1 << 1, | |
166 | }; | |
167 | ||
168 | struct ntb_payload_header { | |
74465645 | 169 | unsigned int ver; |
fce8a7bb JM |
170 | unsigned int len; |
171 | unsigned int flags; | |
172 | }; | |
173 | ||
174 | enum { | |
175 | VERSION = 0, | |
fce8a7bb | 176 | QP_LINKS, |
113fc505 JM |
177 | NUM_QPS, |
178 | NUM_MWS, | |
179 | MW0_SZ_HIGH, | |
180 | MW0_SZ_LOW, | |
181 | MW1_SZ_HIGH, | |
182 | MW1_SZ_LOW, | |
fce8a7bb JM |
183 | MAX_SPAD, |
184 | }; | |
185 | ||
186 | #define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) | |
187 | #define NTB_QP_DEF_NUM_ENTRIES 100 | |
188 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
189 | ||
190 | static int ntb_match_bus(struct device *dev, struct device_driver *drv) | |
191 | { | |
192 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
193 | } | |
194 | ||
195 | static int ntb_client_probe(struct device *dev) | |
196 | { | |
197 | const struct ntb_client *drv = container_of(dev->driver, | |
198 | struct ntb_client, driver); | |
199 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
200 | int rc = -EINVAL; | |
201 | ||
202 | get_device(dev); | |
203 | if (drv && drv->probe) | |
204 | rc = drv->probe(pdev); | |
205 | if (rc) | |
206 | put_device(dev); | |
207 | ||
208 | return rc; | |
209 | } | |
210 | ||
211 | static int ntb_client_remove(struct device *dev) | |
212 | { | |
213 | const struct ntb_client *drv = container_of(dev->driver, | |
214 | struct ntb_client, driver); | |
215 | struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev); | |
216 | ||
217 | if (drv && drv->remove) | |
218 | drv->remove(pdev); | |
219 | ||
220 | put_device(dev); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
170d35a5 | 225 | static struct bus_type ntb_bus_type = { |
fce8a7bb JM |
226 | .name = "ntb_bus", |
227 | .match = ntb_match_bus, | |
228 | .probe = ntb_client_probe, | |
229 | .remove = ntb_client_remove, | |
230 | }; | |
231 | ||
232 | static LIST_HEAD(ntb_transport_list); | |
233 | ||
78a61ab7 | 234 | static int ntb_bus_init(struct ntb_transport *nt) |
fce8a7bb JM |
235 | { |
236 | if (list_empty(&ntb_transport_list)) { | |
237 | int rc = bus_register(&ntb_bus_type); | |
238 | if (rc) | |
239 | return rc; | |
240 | } | |
241 | ||
242 | list_add(&nt->entry, &ntb_transport_list); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
78a61ab7 | 247 | static void ntb_bus_remove(struct ntb_transport *nt) |
fce8a7bb JM |
248 | { |
249 | struct ntb_transport_client_dev *client_dev, *cd; | |
250 | ||
251 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
252 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
253 | dev_name(&client_dev->dev)); | |
254 | list_del(&client_dev->entry); | |
255 | device_unregister(&client_dev->dev); | |
256 | } | |
257 | ||
258 | list_del(&nt->entry); | |
259 | ||
260 | if (list_empty(&ntb_transport_list)) | |
261 | bus_unregister(&ntb_bus_type); | |
262 | } | |
263 | ||
264 | static void ntb_client_release(struct device *dev) | |
265 | { | |
266 | struct ntb_transport_client_dev *client_dev; | |
267 | client_dev = container_of(dev, struct ntb_transport_client_dev, dev); | |
268 | ||
269 | kfree(client_dev); | |
270 | } | |
271 | ||
272 | /** | |
273 | * ntb_unregister_client_dev - Unregister NTB client device | |
274 | * @device_name: Name of NTB client device | |
275 | * | |
276 | * Unregister an NTB client device with the NTB transport layer | |
277 | */ | |
278 | void ntb_unregister_client_dev(char *device_name) | |
279 | { | |
280 | struct ntb_transport_client_dev *client, *cd; | |
281 | struct ntb_transport *nt; | |
282 | ||
283 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
284 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
285 | if (!strncmp(dev_name(&client->dev), device_name, | |
286 | strlen(device_name))) { | |
287 | list_del(&client->entry); | |
288 | device_unregister(&client->dev); | |
289 | } | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(ntb_unregister_client_dev); | |
292 | ||
293 | /** | |
294 | * ntb_register_client_dev - Register NTB client device | |
295 | * @device_name: Name of NTB client device | |
296 | * | |
297 | * Register an NTB client device with the NTB transport layer | |
298 | */ | |
299 | int ntb_register_client_dev(char *device_name) | |
300 | { | |
301 | struct ntb_transport_client_dev *client_dev; | |
302 | struct ntb_transport *nt; | |
303 | int rc; | |
304 | ||
8222b402 JM |
305 | if (list_empty(&ntb_transport_list)) |
306 | return -ENODEV; | |
307 | ||
fce8a7bb JM |
308 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
309 | struct device *dev; | |
310 | ||
311 | client_dev = kzalloc(sizeof(struct ntb_transport_client_dev), | |
312 | GFP_KERNEL); | |
313 | if (!client_dev) { | |
314 | rc = -ENOMEM; | |
315 | goto err; | |
316 | } | |
317 | ||
318 | dev = &client_dev->dev; | |
319 | ||
320 | /* setup and register client devices */ | |
321 | dev_set_name(dev, "%s", device_name); | |
322 | dev->bus = &ntb_bus_type; | |
323 | dev->release = ntb_client_release; | |
324 | dev->parent = &ntb_query_pdev(nt->ndev)->dev; | |
325 | ||
326 | rc = device_register(dev); | |
327 | if (rc) { | |
328 | kfree(client_dev); | |
329 | goto err; | |
330 | } | |
331 | ||
332 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
333 | } | |
334 | ||
335 | return 0; | |
336 | ||
337 | err: | |
338 | ntb_unregister_client_dev(device_name); | |
339 | ||
340 | return rc; | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
343 | ||
344 | /** | |
345 | * ntb_register_client - Register NTB client driver | |
346 | * @drv: NTB client driver to be registered | |
347 | * | |
348 | * Register an NTB client driver with the NTB transport layer | |
349 | * | |
350 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
351 | */ | |
352 | int ntb_register_client(struct ntb_client *drv) | |
353 | { | |
354 | drv->driver.bus = &ntb_bus_type; | |
355 | ||
8222b402 JM |
356 | if (list_empty(&ntb_transport_list)) |
357 | return -ENODEV; | |
358 | ||
fce8a7bb JM |
359 | return driver_register(&drv->driver); |
360 | } | |
361 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
362 | ||
363 | /** | |
364 | * ntb_unregister_client - Unregister NTB client driver | |
365 | * @drv: NTB client driver to be unregistered | |
366 | * | |
367 | * Unregister an NTB client driver with the NTB transport layer | |
368 | * | |
369 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
370 | */ | |
371 | void ntb_unregister_client(struct ntb_client *drv) | |
372 | { | |
373 | driver_unregister(&drv->driver); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
376 | ||
fce8a7bb JM |
377 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
378 | loff_t *offp) | |
379 | { | |
380 | struct ntb_transport_qp *qp; | |
d7237e22 | 381 | char *buf; |
fce8a7bb JM |
382 | ssize_t ret, out_offset, out_count; |
383 | ||
d7237e22 JM |
384 | out_count = 600; |
385 | ||
386 | buf = kmalloc(out_count, GFP_KERNEL); | |
387 | if (!buf) | |
388 | return -ENOMEM; | |
fce8a7bb JM |
389 | |
390 | qp = filp->private_data; | |
391 | out_offset = 0; | |
392 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
393 | "NTB QP stats\n"); | |
394 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
395 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
396 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
397 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
398 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
399 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
400 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
401 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
402 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
403 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
404 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
405 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
406 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 407 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 408 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 409 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 410 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 411 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
412 | |
413 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
414 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
415 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
416 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
417 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
418 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
419 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 420 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 421 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 422 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 423 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 424 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
425 | |
426 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d7237e22 | 427 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 428 | "Up" : "Down"); |
d7237e22 JM |
429 | if (out_offset > out_count) |
430 | out_offset = out_count; | |
fce8a7bb JM |
431 | |
432 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 433 | kfree(buf); |
fce8a7bb JM |
434 | return ret; |
435 | } | |
436 | ||
437 | static const struct file_operations ntb_qp_debugfs_stats = { | |
438 | .owner = THIS_MODULE, | |
d66d7ac2 | 439 | .open = simple_open, |
fce8a7bb JM |
440 | .read = debugfs_read, |
441 | }; | |
442 | ||
443 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
444 | struct list_head *list) | |
445 | { | |
446 | unsigned long flags; | |
447 | ||
448 | spin_lock_irqsave(lock, flags); | |
449 | list_add_tail(entry, list); | |
450 | spin_unlock_irqrestore(lock, flags); | |
451 | } | |
452 | ||
453 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
454 | struct list_head *list) | |
455 | { | |
456 | struct ntb_queue_entry *entry; | |
457 | unsigned long flags; | |
458 | ||
459 | spin_lock_irqsave(lock, flags); | |
460 | if (list_empty(list)) { | |
461 | entry = NULL; | |
462 | goto out; | |
463 | } | |
464 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
465 | list_del(&entry->entry); | |
466 | out: | |
467 | spin_unlock_irqrestore(lock, flags); | |
468 | ||
469 | return entry; | |
470 | } | |
471 | ||
472 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
473 | unsigned int qp_num) | |
474 | { | |
475 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 476 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 477 | u8 mw_num = QP_TO_MW(qp_num); |
793c20e9 | 478 | unsigned int i; |
fce8a7bb | 479 | |
74465645 | 480 | WARN_ON(nt->mw[mw_num].virt_addr == NULL); |
fce8a7bb | 481 | |
ef114ed5 JM |
482 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
483 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
484 | else |
485 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
486 | ||
793c20e9 JM |
487 | rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; |
488 | qp->remote_rx_info = nt->mw[mw_num].virt_addr + | |
489 | (qp_num / NTB_NUM_MW * rx_size); | |
490 | rx_size -= sizeof(struct ntb_rx_info); | |
491 | ||
cc0f868d | 492 | qp->rx_buff = qp->remote_rx_info + 1; |
c9d534c8 JM |
493 | /* Due to housekeeping, there must be atleast 2 buffs */ |
494 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
495 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
496 | qp->rx_index = 0; | |
497 | ||
c9d534c8 | 498 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 499 | |
ef114ed5 | 500 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
501 | for (i = 0; i < qp->rx_max_entry; i++) { |
502 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
503 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 504 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 505 | } |
fce8a7bb JM |
506 | |
507 | qp->rx_pkts = 0; | |
508 | qp->tx_pkts = 0; | |
90f9e934 | 509 | qp->tx_index = 0; |
fce8a7bb JM |
510 | } |
511 | ||
b77b2637 JM |
512 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
513 | { | |
514 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
515 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
516 | ||
517 | if (!mw->virt_addr) | |
518 | return; | |
519 | ||
520 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
521 | mw->virt_addr = NULL; | |
522 | } | |
523 | ||
fce8a7bb JM |
524 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) |
525 | { | |
526 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
527 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb | 528 | |
b77b2637 JM |
529 | /* No need to re-setup */ |
530 | if (mw->size == ALIGN(size, 4096)) | |
531 | return 0; | |
532 | ||
533 | if (mw->size != 0) | |
534 | ntb_free_mw(nt, num_mw); | |
535 | ||
fce8a7bb JM |
536 | /* Alloc memory for receiving data. Must be 4k aligned */ |
537 | mw->size = ALIGN(size, 4096); | |
538 | ||
539 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
540 | GFP_KERNEL); | |
541 | if (!mw->virt_addr) { | |
b77b2637 | 542 | mw->size = 0; |
fce8a7bb JM |
543 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", |
544 | (int) mw->size); | |
545 | return -ENOMEM; | |
546 | } | |
547 | ||
fce8a7bb JM |
548 | /* Notify HW the memory location of the receive buffer */ |
549 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
7b4f2d3c | 554 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 555 | { |
7b4f2d3c JM |
556 | struct ntb_transport_qp *qp = container_of(work, |
557 | struct ntb_transport_qp, | |
558 | link_cleanup); | |
fce8a7bb JM |
559 | struct ntb_transport *nt = qp->transport; |
560 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
561 | ||
562 | if (qp->qp_link == NTB_LINK_DOWN) { | |
563 | cancel_delayed_work_sync(&qp->link_work); | |
564 | return; | |
565 | } | |
566 | ||
567 | if (qp->event_handler) | |
568 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
569 | ||
570 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
571 | qp->qp_link = NTB_LINK_DOWN; | |
572 | ||
573 | if (nt->transport_link == NTB_LINK_UP) | |
574 | schedule_delayed_work(&qp->link_work, | |
575 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
576 | } | |
577 | ||
7b4f2d3c JM |
578 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
579 | { | |
580 | schedule_work(&qp->link_cleanup); | |
581 | } | |
582 | ||
583 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 584 | { |
7b4f2d3c JM |
585 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
586 | link_cleanup); | |
fce8a7bb JM |
587 | int i; |
588 | ||
589 | if (nt->transport_link == NTB_LINK_DOWN) | |
590 | cancel_delayed_work_sync(&nt->link_work); | |
591 | else | |
592 | nt->transport_link = NTB_LINK_DOWN; | |
593 | ||
594 | /* Pass along the info to any clients */ | |
595 | for (i = 0; i < nt->max_qps; i++) | |
596 | if (!test_bit(i, &nt->qp_bitmap)) | |
597 | ntb_qp_link_down(&nt->qps[i]); | |
598 | ||
599 | /* The scratchpad registers keep the values if the remote side | |
600 | * goes down, blast them now to give them a sane value the next | |
601 | * time they are accessed | |
602 | */ | |
603 | for (i = 0; i < MAX_SPAD; i++) | |
604 | ntb_write_local_spad(nt->ndev, i, 0); | |
605 | } | |
606 | ||
607 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
608 | { | |
609 | struct ntb_transport *nt = data; | |
610 | ||
611 | switch (event) { | |
612 | case NTB_EVENT_HW_LINK_UP: | |
613 | schedule_delayed_work(&nt->link_work, 0); | |
614 | break; | |
615 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 616 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
617 | break; |
618 | default: | |
619 | BUG(); | |
620 | } | |
621 | } | |
622 | ||
623 | static void ntb_transport_link_work(struct work_struct *work) | |
624 | { | |
625 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
626 | link_work.work); | |
627 | struct ntb_device *ndev = nt->ndev; | |
628 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
629 | u32 val; | |
630 | int rc, i; | |
631 | ||
113fc505 JM |
632 | /* send the local info, in the opposite order of the way we read it */ |
633 | for (i = 0; i < NTB_NUM_MW; i++) { | |
634 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), | |
635 | ntb_get_mw_size(ndev, i) >> 32); | |
636 | if (rc) { | |
637 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
638 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
639 | MW0_SZ_HIGH + (i * 2)); | |
640 | goto out; | |
641 | } | |
fce8a7bb | 642 | |
113fc505 JM |
643 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
644 | (u32) ntb_get_mw_size(ndev, i)); | |
645 | if (rc) { | |
646 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
647 | (u32) ntb_get_mw_size(ndev, i), | |
648 | MW0_SZ_LOW + (i * 2)); | |
649 | goto out; | |
650 | } | |
fce8a7bb JM |
651 | } |
652 | ||
113fc505 | 653 | rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW); |
fce8a7bb JM |
654 | if (rc) { |
655 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 656 | NTB_NUM_MW, NUM_MWS); |
fce8a7bb JM |
657 | goto out; |
658 | } | |
659 | ||
660 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
661 | if (rc) { | |
662 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
663 | nt->max_qps, NUM_QPS); | |
664 | goto out; | |
665 | } | |
666 | ||
113fc505 | 667 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
668 | if (rc) { |
669 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 670 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
671 | goto out; |
672 | } | |
673 | ||
674 | /* Query the remote side for its info */ | |
675 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
676 | if (rc) { | |
677 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
678 | goto out; | |
679 | } | |
680 | ||
681 | if (val != NTB_TRANSPORT_VERSION) | |
682 | goto out; | |
683 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
684 | ||
685 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
686 | if (rc) { | |
687 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
688 | goto out; | |
689 | } | |
690 | ||
691 | if (val != nt->max_qps) | |
692 | goto out; | |
693 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
694 | ||
113fc505 | 695 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 696 | if (rc) { |
113fc505 | 697 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
698 | goto out; |
699 | } | |
700 | ||
113fc505 | 701 | if (val != NTB_NUM_MW) |
fce8a7bb | 702 | goto out; |
113fc505 | 703 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 704 | |
113fc505 JM |
705 | for (i = 0; i < NTB_NUM_MW; i++) { |
706 | u64 val64; | |
fce8a7bb | 707 | |
113fc505 JM |
708 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
709 | if (rc) { | |
710 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
711 | MW0_SZ_HIGH + (i * 2)); | |
712 | goto out1; | |
713 | } | |
fce8a7bb | 714 | |
113fc505 | 715 | val64 = (u64) val << 32; |
fce8a7bb | 716 | |
113fc505 JM |
717 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
718 | if (rc) { | |
719 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
720 | MW0_SZ_LOW + (i * 2)); | |
721 | goto out1; | |
722 | } | |
723 | ||
724 | val64 |= val; | |
725 | ||
726 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
727 | ||
728 | rc = ntb_set_mw(nt, i, val64); | |
729 | if (rc) | |
730 | goto out1; | |
731 | } | |
fce8a7bb JM |
732 | |
733 | nt->transport_link = NTB_LINK_UP; | |
734 | ||
735 | for (i = 0; i < nt->max_qps; i++) { | |
736 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
737 | ||
738 | ntb_transport_setup_qp_mw(nt, i); | |
739 | ||
740 | if (qp->client_ready == NTB_LINK_UP) | |
741 | schedule_delayed_work(&qp->link_work, 0); | |
742 | } | |
743 | ||
744 | return; | |
745 | ||
113fc505 JM |
746 | out1: |
747 | for (i = 0; i < NTB_NUM_MW; i++) | |
748 | ntb_free_mw(nt, i); | |
fce8a7bb JM |
749 | out: |
750 | if (ntb_hw_link_status(ndev)) | |
751 | schedule_delayed_work(&nt->link_work, | |
752 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
753 | } | |
754 | ||
755 | static void ntb_qp_link_work(struct work_struct *work) | |
756 | { | |
757 | struct ntb_transport_qp *qp = container_of(work, | |
758 | struct ntb_transport_qp, | |
759 | link_work.work); | |
760 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
761 | struct ntb_transport *nt = qp->transport; | |
762 | int rc, val; | |
763 | ||
764 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
765 | ||
766 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
767 | if (rc) { | |
768 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
769 | return; | |
770 | } | |
771 | ||
772 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
773 | if (rc) | |
774 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
775 | val | 1 << qp->qp_num, QP_LINKS); | |
776 | ||
777 | /* query remote spad for qp ready bits */ | |
778 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
779 | if (rc) | |
780 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
781 | ||
782 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
783 | ||
784 | /* See if the remote side is up */ | |
785 | if (1 << qp->qp_num & val) { | |
786 | qp->qp_link = NTB_LINK_UP; | |
787 | ||
788 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
789 | if (qp->event_handler) | |
790 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
791 | } else if (nt->transport_link == NTB_LINK_UP) | |
792 | schedule_delayed_work(&qp->link_work, | |
793 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
794 | } | |
795 | ||
796 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
797 | unsigned int qp_num) | |
798 | { | |
799 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
800 | unsigned int num_qps_mw, tx_size; |
801 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
802 | |
803 | qp = &nt->qps[qp_num]; | |
804 | qp->qp_num = qp_num; | |
805 | qp->transport = nt; | |
806 | qp->ndev = nt->ndev; | |
807 | qp->qp_link = NTB_LINK_DOWN; | |
808 | qp->client_ready = NTB_LINK_DOWN; | |
809 | qp->event_handler = NULL; | |
810 | ||
ef114ed5 JM |
811 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
812 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
813 | else | |
814 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
815 | ||
793c20e9 JM |
816 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
817 | qp->rx_info = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
818 | (qp_num / NTB_NUM_MW * tx_size); | |
819 | tx_size -= sizeof(struct ntb_rx_info); | |
820 | ||
cc0f868d | 821 | qp->tx_mw = qp->rx_info + 1; |
c9d534c8 JM |
822 | /* Due to housekeeping, there must be atleast 2 buffs */ |
823 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 824 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 825 | |
fce8a7bb JM |
826 | if (nt->debugfs_dir) { |
827 | char debugfs_name[4]; | |
828 | ||
829 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
830 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
831 | nt->debugfs_dir); | |
832 | ||
833 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
834 | qp->debugfs_dir, qp, | |
835 | &ntb_qp_debugfs_stats); | |
836 | } | |
837 | ||
838 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 839 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
840 | |
841 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
842 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
843 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
844 | ||
845 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
846 | INIT_LIST_HEAD(&qp->rx_free_q); | |
847 | INIT_LIST_HEAD(&qp->tx_free_q); | |
848 | } | |
849 | ||
850 | int ntb_transport_init(struct pci_dev *pdev) | |
851 | { | |
852 | struct ntb_transport *nt; | |
853 | int rc, i; | |
854 | ||
855 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
856 | if (!nt) | |
857 | return -ENOMEM; | |
858 | ||
859 | if (debugfs_initialized()) | |
860 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
861 | else | |
862 | nt->debugfs_dir = NULL; | |
863 | ||
864 | nt->ndev = ntb_register_transport(pdev, nt); | |
865 | if (!nt->ndev) { | |
866 | rc = -EIO; | |
867 | goto err; | |
868 | } | |
869 | ||
870 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
871 | ||
872 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
873 | GFP_KERNEL); | |
874 | if (!nt->qps) { | |
875 | rc = -ENOMEM; | |
876 | goto err1; | |
877 | } | |
878 | ||
879 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
880 | ||
881 | for (i = 0; i < nt->max_qps; i++) | |
882 | ntb_transport_init_queue(nt, i); | |
883 | ||
884 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 885 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
886 | |
887 | rc = ntb_register_event_callback(nt->ndev, | |
888 | ntb_transport_event_callback); | |
889 | if (rc) | |
890 | goto err2; | |
891 | ||
892 | INIT_LIST_HEAD(&nt->client_devs); | |
893 | rc = ntb_bus_init(nt); | |
894 | if (rc) | |
895 | goto err3; | |
896 | ||
897 | if (ntb_hw_link_status(nt->ndev)) | |
898 | schedule_delayed_work(&nt->link_work, 0); | |
899 | ||
900 | return 0; | |
901 | ||
902 | err3: | |
903 | ntb_unregister_event_callback(nt->ndev); | |
904 | err2: | |
905 | kfree(nt->qps); | |
906 | err1: | |
907 | ntb_unregister_transport(nt->ndev); | |
908 | err: | |
909 | debugfs_remove_recursive(nt->debugfs_dir); | |
910 | kfree(nt); | |
911 | return rc; | |
912 | } | |
913 | ||
914 | void ntb_transport_free(void *transport) | |
915 | { | |
916 | struct ntb_transport *nt = transport; | |
917 | struct pci_dev *pdev; | |
918 | int i; | |
919 | ||
920 | nt->transport_link = NTB_LINK_DOWN; | |
921 | ||
922 | /* verify that all the qp's are freed */ | |
923 | for (i = 0; i < nt->max_qps; i++) | |
924 | if (!test_bit(i, &nt->qp_bitmap)) | |
925 | ntb_transport_free_queue(&nt->qps[i]); | |
926 | ||
927 | ntb_bus_remove(nt); | |
928 | ||
929 | cancel_delayed_work_sync(&nt->link_work); | |
930 | ||
931 | debugfs_remove_recursive(nt->debugfs_dir); | |
932 | ||
933 | ntb_unregister_event_callback(nt->ndev); | |
934 | ||
935 | pdev = ntb_query_pdev(nt->ndev); | |
936 | ||
937 | for (i = 0; i < NTB_NUM_MW; i++) | |
113fc505 | 938 | ntb_free_mw(nt, i); |
fce8a7bb JM |
939 | |
940 | kfree(nt->qps); | |
941 | ntb_unregister_transport(nt->ndev); | |
942 | kfree(nt); | |
943 | } | |
944 | ||
945 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
946 | struct ntb_queue_entry *entry, void *offset) | |
947 | { | |
448c6fb3 JM |
948 | void *cb_data = entry->cb_data; |
949 | unsigned int len = entry->len; | |
fce8a7bb | 950 | |
448c6fb3 | 951 | memcpy(entry->buf, offset, entry->len); |
fce8a7bb JM |
952 | |
953 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
954 | |
955 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
956 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
957 | } |
958 | ||
959 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
960 | { | |
961 | struct ntb_payload_header *hdr; | |
962 | struct ntb_queue_entry *entry; | |
963 | void *offset; | |
964 | ||
793c20e9 JM |
965 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
966 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
967 | ||
fce8a7bb JM |
968 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
969 | if (!entry) { | |
fce8a7bb | 970 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 971 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
972 | hdr->ver, hdr->len, hdr->flags); |
973 | qp->rx_err_no_buf++; | |
974 | return -ENOMEM; | |
975 | } | |
976 | ||
fce8a7bb JM |
977 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
978 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 979 | &qp->rx_pend_q); |
fce8a7bb JM |
980 | qp->rx_ring_empty++; |
981 | return -EAGAIN; | |
982 | } | |
983 | ||
74465645 | 984 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 985 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 986 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
987 | qp->qp_num, qp->rx_pkts, hdr->ver); |
988 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 989 | &qp->rx_pend_q); |
fce8a7bb JM |
990 | qp->rx_err_ver++; |
991 | return -EIO; | |
992 | } | |
993 | ||
994 | if (hdr->flags & LINK_DOWN_FLAG) { | |
995 | ntb_qp_link_down(qp); | |
996 | ||
997 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 998 | &qp->rx_pend_q); |
fce8a7bb JM |
999 | goto out; |
1000 | } | |
1001 | ||
1002 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1003 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1004 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1005 | |
793c20e9 JM |
1006 | if (hdr->len <= entry->len) { |
1007 | entry->len = hdr->len; | |
fce8a7bb | 1008 | ntb_rx_copy_task(qp, entry, offset); |
793c20e9 | 1009 | } else { |
fce8a7bb | 1010 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, |
f766755c | 1011 | &qp->rx_pend_q); |
fce8a7bb | 1012 | |
fce8a7bb JM |
1013 | qp->rx_err_oflow++; |
1014 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1015 | "RX overflow! Wanted %d got %d\n", | |
1016 | hdr->len, entry->len); | |
1017 | } | |
1018 | ||
1019 | qp->rx_bytes += hdr->len; | |
1020 | qp->rx_pkts++; | |
1021 | ||
1022 | out: | |
793c20e9 JM |
1023 | /* Ensure that the data is fully copied out before clearing the flag */ |
1024 | wmb(); | |
1025 | hdr->flags = 0; | |
74465645 | 1026 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 JM |
1027 | |
1028 | qp->rx_index++; | |
1029 | qp->rx_index %= qp->rx_max_entry; | |
fce8a7bb JM |
1030 | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static void ntb_transport_rx(unsigned long data) | |
1035 | { | |
1036 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
1037 | int rc; | |
1038 | ||
1039 | do { | |
1040 | rc = ntb_process_rxc(qp); | |
1041 | } while (!rc); | |
1042 | } | |
1043 | ||
1044 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1045 | { | |
1046 | struct ntb_transport_qp *qp = data; | |
1047 | ||
1048 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1049 | __func__, db_num); | |
1050 | ||
1051 | tasklet_schedule(&qp->rx_work); | |
1052 | } | |
1053 | ||
1054 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1055 | struct ntb_queue_entry *entry, | |
74465645 | 1056 | void __iomem *offset) |
fce8a7bb | 1057 | { |
74465645 | 1058 | struct ntb_payload_header __iomem *hdr; |
fce8a7bb | 1059 | |
fce8a7bb JM |
1060 | memcpy_toio(offset, entry->buf, entry->len); |
1061 | ||
ef114ed5 | 1062 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
74465645 JM |
1063 | iowrite32(entry->len, &hdr->len); |
1064 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
fce8a7bb JM |
1065 | |
1066 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1067 | wmb(); |
74465645 | 1068 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb JM |
1069 | |
1070 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1071 | ||
1072 | /* The entry length can only be zero if the packet is intended to be a | |
1073 | * "link down" or similar. Since no payload is being sent in these | |
1074 | * cases, there is nothing to add to the completion queue. | |
1075 | */ | |
1076 | if (entry->len > 0) { | |
1077 | qp->tx_bytes += entry->len; | |
1078 | ||
1079 | if (qp->tx_handler) | |
1080 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1081 | entry->len); | |
1082 | } | |
1083 | ||
1084 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1085 | } | |
1086 | ||
1087 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1088 | struct ntb_queue_entry *entry) | |
1089 | { | |
74465645 | 1090 | void __iomem *offset; |
fce8a7bb | 1091 | |
793c20e9 | 1092 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
fce8a7bb | 1093 | |
793c20e9 JM |
1094 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %u, entry len %d flags %x buff %p\n", |
1095 | qp->tx_pkts, offset, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1096 | entry->buf); |
793c20e9 | 1097 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1098 | qp->tx_ring_full++; |
1099 | return -EAGAIN; | |
1100 | } | |
1101 | ||
ef114ed5 | 1102 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1103 | if (qp->tx_handler) |
1104 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1105 | ||
1106 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1107 | &qp->tx_free_q); | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | ntb_tx_copy_task(qp, entry, offset); | |
1112 | ||
793c20e9 JM |
1113 | qp->tx_index++; |
1114 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1115 | |
1116 | qp->tx_pkts++; | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1122 | { | |
1123 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1124 | struct ntb_queue_entry *entry; | |
1125 | int i, rc; | |
1126 | ||
1127 | if (qp->qp_link == NTB_LINK_DOWN) | |
1128 | return; | |
1129 | ||
1130 | qp->qp_link = NTB_LINK_DOWN; | |
1131 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1132 | ||
1133 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1134 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1135 | if (entry) |
1136 | break; | |
1137 | msleep(100); | |
1138 | } | |
1139 | ||
1140 | if (!entry) | |
1141 | return; | |
1142 | ||
1143 | entry->cb_data = NULL; | |
1144 | entry->buf = NULL; | |
1145 | entry->len = 0; | |
1146 | entry->flags = LINK_DOWN_FLAG; | |
1147 | ||
1148 | rc = ntb_process_tx(qp, entry); | |
1149 | if (rc) | |
1150 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1151 | qp->qp_num); | |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1156 | * @rx_handler: receive callback function | |
1157 | * @tx_handler: transmit callback function | |
1158 | * @event_handler: event callback function | |
1159 | * | |
1160 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1161 | * routine for both transmit and receive. The receive callback routine will be | |
1162 | * used to pass up data when the transport has received it on the queue. The | |
1163 | * transmit callback routine will be called when the transport has completed the | |
1164 | * transmission of the data on the queue and the data is ready to be freed. | |
1165 | * | |
1166 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1167 | */ | |
1168 | struct ntb_transport_qp * | |
1169 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1170 | const struct ntb_queue_handlers *handlers) | |
1171 | { | |
1172 | struct ntb_queue_entry *entry; | |
1173 | struct ntb_transport_qp *qp; | |
1174 | struct ntb_transport *nt; | |
1175 | unsigned int free_queue; | |
1176 | int rc, i; | |
1177 | ||
1178 | nt = ntb_find_transport(pdev); | |
1179 | if (!nt) | |
1180 | goto err; | |
1181 | ||
1182 | free_queue = ffs(nt->qp_bitmap); | |
1183 | if (!free_queue) | |
1184 | goto err; | |
1185 | ||
1186 | /* decrement free_queue to make it zero based */ | |
1187 | free_queue--; | |
1188 | ||
1189 | clear_bit(free_queue, &nt->qp_bitmap); | |
1190 | ||
1191 | qp = &nt->qps[free_queue]; | |
1192 | qp->cb_data = data; | |
1193 | qp->rx_handler = handlers->rx_handler; | |
1194 | qp->tx_handler = handlers->tx_handler; | |
1195 | qp->event_handler = handlers->event_handler; | |
1196 | ||
1197 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1198 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1199 | if (!entry) | |
1200 | goto err1; | |
1201 | ||
1202 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
f766755c | 1203 | &qp->rx_free_q); |
fce8a7bb JM |
1204 | } |
1205 | ||
1206 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1207 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1208 | if (!entry) | |
1209 | goto err2; | |
1210 | ||
1211 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
f766755c | 1212 | &qp->tx_free_q); |
fce8a7bb JM |
1213 | } |
1214 | ||
1215 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1216 | ||
1217 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1218 | ntb_transport_rxc_db); | |
1219 | if (rc) | |
1220 | goto err3; | |
1221 | ||
1222 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1223 | ||
1224 | return qp; | |
1225 | ||
1226 | err3: | |
1227 | tasklet_disable(&qp->rx_work); | |
1228 | err2: | |
f766755c | 1229 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1230 | kfree(entry); |
1231 | err1: | |
f766755c | 1232 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1233 | kfree(entry); |
1234 | set_bit(free_queue, &nt->qp_bitmap); | |
1235 | err: | |
1236 | return NULL; | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1239 | ||
1240 | /** | |
1241 | * ntb_transport_free_queue - Frees NTB transport queue | |
1242 | * @qp: NTB queue to be freed | |
1243 | * | |
1244 | * Frees NTB transport queue | |
1245 | */ | |
1246 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1247 | { | |
186f27ff | 1248 | struct pci_dev *pdev; |
fce8a7bb JM |
1249 | struct ntb_queue_entry *entry; |
1250 | ||
1251 | if (!qp) | |
1252 | return; | |
1253 | ||
186f27ff JM |
1254 | pdev = ntb_query_pdev(qp->ndev); |
1255 | ||
fce8a7bb JM |
1256 | cancel_delayed_work_sync(&qp->link_work); |
1257 | ||
1258 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1259 | tasklet_disable(&qp->rx_work); | |
1260 | ||
f766755c | 1261 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1262 | kfree(entry); |
1263 | ||
f766755c | 1264 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1265 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1266 | kfree(entry); | |
1267 | } | |
1268 | ||
f766755c | 1269 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1270 | kfree(entry); |
1271 | ||
1272 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1273 | ||
1274 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1275 | } | |
1276 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1277 | ||
1278 | /** | |
1279 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1280 | * @qp: NTB queue to be freed | |
1281 | * @len: pointer to variable to write enqueued buffers length | |
1282 | * | |
1283 | * Dequeues unused buffers from receive queue. Should only be used during | |
1284 | * shutdown of qp. | |
1285 | * | |
1286 | * RETURNS: NULL error value on error, or void* for success. | |
1287 | */ | |
1288 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1289 | { | |
1290 | struct ntb_queue_entry *entry; | |
1291 | void *buf; | |
1292 | ||
1293 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1294 | return NULL; | |
1295 | ||
1296 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1297 | if (!entry) | |
1298 | return NULL; | |
1299 | ||
1300 | buf = entry->cb_data; | |
1301 | *len = entry->len; | |
1302 | ||
f766755c | 1303 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1304 | |
1305 | return buf; | |
1306 | } | |
1307 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1308 | ||
1309 | /** | |
1310 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1311 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1312 | * @cb: per buffer pointer for callback function to use | |
1313 | * @data: pointer to data buffer that incoming packets will be copied into | |
1314 | * @len: length of the data buffer | |
1315 | * | |
1316 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1317 | * payload can be received into. | |
1318 | * | |
1319 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1320 | */ | |
1321 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1322 | unsigned int len) | |
1323 | { | |
1324 | struct ntb_queue_entry *entry; | |
1325 | ||
1326 | if (!qp) | |
1327 | return -EINVAL; | |
1328 | ||
1329 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1330 | if (!entry) | |
1331 | return -ENOMEM; | |
1332 | ||
1333 | entry->cb_data = cb; | |
1334 | entry->buf = data; | |
1335 | entry->len = len; | |
1336 | ||
f766755c | 1337 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1338 | |
1339 | return 0; | |
1340 | } | |
1341 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1342 | ||
1343 | /** | |
1344 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1345 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1346 | * @cb: per buffer pointer for callback function to use | |
1347 | * @data: pointer to data buffer that will be sent | |
1348 | * @len: length of the data buffer | |
1349 | * | |
1350 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1351 | * payload will be transmitted. This assumes that a lock is behing held to | |
1352 | * serialize access to the qp. | |
1353 | * | |
1354 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1355 | */ | |
1356 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1357 | unsigned int len) | |
1358 | { | |
1359 | struct ntb_queue_entry *entry; | |
1360 | int rc; | |
1361 | ||
1362 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1363 | return -EINVAL; | |
1364 | ||
1365 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1366 | if (!entry) | |
1367 | return -ENOMEM; | |
1368 | ||
1369 | entry->cb_data = cb; | |
1370 | entry->buf = data; | |
1371 | entry->len = len; | |
1372 | entry->flags = 0; | |
1373 | ||
1374 | rc = ntb_process_tx(qp, entry); | |
1375 | if (rc) | |
1376 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1377 | &qp->tx_free_q); | |
1378 | ||
1379 | return rc; | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1382 | ||
1383 | /** | |
1384 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1385 | * @qp: NTB transport layer queue to be enabled | |
1386 | * | |
1387 | * Notify NTB transport layer of client readiness to use queue | |
1388 | */ | |
1389 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1390 | { | |
1391 | if (!qp) | |
1392 | return; | |
1393 | ||
1394 | qp->client_ready = NTB_LINK_UP; | |
1395 | ||
1396 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1397 | schedule_delayed_work(&qp->link_work, 0); | |
1398 | } | |
1399 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1400 | ||
1401 | /** | |
1402 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1403 | * @qp: NTB transport layer queue to be disabled | |
1404 | * | |
1405 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1406 | * transport queue specified. It is the client's responsibility to ensure all | |
1407 | * entries on queue are purged or otherwise handled appropraitely. | |
1408 | */ | |
1409 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1410 | { | |
186f27ff | 1411 | struct pci_dev *pdev; |
fce8a7bb JM |
1412 | int rc, val; |
1413 | ||
1414 | if (!qp) | |
1415 | return; | |
1416 | ||
186f27ff | 1417 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1418 | qp->client_ready = NTB_LINK_DOWN; |
1419 | ||
1420 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1421 | if (rc) { | |
1422 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1427 | val & ~(1 << qp->qp_num)); | |
1428 | if (rc) | |
1429 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1430 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1431 | ||
1432 | if (qp->qp_link == NTB_LINK_UP) | |
1433 | ntb_send_link_down(qp); | |
1434 | else | |
1435 | cancel_delayed_work_sync(&qp->link_work); | |
1436 | } | |
1437 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1438 | ||
1439 | /** | |
1440 | * ntb_transport_link_query - Query transport link state | |
1441 | * @qp: NTB transport layer queue to be queried | |
1442 | * | |
1443 | * Query connectivity to the remote system of the NTB transport queue | |
1444 | * | |
1445 | * RETURNS: true for link up or false for link down | |
1446 | */ | |
1447 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1448 | { | |
186f27ff JM |
1449 | if (!qp) |
1450 | return false; | |
1451 | ||
fce8a7bb JM |
1452 | return qp->qp_link == NTB_LINK_UP; |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1455 | ||
1456 | /** | |
1457 | * ntb_transport_qp_num - Query the qp number | |
1458 | * @qp: NTB transport layer queue to be queried | |
1459 | * | |
1460 | * Query qp number of the NTB transport queue | |
1461 | * | |
1462 | * RETURNS: a zero based number specifying the qp number | |
1463 | */ | |
1464 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1465 | { | |
186f27ff JM |
1466 | if (!qp) |
1467 | return 0; | |
1468 | ||
fce8a7bb JM |
1469 | return qp->qp_num; |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1472 | ||
1473 | /** | |
1474 | * ntb_transport_max_size - Query the max payload size of a qp | |
1475 | * @qp: NTB transport layer queue to be queried | |
1476 | * | |
1477 | * Query the maximum payload size permissible on the given qp | |
1478 | * | |
1479 | * RETURNS: the max payload size of a qp | |
1480 | */ | |
ef114ed5 | 1481 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1482 | { |
186f27ff JM |
1483 | if (!qp) |
1484 | return 0; | |
1485 | ||
ef114ed5 | 1486 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1487 | } |
1488 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |