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; | |
8b19d450 | 303 | int rc, i = 0; |
fce8a7bb | 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 */ | |
8b19d450 | 321 | dev_set_name(dev, "%s%d", device_name, i); |
fce8a7bb JM |
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); | |
8b19d450 | 333 | i++; |
fce8a7bb JM |
334 | } |
335 | ||
336 | return 0; | |
337 | ||
338 | err: | |
339 | ntb_unregister_client_dev(device_name); | |
340 | ||
341 | return rc; | |
342 | } | |
343 | EXPORT_SYMBOL_GPL(ntb_register_client_dev); | |
344 | ||
345 | /** | |
346 | * ntb_register_client - Register NTB client driver | |
347 | * @drv: NTB client driver to be registered | |
348 | * | |
349 | * Register an NTB client driver with the NTB transport layer | |
350 | * | |
351 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
352 | */ | |
353 | int ntb_register_client(struct ntb_client *drv) | |
354 | { | |
355 | drv->driver.bus = &ntb_bus_type; | |
356 | ||
8222b402 JM |
357 | if (list_empty(&ntb_transport_list)) |
358 | return -ENODEV; | |
359 | ||
fce8a7bb JM |
360 | return driver_register(&drv->driver); |
361 | } | |
362 | EXPORT_SYMBOL_GPL(ntb_register_client); | |
363 | ||
364 | /** | |
365 | * ntb_unregister_client - Unregister NTB client driver | |
366 | * @drv: NTB client driver to be unregistered | |
367 | * | |
368 | * Unregister an NTB client driver with the NTB transport layer | |
369 | * | |
370 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
371 | */ | |
372 | void ntb_unregister_client(struct ntb_client *drv) | |
373 | { | |
374 | driver_unregister(&drv->driver); | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(ntb_unregister_client); | |
377 | ||
fce8a7bb JM |
378 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
379 | loff_t *offp) | |
380 | { | |
381 | struct ntb_transport_qp *qp; | |
d7237e22 | 382 | char *buf; |
fce8a7bb JM |
383 | ssize_t ret, out_offset, out_count; |
384 | ||
d7237e22 JM |
385 | out_count = 600; |
386 | ||
387 | buf = kmalloc(out_count, GFP_KERNEL); | |
388 | if (!buf) | |
389 | return -ENOMEM; | |
fce8a7bb JM |
390 | |
391 | qp = filp->private_data; | |
392 | out_offset = 0; | |
393 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
394 | "NTB QP stats\n"); | |
395 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
396 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
397 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
398 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
399 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
400 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
401 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
402 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
403 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
404 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
405 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
406 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
407 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 408 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 409 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 410 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 411 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 412 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
413 | |
414 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
415 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
416 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
417 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
418 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
419 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
420 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 421 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 422 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 423 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 424 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 425 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
426 | |
427 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
d7237e22 | 428 | "\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ? |
fce8a7bb | 429 | "Up" : "Down"); |
d7237e22 JM |
430 | if (out_offset > out_count) |
431 | out_offset = out_count; | |
fce8a7bb JM |
432 | |
433 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 434 | kfree(buf); |
fce8a7bb JM |
435 | return ret; |
436 | } | |
437 | ||
438 | static const struct file_operations ntb_qp_debugfs_stats = { | |
439 | .owner = THIS_MODULE, | |
d66d7ac2 | 440 | .open = simple_open, |
fce8a7bb JM |
441 | .read = debugfs_read, |
442 | }; | |
443 | ||
444 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
445 | struct list_head *list) | |
446 | { | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(lock, flags); | |
450 | list_add_tail(entry, list); | |
451 | spin_unlock_irqrestore(lock, flags); | |
452 | } | |
453 | ||
454 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
455 | struct list_head *list) | |
456 | { | |
457 | struct ntb_queue_entry *entry; | |
458 | unsigned long flags; | |
459 | ||
460 | spin_lock_irqsave(lock, flags); | |
461 | if (list_empty(list)) { | |
462 | entry = NULL; | |
463 | goto out; | |
464 | } | |
465 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
466 | list_del(&entry->entry); | |
467 | out: | |
468 | spin_unlock_irqrestore(lock, flags); | |
469 | ||
470 | return entry; | |
471 | } | |
472 | ||
473 | static void ntb_transport_setup_qp_mw(struct ntb_transport *nt, | |
474 | unsigned int qp_num) | |
475 | { | |
476 | struct ntb_transport_qp *qp = &nt->qps[qp_num]; | |
ef114ed5 | 477 | unsigned int rx_size, num_qps_mw; |
fce8a7bb | 478 | u8 mw_num = QP_TO_MW(qp_num); |
793c20e9 | 479 | unsigned int i; |
fce8a7bb | 480 | |
74465645 | 481 | WARN_ON(nt->mw[mw_num].virt_addr == NULL); |
fce8a7bb | 482 | |
ef114ed5 JM |
483 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
484 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
fce8a7bb JM |
485 | else |
486 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
487 | ||
793c20e9 JM |
488 | rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; |
489 | qp->remote_rx_info = nt->mw[mw_num].virt_addr + | |
490 | (qp_num / NTB_NUM_MW * rx_size); | |
491 | rx_size -= sizeof(struct ntb_rx_info); | |
492 | ||
cc0f868d | 493 | qp->rx_buff = qp->remote_rx_info + 1; |
c9d534c8 JM |
494 | /* Due to housekeeping, there must be atleast 2 buffs */ |
495 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
496 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
497 | qp->rx_index = 0; | |
498 | ||
c9d534c8 | 499 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 500 | |
ef114ed5 | 501 | /* setup the hdr offsets with 0's */ |
793c20e9 JM |
502 | for (i = 0; i < qp->rx_max_entry; i++) { |
503 | void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) - | |
504 | sizeof(struct ntb_payload_header); | |
ef114ed5 | 505 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 506 | } |
fce8a7bb JM |
507 | |
508 | qp->rx_pkts = 0; | |
509 | qp->tx_pkts = 0; | |
90f9e934 | 510 | qp->tx_index = 0; |
fce8a7bb JM |
511 | } |
512 | ||
b77b2637 JM |
513 | static void ntb_free_mw(struct ntb_transport *nt, int num_mw) |
514 | { | |
515 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
516 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
517 | ||
518 | if (!mw->virt_addr) | |
519 | return; | |
520 | ||
521 | dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr); | |
522 | mw->virt_addr = NULL; | |
523 | } | |
524 | ||
fce8a7bb JM |
525 | static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size) |
526 | { | |
527 | struct ntb_transport_mw *mw = &nt->mw[num_mw]; | |
528 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
fce8a7bb | 529 | |
b77b2637 JM |
530 | /* No need to re-setup */ |
531 | if (mw->size == ALIGN(size, 4096)) | |
532 | return 0; | |
533 | ||
534 | if (mw->size != 0) | |
535 | ntb_free_mw(nt, num_mw); | |
536 | ||
fce8a7bb JM |
537 | /* Alloc memory for receiving data. Must be 4k aligned */ |
538 | mw->size = ALIGN(size, 4096); | |
539 | ||
540 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr, | |
541 | GFP_KERNEL); | |
542 | if (!mw->virt_addr) { | |
b77b2637 | 543 | mw->size = 0; |
fce8a7bb JM |
544 | dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n", |
545 | (int) mw->size); | |
546 | return -ENOMEM; | |
547 | } | |
548 | ||
fce8a7bb JM |
549 | /* Notify HW the memory location of the receive buffer */ |
550 | ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
7b4f2d3c | 555 | static void ntb_qp_link_cleanup(struct work_struct *work) |
fce8a7bb | 556 | { |
7b4f2d3c JM |
557 | struct ntb_transport_qp *qp = container_of(work, |
558 | struct ntb_transport_qp, | |
559 | link_cleanup); | |
fce8a7bb JM |
560 | struct ntb_transport *nt = qp->transport; |
561 | struct pci_dev *pdev = ntb_query_pdev(nt->ndev); | |
562 | ||
563 | if (qp->qp_link == NTB_LINK_DOWN) { | |
564 | cancel_delayed_work_sync(&qp->link_work); | |
565 | return; | |
566 | } | |
567 | ||
568 | if (qp->event_handler) | |
569 | qp->event_handler(qp->cb_data, NTB_LINK_DOWN); | |
570 | ||
571 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
572 | qp->qp_link = NTB_LINK_DOWN; | |
573 | ||
574 | if (nt->transport_link == NTB_LINK_UP) | |
575 | schedule_delayed_work(&qp->link_work, | |
576 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
577 | } | |
578 | ||
7b4f2d3c JM |
579 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
580 | { | |
581 | schedule_work(&qp->link_cleanup); | |
582 | } | |
583 | ||
584 | static void ntb_transport_link_cleanup(struct work_struct *work) | |
fce8a7bb | 585 | { |
7b4f2d3c JM |
586 | struct ntb_transport *nt = container_of(work, struct ntb_transport, |
587 | link_cleanup); | |
fce8a7bb JM |
588 | int i; |
589 | ||
590 | if (nt->transport_link == NTB_LINK_DOWN) | |
591 | cancel_delayed_work_sync(&nt->link_work); | |
592 | else | |
593 | nt->transport_link = NTB_LINK_DOWN; | |
594 | ||
595 | /* Pass along the info to any clients */ | |
596 | for (i = 0; i < nt->max_qps; i++) | |
597 | if (!test_bit(i, &nt->qp_bitmap)) | |
598 | ntb_qp_link_down(&nt->qps[i]); | |
599 | ||
600 | /* The scratchpad registers keep the values if the remote side | |
601 | * goes down, blast them now to give them a sane value the next | |
602 | * time they are accessed | |
603 | */ | |
604 | for (i = 0; i < MAX_SPAD; i++) | |
605 | ntb_write_local_spad(nt->ndev, i, 0); | |
606 | } | |
607 | ||
608 | static void ntb_transport_event_callback(void *data, enum ntb_hw_event event) | |
609 | { | |
610 | struct ntb_transport *nt = data; | |
611 | ||
612 | switch (event) { | |
613 | case NTB_EVENT_HW_LINK_UP: | |
614 | schedule_delayed_work(&nt->link_work, 0); | |
615 | break; | |
616 | case NTB_EVENT_HW_LINK_DOWN: | |
7b4f2d3c | 617 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
618 | break; |
619 | default: | |
620 | BUG(); | |
621 | } | |
622 | } | |
623 | ||
624 | static void ntb_transport_link_work(struct work_struct *work) | |
625 | { | |
626 | struct ntb_transport *nt = container_of(work, struct ntb_transport, | |
627 | link_work.work); | |
628 | struct ntb_device *ndev = nt->ndev; | |
629 | struct pci_dev *pdev = ntb_query_pdev(ndev); | |
630 | u32 val; | |
631 | int rc, i; | |
632 | ||
113fc505 JM |
633 | /* send the local info, in the opposite order of the way we read it */ |
634 | for (i = 0; i < NTB_NUM_MW; i++) { | |
635 | rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), | |
636 | ntb_get_mw_size(ndev, i) >> 32); | |
637 | if (rc) { | |
638 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
639 | (u32)(ntb_get_mw_size(ndev, i) >> 32), | |
640 | MW0_SZ_HIGH + (i * 2)); | |
641 | goto out; | |
642 | } | |
fce8a7bb | 643 | |
113fc505 JM |
644 | rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2), |
645 | (u32) ntb_get_mw_size(ndev, i)); | |
646 | if (rc) { | |
647 | dev_err(&pdev->dev, "Error writing %u to remote spad %d\n", | |
648 | (u32) ntb_get_mw_size(ndev, i), | |
649 | MW0_SZ_LOW + (i * 2)); | |
650 | goto out; | |
651 | } | |
fce8a7bb JM |
652 | } |
653 | ||
113fc505 | 654 | rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW); |
fce8a7bb JM |
655 | if (rc) { |
656 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 657 | NTB_NUM_MW, NUM_MWS); |
fce8a7bb JM |
658 | goto out; |
659 | } | |
660 | ||
661 | rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps); | |
662 | if (rc) { | |
663 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
664 | nt->max_qps, NUM_QPS); | |
665 | goto out; | |
666 | } | |
667 | ||
113fc505 | 668 | rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb JM |
669 | if (rc) { |
670 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
113fc505 | 671 | NTB_TRANSPORT_VERSION, VERSION); |
fce8a7bb JM |
672 | goto out; |
673 | } | |
674 | ||
675 | /* Query the remote side for its info */ | |
676 | rc = ntb_read_remote_spad(ndev, VERSION, &val); | |
677 | if (rc) { | |
678 | dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION); | |
679 | goto out; | |
680 | } | |
681 | ||
682 | if (val != NTB_TRANSPORT_VERSION) | |
683 | goto out; | |
684 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); | |
685 | ||
686 | rc = ntb_read_remote_spad(ndev, NUM_QPS, &val); | |
687 | if (rc) { | |
688 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS); | |
689 | goto out; | |
690 | } | |
691 | ||
692 | if (val != nt->max_qps) | |
693 | goto out; | |
694 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); | |
695 | ||
113fc505 | 696 | rc = ntb_read_remote_spad(ndev, NUM_MWS, &val); |
fce8a7bb | 697 | if (rc) { |
113fc505 | 698 | dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS); |
fce8a7bb JM |
699 | goto out; |
700 | } | |
701 | ||
113fc505 | 702 | if (val != NTB_NUM_MW) |
fce8a7bb | 703 | goto out; |
113fc505 | 704 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
fce8a7bb | 705 | |
113fc505 JM |
706 | for (i = 0; i < NTB_NUM_MW; i++) { |
707 | u64 val64; | |
fce8a7bb | 708 | |
113fc505 JM |
709 | rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val); |
710 | if (rc) { | |
711 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
712 | MW0_SZ_HIGH + (i * 2)); | |
713 | goto out1; | |
714 | } | |
fce8a7bb | 715 | |
113fc505 | 716 | val64 = (u64) val << 32; |
fce8a7bb | 717 | |
113fc505 JM |
718 | rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val); |
719 | if (rc) { | |
720 | dev_err(&pdev->dev, "Error reading remote spad %d\n", | |
721 | MW0_SZ_LOW + (i * 2)); | |
722 | goto out1; | |
723 | } | |
724 | ||
725 | val64 |= val; | |
726 | ||
727 | dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64); | |
728 | ||
729 | rc = ntb_set_mw(nt, i, val64); | |
730 | if (rc) | |
731 | goto out1; | |
732 | } | |
fce8a7bb JM |
733 | |
734 | nt->transport_link = NTB_LINK_UP; | |
735 | ||
736 | for (i = 0; i < nt->max_qps; i++) { | |
737 | struct ntb_transport_qp *qp = &nt->qps[i]; | |
738 | ||
739 | ntb_transport_setup_qp_mw(nt, i); | |
740 | ||
741 | if (qp->client_ready == NTB_LINK_UP) | |
742 | schedule_delayed_work(&qp->link_work, 0); | |
743 | } | |
744 | ||
745 | return; | |
746 | ||
113fc505 JM |
747 | out1: |
748 | for (i = 0; i < NTB_NUM_MW; i++) | |
749 | ntb_free_mw(nt, i); | |
fce8a7bb JM |
750 | out: |
751 | if (ntb_hw_link_status(ndev)) | |
752 | schedule_delayed_work(&nt->link_work, | |
753 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
754 | } | |
755 | ||
756 | static void ntb_qp_link_work(struct work_struct *work) | |
757 | { | |
758 | struct ntb_transport_qp *qp = container_of(work, | |
759 | struct ntb_transport_qp, | |
760 | link_work.work); | |
761 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
762 | struct ntb_transport *nt = qp->transport; | |
763 | int rc, val; | |
764 | ||
765 | WARN_ON(nt->transport_link != NTB_LINK_UP); | |
766 | ||
767 | rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val); | |
768 | if (rc) { | |
769 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
770 | return; | |
771 | } | |
772 | ||
773 | rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num); | |
774 | if (rc) | |
775 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
776 | val | 1 << qp->qp_num, QP_LINKS); | |
777 | ||
778 | /* query remote spad for qp ready bits */ | |
779 | rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val); | |
780 | if (rc) | |
781 | dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS); | |
782 | ||
783 | dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val); | |
784 | ||
785 | /* See if the remote side is up */ | |
786 | if (1 << qp->qp_num & val) { | |
787 | qp->qp_link = NTB_LINK_UP; | |
788 | ||
789 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); | |
790 | if (qp->event_handler) | |
791 | qp->event_handler(qp->cb_data, NTB_LINK_UP); | |
792 | } else if (nt->transport_link == NTB_LINK_UP) | |
793 | schedule_delayed_work(&qp->link_work, | |
794 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
795 | } | |
796 | ||
797 | static void ntb_transport_init_queue(struct ntb_transport *nt, | |
798 | unsigned int qp_num) | |
799 | { | |
800 | struct ntb_transport_qp *qp; | |
ef114ed5 JM |
801 | unsigned int num_qps_mw, tx_size; |
802 | u8 mw_num = QP_TO_MW(qp_num); | |
fce8a7bb JM |
803 | |
804 | qp = &nt->qps[qp_num]; | |
805 | qp->qp_num = qp_num; | |
806 | qp->transport = nt; | |
807 | qp->ndev = nt->ndev; | |
808 | qp->qp_link = NTB_LINK_DOWN; | |
809 | qp->client_ready = NTB_LINK_DOWN; | |
810 | qp->event_handler = NULL; | |
811 | ||
ef114ed5 JM |
812 | if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) |
813 | num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; | |
814 | else | |
815 | num_qps_mw = nt->max_qps / NTB_NUM_MW; | |
816 | ||
793c20e9 JM |
817 | tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw; |
818 | qp->rx_info = ntb_get_mw_vbase(nt->ndev, mw_num) + | |
819 | (qp_num / NTB_NUM_MW * tx_size); | |
820 | tx_size -= sizeof(struct ntb_rx_info); | |
821 | ||
cc0f868d | 822 | qp->tx_mw = qp->rx_info + 1; |
c9d534c8 JM |
823 | /* Due to housekeeping, there must be atleast 2 buffs */ |
824 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 825 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 826 | |
fce8a7bb JM |
827 | if (nt->debugfs_dir) { |
828 | char debugfs_name[4]; | |
829 | ||
830 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
831 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
832 | nt->debugfs_dir); | |
833 | ||
834 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
835 | qp->debugfs_dir, qp, | |
836 | &ntb_qp_debugfs_stats); | |
837 | } | |
838 | ||
839 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
7b4f2d3c | 840 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup); |
fce8a7bb JM |
841 | |
842 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
843 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
844 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
845 | ||
846 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
847 | INIT_LIST_HEAD(&qp->rx_free_q); | |
848 | INIT_LIST_HEAD(&qp->tx_free_q); | |
849 | } | |
850 | ||
851 | int ntb_transport_init(struct pci_dev *pdev) | |
852 | { | |
853 | struct ntb_transport *nt; | |
854 | int rc, i; | |
855 | ||
856 | nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL); | |
857 | if (!nt) | |
858 | return -ENOMEM; | |
859 | ||
860 | if (debugfs_initialized()) | |
861 | nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
862 | else | |
863 | nt->debugfs_dir = NULL; | |
864 | ||
865 | nt->ndev = ntb_register_transport(pdev, nt); | |
866 | if (!nt->ndev) { | |
867 | rc = -EIO; | |
868 | goto err; | |
869 | } | |
870 | ||
871 | nt->max_qps = min(nt->ndev->max_cbs, max_num_clients); | |
872 | ||
873 | nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp), | |
874 | GFP_KERNEL); | |
875 | if (!nt->qps) { | |
876 | rc = -ENOMEM; | |
877 | goto err1; | |
878 | } | |
879 | ||
880 | nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1; | |
881 | ||
882 | for (i = 0; i < nt->max_qps; i++) | |
883 | ntb_transport_init_queue(nt, i); | |
884 | ||
885 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
7b4f2d3c | 886 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup); |
fce8a7bb JM |
887 | |
888 | rc = ntb_register_event_callback(nt->ndev, | |
889 | ntb_transport_event_callback); | |
890 | if (rc) | |
891 | goto err2; | |
892 | ||
893 | INIT_LIST_HEAD(&nt->client_devs); | |
894 | rc = ntb_bus_init(nt); | |
895 | if (rc) | |
896 | goto err3; | |
897 | ||
898 | if (ntb_hw_link_status(nt->ndev)) | |
899 | schedule_delayed_work(&nt->link_work, 0); | |
900 | ||
901 | return 0; | |
902 | ||
903 | err3: | |
904 | ntb_unregister_event_callback(nt->ndev); | |
905 | err2: | |
906 | kfree(nt->qps); | |
907 | err1: | |
908 | ntb_unregister_transport(nt->ndev); | |
909 | err: | |
910 | debugfs_remove_recursive(nt->debugfs_dir); | |
911 | kfree(nt); | |
912 | return rc; | |
913 | } | |
914 | ||
915 | void ntb_transport_free(void *transport) | |
916 | { | |
917 | struct ntb_transport *nt = transport; | |
918 | struct pci_dev *pdev; | |
919 | int i; | |
920 | ||
921 | nt->transport_link = NTB_LINK_DOWN; | |
922 | ||
923 | /* verify that all the qp's are freed */ | |
924 | for (i = 0; i < nt->max_qps; i++) | |
925 | if (!test_bit(i, &nt->qp_bitmap)) | |
926 | ntb_transport_free_queue(&nt->qps[i]); | |
927 | ||
928 | ntb_bus_remove(nt); | |
929 | ||
930 | cancel_delayed_work_sync(&nt->link_work); | |
931 | ||
932 | debugfs_remove_recursive(nt->debugfs_dir); | |
933 | ||
934 | ntb_unregister_event_callback(nt->ndev); | |
935 | ||
936 | pdev = ntb_query_pdev(nt->ndev); | |
937 | ||
938 | for (i = 0; i < NTB_NUM_MW; i++) | |
113fc505 | 939 | ntb_free_mw(nt, i); |
fce8a7bb JM |
940 | |
941 | kfree(nt->qps); | |
942 | ntb_unregister_transport(nt->ndev); | |
943 | kfree(nt); | |
944 | } | |
945 | ||
946 | static void ntb_rx_copy_task(struct ntb_transport_qp *qp, | |
947 | struct ntb_queue_entry *entry, void *offset) | |
948 | { | |
448c6fb3 JM |
949 | void *cb_data = entry->cb_data; |
950 | unsigned int len = entry->len; | |
fce8a7bb | 951 | |
448c6fb3 | 952 | memcpy(entry->buf, offset, entry->len); |
fce8a7bb JM |
953 | |
954 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 JM |
955 | |
956 | if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) | |
957 | qp->rx_handler(qp, qp->cb_data, cb_data, len); | |
fce8a7bb JM |
958 | } |
959 | ||
960 | static int ntb_process_rxc(struct ntb_transport_qp *qp) | |
961 | { | |
962 | struct ntb_payload_header *hdr; | |
963 | struct ntb_queue_entry *entry; | |
964 | void *offset; | |
965 | ||
793c20e9 JM |
966 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
967 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
968 | ||
fce8a7bb JM |
969 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
970 | if (!entry) { | |
fce8a7bb | 971 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 972 | "no buffer - HDR ver %u, len %d, flags %x\n", |
fce8a7bb JM |
973 | hdr->ver, hdr->len, hdr->flags); |
974 | qp->rx_err_no_buf++; | |
975 | return -ENOMEM; | |
976 | } | |
977 | ||
fce8a7bb JM |
978 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
979 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 980 | &qp->rx_pend_q); |
fce8a7bb JM |
981 | qp->rx_ring_empty++; |
982 | return -EAGAIN; | |
983 | } | |
984 | ||
74465645 | 985 | if (hdr->ver != (u32) qp->rx_pkts) { |
fce8a7bb | 986 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, |
74465645 | 987 | "qp %d: version mismatch, expected %llu - got %u\n", |
fce8a7bb JM |
988 | qp->qp_num, qp->rx_pkts, hdr->ver); |
989 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 990 | &qp->rx_pend_q); |
fce8a7bb JM |
991 | qp->rx_err_ver++; |
992 | return -EIO; | |
993 | } | |
994 | ||
995 | if (hdr->flags & LINK_DOWN_FLAG) { | |
996 | ntb_qp_link_down(qp); | |
997 | ||
998 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, | |
f766755c | 999 | &qp->rx_pend_q); |
fce8a7bb JM |
1000 | goto out; |
1001 | } | |
1002 | ||
1003 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
74465645 | 1004 | "rx offset %u, ver %u - %d payload received, buf size %d\n", |
793c20e9 | 1005 | qp->rx_index, hdr->ver, hdr->len, entry->len); |
fce8a7bb | 1006 | |
793c20e9 JM |
1007 | if (hdr->len <= entry->len) { |
1008 | entry->len = hdr->len; | |
fce8a7bb | 1009 | ntb_rx_copy_task(qp, entry, offset); |
793c20e9 | 1010 | } else { |
fce8a7bb | 1011 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, |
f766755c | 1012 | &qp->rx_pend_q); |
fce8a7bb | 1013 | |
fce8a7bb JM |
1014 | qp->rx_err_oflow++; |
1015 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, | |
1016 | "RX overflow! Wanted %d got %d\n", | |
1017 | hdr->len, entry->len); | |
1018 | } | |
1019 | ||
1020 | qp->rx_bytes += hdr->len; | |
1021 | qp->rx_pkts++; | |
1022 | ||
1023 | out: | |
793c20e9 JM |
1024 | /* Ensure that the data is fully copied out before clearing the flag */ |
1025 | wmb(); | |
1026 | hdr->flags = 0; | |
74465645 | 1027 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 JM |
1028 | |
1029 | qp->rx_index++; | |
1030 | qp->rx_index %= qp->rx_max_entry; | |
fce8a7bb JM |
1031 | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static void ntb_transport_rx(unsigned long data) | |
1036 | { | |
1037 | struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data; | |
c336acd3 | 1038 | int rc, i; |
fce8a7bb | 1039 | |
c336acd3 JM |
1040 | /* Limit the number of packets processed in a single interrupt to |
1041 | * provide fairness to others | |
1042 | */ | |
1043 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1044 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1045 | if (rc) |
1046 | break; | |
1047 | } | |
fce8a7bb JM |
1048 | } |
1049 | ||
1050 | static void ntb_transport_rxc_db(void *data, int db_num) | |
1051 | { | |
1052 | struct ntb_transport_qp *qp = data; | |
1053 | ||
1054 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n", | |
1055 | __func__, db_num); | |
1056 | ||
1057 | tasklet_schedule(&qp->rx_work); | |
1058 | } | |
1059 | ||
1060 | static void ntb_tx_copy_task(struct ntb_transport_qp *qp, | |
1061 | struct ntb_queue_entry *entry, | |
74465645 | 1062 | void __iomem *offset) |
fce8a7bb | 1063 | { |
74465645 | 1064 | struct ntb_payload_header __iomem *hdr; |
fce8a7bb | 1065 | |
fce8a7bb JM |
1066 | memcpy_toio(offset, entry->buf, entry->len); |
1067 | ||
ef114ed5 | 1068 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
74465645 JM |
1069 | iowrite32(entry->len, &hdr->len); |
1070 | iowrite32((u32) qp->tx_pkts, &hdr->ver); | |
fce8a7bb JM |
1071 | |
1072 | /* Ensure that the data is fully copied out before setting the flag */ | |
842c1dde | 1073 | wmb(); |
74465645 | 1074 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb JM |
1075 | |
1076 | ntb_ring_sdb(qp->ndev, qp->qp_num); | |
1077 | ||
1078 | /* The entry length can only be zero if the packet is intended to be a | |
1079 | * "link down" or similar. Since no payload is being sent in these | |
1080 | * cases, there is nothing to add to the completion queue. | |
1081 | */ | |
1082 | if (entry->len > 0) { | |
1083 | qp->tx_bytes += entry->len; | |
1084 | ||
1085 | if (qp->tx_handler) | |
1086 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1087 | entry->len); | |
1088 | } | |
1089 | ||
1090 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1091 | } | |
1092 | ||
1093 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1094 | struct ntb_queue_entry *entry) | |
1095 | { | |
74465645 | 1096 | void __iomem *offset; |
fce8a7bb | 1097 | |
793c20e9 | 1098 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
fce8a7bb | 1099 | |
793c20e9 JM |
1100 | dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %u, entry len %d flags %x buff %p\n", |
1101 | qp->tx_pkts, offset, qp->tx_index, entry->len, entry->flags, | |
f766755c | 1102 | entry->buf); |
793c20e9 | 1103 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1104 | qp->tx_ring_full++; |
1105 | return -EAGAIN; | |
1106 | } | |
1107 | ||
ef114ed5 | 1108 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1109 | if (qp->tx_handler) |
1110 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1111 | ||
1112 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1113 | &qp->tx_free_q); | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | ntb_tx_copy_task(qp, entry, offset); | |
1118 | ||
793c20e9 JM |
1119 | qp->tx_index++; |
1120 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1121 | |
1122 | qp->tx_pkts++; | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1128 | { | |
1129 | struct pci_dev *pdev = ntb_query_pdev(qp->ndev); | |
1130 | struct ntb_queue_entry *entry; | |
1131 | int i, rc; | |
1132 | ||
1133 | if (qp->qp_link == NTB_LINK_DOWN) | |
1134 | return; | |
1135 | ||
1136 | qp->qp_link = NTB_LINK_DOWN; | |
1137 | dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num); | |
1138 | ||
1139 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1140 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1141 | if (entry) |
1142 | break; | |
1143 | msleep(100); | |
1144 | } | |
1145 | ||
1146 | if (!entry) | |
1147 | return; | |
1148 | ||
1149 | entry->cb_data = NULL; | |
1150 | entry->buf = NULL; | |
1151 | entry->len = 0; | |
1152 | entry->flags = LINK_DOWN_FLAG; | |
1153 | ||
1154 | rc = ntb_process_tx(qp, entry); | |
1155 | if (rc) | |
1156 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1157 | qp->qp_num); | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1162 | * @rx_handler: receive callback function | |
1163 | * @tx_handler: transmit callback function | |
1164 | * @event_handler: event callback function | |
1165 | * | |
1166 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1167 | * routine for both transmit and receive. The receive callback routine will be | |
1168 | * used to pass up data when the transport has received it on the queue. The | |
1169 | * transmit callback routine will be called when the transport has completed the | |
1170 | * transmission of the data on the queue and the data is ready to be freed. | |
1171 | * | |
1172 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1173 | */ | |
1174 | struct ntb_transport_qp * | |
1175 | ntb_transport_create_queue(void *data, struct pci_dev *pdev, | |
1176 | const struct ntb_queue_handlers *handlers) | |
1177 | { | |
1178 | struct ntb_queue_entry *entry; | |
1179 | struct ntb_transport_qp *qp; | |
1180 | struct ntb_transport *nt; | |
1181 | unsigned int free_queue; | |
1182 | int rc, i; | |
1183 | ||
1184 | nt = ntb_find_transport(pdev); | |
1185 | if (!nt) | |
1186 | goto err; | |
1187 | ||
1188 | free_queue = ffs(nt->qp_bitmap); | |
1189 | if (!free_queue) | |
1190 | goto err; | |
1191 | ||
1192 | /* decrement free_queue to make it zero based */ | |
1193 | free_queue--; | |
1194 | ||
1195 | clear_bit(free_queue, &nt->qp_bitmap); | |
1196 | ||
1197 | qp = &nt->qps[free_queue]; | |
1198 | qp->cb_data = data; | |
1199 | qp->rx_handler = handlers->rx_handler; | |
1200 | qp->tx_handler = handlers->tx_handler; | |
1201 | qp->event_handler = handlers->event_handler; | |
1202 | ||
1203 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1204 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1205 | if (!entry) | |
1206 | goto err1; | |
1207 | ||
1208 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, | |
f766755c | 1209 | &qp->rx_free_q); |
fce8a7bb JM |
1210 | } |
1211 | ||
1212 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1213 | entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); | |
1214 | if (!entry) | |
1215 | goto err2; | |
1216 | ||
1217 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
f766755c | 1218 | &qp->tx_free_q); |
fce8a7bb JM |
1219 | } |
1220 | ||
1221 | tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp); | |
1222 | ||
1223 | rc = ntb_register_db_callback(qp->ndev, free_queue, qp, | |
1224 | ntb_transport_rxc_db); | |
1225 | if (rc) | |
1226 | goto err3; | |
1227 | ||
1228 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1229 | ||
1230 | return qp; | |
1231 | ||
1232 | err3: | |
1233 | tasklet_disable(&qp->rx_work); | |
1234 | err2: | |
f766755c | 1235 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1236 | kfree(entry); |
1237 | err1: | |
f766755c | 1238 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1239 | kfree(entry); |
1240 | set_bit(free_queue, &nt->qp_bitmap); | |
1241 | err: | |
1242 | return NULL; | |
1243 | } | |
1244 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1245 | ||
1246 | /** | |
1247 | * ntb_transport_free_queue - Frees NTB transport queue | |
1248 | * @qp: NTB queue to be freed | |
1249 | * | |
1250 | * Frees NTB transport queue | |
1251 | */ | |
1252 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1253 | { | |
186f27ff | 1254 | struct pci_dev *pdev; |
fce8a7bb JM |
1255 | struct ntb_queue_entry *entry; |
1256 | ||
1257 | if (!qp) | |
1258 | return; | |
1259 | ||
186f27ff JM |
1260 | pdev = ntb_query_pdev(qp->ndev); |
1261 | ||
fce8a7bb JM |
1262 | cancel_delayed_work_sync(&qp->link_work); |
1263 | ||
1264 | ntb_unregister_db_callback(qp->ndev, qp->qp_num); | |
1265 | tasklet_disable(&qp->rx_work); | |
1266 | ||
f766755c | 1267 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1268 | kfree(entry); |
1269 | ||
f766755c | 1270 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1271 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1272 | kfree(entry); | |
1273 | } | |
1274 | ||
f766755c | 1275 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1276 | kfree(entry); |
1277 | ||
1278 | set_bit(qp->qp_num, &qp->transport->qp_bitmap); | |
1279 | ||
1280 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1281 | } | |
1282 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1283 | ||
1284 | /** | |
1285 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1286 | * @qp: NTB queue to be freed | |
1287 | * @len: pointer to variable to write enqueued buffers length | |
1288 | * | |
1289 | * Dequeues unused buffers from receive queue. Should only be used during | |
1290 | * shutdown of qp. | |
1291 | * | |
1292 | * RETURNS: NULL error value on error, or void* for success. | |
1293 | */ | |
1294 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1295 | { | |
1296 | struct ntb_queue_entry *entry; | |
1297 | void *buf; | |
1298 | ||
1299 | if (!qp || qp->client_ready == NTB_LINK_UP) | |
1300 | return NULL; | |
1301 | ||
1302 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1303 | if (!entry) | |
1304 | return NULL; | |
1305 | ||
1306 | buf = entry->cb_data; | |
1307 | *len = entry->len; | |
1308 | ||
f766755c | 1309 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1310 | |
1311 | return buf; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1314 | ||
1315 | /** | |
1316 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1317 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1318 | * @cb: per buffer pointer for callback function to use | |
1319 | * @data: pointer to data buffer that incoming packets will be copied into | |
1320 | * @len: length of the data buffer | |
1321 | * | |
1322 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1323 | * payload can be received into. | |
1324 | * | |
1325 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1326 | */ | |
1327 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1328 | unsigned int len) | |
1329 | { | |
1330 | struct ntb_queue_entry *entry; | |
1331 | ||
1332 | if (!qp) | |
1333 | return -EINVAL; | |
1334 | ||
1335 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1336 | if (!entry) | |
1337 | return -ENOMEM; | |
1338 | ||
1339 | entry->cb_data = cb; | |
1340 | entry->buf = data; | |
1341 | entry->len = len; | |
1342 | ||
f766755c | 1343 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1344 | |
1345 | return 0; | |
1346 | } | |
1347 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1348 | ||
1349 | /** | |
1350 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1351 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1352 | * @cb: per buffer pointer for callback function to use | |
1353 | * @data: pointer to data buffer that will be sent | |
1354 | * @len: length of the data buffer | |
1355 | * | |
1356 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
1357 | * payload will be transmitted. This assumes that a lock is behing held to | |
1358 | * serialize access to the qp. | |
1359 | * | |
1360 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1361 | */ | |
1362 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1363 | unsigned int len) | |
1364 | { | |
1365 | struct ntb_queue_entry *entry; | |
1366 | int rc; | |
1367 | ||
1368 | if (!qp || qp->qp_link != NTB_LINK_UP || !len) | |
1369 | return -EINVAL; | |
1370 | ||
1371 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
1372 | if (!entry) | |
1373 | return -ENOMEM; | |
1374 | ||
1375 | entry->cb_data = cb; | |
1376 | entry->buf = data; | |
1377 | entry->len = len; | |
1378 | entry->flags = 0; | |
1379 | ||
1380 | rc = ntb_process_tx(qp, entry); | |
1381 | if (rc) | |
1382 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1383 | &qp->tx_free_q); | |
1384 | ||
1385 | return rc; | |
1386 | } | |
1387 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1388 | ||
1389 | /** | |
1390 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1391 | * @qp: NTB transport layer queue to be enabled | |
1392 | * | |
1393 | * Notify NTB transport layer of client readiness to use queue | |
1394 | */ | |
1395 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1396 | { | |
1397 | if (!qp) | |
1398 | return; | |
1399 | ||
1400 | qp->client_ready = NTB_LINK_UP; | |
1401 | ||
1402 | if (qp->transport->transport_link == NTB_LINK_UP) | |
1403 | schedule_delayed_work(&qp->link_work, 0); | |
1404 | } | |
1405 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1406 | ||
1407 | /** | |
1408 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1409 | * @qp: NTB transport layer queue to be disabled | |
1410 | * | |
1411 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1412 | * transport queue specified. It is the client's responsibility to ensure all | |
1413 | * entries on queue are purged or otherwise handled appropraitely. | |
1414 | */ | |
1415 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1416 | { | |
186f27ff | 1417 | struct pci_dev *pdev; |
fce8a7bb JM |
1418 | int rc, val; |
1419 | ||
1420 | if (!qp) | |
1421 | return; | |
1422 | ||
186f27ff | 1423 | pdev = ntb_query_pdev(qp->ndev); |
fce8a7bb JM |
1424 | qp->client_ready = NTB_LINK_DOWN; |
1425 | ||
1426 | rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val); | |
1427 | if (rc) { | |
1428 | dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS); | |
1429 | return; | |
1430 | } | |
1431 | ||
1432 | rc = ntb_write_remote_spad(qp->ndev, QP_LINKS, | |
1433 | val & ~(1 << qp->qp_num)); | |
1434 | if (rc) | |
1435 | dev_err(&pdev->dev, "Error writing %x to remote spad %d\n", | |
1436 | val & ~(1 << qp->qp_num), QP_LINKS); | |
1437 | ||
1438 | if (qp->qp_link == NTB_LINK_UP) | |
1439 | ntb_send_link_down(qp); | |
1440 | else | |
1441 | cancel_delayed_work_sync(&qp->link_work); | |
1442 | } | |
1443 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1444 | ||
1445 | /** | |
1446 | * ntb_transport_link_query - Query transport link state | |
1447 | * @qp: NTB transport layer queue to be queried | |
1448 | * | |
1449 | * Query connectivity to the remote system of the NTB transport queue | |
1450 | * | |
1451 | * RETURNS: true for link up or false for link down | |
1452 | */ | |
1453 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1454 | { | |
186f27ff JM |
1455 | if (!qp) |
1456 | return false; | |
1457 | ||
fce8a7bb JM |
1458 | return qp->qp_link == NTB_LINK_UP; |
1459 | } | |
1460 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1461 | ||
1462 | /** | |
1463 | * ntb_transport_qp_num - Query the qp number | |
1464 | * @qp: NTB transport layer queue to be queried | |
1465 | * | |
1466 | * Query qp number of the NTB transport queue | |
1467 | * | |
1468 | * RETURNS: a zero based number specifying the qp number | |
1469 | */ | |
1470 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1471 | { | |
186f27ff JM |
1472 | if (!qp) |
1473 | return 0; | |
1474 | ||
fce8a7bb JM |
1475 | return qp->qp_num; |
1476 | } | |
1477 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1478 | ||
1479 | /** | |
1480 | * ntb_transport_max_size - Query the max payload size of a qp | |
1481 | * @qp: NTB transport layer queue to be queried | |
1482 | * | |
1483 | * Query the maximum payload size permissible on the given qp | |
1484 | * | |
1485 | * RETURNS: the max payload size of a qp | |
1486 | */ | |
ef114ed5 | 1487 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1488 | { |
186f27ff JM |
1489 | if (!qp) |
1490 | return 0; | |
1491 | ||
ef114ed5 | 1492 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); |
fce8a7bb JM |
1493 | } |
1494 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); |