Commit | Line | Data |
---|---|---|
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; |
ef114ed5 | 493 | qp->rx_max_frame = min(transport_mtu, rx_size); |
793c20e9 JM |
494 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
495 | qp->rx_index = 0; | |
496 | ||
497 | qp->remote_rx_info->entry = qp->rx_max_entry; | |
fce8a7bb | 498 | |
ef114ed5 | 499 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
500 | for (i = 0; i < qp->rx_max_entry; i++) { |
501 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
502 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 503 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 504 | } |
fce8a7bb JM |
505 | |
506 | qp->rx_pkts = 0; | |
507 | qp->tx_pkts = 0; | |
508 | } | |
509 | ||
510 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) | |
511 | { | |
512 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
513 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb JM |
514 | |
515 | /* Alloc memory for receiving data. Must be 4k aligned */ | |
516 | mw->size = ALIGN(size, 4096); | |
517 | ||
518 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
519 | GFP_KERNEL); | |
520 | if (!mw->virt_addr) { | |
521 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", | |
522 | (int) mw->size); | |
523 | return -ENOMEM; | |
524 | } | |
525 | ||
fce8a7bb JM |
526 | /* Notify HW the memory location of the receive buffer */ |
527 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
113fc505 JM |
532 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
533 | { | |
534 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
535 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
536 | ||
537 | if (!mw->virt_addr) | |
538 | return; | |
539 | ||
540 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
541 | mw->virt_addr = NULL; | |
542 | } | |
543 | ||
7b4f2d3c | 544 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 545 | { |
7b4f2d3c JM |
546 | struct ntb_transport_qp *qp = container_of(work, |
547 | struct ntb_transport_qp, | |
548 | link_cleanup); | |
fce8a7bb JM |
549 | struct ntb_transport *nt = qp->transport; |
550 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
551 | ||
552 | if (qp->qp_link == NTB_LINK_DOWN) { | |
553 | cancel_delayed_work_sync(&qp->link_work); | |
554 | return; | |
555 | } | |
556 | ||
557 | if (qp->event_handler) | |
558 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
559 | ||
560 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
561 | qp->qp_link = NTB_LINK_DOWN; | |
562 | ||
563 | if (nt->transport_link == NTB_LINK_UP) | |
564 | schedule_delayed_work(&qp->link_work, | |
565 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
566 | } | |
567 | ||
7b4f2d3c JM |
568 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
569 | { | |
570 | schedule_work(&qp->link_cleanup); | |
571 | } | |
572 | ||
573 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 574 | { |
7b4f2d3c JM |
575 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
576 | link_cleanup); | |
fce8a7bb JM |
577 | int i; |
578 | ||
579 | if (nt->transport_link == NTB_LINK_DOWN) | |
580 | cancel_delayed_work_sync(&nt->link_work); | |
581 | else | |
582 | nt->transport_link = NTB_LINK_DOWN; | |
583 | ||
584 | /* Pass along the info to any clients */ | |
585 | for (i = 0; i < nt->max_qps; i++) | |
586 | if (!test_bit(i, &nt->qp_bitmap)) | |
587 | ntb_qp_link_down(&nt->qps[i]); | |
588 | ||
589 | /* The scratchpad registers keep the values if the remote side | |
590 | * goes down, blast them now to give them a sane value the next | |
591 | * time they are accessed | |
592 | */ | |
593 | for (i = 0; i < MAX_SPAD; i++) | |
594 | ntb_write_local_spad(nt->ndev, i, 0); | |
595 | } | |
596 | ||
597 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
598 | { | |
599 | struct ntb_transport *nt = data; | |
600 | ||
601 | switch (event) { | |
602 | case NTB_EVENT_HW_LINK_UP: | |
603 | schedule_delayed_work(&nt->link_work, 0); | |
604 | break; | |
605 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 606 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
607 | break; |
608 | default: | |
609 | BUG(); | |
610 | } | |
611 | } | |
612 | ||
613 | static void ntb_transport_link_work(struct work_struct *work) | |
614 | { | |
615 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
616 | link_work.work); | |
617 | struct ntb_device *ndev = nt->ndev; | |
618 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
619 | u32 val; | |
620 | int rc, i; | |
621 | ||
113fc505 JM |
622 | /* send the local info, in the opposite order of the way we read it */ |
623 | for (i = 0; i < NTB_NUM_MW; i++) { | |
624 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), | |
625 | ntb_get_mw_size(ndev, i) >> 32); | |
626 | if (rc) { | |
627 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
628 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
629 | MW0_SZ_HIGH + (i * 2)); | |
630 | goto out; | |
631 | } | |
fce8a7bb | 632 | |
113fc505 JM |
633 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
634 | (u32) ntb_get_mw_size(ndev, i)); | |
635 | if (rc) { | |
636 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
637 | (u32) ntb_get_mw_size(ndev, i), | |
638 | MW0_SZ_LOW + (i * 2)); | |
639 | goto out; | |
640 | } | |
fce8a7bb JM |
641 | } |
642 | ||
113fc505 | 643 | rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW); |
fce8a7bb JM |
644 | if (rc) { |
645 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 646 | NTB_NUM_MW, NUM_MWS); |
fce8a7bb JM |
647 | goto out; |
648 | } | |
649 | ||
650 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
651 | if (rc) { | |
652 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
653 | nt->max_qps, NUM_QPS); | |
654 | goto out; | |
655 | } | |
656 | ||
113fc505 | 657 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
658 | if (rc) { |
659 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 660 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
661 | goto out; |
662 | } | |
663 | ||
664 | /* Query the remote side for its info */ | |
665 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
666 | if (rc) { | |
667 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
668 | goto out; | |
669 | } | |
670 | ||
671 | if (val != NTB_TRANSPORT_VERSION) | |
672 | goto out; | |
673 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
674 | ||
675 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
676 | if (rc) { | |
677 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
678 | goto out; | |
679 | } | |
680 | ||
681 | if (val != nt->max_qps) | |
682 | goto out; | |
683 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
684 | ||
113fc505 | 685 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 686 | if (rc) { |
113fc505 | 687 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
688 | goto out; |
689 | } | |
690 | ||
113fc505 | 691 | if (val != NTB_NUM_MW) |
fce8a7bb | 692 | goto out; |
113fc505 | 693 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 694 | |
113fc505 JM |
695 | for (i = 0; i < NTB_NUM_MW; i++) { |
696 | u64 val64; | |
fce8a7bb | 697 | |
113fc505 JM |
698 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
699 | if (rc) { | |
700 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
701 | MW0_SZ_HIGH + (i * 2)); | |
702 | goto out1; | |
703 | } | |
fce8a7bb | 704 | |
113fc505 | 705 | val64 = (u64) val << 32; |
fce8a7bb | 706 | |
113fc505 JM |
707 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
708 | if (rc) { | |
709 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
710 | MW0_SZ_LOW + (i * 2)); | |
711 | goto out1; | |
712 | } | |
713 | ||
714 | val64 |= val; | |
715 | ||
716 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
717 | ||
718 | rc = ntb_set_mw(nt, i, val64); | |
719 | if (rc) | |
720 | goto out1; | |
721 | } | |
fce8a7bb JM |
722 | |
723 | nt->transport_link = NTB_LINK_UP; | |
724 | ||
725 | for (i = 0; i < nt->max_qps; i++) { | |
726 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
727 | ||
728 | ntb_transport_setup_qp_mw(nt, i); | |
729 | ||
730 | if (qp->client_ready == NTB_LINK_UP) | |
731 | schedule_delayed_work(&qp->link_work, 0); | |
732 | } | |
733 | ||
734 | return; | |
735 | ||
113fc505 JM |
736 | out1: |
737 | for (i = 0; i < NTB_NUM_MW; i++) | |
738 | ntb_free_mw(nt, i); | |
fce8a7bb JM |
739 | out: |
740 | if (ntb_hw_link_status(ndev)) | |
741 | schedule_delayed_work(&nt->link_work, | |
742 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
743 | } | |
744 | ||
745 | static void ntb_qp_link_work(struct work_struct *work) | |
746 | { | |
747 | struct ntb_transport_qp *qp = container_of(work, | |
748 | struct ntb_transport_qp, | |
749 | link_work.work); | |
750 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
751 | struct ntb_transport *nt = qp->transport; | |
752 | int rc, val; | |
753 | ||
754 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
755 | ||
756 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
757 | if (rc) { | |
758 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
759 | return; | |
760 | } | |
761 | ||
762 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
763 | if (rc) | |
764 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
765 | val | 1 << qp->qp_num, QP_LINKS); | |
766 | ||
767 | /* query remote spad for qp ready bits */ | |
768 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
769 | if (rc) | |
770 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
771 | ||
772 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
773 | ||
774 | /* See if the remote side is up */ | |
775 | if (1 << qp->qp_num & val) { | |
776 | qp->qp_link = NTB_LINK_UP; | |
777 | ||
778 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
779 | if (qp->event_handler) | |
780 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
781 | } else if (nt->transport_link == NTB_LINK_UP) | |
782 | schedule_delayed_work(&qp->link_work, | |
783 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
784 | } | |
785 | ||
786 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
787 | unsigned int qp_num) | |
788 | { | |
789 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
790 | unsigned int num_qps_mw, tx_size; |
791 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
792 | |
793 | qp = &nt->qps[qp_num]; | |
794 | qp->qp_num = qp_num; | |
795 | qp->transport = nt; | |
796 | qp->ndev = nt->ndev; | |
797 | qp->qp_link = NTB_LINK_DOWN; | |
798 | qp->client_ready = NTB_LINK_DOWN; | |
799 | qp->event_handler = NULL; | |
800 | ||
ef114ed5 JM |
801 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
802 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
803 | else | |
804 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
805 | ||
793c20e9 JM |
806 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
807 | qp->rx_info = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
808 | (qp_num / NTB_NUM_MW * tx_size); | |
809 | tx_size -= sizeof(struct ntb_rx_info); | |
810 | ||
cc0f868d | 811 | qp->tx_mw = qp->rx_info + 1; |
ef114ed5 | 812 | qp->tx_max_frame = min(transport_mtu, tx_size); |
793c20e9 JM |
813 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
814 | qp->tx_index = 0; | |
ef114ed5 | 815 | |
fce8a7bb JM |
816 | if (nt->debugfs_dir) { |
817 | char debugfs_name[4]; | |
818 | ||
819 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
820 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
821 | nt->debugfs_dir); | |
822 | ||
823 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
824 | qp->debugfs_dir, qp, | |
825 | &ntb_qp_debugfs_stats); | |
826 | } | |
827 | ||
828 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 829 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
830 | |
831 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
832 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
833 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
834 | ||
835 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
836 | INIT_LIST_HEAD(&qp->rx_free_q); | |
837 | INIT_LIST_HEAD(&qp->tx_free_q); | |
838 | } | |
839 | ||
840 | int ntb_transport_init(struct pci_dev *pdev) | |
841 | { | |
842 | struct ntb_transport *nt; | |
843 | int rc, i; | |
844 | ||
845 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
846 | if (!nt) | |
847 | return -ENOMEM; | |
848 | ||
849 | if (debugfs_initialized()) | |
850 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
851 | else | |
852 | nt->debugfs_dir = NULL; | |
853 | ||
854 | nt->ndev = ntb_register_transport(pdev, nt); | |
855 | if (!nt->ndev) { | |
856 | rc = -EIO; | |
857 | goto err; | |
858 | } | |
859 | ||
860 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
861 | ||
862 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
863 | GFP_KERNEL); | |
864 | if (!nt->qps) { | |
865 | rc = -ENOMEM; | |
866 | goto err1; | |
867 | } | |
868 | ||
869 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
870 | ||
871 | for (i = 0; i < nt->max_qps; i++) | |
872 | ntb_transport_init_queue(nt, i); | |
873 | ||
874 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 875 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
876 | |
877 | rc = ntb_register_event_callback(nt->ndev, | |
878 | ntb_transport_event_callback); | |
879 | if (rc) | |
880 | goto err2; | |
881 | ||
882 | INIT_LIST_HEAD(&nt->client_devs); | |
883 | rc = ntb_bus_init(nt); | |
884 | if (rc) | |
885 | goto err3; | |
886 | ||
887 | if (ntb_hw_link_status(nt->ndev)) | |
888 | schedule_delayed_work(&nt->link_work, 0); | |
889 | ||
890 | return 0; | |
891 | ||
892 | err3: | |
893 | ntb_unregister_event_callback(nt->ndev); | |
894 | err2: | |
895 | kfree(nt->qps); | |
896 | err1: | |
897 | ntb_unregister_transport(nt->ndev); | |
898 | err: | |
899 | debugfs_remove_recursive(nt->debugfs_dir); | |
900 | kfree(nt); | |
901 | return rc; | |
902 | } | |
903 | ||
904 | void ntb_transport_free(void *transport) | |
905 | { | |
906 | struct ntb_transport *nt = transport; | |
907 | struct pci_dev *pdev; | |
908 | int i; | |
909 | ||
910 | nt->transport_link = NTB_LINK_DOWN; | |
911 | ||
912 | /* verify that all the qp's are freed */ | |
913 | for (i = 0; i < nt->max_qps; i++) | |
914 | if (!test_bit(i, &nt->qp_bitmap)) | |
915 | ntb_transport_free_queue(&nt->qps[i]); | |
916 | ||
917 | ntb_bus_remove(nt); | |
918 | ||
919 | cancel_delayed_work_sync(&nt->link_work); | |
920 | ||
921 | debugfs_remove_recursive(nt->debugfs_dir); | |
922 | ||
923 | ntb_unregister_event_callback(nt->ndev); | |
924 | ||
925 | pdev = ntb_query_pdev(nt->ndev); | |
926 | ||
927 | for (i = 0; i < NTB_NUM_MW; i++) | |
113fc505 | 928 | ntb_free_mw(nt, i); |
fce8a7bb JM |
929 | |
930 | kfree(nt->qps); | |
931 | ntb_unregister_transport(nt->ndev); | |
932 | kfree(nt); | |
933 | } | |
934 | ||
935 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
936 | struct ntb_queue_entry *entry, void *offset) | |
937 | { | |
448c6fb3 JM |
938 | void *cb_data = entry->cb_data; |
939 | unsigned int len = entry->len; | |
fce8a7bb | 940 | |
448c6fb3 | 941 | memcpy(entry->buf, offset, entry->len); |
fce8a7bb JM |
942 | |
943 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
944 | |
945 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
946 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
947 | } |
948 | ||
949 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
950 | { | |
951 | struct ntb_payload_header *hdr; | |
952 | struct ntb_queue_entry *entry; | |
953 | void *offset; | |
954 | ||
793c20e9 JM |
955 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
956 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
957 | ||
fce8a7bb JM |
958 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
959 | if (!entry) { | |
fce8a7bb | 960 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 961 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
962 | hdr->ver, hdr->len, hdr->flags); |
963 | qp->rx_err_no_buf++; | |
964 | return -ENOMEM; | |
965 | } | |
966 | ||
fce8a7bb JM |
967 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
968 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 969 | &qp->rx_pend_q); |
fce8a7bb JM |
970 | qp->rx_ring_empty++; |
971 | return -EAGAIN; | |
972 | } | |
973 | ||
74465645 | 974 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 975 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 976 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
977 | qp->qp_num, qp->rx_pkts, hdr->ver); |
978 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 979 | &qp->rx_pend_q); |
fce8a7bb JM |
980 | qp->rx_err_ver++; |
981 | return -EIO; | |
982 | } | |
983 | ||
984 | if (hdr->flags & LINK_DOWN_FLAG) { | |
985 | ntb_qp_link_down(qp); | |
986 | ||
987 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 988 | &qp->rx_pend_q); |
fce8a7bb JM |
989 | goto out; |
990 | } | |
991 | ||
992 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 993 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 994 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 995 | |
793c20e9 JM |
996 | if (hdr->len <= entry->len) { |
997 | entry->len = hdr->len; | |
fce8a7bb | 998 | ntb_rx_copy_task(qp, entry, offset); |
793c20e9 | 999 | } else { |
fce8a7bb | 1000 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, |
f766755c | 1001 | &qp->rx_pend_q); |
fce8a7bb | 1002 | |
fce8a7bb JM |
1003 | qp->rx_err_oflow++; |
1004 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1005 | "RX overflow! Wanted %d got %d\n", | |
1006 | hdr->len, entry->len); | |
1007 | } | |
1008 | ||
1009 | qp->rx_bytes += hdr->len; | |
1010 | qp->rx_pkts++; | |
1011 | ||
1012 | out: | |
793c20e9 JM |
1013 | /* Ensure that the data is fully copied out before clearing the flag */ |
1014 | wmb(); | |
1015 | hdr->flags = 0; | |
74465645 | 1016 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 JM |
1017 | |
1018 | qp->rx_index++; | |
1019 | qp->rx_index %= qp->rx_max_entry; | |
fce8a7bb JM |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static void ntb_transport_rx(unsigned long data) | |
1025 | { | |
1026 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
1027 | int rc; | |
1028 | ||
1029 | do { | |
1030 | rc = ntb_process_rxc(qp); | |
1031 | } while (!rc); | |
1032 | } | |
1033 | ||
1034 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1035 | { | |
1036 | struct ntb_transport_qp *qp = data; | |
1037 | ||
1038 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1039 | __func__, db_num); | |
1040 | ||
1041 | tasklet_schedule(&qp->rx_work); | |
1042 | } | |
1043 | ||
1044 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1045 | struct ntb_queue_entry *entry, | |
74465645 | 1046 | void __iomem *offset) |
fce8a7bb | 1047 | { |
74465645 | 1048 | struct ntb_payload_header __iomem *hdr; |
fce8a7bb | 1049 | |
fce8a7bb JM |
1050 | memcpy_toio(offset, entry->buf, entry->len); |
1051 | ||
ef114ed5 | 1052 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
74465645 JM |
1053 | iowrite32(entry->len, &hdr->len); |
1054 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
fce8a7bb JM |
1055 | |
1056 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1057 | wmb(); |
74465645 | 1058 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb JM |
1059 | |
1060 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1061 | ||
1062 | /* The entry length can only be zero if the packet is intended to be a | |
1063 | * "link down" or similar. Since no payload is being sent in these | |
1064 | * cases, there is nothing to add to the completion queue. | |
1065 | */ | |
1066 | if (entry->len > 0) { | |
1067 | qp->tx_bytes += entry->len; | |
1068 | ||
1069 | if (qp->tx_handler) | |
1070 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1071 | entry->len); | |
1072 | } | |
1073 | ||
1074 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1075 | } | |
1076 | ||
1077 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1078 | struct ntb_queue_entry *entry) | |
1079 | { | |
74465645 | 1080 | void __iomem *offset; |
fce8a7bb | 1081 | |
793c20e9 | 1082 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
fce8a7bb | 1083 | |
793c20e9 JM |
1084 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %u, entry len %d flags %x buff %p\n", |
1085 | qp->tx_pkts, offset, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1086 | entry->buf); |
793c20e9 | 1087 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1088 | qp->tx_ring_full++; |
1089 | return -EAGAIN; | |
1090 | } | |
1091 | ||
ef114ed5 | 1092 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1093 | if (qp->tx_handler) |
1094 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1095 | ||
1096 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1097 | &qp->tx_free_q); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | ntb_tx_copy_task(qp, entry, offset); | |
1102 | ||
793c20e9 JM |
1103 | qp->tx_index++; |
1104 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1105 | |
1106 | qp->tx_pkts++; | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1112 | { | |
1113 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1114 | struct ntb_queue_entry *entry; | |
1115 | int i, rc; | |
1116 | ||
1117 | if (qp->qp_link == NTB_LINK_DOWN) | |
1118 | return; | |
1119 | ||
1120 | qp->qp_link = NTB_LINK_DOWN; | |
1121 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1122 | ||
1123 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1124 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1125 | if (entry) |
1126 | break; | |
1127 | msleep(100); | |
1128 | } | |
1129 | ||
1130 | if (!entry) | |
1131 | return; | |
1132 | ||
1133 | entry->cb_data = NULL; | |
1134 | entry->buf = NULL; | |
1135 | entry->len = 0; | |
1136 | entry->flags = LINK_DOWN_FLAG; | |
1137 | ||
1138 | rc = ntb_process_tx(qp, entry); | |
1139 | if (rc) | |
1140 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1141 | qp->qp_num); | |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1146 | * @rx_handler: receive callback function | |
1147 | * @tx_handler: transmit callback function | |
1148 | * @event_handler: event callback function | |
1149 | * | |
1150 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1151 | * routine for both transmit and receive. The receive callback routine will be | |
1152 | * used to pass up data when the transport has received it on the queue. The | |
1153 | * transmit callback routine will be called when the transport has completed the | |
1154 | * transmission of the data on the queue and the data is ready to be freed. | |
1155 | * | |
1156 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1157 | */ | |
1158 | struct ntb_transport_qp * | |
1159 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1160 | const struct ntb_queue_handlers *handlers) | |
1161 | { | |
1162 | struct ntb_queue_entry *entry; | |
1163 | struct ntb_transport_qp *qp; | |
1164 | struct ntb_transport *nt; | |
1165 | unsigned int free_queue; | |
1166 | int rc, i; | |
1167 | ||
1168 | nt = ntb_find_transport(pdev); | |
1169 | if (!nt) | |
1170 | goto err; | |
1171 | ||
1172 | free_queue = ffs(nt->qp_bitmap); | |
1173 | if (!free_queue) | |
1174 | goto err; | |
1175 | ||
1176 | /* decrement free_queue to make it zero based */ | |
1177 | free_queue--; | |
1178 | ||
1179 | clear_bit(free_queue, &nt->qp_bitmap); | |
1180 | ||
1181 | qp = &nt->qps[free_queue]; | |
1182 | qp->cb_data = data; | |
1183 | qp->rx_handler = handlers->rx_handler; | |
1184 | qp->tx_handler = handlers->tx_handler; | |
1185 | qp->event_handler = handlers->event_handler; | |
1186 | ||
1187 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1188 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1189 | if (!entry) | |
1190 | goto err1; | |
1191 | ||
1192 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
f766755c | 1193 | &qp->rx_free_q); |
fce8a7bb JM |
1194 | } |
1195 | ||
1196 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1197 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1198 | if (!entry) | |
1199 | goto err2; | |
1200 | ||
1201 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
f766755c | 1202 | &qp->tx_free_q); |
fce8a7bb JM |
1203 | } |
1204 | ||
1205 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1206 | ||
1207 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1208 | ntb_transport_rxc_db); | |
1209 | if (rc) | |
1210 | goto err3; | |
1211 | ||
1212 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1213 | ||
1214 | return qp; | |
1215 | ||
1216 | err3: | |
1217 | tasklet_disable(&qp->rx_work); | |
1218 | err2: | |
f766755c | 1219 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1220 | kfree(entry); |
1221 | err1: | |
f766755c | 1222 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1223 | kfree(entry); |
1224 | set_bit(free_queue, &nt->qp_bitmap); | |
1225 | err: | |
1226 | return NULL; | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1229 | ||
1230 | /** | |
1231 | * ntb_transport_free_queue - Frees NTB transport queue | |
1232 | * @qp: NTB queue to be freed | |
1233 | * | |
1234 | * Frees NTB transport queue | |
1235 | */ | |
1236 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1237 | { | |
186f27ff | 1238 | struct pci_dev *pdev; |
fce8a7bb JM |
1239 | struct ntb_queue_entry *entry; |
1240 | ||
1241 | if (!qp) | |
1242 | return; | |
1243 | ||
186f27ff JM |
1244 | pdev = ntb_query_pdev(qp->ndev); |
1245 | ||
fce8a7bb JM |
1246 | cancel_delayed_work_sync(&qp->link_work); |
1247 | ||
1248 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1249 | tasklet_disable(&qp->rx_work); | |
1250 | ||
f766755c | 1251 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1252 | kfree(entry); |
1253 | ||
f766755c | 1254 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1255 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1256 | kfree(entry); | |
1257 | } | |
1258 | ||
f766755c | 1259 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1260 | kfree(entry); |
1261 | ||
1262 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1263 | ||
1264 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1265 | } | |
1266 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1267 | ||
1268 | /** | |
1269 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1270 | * @qp: NTB queue to be freed | |
1271 | * @len: pointer to variable to write enqueued buffers length | |
1272 | * | |
1273 | * Dequeues unused buffers from receive queue. Should only be used during | |
1274 | * shutdown of qp. | |
1275 | * | |
1276 | * RETURNS: NULL error value on error, or void* for success. | |
1277 | */ | |
1278 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1279 | { | |
1280 | struct ntb_queue_entry *entry; | |
1281 | void *buf; | |
1282 | ||
1283 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1284 | return NULL; | |
1285 | ||
1286 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1287 | if (!entry) | |
1288 | return NULL; | |
1289 | ||
1290 | buf = entry->cb_data; | |
1291 | *len = entry->len; | |
1292 | ||
f766755c | 1293 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1294 | |
1295 | return buf; | |
1296 | } | |
1297 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1298 | ||
1299 | /** | |
1300 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1301 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1302 | * @cb: per buffer pointer for callback function to use | |
1303 | * @data: pointer to data buffer that incoming packets will be copied into | |
1304 | * @len: length of the data buffer | |
1305 | * | |
1306 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1307 | * payload can be received into. | |
1308 | * | |
1309 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1310 | */ | |
1311 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1312 | unsigned int len) | |
1313 | { | |
1314 | struct ntb_queue_entry *entry; | |
1315 | ||
1316 | if (!qp) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1320 | if (!entry) | |
1321 | return -ENOMEM; | |
1322 | ||
1323 | entry->cb_data = cb; | |
1324 | entry->buf = data; | |
1325 | entry->len = len; | |
1326 | ||
f766755c | 1327 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1328 | |
1329 | return 0; | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1332 | ||
1333 | /** | |
1334 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1335 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1336 | * @cb: per buffer pointer for callback function to use | |
1337 | * @data: pointer to data buffer that will be sent | |
1338 | * @len: length of the data buffer | |
1339 | * | |
1340 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1341 | * payload will be transmitted. This assumes that a lock is behing held to | |
1342 | * serialize access to the qp. | |
1343 | * | |
1344 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1345 | */ | |
1346 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1347 | unsigned int len) | |
1348 | { | |
1349 | struct ntb_queue_entry *entry; | |
1350 | int rc; | |
1351 | ||
1352 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1356 | if (!entry) | |
1357 | return -ENOMEM; | |
1358 | ||
1359 | entry->cb_data = cb; | |
1360 | entry->buf = data; | |
1361 | entry->len = len; | |
1362 | entry->flags = 0; | |
1363 | ||
1364 | rc = ntb_process_tx(qp, entry); | |
1365 | if (rc) | |
1366 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1367 | &qp->tx_free_q); | |
1368 | ||
1369 | return rc; | |
1370 | } | |
1371 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1372 | ||
1373 | /** | |
1374 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1375 | * @qp: NTB transport layer queue to be enabled | |
1376 | * | |
1377 | * Notify NTB transport layer of client readiness to use queue | |
1378 | */ | |
1379 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1380 | { | |
1381 | if (!qp) | |
1382 | return; | |
1383 | ||
1384 | qp->client_ready = NTB_LINK_UP; | |
1385 | ||
1386 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1387 | schedule_delayed_work(&qp->link_work, 0); | |
1388 | } | |
1389 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1390 | ||
1391 | /** | |
1392 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1393 | * @qp: NTB transport layer queue to be disabled | |
1394 | * | |
1395 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1396 | * transport queue specified. It is the client's responsibility to ensure all | |
1397 | * entries on queue are purged or otherwise handled appropraitely. | |
1398 | */ | |
1399 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1400 | { | |
186f27ff | 1401 | struct pci_dev *pdev; |
fce8a7bb JM |
1402 | int rc, val; |
1403 | ||
1404 | if (!qp) | |
1405 | return; | |
1406 | ||
186f27ff | 1407 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1408 | qp->client_ready = NTB_LINK_DOWN; |
1409 | ||
1410 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1411 | if (rc) { | |
1412 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1413 | return; | |
1414 | } | |
1415 | ||
1416 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1417 | val & ~(1 << qp->qp_num)); | |
1418 | if (rc) | |
1419 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1420 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1421 | ||
1422 | if (qp->qp_link == NTB_LINK_UP) | |
1423 | ntb_send_link_down(qp); | |
1424 | else | |
1425 | cancel_delayed_work_sync(&qp->link_work); | |
1426 | } | |
1427 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1428 | ||
1429 | /** | |
1430 | * ntb_transport_link_query - Query transport link state | |
1431 | * @qp: NTB transport layer queue to be queried | |
1432 | * | |
1433 | * Query connectivity to the remote system of the NTB transport queue | |
1434 | * | |
1435 | * RETURNS: true for link up or false for link down | |
1436 | */ | |
1437 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1438 | { | |
186f27ff JM |
1439 | if (!qp) |
1440 | return false; | |
1441 | ||
fce8a7bb JM |
1442 | return qp->qp_link == NTB_LINK_UP; |
1443 | } | |
1444 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1445 | ||
1446 | /** | |
1447 | * ntb_transport_qp_num - Query the qp number | |
1448 | * @qp: NTB transport layer queue to be queried | |
1449 | * | |
1450 | * Query qp number of the NTB transport queue | |
1451 | * | |
1452 | * RETURNS: a zero based number specifying the qp number | |
1453 | */ | |
1454 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1455 | { | |
186f27ff JM |
1456 | if (!qp) |
1457 | return 0; | |
1458 | ||
fce8a7bb JM |
1459 | return qp->qp_num; |
1460 | } | |
1461 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1462 | ||
1463 | /** | |
1464 | * ntb_transport_max_size - Query the max payload size of a qp | |
1465 | * @qp: NTB transport layer queue to be queried | |
1466 | * | |
1467 | * Query the maximum payload size permissible on the given qp | |
1468 | * | |
1469 | * RETURNS: the max payload size of a qp | |
1470 | */ | |
ef114ed5 | 1471 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1472 | { |
186f27ff JM |
1473 | if (!qp) |
1474 | return 0; | |
1475 | ||
ef114ed5 | 1476 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1477 | } |
1478 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |