1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2014 Broadcom Corporation
4 */
5
6
7 #include <linux/types.h>
8 #include <linux/netdevice.h>
9 #include <linux/etherdevice.h>
10 #include <brcmu_utils.h>
11
12 #include "core.h"
13 #include "debug.h"
14 #include "bus.h"
15 #include "proto.h"
16 #include "flowring.h"
17 #include "msgbuf.h"
18 #include "common.h"
19
20
21 #define BRCMF_FLOWRING_HIGH 1024
22 #define BRCMF_FLOWRING_LOW (BRCMF_FLOWRING_HIGH - 256)
23 #define BRCMF_FLOWRING_INVALID_IFIDX 0xff
24
25 #define BRCMF_FLOWRING_HASH_AP(da, fifo, ifidx) (da[5] * 2 + fifo + ifidx * 16)
26 #define BRCMF_FLOWRING_HASH_STA(fifo, ifidx) (fifo + ifidx * 16)
27
28 static const u8 brcmf_flowring_prio2fifo[] = {
29 0,
30 1,
31 1,
32 0,
33 2,
34 2,
35 3,
36 3
37 };
38
39 static const u8 ALLFFMAC[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
40
41
42 static bool
brcmf_flowring_is_tdls_mac(struct brcmf_flowring * flow,u8 mac[ETH_ALEN])43 brcmf_flowring_is_tdls_mac(struct brcmf_flowring *flow, u8 mac[ETH_ALEN])
44 {
45 struct brcmf_flowring_tdls_entry *search;
46
47 search = flow->tdls_entry;
48
49 while (search) {
50 if (memcmp(search->mac, mac, ETH_ALEN) == 0)
51 return true;
52 search = search->next;
53 }
54
55 return false;
56 }
57
58
brcmf_flowring_lookup(struct brcmf_flowring * flow,u8 da[ETH_ALEN],u8 prio,u8 ifidx)59 u32 brcmf_flowring_lookup(struct brcmf_flowring *flow, u8 da[ETH_ALEN],
60 u8 prio, u8 ifidx)
61 {
62 struct brcmf_flowring_hash *hash;
63 u16 hash_idx;
64 u32 i;
65 bool found;
66 bool sta;
67 u8 fifo;
68 u8 *mac;
69
70 fifo = brcmf_flowring_prio2fifo[prio];
71 sta = (flow->addr_mode[ifidx] == ADDR_INDIRECT);
72 mac = da;
73 if ((!sta) && (is_multicast_ether_addr(da))) {
74 mac = (u8 *)ALLFFMAC;
75 fifo = 0;
76 }
77 if ((sta) && (flow->tdls_active) &&
78 (brcmf_flowring_is_tdls_mac(flow, da))) {
79 sta = false;
80 }
81 hash_idx = sta ? BRCMF_FLOWRING_HASH_STA(fifo, ifidx) :
82 BRCMF_FLOWRING_HASH_AP(mac, fifo, ifidx);
83 hash_idx &= (BRCMF_FLOWRING_HASHSIZE - 1);
84 found = false;
85 hash = flow->hash;
86 for (i = 0; i < BRCMF_FLOWRING_HASHSIZE; i++) {
87 if ((sta || (memcmp(hash[hash_idx].mac, mac, ETH_ALEN) == 0)) &&
88 (hash[hash_idx].fifo == fifo) &&
89 (hash[hash_idx].ifidx == ifidx)) {
90 found = true;
91 break;
92 }
93 hash_idx++;
94 hash_idx &= (BRCMF_FLOWRING_HASHSIZE - 1);
95 }
96 if (found)
97 return hash[hash_idx].flowid;
98
99 return BRCMF_FLOWRING_INVALID_ID;
100 }
101
102
brcmf_flowring_create(struct brcmf_flowring * flow,u8 da[ETH_ALEN],u8 prio,u8 ifidx)103 u32 brcmf_flowring_create(struct brcmf_flowring *flow, u8 da[ETH_ALEN],
104 u8 prio, u8 ifidx)
105 {
106 struct brcmf_flowring_ring *ring;
107 struct brcmf_flowring_hash *hash;
108 u16 hash_idx;
109 u32 i;
110 bool found;
111 u8 fifo;
112 bool sta;
113 u8 *mac;
114
115 fifo = brcmf_flowring_prio2fifo[prio];
116 sta = (flow->addr_mode[ifidx] == ADDR_INDIRECT);
117 mac = da;
118 if ((!sta) && (is_multicast_ether_addr(da))) {
119 mac = (u8 *)ALLFFMAC;
120 fifo = 0;
121 }
122 if ((sta) && (flow->tdls_active) &&
123 (brcmf_flowring_is_tdls_mac(flow, da))) {
124 sta = false;
125 }
126 hash_idx = sta ? BRCMF_FLOWRING_HASH_STA(fifo, ifidx) :
127 BRCMF_FLOWRING_HASH_AP(mac, fifo, ifidx);
128 hash_idx &= (BRCMF_FLOWRING_HASHSIZE - 1);
129 found = false;
130 hash = flow->hash;
131 for (i = 0; i < BRCMF_FLOWRING_HASHSIZE; i++) {
132 if ((hash[hash_idx].ifidx == BRCMF_FLOWRING_INVALID_IFIDX) &&
133 (is_zero_ether_addr(hash[hash_idx].mac))) {
134 found = true;
135 break;
136 }
137 hash_idx++;
138 hash_idx &= (BRCMF_FLOWRING_HASHSIZE - 1);
139 }
140 if (found) {
141 for (i = 0; i < flow->nrofrings; i++) {
142 if (flow->rings[i] == NULL)
143 break;
144 }
145 if (i == flow->nrofrings)
146 return -ENOMEM;
147
148 ring = kzalloc(sizeof(*ring), GFP_ATOMIC);
149 if (!ring)
150 return -ENOMEM;
151
152 memcpy(hash[hash_idx].mac, mac, ETH_ALEN);
153 hash[hash_idx].fifo = fifo;
154 hash[hash_idx].ifidx = ifidx;
155 hash[hash_idx].flowid = i;
156
157 ring->hash_id = hash_idx;
158 ring->status = RING_CLOSED;
159 skb_queue_head_init(&ring->skblist);
160 flow->rings[i] = ring;
161
162 return i;
163 }
164 return BRCMF_FLOWRING_INVALID_ID;
165 }
166
167
brcmf_flowring_tid(struct brcmf_flowring * flow,u16 flowid)168 u8 brcmf_flowring_tid(struct brcmf_flowring *flow, u16 flowid)
169 {
170 struct brcmf_flowring_ring *ring;
171
172 ring = flow->rings[flowid];
173
174 return flow->hash[ring->hash_id].fifo;
175 }
176
177
brcmf_flowring_block(struct brcmf_flowring * flow,u16 flowid,bool blocked)178 static void brcmf_flowring_block(struct brcmf_flowring *flow, u16 flowid,
179 bool blocked)
180 {
181 struct brcmf_flowring_ring *ring;
182 struct brcmf_bus *bus_if;
183 struct brcmf_pub *drvr;
184 struct brcmf_if *ifp;
185 bool currently_blocked;
186 int i;
187 u8 ifidx;
188 unsigned long flags;
189
190 spin_lock_irqsave(&flow->block_lock, flags);
191
192 ring = flow->rings[flowid];
193 if (ring->blocked == blocked) {
194 spin_unlock_irqrestore(&flow->block_lock, flags);
195 return;
196 }
197 ifidx = brcmf_flowring_ifidx_get(flow, flowid);
198
199 currently_blocked = false;
200 for (i = 0; i < flow->nrofrings; i++) {
201 if ((flow->rings[i]) && (i != flowid)) {
202 ring = flow->rings[i];
203 if ((ring->status == RING_OPEN) &&
204 (brcmf_flowring_ifidx_get(flow, i) == ifidx)) {
205 if (ring->blocked) {
206 currently_blocked = true;
207 break;
208 }
209 }
210 }
211 }
212 flow->rings[flowid]->blocked = blocked;
213 if (currently_blocked) {
214 spin_unlock_irqrestore(&flow->block_lock, flags);
215 return;
216 }
217
218 bus_if = dev_get_drvdata(flow->dev);
219 drvr = bus_if->drvr;
220 ifp = brcmf_get_ifp(drvr, ifidx);
221 brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FLOW, blocked);
222
223 spin_unlock_irqrestore(&flow->block_lock, flags);
224 }
225
226
brcmf_flowring_delete(struct brcmf_flowring * flow,u16 flowid)227 void brcmf_flowring_delete(struct brcmf_flowring *flow, u16 flowid)
228 {
229 struct brcmf_bus *bus_if = dev_get_drvdata(flow->dev);
230 struct brcmf_flowring_ring *ring;
231 struct brcmf_if *ifp;
232 u16 hash_idx;
233 u8 ifidx;
234 struct sk_buff *skb;
235
236 ring = flow->rings[flowid];
237 if (!ring)
238 return;
239
240 ifidx = brcmf_flowring_ifidx_get(flow, flowid);
241 ifp = brcmf_get_ifp(bus_if->drvr, ifidx);
242
243 brcmf_flowring_block(flow, flowid, false);
244 hash_idx = ring->hash_id;
245 flow->hash[hash_idx].ifidx = BRCMF_FLOWRING_INVALID_IFIDX;
246 eth_zero_addr(flow->hash[hash_idx].mac);
247 flow->rings[flowid] = NULL;
248
249 skb = skb_dequeue(&ring->skblist);
250 while (skb) {
251 brcmf_txfinalize(ifp, skb, false);
252 skb = skb_dequeue(&ring->skblist);
253 }
254
255 kfree(ring);
256 }
257
258
brcmf_flowring_enqueue(struct brcmf_flowring * flow,u16 flowid,struct sk_buff * skb)259 u32 brcmf_flowring_enqueue(struct brcmf_flowring *flow, u16 flowid,
260 struct sk_buff *skb)
261 {
262 struct brcmf_flowring_ring *ring;
263
264 ring = flow->rings[flowid];
265
266 skb_queue_tail(&ring->skblist, skb);
267
268 if (!ring->blocked &&
269 (skb_queue_len(&ring->skblist) > BRCMF_FLOWRING_HIGH)) {
270 brcmf_flowring_block(flow, flowid, true);
271 brcmf_dbg(MSGBUF, "Flowcontrol: BLOCK for ring %d\n", flowid);
272 /* To prevent (work around) possible race condition, check
273 * queue len again. It is also possible to use locking to
274 * protect, but that is undesirable for every enqueue and
275 * dequeue. This simple check will solve a possible race
276 * condition if it occurs.
277 */
278 if (skb_queue_len(&ring->skblist) < BRCMF_FLOWRING_LOW)
279 brcmf_flowring_block(flow, flowid, false);
280 }
281 return skb_queue_len(&ring->skblist);
282 }
283
284
brcmf_flowring_dequeue(struct brcmf_flowring * flow,u16 flowid)285 struct sk_buff *brcmf_flowring_dequeue(struct brcmf_flowring *flow, u16 flowid)
286 {
287 struct brcmf_flowring_ring *ring;
288 struct sk_buff *skb;
289
290 ring = flow->rings[flowid];
291 if (ring->status != RING_OPEN)
292 return NULL;
293
294 skb = skb_dequeue(&ring->skblist);
295
296 if (ring->blocked &&
297 (skb_queue_len(&ring->skblist) < BRCMF_FLOWRING_LOW)) {
298 brcmf_flowring_block(flow, flowid, false);
299 brcmf_dbg(MSGBUF, "Flowcontrol: OPEN for ring %d\n", flowid);
300 }
301
302 return skb;
303 }
304
305
brcmf_flowring_reinsert(struct brcmf_flowring * flow,u16 flowid,struct sk_buff * skb)306 void brcmf_flowring_reinsert(struct brcmf_flowring *flow, u16 flowid,
307 struct sk_buff *skb)
308 {
309 struct brcmf_flowring_ring *ring;
310
311 ring = flow->rings[flowid];
312
313 skb_queue_head(&ring->skblist, skb);
314 }
315
316
brcmf_flowring_qlen(struct brcmf_flowring * flow,u16 flowid)317 u32 brcmf_flowring_qlen(struct brcmf_flowring *flow, u16 flowid)
318 {
319 struct brcmf_flowring_ring *ring;
320
321 ring = flow->rings[flowid];
322 if (!ring)
323 return 0;
324
325 if (ring->status != RING_OPEN)
326 return 0;
327
328 return skb_queue_len(&ring->skblist);
329 }
330
331
brcmf_flowring_open(struct brcmf_flowring * flow,u16 flowid)332 void brcmf_flowring_open(struct brcmf_flowring *flow, u16 flowid)
333 {
334 struct brcmf_flowring_ring *ring;
335
336 ring = flow->rings[flowid];
337 if (!ring) {
338 brcmf_err("Ring NULL, for flowid %d\n", flowid);
339 return;
340 }
341
342 ring->status = RING_OPEN;
343 }
344
345
brcmf_flowring_ifidx_get(struct brcmf_flowring * flow,u16 flowid)346 u8 brcmf_flowring_ifidx_get(struct brcmf_flowring *flow, u16 flowid)
347 {
348 struct brcmf_flowring_ring *ring;
349 u16 hash_idx;
350
351 ring = flow->rings[flowid];
352 hash_idx = ring->hash_id;
353
354 return flow->hash[hash_idx].ifidx;
355 }
356
357
brcmf_flowring_attach(struct device * dev,u16 nrofrings)358 struct brcmf_flowring *brcmf_flowring_attach(struct device *dev, u16 nrofrings)
359 {
360 struct brcmf_flowring *flow;
361 u32 i;
362
363 flow = kzalloc(sizeof(*flow), GFP_KERNEL);
364 if (flow) {
365 flow->dev = dev;
366 flow->nrofrings = nrofrings;
367 spin_lock_init(&flow->block_lock);
368 for (i = 0; i < ARRAY_SIZE(flow->addr_mode); i++)
369 flow->addr_mode[i] = ADDR_INDIRECT;
370 for (i = 0; i < ARRAY_SIZE(flow->hash); i++)
371 flow->hash[i].ifidx = BRCMF_FLOWRING_INVALID_IFIDX;
372 flow->rings = kcalloc(nrofrings, sizeof(*flow->rings),
373 GFP_KERNEL);
374 if (!flow->rings) {
375 kfree(flow);
376 flow = NULL;
377 }
378 }
379
380 return flow;
381 }
382
383
brcmf_flowring_detach(struct brcmf_flowring * flow)384 void brcmf_flowring_detach(struct brcmf_flowring *flow)
385 {
386 struct brcmf_bus *bus_if = dev_get_drvdata(flow->dev);
387 struct brcmf_pub *drvr = bus_if->drvr;
388 struct brcmf_flowring_tdls_entry *search;
389 struct brcmf_flowring_tdls_entry *remove;
390 u16 flowid;
391
392 for (flowid = 0; flowid < flow->nrofrings; flowid++) {
393 if (flow->rings[flowid])
394 brcmf_msgbuf_delete_flowring(drvr, flowid);
395 }
396
397 search = flow->tdls_entry;
398 while (search) {
399 remove = search;
400 search = search->next;
401 kfree(remove);
402 }
403 kfree(flow->rings);
404 kfree(flow);
405 }
406
407
brcmf_flowring_configure_addr_mode(struct brcmf_flowring * flow,int ifidx,enum proto_addr_mode addr_mode)408 void brcmf_flowring_configure_addr_mode(struct brcmf_flowring *flow, int ifidx,
409 enum proto_addr_mode addr_mode)
410 {
411 struct brcmf_bus *bus_if = dev_get_drvdata(flow->dev);
412 struct brcmf_pub *drvr = bus_if->drvr;
413 u32 i;
414 u16 flowid;
415
416 if (flow->addr_mode[ifidx] != addr_mode) {
417 for (i = 0; i < ARRAY_SIZE(flow->hash); i++) {
418 if (flow->hash[i].ifidx == ifidx) {
419 flowid = flow->hash[i].flowid;
420 if (flow->rings[flowid]->status != RING_OPEN)
421 continue;
422 flow->rings[flowid]->status = RING_CLOSING;
423 brcmf_msgbuf_delete_flowring(drvr, flowid);
424 }
425 }
426 flow->addr_mode[ifidx] = addr_mode;
427 }
428 }
429
430
brcmf_flowring_delete_peer(struct brcmf_flowring * flow,int ifidx,u8 peer[ETH_ALEN])431 void brcmf_flowring_delete_peer(struct brcmf_flowring *flow, int ifidx,
432 u8 peer[ETH_ALEN])
433 {
434 struct brcmf_bus *bus_if = dev_get_drvdata(flow->dev);
435 struct brcmf_pub *drvr = bus_if->drvr;
436 struct brcmf_flowring_hash *hash;
437 struct brcmf_flowring_tdls_entry *prev;
438 struct brcmf_flowring_tdls_entry *search;
439 u32 i;
440 u16 flowid;
441 bool sta;
442
443 sta = (flow->addr_mode[ifidx] == ADDR_INDIRECT);
444
445 search = flow->tdls_entry;
446 prev = NULL;
447 while (search) {
448 if (memcmp(search->mac, peer, ETH_ALEN) == 0) {
449 sta = false;
450 break;
451 }
452 prev = search;
453 search = search->next;
454 }
455
456 hash = flow->hash;
457 for (i = 0; i < BRCMF_FLOWRING_HASHSIZE; i++) {
458 if ((sta || (memcmp(hash[i].mac, peer, ETH_ALEN) == 0)) &&
459 (hash[i].ifidx == ifidx)) {
460 flowid = flow->hash[i].flowid;
461 if (flow->rings[flowid]->status == RING_OPEN) {
462 flow->rings[flowid]->status = RING_CLOSING;
463 brcmf_msgbuf_delete_flowring(drvr, flowid);
464 }
465 }
466 }
467
468 if (search) {
469 if (prev)
470 prev->next = search->next;
471 else
472 flow->tdls_entry = search->next;
473 kfree(search);
474 if (flow->tdls_entry == NULL)
475 flow->tdls_active = false;
476 }
477 }
478
479
brcmf_flowring_add_tdls_peer(struct brcmf_flowring * flow,int ifidx,u8 peer[ETH_ALEN])480 void brcmf_flowring_add_tdls_peer(struct brcmf_flowring *flow, int ifidx,
481 u8 peer[ETH_ALEN])
482 {
483 struct brcmf_flowring_tdls_entry *tdls_entry;
484 struct brcmf_flowring_tdls_entry *search;
485
486 tdls_entry = kzalloc(sizeof(*tdls_entry), GFP_ATOMIC);
487 if (tdls_entry == NULL)
488 return;
489
490 memcpy(tdls_entry->mac, peer, ETH_ALEN);
491 tdls_entry->next = NULL;
492 if (flow->tdls_entry == NULL) {
493 flow->tdls_entry = tdls_entry;
494 } else {
495 search = flow->tdls_entry;
496 if (memcmp(search->mac, peer, ETH_ALEN) == 0)
497 goto free_entry;
498 while (search->next) {
499 search = search->next;
500 if (memcmp(search->mac, peer, ETH_ALEN) == 0)
501 goto free_entry;
502 }
503 search->next = tdls_entry;
504 }
505
506 flow->tdls_active = true;
507 return;
508
509 free_entry:
510 kfree(tdls_entry);
511 }
512
