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. | |
e26a5843 | 8 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of version 2 of the GNU General Public License as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * BSD LICENSE | |
15 | * | |
16 | * Copyright(c) 2012 Intel Corporation. All rights reserved. | |
e26a5843 | 17 | * Copyright (C) 2015 EMC Corporation. All Rights Reserved. |
fce8a7bb JM |
18 | * |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
22 | * | |
23 | * * Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * * Redistributions in binary form must reproduce the above copy | |
26 | * notice, this list of conditions and the following disclaimer in | |
27 | * the documentation and/or other materials provided with the | |
28 | * distribution. | |
29 | * * Neither the name of Intel Corporation nor the names of its | |
30 | * contributors may be used to endorse or promote products derived | |
31 | * from this software without specific prior written permission. | |
32 | * | |
33 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
34 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
35 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
36 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
37 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
38 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
39 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
40 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
41 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
42 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
43 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
44 | * | |
e26a5843 | 45 | * PCIe NTB Transport Linux driver |
fce8a7bb JM |
46 | * |
47 | * Contact Information: | |
48 | * Jon Mason <jon.mason@intel.com> | |
49 | */ | |
50 | #include <linux/debugfs.h> | |
51 | #include <linux/delay.h> | |
282a2fee | 52 | #include <linux/dmaengine.h> |
fce8a7bb JM |
53 | #include <linux/dma-mapping.h> |
54 | #include <linux/errno.h> | |
55 | #include <linux/export.h> | |
56 | #include <linux/interrupt.h> | |
57 | #include <linux/module.h> | |
58 | #include <linux/pci.h> | |
59 | #include <linux/slab.h> | |
60 | #include <linux/types.h> | |
06917f75 | 61 | #include <linux/uaccess.h> |
e26a5843 AH |
62 | #include "linux/ntb.h" |
63 | #include "linux/ntb_transport.h" | |
fce8a7bb | 64 | |
e26a5843 AH |
65 | #define NTB_TRANSPORT_VERSION 4 |
66 | #define NTB_TRANSPORT_VER "4" | |
67 | #define NTB_TRANSPORT_NAME "ntb_transport" | |
68 | #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB" | |
69 | ||
70 | MODULE_DESCRIPTION(NTB_TRANSPORT_DESC); | |
71 | MODULE_VERSION(NTB_TRANSPORT_VER); | |
72 | MODULE_LICENSE("Dual BSD/GPL"); | |
73 | MODULE_AUTHOR("Intel Corporation"); | |
74 | ||
75 | static unsigned long max_mw_size; | |
76 | module_param(max_mw_size, ulong, 0644); | |
77 | MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); | |
fce8a7bb | 78 | |
ef114ed5 | 79 | static unsigned int transport_mtu = 0x401E; |
fce8a7bb JM |
80 | module_param(transport_mtu, uint, 0644); |
81 | MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets"); | |
82 | ||
948d3a65 | 83 | static unsigned char max_num_clients; |
fce8a7bb JM |
84 | module_param(max_num_clients, byte, 0644); |
85 | MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients"); | |
86 | ||
282a2fee JM |
87 | static unsigned int copy_bytes = 1024; |
88 | module_param(copy_bytes, uint, 0644); | |
89 | MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA"); | |
90 | ||
e26a5843 AH |
91 | static struct dentry *nt_debugfs_dir; |
92 | ||
fce8a7bb JM |
93 | struct ntb_queue_entry { |
94 | /* ntb_queue list reference */ | |
95 | struct list_head entry; | |
e26a5843 | 96 | /* pointers to data to be transferred */ |
fce8a7bb JM |
97 | void *cb_data; |
98 | void *buf; | |
99 | unsigned int len; | |
100 | unsigned int flags; | |
282a2fee JM |
101 | |
102 | struct ntb_transport_qp *qp; | |
103 | union { | |
104 | struct ntb_payload_header __iomem *tx_hdr; | |
105 | struct ntb_payload_header *rx_hdr; | |
106 | }; | |
107 | unsigned int index; | |
fce8a7bb JM |
108 | }; |
109 | ||
793c20e9 JM |
110 | struct ntb_rx_info { |
111 | unsigned int entry; | |
112 | }; | |
113 | ||
fce8a7bb | 114 | struct ntb_transport_qp { |
e26a5843 AH |
115 | struct ntb_transport_ctx *transport; |
116 | struct ntb_dev *ndev; | |
fce8a7bb | 117 | void *cb_data; |
282a2fee | 118 | struct dma_chan *dma_chan; |
fce8a7bb JM |
119 | |
120 | bool client_ready; | |
e26a5843 AH |
121 | bool link_is_up; |
122 | ||
fce8a7bb | 123 | u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
e26a5843 | 124 | u64 qp_bit; |
fce8a7bb | 125 | |
74465645 | 126 | struct ntb_rx_info __iomem *rx_info; |
793c20e9 JM |
127 | struct ntb_rx_info *remote_rx_info; |
128 | ||
53ca4fea JM |
129 | void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
130 | void *data, int len); | |
fce8a7bb JM |
131 | struct list_head tx_free_q; |
132 | spinlock_t ntb_tx_free_q_lock; | |
74465645 | 133 | void __iomem *tx_mw; |
282a2fee | 134 | dma_addr_t tx_mw_phys; |
793c20e9 JM |
135 | unsigned int tx_index; |
136 | unsigned int tx_max_entry; | |
ef114ed5 | 137 | unsigned int tx_max_frame; |
fce8a7bb | 138 | |
53ca4fea JM |
139 | void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, |
140 | void *data, int len); | |
fce8a7bb JM |
141 | struct list_head rx_pend_q; |
142 | struct list_head rx_free_q; | |
143 | spinlock_t ntb_rx_pend_q_lock; | |
144 | spinlock_t ntb_rx_free_q_lock; | |
793c20e9 JM |
145 | void *rx_buff; |
146 | unsigned int rx_index; | |
147 | unsigned int rx_max_entry; | |
ef114ed5 | 148 | unsigned int rx_max_frame; |
282a2fee | 149 | dma_cookie_t last_cookie; |
e26a5843 | 150 | struct tasklet_struct rxc_db_work; |
fce8a7bb | 151 | |
53ca4fea | 152 | void (*event_handler)(void *data, int status); |
fce8a7bb | 153 | struct delayed_work link_work; |
7b4f2d3c | 154 | struct work_struct link_cleanup; |
fce8a7bb JM |
155 | |
156 | struct dentry *debugfs_dir; | |
157 | struct dentry *debugfs_stats; | |
158 | ||
159 | /* Stats */ | |
160 | u64 rx_bytes; | |
161 | u64 rx_pkts; | |
162 | u64 rx_ring_empty; | |
163 | u64 rx_err_no_buf; | |
164 | u64 rx_err_oflow; | |
165 | u64 rx_err_ver; | |
282a2fee JM |
166 | u64 rx_memcpy; |
167 | u64 rx_async; | |
fce8a7bb JM |
168 | u64 tx_bytes; |
169 | u64 tx_pkts; | |
170 | u64 tx_ring_full; | |
282a2fee JM |
171 | u64 tx_err_no_buf; |
172 | u64 tx_memcpy; | |
173 | u64 tx_async; | |
fce8a7bb JM |
174 | }; |
175 | ||
176 | struct ntb_transport_mw { | |
e26a5843 AH |
177 | phys_addr_t phys_addr; |
178 | resource_size_t phys_size; | |
179 | resource_size_t xlat_align; | |
180 | resource_size_t xlat_align_size; | |
181 | void __iomem *vbase; | |
182 | size_t xlat_size; | |
183 | size_t buff_size; | |
fce8a7bb JM |
184 | void *virt_addr; |
185 | dma_addr_t dma_addr; | |
186 | }; | |
187 | ||
188 | struct ntb_transport_client_dev { | |
189 | struct list_head entry; | |
e26a5843 | 190 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
191 | struct device dev; |
192 | }; | |
193 | ||
e26a5843 | 194 | struct ntb_transport_ctx { |
fce8a7bb JM |
195 | struct list_head entry; |
196 | struct list_head client_devs; | |
197 | ||
e26a5843 AH |
198 | struct ntb_dev *ndev; |
199 | ||
200 | struct ntb_transport_mw *mw_vec; | |
201 | struct ntb_transport_qp *qp_vec; | |
202 | unsigned int mw_count; | |
203 | unsigned int qp_count; | |
204 | u64 qp_bitmap; | |
205 | u64 qp_bitmap_free; | |
206 | ||
207 | bool link_is_up; | |
fce8a7bb | 208 | struct delayed_work link_work; |
7b4f2d3c | 209 | struct work_struct link_cleanup; |
fce8a7bb JM |
210 | }; |
211 | ||
212 | enum { | |
e26a5843 AH |
213 | DESC_DONE_FLAG = BIT(0), |
214 | LINK_DOWN_FLAG = BIT(1), | |
fce8a7bb JM |
215 | }; |
216 | ||
217 | struct ntb_payload_header { | |
74465645 | 218 | unsigned int ver; |
fce8a7bb JM |
219 | unsigned int len; |
220 | unsigned int flags; | |
221 | }; | |
222 | ||
223 | enum { | |
224 | VERSION = 0, | |
fce8a7bb | 225 | QP_LINKS, |
113fc505 JM |
226 | NUM_QPS, |
227 | NUM_MWS, | |
228 | MW0_SZ_HIGH, | |
229 | MW0_SZ_LOW, | |
230 | MW1_SZ_HIGH, | |
231 | MW1_SZ_LOW, | |
fce8a7bb JM |
232 | MAX_SPAD, |
233 | }; | |
234 | ||
e26a5843 AH |
235 | #define dev_client_dev(__dev) \ |
236 | container_of((__dev), struct ntb_transport_client_dev, dev) | |
237 | ||
238 | #define drv_client(__drv) \ | |
239 | container_of((__drv), struct ntb_transport_client, driver) | |
240 | ||
241 | #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) | |
fce8a7bb JM |
242 | #define NTB_QP_DEF_NUM_ENTRIES 100 |
243 | #define NTB_LINK_DOWN_TIMEOUT 10 | |
244 | ||
e26a5843 AH |
245 | static void ntb_transport_rxc_db(unsigned long data); |
246 | static const struct ntb_ctx_ops ntb_transport_ops; | |
247 | static struct ntb_client ntb_transport_client; | |
248 | ||
249 | static int ntb_transport_bus_match(struct device *dev, | |
250 | struct device_driver *drv) | |
fce8a7bb JM |
251 | { |
252 | return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); | |
253 | } | |
254 | ||
e26a5843 | 255 | static int ntb_transport_bus_probe(struct device *dev) |
fce8a7bb | 256 | { |
e26a5843 | 257 | const struct ntb_transport_client *client; |
fce8a7bb JM |
258 | int rc = -EINVAL; |
259 | ||
260 | get_device(dev); | |
e26a5843 AH |
261 | |
262 | client = drv_client(dev->driver); | |
263 | rc = client->probe(dev); | |
fce8a7bb JM |
264 | if (rc) |
265 | put_device(dev); | |
266 | ||
267 | return rc; | |
268 | } | |
269 | ||
e26a5843 | 270 | static int ntb_transport_bus_remove(struct device *dev) |
fce8a7bb | 271 | { |
e26a5843 | 272 | const struct ntb_transport_client *client; |
fce8a7bb | 273 | |
e26a5843 AH |
274 | client = drv_client(dev->driver); |
275 | client->remove(dev); | |
fce8a7bb JM |
276 | |
277 | put_device(dev); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
e26a5843 AH |
282 | static struct bus_type ntb_transport_bus = { |
283 | .name = "ntb_transport", | |
284 | .match = ntb_transport_bus_match, | |
285 | .probe = ntb_transport_bus_probe, | |
286 | .remove = ntb_transport_bus_remove, | |
fce8a7bb JM |
287 | }; |
288 | ||
289 | static LIST_HEAD(ntb_transport_list); | |
290 | ||
e26a5843 | 291 | static int ntb_bus_init(struct ntb_transport_ctx *nt) |
fce8a7bb | 292 | { |
fce8a7bb | 293 | list_add(&nt->entry, &ntb_transport_list); |
fce8a7bb JM |
294 | return 0; |
295 | } | |
296 | ||
e26a5843 | 297 | static void ntb_bus_remove(struct ntb_transport_ctx *nt) |
fce8a7bb JM |
298 | { |
299 | struct ntb_transport_client_dev *client_dev, *cd; | |
300 | ||
301 | list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) { | |
302 | dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n", | |
303 | dev_name(&client_dev->dev)); | |
304 | list_del(&client_dev->entry); | |
305 | device_unregister(&client_dev->dev); | |
306 | } | |
307 | ||
308 | list_del(&nt->entry); | |
fce8a7bb JM |
309 | } |
310 | ||
e26a5843 | 311 | static void ntb_transport_client_release(struct device *dev) |
fce8a7bb JM |
312 | { |
313 | struct ntb_transport_client_dev *client_dev; | |
fce8a7bb | 314 | |
e26a5843 | 315 | client_dev = dev_client_dev(dev); |
fce8a7bb JM |
316 | kfree(client_dev); |
317 | } | |
318 | ||
319 | /** | |
e26a5843 | 320 | * ntb_transport_unregister_client_dev - Unregister NTB client device |
fce8a7bb JM |
321 | * @device_name: Name of NTB client device |
322 | * | |
323 | * Unregister an NTB client device with the NTB transport layer | |
324 | */ | |
e26a5843 | 325 | void ntb_transport_unregister_client_dev(char *device_name) |
fce8a7bb JM |
326 | { |
327 | struct ntb_transport_client_dev *client, *cd; | |
e26a5843 | 328 | struct ntb_transport_ctx *nt; |
fce8a7bb JM |
329 | |
330 | list_for_each_entry(nt, &ntb_transport_list, entry) | |
331 | list_for_each_entry_safe(client, cd, &nt->client_devs, entry) | |
332 | if (!strncmp(dev_name(&client->dev), device_name, | |
333 | strlen(device_name))) { | |
334 | list_del(&client->entry); | |
335 | device_unregister(&client->dev); | |
336 | } | |
337 | } | |
e26a5843 | 338 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev); |
fce8a7bb JM |
339 | |
340 | /** | |
e26a5843 | 341 | * ntb_transport_register_client_dev - Register NTB client device |
fce8a7bb JM |
342 | * @device_name: Name of NTB client device |
343 | * | |
344 | * Register an NTB client device with the NTB transport layer | |
345 | */ | |
e26a5843 | 346 | int ntb_transport_register_client_dev(char *device_name) |
fce8a7bb JM |
347 | { |
348 | struct ntb_transport_client_dev *client_dev; | |
e26a5843 | 349 | struct ntb_transport_ctx *nt; |
1199aa61 | 350 | int node; |
8b19d450 | 351 | int rc, i = 0; |
fce8a7bb | 352 | |
8222b402 JM |
353 | if (list_empty(&ntb_transport_list)) |
354 | return -ENODEV; | |
355 | ||
fce8a7bb JM |
356 | list_for_each_entry(nt, &ntb_transport_list, entry) { |
357 | struct device *dev; | |
358 | ||
1199aa61 AH |
359 | node = dev_to_node(&nt->ndev->dev); |
360 | ||
361 | client_dev = kzalloc_node(sizeof(*client_dev), | |
362 | GFP_KERNEL, node); | |
fce8a7bb JM |
363 | if (!client_dev) { |
364 | rc = -ENOMEM; | |
365 | goto err; | |
366 | } | |
367 | ||
368 | dev = &client_dev->dev; | |
369 | ||
370 | /* setup and register client devices */ | |
8b19d450 | 371 | dev_set_name(dev, "%s%d", device_name, i); |
e26a5843 AH |
372 | dev->bus = &ntb_transport_bus; |
373 | dev->release = ntb_transport_client_release; | |
374 | dev->parent = &nt->ndev->dev; | |
fce8a7bb JM |
375 | |
376 | rc = device_register(dev); | |
377 | if (rc) { | |
378 | kfree(client_dev); | |
379 | goto err; | |
380 | } | |
381 | ||
382 | list_add_tail(&client_dev->entry, &nt->client_devs); | |
8b19d450 | 383 | i++; |
fce8a7bb JM |
384 | } |
385 | ||
386 | return 0; | |
387 | ||
388 | err: | |
e26a5843 | 389 | ntb_transport_unregister_client_dev(device_name); |
fce8a7bb JM |
390 | |
391 | return rc; | |
392 | } | |
e26a5843 | 393 | EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
fce8a7bb JM |
394 | |
395 | /** | |
ec110bc7 | 396 | * ntb_transport_register_client - Register NTB client driver |
fce8a7bb JM |
397 | * @drv: NTB client driver to be registered |
398 | * | |
399 | * Register an NTB client driver with the NTB transport layer | |
400 | * | |
401 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
402 | */ | |
e26a5843 | 403 | int ntb_transport_register_client(struct ntb_transport_client *drv) |
fce8a7bb | 404 | { |
e26a5843 | 405 | drv->driver.bus = &ntb_transport_bus; |
fce8a7bb | 406 | |
8222b402 JM |
407 | if (list_empty(&ntb_transport_list)) |
408 | return -ENODEV; | |
409 | ||
fce8a7bb JM |
410 | return driver_register(&drv->driver); |
411 | } | |
ec110bc7 | 412 | EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
fce8a7bb JM |
413 | |
414 | /** | |
ec110bc7 | 415 | * ntb_transport_unregister_client - Unregister NTB client driver |
fce8a7bb JM |
416 | * @drv: NTB client driver to be unregistered |
417 | * | |
418 | * Unregister an NTB client driver with the NTB transport layer | |
419 | * | |
420 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
421 | */ | |
e26a5843 | 422 | void ntb_transport_unregister_client(struct ntb_transport_client *drv) |
fce8a7bb JM |
423 | { |
424 | driver_unregister(&drv->driver); | |
425 | } | |
ec110bc7 | 426 | EXPORT_SYMBOL_GPL(ntb_transport_unregister_client); |
fce8a7bb | 427 | |
fce8a7bb JM |
428 | static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, |
429 | loff_t *offp) | |
430 | { | |
431 | struct ntb_transport_qp *qp; | |
d7237e22 | 432 | char *buf; |
fce8a7bb JM |
433 | ssize_t ret, out_offset, out_count; |
434 | ||
282a2fee | 435 | out_count = 1000; |
d7237e22 JM |
436 | |
437 | buf = kmalloc(out_count, GFP_KERNEL); | |
438 | if (!buf) | |
439 | return -ENOMEM; | |
fce8a7bb JM |
440 | |
441 | qp = filp->private_data; | |
442 | out_offset = 0; | |
443 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
444 | "NTB QP stats\n"); | |
445 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
446 | "rx_bytes - \t%llu\n", qp->rx_bytes); | |
447 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
448 | "rx_pkts - \t%llu\n", qp->rx_pkts); | |
282a2fee JM |
449 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
450 | "rx_memcpy - \t%llu\n", qp->rx_memcpy); | |
451 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
452 | "rx_async - \t%llu\n", qp->rx_async); | |
fce8a7bb JM |
453 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
454 | "rx_ring_empty - %llu\n", qp->rx_ring_empty); | |
455 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
456 | "rx_err_no_buf - %llu\n", qp->rx_err_no_buf); | |
457 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
458 | "rx_err_oflow - \t%llu\n", qp->rx_err_oflow); | |
459 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
460 | "rx_err_ver - \t%llu\n", qp->rx_err_ver); | |
461 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
793c20e9 | 462 | "rx_buff - \t%p\n", qp->rx_buff); |
fce8a7bb | 463 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 464 | "rx_index - \t%u\n", qp->rx_index); |
fce8a7bb | 465 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 466 | "rx_max_entry - \t%u\n", qp->rx_max_entry); |
fce8a7bb JM |
467 | |
468 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
469 | "tx_bytes - \t%llu\n", qp->tx_bytes); | |
470 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
471 | "tx_pkts - \t%llu\n", qp->tx_pkts); | |
282a2fee JM |
472 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
473 | "tx_memcpy - \t%llu\n", qp->tx_memcpy); | |
474 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
475 | "tx_async - \t%llu\n", qp->tx_async); | |
fce8a7bb JM |
476 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
477 | "tx_ring_full - \t%llu\n", qp->tx_ring_full); | |
282a2fee JM |
478 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
479 | "tx_err_no_buf - %llu\n", qp->tx_err_no_buf); | |
fce8a7bb | 480 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 481 | "tx_mw - \t%p\n", qp->tx_mw); |
fce8a7bb | 482 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 483 | "tx_index - \t%u\n", qp->tx_index); |
fce8a7bb | 484 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
793c20e9 | 485 | "tx_max_entry - \t%u\n", qp->tx_max_entry); |
fce8a7bb JM |
486 | |
487 | out_offset += snprintf(buf + out_offset, out_count - out_offset, | |
e26a5843 AH |
488 | "\nQP Link %s\n", |
489 | qp->link_is_up ? "Up" : "Down"); | |
d7237e22 JM |
490 | if (out_offset > out_count) |
491 | out_offset = out_count; | |
fce8a7bb JM |
492 | |
493 | ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); | |
d7237e22 | 494 | kfree(buf); |
fce8a7bb JM |
495 | return ret; |
496 | } | |
497 | ||
498 | static const struct file_operations ntb_qp_debugfs_stats = { | |
499 | .owner = THIS_MODULE, | |
d66d7ac2 | 500 | .open = simple_open, |
fce8a7bb JM |
501 | .read = debugfs_read, |
502 | }; | |
503 | ||
504 | static void ntb_list_add(spinlock_t *lock, struct list_head *entry, | |
505 | struct list_head *list) | |
506 | { | |
507 | unsigned long flags; | |
508 | ||
509 | spin_lock_irqsave(lock, flags); | |
510 | list_add_tail(entry, list); | |
511 | spin_unlock_irqrestore(lock, flags); | |
512 | } | |
513 | ||
514 | static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock, | |
53ca4fea | 515 | struct list_head *list) |
fce8a7bb JM |
516 | { |
517 | struct ntb_queue_entry *entry; | |
518 | unsigned long flags; | |
519 | ||
520 | spin_lock_irqsave(lock, flags); | |
521 | if (list_empty(list)) { | |
522 | entry = NULL; | |
523 | goto out; | |
524 | } | |
525 | entry = list_first_entry(list, struct ntb_queue_entry, entry); | |
526 | list_del(&entry->entry); | |
527 | out: | |
528 | spin_unlock_irqrestore(lock, flags); | |
529 | ||
530 | return entry; | |
531 | } | |
532 | ||
e26a5843 AH |
533 | static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
534 | unsigned int qp_num) | |
fce8a7bb | 535 | { |
e26a5843 AH |
536 | struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
537 | struct ntb_transport_mw *mw; | |
ef114ed5 | 538 | unsigned int rx_size, num_qps_mw; |
e26a5843 | 539 | unsigned int mw_num, mw_count, qp_count; |
793c20e9 | 540 | unsigned int i; |
fce8a7bb | 541 | |
e26a5843 AH |
542 | mw_count = nt->mw_count; |
543 | qp_count = nt->qp_count; | |
948d3a65 | 544 | |
e26a5843 AH |
545 | mw_num = QP_TO_MW(nt, qp_num); |
546 | mw = &nt->mw_vec[mw_num]; | |
547 | ||
548 | if (!mw->virt_addr) | |
549 | return -ENOMEM; | |
fce8a7bb | 550 | |
e26a5843 AH |
551 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
552 | num_qps_mw = qp_count / mw_count + 1; | |
fce8a7bb | 553 | else |
e26a5843 | 554 | num_qps_mw = qp_count / mw_count; |
fce8a7bb | 555 | |
e26a5843 AH |
556 | rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
557 | qp->rx_buff = mw->virt_addr + rx_size * qp_num / mw_count; | |
793c20e9 JM |
558 | rx_size -= sizeof(struct ntb_rx_info); |
559 | ||
282a2fee JM |
560 | qp->remote_rx_info = qp->rx_buff + rx_size; |
561 | ||
c9d534c8 JM |
562 | /* Due to housekeeping, there must be atleast 2 buffs */ |
563 | qp->rx_max_frame = min(transport_mtu, rx_size / 2); | |
793c20e9 JM |
564 | qp->rx_max_entry = rx_size / qp->rx_max_frame; |
565 | qp->rx_index = 0; | |
566 | ||
c9d534c8 | 567 | qp->remote_rx_info->entry = qp->rx_max_entry - 1; |
fce8a7bb | 568 | |
ef114ed5 | 569 | /* setup the hdr offsets with 0's */ |
793c20e9 | 570 | for (i = 0; i < qp->rx_max_entry; i++) { |
e26a5843 AH |
571 | void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) - |
572 | sizeof(struct ntb_payload_header)); | |
ef114ed5 | 573 | memset(offset, 0, sizeof(struct ntb_payload_header)); |
793c20e9 | 574 | } |
fce8a7bb JM |
575 | |
576 | qp->rx_pkts = 0; | |
577 | qp->tx_pkts = 0; | |
90f9e934 | 578 | qp->tx_index = 0; |
e26a5843 AH |
579 | |
580 | return 0; | |
fce8a7bb JM |
581 | } |
582 | ||
e26a5843 | 583 | static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
b77b2637 | 584 | { |
e26a5843 AH |
585 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
586 | struct pci_dev *pdev = nt->ndev->pdev; | |
b77b2637 JM |
587 | |
588 | if (!mw->virt_addr) | |
589 | return; | |
590 | ||
e26a5843 AH |
591 | ntb_mw_clear_trans(nt->ndev, num_mw); |
592 | dma_free_coherent(&pdev->dev, mw->buff_size, | |
593 | mw->virt_addr, mw->dma_addr); | |
594 | mw->xlat_size = 0; | |
595 | mw->buff_size = 0; | |
b77b2637 JM |
596 | mw->virt_addr = NULL; |
597 | } | |
598 | ||
e26a5843 AH |
599 | static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
600 | unsigned int size) | |
fce8a7bb | 601 | { |
e26a5843 AH |
602 | struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
603 | struct pci_dev *pdev = nt->ndev->pdev; | |
604 | unsigned int xlat_size, buff_size; | |
605 | int rc; | |
606 | ||
607 | xlat_size = round_up(size, mw->xlat_align_size); | |
608 | buff_size = round_up(size, mw->xlat_align); | |
fce8a7bb | 609 | |
b77b2637 | 610 | /* No need to re-setup */ |
e26a5843 | 611 | if (mw->xlat_size == xlat_size) |
b77b2637 JM |
612 | return 0; |
613 | ||
e26a5843 | 614 | if (mw->buff_size) |
b77b2637 JM |
615 | ntb_free_mw(nt, num_mw); |
616 | ||
e26a5843 AH |
617 | /* Alloc memory for receiving data. Must be aligned */ |
618 | mw->xlat_size = xlat_size; | |
619 | mw->buff_size = buff_size; | |
fce8a7bb | 620 | |
e26a5843 AH |
621 | mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
622 | &mw->dma_addr, GFP_KERNEL); | |
fce8a7bb | 623 | if (!mw->virt_addr) { |
e26a5843 AH |
624 | mw->xlat_size = 0; |
625 | mw->buff_size = 0; | |
626 | dev_err(&pdev->dev, "Unable to alloc MW buff of size %d\n", | |
627 | buff_size); | |
fce8a7bb JM |
628 | return -ENOMEM; |
629 | } | |
630 | ||
3cc5ba19 DJ |
631 | /* |
632 | * we must ensure that the memory address allocated is BAR size | |
633 | * aligned in order for the XLAT register to take the value. This | |
634 | * is a requirement of the hardware. It is recommended to setup CMA | |
635 | * for BAR sizes equal or greater than 4MB. | |
636 | */ | |
e26a5843 AH |
637 | if (!IS_ALIGNED(mw->dma_addr, mw->xlat_align)) { |
638 | dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", | |
3cc5ba19 DJ |
639 | &mw->dma_addr); |
640 | ntb_free_mw(nt, num_mw); | |
641 | return -ENOMEM; | |
642 | } | |
643 | ||
fce8a7bb | 644 | /* Notify HW the memory location of the receive buffer */ |
e26a5843 AH |
645 | rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
646 | if (rc) { | |
647 | dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); | |
648 | ntb_free_mw(nt, num_mw); | |
649 | return -EIO; | |
650 | } | |
fce8a7bb JM |
651 | |
652 | return 0; | |
653 | } | |
654 | ||
2849b5d7 AH |
655 | static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
656 | { | |
657 | qp->link_is_up = false; | |
658 | ||
659 | qp->tx_index = 0; | |
660 | qp->rx_index = 0; | |
661 | qp->rx_bytes = 0; | |
662 | qp->rx_pkts = 0; | |
663 | qp->rx_ring_empty = 0; | |
664 | qp->rx_err_no_buf = 0; | |
665 | qp->rx_err_oflow = 0; | |
666 | qp->rx_err_ver = 0; | |
667 | qp->rx_memcpy = 0; | |
668 | qp->rx_async = 0; | |
669 | qp->tx_bytes = 0; | |
670 | qp->tx_pkts = 0; | |
671 | qp->tx_ring_full = 0; | |
672 | qp->tx_err_no_buf = 0; | |
673 | qp->tx_memcpy = 0; | |
674 | qp->tx_async = 0; | |
675 | } | |
676 | ||
fca4d518 | 677 | static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
fce8a7bb | 678 | { |
e26a5843 AH |
679 | struct ntb_transport_ctx *nt = qp->transport; |
680 | struct pci_dev *pdev = nt->ndev->pdev; | |
fce8a7bb | 681 | |
e22e0b9d | 682 | dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
2849b5d7 AH |
683 | |
684 | cancel_delayed_work_sync(&qp->link_work); | |
685 | ntb_qp_link_down_reset(qp); | |
e26a5843 AH |
686 | |
687 | if (qp->event_handler) | |
688 | qp->event_handler(qp->cb_data, qp->link_is_up); | |
fca4d518 JM |
689 | } |
690 | ||
691 | static void ntb_qp_link_cleanup_work(struct work_struct *work) | |
692 | { | |
693 | struct ntb_transport_qp *qp = container_of(work, | |
694 | struct ntb_transport_qp, | |
695 | link_cleanup); | |
e26a5843 | 696 | struct ntb_transport_ctx *nt = qp->transport; |
fca4d518 JM |
697 | |
698 | ntb_qp_link_cleanup(qp); | |
fce8a7bb | 699 | |
e26a5843 | 700 | if (nt->link_is_up) |
fce8a7bb JM |
701 | schedule_delayed_work(&qp->link_work, |
702 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
703 | } | |
704 | ||
7b4f2d3c JM |
705 | static void ntb_qp_link_down(struct ntb_transport_qp *qp) |
706 | { | |
707 | schedule_work(&qp->link_cleanup); | |
708 | } | |
709 | ||
e26a5843 | 710 | static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) |
fce8a7bb | 711 | { |
e26a5843 AH |
712 | struct ntb_transport_qp *qp; |
713 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
714 | int i; |
715 | ||
e26a5843 AH |
716 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
717 | ||
fca4d518 | 718 | /* Pass along the info to any clients */ |
e26a5843 AH |
719 | for (i = 0; i < nt->qp_count; i++) |
720 | if (qp_bitmap_alloc & BIT_ULL(i)) { | |
721 | qp = &nt->qp_vec[i]; | |
722 | ntb_qp_link_cleanup(qp); | |
723 | cancel_work_sync(&qp->link_cleanup); | |
724 | cancel_delayed_work_sync(&qp->link_work); | |
725 | } | |
fca4d518 | 726 | |
e26a5843 | 727 | if (!nt->link_is_up) |
fce8a7bb | 728 | cancel_delayed_work_sync(&nt->link_work); |
fce8a7bb | 729 | |
fce8a7bb JM |
730 | /* The scratchpad registers keep the values if the remote side |
731 | * goes down, blast them now to give them a sane value the next | |
732 | * time they are accessed | |
733 | */ | |
734 | for (i = 0; i < MAX_SPAD; i++) | |
e26a5843 | 735 | ntb_spad_write(nt->ndev, i, 0); |
fce8a7bb JM |
736 | } |
737 | ||
fca4d518 JM |
738 | static void ntb_transport_link_cleanup_work(struct work_struct *work) |
739 | { | |
e26a5843 AH |
740 | struct ntb_transport_ctx *nt = |
741 | container_of(work, struct ntb_transport_ctx, link_cleanup); | |
fca4d518 JM |
742 | |
743 | ntb_transport_link_cleanup(nt); | |
744 | } | |
745 | ||
e26a5843 | 746 | static void ntb_transport_event_callback(void *data) |
fce8a7bb | 747 | { |
e26a5843 | 748 | struct ntb_transport_ctx *nt = data; |
fce8a7bb | 749 | |
e26a5843 | 750 | if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
fce8a7bb | 751 | schedule_delayed_work(&nt->link_work, 0); |
e26a5843 | 752 | else |
7b4f2d3c | 753 | schedule_work(&nt->link_cleanup); |
fce8a7bb JM |
754 | } |
755 | ||
756 | static void ntb_transport_link_work(struct work_struct *work) | |
757 | { | |
e26a5843 AH |
758 | struct ntb_transport_ctx *nt = |
759 | container_of(work, struct ntb_transport_ctx, link_work.work); | |
760 | struct ntb_dev *ndev = nt->ndev; | |
761 | struct pci_dev *pdev = ndev->pdev; | |
762 | resource_size_t size; | |
fce8a7bb | 763 | u32 val; |
e26a5843 | 764 | int rc, i, spad; |
fce8a7bb | 765 | |
113fc505 | 766 | /* send the local info, in the opposite order of the way we read it */ |
e26a5843 AH |
767 | for (i = 0; i < nt->mw_count; i++) { |
768 | size = nt->mw_vec[i].phys_size; | |
fce8a7bb | 769 | |
e26a5843 AH |
770 | if (max_mw_size && size > max_mw_size) |
771 | size = max_mw_size; | |
fce8a7bb | 772 | |
e26a5843 AH |
773 | spad = MW0_SZ_HIGH + (i * 2); |
774 | ntb_peer_spad_write(ndev, spad, (u32)(size >> 32)); | |
fce8a7bb | 775 | |
e26a5843 AH |
776 | spad = MW0_SZ_LOW + (i * 2); |
777 | ntb_peer_spad_write(ndev, spad, (u32)size); | |
fce8a7bb JM |
778 | } |
779 | ||
e26a5843 | 780 | ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
fce8a7bb | 781 | |
e26a5843 | 782 | ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
fce8a7bb | 783 | |
e26a5843 | 784 | ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
fce8a7bb | 785 | |
e26a5843 | 786 | /* Query the remote side for its info */ |
0f69a7df | 787 | val = ntb_spad_read(ndev, VERSION); |
e26a5843 AH |
788 | dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
789 | if (val != NTB_TRANSPORT_VERSION) | |
fce8a7bb | 790 | goto out; |
fce8a7bb | 791 | |
0f69a7df | 792 | val = ntb_spad_read(ndev, NUM_QPS); |
fce8a7bb | 793 | dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
e26a5843 | 794 | if (val != nt->qp_count) |
fce8a7bb | 795 | goto out; |
fce8a7bb | 796 | |
0f69a7df | 797 | val = ntb_spad_read(ndev, NUM_MWS); |
113fc505 | 798 | dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
e26a5843 AH |
799 | if (val != nt->mw_count) |
800 | goto out; | |
fce8a7bb | 801 | |
e26a5843 | 802 | for (i = 0; i < nt->mw_count; i++) { |
113fc505 | 803 | u64 val64; |
fce8a7bb | 804 | |
0f69a7df | 805 | val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
e26a5843 | 806 | val64 = (u64)val << 32; |
113fc505 | 807 | |
0f69a7df | 808 | val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
113fc505 JM |
809 | val64 |= val; |
810 | ||
e26a5843 | 811 | dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
113fc505 JM |
812 | |
813 | rc = ntb_set_mw(nt, i, val64); | |
814 | if (rc) | |
815 | goto out1; | |
816 | } | |
fce8a7bb | 817 | |
e26a5843 | 818 | nt->link_is_up = true; |
fce8a7bb | 819 | |
e26a5843 AH |
820 | for (i = 0; i < nt->qp_count; i++) { |
821 | struct ntb_transport_qp *qp = &nt->qp_vec[i]; | |
fce8a7bb JM |
822 | |
823 | ntb_transport_setup_qp_mw(nt, i); | |
824 | ||
e26a5843 | 825 | if (qp->client_ready) |
fce8a7bb JM |
826 | schedule_delayed_work(&qp->link_work, 0); |
827 | } | |
828 | ||
829 | return; | |
830 | ||
113fc505 | 831 | out1: |
e26a5843 | 832 | for (i = 0; i < nt->mw_count; i++) |
113fc505 | 833 | ntb_free_mw(nt, i); |
fce8a7bb | 834 | out: |
e26a5843 | 835 | if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
fce8a7bb JM |
836 | schedule_delayed_work(&nt->link_work, |
837 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
838 | } | |
839 | ||
840 | static void ntb_qp_link_work(struct work_struct *work) | |
841 | { | |
842 | struct ntb_transport_qp *qp = container_of(work, | |
843 | struct ntb_transport_qp, | |
844 | link_work.work); | |
e26a5843 AH |
845 | struct pci_dev *pdev = qp->ndev->pdev; |
846 | struct ntb_transport_ctx *nt = qp->transport; | |
847 | int val; | |
fce8a7bb | 848 | |
e26a5843 | 849 | WARN_ON(!nt->link_is_up); |
fce8a7bb | 850 | |
e26a5843 | 851 | val = ntb_spad_read(nt->ndev, QP_LINKS); |
fce8a7bb | 852 | |
e26a5843 | 853 | ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
fce8a7bb JM |
854 | |
855 | /* query remote spad for qp ready bits */ | |
e26a5843 | 856 | ntb_peer_spad_read(nt->ndev, QP_LINKS); |
28762289 | 857 | dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
fce8a7bb JM |
858 | |
859 | /* See if the remote side is up */ | |
e26a5843 | 860 | if (val & BIT(qp->qp_num)) { |
fce8a7bb | 861 | dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
e26a5843 AH |
862 | qp->link_is_up = true; |
863 | ||
fce8a7bb | 864 | if (qp->event_handler) |
e26a5843 AH |
865 | qp->event_handler(qp->cb_data, qp->link_is_up); |
866 | } else if (nt->link_is_up) | |
fce8a7bb JM |
867 | schedule_delayed_work(&qp->link_work, |
868 | msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); | |
869 | } | |
870 | ||
e26a5843 | 871 | static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
53ca4fea | 872 | unsigned int qp_num) |
fce8a7bb JM |
873 | { |
874 | struct ntb_transport_qp *qp; | |
e26a5843 AH |
875 | struct ntb_transport_mw *mw; |
876 | phys_addr_t mw_base; | |
877 | resource_size_t mw_size; | |
ef114ed5 | 878 | unsigned int num_qps_mw, tx_size; |
e26a5843 | 879 | unsigned int mw_num, mw_count, qp_count; |
282a2fee | 880 | u64 qp_offset; |
948d3a65 | 881 | |
e26a5843 AH |
882 | mw_count = nt->mw_count; |
883 | qp_count = nt->qp_count; | |
fce8a7bb | 884 | |
e26a5843 AH |
885 | mw_num = QP_TO_MW(nt, qp_num); |
886 | mw = &nt->mw_vec[mw_num]; | |
887 | ||
888 | qp = &nt->qp_vec[qp_num]; | |
fce8a7bb JM |
889 | qp->qp_num = qp_num; |
890 | qp->transport = nt; | |
891 | qp->ndev = nt->ndev; | |
e26a5843 | 892 | qp->client_ready = false; |
fce8a7bb | 893 | qp->event_handler = NULL; |
2849b5d7 | 894 | ntb_qp_link_down_reset(qp); |
fce8a7bb | 895 | |
e26a5843 AH |
896 | if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count) |
897 | num_qps_mw = qp_count / mw_count + 1; | |
ef114ed5 | 898 | else |
e26a5843 AH |
899 | num_qps_mw = qp_count / mw_count; |
900 | ||
901 | mw_base = nt->mw_vec[mw_num].phys_addr; | |
902 | mw_size = nt->mw_vec[mw_num].phys_size; | |
ef114ed5 | 903 | |
e26a5843 AH |
904 | tx_size = (unsigned int)mw_size / num_qps_mw; |
905 | qp_offset = tx_size * qp_num / mw_count; | |
906 | ||
907 | qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; | |
282a2fee JM |
908 | if (!qp->tx_mw) |
909 | return -EINVAL; | |
910 | ||
e26a5843 | 911 | qp->tx_mw_phys = mw_base + qp_offset; |
282a2fee JM |
912 | if (!qp->tx_mw_phys) |
913 | return -EINVAL; | |
914 | ||
793c20e9 | 915 | tx_size -= sizeof(struct ntb_rx_info); |
282a2fee | 916 | qp->rx_info = qp->tx_mw + tx_size; |
793c20e9 | 917 | |
c9d534c8 JM |
918 | /* Due to housekeeping, there must be atleast 2 buffs */ |
919 | qp->tx_max_frame = min(transport_mtu, tx_size / 2); | |
793c20e9 | 920 | qp->tx_max_entry = tx_size / qp->tx_max_frame; |
ef114ed5 | 921 | |
e26a5843 | 922 | if (nt_debugfs_dir) { |
fce8a7bb JM |
923 | char debugfs_name[4]; |
924 | ||
925 | snprintf(debugfs_name, 4, "qp%d", qp_num); | |
926 | qp->debugfs_dir = debugfs_create_dir(debugfs_name, | |
e26a5843 | 927 | nt_debugfs_dir); |
fce8a7bb JM |
928 | |
929 | qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, | |
930 | qp->debugfs_dir, qp, | |
931 | &ntb_qp_debugfs_stats); | |
e26a5843 AH |
932 | } else { |
933 | qp->debugfs_dir = NULL; | |
934 | qp->debugfs_stats = NULL; | |
fce8a7bb JM |
935 | } |
936 | ||
937 | INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work); | |
fca4d518 | 938 | INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work); |
fce8a7bb JM |
939 | |
940 | spin_lock_init(&qp->ntb_rx_pend_q_lock); | |
941 | spin_lock_init(&qp->ntb_rx_free_q_lock); | |
942 | spin_lock_init(&qp->ntb_tx_free_q_lock); | |
943 | ||
944 | INIT_LIST_HEAD(&qp->rx_pend_q); | |
945 | INIT_LIST_HEAD(&qp->rx_free_q); | |
946 | INIT_LIST_HEAD(&qp->tx_free_q); | |
282a2fee | 947 | |
e26a5843 AH |
948 | tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
949 | (unsigned long)qp); | |
950 | ||
282a2fee | 951 | return 0; |
fce8a7bb JM |
952 | } |
953 | ||
e26a5843 | 954 | static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 955 | { |
e26a5843 AH |
956 | struct ntb_transport_ctx *nt; |
957 | struct ntb_transport_mw *mw; | |
958 | unsigned int mw_count, qp_count; | |
959 | u64 qp_bitmap; | |
1199aa61 | 960 | int node; |
fce8a7bb JM |
961 | int rc, i; |
962 | ||
e26a5843 AH |
963 | if (ntb_db_is_unsafe(ndev)) |
964 | dev_dbg(&ndev->dev, | |
965 | "doorbell is unsafe, proceed anyway...\n"); | |
966 | if (ntb_spad_is_unsafe(ndev)) | |
967 | dev_dbg(&ndev->dev, | |
968 | "scratchpad is unsafe, proceed anyway...\n"); | |
969 | ||
1199aa61 AH |
970 | node = dev_to_node(&ndev->dev); |
971 | ||
972 | nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); | |
fce8a7bb JM |
973 | if (!nt) |
974 | return -ENOMEM; | |
975 | ||
e26a5843 AH |
976 | nt->ndev = ndev; |
977 | ||
978 | mw_count = ntb_mw_count(ndev); | |
979 | ||
980 | nt->mw_count = mw_count; | |
981 | ||
1199aa61 AH |
982 | nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
983 | GFP_KERNEL, node); | |
e26a5843 AH |
984 | if (!nt->mw_vec) { |
985 | rc = -ENOMEM; | |
fce8a7bb JM |
986 | goto err; |
987 | } | |
988 | ||
e26a5843 AH |
989 | for (i = 0; i < mw_count; i++) { |
990 | mw = &nt->mw_vec[i]; | |
991 | ||
992 | rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, | |
993 | &mw->xlat_align, &mw->xlat_align_size); | |
994 | if (rc) | |
995 | goto err1; | |
996 | ||
06917f75 | 997 | mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
e26a5843 AH |
998 | if (!mw->vbase) { |
999 | rc = -ENOMEM; | |
1000 | goto err1; | |
1001 | } | |
1002 | ||
1003 | mw->buff_size = 0; | |
1004 | mw->xlat_size = 0; | |
1005 | mw->virt_addr = NULL; | |
1006 | mw->dma_addr = 0; | |
948d3a65 JM |
1007 | } |
1008 | ||
e26a5843 AH |
1009 | qp_bitmap = ntb_db_valid_mask(ndev); |
1010 | ||
1011 | qp_count = ilog2(qp_bitmap); | |
1012 | if (max_num_clients && max_num_clients < qp_count) | |
1013 | qp_count = max_num_clients; | |
1014 | else if (mw_count < qp_count) | |
1015 | qp_count = mw_count; | |
1016 | ||
1017 | qp_bitmap &= BIT_ULL(qp_count) - 1; | |
1018 | ||
1019 | nt->qp_count = qp_count; | |
1020 | nt->qp_bitmap = qp_bitmap; | |
1021 | nt->qp_bitmap_free = qp_bitmap; | |
fce8a7bb | 1022 | |
1199aa61 AH |
1023 | nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
1024 | GFP_KERNEL, node); | |
e26a5843 | 1025 | if (!nt->qp_vec) { |
fce8a7bb | 1026 | rc = -ENOMEM; |
948d3a65 | 1027 | goto err2; |
fce8a7bb JM |
1028 | } |
1029 | ||
e26a5843 | 1030 | for (i = 0; i < qp_count; i++) { |
282a2fee JM |
1031 | rc = ntb_transport_init_queue(nt, i); |
1032 | if (rc) | |
1033 | goto err3; | |
1034 | } | |
fce8a7bb JM |
1035 | |
1036 | INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); | |
fca4d518 | 1037 | INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
fce8a7bb | 1038 | |
e26a5843 | 1039 | rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
fce8a7bb | 1040 | if (rc) |
948d3a65 | 1041 | goto err3; |
fce8a7bb JM |
1042 | |
1043 | INIT_LIST_HEAD(&nt->client_devs); | |
1044 | rc = ntb_bus_init(nt); | |
1045 | if (rc) | |
948d3a65 | 1046 | goto err4; |
fce8a7bb | 1047 | |
e26a5843 AH |
1048 | nt->link_is_up = false; |
1049 | ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); | |
1050 | ntb_link_event(ndev); | |
fce8a7bb JM |
1051 | |
1052 | return 0; | |
1053 | ||
948d3a65 | 1054 | err4: |
e26a5843 | 1055 | ntb_clear_ctx(ndev); |
948d3a65 | 1056 | err3: |
e26a5843 | 1057 | kfree(nt->qp_vec); |
948d3a65 | 1058 | err2: |
e26a5843 | 1059 | kfree(nt->mw_vec); |
fce8a7bb | 1060 | err1: |
e26a5843 AH |
1061 | while (i--) { |
1062 | mw = &nt->mw_vec[i]; | |
1063 | iounmap(mw->vbase); | |
1064 | } | |
fce8a7bb | 1065 | err: |
fce8a7bb JM |
1066 | kfree(nt); |
1067 | return rc; | |
1068 | } | |
1069 | ||
e26a5843 | 1070 | static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
fce8a7bb | 1071 | { |
e26a5843 AH |
1072 | struct ntb_transport_ctx *nt = ndev->ctx; |
1073 | struct ntb_transport_qp *qp; | |
1074 | u64 qp_bitmap_alloc; | |
fce8a7bb JM |
1075 | int i; |
1076 | ||
fca4d518 | 1077 | ntb_transport_link_cleanup(nt); |
e26a5843 AH |
1078 | cancel_work_sync(&nt->link_cleanup); |
1079 | cancel_delayed_work_sync(&nt->link_work); | |
1080 | ||
1081 | qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; | |
fce8a7bb JM |
1082 | |
1083 | /* verify that all the qp's are freed */ | |
e26a5843 AH |
1084 | for (i = 0; i < nt->qp_count; i++) { |
1085 | qp = &nt->qp_vec[i]; | |
1086 | if (qp_bitmap_alloc & BIT_ULL(i)) | |
1087 | ntb_transport_free_queue(qp); | |
1088 | debugfs_remove_recursive(qp->debugfs_dir); | |
1517a3f2 | 1089 | } |
fce8a7bb | 1090 | |
e26a5843 AH |
1091 | ntb_link_disable(ndev); |
1092 | ntb_clear_ctx(ndev); | |
fce8a7bb | 1093 | |
e26a5843 | 1094 | ntb_bus_remove(nt); |
fce8a7bb | 1095 | |
e26a5843 | 1096 | for (i = nt->mw_count; i--; ) { |
113fc505 | 1097 | ntb_free_mw(nt, i); |
e26a5843 AH |
1098 | iounmap(nt->mw_vec[i].vbase); |
1099 | } | |
fce8a7bb | 1100 | |
e26a5843 AH |
1101 | kfree(nt->qp_vec); |
1102 | kfree(nt->mw_vec); | |
fce8a7bb JM |
1103 | kfree(nt); |
1104 | } | |
1105 | ||
282a2fee | 1106 | static void ntb_rx_copy_callback(void *data) |
fce8a7bb | 1107 | { |
282a2fee JM |
1108 | struct ntb_queue_entry *entry = data; |
1109 | struct ntb_transport_qp *qp = entry->qp; | |
448c6fb3 JM |
1110 | void *cb_data = entry->cb_data; |
1111 | unsigned int len = entry->len; | |
282a2fee JM |
1112 | struct ntb_payload_header *hdr = entry->rx_hdr; |
1113 | ||
282a2fee | 1114 | hdr->flags = 0; |
fce8a7bb | 1115 | |
282a2fee | 1116 | iowrite32(entry->index, &qp->rx_info->entry); |
fce8a7bb JM |
1117 | |
1118 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); | |
448c6fb3 | 1119 | |
e26a5843 | 1120 | if (qp->rx_handler && qp->client_ready) |
448c6fb3 | 1121 | qp->rx_handler(qp, qp->cb_data, cb_data, len); |
fce8a7bb JM |
1122 | } |
1123 | ||
282a2fee JM |
1124 | static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
1125 | { | |
1126 | void *buf = entry->buf; | |
1127 | size_t len = entry->len; | |
1128 | ||
1129 | memcpy(buf, offset, len); | |
1130 | ||
e26a5843 AH |
1131 | /* Ensure that the data is fully copied out before clearing the flag */ |
1132 | wmb(); | |
1133 | ||
282a2fee JM |
1134 | ntb_rx_copy_callback(entry); |
1135 | } | |
1136 | ||
1137 | static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset, | |
1138 | size_t len) | |
1139 | { | |
1140 | struct dma_async_tx_descriptor *txd; | |
1141 | struct ntb_transport_qp *qp = entry->qp; | |
1142 | struct dma_chan *chan = qp->dma_chan; | |
1143 | struct dma_device *device; | |
1144 | size_t pay_off, buff_off; | |
6f57fd05 | 1145 | struct dmaengine_unmap_data *unmap; |
282a2fee JM |
1146 | dma_cookie_t cookie; |
1147 | void *buf = entry->buf; | |
282a2fee JM |
1148 | |
1149 | entry->len = len; | |
1150 | ||
1151 | if (!chan) | |
1152 | goto err; | |
1153 | ||
53ca4fea | 1154 | if (len < copy_bytes) |
6f57fd05 | 1155 | goto err_wait; |
282a2fee JM |
1156 | |
1157 | device = chan->device; | |
e26a5843 AH |
1158 | pay_off = (size_t)offset & ~PAGE_MASK; |
1159 | buff_off = (size_t)buf & ~PAGE_MASK; | |
282a2fee JM |
1160 | |
1161 | if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) | |
6f57fd05 | 1162 | goto err_wait; |
282a2fee | 1163 | |
6f57fd05 BZ |
1164 | unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
1165 | if (!unmap) | |
1166 | goto err_wait; | |
282a2fee | 1167 | |
6f57fd05 BZ |
1168 | unmap->len = len; |
1169 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), | |
1170 | pay_off, len, DMA_TO_DEVICE); | |
1171 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1172 | goto err_get_unmap; | |
1173 | ||
1174 | unmap->to_cnt = 1; | |
282a2fee | 1175 | |
6f57fd05 BZ |
1176 | unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
1177 | buff_off, len, DMA_FROM_DEVICE); | |
1178 | if (dma_mapping_error(device->dev, unmap->addr[1])) | |
1179 | goto err_get_unmap; | |
1180 | ||
1181 | unmap->from_cnt = 1; | |
1182 | ||
6f57fd05 | 1183 | txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
0776ae7b BZ |
1184 | unmap->addr[0], len, |
1185 | DMA_PREP_INTERRUPT); | |
282a2fee | 1186 | if (!txd) |
6f57fd05 | 1187 | goto err_get_unmap; |
282a2fee JM |
1188 | |
1189 | txd->callback = ntb_rx_copy_callback; | |
1190 | txd->callback_param = entry; | |
6f57fd05 | 1191 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1192 | |
1193 | cookie = dmaengine_submit(txd); | |
1194 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1195 | goto err_set_unmap; |
1196 | ||
1197 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1198 | |
1199 | qp->last_cookie = cookie; | |
1200 | ||
1201 | qp->rx_async++; | |
1202 | ||
1203 | return; | |
1204 | ||
6f57fd05 BZ |
1205 | err_set_unmap: |
1206 | dmaengine_unmap_put(unmap); | |
1207 | err_get_unmap: | |
1208 | dmaengine_unmap_put(unmap); | |
1209 | err_wait: | |
282a2fee JM |
1210 | /* If the callbacks come out of order, the writing of the index to the |
1211 | * last completed will be out of order. This may result in the | |
1212 | * receive stalling forever. | |
1213 | */ | |
1214 | dma_sync_wait(chan, qp->last_cookie); | |
1215 | err: | |
1216 | ntb_memcpy_rx(entry, offset); | |
1217 | qp->rx_memcpy++; | |
1218 | } | |
1219 | ||
fce8a7bb JM |
1220 | static int ntb_process_rxc(struct ntb_transport_qp *qp) |
1221 | { | |
1222 | struct ntb_payload_header *hdr; | |
1223 | struct ntb_queue_entry *entry; | |
1224 | void *offset; | |
e26a5843 | 1225 | int rc; |
fce8a7bb | 1226 | |
793c20e9 JM |
1227 | offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; |
1228 | hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header); | |
1229 | ||
e26a5843 AH |
1230 | dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
1231 | qp->qp_num, hdr->ver, hdr->len, hdr->flags); | |
fce8a7bb | 1232 | |
fce8a7bb | 1233 | if (!(hdr->flags & DESC_DONE_FLAG)) { |
e26a5843 | 1234 | dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
fce8a7bb JM |
1235 | qp->rx_ring_empty++; |
1236 | return -EAGAIN; | |
1237 | } | |
1238 | ||
e26a5843 AH |
1239 | if (hdr->flags & LINK_DOWN_FLAG) { |
1240 | dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); | |
1241 | ntb_qp_link_down(qp); | |
1242 | hdr->flags = 0; | |
c0900b33 | 1243 | return -EAGAIN; |
e26a5843 AH |
1244 | } |
1245 | ||
1246 | if (hdr->ver != (u32)qp->rx_pkts) { | |
1247 | dev_dbg(&qp->ndev->pdev->dev, | |
1248 | "version mismatch, expected %llu - got %u\n", | |
1249 | qp->rx_pkts, hdr->ver); | |
fce8a7bb JM |
1250 | qp->rx_err_ver++; |
1251 | return -EIO; | |
1252 | } | |
1253 | ||
e26a5843 AH |
1254 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); |
1255 | if (!entry) { | |
1256 | dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); | |
1257 | qp->rx_err_no_buf++; | |
fce8a7bb | 1258 | |
e26a5843 | 1259 | rc = -ENOMEM; |
282a2fee | 1260 | goto err; |
fce8a7bb JM |
1261 | } |
1262 | ||
282a2fee | 1263 | if (hdr->len > entry->len) { |
e26a5843 AH |
1264 | dev_dbg(&qp->ndev->pdev->dev, |
1265 | "receive buffer overflow! Wanted %d got %d\n", | |
fce8a7bb | 1266 | hdr->len, entry->len); |
e26a5843 | 1267 | qp->rx_err_oflow++; |
282a2fee | 1268 | |
e26a5843 | 1269 | rc = -EIO; |
282a2fee | 1270 | goto err; |
fce8a7bb JM |
1271 | } |
1272 | ||
e26a5843 AH |
1273 | dev_dbg(&qp->ndev->pdev->dev, |
1274 | "RX OK index %u ver %u size %d into buf size %d\n", | |
1275 | qp->rx_index, hdr->ver, hdr->len, entry->len); | |
1276 | ||
1277 | qp->rx_bytes += hdr->len; | |
1278 | qp->rx_pkts++; | |
1279 | ||
282a2fee JM |
1280 | entry->index = qp->rx_index; |
1281 | entry->rx_hdr = hdr; | |
1282 | ||
1283 | ntb_async_rx(entry, offset, hdr->len); | |
fce8a7bb | 1284 | |
282a2fee JM |
1285 | qp->rx_index++; |
1286 | qp->rx_index %= qp->rx_max_entry; | |
1287 | ||
1288 | return 0; | |
1289 | ||
1290 | err: | |
e26a5843 AH |
1291 | /* FIXME: if this syncrhonous update of the rx_index gets ahead of |
1292 | * asyncrhonous ntb_rx_copy_callback of previous entry, there are three | |
1293 | * scenarios: | |
1294 | * | |
1295 | * 1) The peer might miss this update, but observe the update | |
1296 | * from the memcpy completion callback. In this case, the buffer will | |
1297 | * not be freed on the peer to be reused for a different packet. The | |
1298 | * successful rx of a later packet would clear the condition, but the | |
1299 | * condition could persist if several rx fail in a row. | |
1300 | * | |
1301 | * 2) The peer may observe this update before the asyncrhonous copy of | |
1302 | * prior packets is completed. The peer may overwrite the buffers of | |
1303 | * the prior packets before they are copied. | |
1304 | * | |
1305 | * 3) Both: the peer may observe the update, and then observe the index | |
1306 | * decrement by the asynchronous completion callback. Who knows what | |
1307 | * badness that will cause. | |
1308 | */ | |
793c20e9 | 1309 | hdr->flags = 0; |
74465645 | 1310 | iowrite32(qp->rx_index, &qp->rx_info->entry); |
793c20e9 | 1311 | |
e26a5843 | 1312 | return rc; |
fce8a7bb JM |
1313 | } |
1314 | ||
e26a5843 | 1315 | static void ntb_transport_rxc_db(unsigned long data) |
fce8a7bb | 1316 | { |
e26a5843 | 1317 | struct ntb_transport_qp *qp = (void *)data; |
c336acd3 | 1318 | int rc, i; |
fce8a7bb | 1319 | |
e26a5843 AH |
1320 | dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
1321 | __func__, qp->qp_num); | |
e8aeb60c | 1322 | |
c336acd3 JM |
1323 | /* Limit the number of packets processed in a single interrupt to |
1324 | * provide fairness to others | |
1325 | */ | |
1326 | for (i = 0; i < qp->rx_max_entry; i++) { | |
fce8a7bb | 1327 | rc = ntb_process_rxc(qp); |
c336acd3 JM |
1328 | if (rc) |
1329 | break; | |
1330 | } | |
282a2fee JM |
1331 | |
1332 | if (qp->dma_chan) | |
1333 | dma_async_issue_pending(qp->dma_chan); | |
fce8a7bb | 1334 | |
e26a5843 AH |
1335 | if (i == qp->rx_max_entry) { |
1336 | /* there is more work to do */ | |
1337 | tasklet_schedule(&qp->rxc_db_work); | |
1338 | } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { | |
1339 | /* the doorbell bit is set: clear it */ | |
1340 | ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); | |
1341 | /* ntb_db_read ensures ntb_db_clear write is committed */ | |
1342 | ntb_db_read(qp->ndev); | |
1343 | ||
1344 | /* an interrupt may have arrived between finishing | |
1345 | * ntb_process_rxc and clearing the doorbell bit: | |
1346 | * there might be some more work to do. | |
1347 | */ | |
1348 | tasklet_schedule(&qp->rxc_db_work); | |
1349 | } | |
fce8a7bb JM |
1350 | } |
1351 | ||
282a2fee | 1352 | static void ntb_tx_copy_callback(void *data) |
fce8a7bb | 1353 | { |
282a2fee JM |
1354 | struct ntb_queue_entry *entry = data; |
1355 | struct ntb_transport_qp *qp = entry->qp; | |
1356 | struct ntb_payload_header __iomem *hdr = entry->tx_hdr; | |
fce8a7bb | 1357 | |
74465645 | 1358 | iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
fce8a7bb | 1359 | |
e26a5843 | 1360 | ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num)); |
fce8a7bb JM |
1361 | |
1362 | /* The entry length can only be zero if the packet is intended to be a | |
1363 | * "link down" or similar. Since no payload is being sent in these | |
1364 | * cases, there is nothing to add to the completion queue. | |
1365 | */ | |
1366 | if (entry->len > 0) { | |
1367 | qp->tx_bytes += entry->len; | |
1368 | ||
1369 | if (qp->tx_handler) | |
1370 | qp->tx_handler(qp, qp->cb_data, entry->cb_data, | |
1371 | entry->len); | |
1372 | } | |
1373 | ||
1374 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q); | |
1375 | } | |
1376 | ||
282a2fee | 1377 | static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
fce8a7bb | 1378 | { |
06917f75 DJ |
1379 | #ifdef ARCH_HAS_NOCACHE_UACCESS |
1380 | /* | |
1381 | * Using non-temporal mov to improve performance on non-cached | |
1382 | * writes, even though we aren't actually copying from user space. | |
1383 | */ | |
1384 | __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); | |
1385 | #else | |
282a2fee | 1386 | memcpy_toio(offset, entry->buf, entry->len); |
06917f75 | 1387 | #endif |
282a2fee | 1388 | |
e26a5843 AH |
1389 | /* Ensure that the data is fully copied out before setting the flags */ |
1390 | wmb(); | |
1391 | ||
282a2fee JM |
1392 | ntb_tx_copy_callback(entry); |
1393 | } | |
1394 | ||
1395 | static void ntb_async_tx(struct ntb_transport_qp *qp, | |
1396 | struct ntb_queue_entry *entry) | |
1397 | { | |
1398 | struct ntb_payload_header __iomem *hdr; | |
1399 | struct dma_async_tx_descriptor *txd; | |
1400 | struct dma_chan *chan = qp->dma_chan; | |
1401 | struct dma_device *device; | |
1402 | size_t dest_off, buff_off; | |
6f57fd05 BZ |
1403 | struct dmaengine_unmap_data *unmap; |
1404 | dma_addr_t dest; | |
282a2fee | 1405 | dma_cookie_t cookie; |
74465645 | 1406 | void __iomem *offset; |
282a2fee JM |
1407 | size_t len = entry->len; |
1408 | void *buf = entry->buf; | |
fce8a7bb | 1409 | |
793c20e9 | 1410 | offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; |
282a2fee JM |
1411 | hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
1412 | entry->tx_hdr = hdr; | |
fce8a7bb | 1413 | |
282a2fee | 1414 | iowrite32(entry->len, &hdr->len); |
e26a5843 | 1415 | iowrite32((u32)qp->tx_pkts, &hdr->ver); |
282a2fee JM |
1416 | |
1417 | if (!chan) | |
1418 | goto err; | |
1419 | ||
1420 | if (len < copy_bytes) | |
1421 | goto err; | |
1422 | ||
1423 | device = chan->device; | |
1424 | dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index; | |
e26a5843 AH |
1425 | buff_off = (size_t)buf & ~PAGE_MASK; |
1426 | dest_off = (size_t)dest & ~PAGE_MASK; | |
282a2fee JM |
1427 | |
1428 | if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) | |
1429 | goto err; | |
1430 | ||
6f57fd05 BZ |
1431 | unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
1432 | if (!unmap) | |
282a2fee JM |
1433 | goto err; |
1434 | ||
6f57fd05 BZ |
1435 | unmap->len = len; |
1436 | unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), | |
1437 | buff_off, len, DMA_TO_DEVICE); | |
1438 | if (dma_mapping_error(device->dev, unmap->addr[0])) | |
1439 | goto err_get_unmap; | |
1440 | ||
1441 | unmap->to_cnt = 1; | |
1442 | ||
6f57fd05 | 1443 | txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
0776ae7b | 1444 | DMA_PREP_INTERRUPT); |
282a2fee | 1445 | if (!txd) |
6f57fd05 | 1446 | goto err_get_unmap; |
282a2fee JM |
1447 | |
1448 | txd->callback = ntb_tx_copy_callback; | |
1449 | txd->callback_param = entry; | |
6f57fd05 | 1450 | dma_set_unmap(txd, unmap); |
282a2fee JM |
1451 | |
1452 | cookie = dmaengine_submit(txd); | |
1453 | if (dma_submit_error(cookie)) | |
6f57fd05 BZ |
1454 | goto err_set_unmap; |
1455 | ||
1456 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1457 | |
1458 | dma_async_issue_pending(chan); | |
1459 | qp->tx_async++; | |
1460 | ||
1461 | return; | |
6f57fd05 BZ |
1462 | err_set_unmap: |
1463 | dmaengine_unmap_put(unmap); | |
1464 | err_get_unmap: | |
1465 | dmaengine_unmap_put(unmap); | |
282a2fee JM |
1466 | err: |
1467 | ntb_memcpy_tx(entry, offset); | |
1468 | qp->tx_memcpy++; | |
1469 | } | |
1470 | ||
1471 | static int ntb_process_tx(struct ntb_transport_qp *qp, | |
1472 | struct ntb_queue_entry *entry) | |
1473 | { | |
793c20e9 | 1474 | if (qp->tx_index == qp->remote_rx_info->entry) { |
fce8a7bb JM |
1475 | qp->tx_ring_full++; |
1476 | return -EAGAIN; | |
1477 | } | |
1478 | ||
ef114ed5 | 1479 | if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { |
fce8a7bb JM |
1480 | if (qp->tx_handler) |
1481 | qp->tx_handler(qp->cb_data, qp, NULL, -EIO); | |
1482 | ||
1483 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1484 | &qp->tx_free_q); | |
1485 | return 0; | |
1486 | } | |
1487 | ||
282a2fee | 1488 | ntb_async_tx(qp, entry); |
fce8a7bb | 1489 | |
793c20e9 JM |
1490 | qp->tx_index++; |
1491 | qp->tx_index %= qp->tx_max_entry; | |
fce8a7bb JM |
1492 | |
1493 | qp->tx_pkts++; | |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static void ntb_send_link_down(struct ntb_transport_qp *qp) | |
1499 | { | |
e26a5843 | 1500 | struct pci_dev *pdev = qp->ndev->pdev; |
fce8a7bb JM |
1501 | struct ntb_queue_entry *entry; |
1502 | int i, rc; | |
1503 | ||
e26a5843 | 1504 | if (!qp->link_is_up) |
fce8a7bb JM |
1505 | return; |
1506 | ||
e22e0b9d | 1507 | dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num); |
fce8a7bb JM |
1508 | |
1509 | for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { | |
f766755c | 1510 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
fce8a7bb JM |
1511 | if (entry) |
1512 | break; | |
1513 | msleep(100); | |
1514 | } | |
1515 | ||
1516 | if (!entry) | |
1517 | return; | |
1518 | ||
1519 | entry->cb_data = NULL; | |
1520 | entry->buf = NULL; | |
1521 | entry->len = 0; | |
1522 | entry->flags = LINK_DOWN_FLAG; | |
1523 | ||
1524 | rc = ntb_process_tx(qp, entry); | |
1525 | if (rc) | |
1526 | dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n", | |
1527 | qp->qp_num); | |
2849b5d7 AH |
1528 | |
1529 | ntb_qp_link_down_reset(qp); | |
fce8a7bb JM |
1530 | } |
1531 | ||
1199aa61 AH |
1532 | static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
1533 | { | |
1534 | return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; | |
1535 | } | |
1536 | ||
fce8a7bb JM |
1537 | /** |
1538 | * ntb_transport_create_queue - Create a new NTB transport layer queue | |
1539 | * @rx_handler: receive callback function | |
1540 | * @tx_handler: transmit callback function | |
1541 | * @event_handler: event callback function | |
1542 | * | |
1543 | * Create a new NTB transport layer queue and provide the queue with a callback | |
1544 | * routine for both transmit and receive. The receive callback routine will be | |
1545 | * used to pass up data when the transport has received it on the queue. The | |
1546 | * transmit callback routine will be called when the transport has completed the | |
1547 | * transmission of the data on the queue and the data is ready to be freed. | |
1548 | * | |
1549 | * RETURNS: pointer to newly created ntb_queue, NULL on error. | |
1550 | */ | |
1551 | struct ntb_transport_qp * | |
e26a5843 | 1552 | ntb_transport_create_queue(void *data, struct device *client_dev, |
fce8a7bb JM |
1553 | const struct ntb_queue_handlers *handlers) |
1554 | { | |
e26a5843 AH |
1555 | struct ntb_dev *ndev; |
1556 | struct pci_dev *pdev; | |
1557 | struct ntb_transport_ctx *nt; | |
fce8a7bb JM |
1558 | struct ntb_queue_entry *entry; |
1559 | struct ntb_transport_qp *qp; | |
e26a5843 | 1560 | u64 qp_bit; |
fce8a7bb | 1561 | unsigned int free_queue; |
1199aa61 AH |
1562 | dma_cap_mask_t dma_mask; |
1563 | int node; | |
e26a5843 | 1564 | int i; |
fce8a7bb | 1565 | |
e26a5843 AH |
1566 | ndev = dev_ntb(client_dev->parent); |
1567 | pdev = ndev->pdev; | |
1568 | nt = ndev->ctx; | |
fce8a7bb | 1569 | |
1199aa61 AH |
1570 | node = dev_to_node(&ndev->dev); |
1571 | ||
fce8a7bb JM |
1572 | free_queue = ffs(nt->qp_bitmap); |
1573 | if (!free_queue) | |
1574 | goto err; | |
1575 | ||
1576 | /* decrement free_queue to make it zero based */ | |
1577 | free_queue--; | |
1578 | ||
e26a5843 AH |
1579 | qp = &nt->qp_vec[free_queue]; |
1580 | qp_bit = BIT_ULL(qp->qp_num); | |
1581 | ||
1582 | nt->qp_bitmap_free &= ~qp_bit; | |
fce8a7bb | 1583 | |
fce8a7bb JM |
1584 | qp->cb_data = data; |
1585 | qp->rx_handler = handlers->rx_handler; | |
1586 | qp->tx_handler = handlers->tx_handler; | |
1587 | qp->event_handler = handlers->event_handler; | |
1588 | ||
1199aa61 AH |
1589 | dma_cap_zero(dma_mask); |
1590 | dma_cap_set(DMA_MEMCPY, dma_mask); | |
1591 | ||
1592 | qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn, | |
1593 | (void *)(unsigned long)node); | |
1594 | if (!qp->dma_chan) | |
282a2fee | 1595 | dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); |
282a2fee | 1596 | |
fce8a7bb | 1597 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
1199aa61 | 1598 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1599 | if (!entry) |
1600 | goto err1; | |
1601 | ||
282a2fee | 1602 | entry->qp = qp; |
fce8a7bb | 1603 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, |
f766755c | 1604 | &qp->rx_free_q); |
fce8a7bb JM |
1605 | } |
1606 | ||
1607 | for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { | |
1199aa61 | 1608 | entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
fce8a7bb JM |
1609 | if (!entry) |
1610 | goto err2; | |
1611 | ||
282a2fee | 1612 | entry->qp = qp; |
fce8a7bb | 1613 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
f766755c | 1614 | &qp->tx_free_q); |
fce8a7bb JM |
1615 | } |
1616 | ||
e26a5843 AH |
1617 | ntb_db_clear(qp->ndev, qp_bit); |
1618 | ntb_db_clear_mask(qp->ndev, qp_bit); | |
fce8a7bb JM |
1619 | |
1620 | dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); | |
1621 | ||
1622 | return qp; | |
1623 | ||
fce8a7bb | 1624 | err2: |
f766755c | 1625 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1626 | kfree(entry); |
1627 | err1: | |
f766755c | 1628 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb | 1629 | kfree(entry); |
94681194 | 1630 | if (qp->dma_chan) |
1199aa61 | 1631 | dma_release_channel(qp->dma_chan); |
e26a5843 | 1632 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1633 | err: |
1634 | return NULL; | |
1635 | } | |
1636 | EXPORT_SYMBOL_GPL(ntb_transport_create_queue); | |
1637 | ||
1638 | /** | |
1639 | * ntb_transport_free_queue - Frees NTB transport queue | |
1640 | * @qp: NTB queue to be freed | |
1641 | * | |
1642 | * Frees NTB transport queue | |
1643 | */ | |
1644 | void ntb_transport_free_queue(struct ntb_transport_qp *qp) | |
1645 | { | |
e26a5843 | 1646 | struct ntb_transport_ctx *nt = qp->transport; |
186f27ff | 1647 | struct pci_dev *pdev; |
fce8a7bb | 1648 | struct ntb_queue_entry *entry; |
e26a5843 | 1649 | u64 qp_bit; |
fce8a7bb JM |
1650 | |
1651 | if (!qp) | |
1652 | return; | |
1653 | ||
e26a5843 | 1654 | pdev = qp->ndev->pdev; |
186f27ff | 1655 | |
282a2fee JM |
1656 | if (qp->dma_chan) { |
1657 | struct dma_chan *chan = qp->dma_chan; | |
1658 | /* Putting the dma_chan to NULL will force any new traffic to be | |
1659 | * processed by the CPU instead of the DAM engine | |
1660 | */ | |
1661 | qp->dma_chan = NULL; | |
1662 | ||
1663 | /* Try to be nice and wait for any queued DMA engine | |
1664 | * transactions to process before smashing it with a rock | |
1665 | */ | |
1666 | dma_sync_wait(chan, qp->last_cookie); | |
1667 | dmaengine_terminate_all(chan); | |
1199aa61 | 1668 | dma_release_channel(chan); |
282a2fee | 1669 | } |
fce8a7bb | 1670 | |
e26a5843 AH |
1671 | qp_bit = BIT_ULL(qp->qp_num); |
1672 | ||
1673 | ntb_db_set_mask(qp->ndev, qp_bit); | |
1674 | tasklet_disable(&qp->rxc_db_work); | |
fce8a7bb | 1675 | |
282a2fee JM |
1676 | cancel_delayed_work_sync(&qp->link_work); |
1677 | ||
e26a5843 AH |
1678 | qp->cb_data = NULL; |
1679 | qp->rx_handler = NULL; | |
1680 | qp->tx_handler = NULL; | |
1681 | qp->event_handler = NULL; | |
1682 | ||
f766755c | 1683 | while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) |
fce8a7bb JM |
1684 | kfree(entry); |
1685 | ||
f766755c | 1686 | while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) { |
fce8a7bb JM |
1687 | dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n"); |
1688 | kfree(entry); | |
1689 | } | |
1690 | ||
f766755c | 1691 | while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
fce8a7bb JM |
1692 | kfree(entry); |
1693 | ||
e26a5843 | 1694 | nt->qp_bitmap_free |= qp_bit; |
fce8a7bb JM |
1695 | |
1696 | dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num); | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(ntb_transport_free_queue); | |
1699 | ||
1700 | /** | |
1701 | * ntb_transport_rx_remove - Dequeues enqueued rx packet | |
1702 | * @qp: NTB queue to be freed | |
1703 | * @len: pointer to variable to write enqueued buffers length | |
1704 | * | |
1705 | * Dequeues unused buffers from receive queue. Should only be used during | |
1706 | * shutdown of qp. | |
1707 | * | |
1708 | * RETURNS: NULL error value on error, or void* for success. | |
1709 | */ | |
1710 | void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len) | |
1711 | { | |
1712 | struct ntb_queue_entry *entry; | |
1713 | void *buf; | |
1714 | ||
e26a5843 | 1715 | if (!qp || qp->client_ready) |
fce8a7bb JM |
1716 | return NULL; |
1717 | ||
1718 | entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); | |
1719 | if (!entry) | |
1720 | return NULL; | |
1721 | ||
1722 | buf = entry->cb_data; | |
1723 | *len = entry->len; | |
1724 | ||
f766755c | 1725 | ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q); |
fce8a7bb JM |
1726 | |
1727 | return buf; | |
1728 | } | |
1729 | EXPORT_SYMBOL_GPL(ntb_transport_rx_remove); | |
1730 | ||
1731 | /** | |
1732 | * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry | |
1733 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1734 | * @cb: per buffer pointer for callback function to use | |
1735 | * @data: pointer to data buffer that incoming packets will be copied into | |
1736 | * @len: length of the data buffer | |
1737 | * | |
1738 | * Enqueue a new receive buffer onto the transport queue into which a NTB | |
1739 | * payload can be received into. | |
1740 | * | |
1741 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1742 | */ | |
1743 | int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1744 | unsigned int len) | |
1745 | { | |
1746 | struct ntb_queue_entry *entry; | |
1747 | ||
1748 | if (!qp) | |
1749 | return -EINVAL; | |
1750 | ||
1751 | entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q); | |
1752 | if (!entry) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | entry->cb_data = cb; | |
1756 | entry->buf = data; | |
1757 | entry->len = len; | |
1758 | ||
f766755c | 1759 | ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q); |
fce8a7bb JM |
1760 | |
1761 | return 0; | |
1762 | } | |
1763 | EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue); | |
1764 | ||
1765 | /** | |
1766 | * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry | |
1767 | * @qp: NTB transport layer queue the entry is to be enqueued on | |
1768 | * @cb: per buffer pointer for callback function to use | |
1769 | * @data: pointer to data buffer that will be sent | |
1770 | * @len: length of the data buffer | |
1771 | * | |
1772 | * Enqueue a new transmit buffer onto the transport queue from which a NTB | |
f9a2cf89 | 1773 | * payload will be transmitted. This assumes that a lock is being held to |
fce8a7bb JM |
1774 | * serialize access to the qp. |
1775 | * | |
1776 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
1777 | */ | |
1778 | int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, | |
1779 | unsigned int len) | |
1780 | { | |
1781 | struct ntb_queue_entry *entry; | |
1782 | int rc; | |
1783 | ||
e26a5843 | 1784 | if (!qp || !qp->link_is_up || !len) |
fce8a7bb JM |
1785 | return -EINVAL; |
1786 | ||
1787 | entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); | |
282a2fee JM |
1788 | if (!entry) { |
1789 | qp->tx_err_no_buf++; | |
fce8a7bb | 1790 | return -ENOMEM; |
282a2fee | 1791 | } |
fce8a7bb JM |
1792 | |
1793 | entry->cb_data = cb; | |
1794 | entry->buf = data; | |
1795 | entry->len = len; | |
1796 | entry->flags = 0; | |
1797 | ||
1798 | rc = ntb_process_tx(qp, entry); | |
1799 | if (rc) | |
1800 | ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, | |
1801 | &qp->tx_free_q); | |
1802 | ||
1803 | return rc; | |
1804 | } | |
1805 | EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue); | |
1806 | ||
1807 | /** | |
1808 | * ntb_transport_link_up - Notify NTB transport of client readiness to use queue | |
1809 | * @qp: NTB transport layer queue to be enabled | |
1810 | * | |
1811 | * Notify NTB transport layer of client readiness to use queue | |
1812 | */ | |
1813 | void ntb_transport_link_up(struct ntb_transport_qp *qp) | |
1814 | { | |
1815 | if (!qp) | |
1816 | return; | |
1817 | ||
e26a5843 | 1818 | qp->client_ready = true; |
fce8a7bb | 1819 | |
e26a5843 | 1820 | if (qp->transport->link_is_up) |
fce8a7bb JM |
1821 | schedule_delayed_work(&qp->link_work, 0); |
1822 | } | |
1823 | EXPORT_SYMBOL_GPL(ntb_transport_link_up); | |
1824 | ||
1825 | /** | |
1826 | * ntb_transport_link_down - Notify NTB transport to no longer enqueue data | |
1827 | * @qp: NTB transport layer queue to be disabled | |
1828 | * | |
1829 | * Notify NTB transport layer of client's desire to no longer receive data on | |
1830 | * transport queue specified. It is the client's responsibility to ensure all | |
f9a2cf89 | 1831 | * entries on queue are purged or otherwise handled appropriately. |
fce8a7bb JM |
1832 | */ |
1833 | void ntb_transport_link_down(struct ntb_transport_qp *qp) | |
1834 | { | |
186f27ff | 1835 | struct pci_dev *pdev; |
e26a5843 | 1836 | int val; |
fce8a7bb JM |
1837 | |
1838 | if (!qp) | |
1839 | return; | |
1840 | ||
e26a5843 AH |
1841 | pdev = qp->ndev->pdev; |
1842 | qp->client_ready = false; | |
fce8a7bb | 1843 | |
e26a5843 | 1844 | val = ntb_spad_read(qp->ndev, QP_LINKS); |
fce8a7bb | 1845 | |
e26a5843 AH |
1846 | ntb_peer_spad_write(qp->ndev, QP_LINKS, |
1847 | val & ~BIT(qp->qp_num)); | |
fce8a7bb | 1848 | |
e26a5843 | 1849 | if (qp->link_is_up) |
fce8a7bb JM |
1850 | ntb_send_link_down(qp); |
1851 | else | |
1852 | cancel_delayed_work_sync(&qp->link_work); | |
1853 | } | |
1854 | EXPORT_SYMBOL_GPL(ntb_transport_link_down); | |
1855 | ||
1856 | /** | |
1857 | * ntb_transport_link_query - Query transport link state | |
1858 | * @qp: NTB transport layer queue to be queried | |
1859 | * | |
1860 | * Query connectivity to the remote system of the NTB transport queue | |
1861 | * | |
1862 | * RETURNS: true for link up or false for link down | |
1863 | */ | |
1864 | bool ntb_transport_link_query(struct ntb_transport_qp *qp) | |
1865 | { | |
186f27ff JM |
1866 | if (!qp) |
1867 | return false; | |
1868 | ||
e26a5843 | 1869 | return qp->link_is_up; |
fce8a7bb JM |
1870 | } |
1871 | EXPORT_SYMBOL_GPL(ntb_transport_link_query); | |
1872 | ||
1873 | /** | |
1874 | * ntb_transport_qp_num - Query the qp number | |
1875 | * @qp: NTB transport layer queue to be queried | |
1876 | * | |
1877 | * Query qp number of the NTB transport queue | |
1878 | * | |
1879 | * RETURNS: a zero based number specifying the qp number | |
1880 | */ | |
1881 | unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp) | |
1882 | { | |
186f27ff JM |
1883 | if (!qp) |
1884 | return 0; | |
1885 | ||
fce8a7bb JM |
1886 | return qp->qp_num; |
1887 | } | |
1888 | EXPORT_SYMBOL_GPL(ntb_transport_qp_num); | |
1889 | ||
1890 | /** | |
1891 | * ntb_transport_max_size - Query the max payload size of a qp | |
1892 | * @qp: NTB transport layer queue to be queried | |
1893 | * | |
1894 | * Query the maximum payload size permissible on the given qp | |
1895 | * | |
1896 | * RETURNS: the max payload size of a qp | |
1897 | */ | |
ef114ed5 | 1898 | unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) |
fce8a7bb | 1899 | { |
282a2fee JM |
1900 | unsigned int max; |
1901 | ||
186f27ff JM |
1902 | if (!qp) |
1903 | return 0; | |
1904 | ||
282a2fee JM |
1905 | if (!qp->dma_chan) |
1906 | return qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1907 | ||
1908 | /* If DMA engine usage is possible, try to find the max size for that */ | |
1909 | max = qp->tx_max_frame - sizeof(struct ntb_payload_header); | |
1910 | max -= max % (1 << qp->dma_chan->device->copy_align); | |
1911 | ||
1912 | return max; | |
fce8a7bb JM |
1913 | } |
1914 | EXPORT_SYMBOL_GPL(ntb_transport_max_size); | |
e26a5843 AH |
1915 | |
1916 | static void ntb_transport_doorbell_callback(void *data, int vector) | |
1917 | { | |
1918 | struct ntb_transport_ctx *nt = data; | |
1919 | struct ntb_transport_qp *qp; | |
1920 | u64 db_bits; | |
1921 | unsigned int qp_num; | |
1922 | ||
1923 | db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & | |
1924 | ntb_db_vector_mask(nt->ndev, vector)); | |
1925 | ||
1926 | while (db_bits) { | |
1927 | qp_num = __ffs(db_bits); | |
1928 | qp = &nt->qp_vec[qp_num]; | |
1929 | ||
1930 | tasklet_schedule(&qp->rxc_db_work); | |
1931 | ||
1932 | db_bits &= ~BIT_ULL(qp_num); | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | static const struct ntb_ctx_ops ntb_transport_ops = { | |
1937 | .link_event = ntb_transport_event_callback, | |
1938 | .db_event = ntb_transport_doorbell_callback, | |
1939 | }; | |
1940 | ||
1941 | static struct ntb_client ntb_transport_client = { | |
1942 | .ops = { | |
1943 | .probe = ntb_transport_probe, | |
1944 | .remove = ntb_transport_free, | |
1945 | }, | |
1946 | }; | |
1947 | ||
1948 | static int __init ntb_transport_init(void) | |
1949 | { | |
1950 | int rc; | |
1951 | ||
1952 | if (debugfs_initialized()) | |
1953 | nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
1954 | ||
1955 | rc = bus_register(&ntb_transport_bus); | |
1956 | if (rc) | |
1957 | goto err_bus; | |
1958 | ||
1959 | rc = ntb_register_client(&ntb_transport_client); | |
1960 | if (rc) | |
1961 | goto err_client; | |
1962 | ||
1963 | return 0; | |
1964 | ||
1965 | err_client: | |
1966 | bus_unregister(&ntb_transport_bus); | |
1967 | err_bus: | |
1968 | debugfs_remove_recursive(nt_debugfs_dir); | |
1969 | return rc; | |
1970 | } | |
1971 | module_init(ntb_transport_init); | |
1972 | ||
1973 | static void __exit ntb_transport_exit(void) | |
1974 | { | |
1975 | debugfs_remove_recursive(nt_debugfs_dir); | |
1976 | ||
1977 | ntb_unregister_client(&ntb_transport_client); | |
1978 | bus_unregister(&ntb_transport_bus); | |
1979 | } | |
1980 | module_exit(ntb_transport_exit); |