| 1 | /* |
| 2 | * Copyright (c) 2007-2011 Atheros Communications Inc. |
| 3 | * |
| 4 | * Permission to use, copy, modify, and/or distribute this software for any |
| 5 | * purpose with or without fee is hereby granted, provided that the above |
| 6 | * copyright notice and this permission notice appear in all copies. |
| 7 | * |
| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 15 | */ |
| 16 | |
| 17 | #include "core.h" |
| 18 | #include "debug.h" |
| 19 | #include "hif-ops.h" |
| 20 | |
| 21 | #define HTC_PACKET_CONTAINER_ALLOCATION 32 |
| 22 | #define HTC_CONTROL_BUFFER_SIZE (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH) |
| 23 | |
| 24 | static int ath6kl_htc_pipe_tx(struct htc_target *handle, |
| 25 | struct htc_packet *packet); |
| 26 | static void ath6kl_htc_pipe_cleanup(struct htc_target *handle); |
| 27 | |
| 28 | /* htc pipe tx path */ |
| 29 | static inline void restore_tx_packet(struct htc_packet *packet) |
| 30 | { |
| 31 | if (packet->info.tx.flags & HTC_FLAGS_TX_FIXUP_NETBUF) { |
| 32 | skb_pull(packet->skb, sizeof(struct htc_frame_hdr)); |
| 33 | packet->info.tx.flags &= ~HTC_FLAGS_TX_FIXUP_NETBUF; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | static void do_send_completion(struct htc_endpoint *ep, |
| 38 | struct list_head *queue_to_indicate) |
| 39 | { |
| 40 | struct htc_packet *packet; |
| 41 | |
| 42 | if (list_empty(queue_to_indicate)) { |
| 43 | /* nothing to indicate */ |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | if (ep->ep_cb.tx_comp_multi != NULL) { |
| 48 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 49 | "%s: calling ep %d, send complete multiple callback (%d pkts)\n", |
| 50 | __func__, ep->eid, |
| 51 | get_queue_depth(queue_to_indicate)); |
| 52 | /* |
| 53 | * a multiple send complete handler is being used, |
| 54 | * pass the queue to the handler |
| 55 | */ |
| 56 | ep->ep_cb.tx_comp_multi(ep->target, queue_to_indicate); |
| 57 | /* |
| 58 | * all packets are now owned by the callback, |
| 59 | * reset queue to be safe |
| 60 | */ |
| 61 | INIT_LIST_HEAD(queue_to_indicate); |
| 62 | } else { |
| 63 | /* using legacy EpTxComplete */ |
| 64 | do { |
| 65 | packet = list_first_entry(queue_to_indicate, |
| 66 | struct htc_packet, list); |
| 67 | |
| 68 | list_del(&packet->list); |
| 69 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 70 | "%s: calling ep %d send complete callback on packet 0x%p\n", |
| 71 | __func__, ep->eid, packet); |
| 72 | ep->ep_cb.tx_complete(ep->target, packet); |
| 73 | } while (!list_empty(queue_to_indicate)); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static void send_packet_completion(struct htc_target *target, |
| 78 | struct htc_packet *packet) |
| 79 | { |
| 80 | struct htc_endpoint *ep = &target->endpoint[packet->endpoint]; |
| 81 | struct list_head container; |
| 82 | |
| 83 | restore_tx_packet(packet); |
| 84 | INIT_LIST_HEAD(&container); |
| 85 | list_add_tail(&packet->list, &container); |
| 86 | |
| 87 | /* do completion */ |
| 88 | do_send_completion(ep, &container); |
| 89 | } |
| 90 | |
| 91 | static void get_htc_packet_credit_based(struct htc_target *target, |
| 92 | struct htc_endpoint *ep, |
| 93 | struct list_head *queue) |
| 94 | { |
| 95 | int credits_required; |
| 96 | int remainder; |
| 97 | u8 send_flags; |
| 98 | struct htc_packet *packet; |
| 99 | unsigned int transfer_len; |
| 100 | |
| 101 | /* NOTE : the TX lock is held when this function is called */ |
| 102 | |
| 103 | /* loop until we can grab as many packets out of the queue as we can */ |
| 104 | while (true) { |
| 105 | send_flags = 0; |
| 106 | if (list_empty(&ep->txq)) |
| 107 | break; |
| 108 | |
| 109 | /* get packet at head, but don't remove it */ |
| 110 | packet = list_first_entry(&ep->txq, struct htc_packet, list); |
| 111 | |
| 112 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 113 | "%s: got head packet:0x%p , queue depth: %d\n", |
| 114 | __func__, packet, get_queue_depth(&ep->txq)); |
| 115 | |
| 116 | transfer_len = packet->act_len + HTC_HDR_LENGTH; |
| 117 | |
| 118 | if (transfer_len <= target->tgt_cred_sz) { |
| 119 | credits_required = 1; |
| 120 | } else { |
| 121 | /* figure out how many credits this message requires */ |
| 122 | credits_required = transfer_len / target->tgt_cred_sz; |
| 123 | remainder = transfer_len % target->tgt_cred_sz; |
| 124 | |
| 125 | if (remainder) |
| 126 | credits_required++; |
| 127 | } |
| 128 | |
| 129 | ath6kl_dbg(ATH6KL_DBG_HTC, "%s: creds required:%d got:%d\n", |
| 130 | __func__, credits_required, ep->cred_dist.credits); |
| 131 | |
| 132 | if (ep->eid == ENDPOINT_0) { |
| 133 | /* |
| 134 | * endpoint 0 is special, it always has a credit and |
| 135 | * does not require credit based flow control |
| 136 | */ |
| 137 | credits_required = 0; |
| 138 | |
| 139 | } else { |
| 140 | if (ep->cred_dist.credits < credits_required) |
| 141 | break; |
| 142 | |
| 143 | ep->cred_dist.credits -= credits_required; |
| 144 | ep->ep_st.cred_cosumd += credits_required; |
| 145 | |
| 146 | /* check if we need credits back from the target */ |
| 147 | if (ep->cred_dist.credits < |
| 148 | ep->cred_dist.cred_per_msg) { |
| 149 | /* tell the target we need credits ASAP! */ |
| 150 | send_flags |= HTC_FLAGS_NEED_CREDIT_UPDATE; |
| 151 | ep->ep_st.cred_low_indicate += 1; |
| 152 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 153 | "%s: host needs credits\n", |
| 154 | __func__); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | /* now we can fully dequeue */ |
| 159 | packet = list_first_entry(&ep->txq, struct htc_packet, list); |
| 160 | |
| 161 | list_del(&packet->list); |
| 162 | /* save the number of credits this packet consumed */ |
| 163 | packet->info.tx.cred_used = credits_required; |
| 164 | /* save send flags */ |
| 165 | packet->info.tx.flags = send_flags; |
| 166 | packet->info.tx.seqno = ep->seqno; |
| 167 | ep->seqno++; |
| 168 | /* queue this packet into the caller's queue */ |
| 169 | list_add_tail(&packet->list, queue); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | static void get_htc_packet(struct htc_target *target, |
| 174 | struct htc_endpoint *ep, |
| 175 | struct list_head *queue, int resources) |
| 176 | { |
| 177 | struct htc_packet *packet; |
| 178 | |
| 179 | /* NOTE : the TX lock is held when this function is called */ |
| 180 | |
| 181 | /* loop until we can grab as many packets out of the queue as we can */ |
| 182 | while (resources) { |
| 183 | if (list_empty(&ep->txq)) |
| 184 | break; |
| 185 | |
| 186 | packet = list_first_entry(&ep->txq, struct htc_packet, list); |
| 187 | list_del(&packet->list); |
| 188 | |
| 189 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 190 | "%s: got packet:0x%p , new queue depth: %d\n", |
| 191 | __func__, packet, get_queue_depth(&ep->txq)); |
| 192 | packet->info.tx.seqno = ep->seqno; |
| 193 | packet->info.tx.flags = 0; |
| 194 | packet->info.tx.cred_used = 0; |
| 195 | ep->seqno++; |
| 196 | |
| 197 | /* queue this packet into the caller's queue */ |
| 198 | list_add_tail(&packet->list, queue); |
| 199 | resources--; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | static int htc_issue_packets(struct htc_target *target, |
| 204 | struct htc_endpoint *ep, |
| 205 | struct list_head *pkt_queue) |
| 206 | { |
| 207 | int status = 0; |
| 208 | u16 payload_len; |
| 209 | struct sk_buff *skb; |
| 210 | struct htc_frame_hdr *htc_hdr; |
| 211 | struct htc_packet *packet; |
| 212 | |
| 213 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 214 | "%s: queue: 0x%p, pkts %d\n", __func__, |
| 215 | pkt_queue, get_queue_depth(pkt_queue)); |
| 216 | |
| 217 | while (!list_empty(pkt_queue)) { |
| 218 | packet = list_first_entry(pkt_queue, struct htc_packet, list); |
| 219 | list_del(&packet->list); |
| 220 | |
| 221 | skb = packet->skb; |
| 222 | if (!skb) { |
| 223 | WARN_ON_ONCE(1); |
| 224 | status = -EINVAL; |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | payload_len = packet->act_len; |
| 229 | |
| 230 | /* setup HTC frame header */ |
| 231 | htc_hdr = skb_push(skb, sizeof(*htc_hdr)); |
| 232 | if (!htc_hdr) { |
| 233 | WARN_ON_ONCE(1); |
| 234 | status = -EINVAL; |
| 235 | break; |
| 236 | } |
| 237 | |
| 238 | packet->info.tx.flags |= HTC_FLAGS_TX_FIXUP_NETBUF; |
| 239 | |
| 240 | /* Endianess? */ |
| 241 | put_unaligned((u16) payload_len, &htc_hdr->payld_len); |
| 242 | htc_hdr->flags = packet->info.tx.flags; |
| 243 | htc_hdr->eid = (u8) packet->endpoint; |
| 244 | htc_hdr->ctrl[0] = 0; |
| 245 | htc_hdr->ctrl[1] = (u8) packet->info.tx.seqno; |
| 246 | |
| 247 | spin_lock_bh(&target->tx_lock); |
| 248 | |
| 249 | /* store in look up queue to match completions */ |
| 250 | list_add_tail(&packet->list, &ep->pipe.tx_lookup_queue); |
| 251 | ep->ep_st.tx_issued += 1; |
| 252 | spin_unlock_bh(&target->tx_lock); |
| 253 | |
| 254 | status = ath6kl_hif_pipe_send(target->dev->ar, |
| 255 | ep->pipe.pipeid_ul, NULL, skb); |
| 256 | |
| 257 | if (status != 0) { |
| 258 | if (status != -ENOMEM) { |
| 259 | /* TODO: if more than 1 endpoint maps to the |
| 260 | * same PipeID, it is possible to run out of |
| 261 | * resources in the HIF layer. |
| 262 | * Don't emit the error |
| 263 | */ |
| 264 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 265 | "%s: failed status:%d\n", |
| 266 | __func__, status); |
| 267 | } |
| 268 | spin_lock_bh(&target->tx_lock); |
| 269 | list_del(&packet->list); |
| 270 | |
| 271 | /* reclaim credits */ |
| 272 | ep->cred_dist.credits += packet->info.tx.cred_used; |
| 273 | spin_unlock_bh(&target->tx_lock); |
| 274 | |
| 275 | /* put it back into the callers queue */ |
| 276 | list_add(&packet->list, pkt_queue); |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | if (status != 0) { |
| 282 | while (!list_empty(pkt_queue)) { |
| 283 | if (status != -ENOMEM) { |
| 284 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 285 | "%s: failed pkt:0x%p status:%d\n", |
| 286 | __func__, packet, status); |
| 287 | } |
| 288 | |
| 289 | packet = list_first_entry(pkt_queue, |
| 290 | struct htc_packet, list); |
| 291 | list_del(&packet->list); |
| 292 | packet->status = status; |
| 293 | send_packet_completion(target, packet); |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | return status; |
| 298 | } |
| 299 | |
| 300 | static enum htc_send_queue_result htc_try_send(struct htc_target *target, |
| 301 | struct htc_endpoint *ep, |
| 302 | struct list_head *txq) |
| 303 | { |
| 304 | struct list_head send_queue; /* temp queue to hold packets */ |
| 305 | struct htc_packet *packet, *tmp_pkt; |
| 306 | struct ath6kl *ar = target->dev->ar; |
| 307 | enum htc_send_full_action action; |
| 308 | int tx_resources, overflow, txqueue_depth, i, good_pkts; |
| 309 | u8 pipeid; |
| 310 | |
| 311 | ath6kl_dbg(ATH6KL_DBG_HTC, "%s: (queue:0x%p depth:%d)\n", |
| 312 | __func__, txq, |
| 313 | (txq == NULL) ? 0 : get_queue_depth(txq)); |
| 314 | |
| 315 | /* init the local send queue */ |
| 316 | INIT_LIST_HEAD(&send_queue); |
| 317 | |
| 318 | /* |
| 319 | * txq equals to NULL means |
| 320 | * caller didn't provide a queue, just wants us to |
| 321 | * check queues and send |
| 322 | */ |
| 323 | if (txq != NULL) { |
| 324 | if (list_empty(txq)) { |
| 325 | /* empty queue */ |
| 326 | return HTC_SEND_QUEUE_DROP; |
| 327 | } |
| 328 | |
| 329 | spin_lock_bh(&target->tx_lock); |
| 330 | txqueue_depth = get_queue_depth(&ep->txq); |
| 331 | spin_unlock_bh(&target->tx_lock); |
| 332 | |
| 333 | if (txqueue_depth >= ep->max_txq_depth) { |
| 334 | /* we've already overflowed */ |
| 335 | overflow = get_queue_depth(txq); |
| 336 | } else { |
| 337 | /* get how much we will overflow by */ |
| 338 | overflow = txqueue_depth; |
| 339 | overflow += get_queue_depth(txq); |
| 340 | /* get how much we will overflow the TX queue by */ |
| 341 | overflow -= ep->max_txq_depth; |
| 342 | } |
| 343 | |
| 344 | /* if overflow is negative or zero, we are okay */ |
| 345 | if (overflow > 0) { |
| 346 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 347 | "%s: Endpoint %d, TX queue will overflow :%d, Tx Depth:%d, Max:%d\n", |
| 348 | __func__, ep->eid, overflow, txqueue_depth, |
| 349 | ep->max_txq_depth); |
| 350 | } |
| 351 | if ((overflow <= 0) || |
| 352 | (ep->ep_cb.tx_full == NULL)) { |
| 353 | /* |
| 354 | * all packets will fit or caller did not provide send |
| 355 | * full indication handler -- just move all of them |
| 356 | * to the local send_queue object |
| 357 | */ |
| 358 | list_splice_tail_init(txq, &send_queue); |
| 359 | } else { |
| 360 | good_pkts = get_queue_depth(txq) - overflow; |
| 361 | if (good_pkts < 0) { |
| 362 | WARN_ON_ONCE(1); |
| 363 | return HTC_SEND_QUEUE_DROP; |
| 364 | } |
| 365 | |
| 366 | /* we have overflowed, and a callback is provided */ |
| 367 | /* dequeue all non-overflow packets to the sendqueue */ |
| 368 | for (i = 0; i < good_pkts; i++) { |
| 369 | /* pop off caller's queue */ |
| 370 | packet = list_first_entry(txq, |
| 371 | struct htc_packet, |
| 372 | list); |
| 373 | /* move to local queue */ |
| 374 | list_move_tail(&packet->list, &send_queue); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * the caller's queue has all the packets that won't fit |
| 379 | * walk through the caller's queue and indicate each to |
| 380 | * the send full handler |
| 381 | */ |
| 382 | list_for_each_entry_safe(packet, tmp_pkt, |
| 383 | txq, list) { |
| 384 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 385 | "%s: Indicat overflowed TX pkts: %p\n", |
| 386 | __func__, packet); |
| 387 | action = ep->ep_cb.tx_full(ep->target, packet); |
| 388 | if (action == HTC_SEND_FULL_DROP) { |
| 389 | /* callback wants the packet dropped */ |
| 390 | ep->ep_st.tx_dropped += 1; |
| 391 | |
| 392 | /* leave this one in the caller's queue |
| 393 | * for cleanup */ |
| 394 | } else { |
| 395 | /* callback wants to keep this packet, |
| 396 | * move from caller's queue to the send |
| 397 | * queue */ |
| 398 | list_move_tail(&packet->list, |
| 399 | &send_queue); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | if (list_empty(&send_queue)) { |
| 404 | /* no packets made it in, caller will cleanup */ |
| 405 | return HTC_SEND_QUEUE_DROP; |
| 406 | } |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | if (!ep->pipe.tx_credit_flow_enabled) { |
| 411 | tx_resources = |
| 412 | ath6kl_hif_pipe_get_free_queue_number(ar, |
| 413 | ep->pipe.pipeid_ul); |
| 414 | } else { |
| 415 | tx_resources = 0; |
| 416 | } |
| 417 | |
| 418 | spin_lock_bh(&target->tx_lock); |
| 419 | if (!list_empty(&send_queue)) { |
| 420 | /* transfer packets to tail */ |
| 421 | list_splice_tail_init(&send_queue, &ep->txq); |
| 422 | if (!list_empty(&send_queue)) { |
| 423 | WARN_ON_ONCE(1); |
| 424 | spin_unlock_bh(&target->tx_lock); |
| 425 | return HTC_SEND_QUEUE_DROP; |
| 426 | } |
| 427 | INIT_LIST_HEAD(&send_queue); |
| 428 | } |
| 429 | |
| 430 | /* increment tx processing count on entry */ |
| 431 | ep->tx_proc_cnt++; |
| 432 | |
| 433 | if (ep->tx_proc_cnt > 1) { |
| 434 | /* |
| 435 | * Another thread or task is draining the TX queues on this |
| 436 | * endpoint that thread will reset the tx processing count |
| 437 | * when the queue is drained. |
| 438 | */ |
| 439 | ep->tx_proc_cnt--; |
| 440 | spin_unlock_bh(&target->tx_lock); |
| 441 | return HTC_SEND_QUEUE_OK; |
| 442 | } |
| 443 | |
| 444 | /***** beyond this point only 1 thread may enter ******/ |
| 445 | |
| 446 | /* |
| 447 | * Now drain the endpoint TX queue for transmission as long as we have |
| 448 | * enough transmit resources. |
| 449 | */ |
| 450 | while (true) { |
| 451 | if (get_queue_depth(&ep->txq) == 0) |
| 452 | break; |
| 453 | |
| 454 | if (ep->pipe.tx_credit_flow_enabled) { |
| 455 | /* |
| 456 | * Credit based mechanism provides flow control |
| 457 | * based on target transmit resource availability, |
| 458 | * we assume that the HIF layer will always have |
| 459 | * bus resources greater than target transmit |
| 460 | * resources. |
| 461 | */ |
| 462 | get_htc_packet_credit_based(target, ep, &send_queue); |
| 463 | } else { |
| 464 | /* |
| 465 | * Get all packets for this endpoint that we can |
| 466 | * for this pass. |
| 467 | */ |
| 468 | get_htc_packet(target, ep, &send_queue, tx_resources); |
| 469 | } |
| 470 | |
| 471 | if (get_queue_depth(&send_queue) == 0) { |
| 472 | /* |
| 473 | * Didn't get packets due to out of resources or TX |
| 474 | * queue was drained. |
| 475 | */ |
| 476 | break; |
| 477 | } |
| 478 | |
| 479 | spin_unlock_bh(&target->tx_lock); |
| 480 | |
| 481 | /* send what we can */ |
| 482 | htc_issue_packets(target, ep, &send_queue); |
| 483 | |
| 484 | if (!ep->pipe.tx_credit_flow_enabled) { |
| 485 | pipeid = ep->pipe.pipeid_ul; |
| 486 | tx_resources = |
| 487 | ath6kl_hif_pipe_get_free_queue_number(ar, pipeid); |
| 488 | } |
| 489 | |
| 490 | spin_lock_bh(&target->tx_lock); |
| 491 | } |
| 492 | |
| 493 | /* done with this endpoint, we can clear the count */ |
| 494 | ep->tx_proc_cnt = 0; |
| 495 | spin_unlock_bh(&target->tx_lock); |
| 496 | |
| 497 | return HTC_SEND_QUEUE_OK; |
| 498 | } |
| 499 | |
| 500 | /* htc control packet manipulation */ |
| 501 | static void destroy_htc_txctrl_packet(struct htc_packet *packet) |
| 502 | { |
| 503 | struct sk_buff *skb; |
| 504 | skb = packet->skb; |
| 505 | dev_kfree_skb(skb); |
| 506 | kfree(packet); |
| 507 | } |
| 508 | |
| 509 | static struct htc_packet *build_htc_txctrl_packet(void) |
| 510 | { |
| 511 | struct htc_packet *packet = NULL; |
| 512 | struct sk_buff *skb; |
| 513 | |
| 514 | packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL); |
| 515 | if (packet == NULL) |
| 516 | return NULL; |
| 517 | |
| 518 | skb = __dev_alloc_skb(HTC_CONTROL_BUFFER_SIZE, GFP_KERNEL); |
| 519 | |
| 520 | if (skb == NULL) { |
| 521 | kfree(packet); |
| 522 | return NULL; |
| 523 | } |
| 524 | packet->skb = skb; |
| 525 | |
| 526 | return packet; |
| 527 | } |
| 528 | |
| 529 | static void htc_free_txctrl_packet(struct htc_target *target, |
| 530 | struct htc_packet *packet) |
| 531 | { |
| 532 | destroy_htc_txctrl_packet(packet); |
| 533 | } |
| 534 | |
| 535 | static struct htc_packet *htc_alloc_txctrl_packet(struct htc_target *target) |
| 536 | { |
| 537 | return build_htc_txctrl_packet(); |
| 538 | } |
| 539 | |
| 540 | static void htc_txctrl_complete(struct htc_target *target, |
| 541 | struct htc_packet *packet) |
| 542 | { |
| 543 | htc_free_txctrl_packet(target, packet); |
| 544 | } |
| 545 | |
| 546 | #define MAX_MESSAGE_SIZE 1536 |
| 547 | |
| 548 | static int htc_setup_target_buffer_assignments(struct htc_target *target) |
| 549 | { |
| 550 | int status, credits, credit_per_maxmsg, i; |
| 551 | struct htc_pipe_txcredit_alloc *entry; |
| 552 | unsigned int hif_usbaudioclass = 0; |
| 553 | |
| 554 | credit_per_maxmsg = MAX_MESSAGE_SIZE / target->tgt_cred_sz; |
| 555 | if (MAX_MESSAGE_SIZE % target->tgt_cred_sz) |
| 556 | credit_per_maxmsg++; |
| 557 | |
| 558 | /* TODO, this should be configured by the caller! */ |
| 559 | |
| 560 | credits = target->tgt_creds; |
| 561 | entry = &target->pipe.txcredit_alloc[0]; |
| 562 | |
| 563 | status = -ENOMEM; |
| 564 | |
| 565 | /* FIXME: hif_usbaudioclass is always zero */ |
| 566 | if (hif_usbaudioclass) { |
| 567 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 568 | "%s: For USB Audio Class- Total:%d\n", |
| 569 | __func__, credits); |
| 570 | entry++; |
| 571 | entry++; |
| 572 | /* Setup VO Service To have Max Credits */ |
| 573 | entry->service_id = WMI_DATA_VO_SVC; |
| 574 | entry->credit_alloc = (credits - 6); |
| 575 | if (entry->credit_alloc == 0) |
| 576 | entry->credit_alloc++; |
| 577 | |
| 578 | credits -= (int) entry->credit_alloc; |
| 579 | if (credits <= 0) |
| 580 | return status; |
| 581 | |
| 582 | entry++; |
| 583 | entry->service_id = WMI_CONTROL_SVC; |
| 584 | entry->credit_alloc = credit_per_maxmsg; |
| 585 | credits -= (int) entry->credit_alloc; |
| 586 | if (credits <= 0) |
| 587 | return status; |
| 588 | |
| 589 | /* leftovers go to best effort */ |
| 590 | entry++; |
| 591 | entry++; |
| 592 | entry->service_id = WMI_DATA_BE_SVC; |
| 593 | entry->credit_alloc = (u8) credits; |
| 594 | status = 0; |
| 595 | } else { |
| 596 | entry++; |
| 597 | entry->service_id = WMI_DATA_VI_SVC; |
| 598 | entry->credit_alloc = credits / 4; |
| 599 | if (entry->credit_alloc == 0) |
| 600 | entry->credit_alloc++; |
| 601 | |
| 602 | credits -= (int) entry->credit_alloc; |
| 603 | if (credits <= 0) |
| 604 | return status; |
| 605 | |
| 606 | entry++; |
| 607 | entry->service_id = WMI_DATA_VO_SVC; |
| 608 | entry->credit_alloc = credits / 4; |
| 609 | if (entry->credit_alloc == 0) |
| 610 | entry->credit_alloc++; |
| 611 | |
| 612 | credits -= (int) entry->credit_alloc; |
| 613 | if (credits <= 0) |
| 614 | return status; |
| 615 | |
| 616 | entry++; |
| 617 | entry->service_id = WMI_CONTROL_SVC; |
| 618 | entry->credit_alloc = credit_per_maxmsg; |
| 619 | credits -= (int) entry->credit_alloc; |
| 620 | if (credits <= 0) |
| 621 | return status; |
| 622 | |
| 623 | entry++; |
| 624 | entry->service_id = WMI_DATA_BK_SVC; |
| 625 | entry->credit_alloc = credit_per_maxmsg; |
| 626 | credits -= (int) entry->credit_alloc; |
| 627 | if (credits <= 0) |
| 628 | return status; |
| 629 | |
| 630 | /* leftovers go to best effort */ |
| 631 | entry++; |
| 632 | entry->service_id = WMI_DATA_BE_SVC; |
| 633 | entry->credit_alloc = (u8) credits; |
| 634 | status = 0; |
| 635 | } |
| 636 | |
| 637 | if (status == 0) { |
| 638 | for (i = 0; i < ENDPOINT_MAX; i++) { |
| 639 | if (target->pipe.txcredit_alloc[i].service_id != 0) { |
| 640 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 641 | "HTC Service Index : %d TX : 0x%2.2X : alloc:%d\n", |
| 642 | i, |
| 643 | target->pipe.txcredit_alloc[i]. |
| 644 | service_id, |
| 645 | target->pipe.txcredit_alloc[i]. |
| 646 | credit_alloc); |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | return status; |
| 651 | } |
| 652 | |
| 653 | /* process credit reports and call distribution function */ |
| 654 | static void htc_process_credit_report(struct htc_target *target, |
| 655 | struct htc_credit_report *rpt, |
| 656 | int num_entries, |
| 657 | enum htc_endpoint_id from_ep) |
| 658 | { |
| 659 | int total_credits = 0, i; |
| 660 | struct htc_endpoint *ep; |
| 661 | |
| 662 | /* lock out TX while we update credits */ |
| 663 | spin_lock_bh(&target->tx_lock); |
| 664 | |
| 665 | for (i = 0; i < num_entries; i++, rpt++) { |
| 666 | if (rpt->eid >= ENDPOINT_MAX) { |
| 667 | WARN_ON_ONCE(1); |
| 668 | spin_unlock_bh(&target->tx_lock); |
| 669 | return; |
| 670 | } |
| 671 | |
| 672 | ep = &target->endpoint[rpt->eid]; |
| 673 | ep->cred_dist.credits += rpt->credits; |
| 674 | |
| 675 | if (ep->cred_dist.credits && get_queue_depth(&ep->txq)) { |
| 676 | spin_unlock_bh(&target->tx_lock); |
| 677 | htc_try_send(target, ep, NULL); |
| 678 | spin_lock_bh(&target->tx_lock); |
| 679 | } |
| 680 | |
| 681 | total_credits += rpt->credits; |
| 682 | } |
| 683 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 684 | "Report indicated %d credits to distribute\n", |
| 685 | total_credits); |
| 686 | |
| 687 | spin_unlock_bh(&target->tx_lock); |
| 688 | } |
| 689 | |
| 690 | /* flush endpoint TX queue */ |
| 691 | static void htc_flush_tx_endpoint(struct htc_target *target, |
| 692 | struct htc_endpoint *ep, u16 tag) |
| 693 | { |
| 694 | struct htc_packet *packet; |
| 695 | |
| 696 | spin_lock_bh(&target->tx_lock); |
| 697 | while (get_queue_depth(&ep->txq)) { |
| 698 | packet = list_first_entry(&ep->txq, struct htc_packet, list); |
| 699 | list_del(&packet->list); |
| 700 | packet->status = 0; |
| 701 | send_packet_completion(target, packet); |
| 702 | } |
| 703 | spin_unlock_bh(&target->tx_lock); |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * In the adapted HIF layer, struct sk_buff * are passed between HIF and HTC, |
| 708 | * since upper layers expects struct htc_packet containers we use the completed |
| 709 | * skb and lookup it's corresponding HTC packet buffer from a lookup list. |
| 710 | * This is extra overhead that can be fixed by re-aligning HIF interfaces with |
| 711 | * HTC. |
| 712 | */ |
| 713 | static struct htc_packet *htc_lookup_tx_packet(struct htc_target *target, |
| 714 | struct htc_endpoint *ep, |
| 715 | struct sk_buff *skb) |
| 716 | { |
| 717 | struct htc_packet *packet, *tmp_pkt, *found_packet = NULL; |
| 718 | |
| 719 | spin_lock_bh(&target->tx_lock); |
| 720 | |
| 721 | /* |
| 722 | * interate from the front of tx lookup queue |
| 723 | * this lookup should be fast since lower layers completes in-order and |
| 724 | * so the completed packet should be at the head of the list generally |
| 725 | */ |
| 726 | list_for_each_entry_safe(packet, tmp_pkt, &ep->pipe.tx_lookup_queue, |
| 727 | list) { |
| 728 | /* check for removal */ |
| 729 | if (skb == packet->skb) { |
| 730 | /* found it */ |
| 731 | list_del(&packet->list); |
| 732 | found_packet = packet; |
| 733 | break; |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | spin_unlock_bh(&target->tx_lock); |
| 738 | |
| 739 | return found_packet; |
| 740 | } |
| 741 | |
| 742 | static int ath6kl_htc_pipe_tx_complete(struct ath6kl *ar, struct sk_buff *skb) |
| 743 | { |
| 744 | struct htc_target *target = ar->htc_target; |
| 745 | struct htc_frame_hdr *htc_hdr; |
| 746 | struct htc_endpoint *ep; |
| 747 | struct htc_packet *packet; |
| 748 | u8 ep_id, *netdata; |
| 749 | u32 netlen; |
| 750 | |
| 751 | netdata = skb->data; |
| 752 | netlen = skb->len; |
| 753 | |
| 754 | htc_hdr = (struct htc_frame_hdr *) netdata; |
| 755 | |
| 756 | ep_id = htc_hdr->eid; |
| 757 | ep = &target->endpoint[ep_id]; |
| 758 | |
| 759 | packet = htc_lookup_tx_packet(target, ep, skb); |
| 760 | if (packet == NULL) { |
| 761 | /* may have already been flushed and freed */ |
| 762 | ath6kl_err("HTC TX lookup failed!\n"); |
| 763 | } else { |
| 764 | /* will be giving this buffer back to upper layers */ |
| 765 | packet->status = 0; |
| 766 | send_packet_completion(target, packet); |
| 767 | } |
| 768 | skb = NULL; |
| 769 | |
| 770 | if (!ep->pipe.tx_credit_flow_enabled) { |
| 771 | /* |
| 772 | * note: when using TX credit flow, the re-checking of queues |
| 773 | * happens when credits flow back from the target. in the |
| 774 | * non-TX credit case, we recheck after the packet completes |
| 775 | */ |
| 776 | htc_try_send(target, ep, NULL); |
| 777 | } |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | static int htc_send_packets_multiple(struct htc_target *target, |
| 783 | struct list_head *pkt_queue) |
| 784 | { |
| 785 | struct htc_endpoint *ep; |
| 786 | struct htc_packet *packet, *tmp_pkt; |
| 787 | |
| 788 | if (list_empty(pkt_queue)) |
| 789 | return -EINVAL; |
| 790 | |
| 791 | /* get first packet to find out which ep the packets will go into */ |
| 792 | packet = list_first_entry(pkt_queue, struct htc_packet, list); |
| 793 | |
| 794 | if (packet->endpoint >= ENDPOINT_MAX) { |
| 795 | WARN_ON_ONCE(1); |
| 796 | return -EINVAL; |
| 797 | } |
| 798 | ep = &target->endpoint[packet->endpoint]; |
| 799 | |
| 800 | htc_try_send(target, ep, pkt_queue); |
| 801 | |
| 802 | /* do completion on any packets that couldn't get in */ |
| 803 | if (!list_empty(pkt_queue)) { |
| 804 | list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { |
| 805 | packet->status = -ENOMEM; |
| 806 | } |
| 807 | |
| 808 | do_send_completion(ep, pkt_queue); |
| 809 | } |
| 810 | |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | /* htc pipe rx path */ |
| 815 | static struct htc_packet *alloc_htc_packet_container(struct htc_target *target) |
| 816 | { |
| 817 | struct htc_packet *packet; |
| 818 | spin_lock_bh(&target->rx_lock); |
| 819 | |
| 820 | if (target->pipe.htc_packet_pool == NULL) { |
| 821 | spin_unlock_bh(&target->rx_lock); |
| 822 | return NULL; |
| 823 | } |
| 824 | |
| 825 | packet = target->pipe.htc_packet_pool; |
| 826 | target->pipe.htc_packet_pool = (struct htc_packet *) packet->list.next; |
| 827 | |
| 828 | spin_unlock_bh(&target->rx_lock); |
| 829 | |
| 830 | packet->list.next = NULL; |
| 831 | return packet; |
| 832 | } |
| 833 | |
| 834 | static void free_htc_packet_container(struct htc_target *target, |
| 835 | struct htc_packet *packet) |
| 836 | { |
| 837 | struct list_head *lh; |
| 838 | |
| 839 | spin_lock_bh(&target->rx_lock); |
| 840 | |
| 841 | if (target->pipe.htc_packet_pool == NULL) { |
| 842 | target->pipe.htc_packet_pool = packet; |
| 843 | packet->list.next = NULL; |
| 844 | } else { |
| 845 | lh = (struct list_head *) target->pipe.htc_packet_pool; |
| 846 | packet->list.next = lh; |
| 847 | target->pipe.htc_packet_pool = packet; |
| 848 | } |
| 849 | |
| 850 | spin_unlock_bh(&target->rx_lock); |
| 851 | } |
| 852 | |
| 853 | static int htc_process_trailer(struct htc_target *target, u8 *buffer, |
| 854 | int len, enum htc_endpoint_id from_ep) |
| 855 | { |
| 856 | struct htc_credit_report *report; |
| 857 | struct htc_record_hdr *record; |
| 858 | u8 *record_buf, *orig_buf; |
| 859 | int orig_len, status; |
| 860 | |
| 861 | orig_buf = buffer; |
| 862 | orig_len = len; |
| 863 | status = 0; |
| 864 | |
| 865 | while (len > 0) { |
| 866 | if (len < sizeof(struct htc_record_hdr)) { |
| 867 | status = -EINVAL; |
| 868 | break; |
| 869 | } |
| 870 | |
| 871 | /* these are byte aligned structs */ |
| 872 | record = (struct htc_record_hdr *) buffer; |
| 873 | len -= sizeof(struct htc_record_hdr); |
| 874 | buffer += sizeof(struct htc_record_hdr); |
| 875 | |
| 876 | if (record->len > len) { |
| 877 | /* no room left in buffer for record */ |
| 878 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 879 | "invalid length: %d (id:%d) buffer has: %d bytes left\n", |
| 880 | record->len, record->rec_id, len); |
| 881 | status = -EINVAL; |
| 882 | break; |
| 883 | } |
| 884 | |
| 885 | /* start of record follows the header */ |
| 886 | record_buf = buffer; |
| 887 | |
| 888 | switch (record->rec_id) { |
| 889 | case HTC_RECORD_CREDITS: |
| 890 | if (record->len < sizeof(struct htc_credit_report)) { |
| 891 | WARN_ON_ONCE(1); |
| 892 | return -EINVAL; |
| 893 | } |
| 894 | |
| 895 | report = (struct htc_credit_report *) record_buf; |
| 896 | htc_process_credit_report(target, report, |
| 897 | record->len / sizeof(*report), |
| 898 | from_ep); |
| 899 | break; |
| 900 | default: |
| 901 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 902 | "unhandled record: id:%d length:%d\n", |
| 903 | record->rec_id, record->len); |
| 904 | break; |
| 905 | } |
| 906 | |
| 907 | if (status != 0) |
| 908 | break; |
| 909 | |
| 910 | /* advance buffer past this record for next time around */ |
| 911 | buffer += record->len; |
| 912 | len -= record->len; |
| 913 | } |
| 914 | |
| 915 | return status; |
| 916 | } |
| 917 | |
| 918 | static void do_recv_completion(struct htc_endpoint *ep, |
| 919 | struct list_head *queue_to_indicate) |
| 920 | { |
| 921 | struct htc_packet *packet; |
| 922 | |
| 923 | if (list_empty(queue_to_indicate)) { |
| 924 | /* nothing to indicate */ |
| 925 | return; |
| 926 | } |
| 927 | |
| 928 | /* using legacy EpRecv */ |
| 929 | while (!list_empty(queue_to_indicate)) { |
| 930 | packet = list_first_entry(queue_to_indicate, |
| 931 | struct htc_packet, list); |
| 932 | list_del(&packet->list); |
| 933 | ep->ep_cb.rx(ep->target, packet); |
| 934 | } |
| 935 | |
| 936 | return; |
| 937 | } |
| 938 | |
| 939 | static void recv_packet_completion(struct htc_target *target, |
| 940 | struct htc_endpoint *ep, |
| 941 | struct htc_packet *packet) |
| 942 | { |
| 943 | struct list_head container; |
| 944 | INIT_LIST_HEAD(&container); |
| 945 | list_add_tail(&packet->list, &container); |
| 946 | |
| 947 | /* do completion */ |
| 948 | do_recv_completion(ep, &container); |
| 949 | } |
| 950 | |
| 951 | static int ath6kl_htc_pipe_rx_complete(struct ath6kl *ar, struct sk_buff *skb, |
| 952 | u8 pipeid) |
| 953 | { |
| 954 | struct htc_target *target = ar->htc_target; |
| 955 | u8 *netdata, *trailer, hdr_info; |
| 956 | struct htc_frame_hdr *htc_hdr; |
| 957 | u32 netlen, trailerlen = 0; |
| 958 | struct htc_packet *packet; |
| 959 | struct htc_endpoint *ep; |
| 960 | u16 payload_len; |
| 961 | int status = 0; |
| 962 | |
| 963 | /* |
| 964 | * ar->htc_target can be NULL due to a race condition that can occur |
| 965 | * during driver initialization(we do 'ath6kl_hif_power_on' before |
| 966 | * initializing 'ar->htc_target' via 'ath6kl_htc_create'). |
| 967 | * 'ath6kl_hif_power_on' assigns 'ath6kl_recv_complete' as |
| 968 | * usb_complete_t/callback function for 'usb_fill_bulk_urb'. |
| 969 | * Thus the possibility of ar->htc_target being NULL |
| 970 | * via ath6kl_recv_complete -> ath6kl_usb_io_comp_work. |
| 971 | */ |
| 972 | if (WARN_ON_ONCE(!target)) { |
| 973 | ath6kl_err("Target not yet initialized\n"); |
| 974 | status = -EINVAL; |
| 975 | goto free_skb; |
| 976 | } |
| 977 | |
| 978 | |
| 979 | netdata = skb->data; |
| 980 | netlen = skb->len; |
| 981 | |
| 982 | htc_hdr = (struct htc_frame_hdr *) netdata; |
| 983 | |
| 984 | if (htc_hdr->eid >= ENDPOINT_MAX) { |
| 985 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 986 | "HTC Rx: invalid EndpointID=%d\n", |
| 987 | htc_hdr->eid); |
| 988 | status = -EINVAL; |
| 989 | goto free_skb; |
| 990 | } |
| 991 | ep = &target->endpoint[htc_hdr->eid]; |
| 992 | |
| 993 | payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len)); |
| 994 | |
| 995 | if (netlen < (payload_len + HTC_HDR_LENGTH)) { |
| 996 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 997 | "HTC Rx: insufficient length, got:%d expected =%zu\n", |
| 998 | netlen, payload_len + HTC_HDR_LENGTH); |
| 999 | status = -EINVAL; |
| 1000 | goto free_skb; |
| 1001 | } |
| 1002 | |
| 1003 | /* get flags to check for trailer */ |
| 1004 | hdr_info = htc_hdr->flags; |
| 1005 | if (hdr_info & HTC_FLG_RX_TRAILER) { |
| 1006 | /* extract the trailer length */ |
| 1007 | hdr_info = htc_hdr->ctrl[0]; |
| 1008 | if ((hdr_info < sizeof(struct htc_record_hdr)) || |
| 1009 | (hdr_info > payload_len)) { |
| 1010 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1011 | "invalid header: payloadlen should be %d, CB[0]: %d\n", |
| 1012 | payload_len, hdr_info); |
| 1013 | status = -EINVAL; |
| 1014 | goto free_skb; |
| 1015 | } |
| 1016 | |
| 1017 | trailerlen = hdr_info; |
| 1018 | /* process trailer after hdr/apps payload */ |
| 1019 | trailer = (u8 *) htc_hdr + HTC_HDR_LENGTH + |
| 1020 | payload_len - hdr_info; |
| 1021 | status = htc_process_trailer(target, trailer, hdr_info, |
| 1022 | htc_hdr->eid); |
| 1023 | if (status != 0) |
| 1024 | goto free_skb; |
| 1025 | } |
| 1026 | |
| 1027 | if (((int) payload_len - (int) trailerlen) <= 0) { |
| 1028 | /* zero length packet with trailer, just drop these */ |
| 1029 | goto free_skb; |
| 1030 | } |
| 1031 | |
| 1032 | if (htc_hdr->eid == ENDPOINT_0) { |
| 1033 | /* handle HTC control message */ |
| 1034 | if (target->htc_flags & HTC_OP_STATE_SETUP_COMPLETE) { |
| 1035 | /* |
| 1036 | * fatal: target should not send unsolicited |
| 1037 | * messageson the endpoint 0 |
| 1038 | */ |
| 1039 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1040 | "HTC ignores Rx Ctrl after setup complete\n"); |
| 1041 | status = -EINVAL; |
| 1042 | goto free_skb; |
| 1043 | } |
| 1044 | |
| 1045 | /* remove HTC header */ |
| 1046 | skb_pull(skb, HTC_HDR_LENGTH); |
| 1047 | |
| 1048 | netdata = skb->data; |
| 1049 | netlen = skb->len; |
| 1050 | |
| 1051 | spin_lock_bh(&target->rx_lock); |
| 1052 | |
| 1053 | target->pipe.ctrl_response_valid = true; |
| 1054 | target->pipe.ctrl_response_len = min_t(int, netlen, |
| 1055 | HTC_MAX_CTRL_MSG_LEN); |
| 1056 | memcpy(target->pipe.ctrl_response_buf, netdata, |
| 1057 | target->pipe.ctrl_response_len); |
| 1058 | |
| 1059 | spin_unlock_bh(&target->rx_lock); |
| 1060 | |
| 1061 | dev_kfree_skb(skb); |
| 1062 | skb = NULL; |
| 1063 | |
| 1064 | goto free_skb; |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * TODO: the message based HIF architecture allocates net bufs |
| 1069 | * for recv packets since it bridges that HIF to upper layers, |
| 1070 | * which expects HTC packets, we form the packets here |
| 1071 | */ |
| 1072 | packet = alloc_htc_packet_container(target); |
| 1073 | if (packet == NULL) { |
| 1074 | status = -ENOMEM; |
| 1075 | goto free_skb; |
| 1076 | } |
| 1077 | |
| 1078 | packet->status = 0; |
| 1079 | packet->endpoint = htc_hdr->eid; |
| 1080 | packet->pkt_cntxt = skb; |
| 1081 | |
| 1082 | /* TODO: for backwards compatibility */ |
| 1083 | packet->buf = skb_push(skb, 0) + HTC_HDR_LENGTH; |
| 1084 | packet->act_len = netlen - HTC_HDR_LENGTH - trailerlen; |
| 1085 | |
| 1086 | /* |
| 1087 | * TODO: this is a hack because the driver layer will set the |
| 1088 | * actual len of the skb again which will just double the len |
| 1089 | */ |
| 1090 | skb_trim(skb, 0); |
| 1091 | |
| 1092 | recv_packet_completion(target, ep, packet); |
| 1093 | |
| 1094 | /* recover the packet container */ |
| 1095 | free_htc_packet_container(target, packet); |
| 1096 | skb = NULL; |
| 1097 | |
| 1098 | free_skb: |
| 1099 | dev_kfree_skb(skb); |
| 1100 | |
| 1101 | return status; |
| 1102 | } |
| 1103 | |
| 1104 | static void htc_flush_rx_queue(struct htc_target *target, |
| 1105 | struct htc_endpoint *ep) |
| 1106 | { |
| 1107 | struct list_head container; |
| 1108 | struct htc_packet *packet; |
| 1109 | |
| 1110 | spin_lock_bh(&target->rx_lock); |
| 1111 | |
| 1112 | while (1) { |
| 1113 | if (list_empty(&ep->rx_bufq)) |
| 1114 | break; |
| 1115 | |
| 1116 | packet = list_first_entry(&ep->rx_bufq, |
| 1117 | struct htc_packet, list); |
| 1118 | list_del(&packet->list); |
| 1119 | |
| 1120 | spin_unlock_bh(&target->rx_lock); |
| 1121 | packet->status = -ECANCELED; |
| 1122 | packet->act_len = 0; |
| 1123 | |
| 1124 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1125 | "Flushing RX packet:0x%p, length:%d, ep:%d\n", |
| 1126 | packet, packet->buf_len, |
| 1127 | packet->endpoint); |
| 1128 | |
| 1129 | INIT_LIST_HEAD(&container); |
| 1130 | list_add_tail(&packet->list, &container); |
| 1131 | |
| 1132 | /* give the packet back */ |
| 1133 | do_recv_completion(ep, &container); |
| 1134 | spin_lock_bh(&target->rx_lock); |
| 1135 | } |
| 1136 | |
| 1137 | spin_unlock_bh(&target->rx_lock); |
| 1138 | } |
| 1139 | |
| 1140 | /* polling routine to wait for a control packet to be received */ |
| 1141 | static int htc_wait_recv_ctrl_message(struct htc_target *target) |
| 1142 | { |
| 1143 | int count = HTC_TARGET_RESPONSE_POLL_COUNT; |
| 1144 | |
| 1145 | while (count > 0) { |
| 1146 | spin_lock_bh(&target->rx_lock); |
| 1147 | |
| 1148 | if (target->pipe.ctrl_response_valid) { |
| 1149 | target->pipe.ctrl_response_valid = false; |
| 1150 | spin_unlock_bh(&target->rx_lock); |
| 1151 | break; |
| 1152 | } |
| 1153 | |
| 1154 | spin_unlock_bh(&target->rx_lock); |
| 1155 | |
| 1156 | count--; |
| 1157 | |
| 1158 | msleep_interruptible(HTC_TARGET_RESPONSE_POLL_WAIT); |
| 1159 | } |
| 1160 | |
| 1161 | if (count <= 0) { |
| 1162 | ath6kl_warn("htc pipe control receive timeout!\n"); |
| 1163 | return -ETIMEDOUT; |
| 1164 | } |
| 1165 | |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
| 1169 | static void htc_rxctrl_complete(struct htc_target *context, |
| 1170 | struct htc_packet *packet) |
| 1171 | { |
| 1172 | struct sk_buff *skb = packet->skb; |
| 1173 | |
| 1174 | if (packet->endpoint == ENDPOINT_0 && |
| 1175 | packet->status == -ECANCELED && |
| 1176 | skb != NULL) |
| 1177 | dev_kfree_skb(skb); |
| 1178 | } |
| 1179 | |
| 1180 | /* htc pipe initialization */ |
| 1181 | static void reset_endpoint_states(struct htc_target *target) |
| 1182 | { |
| 1183 | struct htc_endpoint *ep; |
| 1184 | int i; |
| 1185 | |
| 1186 | for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { |
| 1187 | ep = &target->endpoint[i]; |
| 1188 | ep->svc_id = 0; |
| 1189 | ep->len_max = 0; |
| 1190 | ep->max_txq_depth = 0; |
| 1191 | ep->eid = i; |
| 1192 | INIT_LIST_HEAD(&ep->txq); |
| 1193 | INIT_LIST_HEAD(&ep->pipe.tx_lookup_queue); |
| 1194 | INIT_LIST_HEAD(&ep->rx_bufq); |
| 1195 | ep->target = target; |
| 1196 | ep->pipe.tx_credit_flow_enabled = true; |
| 1197 | } |
| 1198 | } |
| 1199 | |
| 1200 | /* start HTC, this is called after all services are connected */ |
| 1201 | static int htc_config_target_hif_pipe(struct htc_target *target) |
| 1202 | { |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | /* htc service functions */ |
| 1207 | static u8 htc_get_credit_alloc(struct htc_target *target, u16 service_id) |
| 1208 | { |
| 1209 | u8 allocation = 0; |
| 1210 | int i; |
| 1211 | |
| 1212 | for (i = 0; i < ENDPOINT_MAX; i++) { |
| 1213 | if (target->pipe.txcredit_alloc[i].service_id == service_id) |
| 1214 | allocation = |
| 1215 | target->pipe.txcredit_alloc[i].credit_alloc; |
| 1216 | } |
| 1217 | |
| 1218 | if (allocation == 0) { |
| 1219 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1220 | "HTC Service TX : 0x%2.2X : allocation is zero!\n", |
| 1221 | service_id); |
| 1222 | } |
| 1223 | |
| 1224 | return allocation; |
| 1225 | } |
| 1226 | |
| 1227 | static int ath6kl_htc_pipe_conn_service(struct htc_target *target, |
| 1228 | struct htc_service_connect_req *conn_req, |
| 1229 | struct htc_service_connect_resp *conn_resp) |
| 1230 | { |
| 1231 | struct ath6kl *ar = target->dev->ar; |
| 1232 | struct htc_packet *packet = NULL; |
| 1233 | struct htc_conn_service_resp *resp_msg; |
| 1234 | struct htc_conn_service_msg *conn_msg; |
| 1235 | enum htc_endpoint_id assigned_epid = ENDPOINT_MAX; |
| 1236 | bool disable_credit_flowctrl = false; |
| 1237 | unsigned int max_msg_size = 0; |
| 1238 | struct htc_endpoint *ep; |
| 1239 | int length, status = 0; |
| 1240 | struct sk_buff *skb; |
| 1241 | u8 tx_alloc; |
| 1242 | u16 flags; |
| 1243 | |
| 1244 | if (conn_req->svc_id == 0) { |
| 1245 | WARN_ON_ONCE(1); |
| 1246 | status = -EINVAL; |
| 1247 | goto free_packet; |
| 1248 | } |
| 1249 | |
| 1250 | if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) { |
| 1251 | /* special case for pseudo control service */ |
| 1252 | assigned_epid = ENDPOINT_0; |
| 1253 | max_msg_size = HTC_MAX_CTRL_MSG_LEN; |
| 1254 | tx_alloc = 0; |
| 1255 | |
| 1256 | } else { |
| 1257 | tx_alloc = htc_get_credit_alloc(target, conn_req->svc_id); |
| 1258 | if (tx_alloc == 0) { |
| 1259 | status = -ENOMEM; |
| 1260 | goto free_packet; |
| 1261 | } |
| 1262 | |
| 1263 | /* allocate a packet to send to the target */ |
| 1264 | packet = htc_alloc_txctrl_packet(target); |
| 1265 | |
| 1266 | if (packet == NULL) { |
| 1267 | WARN_ON_ONCE(1); |
| 1268 | status = -ENOMEM; |
| 1269 | goto free_packet; |
| 1270 | } |
| 1271 | |
| 1272 | skb = packet->skb; |
| 1273 | length = sizeof(struct htc_conn_service_msg); |
| 1274 | |
| 1275 | /* assemble connect service message */ |
| 1276 | conn_msg = skb_put(skb, length); |
| 1277 | if (conn_msg == NULL) { |
| 1278 | WARN_ON_ONCE(1); |
| 1279 | status = -EINVAL; |
| 1280 | goto free_packet; |
| 1281 | } |
| 1282 | |
| 1283 | memset(conn_msg, 0, |
| 1284 | sizeof(struct htc_conn_service_msg)); |
| 1285 | conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID); |
| 1286 | conn_msg->svc_id = cpu_to_le16(conn_req->svc_id); |
| 1287 | conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags & |
| 1288 | ~HTC_CONN_FLGS_SET_RECV_ALLOC_MASK); |
| 1289 | |
| 1290 | /* tell target desired recv alloc for this ep */ |
| 1291 | flags = tx_alloc << HTC_CONN_FLGS_SET_RECV_ALLOC_SHIFT; |
| 1292 | conn_msg->conn_flags |= cpu_to_le16(flags); |
| 1293 | |
| 1294 | if (conn_req->conn_flags & |
| 1295 | HTC_CONN_FLGS_DISABLE_CRED_FLOW_CTRL) { |
| 1296 | disable_credit_flowctrl = true; |
| 1297 | } |
| 1298 | |
| 1299 | set_htc_pkt_info(packet, NULL, (u8 *) conn_msg, |
| 1300 | length, |
| 1301 | ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); |
| 1302 | |
| 1303 | status = ath6kl_htc_pipe_tx(target, packet); |
| 1304 | |
| 1305 | /* we don't own it anymore */ |
| 1306 | packet = NULL; |
| 1307 | if (status != 0) |
| 1308 | goto free_packet; |
| 1309 | |
| 1310 | /* wait for response */ |
| 1311 | status = htc_wait_recv_ctrl_message(target); |
| 1312 | if (status != 0) |
| 1313 | goto free_packet; |
| 1314 | |
| 1315 | /* we controlled the buffer creation so it has to be |
| 1316 | * properly aligned |
| 1317 | */ |
| 1318 | resp_msg = (struct htc_conn_service_resp *) |
| 1319 | target->pipe.ctrl_response_buf; |
| 1320 | |
| 1321 | if (resp_msg->msg_id != cpu_to_le16(HTC_MSG_CONN_SVC_RESP_ID) || |
| 1322 | (target->pipe.ctrl_response_len < sizeof(*resp_msg))) { |
| 1323 | /* this message is not valid */ |
| 1324 | WARN_ON_ONCE(1); |
| 1325 | status = -EINVAL; |
| 1326 | goto free_packet; |
| 1327 | } |
| 1328 | |
| 1329 | ath6kl_dbg(ATH6KL_DBG_TRC, |
| 1330 | "%s: service 0x%X conn resp: status: %d ep: %d\n", |
| 1331 | __func__, resp_msg->svc_id, resp_msg->status, |
| 1332 | resp_msg->eid); |
| 1333 | |
| 1334 | conn_resp->resp_code = resp_msg->status; |
| 1335 | /* check response status */ |
| 1336 | if (resp_msg->status != HTC_SERVICE_SUCCESS) { |
| 1337 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1338 | "Target failed service 0x%X connect request (status:%d)\n", |
| 1339 | resp_msg->svc_id, resp_msg->status); |
| 1340 | status = -EINVAL; |
| 1341 | goto free_packet; |
| 1342 | } |
| 1343 | |
| 1344 | assigned_epid = (enum htc_endpoint_id) resp_msg->eid; |
| 1345 | max_msg_size = le16_to_cpu(resp_msg->max_msg_sz); |
| 1346 | } |
| 1347 | |
| 1348 | /* the rest are parameter checks so set the error status */ |
| 1349 | status = -EINVAL; |
| 1350 | |
| 1351 | if (assigned_epid >= ENDPOINT_MAX) { |
| 1352 | WARN_ON_ONCE(1); |
| 1353 | goto free_packet; |
| 1354 | } |
| 1355 | |
| 1356 | if (max_msg_size == 0) { |
| 1357 | WARN_ON_ONCE(1); |
| 1358 | goto free_packet; |
| 1359 | } |
| 1360 | |
| 1361 | ep = &target->endpoint[assigned_epid]; |
| 1362 | ep->eid = assigned_epid; |
| 1363 | if (ep->svc_id != 0) { |
| 1364 | /* endpoint already in use! */ |
| 1365 | WARN_ON_ONCE(1); |
| 1366 | goto free_packet; |
| 1367 | } |
| 1368 | |
| 1369 | /* return assigned endpoint to caller */ |
| 1370 | conn_resp->endpoint = assigned_epid; |
| 1371 | conn_resp->len_max = max_msg_size; |
| 1372 | |
| 1373 | /* setup the endpoint */ |
| 1374 | ep->svc_id = conn_req->svc_id; /* this marks ep in use */ |
| 1375 | ep->max_txq_depth = conn_req->max_txq_depth; |
| 1376 | ep->len_max = max_msg_size; |
| 1377 | ep->cred_dist.credits = tx_alloc; |
| 1378 | ep->cred_dist.cred_sz = target->tgt_cred_sz; |
| 1379 | ep->cred_dist.cred_per_msg = max_msg_size / target->tgt_cred_sz; |
| 1380 | if (max_msg_size % target->tgt_cred_sz) |
| 1381 | ep->cred_dist.cred_per_msg++; |
| 1382 | |
| 1383 | /* copy all the callbacks */ |
| 1384 | ep->ep_cb = conn_req->ep_cb; |
| 1385 | |
| 1386 | /* initialize tx_drop_packet_threshold */ |
| 1387 | ep->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM; |
| 1388 | |
| 1389 | status = ath6kl_hif_pipe_map_service(ar, ep->svc_id, |
| 1390 | &ep->pipe.pipeid_ul, |
| 1391 | &ep->pipe.pipeid_dl); |
| 1392 | if (status != 0) |
| 1393 | goto free_packet; |
| 1394 | |
| 1395 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1396 | "SVC Ready: 0x%4.4X: ULpipe:%d DLpipe:%d id:%d\n", |
| 1397 | ep->svc_id, ep->pipe.pipeid_ul, |
| 1398 | ep->pipe.pipeid_dl, ep->eid); |
| 1399 | |
| 1400 | if (disable_credit_flowctrl && ep->pipe.tx_credit_flow_enabled) { |
| 1401 | ep->pipe.tx_credit_flow_enabled = false; |
| 1402 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1403 | "SVC: 0x%4.4X ep:%d TX flow control off\n", |
| 1404 | ep->svc_id, assigned_epid); |
| 1405 | } |
| 1406 | |
| 1407 | free_packet: |
| 1408 | if (packet != NULL) |
| 1409 | htc_free_txctrl_packet(target, packet); |
| 1410 | return status; |
| 1411 | } |
| 1412 | |
| 1413 | /* htc export functions */ |
| 1414 | static void *ath6kl_htc_pipe_create(struct ath6kl *ar) |
| 1415 | { |
| 1416 | int status = 0; |
| 1417 | struct htc_endpoint *ep = NULL; |
| 1418 | struct htc_target *target = NULL; |
| 1419 | struct htc_packet *packet; |
| 1420 | int i; |
| 1421 | |
| 1422 | target = kzalloc(sizeof(struct htc_target), GFP_KERNEL); |
| 1423 | if (target == NULL) { |
| 1424 | ath6kl_err("htc create unable to allocate memory\n"); |
| 1425 | status = -ENOMEM; |
| 1426 | goto fail_htc_create; |
| 1427 | } |
| 1428 | |
| 1429 | spin_lock_init(&target->htc_lock); |
| 1430 | spin_lock_init(&target->rx_lock); |
| 1431 | spin_lock_init(&target->tx_lock); |
| 1432 | |
| 1433 | reset_endpoint_states(target); |
| 1434 | |
| 1435 | for (i = 0; i < HTC_PACKET_CONTAINER_ALLOCATION; i++) { |
| 1436 | packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL); |
| 1437 | |
| 1438 | if (packet != NULL) |
| 1439 | free_htc_packet_container(target, packet); |
| 1440 | } |
| 1441 | |
| 1442 | target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL); |
| 1443 | if (!target->dev) { |
| 1444 | ath6kl_err("unable to allocate memory\n"); |
| 1445 | status = -ENOMEM; |
| 1446 | goto fail_htc_create; |
| 1447 | } |
| 1448 | target->dev->ar = ar; |
| 1449 | target->dev->htc_cnxt = target; |
| 1450 | |
| 1451 | /* Get HIF default pipe for HTC message exchange */ |
| 1452 | ep = &target->endpoint[ENDPOINT_0]; |
| 1453 | |
| 1454 | ath6kl_hif_pipe_get_default(ar, &ep->pipe.pipeid_ul, |
| 1455 | &ep->pipe.pipeid_dl); |
| 1456 | |
| 1457 | return target; |
| 1458 | |
| 1459 | fail_htc_create: |
| 1460 | if (status != 0) { |
| 1461 | if (target != NULL) |
| 1462 | ath6kl_htc_pipe_cleanup(target); |
| 1463 | |
| 1464 | target = NULL; |
| 1465 | } |
| 1466 | return target; |
| 1467 | } |
| 1468 | |
| 1469 | /* cleanup the HTC instance */ |
| 1470 | static void ath6kl_htc_pipe_cleanup(struct htc_target *target) |
| 1471 | { |
| 1472 | struct htc_packet *packet; |
| 1473 | |
| 1474 | while (true) { |
| 1475 | packet = alloc_htc_packet_container(target); |
| 1476 | if (packet == NULL) |
| 1477 | break; |
| 1478 | kfree(packet); |
| 1479 | } |
| 1480 | |
| 1481 | kfree(target->dev); |
| 1482 | |
| 1483 | /* kfree our instance */ |
| 1484 | kfree(target); |
| 1485 | } |
| 1486 | |
| 1487 | static int ath6kl_htc_pipe_start(struct htc_target *target) |
| 1488 | { |
| 1489 | struct sk_buff *skb; |
| 1490 | struct htc_setup_comp_ext_msg *setup; |
| 1491 | struct htc_packet *packet; |
| 1492 | |
| 1493 | htc_config_target_hif_pipe(target); |
| 1494 | |
| 1495 | /* allocate a buffer to send */ |
| 1496 | packet = htc_alloc_txctrl_packet(target); |
| 1497 | if (packet == NULL) { |
| 1498 | WARN_ON_ONCE(1); |
| 1499 | return -ENOMEM; |
| 1500 | } |
| 1501 | |
| 1502 | skb = packet->skb; |
| 1503 | |
| 1504 | /* assemble setup complete message */ |
| 1505 | setup = skb_put(skb, sizeof(*setup)); |
| 1506 | memset(setup, 0, sizeof(struct htc_setup_comp_ext_msg)); |
| 1507 | setup->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID); |
| 1508 | |
| 1509 | ath6kl_dbg(ATH6KL_DBG_HTC, "HTC using TX credit flow control\n"); |
| 1510 | |
| 1511 | set_htc_pkt_info(packet, NULL, (u8 *) setup, |
| 1512 | sizeof(struct htc_setup_comp_ext_msg), |
| 1513 | ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG); |
| 1514 | |
| 1515 | target->htc_flags |= HTC_OP_STATE_SETUP_COMPLETE; |
| 1516 | |
| 1517 | return ath6kl_htc_pipe_tx(target, packet); |
| 1518 | } |
| 1519 | |
| 1520 | static void ath6kl_htc_pipe_stop(struct htc_target *target) |
| 1521 | { |
| 1522 | int i; |
| 1523 | struct htc_endpoint *ep; |
| 1524 | |
| 1525 | /* cleanup endpoints */ |
| 1526 | for (i = 0; i < ENDPOINT_MAX; i++) { |
| 1527 | ep = &target->endpoint[i]; |
| 1528 | htc_flush_rx_queue(target, ep); |
| 1529 | htc_flush_tx_endpoint(target, ep, HTC_TX_PACKET_TAG_ALL); |
| 1530 | } |
| 1531 | |
| 1532 | reset_endpoint_states(target); |
| 1533 | target->htc_flags &= ~HTC_OP_STATE_SETUP_COMPLETE; |
| 1534 | } |
| 1535 | |
| 1536 | static int ath6kl_htc_pipe_get_rxbuf_num(struct htc_target *target, |
| 1537 | enum htc_endpoint_id endpoint) |
| 1538 | { |
| 1539 | int num; |
| 1540 | |
| 1541 | spin_lock_bh(&target->rx_lock); |
| 1542 | num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq)); |
| 1543 | spin_unlock_bh(&target->rx_lock); |
| 1544 | |
| 1545 | return num; |
| 1546 | } |
| 1547 | |
| 1548 | static int ath6kl_htc_pipe_tx(struct htc_target *target, |
| 1549 | struct htc_packet *packet) |
| 1550 | { |
| 1551 | struct list_head queue; |
| 1552 | |
| 1553 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1554 | "%s: endPointId: %d, buffer: 0x%p, length: %d\n", |
| 1555 | __func__, packet->endpoint, packet->buf, |
| 1556 | packet->act_len); |
| 1557 | |
| 1558 | INIT_LIST_HEAD(&queue); |
| 1559 | list_add_tail(&packet->list, &queue); |
| 1560 | |
| 1561 | return htc_send_packets_multiple(target, &queue); |
| 1562 | } |
| 1563 | |
| 1564 | static int ath6kl_htc_pipe_wait_target(struct htc_target *target) |
| 1565 | { |
| 1566 | struct htc_ready_ext_msg *ready_msg; |
| 1567 | struct htc_service_connect_req connect; |
| 1568 | struct htc_service_connect_resp resp; |
| 1569 | int status = 0; |
| 1570 | |
| 1571 | status = htc_wait_recv_ctrl_message(target); |
| 1572 | |
| 1573 | if (status != 0) |
| 1574 | return status; |
| 1575 | |
| 1576 | if (target->pipe.ctrl_response_len < sizeof(*ready_msg)) { |
| 1577 | ath6kl_warn("invalid htc pipe ready msg len: %d\n", |
| 1578 | target->pipe.ctrl_response_len); |
| 1579 | return -ECOMM; |
| 1580 | } |
| 1581 | |
| 1582 | ready_msg = (struct htc_ready_ext_msg *) target->pipe.ctrl_response_buf; |
| 1583 | |
| 1584 | if (ready_msg->ver2_0_info.msg_id != cpu_to_le16(HTC_MSG_READY_ID)) { |
| 1585 | ath6kl_warn("invalid htc pipe ready msg: 0x%x\n", |
| 1586 | ready_msg->ver2_0_info.msg_id); |
| 1587 | return -ECOMM; |
| 1588 | } |
| 1589 | |
| 1590 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1591 | "Target Ready! : transmit resources : %d size:%d\n", |
| 1592 | ready_msg->ver2_0_info.cred_cnt, |
| 1593 | ready_msg->ver2_0_info.cred_sz); |
| 1594 | |
| 1595 | target->tgt_creds = le16_to_cpu(ready_msg->ver2_0_info.cred_cnt); |
| 1596 | target->tgt_cred_sz = le16_to_cpu(ready_msg->ver2_0_info.cred_sz); |
| 1597 | |
| 1598 | if ((target->tgt_creds == 0) || (target->tgt_cred_sz == 0)) |
| 1599 | return -ECOMM; |
| 1600 | |
| 1601 | htc_setup_target_buffer_assignments(target); |
| 1602 | |
| 1603 | /* setup our pseudo HTC control endpoint connection */ |
| 1604 | memset(&connect, 0, sizeof(connect)); |
| 1605 | memset(&resp, 0, sizeof(resp)); |
| 1606 | connect.ep_cb.tx_complete = htc_txctrl_complete; |
| 1607 | connect.ep_cb.rx = htc_rxctrl_complete; |
| 1608 | connect.max_txq_depth = NUM_CONTROL_TX_BUFFERS; |
| 1609 | connect.svc_id = HTC_CTRL_RSVD_SVC; |
| 1610 | |
| 1611 | /* connect fake service */ |
| 1612 | status = ath6kl_htc_pipe_conn_service(target, &connect, &resp); |
| 1613 | |
| 1614 | return status; |
| 1615 | } |
| 1616 | |
| 1617 | static void ath6kl_htc_pipe_flush_txep(struct htc_target *target, |
| 1618 | enum htc_endpoint_id endpoint, u16 tag) |
| 1619 | { |
| 1620 | struct htc_endpoint *ep = &target->endpoint[endpoint]; |
| 1621 | |
| 1622 | if (ep->svc_id == 0) { |
| 1623 | WARN_ON_ONCE(1); |
| 1624 | /* not in use.. */ |
| 1625 | return; |
| 1626 | } |
| 1627 | |
| 1628 | htc_flush_tx_endpoint(target, ep, tag); |
| 1629 | } |
| 1630 | |
| 1631 | static int ath6kl_htc_pipe_add_rxbuf_multiple(struct htc_target *target, |
| 1632 | struct list_head *pkt_queue) |
| 1633 | { |
| 1634 | struct htc_packet *packet, *tmp_pkt, *first; |
| 1635 | struct htc_endpoint *ep; |
| 1636 | int status = 0; |
| 1637 | |
| 1638 | if (list_empty(pkt_queue)) |
| 1639 | return -EINVAL; |
| 1640 | |
| 1641 | first = list_first_entry(pkt_queue, struct htc_packet, list); |
| 1642 | |
| 1643 | if (first->endpoint >= ENDPOINT_MAX) { |
| 1644 | WARN_ON_ONCE(1); |
| 1645 | return -EINVAL; |
| 1646 | } |
| 1647 | |
| 1648 | ath6kl_dbg(ATH6KL_DBG_HTC, "%s: epid: %d, cnt:%d, len: %d\n", |
| 1649 | __func__, first->endpoint, get_queue_depth(pkt_queue), |
| 1650 | first->buf_len); |
| 1651 | |
| 1652 | ep = &target->endpoint[first->endpoint]; |
| 1653 | |
| 1654 | spin_lock_bh(&target->rx_lock); |
| 1655 | |
| 1656 | /* store receive packets */ |
| 1657 | list_splice_tail_init(pkt_queue, &ep->rx_bufq); |
| 1658 | |
| 1659 | spin_unlock_bh(&target->rx_lock); |
| 1660 | |
| 1661 | if (status != 0) { |
| 1662 | /* walk through queue and mark each one canceled */ |
| 1663 | list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) { |
| 1664 | packet->status = -ECANCELED; |
| 1665 | } |
| 1666 | |
| 1667 | do_recv_completion(ep, pkt_queue); |
| 1668 | } |
| 1669 | |
| 1670 | return status; |
| 1671 | } |
| 1672 | |
| 1673 | static void ath6kl_htc_pipe_activity_changed(struct htc_target *target, |
| 1674 | enum htc_endpoint_id ep, |
| 1675 | bool active) |
| 1676 | { |
| 1677 | /* TODO */ |
| 1678 | } |
| 1679 | |
| 1680 | static void ath6kl_htc_pipe_flush_rx_buf(struct htc_target *target) |
| 1681 | { |
| 1682 | struct htc_endpoint *endpoint; |
| 1683 | struct htc_packet *packet, *tmp_pkt; |
| 1684 | int i; |
| 1685 | |
| 1686 | for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) { |
| 1687 | endpoint = &target->endpoint[i]; |
| 1688 | |
| 1689 | spin_lock_bh(&target->rx_lock); |
| 1690 | |
| 1691 | list_for_each_entry_safe(packet, tmp_pkt, |
| 1692 | &endpoint->rx_bufq, list) { |
| 1693 | list_del(&packet->list); |
| 1694 | spin_unlock_bh(&target->rx_lock); |
| 1695 | ath6kl_dbg(ATH6KL_DBG_HTC, |
| 1696 | "htc rx flush pkt 0x%p len %d ep %d\n", |
| 1697 | packet, packet->buf_len, |
| 1698 | packet->endpoint); |
| 1699 | dev_kfree_skb(packet->pkt_cntxt); |
| 1700 | spin_lock_bh(&target->rx_lock); |
| 1701 | } |
| 1702 | |
| 1703 | spin_unlock_bh(&target->rx_lock); |
| 1704 | } |
| 1705 | } |
| 1706 | |
| 1707 | static int ath6kl_htc_pipe_credit_setup(struct htc_target *target, |
| 1708 | struct ath6kl_htc_credit_info *info) |
| 1709 | { |
| 1710 | return 0; |
| 1711 | } |
| 1712 | |
| 1713 | static const struct ath6kl_htc_ops ath6kl_htc_pipe_ops = { |
| 1714 | .create = ath6kl_htc_pipe_create, |
| 1715 | .wait_target = ath6kl_htc_pipe_wait_target, |
| 1716 | .start = ath6kl_htc_pipe_start, |
| 1717 | .conn_service = ath6kl_htc_pipe_conn_service, |
| 1718 | .tx = ath6kl_htc_pipe_tx, |
| 1719 | .stop = ath6kl_htc_pipe_stop, |
| 1720 | .cleanup = ath6kl_htc_pipe_cleanup, |
| 1721 | .flush_txep = ath6kl_htc_pipe_flush_txep, |
| 1722 | .flush_rx_buf = ath6kl_htc_pipe_flush_rx_buf, |
| 1723 | .activity_changed = ath6kl_htc_pipe_activity_changed, |
| 1724 | .get_rxbuf_num = ath6kl_htc_pipe_get_rxbuf_num, |
| 1725 | .add_rxbuf_multiple = ath6kl_htc_pipe_add_rxbuf_multiple, |
| 1726 | .credit_setup = ath6kl_htc_pipe_credit_setup, |
| 1727 | .tx_complete = ath6kl_htc_pipe_tx_complete, |
| 1728 | .rx_complete = ath6kl_htc_pipe_rx_complete, |
| 1729 | }; |
| 1730 | |
| 1731 | void ath6kl_htc_pipe_attach(struct ath6kl *ar) |
| 1732 | { |
| 1733 | ar->htc_ops = &ath6kl_htc_pipe_ops; |
| 1734 | } |