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2d283bdd GS |
1 | /* |
2 | * Copyright Gavin Shan, IBM Corporation 2016. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netlink.h> | |
16 | ||
17 | #include <net/ncsi.h> | |
18 | #include <net/net_namespace.h> | |
19 | #include <net/sock.h> | |
20 | ||
21 | #include "internal.h" | |
22 | ||
23 | LIST_HEAD(ncsi_dev_list); | |
24 | DEFINE_SPINLOCK(ncsi_dev_lock); | |
25 | ||
26 | static inline int ncsi_filter_size(int table) | |
27 | { | |
28 | int sizes[] = { 2, 6, 6, 6 }; | |
29 | ||
30 | BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX); | |
31 | if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX) | |
32 | return -EINVAL; | |
33 | ||
34 | return sizes[table]; | |
35 | } | |
36 | ||
37 | int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data) | |
38 | { | |
39 | struct ncsi_channel_filter *ncf; | |
40 | void *bitmap; | |
41 | int index, size; | |
42 | unsigned long flags; | |
43 | ||
44 | ncf = nc->filters[table]; | |
45 | if (!ncf) | |
46 | return -ENXIO; | |
47 | ||
48 | size = ncsi_filter_size(table); | |
49 | if (size < 0) | |
50 | return size; | |
51 | ||
52 | spin_lock_irqsave(&nc->lock, flags); | |
53 | bitmap = (void *)&ncf->bitmap; | |
54 | index = -1; | |
55 | while ((index = find_next_bit(bitmap, ncf->total, index + 1)) | |
56 | < ncf->total) { | |
57 | if (!memcmp(ncf->data + size * index, data, size)) { | |
58 | spin_unlock_irqrestore(&nc->lock, flags); | |
59 | return index; | |
60 | } | |
61 | } | |
62 | spin_unlock_irqrestore(&nc->lock, flags); | |
63 | ||
64 | return -ENOENT; | |
65 | } | |
66 | ||
67 | int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data) | |
68 | { | |
69 | struct ncsi_channel_filter *ncf; | |
70 | int index, size; | |
71 | void *bitmap; | |
72 | unsigned long flags; | |
73 | ||
74 | size = ncsi_filter_size(table); | |
75 | if (size < 0) | |
76 | return size; | |
77 | ||
78 | index = ncsi_find_filter(nc, table, data); | |
79 | if (index >= 0) | |
80 | return index; | |
81 | ||
82 | ncf = nc->filters[table]; | |
83 | if (!ncf) | |
84 | return -ENODEV; | |
85 | ||
86 | spin_lock_irqsave(&nc->lock, flags); | |
87 | bitmap = (void *)&ncf->bitmap; | |
88 | do { | |
89 | index = find_next_zero_bit(bitmap, ncf->total, 0); | |
90 | if (index >= ncf->total) { | |
91 | spin_unlock_irqrestore(&nc->lock, flags); | |
92 | return -ENOSPC; | |
93 | } | |
94 | } while (test_and_set_bit(index, bitmap)); | |
95 | ||
96 | memcpy(ncf->data + size * index, data, size); | |
97 | spin_unlock_irqrestore(&nc->lock, flags); | |
98 | ||
99 | return index; | |
100 | } | |
101 | ||
102 | int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index) | |
103 | { | |
104 | struct ncsi_channel_filter *ncf; | |
105 | int size; | |
106 | void *bitmap; | |
107 | unsigned long flags; | |
108 | ||
109 | size = ncsi_filter_size(table); | |
110 | if (size < 0) | |
111 | return size; | |
112 | ||
113 | ncf = nc->filters[table]; | |
114 | if (!ncf || index >= ncf->total) | |
115 | return -ENODEV; | |
116 | ||
117 | spin_lock_irqsave(&nc->lock, flags); | |
118 | bitmap = (void *)&ncf->bitmap; | |
119 | if (test_and_clear_bit(index, bitmap)) | |
120 | memset(ncf->data + size * index, 0, size); | |
121 | spin_unlock_irqrestore(&nc->lock, flags); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np, | |
127 | unsigned char id) | |
128 | { | |
129 | struct ncsi_channel *nc; | |
130 | ||
131 | NCSI_FOR_EACH_CHANNEL(np, nc) { | |
132 | if (nc->id == id) | |
133 | return nc; | |
134 | } | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
139 | struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id) | |
140 | { | |
141 | struct ncsi_channel *nc, *tmp; | |
142 | int index; | |
143 | unsigned long flags; | |
144 | ||
145 | nc = kzalloc(sizeof(*nc), GFP_ATOMIC); | |
146 | if (!nc) | |
147 | return NULL; | |
148 | ||
149 | nc->id = id; | |
150 | nc->package = np; | |
151 | nc->state = NCSI_CHANNEL_INACTIVE; | |
152 | spin_lock_init(&nc->lock); | |
153 | for (index = 0; index < NCSI_CAP_MAX; index++) | |
154 | nc->caps[index].index = index; | |
155 | for (index = 0; index < NCSI_MODE_MAX; index++) | |
156 | nc->modes[index].index = index; | |
157 | ||
158 | spin_lock_irqsave(&np->lock, flags); | |
159 | tmp = ncsi_find_channel(np, id); | |
160 | if (tmp) { | |
161 | spin_unlock_irqrestore(&np->lock, flags); | |
162 | kfree(nc); | |
163 | return tmp; | |
164 | } | |
165 | ||
166 | list_add_tail_rcu(&nc->node, &np->channels); | |
167 | np->channel_num++; | |
168 | spin_unlock_irqrestore(&np->lock, flags); | |
169 | ||
170 | return nc; | |
171 | } | |
172 | ||
173 | static void ncsi_remove_channel(struct ncsi_channel *nc) | |
174 | { | |
175 | struct ncsi_package *np = nc->package; | |
176 | struct ncsi_channel_filter *ncf; | |
177 | unsigned long flags; | |
178 | int i; | |
179 | ||
180 | /* Release filters */ | |
181 | spin_lock_irqsave(&nc->lock, flags); | |
182 | for (i = 0; i < NCSI_FILTER_MAX; i++) { | |
183 | ncf = nc->filters[i]; | |
184 | if (!ncf) | |
185 | continue; | |
186 | ||
187 | nc->filters[i] = NULL; | |
188 | kfree(ncf); | |
189 | } | |
190 | ||
191 | nc->state = NCSI_CHANNEL_INACTIVE; | |
192 | spin_unlock_irqrestore(&nc->lock, flags); | |
193 | ||
194 | /* Remove and free channel */ | |
195 | spin_lock_irqsave(&np->lock, flags); | |
196 | list_del_rcu(&nc->node); | |
197 | np->channel_num--; | |
198 | spin_unlock_irqrestore(&np->lock, flags); | |
199 | ||
200 | kfree(nc); | |
201 | } | |
202 | ||
203 | struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp, | |
204 | unsigned char id) | |
205 | { | |
206 | struct ncsi_package *np; | |
207 | ||
208 | NCSI_FOR_EACH_PACKAGE(ndp, np) { | |
209 | if (np->id == id) | |
210 | return np; | |
211 | } | |
212 | ||
213 | return NULL; | |
214 | } | |
215 | ||
216 | struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp, | |
217 | unsigned char id) | |
218 | { | |
219 | struct ncsi_package *np, *tmp; | |
220 | unsigned long flags; | |
221 | ||
222 | np = kzalloc(sizeof(*np), GFP_ATOMIC); | |
223 | if (!np) | |
224 | return NULL; | |
225 | ||
226 | np->id = id; | |
227 | np->ndp = ndp; | |
228 | spin_lock_init(&np->lock); | |
229 | INIT_LIST_HEAD(&np->channels); | |
230 | ||
231 | spin_lock_irqsave(&ndp->lock, flags); | |
232 | tmp = ncsi_find_package(ndp, id); | |
233 | if (tmp) { | |
234 | spin_unlock_irqrestore(&ndp->lock, flags); | |
235 | kfree(np); | |
236 | return tmp; | |
237 | } | |
238 | ||
239 | list_add_tail_rcu(&np->node, &ndp->packages); | |
240 | ndp->package_num++; | |
241 | spin_unlock_irqrestore(&ndp->lock, flags); | |
242 | ||
243 | return np; | |
244 | } | |
245 | ||
246 | void ncsi_remove_package(struct ncsi_package *np) | |
247 | { | |
248 | struct ncsi_dev_priv *ndp = np->ndp; | |
249 | struct ncsi_channel *nc, *tmp; | |
250 | unsigned long flags; | |
251 | ||
252 | /* Release all child channels */ | |
253 | list_for_each_entry_safe(nc, tmp, &np->channels, node) | |
254 | ncsi_remove_channel(nc); | |
255 | ||
256 | /* Remove and free package */ | |
257 | spin_lock_irqsave(&ndp->lock, flags); | |
258 | list_del_rcu(&np->node); | |
259 | ndp->package_num--; | |
260 | spin_unlock_irqrestore(&ndp->lock, flags); | |
261 | ||
262 | kfree(np); | |
263 | } | |
264 | ||
265 | void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp, | |
266 | unsigned char id, | |
267 | struct ncsi_package **np, | |
268 | struct ncsi_channel **nc) | |
269 | { | |
270 | struct ncsi_package *p; | |
271 | struct ncsi_channel *c; | |
272 | ||
273 | p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id)); | |
274 | c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL; | |
275 | ||
276 | if (np) | |
277 | *np = p; | |
278 | if (nc) | |
279 | *nc = c; | |
280 | } | |
281 | ||
282 | /* For two consecutive NCSI commands, the packet IDs shouldn't | |
283 | * be same. Otherwise, the bogus response might be replied. So | |
284 | * the available IDs are allocated in round-robin fashion. | |
285 | */ | |
286 | struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven) | |
287 | { | |
288 | struct ncsi_request *nr = NULL; | |
289 | int i, limit = ARRAY_SIZE(ndp->requests); | |
290 | unsigned long flags; | |
291 | ||
292 | /* Check if there is one available request until the ceiling */ | |
293 | spin_lock_irqsave(&ndp->lock, flags); | |
294 | for (i = ndp->request_id; !nr && i < limit; i++) { | |
295 | if (ndp->requests[i].used) | |
296 | continue; | |
297 | ||
298 | nr = &ndp->requests[i]; | |
299 | nr->used = true; | |
300 | nr->driven = driven; | |
301 | if (++ndp->request_id >= limit) | |
302 | ndp->request_id = 0; | |
303 | } | |
304 | ||
305 | /* Fail back to check from the starting cursor */ | |
306 | for (i = 0; !nr && i < ndp->request_id; i++) { | |
307 | if (ndp->requests[i].used) | |
308 | continue; | |
309 | ||
310 | nr = &ndp->requests[i]; | |
311 | nr->used = true; | |
312 | nr->driven = driven; | |
313 | if (++ndp->request_id >= limit) | |
314 | ndp->request_id = 0; | |
315 | } | |
316 | spin_unlock_irqrestore(&ndp->lock, flags); | |
317 | ||
318 | return nr; | |
319 | } | |
320 | ||
321 | void ncsi_free_request(struct ncsi_request *nr) | |
322 | { | |
323 | struct ncsi_dev_priv *ndp = nr->ndp; | |
324 | struct sk_buff *cmd, *rsp; | |
325 | unsigned long flags; | |
326 | ||
327 | if (nr->enabled) { | |
328 | nr->enabled = false; | |
329 | del_timer_sync(&nr->timer); | |
330 | } | |
331 | ||
332 | spin_lock_irqsave(&ndp->lock, flags); | |
333 | cmd = nr->cmd; | |
334 | rsp = nr->rsp; | |
335 | nr->cmd = NULL; | |
336 | nr->rsp = NULL; | |
337 | nr->used = false; | |
338 | spin_unlock_irqrestore(&ndp->lock, flags); | |
339 | ||
340 | /* Release command and response */ | |
341 | consume_skb(cmd); | |
342 | consume_skb(rsp); | |
343 | } | |
344 | ||
345 | struct ncsi_dev *ncsi_find_dev(struct net_device *dev) | |
346 | { | |
347 | struct ncsi_dev_priv *ndp; | |
348 | ||
349 | NCSI_FOR_EACH_DEV(ndp) { | |
350 | if (ndp->ndev.dev == dev) | |
351 | return &ndp->ndev; | |
352 | } | |
353 | ||
354 | return NULL; | |
355 | } | |
356 | ||
357 | static void ncsi_request_timeout(unsigned long data) | |
358 | { | |
359 | struct ncsi_request *nr = (struct ncsi_request *)data; | |
360 | struct ncsi_dev_priv *ndp = nr->ndp; | |
361 | unsigned long flags; | |
362 | ||
363 | /* If the request already had associated response, | |
364 | * let the response handler to release it. | |
365 | */ | |
366 | spin_lock_irqsave(&ndp->lock, flags); | |
367 | nr->enabled = false; | |
368 | if (nr->rsp || !nr->cmd) { | |
369 | spin_unlock_irqrestore(&ndp->lock, flags); | |
370 | return; | |
371 | } | |
372 | spin_unlock_irqrestore(&ndp->lock, flags); | |
373 | ||
374 | /* Release the request */ | |
375 | ncsi_free_request(nr); | |
376 | } | |
377 | ||
378 | struct ncsi_dev *ncsi_register_dev(struct net_device *dev, | |
379 | void (*handler)(struct ncsi_dev *ndev)) | |
380 | { | |
381 | struct ncsi_dev_priv *ndp; | |
382 | struct ncsi_dev *nd; | |
383 | unsigned long flags; | |
384 | int i; | |
385 | ||
386 | /* Check if the device has been registered or not */ | |
387 | nd = ncsi_find_dev(dev); | |
388 | if (nd) | |
389 | return nd; | |
390 | ||
391 | /* Create NCSI device */ | |
392 | ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC); | |
393 | if (!ndp) | |
394 | return NULL; | |
395 | ||
396 | nd = &ndp->ndev; | |
397 | nd->state = ncsi_dev_state_registered; | |
398 | nd->dev = dev; | |
399 | nd->handler = handler; | |
400 | ||
401 | /* Initialize private NCSI device */ | |
402 | spin_lock_init(&ndp->lock); | |
403 | INIT_LIST_HEAD(&ndp->packages); | |
404 | ndp->request_id = 0; | |
405 | for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) { | |
406 | ndp->requests[i].id = i; | |
407 | ndp->requests[i].ndp = ndp; | |
408 | setup_timer(&ndp->requests[i].timer, | |
409 | ncsi_request_timeout, | |
410 | (unsigned long)&ndp->requests[i]); | |
411 | } | |
412 | ||
413 | spin_lock_irqsave(&ncsi_dev_lock, flags); | |
414 | list_add_tail_rcu(&ndp->node, &ncsi_dev_list); | |
415 | spin_unlock_irqrestore(&ncsi_dev_lock, flags); | |
416 | ||
417 | return nd; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(ncsi_register_dev); | |
420 | ||
421 | void ncsi_unregister_dev(struct ncsi_dev *nd) | |
422 | { | |
423 | struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd); | |
424 | struct ncsi_package *np, *tmp; | |
425 | unsigned long flags; | |
426 | ||
427 | list_for_each_entry_safe(np, tmp, &ndp->packages, node) | |
428 | ncsi_remove_package(np); | |
429 | ||
430 | spin_lock_irqsave(&ncsi_dev_lock, flags); | |
431 | list_del_rcu(&ndp->node); | |
432 | spin_unlock_irqrestore(&ncsi_dev_lock, flags); | |
433 | ||
434 | kfree(ndp); | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(ncsi_unregister_dev); |