drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.c

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