drivers/net/wireless/ath/ath10k/htt_rx.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "core.h"
  19 #include "htc.h"
  20 #include "htt.h"
  21 #include "txrx.h"
  22 #include "debug.h"
  23 #include "trace.h"
  24 #include "mac.h"
  25
  26 #include <linux/log2.h>
  27
  28 #define HTT_RX_RING_SIZE HTT_RX_RING_SIZE_MAX
  29 #define HTT_RX_RING_FILL_LEVEL (((HTT_RX_RING_SIZE) / 2) - 1)
  30
  31 /* when under memory pressure rx ring refill may fail and needs a retry */
  32 #define HTT_RX_RING_REFILL_RETRY_MS 50
  33
  34 #define HTT_RX_RING_REFILL_RESCHED_MS 5
  35
  36 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb);
  37 static void ath10k_htt_txrx_compl_task(unsigned long ptr);
  38
  39 static struct sk_buff *
  40 ath10k_htt_rx_find_skb_paddr(struct ath10k *ar, u32 paddr)
  41 {
  42         struct ath10k_skb_rxcb *rxcb;
  43
  44         hash_for_each_possible(ar->htt.rx_ring.skb_table, rxcb, hlist, paddr)
  45                 if (rxcb->paddr == paddr)
  46                         return ATH10K_RXCB_SKB(rxcb);
  47
  48         WARN_ON_ONCE(1);
  49         return NULL;
  50 }
  51
  52 static void ath10k_htt_rx_ring_free(struct ath10k_htt *htt)
  53 {
  54         struct sk_buff *skb;
  55         struct ath10k_skb_rxcb *rxcb;
  56         struct hlist_node *n;
  57         int i;
  58
  59         if (htt->rx_ring.in_ord_rx) {
  60                 hash_for_each_safe(htt->rx_ring.skb_table, i, n, rxcb, hlist) {
  61                         skb = ATH10K_RXCB_SKB(rxcb);
  62                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  63                                          skb->len + skb_tailroom(skb),
  64                                          DMA_FROM_DEVICE);
  65                         hash_del(&rxcb->hlist);
  66                         dev_kfree_skb_any(skb);
  67                 }
  68         } else {
  69                 for (i = 0; i < htt->rx_ring.size; i++) {
  70                         skb = htt->rx_ring.netbufs_ring[i];
  71                         if (!skb)
  72                                 continue;
  73
  74                         rxcb = ATH10K_SKB_RXCB(skb);
  75                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  76                                          skb->len + skb_tailroom(skb),
  77                                          DMA_FROM_DEVICE);
  78                         dev_kfree_skb_any(skb);
  79                 }
  80         }
  81
  82         htt->rx_ring.fill_cnt = 0;
  83         hash_init(htt->rx_ring.skb_table);
  84         memset(htt->rx_ring.netbufs_ring, 0,
  85                htt->rx_ring.size * sizeof(htt->rx_ring.netbufs_ring[0]));
  86 }
  87
  88 static int __ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
  89 {
  90         struct htt_rx_desc *rx_desc;
  91         struct ath10k_skb_rxcb *rxcb;
  92         struct sk_buff *skb;
  93         dma_addr_t paddr;
  94         int ret = 0, idx;
  95
  96         /* The Full Rx Reorder firmware has no way of telling the host
  97          * implicitly when it copied HTT Rx Ring buffers to MAC Rx Ring.
  98          * To keep things simple make sure ring is always half empty. This
  99          * guarantees there'll be no replenishment overruns possible.
 100          */
 101         BUILD_BUG_ON(HTT_RX_RING_FILL_LEVEL >= HTT_RX_RING_SIZE / 2);
 102
 103         idx = __le32_to_cpu(*htt->rx_ring.alloc_idx.vaddr);
 104         while (num > 0) {
 105                 skb = dev_alloc_skb(HTT_RX_BUF_SIZE + HTT_RX_DESC_ALIGN);
 106                 if (!skb) {
 107                         ret = -ENOMEM;
 108                         goto fail;
 109                 }
 110
 111                 if (!IS_ALIGNED((unsigned long)skb->data, HTT_RX_DESC_ALIGN))
 112                         skb_pull(skb,
 113                                  PTR_ALIGN(skb->data, HTT_RX_DESC_ALIGN) -
 114                                  skb->data);
 115
 116                 /* Clear rx_desc attention word before posting to Rx ring */
 117                 rx_desc = (struct htt_rx_desc *)skb->data;
 118                 rx_desc->attention.flags = __cpu_to_le32(0);
 119
 120                 paddr = dma_map_single(htt->ar->dev, skb->data,
 121                                        skb->len + skb_tailroom(skb),
 122                                        DMA_FROM_DEVICE);
 123
 124                 if (unlikely(dma_mapping_error(htt->ar->dev, paddr))) {
 125                         dev_kfree_skb_any(skb);
 126                         ret = -ENOMEM;
 127                         goto fail;
 128                 }
 129
 130                 rxcb = ATH10K_SKB_RXCB(skb);
 131                 rxcb->paddr = paddr;
 132                 htt->rx_ring.netbufs_ring[idx] = skb;
 133                 htt->rx_ring.paddrs_ring[idx] = __cpu_to_le32(paddr);
 134                 htt->rx_ring.fill_cnt++;
 135
 136                 if (htt->rx_ring.in_ord_rx) {
 137                         hash_add(htt->rx_ring.skb_table,
 138                                  &ATH10K_SKB_RXCB(skb)->hlist,
 139                                  (u32)paddr);
 140                 }
 141
 142                 num--;
 143                 idx++;
 144                 idx &= htt->rx_ring.size_mask;
 145         }
 146
 147 fail:
 148         /*
 149          * Make sure the rx buffer is updated before available buffer
 150          * index to avoid any potential rx ring corruption.
 151          */
 152         mb();
 153         *htt->rx_ring.alloc_idx.vaddr = __cpu_to_le32(idx);
 154         return ret;
 155 }
 156
 157 static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
 158 {
 159         lockdep_assert_held(&htt->rx_ring.lock);
 160         return __ath10k_htt_rx_ring_fill_n(htt, num);
 161 }
 162
 163 static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
 164 {
 165         int ret, num_deficit, num_to_fill;
 166
 167         /* Refilling the whole RX ring buffer proves to be a bad idea. The
 168          * reason is RX may take up significant amount of CPU cycles and starve
 169          * other tasks, e.g. TX on an ethernet device while acting as a bridge
 170          * with ath10k wlan interface. This ended up with very poor performance
 171          * once CPU the host system was overwhelmed with RX on ath10k.
 172          *
 173          * By limiting the number of refills the replenishing occurs
 174          * progressively. This in turns makes use of the fact tasklets are
 175          * processed in FIFO order. This means actual RX processing can starve
 176          * out refilling. If there's not enough buffers on RX ring FW will not
 177          * report RX until it is refilled with enough buffers. This
 178          * automatically balances load wrt to CPU power.
 179          *
 180          * This probably comes at a cost of lower maximum throughput but
 181          * improves the average and stability. */
 182         spin_lock_bh(&htt->rx_ring.lock);
 183         num_deficit = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
 184         num_to_fill = min(ATH10K_HTT_MAX_NUM_REFILL, num_deficit);
 185         num_deficit -= num_to_fill;
 186         ret = ath10k_htt_rx_ring_fill_n(htt, num_to_fill);
 187         if (ret == -ENOMEM) {
 188                 /*
 189                  * Failed to fill it to the desired level -
 190                  * we'll start a timer and try again next time.
 191                  * As long as enough buffers are left in the ring for
 192                  * another A-MPDU rx, no special recovery is needed.
 193                  */
 194                 mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
 195                           msecs_to_jiffies(HTT_RX_RING_REFILL_RETRY_MS));
 196         } else if (num_deficit > 0) {
 197                 mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
 198                           msecs_to_jiffies(HTT_RX_RING_REFILL_RESCHED_MS));
 199         }
 200         spin_unlock_bh(&htt->rx_ring.lock);
 201 }
 202
 203 static void ath10k_htt_rx_ring_refill_retry(unsigned long arg)
 204 {
 205         struct ath10k_htt *htt = (struct ath10k_htt *)arg;
 206
 207         ath10k_htt_rx_msdu_buff_replenish(htt);
 208 }
 209
 210 int ath10k_htt_rx_ring_refill(struct ath10k *ar)
 211 {
 212         struct ath10k_htt *htt = &ar->htt;
 213         int ret;
 214
 215         spin_lock_bh(&htt->rx_ring.lock);
 216         ret = ath10k_htt_rx_ring_fill_n(htt, (htt->rx_ring.fill_level -
 217                                               htt->rx_ring.fill_cnt));
 218         spin_unlock_bh(&htt->rx_ring.lock);
 219
 220         if (ret)
 221                 ath10k_htt_rx_ring_free(htt);
 222
 223         return ret;
 224 }
 225
 226 void ath10k_htt_rx_free(struct ath10k_htt *htt)
 227 {
 228         del_timer_sync(&htt->rx_ring.refill_retry_timer);
 229         tasklet_kill(&htt->txrx_compl_task);
 230
 231         skb_queue_purge(&htt->rx_compl_q);
 232         skb_queue_purge(&htt->rx_in_ord_compl_q);
 233         skb_queue_purge(&htt->tx_fetch_ind_q);
 234
 235         ath10k_htt_rx_ring_free(htt);
 236
 237         dma_free_coherent(htt->ar->dev,
 238                           (htt->rx_ring.size *
 239                            sizeof(htt->rx_ring.paddrs_ring)),
 240                           htt->rx_ring.paddrs_ring,
 241                           htt->rx_ring.base_paddr);
 242
 243         dma_free_coherent(htt->ar->dev,
 244                           sizeof(*htt->rx_ring.alloc_idx.vaddr),
 245                           htt->rx_ring.alloc_idx.vaddr,
 246                           htt->rx_ring.alloc_idx.paddr);
 247
 248         kfree(htt->rx_ring.netbufs_ring);
 249 }
 250
 251 static inline struct sk_buff *ath10k_htt_rx_netbuf_pop(struct ath10k_htt *htt)
 252 {
 253         struct ath10k *ar = htt->ar;
 254         int idx;
 255         struct sk_buff *msdu;
 256
 257         lockdep_assert_held(&htt->rx_ring.lock);
 258
 259         if (htt->rx_ring.fill_cnt == 0) {
 260                 ath10k_warn(ar, "tried to pop sk_buff from an empty rx ring\n");
 261                 return NULL;
 262         }
 263
 264         idx = htt->rx_ring.sw_rd_idx.msdu_payld;
 265         msdu = htt->rx_ring.netbufs_ring[idx];
 266         htt->rx_ring.netbufs_ring[idx] = NULL;
 267         htt->rx_ring.paddrs_ring[idx] = 0;
 268
 269         idx++;
 270         idx &= htt->rx_ring.size_mask;
 271         htt->rx_ring.sw_rd_idx.msdu_payld = idx;
 272         htt->rx_ring.fill_cnt--;
 273
 274         dma_unmap_single(htt->ar->dev,
 275                          ATH10K_SKB_RXCB(msdu)->paddr,
 276                          msdu->len + skb_tailroom(msdu),
 277                          DMA_FROM_DEVICE);
 278         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
 279                         msdu->data, msdu->len + skb_tailroom(msdu));
 280
 281         return msdu;
 282 }
 283
 284 /* return: < 0 fatal error, 0 - non chained msdu, 1 chained msdu */
 285 static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
 286                                    struct sk_buff_head *amsdu)
 287 {
 288         struct ath10k *ar = htt->ar;
 289         int msdu_len, msdu_chaining = 0;
 290         struct sk_buff *msdu;
 291         struct htt_rx_desc *rx_desc;
 292
 293         lockdep_assert_held(&htt->rx_ring.lock);
 294
 295         for (;;) {
 296                 int last_msdu, msdu_len_invalid, msdu_chained;
 297
 298                 msdu = ath10k_htt_rx_netbuf_pop(htt);
 299                 if (!msdu) {
 300                         __skb_queue_purge(amsdu);
 301                         return -ENOENT;
 302                 }
 303
 304                 __skb_queue_tail(amsdu, msdu);
 305
 306                 rx_desc = (struct htt_rx_desc *)msdu->data;
 307
 308                 /* FIXME: we must report msdu payload since this is what caller
 309                  *        expects now */
 310                 skb_put(msdu, offsetof(struct htt_rx_desc, msdu_payload));
 311                 skb_pull(msdu, offsetof(struct htt_rx_desc, msdu_payload));
 312
 313                 /*
 314                  * Sanity check - confirm the HW is finished filling in the
 315                  * rx data.
 316                  * If the HW and SW are working correctly, then it's guaranteed
 317                  * that the HW's MAC DMA is done before this point in the SW.
 318                  * To prevent the case that we handle a stale Rx descriptor,
 319                  * just assert for now until we have a way to recover.
 320                  */
 321                 if (!(__le32_to_cpu(rx_desc->attention.flags)
 322                                 & RX_ATTENTION_FLAGS_MSDU_DONE)) {
 323                         __skb_queue_purge(amsdu);
 324                         return -EIO;
 325                 }
 326
 327                 msdu_len_invalid = !!(__le32_to_cpu(rx_desc->attention.flags)
 328                                         & (RX_ATTENTION_FLAGS_MPDU_LENGTH_ERR |
 329                                            RX_ATTENTION_FLAGS_MSDU_LENGTH_ERR));
 330                 msdu_len = MS(__le32_to_cpu(rx_desc->msdu_start.common.info0),
 331                               RX_MSDU_START_INFO0_MSDU_LENGTH);
 332                 msdu_chained = rx_desc->frag_info.ring2_more_count;
 333
 334                 if (msdu_len_invalid)
 335                         msdu_len = 0;
 336
 337                 skb_trim(msdu, 0);
 338                 skb_put(msdu, min(msdu_len, HTT_RX_MSDU_SIZE));
 339                 msdu_len -= msdu->len;
 340
 341                 /* Note: Chained buffers do not contain rx descriptor */
 342                 while (msdu_chained--) {
 343                         msdu = ath10k_htt_rx_netbuf_pop(htt);
 344                         if (!msdu) {
 345                                 __skb_queue_purge(amsdu);
 346                                 return -ENOENT;
 347                         }
 348
 349                         __skb_queue_tail(amsdu, msdu);
 350                         skb_trim(msdu, 0);
 351                         skb_put(msdu, min(msdu_len, HTT_RX_BUF_SIZE));
 352                         msdu_len -= msdu->len;
 353                         msdu_chaining = 1;
 354                 }
 355
 356                 last_msdu = __le32_to_cpu(rx_desc->msdu_end.common.info0) &
 357                                 RX_MSDU_END_INFO0_LAST_MSDU;
 358
 359                 trace_ath10k_htt_rx_desc(ar, &rx_desc->attention,
 360                                          sizeof(*rx_desc) - sizeof(u32));
 361
 362                 if (last_msdu)
 363                         break;
 364         }
 365
 366         if (skb_queue_empty(amsdu))
 367                 msdu_chaining = -1;
 368
 369         /*
 370          * Don't refill the ring yet.
 371          *
 372          * First, the elements popped here are still in use - it is not
 373          * safe to overwrite them until the matching call to
 374          * mpdu_desc_list_next. Second, for efficiency it is preferable to
 375          * refill the rx ring with 1 PPDU's worth of rx buffers (something
 376          * like 32 x 3 buffers), rather than one MPDU's worth of rx buffers
 377          * (something like 3 buffers). Consequently, we'll rely on the txrx
 378          * SW to tell us when it is done pulling all the PPDU's rx buffers
 379          * out of the rx ring, and then refill it just once.
 380          */
 381
 382         return msdu_chaining;
 383 }
 384
 385 static struct sk_buff *ath10k_htt_rx_pop_paddr(struct ath10k_htt *htt,
 386                                                u32 paddr)
 387 {
 388         struct ath10k *ar = htt->ar;
 389         struct ath10k_skb_rxcb *rxcb;
 390         struct sk_buff *msdu;
 391
 392         lockdep_assert_held(&htt->rx_ring.lock);
 393
 394         msdu = ath10k_htt_rx_find_skb_paddr(ar, paddr);
 395         if (!msdu)
 396                 return NULL;
 397
 398         rxcb = ATH10K_SKB_RXCB(msdu);
 399         hash_del(&rxcb->hlist);
 400         htt->rx_ring.fill_cnt--;
 401
 402         dma_unmap_single(htt->ar->dev, rxcb->paddr,
 403                          msdu->len + skb_tailroom(msdu),
 404                          DMA_FROM_DEVICE);
 405         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
 406                         msdu->data, msdu->len + skb_tailroom(msdu));
 407
 408         return msdu;
 409 }
 410
 411 static int ath10k_htt_rx_pop_paddr_list(struct ath10k_htt *htt,
 412                                         struct htt_rx_in_ord_ind *ev,
 413                                         struct sk_buff_head *list)
 414 {
 415         struct ath10k *ar = htt->ar;
 416         struct htt_rx_in_ord_msdu_desc *msdu_desc = ev->msdu_descs;
 417         struct htt_rx_desc *rxd;
 418         struct sk_buff *msdu;
 419         int msdu_count;
 420         bool is_offload;
 421         u32 paddr;
 422
 423         lockdep_assert_held(&htt->rx_ring.lock);
 424
 425         msdu_count = __le16_to_cpu(ev->msdu_count);
 426         is_offload = !!(ev->info & HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
 427
 428         while (msdu_count--) {
 429                 paddr = __le32_to_cpu(msdu_desc->msdu_paddr);
 430
 431                 msdu = ath10k_htt_rx_pop_paddr(htt, paddr);
 432                 if (!msdu) {
 433                         __skb_queue_purge(list);
 434                         return -ENOENT;
 435                 }
 436
 437                 __skb_queue_tail(list, msdu);
 438
 439                 if (!is_offload) {
 440                         rxd = (void *)msdu->data;
 441
 442                         trace_ath10k_htt_rx_desc(ar, rxd, sizeof(*rxd));
 443
 444                         skb_put(msdu, sizeof(*rxd));
 445                         skb_pull(msdu, sizeof(*rxd));
 446                         skb_put(msdu, __le16_to_cpu(msdu_desc->msdu_len));
 447
 448                         if (!(__le32_to_cpu(rxd->attention.flags) &
 449                               RX_ATTENTION_FLAGS_MSDU_DONE)) {
 450                                 ath10k_warn(htt->ar, "tried to pop an incomplete frame, oops!\n");
 451                                 return -EIO;
 452                         }
 453                 }
 454
 455                 msdu_desc++;
 456         }
 457
 458         return 0;
 459 }
 460
 461 int ath10k_htt_rx_alloc(struct ath10k_htt *htt)
 462 {
 463         struct ath10k *ar = htt->ar;
 464         dma_addr_t paddr;
 465         void *vaddr;
 466         size_t size;
 467         struct timer_list *timer = &htt->rx_ring.refill_retry_timer;
 468
 469         htt->rx_confused = false;
 470
 471         /* XXX: The fill level could be changed during runtime in response to
 472          * the host processing latency. Is this really worth it?
 473          */
 474         htt->rx_ring.size = HTT_RX_RING_SIZE;
 475         htt->rx_ring.size_mask = htt->rx_ring.size - 1;
 476         htt->rx_ring.fill_level = HTT_RX_RING_FILL_LEVEL;
 477
 478         if (!is_power_of_2(htt->rx_ring.size)) {
 479                 ath10k_warn(ar, "htt rx ring size is not power of 2\n");
 480                 return -EINVAL;
 481         }
 482
 483         htt->rx_ring.netbufs_ring =
 484                 kzalloc(htt->rx_ring.size * sizeof(struct sk_buff *),
 485                         GFP_KERNEL);
 486         if (!htt->rx_ring.netbufs_ring)
 487                 goto err_netbuf;
 488
 489         size = htt->rx_ring.size * sizeof(htt->rx_ring.paddrs_ring);
 490
 491         vaddr = dma_alloc_coherent(htt->ar->dev, size, &paddr, GFP_KERNEL);
 492         if (!vaddr)
 493                 goto err_dma_ring;
 494
 495         htt->rx_ring.paddrs_ring = vaddr;
 496         htt->rx_ring.base_paddr = paddr;
 497
 498         vaddr = dma_alloc_coherent(htt->ar->dev,
 499                                    sizeof(*htt->rx_ring.alloc_idx.vaddr),
 500                                    &paddr, GFP_KERNEL);
 501         if (!vaddr)
 502                 goto err_dma_idx;
 503
 504         htt->rx_ring.alloc_idx.vaddr = vaddr;
 505         htt->rx_ring.alloc_idx.paddr = paddr;
 506         htt->rx_ring.sw_rd_idx.msdu_payld = htt->rx_ring.size_mask;
 507         *htt->rx_ring.alloc_idx.vaddr = 0;
 508
 509         /* Initialize the Rx refill retry timer */
 510         setup_timer(timer, ath10k_htt_rx_ring_refill_retry, (unsigned long)htt);
 511
 512         spin_lock_init(&htt->rx_ring.lock);
 513
 514         htt->rx_ring.fill_cnt = 0;
 515         htt->rx_ring.sw_rd_idx.msdu_payld = 0;
 516         hash_init(htt->rx_ring.skb_table);
 517
 518         skb_queue_head_init(&htt->rx_compl_q);
 519         skb_queue_head_init(&htt->rx_in_ord_compl_q);
 520         skb_queue_head_init(&htt->tx_fetch_ind_q);
 521         atomic_set(&htt->num_mpdus_ready, 0);
 522
 523         tasklet_init(&htt->txrx_compl_task, ath10k_htt_txrx_compl_task,
 524                      (unsigned long)htt);
 525
 526         ath10k_dbg(ar, ATH10K_DBG_BOOT, "htt rx ring size %d fill_level %d\n",
 527                    htt->rx_ring.size, htt->rx_ring.fill_level);
 528         return 0;
 529
 530 err_dma_idx:
 531         dma_free_coherent(htt->ar->dev,
 532                           (htt->rx_ring.size *
 533                            sizeof(htt->rx_ring.paddrs_ring)),
 534                           htt->rx_ring.paddrs_ring,
 535                           htt->rx_ring.base_paddr);
 536 err_dma_ring:
 537         kfree(htt->rx_ring.netbufs_ring);
 538 err_netbuf:
 539         return -ENOMEM;
 540 }
 541
 542 static int ath10k_htt_rx_crypto_param_len(struct ath10k *ar,
 543                                           enum htt_rx_mpdu_encrypt_type type)
 544 {
 545         switch (type) {
 546         case HTT_RX_MPDU_ENCRYPT_NONE:
 547                 return 0;
 548         case HTT_RX_MPDU_ENCRYPT_WEP40:
 549         case HTT_RX_MPDU_ENCRYPT_WEP104:
 550                 return IEEE80211_WEP_IV_LEN;
 551         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 552         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 553                 return IEEE80211_TKIP_IV_LEN;
 554         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 555                 return IEEE80211_CCMP_HDR_LEN;
 556         case HTT_RX_MPDU_ENCRYPT_WEP128:
 557         case HTT_RX_MPDU_ENCRYPT_WAPI:
 558                 break;
 559         }
 560
 561         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 562         return 0;
 563 }
 564
 565 #define MICHAEL_MIC_LEN 8
 566
 567 static int ath10k_htt_rx_crypto_tail_len(struct ath10k *ar,
 568                                          enum htt_rx_mpdu_encrypt_type type)
 569 {
 570         switch (type) {
 571         case HTT_RX_MPDU_ENCRYPT_NONE:
 572                 return 0;
 573         case HTT_RX_MPDU_ENCRYPT_WEP40:
 574         case HTT_RX_MPDU_ENCRYPT_WEP104:
 575                 return IEEE80211_WEP_ICV_LEN;
 576         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 577         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 578                 return IEEE80211_TKIP_ICV_LEN;
 579         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 580                 return IEEE80211_CCMP_MIC_LEN;
 581         case HTT_RX_MPDU_ENCRYPT_WEP128:
 582         case HTT_RX_MPDU_ENCRYPT_WAPI:
 583                 break;
 584         }
 585
 586         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 587         return 0;
 588 }
 589
 590 struct amsdu_subframe_hdr {
 591         u8 dst[ETH_ALEN];
 592         u8 src[ETH_ALEN];
 593         __be16 len;
 594 } __packed;
 595
 596 #define GROUP_ID_IS_SU_MIMO(x) ((x) == 0 || (x) == 63)
 597
 598 static void ath10k_htt_rx_h_rates(struct ath10k *ar,
 599                                   struct ieee80211_rx_status *status,
 600                                   struct htt_rx_desc *rxd)
 601 {
 602         struct ieee80211_supported_band *sband;
 603         u8 cck, rate, bw, sgi, mcs, nss;
 604         u8 preamble = 0;
 605         u8 group_id;
 606         u32 info1, info2, info3;
 607
 608         info1 = __le32_to_cpu(rxd->ppdu_start.info1);
 609         info2 = __le32_to_cpu(rxd->ppdu_start.info2);
 610         info3 = __le32_to_cpu(rxd->ppdu_start.info3);
 611
 612         preamble = MS(info1, RX_PPDU_START_INFO1_PREAMBLE_TYPE);
 613
 614         switch (preamble) {
 615         case HTT_RX_LEGACY:
 616                 /* To get legacy rate index band is required. Since band can't
 617                  * be undefined check if freq is non-zero.
 618                  */
 619                 if (!status->freq)
 620                         return;
 621
 622                 cck = info1 & RX_PPDU_START_INFO1_L_SIG_RATE_SELECT;
 623                 rate = MS(info1, RX_PPDU_START_INFO1_L_SIG_RATE);
 624                 rate &= ~RX_PPDU_START_RATE_FLAG;
 625
 626                 sband = &ar->mac.sbands[status->band];
 627                 status->rate_idx = ath10k_mac_hw_rate_to_idx(sband, rate, cck);
 628                 break;
 629         case HTT_RX_HT:
 630         case HTT_RX_HT_WITH_TXBF:
 631                 /* HT-SIG - Table 20-11 in info2 and info3 */
 632                 mcs = info2 & 0x1F;
 633                 nss = mcs >> 3;
 634                 bw = (info2 >> 7) & 1;
 635                 sgi = (info3 >> 7) & 1;
 636
 637                 status->rate_idx = mcs;
 638                 status->flag |= RX_FLAG_HT;
 639                 if (sgi)
 640                         status->flag |= RX_FLAG_SHORT_GI;
 641                 if (bw)
 642                         status->flag |= RX_FLAG_40MHZ;
 643                 break;
 644         case HTT_RX_VHT:
 645         case HTT_RX_VHT_WITH_TXBF:
 646                 /* VHT-SIG-A1 in info2, VHT-SIG-A2 in info3
 647                    TODO check this */
 648                 bw = info2 & 3;
 649                 sgi = info3 & 1;
 650                 group_id = (info2 >> 4) & 0x3F;
 651
 652                 if (GROUP_ID_IS_SU_MIMO(group_id)) {
 653                         mcs = (info3 >> 4) & 0x0F;
 654                         nss = ((info2 >> 10) & 0x07) + 1;
 655                 } else {
 656                         /* Hardware doesn't decode VHT-SIG-B into Rx descriptor
 657                          * so it's impossible to decode MCS. Also since
 658                          * firmware consumes Group Id Management frames host
 659                          * has no knowledge regarding group/user position
 660                          * mapping so it's impossible to pick the correct Nsts
 661                          * from VHT-SIG-A1.
 662                          *
 663                          * Bandwidth and SGI are valid so report the rateinfo
 664                          * on best-effort basis.
 665                          */
 666                         mcs = 0;
 667                         nss = 1;
 668                 }
 669
 670                 if (mcs > 0x09) {
 671                         ath10k_warn(ar, "invalid MCS received %u\n", mcs);
 672                         ath10k_warn(ar, "rxd %08x mpdu start %08x %08x msdu start %08x %08x ppdu start %08x %08x %08x %08x %08x\n",
 673                                     __le32_to_cpu(rxd->attention.flags),
 674                                     __le32_to_cpu(rxd->mpdu_start.info0),
 675                                     __le32_to_cpu(rxd->mpdu_start.info1),
 676                                     __le32_to_cpu(rxd->msdu_start.common.info0),
 677                                     __le32_to_cpu(rxd->msdu_start.common.info1),
 678                                     rxd->ppdu_start.info0,
 679                                     __le32_to_cpu(rxd->ppdu_start.info1),
 680                                     __le32_to_cpu(rxd->ppdu_start.info2),
 681                                     __le32_to_cpu(rxd->ppdu_start.info3),
 682                                     __le32_to_cpu(rxd->ppdu_start.info4));
 683
 684                         ath10k_warn(ar, "msdu end %08x mpdu end %08x\n",
 685                                     __le32_to_cpu(rxd->msdu_end.common.info0),
 686                                     __le32_to_cpu(rxd->mpdu_end.info0));
 687
 688                         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL,
 689                                         "rx desc msdu payload: ",
 690                                         rxd->msdu_payload, 50);
 691                 }
 692
 693                 status->rate_idx = mcs;
 694                 status->vht_nss = nss;
 695
 696                 if (sgi)
 697                         status->flag |= RX_FLAG_SHORT_GI;
 698
 699                 switch (bw) {
 700                 /* 20MHZ */
 701                 case 0:
 702                         break;
 703                 /* 40MHZ */
 704                 case 1:
 705                         status->flag |= RX_FLAG_40MHZ;
 706                         break;
 707                 /* 80MHZ */
 708                 case 2:
 709                         status->vht_flag |= RX_VHT_FLAG_80MHZ;
 710                 }
 711
 712                 status->flag |= RX_FLAG_VHT;
 713                 break;
 714         default:
 715                 break;
 716         }
 717 }
 718
 719 static struct ieee80211_channel *
 720 ath10k_htt_rx_h_peer_channel(struct ath10k *ar, struct htt_rx_desc *rxd)
 721 {
 722         struct ath10k_peer *peer;
 723         struct ath10k_vif *arvif;
 724         struct cfg80211_chan_def def;
 725         u16 peer_id;
 726
 727         lockdep_assert_held(&ar->data_lock);
 728
 729         if (!rxd)
 730                 return NULL;
 731
 732         if (rxd->attention.flags &
 733             __cpu_to_le32(RX_ATTENTION_FLAGS_PEER_IDX_INVALID))
 734                 return NULL;
 735
 736         if (!(rxd->msdu_end.common.info0 &
 737               __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU)))
 738                 return NULL;
 739
 740         peer_id = MS(__le32_to_cpu(rxd->mpdu_start.info0),
 741                      RX_MPDU_START_INFO0_PEER_IDX);
 742
 743         peer = ath10k_peer_find_by_id(ar, peer_id);
 744         if (!peer)
 745                 return NULL;
 746
 747         arvif = ath10k_get_arvif(ar, peer->vdev_id);
 748         if (WARN_ON_ONCE(!arvif))
 749                 return NULL;
 750
 751         if (ath10k_mac_vif_chan(arvif->vif, &def))
 752                 return NULL;
 753
 754         return def.chan;
 755 }
 756
 757 static struct ieee80211_channel *
 758 ath10k_htt_rx_h_vdev_channel(struct ath10k *ar, u32 vdev_id)
 759 {
 760         struct ath10k_vif *arvif;
 761         struct cfg80211_chan_def def;
 762
 763         lockdep_assert_held(&ar->data_lock);
 764
 765         list_for_each_entry(arvif, &ar->arvifs, list) {
 766                 if (arvif->vdev_id == vdev_id &&
 767                     ath10k_mac_vif_chan(arvif->vif, &def) == 0)
 768                         return def.chan;
 769         }
 770
 771         return NULL;
 772 }
 773
 774 static void
 775 ath10k_htt_rx_h_any_chan_iter(struct ieee80211_hw *hw,
 776                               struct ieee80211_chanctx_conf *conf,
 777                               void *data)
 778 {
 779         struct cfg80211_chan_def *def = data;
 780
 781         *def = conf->def;
 782 }
 783
 784 static struct ieee80211_channel *
 785 ath10k_htt_rx_h_any_channel(struct ath10k *ar)
 786 {
 787         struct cfg80211_chan_def def = {};
 788
 789         ieee80211_iter_chan_contexts_atomic(ar->hw,
 790                                             ath10k_htt_rx_h_any_chan_iter,
 791                                             &def);
 792
 793         return def.chan;
 794 }
 795
 796 static bool ath10k_htt_rx_h_channel(struct ath10k *ar,
 797                                     struct ieee80211_rx_status *status,
 798                                     struct htt_rx_desc *rxd,
 799                                     u32 vdev_id)
 800 {
 801         struct ieee80211_channel *ch;
 802
 803         spin_lock_bh(&ar->data_lock);
 804         ch = ar->scan_channel;
 805         if (!ch)
 806                 ch = ar->rx_channel;
 807         if (!ch)
 808                 ch = ath10k_htt_rx_h_peer_channel(ar, rxd);
 809         if (!ch)
 810                 ch = ath10k_htt_rx_h_vdev_channel(ar, vdev_id);
 811         if (!ch)
 812                 ch = ath10k_htt_rx_h_any_channel(ar);
 813         if (!ch)
 814                 ch = ar->tgt_oper_chan;
 815         spin_unlock_bh(&ar->data_lock);
 816
 817         if (!ch)
 818                 return false;
 819
 820         status->band = ch->band;
 821         status->freq = ch->center_freq;
 822
 823         return true;
 824 }
 825
 826 static void ath10k_htt_rx_h_signal(struct ath10k *ar,
 827                                    struct ieee80211_rx_status *status,
 828                                    struct htt_rx_desc *rxd)
 829 {
 830         /* FIXME: Get real NF */
 831         status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
 832                          rxd->ppdu_start.rssi_comb;
 833         status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
 834 }
 835
 836 static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
 837                                     struct ieee80211_rx_status *status,
 838                                     struct htt_rx_desc *rxd)
 839 {
 840         /* FIXME: TSF is known only at the end of PPDU, in the last MPDU. This
 841          * means all prior MSDUs in a PPDU are reported to mac80211 without the
 842          * TSF. Is it worth holding frames until end of PPDU is known?
 843          *
 844          * FIXME: Can we get/compute 64bit TSF?
 845          */
 846         status->mactime = __le32_to_cpu(rxd->ppdu_end.common.tsf_timestamp);
 847         status->flag |= RX_FLAG_MACTIME_END;
 848 }
 849
 850 static void ath10k_htt_rx_h_ppdu(struct ath10k *ar,
 851                                  struct sk_buff_head *amsdu,
 852                                  struct ieee80211_rx_status *status,
 853                                  u32 vdev_id)
 854 {
 855         struct sk_buff *first;
 856         struct htt_rx_desc *rxd;
 857         bool is_first_ppdu;
 858         bool is_last_ppdu;
 859
 860         if (skb_queue_empty(amsdu))
 861                 return;
 862
 863         first = skb_peek(amsdu);
 864         rxd = (void *)first->data - sizeof(*rxd);
 865
 866         is_first_ppdu = !!(rxd->attention.flags &
 867                            __cpu_to_le32(RX_ATTENTION_FLAGS_FIRST_MPDU));
 868         is_last_ppdu = !!(rxd->attention.flags &
 869                           __cpu_to_le32(RX_ATTENTION_FLAGS_LAST_MPDU));
 870
 871         if (is_first_ppdu) {
 872                 /* New PPDU starts so clear out the old per-PPDU status. */
 873                 status->freq = 0;
 874                 status->rate_idx = 0;
 875                 status->vht_nss = 0;
 876                 status->vht_flag &= ~RX_VHT_FLAG_80MHZ;
 877                 status->flag &= ~(RX_FLAG_HT |
 878                                   RX_FLAG_VHT |
 879                                   RX_FLAG_SHORT_GI |
 880                                   RX_FLAG_40MHZ |
 881                                   RX_FLAG_MACTIME_END);
 882                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 883
 884                 ath10k_htt_rx_h_signal(ar, status, rxd);
 885                 ath10k_htt_rx_h_channel(ar, status, rxd, vdev_id);
 886                 ath10k_htt_rx_h_rates(ar, status, rxd);
 887         }
 888
 889         if (is_last_ppdu)
 890                 ath10k_htt_rx_h_mactime(ar, status, rxd);
 891 }
 892
 893 static const char * const tid_to_ac[] = {
 894         "BE",
 895         "BK",
 896         "BK",
 897         "BE",
 898         "VI",
 899         "VI",
 900         "VO",
 901         "VO",
 902 };
 903
 904 static char *ath10k_get_tid(struct ieee80211_hdr *hdr, char *out, size_t size)
 905 {
 906         u8 *qc;
 907         int tid;
 908
 909         if (!ieee80211_is_data_qos(hdr->frame_control))
 910                 return "";
 911
 912         qc = ieee80211_get_qos_ctl(hdr);
 913         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 914         if (tid < 8)
 915                 snprintf(out, size, "tid %d (%s)", tid, tid_to_ac[tid]);
 916         else
 917                 snprintf(out, size, "tid %d", tid);
 918
 919         return out;
 920 }
 921
 922 static void ath10k_process_rx(struct ath10k *ar,
 923                               struct ieee80211_rx_status *rx_status,
 924                               struct sk_buff *skb)
 925 {
 926         struct ieee80211_rx_status *status;
 927         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 928         char tid[32];
 929
 930         status = IEEE80211_SKB_RXCB(skb);
 931         *status = *rx_status;
 932
 933         ath10k_dbg(ar, ATH10K_DBG_DATA,
 934                    "rx skb %p len %u peer %pM %s %s sn %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u flag 0x%llx fcs-err %i mic-err %i amsdu-more %i\n",
 935                    skb,
 936                    skb->len,
 937                    ieee80211_get_SA(hdr),
 938                    ath10k_get_tid(hdr, tid, sizeof(tid)),
 939                    is_multicast_ether_addr(ieee80211_get_DA(hdr)) ?
 940                                                         "mcast" : "ucast",
 941                    (__le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4,
 942                    (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) == 0 ?
 943                                                         "legacy" : "",
 944                    status->flag & RX_FLAG_HT ? "ht" : "",
 945                    status->flag & RX_FLAG_VHT ? "vht" : "",
 946                    status->flag & RX_FLAG_40MHZ ? "40" : "",
 947                    status->vht_flag & RX_VHT_FLAG_80MHZ ? "80" : "",
 948                    status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
 949                    status->rate_idx,
 950                    status->vht_nss,
 951                    status->freq,
 952                    status->band, status->flag,
 953                    !!(status->flag & RX_FLAG_FAILED_FCS_CRC),
 954                    !!(status->flag & RX_FLAG_MMIC_ERROR),
 955                    !!(status->flag & RX_FLAG_AMSDU_MORE));
 956         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
 957                         skb->data, skb->len);
 958         trace_ath10k_rx_hdr(ar, skb->data, skb->len);
 959         trace_ath10k_rx_payload(ar, skb->data, skb->len);
 960
 961         ieee80211_rx(ar->hw, skb);
 962 }
 963
 964 static int ath10k_htt_rx_nwifi_hdrlen(struct ath10k *ar,
 965                                       struct ieee80211_hdr *hdr)
 966 {
 967         int len = ieee80211_hdrlen(hdr->frame_control);
 968
 969         if (!test_bit(ATH10K_FW_FEATURE_NO_NWIFI_DECAP_4ADDR_PADDING,
 970                       ar->running_fw->fw_file.fw_features))
 971                 len = round_up(len, 4);
 972
 973         return len;
 974 }
 975
 976 static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
 977                                         struct sk_buff *msdu,
 978                                         struct ieee80211_rx_status *status,
 979                                         enum htt_rx_mpdu_encrypt_type enctype,
 980                                         bool is_decrypted)
 981 {
 982         struct ieee80211_hdr *hdr;
 983         struct htt_rx_desc *rxd;
 984         size_t hdr_len;
 985         size_t crypto_len;
 986         bool is_first;
 987         bool is_last;
 988
 989         rxd = (void *)msdu->data - sizeof(*rxd);
 990         is_first = !!(rxd->msdu_end.common.info0 &
 991                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
 992         is_last = !!(rxd->msdu_end.common.info0 &
 993                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
 994
 995         /* Delivered decapped frame:
 996          * [802.11 header]
 997          * [crypto param] <-- can be trimmed if !fcs_err &&
 998          *                    !decrypt_err && !peer_idx_invalid
 999          * [amsdu header] <-- only if A-MSDU
1000          * [rfc1042/llc]
1001          * [payload]
1002          * [FCS] <-- at end, needs to be trimmed
1003          */
1004
1005         /* This probably shouldn't happen but warn just in case */
1006         if (unlikely(WARN_ON_ONCE(!is_first)))
1007                 return;
1008
1009         /* This probably shouldn't happen but warn just in case */
1010         if (unlikely(WARN_ON_ONCE(!(is_first && is_last))))
1011                 return;
1012
1013         skb_trim(msdu, msdu->len - FCS_LEN);
1014
1015         /* In most cases this will be true for sniffed frames. It makes sense
1016          * to deliver them as-is without stripping the crypto param. This is
1017          * necessary for software based decryption.
1018          *
1019          * If there's no error then the frame is decrypted. At least that is
1020          * the case for frames that come in via fragmented rx indication.
1021          */
1022         if (!is_decrypted)
1023                 return;
1024
1025         /* The payload is decrypted so strip crypto params. Start from tail
1026          * since hdr is used to compute some stuff.
1027          */
1028
1029         hdr = (void *)msdu->data;
1030
1031         /* Tail */
1032         if (status->flag & RX_FLAG_IV_STRIPPED)
1033                 skb_trim(msdu, msdu->len -
1034                          ath10k_htt_rx_crypto_tail_len(ar, enctype));
1035
1036         /* MMIC */
1037         if ((status->flag & RX_FLAG_MMIC_STRIPPED) &&
1038             !ieee80211_has_morefrags(hdr->frame_control) &&
1039             enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
1040                 skb_trim(msdu, msdu->len - 8);
1041
1042         /* Head */
1043         if (status->flag & RX_FLAG_IV_STRIPPED) {
1044                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1045                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1046
1047                 memmove((void *)msdu->data + crypto_len,
1048                         (void *)msdu->data, hdr_len);
1049                 skb_pull(msdu, crypto_len);
1050         }
1051 }
1052
1053 static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
1054                                           struct sk_buff *msdu,
1055                                           struct ieee80211_rx_status *status,
1056                                           const u8 first_hdr[64])
1057 {
1058         struct ieee80211_hdr *hdr;
1059         size_t hdr_len;
1060         u8 da[ETH_ALEN];
1061         u8 sa[ETH_ALEN];
1062
1063         /* Delivered decapped frame:
1064          * [nwifi 802.11 header] <-- replaced with 802.11 hdr
1065          * [rfc1042/llc]
1066          *
1067          * Note: The nwifi header doesn't have QoS Control and is
1068          * (always?) a 3addr frame.
1069          *
1070          * Note2: There's no A-MSDU subframe header. Even if it's part
1071          * of an A-MSDU.
1072          */
1073
1074         /* pull decapped header and copy SA & DA */
1075         if ((ar->hw_params.hw_4addr_pad == ATH10K_HW_4ADDR_PAD_BEFORE) &&
1076             ieee80211_has_a4(((struct ieee80211_hdr *)first_hdr)->frame_control)) {
1077                 /* The QCA99X0 4 address mode pad 2 bytes at the
1078                  * beginning of MSDU
1079                  */
1080                 hdr = (struct ieee80211_hdr *)(msdu->data + 2);
1081                 /* The skb length need be extended 2 as the 2 bytes at the tail
1082                  * be excluded due to the padding
1083                  */
1084                 skb_put(msdu, 2);
1085         } else {
1086                 hdr = (struct ieee80211_hdr *)(msdu->data);
1087         }
1088
1089         hdr_len = ath10k_htt_rx_nwifi_hdrlen(ar, hdr);
1090         ether_addr_copy(da, ieee80211_get_DA(hdr));
1091         ether_addr_copy(sa, ieee80211_get_SA(hdr));
1092         skb_pull(msdu, hdr_len);
1093
1094         /* push original 802.11 header */
1095         hdr = (struct ieee80211_hdr *)first_hdr;
1096         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1097         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1098
1099         /* original 802.11 header has a different DA and in
1100          * case of 4addr it may also have different SA
1101          */
1102         hdr = (struct ieee80211_hdr *)msdu->data;
1103         ether_addr_copy(ieee80211_get_DA(hdr), da);
1104         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1105 }
1106
1107 static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar,
1108                                           struct sk_buff *msdu,
1109                                           enum htt_rx_mpdu_encrypt_type enctype)
1110 {
1111         struct ieee80211_hdr *hdr;
1112         struct htt_rx_desc *rxd;
1113         size_t hdr_len, crypto_len;
1114         void *rfc1042;
1115         bool is_first, is_last, is_amsdu;
1116
1117         rxd = (void *)msdu->data - sizeof(*rxd);
1118         hdr = (void *)rxd->rx_hdr_status;
1119
1120         is_first = !!(rxd->msdu_end.common.info0 &
1121                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1122         is_last = !!(rxd->msdu_end.common.info0 &
1123                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
1124         is_amsdu = !(is_first && is_last);
1125
1126         rfc1042 = hdr;
1127
1128         if (is_first) {
1129                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1130                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1131
1132                 rfc1042 += round_up(hdr_len, 4) +
1133                            round_up(crypto_len, 4);
1134         }
1135
1136         if (is_amsdu)
1137                 rfc1042 += sizeof(struct amsdu_subframe_hdr);
1138
1139         return rfc1042;
1140 }
1141
1142 static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
1143                                         struct sk_buff *msdu,
1144                                         struct ieee80211_rx_status *status,
1145                                         const u8 first_hdr[64],
1146                                         enum htt_rx_mpdu_encrypt_type enctype)
1147 {
1148         struct ieee80211_hdr *hdr;
1149         struct ethhdr *eth;
1150         size_t hdr_len;
1151         void *rfc1042;
1152         u8 da[ETH_ALEN];
1153         u8 sa[ETH_ALEN];
1154
1155         /* Delivered decapped frame:
1156          * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
1157          * [payload]
1158          */
1159
1160         rfc1042 = ath10k_htt_rx_h_find_rfc1042(ar, msdu, enctype);
1161         if (WARN_ON_ONCE(!rfc1042))
1162                 return;
1163
1164         /* pull decapped header and copy SA & DA */
1165         eth = (struct ethhdr *)msdu->data;
1166         ether_addr_copy(da, eth->h_dest);
1167         ether_addr_copy(sa, eth->h_source);
1168         skb_pull(msdu, sizeof(struct ethhdr));
1169
1170         /* push rfc1042/llc/snap */
1171         memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042,
1172                sizeof(struct rfc1042_hdr));
1173
1174         /* push original 802.11 header */
1175         hdr = (struct ieee80211_hdr *)first_hdr;
1176         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1177         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1178
1179         /* original 802.11 header has a different DA and in
1180          * case of 4addr it may also have different SA
1181          */
1182         hdr = (struct ieee80211_hdr *)msdu->data;
1183         ether_addr_copy(ieee80211_get_DA(hdr), da);
1184         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1185 }
1186
1187 static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
1188                                          struct sk_buff *msdu,
1189                                          struct ieee80211_rx_status *status,
1190                                          const u8 first_hdr[64])
1191 {
1192         struct ieee80211_hdr *hdr;
1193         size_t hdr_len;
1194
1195         /* Delivered decapped frame:
1196          * [amsdu header] <-- replaced with 802.11 hdr
1197          * [rfc1042/llc]
1198          * [payload]
1199          */
1200
1201         skb_pull(msdu, sizeof(struct amsdu_subframe_hdr));
1202
1203         hdr = (struct ieee80211_hdr *)first_hdr;
1204         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1205         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1206 }
1207
1208 static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
1209                                     struct sk_buff *msdu,
1210                                     struct ieee80211_rx_status *status,
1211                                     u8 first_hdr[64],
1212                                     enum htt_rx_mpdu_encrypt_type enctype,
1213                                     bool is_decrypted)
1214 {
1215         struct htt_rx_desc *rxd;
1216         enum rx_msdu_decap_format decap;
1217
1218         /* First msdu's decapped header:
1219          * [802.11 header] <-- padded to 4 bytes long
1220          * [crypto param] <-- padded to 4 bytes long
1221          * [amsdu header] <-- only if A-MSDU
1222          * [rfc1042/llc]
1223          *
1224          * Other (2nd, 3rd, ..) msdu's decapped header:
1225          * [amsdu header] <-- only if A-MSDU
1226          * [rfc1042/llc]
1227          */
1228
1229         rxd = (void *)msdu->data - sizeof(*rxd);
1230         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1231                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1232
1233         switch (decap) {
1234         case RX_MSDU_DECAP_RAW:
1235                 ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype,
1236                                             is_decrypted);
1237                 break;
1238         case RX_MSDU_DECAP_NATIVE_WIFI:
1239                 ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
1240                 break;
1241         case RX_MSDU_DECAP_ETHERNET2_DIX:
1242                 ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
1243                 break;
1244         case RX_MSDU_DECAP_8023_SNAP_LLC:
1245                 ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
1246                 break;
1247         }
1248 }
1249
1250 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
1251 {
1252         struct htt_rx_desc *rxd;
1253         u32 flags, info;
1254         bool is_ip4, is_ip6;
1255         bool is_tcp, is_udp;
1256         bool ip_csum_ok, tcpudp_csum_ok;
1257
1258         rxd = (void *)skb->data - sizeof(*rxd);
1259         flags = __le32_to_cpu(rxd->attention.flags);
1260         info = __le32_to_cpu(rxd->msdu_start.common.info1);
1261
1262         is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
1263         is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
1264         is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
1265         is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
1266         ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
1267         tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);
1268
1269         if (!is_ip4 && !is_ip6)
1270                 return CHECKSUM_NONE;
1271         if (!is_tcp && !is_udp)
1272                 return CHECKSUM_NONE;
1273         if (!ip_csum_ok)
1274                 return CHECKSUM_NONE;
1275         if (!tcpudp_csum_ok)
1276                 return CHECKSUM_NONE;
1277
1278         return CHECKSUM_UNNECESSARY;
1279 }
1280
1281 static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
1282 {
1283         msdu->ip_summed = ath10k_htt_rx_get_csum_state(msdu);
1284 }
1285
1286 static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
1287                                  struct sk_buff_head *amsdu,
1288                                  struct ieee80211_rx_status *status)
1289 {
1290         struct sk_buff *first;
1291         struct sk_buff *last;
1292         struct sk_buff *msdu;
1293         struct htt_rx_desc *rxd;
1294         struct ieee80211_hdr *hdr;
1295         enum htt_rx_mpdu_encrypt_type enctype;
1296         u8 first_hdr[64];
1297         u8 *qos;
1298         size_t hdr_len;
1299         bool has_fcs_err;
1300         bool has_crypto_err;
1301         bool has_tkip_err;
1302         bool has_peer_idx_invalid;
1303         bool is_decrypted;
1304         bool is_mgmt;
1305         u32 attention;
1306
1307         if (skb_queue_empty(amsdu))
1308                 return;
1309
1310         first = skb_peek(amsdu);
1311         rxd = (void *)first->data - sizeof(*rxd);
1312
1313         is_mgmt = !!(rxd->attention.flags &
1314                      __cpu_to_le32(RX_ATTENTION_FLAGS_MGMT_TYPE));
1315
1316         enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
1317                      RX_MPDU_START_INFO0_ENCRYPT_TYPE);
1318
1319         /* First MSDU's Rx descriptor in an A-MSDU contains full 802.11
1320          * decapped header. It'll be used for undecapping of each MSDU.
1321          */
1322         hdr = (void *)rxd->rx_hdr_status;
1323         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1324         memcpy(first_hdr, hdr, hdr_len);
1325
1326         /* Each A-MSDU subframe will use the original header as the base and be
1327          * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
1328          */
1329         hdr = (void *)first_hdr;
1330         qos = ieee80211_get_qos_ctl(hdr);
1331         qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
1332
1333         /* Some attention flags are valid only in the last MSDU. */
1334         last = skb_peek_tail(amsdu);
1335         rxd = (void *)last->data - sizeof(*rxd);
1336         attention = __le32_to_cpu(rxd->attention.flags);
1337
1338         has_fcs_err = !!(attention & RX_ATTENTION_FLAGS_FCS_ERR);
1339         has_crypto_err = !!(attention & RX_ATTENTION_FLAGS_DECRYPT_ERR);
1340         has_tkip_err = !!(attention & RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
1341         has_peer_idx_invalid = !!(attention & RX_ATTENTION_FLAGS_PEER_IDX_INVALID);
1342
1343         /* Note: If hardware captures an encrypted frame that it can't decrypt,
1344          * e.g. due to fcs error, missing peer or invalid key data it will
1345          * report the frame as raw.
1346          */
1347         is_decrypted = (enctype != HTT_RX_MPDU_ENCRYPT_NONE &&
1348                         !has_fcs_err &&
1349                         !has_crypto_err &&
1350                         !has_peer_idx_invalid);
1351
1352         /* Clear per-MPDU flags while leaving per-PPDU flags intact. */
1353         status->flag &= ~(RX_FLAG_FAILED_FCS_CRC |
1354                           RX_FLAG_MMIC_ERROR |
1355                           RX_FLAG_DECRYPTED |
1356                           RX_FLAG_IV_STRIPPED |
1357                           RX_FLAG_ONLY_MONITOR |
1358                           RX_FLAG_MMIC_STRIPPED);
1359
1360         if (has_fcs_err)
1361                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
1362
1363         if (has_tkip_err)
1364                 status->flag |= RX_FLAG_MMIC_ERROR;
1365
1366         /* Firmware reports all necessary management frames via WMI already.
1367          * They are not reported to monitor interfaces at all so pass the ones
1368          * coming via HTT to monitor interfaces instead. This simplifies
1369          * matters a lot.
1370          */
1371         if (is_mgmt)
1372                 status->flag |= RX_FLAG_ONLY_MONITOR;
1373
1374         if (is_decrypted) {
1375                 status->flag |= RX_FLAG_DECRYPTED;
1376
1377                 if (likely(!is_mgmt))
1378                         status->flag |= RX_FLAG_IV_STRIPPED |
1379                                         RX_FLAG_MMIC_STRIPPED;
1380 }
1381
1382         skb_queue_walk(amsdu, msdu) {
1383                 ath10k_htt_rx_h_csum_offload(msdu);
1384                 ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
1385                                         is_decrypted);
1386
1387                 /* Undecapping involves copying the original 802.11 header back
1388                  * to sk_buff. If frame is protected and hardware has decrypted
1389                  * it then remove the protected bit.
1390                  */
1391                 if (!is_decrypted)
1392                         continue;
1393                 if (is_mgmt)
1394                         continue;
1395
1396                 hdr = (void *)msdu->data;
1397                 hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1398         }
1399 }
1400
1401 static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
1402                                     struct sk_buff_head *amsdu,
1403                                     struct ieee80211_rx_status *status)
1404 {
1405         struct sk_buff *msdu;
1406
1407         while ((msdu = __skb_dequeue(amsdu))) {
1408                 /* Setup per-MSDU flags */
1409                 if (skb_queue_empty(amsdu))
1410                         status->flag &= ~RX_FLAG_AMSDU_MORE;
1411                 else
1412                         status->flag |= RX_FLAG_AMSDU_MORE;
1413
1414                 ath10k_process_rx(ar, status, msdu);
1415         }
1416 }
1417
1418 static int ath10k_unchain_msdu(struct sk_buff_head *amsdu)
1419 {
1420         struct sk_buff *skb, *first;
1421         int space;
1422         int total_len = 0;
1423
1424         /* TODO:  Might could optimize this by using
1425          * skb_try_coalesce or similar method to
1426          * decrease copying, or maybe get mac80211 to
1427          * provide a way to just receive a list of
1428          * skb?
1429          */
1430
1431         first = __skb_dequeue(amsdu);
1432
1433         /* Allocate total length all at once. */
1434         skb_queue_walk(amsdu, skb)
1435                 total_len += skb->len;
1436
1437         space = total_len - skb_tailroom(first);
1438         if ((space > 0) &&
1439             (pskb_expand_head(first, 0, space, GFP_ATOMIC) < 0)) {
1440                 /* TODO:  bump some rx-oom error stat */
1441                 /* put it back together so we can free the
1442                  * whole list at once.
1443                  */
1444                 __skb_queue_head(amsdu, first);
1445                 return -1;
1446         }
1447
1448         /* Walk list again, copying contents into
1449          * msdu_head
1450          */
1451         while ((skb = __skb_dequeue(amsdu))) {
1452                 skb_copy_from_linear_data(skb, skb_put(first, skb->len),
1453                                           skb->len);
1454                 dev_kfree_skb_any(skb);
1455         }
1456
1457         __skb_queue_head(amsdu, first);
1458         return 0;
1459 }
1460
1461 static void ath10k_htt_rx_h_unchain(struct ath10k *ar,
1462                                     struct sk_buff_head *amsdu,
1463                                     bool chained)
1464 {
1465         struct sk_buff *first;
1466         struct htt_rx_desc *rxd;
1467         enum rx_msdu_decap_format decap;
1468
1469         first = skb_peek(amsdu);
1470         rxd = (void *)first->data - sizeof(*rxd);
1471         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1472                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1473
1474         if (!chained)
1475                 return;
1476
1477         /* FIXME: Current unchaining logic can only handle simple case of raw
1478          * msdu chaining. If decapping is other than raw the chaining may be
1479          * more complex and this isn't handled by the current code. Don't even
1480          * try re-constructing such frames - it'll be pretty much garbage.
1481          */
1482         if (decap != RX_MSDU_DECAP_RAW ||
1483             skb_queue_len(amsdu) != 1 + rxd->frag_info.ring2_more_count) {
1484                 __skb_queue_purge(amsdu);
1485                 return;
1486         }
1487
1488         ath10k_unchain_msdu(amsdu);
1489 }
1490
1491 static bool ath10k_htt_rx_amsdu_allowed(struct ath10k *ar,
1492                                         struct sk_buff_head *amsdu,
1493                                         struct ieee80211_rx_status *rx_status)
1494 {
1495         /* FIXME: It might be a good idea to do some fuzzy-testing to drop
1496          * invalid/dangerous frames.
1497          */
1498
1499         if (!rx_status->freq) {
1500                 ath10k_warn(ar, "no channel configured; ignoring frame(s)!\n");
1501                 return false;
1502         }
1503
1504         if (test_bit(ATH10K_CAC_RUNNING, &ar->dev_flags)) {
1505                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx cac running\n");
1506                 return false;
1507         }
1508
1509         return true;
1510 }
1511
1512 static void ath10k_htt_rx_h_filter(struct ath10k *ar,
1513                                    struct sk_buff_head *amsdu,
1514                                    struct ieee80211_rx_status *rx_status)
1515 {
1516         if (skb_queue_empty(amsdu))
1517                 return;
1518
1519         if (ath10k_htt_rx_amsdu_allowed(ar, amsdu, rx_status))
1520                 return;
1521
1522         __skb_queue_purge(amsdu);
1523 }
1524
1525 static int ath10k_htt_rx_handle_amsdu(struct ath10k_htt *htt)
1526 {
1527         struct ath10k *ar = htt->ar;
1528         static struct ieee80211_rx_status rx_status;
1529         struct sk_buff_head amsdu;
1530         int ret;
1531
1532         __skb_queue_head_init(&amsdu);
1533
1534         spin_lock_bh(&htt->rx_ring.lock);
1535         if (htt->rx_confused) {
1536                 spin_unlock_bh(&htt->rx_ring.lock);
1537                 return -EIO;
1538         }
1539         ret = ath10k_htt_rx_amsdu_pop(htt, &amsdu);
1540         spin_unlock_bh(&htt->rx_ring.lock);
1541
1542         if (ret < 0) {
1543                 ath10k_warn(ar, "rx ring became corrupted: %d\n", ret);
1544                 __skb_queue_purge(&amsdu);
1545                 /* FIXME: It's probably a good idea to reboot the
1546                  * device instead of leaving it inoperable.
1547                  */
1548                 htt->rx_confused = true;
1549                 return ret;
1550         }
1551
1552         ath10k_htt_rx_h_ppdu(ar, &amsdu, &rx_status, 0xffff);
1553         ath10k_htt_rx_h_unchain(ar, &amsdu, ret > 0);
1554         ath10k_htt_rx_h_filter(ar, &amsdu, &rx_status);
1555         ath10k_htt_rx_h_mpdu(ar, &amsdu, &rx_status);
1556         ath10k_htt_rx_h_deliver(ar, &amsdu, &rx_status);
1557
1558         return 0;
1559 }
1560
1561 static void ath10k_htt_rx_proc_rx_ind(struct ath10k_htt *htt,
1562                                       struct htt_rx_indication *rx)
1563 {
1564         struct ath10k *ar = htt->ar;
1565         struct htt_rx_indication_mpdu_range *mpdu_ranges;
1566         int num_mpdu_ranges;
1567         int i, mpdu_count = 0;
1568
1569         num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
1570                              HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
1571         mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
1572
1573         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
1574                         rx, sizeof(*rx) +
1575                         (sizeof(struct htt_rx_indication_mpdu_range) *
1576                                 num_mpdu_ranges));
1577
1578         for (i = 0; i < num_mpdu_ranges; i++)
1579                 mpdu_count += mpdu_ranges[i].mpdu_count;
1580
1581         atomic_add(mpdu_count, &htt->num_mpdus_ready);
1582
1583         tasklet_schedule(&htt->txrx_compl_task);
1584 }
1585
1586 static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt)
1587 {
1588         atomic_inc(&htt->num_mpdus_ready);
1589
1590         tasklet_schedule(&htt->txrx_compl_task);
1591 }
1592
1593 static void ath10k_htt_rx_tx_compl_ind(struct ath10k *ar,
1594                                        struct sk_buff *skb)
1595 {
1596         struct ath10k_htt *htt = &ar->htt;
1597         struct htt_resp *resp = (struct htt_resp *)skb->data;
1598         struct htt_tx_done tx_done = {};
1599         int status = MS(resp->data_tx_completion.flags, HTT_DATA_TX_STATUS);
1600         __le16 msdu_id;
1601         int i;
1602
1603         switch (status) {
1604         case HTT_DATA_TX_STATUS_NO_ACK:
1605                 tx_done.status = HTT_TX_COMPL_STATE_NOACK;
1606                 break;
1607         case HTT_DATA_TX_STATUS_OK:
1608                 tx_done.status = HTT_TX_COMPL_STATE_ACK;
1609                 break;
1610         case HTT_DATA_TX_STATUS_DISCARD:
1611         case HTT_DATA_TX_STATUS_POSTPONE:
1612         case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
1613                 tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
1614                 break;
1615         default:
1616                 ath10k_warn(ar, "unhandled tx completion status %d\n", status);
1617                 tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
1618                 break;
1619         }
1620
1621         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
1622                    resp->data_tx_completion.num_msdus);
1623
1624         for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
1625                 msdu_id = resp->data_tx_completion.msdus[i];
1626                 tx_done.msdu_id = __le16_to_cpu(msdu_id);
1627
1628                 /* kfifo_put: In practice firmware shouldn't fire off per-CE
1629                  * interrupt and main interrupt (MSI/-X range case) for the same
1630                  * HTC service so it should be safe to use kfifo_put w/o lock.
1631                  *
1632                  * From kfifo_put() documentation:
1633                  *  Note that with only one concurrent reader and one concurrent
1634                  *  writer, you don't need extra locking to use these macro.
1635                  */
1636                 if (!kfifo_put(&htt->txdone_fifo, tx_done)) {
1637                         ath10k_warn(ar, "txdone fifo overrun, msdu_id %d status %d\n",
1638                                     tx_done.msdu_id, tx_done.status);
1639                         ath10k_txrx_tx_unref(htt, &tx_done);
1640                 }
1641         }
1642 }
1643
1644 static void ath10k_htt_rx_addba(struct ath10k *ar, struct htt_resp *resp)
1645 {
1646         struct htt_rx_addba *ev = &resp->rx_addba;
1647         struct ath10k_peer *peer;
1648         struct ath10k_vif *arvif;
1649         u16 info0, tid, peer_id;
1650
1651         info0 = __le16_to_cpu(ev->info0);
1652         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1653         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1654
1655         ath10k_dbg(ar, ATH10K_DBG_HTT,
1656                    "htt rx addba tid %hu peer_id %hu size %hhu\n",
1657                    tid, peer_id, ev->window_size);
1658
1659         spin_lock_bh(&ar->data_lock);
1660         peer = ath10k_peer_find_by_id(ar, peer_id);
1661         if (!peer) {
1662                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1663                             peer_id);
1664                 spin_unlock_bh(&ar->data_lock);
1665                 return;
1666         }
1667
1668         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1669         if (!arvif) {
1670                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1671                             peer->vdev_id);
1672                 spin_unlock_bh(&ar->data_lock);
1673                 return;
1674         }
1675
1676         ath10k_dbg(ar, ATH10K_DBG_HTT,
1677                    "htt rx start rx ba session sta %pM tid %hu size %hhu\n",
1678                    peer->addr, tid, ev->window_size);
1679
1680         ieee80211_start_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1681         spin_unlock_bh(&ar->data_lock);
1682 }
1683
1684 static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
1685 {
1686         struct htt_rx_delba *ev = &resp->rx_delba;
1687         struct ath10k_peer *peer;
1688         struct ath10k_vif *arvif;
1689         u16 info0, tid, peer_id;
1690
1691         info0 = __le16_to_cpu(ev->info0);
1692         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1693         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1694
1695         ath10k_dbg(ar, ATH10K_DBG_HTT,
1696                    "htt rx delba tid %hu peer_id %hu\n",
1697                    tid, peer_id);
1698
1699         spin_lock_bh(&ar->data_lock);
1700         peer = ath10k_peer_find_by_id(ar, peer_id);
1701         if (!peer) {
1702                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1703                             peer_id);
1704                 spin_unlock_bh(&ar->data_lock);
1705                 return;
1706         }
1707
1708         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1709         if (!arvif) {
1710                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1711                             peer->vdev_id);
1712                 spin_unlock_bh(&ar->data_lock);
1713                 return;
1714         }
1715
1716         ath10k_dbg(ar, ATH10K_DBG_HTT,
1717                    "htt rx stop rx ba session sta %pM tid %hu\n",
1718                    peer->addr, tid);
1719
1720         ieee80211_stop_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1721         spin_unlock_bh(&ar->data_lock);
1722 }
1723
1724 static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
1725                                        struct sk_buff_head *amsdu)
1726 {
1727         struct sk_buff *msdu;
1728         struct htt_rx_desc *rxd;
1729
1730         if (skb_queue_empty(list))
1731                 return -ENOBUFS;
1732
1733         if (WARN_ON(!skb_queue_empty(amsdu)))
1734                 return -EINVAL;
1735
1736         while ((msdu = __skb_dequeue(list))) {
1737                 __skb_queue_tail(amsdu, msdu);
1738
1739                 rxd = (void *)msdu->data - sizeof(*rxd);
1740                 if (rxd->msdu_end.common.info0 &
1741                     __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))
1742                         break;
1743         }
1744
1745         msdu = skb_peek_tail(amsdu);
1746         rxd = (void *)msdu->data - sizeof(*rxd);
1747         if (!(rxd->msdu_end.common.info0 &
1748               __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))) {
1749                 skb_queue_splice_init(amsdu, list);
1750                 return -EAGAIN;
1751         }
1752
1753         return 0;
1754 }
1755
1756 static void ath10k_htt_rx_h_rx_offload_prot(struct ieee80211_rx_status *status,
1757                                             struct sk_buff *skb)
1758 {
1759         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1760
1761         if (!ieee80211_has_protected(hdr->frame_control))
1762                 return;
1763
1764         /* Offloaded frames are already decrypted but firmware insists they are
1765          * protected in the 802.11 header. Strip the flag.  Otherwise mac80211
1766          * will drop the frame.
1767          */
1768
1769         hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1770         status->flag |= RX_FLAG_DECRYPTED |
1771                         RX_FLAG_IV_STRIPPED |
1772                         RX_FLAG_MMIC_STRIPPED;
1773 }
1774
1775 static void ath10k_htt_rx_h_rx_offload(struct ath10k *ar,
1776                                        struct sk_buff_head *list)
1777 {
1778         struct ath10k_htt *htt = &ar->htt;
1779         struct ieee80211_rx_status *status = &htt->rx_status;
1780         struct htt_rx_offload_msdu *rx;
1781         struct sk_buff *msdu;
1782         size_t offset;
1783
1784         while ((msdu = __skb_dequeue(list))) {
1785                 /* Offloaded frames don't have Rx descriptor. Instead they have
1786                  * a short meta information header.
1787                  */
1788
1789                 rx = (void *)msdu->data;
1790
1791                 skb_put(msdu, sizeof(*rx));
1792                 skb_pull(msdu, sizeof(*rx));
1793
1794                 if (skb_tailroom(msdu) < __le16_to_cpu(rx->msdu_len)) {
1795                         ath10k_warn(ar, "dropping frame: offloaded rx msdu is too long!\n");
1796                         dev_kfree_skb_any(msdu);
1797                         continue;
1798                 }
1799
1800                 skb_put(msdu, __le16_to_cpu(rx->msdu_len));
1801
1802                 /* Offloaded rx header length isn't multiple of 2 nor 4 so the
1803                  * actual payload is unaligned. Align the frame.  Otherwise
1804                  * mac80211 complains.  This shouldn't reduce performance much
1805                  * because these offloaded frames are rare.
1806                  */
1807                 offset = 4 - ((unsigned long)msdu->data & 3);
1808                 skb_put(msdu, offset);
1809                 memmove(msdu->data + offset, msdu->data, msdu->len);
1810                 skb_pull(msdu, offset);
1811
1812                 /* FIXME: The frame is NWifi. Re-construct QoS Control
1813                  * if possible later.
1814                  */
1815
1816                 memset(status, 0, sizeof(*status));
1817                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
1818
1819                 ath10k_htt_rx_h_rx_offload_prot(status, msdu);
1820                 ath10k_htt_rx_h_channel(ar, status, NULL, rx->vdev_id);
1821                 ath10k_process_rx(ar, status, msdu);
1822         }
1823 }
1824
1825 static void ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
1826 {
1827         struct ath10k_htt *htt = &ar->htt;
1828         struct htt_resp *resp = (void *)skb->data;
1829         struct ieee80211_rx_status *status = &htt->rx_status;
1830         struct sk_buff_head list;
1831         struct sk_buff_head amsdu;
1832         u16 peer_id;
1833         u16 msdu_count;
1834         u8 vdev_id;
1835         u8 tid;
1836         bool offload;
1837         bool frag;
1838         int ret;
1839
1840         lockdep_assert_held(&htt->rx_ring.lock);
1841
1842         if (htt->rx_confused)
1843                 return;
1844
1845         skb_pull(skb, sizeof(resp->hdr));
1846         skb_pull(skb, sizeof(resp->rx_in_ord_ind));
1847
1848         peer_id = __le16_to_cpu(resp->rx_in_ord_ind.peer_id);
1849         msdu_count = __le16_to_cpu(resp->rx_in_ord_ind.msdu_count);
1850         vdev_id = resp->rx_in_ord_ind.vdev_id;
1851         tid = SM(resp->rx_in_ord_ind.info, HTT_RX_IN_ORD_IND_INFO_TID);
1852         offload = !!(resp->rx_in_ord_ind.info &
1853                         HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
1854         frag = !!(resp->rx_in_ord_ind.info & HTT_RX_IN_ORD_IND_INFO_FRAG_MASK);
1855
1856         ath10k_dbg(ar, ATH10K_DBG_HTT,
1857                    "htt rx in ord vdev %i peer %i tid %i offload %i frag %i msdu count %i\n",
1858                    vdev_id, peer_id, tid, offload, frag, msdu_count);
1859
1860         if (skb->len < msdu_count * sizeof(*resp->rx_in_ord_ind.msdu_descs)) {
1861                 ath10k_warn(ar, "dropping invalid in order rx indication\n");
1862                 return;
1863         }
1864
1865         /* The event can deliver more than 1 A-MSDU. Each A-MSDU is later
1866          * extracted and processed.
1867          */
1868         __skb_queue_head_init(&list);
1869         ret = ath10k_htt_rx_pop_paddr_list(htt, &resp->rx_in_ord_ind, &list);
1870         if (ret < 0) {
1871                 ath10k_warn(ar, "failed to pop paddr list: %d\n", ret);
1872                 htt->rx_confused = true;
1873                 return;
1874         }
1875
1876         /* Offloaded frames are very different and need to be handled
1877          * separately.
1878          */
1879         if (offload)
1880                 ath10k_htt_rx_h_rx_offload(ar, &list);
1881
1882         while (!skb_queue_empty(&list)) {
1883                 __skb_queue_head_init(&amsdu);
1884                 ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
1885                 switch (ret) {
1886                 case 0:
1887                         /* Note: The in-order indication may report interleaved
1888                          * frames from different PPDUs meaning reported rx rate
1889                          * to mac80211 isn't accurate/reliable. It's still
1890                          * better to report something than nothing though. This
1891                          * should still give an idea about rx rate to the user.
1892                          */
1893                         ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
1894                         ath10k_htt_rx_h_filter(ar, &amsdu, status);
1895                         ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
1896                         ath10k_htt_rx_h_deliver(ar, &amsdu, status);
1897                         break;
1898                 case -EAGAIN:
1899                         /* fall through */
1900                 default:
1901                         /* Should not happen. */
1902                         ath10k_warn(ar, "failed to extract amsdu: %d\n", ret);
1903                         htt->rx_confused = true;
1904                         __skb_queue_purge(&list);
1905                         return;
1906                 }
1907         }
1908 }
1909
1910 static void ath10k_htt_rx_tx_fetch_resp_id_confirm(struct ath10k *ar,
1911                                                    const __le32 *resp_ids,
1912                                                    int num_resp_ids)
1913 {
1914         int i;
1915         u32 resp_id;
1916
1917         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm num_resp_ids %d\n",
1918                    num_resp_ids);
1919
1920         for (i = 0; i < num_resp_ids; i++) {
1921                 resp_id = le32_to_cpu(resp_ids[i]);
1922
1923                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm resp_id %u\n",
1924                            resp_id);
1925
1926                 /* TODO: free resp_id */
1927         }
1928 }
1929
1930 static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
1931 {
1932         struct ieee80211_hw *hw = ar->hw;
1933         struct ieee80211_txq *txq;
1934         struct htt_resp *resp = (struct htt_resp *)skb->data;
1935         struct htt_tx_fetch_record *record;
1936         size_t len;
1937         size_t max_num_bytes;
1938         size_t max_num_msdus;
1939         size_t num_bytes;
1940         size_t num_msdus;
1941         const __le32 *resp_ids;
1942         u16 num_records;
1943         u16 num_resp_ids;
1944         u16 peer_id;
1945         u8 tid;
1946         int ret;
1947         int i;
1948
1949         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind\n");
1950
1951         len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_ind);
1952         if (unlikely(skb->len < len)) {
1953                 ath10k_warn(ar, "received corrupted tx_fetch_ind event: buffer too short\n");
1954                 return;
1955         }
1956
1957         num_records = le16_to_cpu(resp->tx_fetch_ind.num_records);
1958         num_resp_ids = le16_to_cpu(resp->tx_fetch_ind.num_resp_ids);
1959
1960         len += sizeof(resp->tx_fetch_ind.records[0]) * num_records;
1961         len += sizeof(resp->tx_fetch_ind.resp_ids[0]) * num_resp_ids;
1962
1963         if (unlikely(skb->len < len)) {
1964                 ath10k_warn(ar, "received corrupted tx_fetch_ind event: too many records/resp_ids\n");
1965                 return;
1966         }
1967
1968         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind num records %hu num resps %hu seq %hu\n",
1969                    num_records, num_resp_ids,
1970                    le16_to_cpu(resp->tx_fetch_ind.fetch_seq_num));
1971
1972         if (!ar->htt.tx_q_state.enabled) {
1973                 ath10k_warn(ar, "received unexpected tx_fetch_ind event: not enabled\n");
1974                 return;
1975         }
1976
1977         if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH) {
1978                 ath10k_warn(ar, "received unexpected tx_fetch_ind event: in push mode\n");
1979                 return;
1980         }
1981
1982         rcu_read_lock();
1983
1984         for (i = 0; i < num_records; i++) {
1985                 record = &resp->tx_fetch_ind.records[i];
1986                 peer_id = MS(le16_to_cpu(record->info),
1987                              HTT_TX_FETCH_RECORD_INFO_PEER_ID);
1988                 tid = MS(le16_to_cpu(record->info),
1989                          HTT_TX_FETCH_RECORD_INFO_TID);
1990                 max_num_msdus = le16_to_cpu(record->num_msdus);
1991                 max_num_bytes = le32_to_cpu(record->num_bytes);
1992
1993                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch record %i peer_id %hu tid %hhu msdus %zu bytes %zu\n",
1994                            i, peer_id, tid, max_num_msdus, max_num_bytes);
1995
1996                 if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
1997                     unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
1998                         ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
1999                                     peer_id, tid);
2000                         continue;
2001                 }
2002
2003                 spin_lock_bh(&ar->data_lock);
2004                 txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
2005                 spin_unlock_bh(&ar->data_lock);
2006
2007                 /* It is okay to release the lock and use txq because RCU read
2008                  * lock is held.
2009                  */
2010
2011                 if (unlikely(!txq)) {
2012                         ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
2013                                     peer_id, tid);
2014                         continue;
2015                 }
2016
2017                 num_msdus = 0;
2018                 num_bytes = 0;
2019
2020                 while (num_msdus < max_num_msdus &&
2021                        num_bytes < max_num_bytes) {
2022                         ret = ath10k_mac_tx_push_txq(hw, txq);
2023                         if (ret < 0)
2024                                 break;
2025
2026                         num_msdus++;
2027                         num_bytes += ret;
2028                 }
2029
2030                 record->num_msdus = cpu_to_le16(num_msdus);
2031                 record->num_bytes = cpu_to_le32(num_bytes);
2032
2033                 ath10k_htt_tx_txq_recalc(hw, txq);
2034         }
2035
2036         rcu_read_unlock();
2037
2038         resp_ids = ath10k_htt_get_tx_fetch_ind_resp_ids(&resp->tx_fetch_ind);
2039         ath10k_htt_rx_tx_fetch_resp_id_confirm(ar, resp_ids, num_resp_ids);
2040
2041         ret = ath10k_htt_tx_fetch_resp(ar,
2042                                        resp->tx_fetch_ind.token,
2043                                        resp->tx_fetch_ind.fetch_seq_num,
2044                                        resp->tx_fetch_ind.records,
2045                                        num_records);
2046         if (unlikely(ret)) {
2047                 ath10k_warn(ar, "failed to submit tx fetch resp for token 0x%08x: %d\n",
2048                             le32_to_cpu(resp->tx_fetch_ind.token), ret);
2049                 /* FIXME: request fw restart */
2050         }
2051
2052         ath10k_htt_tx_txq_sync(ar);
2053 }
2054
2055 static void ath10k_htt_rx_tx_fetch_confirm(struct ath10k *ar,
2056                                            struct sk_buff *skb)
2057 {
2058         const struct htt_resp *resp = (void *)skb->data;
2059         size_t len;
2060         int num_resp_ids;
2061
2062         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm\n");
2063
2064         len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_confirm);
2065         if (unlikely(skb->len < len)) {
2066                 ath10k_warn(ar, "received corrupted tx_fetch_confirm event: buffer too short\n");
2067                 return;
2068         }
2069
2070         num_resp_ids = le16_to_cpu(resp->tx_fetch_confirm.num_resp_ids);
2071         len += sizeof(resp->tx_fetch_confirm.resp_ids[0]) * num_resp_ids;
2072
2073         if (unlikely(skb->len < len)) {
2074                 ath10k_warn(ar, "received corrupted tx_fetch_confirm event: resp_ids buffer overflow\n");
2075                 return;
2076         }
2077
2078         ath10k_htt_rx_tx_fetch_resp_id_confirm(ar,
2079                                                resp->tx_fetch_confirm.resp_ids,
2080                                                num_resp_ids);
2081 }
2082
2083 static void ath10k_htt_rx_tx_mode_switch_ind(struct ath10k *ar,
2084                                              struct sk_buff *skb)
2085 {
2086         const struct htt_resp *resp = (void *)skb->data;
2087         const struct htt_tx_mode_switch_record *record;
2088         struct ieee80211_txq *txq;
2089         struct ath10k_txq *artxq;
2090         size_t len;
2091         size_t num_records;
2092         enum htt_tx_mode_switch_mode mode;
2093         bool enable;
2094         u16 info0;
2095         u16 info1;
2096         u16 threshold;
2097         u16 peer_id;
2098         u8 tid;
2099         int i;
2100
2101         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx mode switch ind\n");
2102
2103         len = sizeof(resp->hdr) + sizeof(resp->tx_mode_switch_ind);
2104         if (unlikely(skb->len < len)) {
2105                 ath10k_warn(ar, "received corrupted tx_mode_switch_ind event: buffer too short\n");
2106                 return;
2107         }
2108
2109         info0 = le16_to_cpu(resp->tx_mode_switch_ind.info0);
2110         info1 = le16_to_cpu(resp->tx_mode_switch_ind.info1);
2111
2112         enable = !!(info0 & HTT_TX_MODE_SWITCH_IND_INFO0_ENABLE);
2113         num_records = MS(info0, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);
2114         mode = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_MODE);
2115         threshold = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);
2116
2117         ath10k_dbg(ar, ATH10K_DBG_HTT,
2118                    "htt rx tx mode switch ind info0 0x%04hx info1 0x%04hx enable %d num records %zd mode %d threshold %hu\n",
2119                    info0, info1, enable, num_records, mode, threshold);
2120
2121         len += sizeof(resp->tx_mode_switch_ind.records[0]) * num_records;
2122
2123         if (unlikely(skb->len < len)) {
2124                 ath10k_warn(ar, "received corrupted tx_mode_switch_mode_ind event: too many records\n");
2125                 return;
2126         }
2127
2128         switch (mode) {
2129         case HTT_TX_MODE_SWITCH_PUSH:
2130         case HTT_TX_MODE_SWITCH_PUSH_PULL:
2131                 break;
2132         default:
2133                 ath10k_warn(ar, "received invalid tx_mode_switch_mode_ind mode %d, ignoring\n",
2134                             mode);
2135                 return;
2136         }
2137
2138         if (!enable)
2139                 return;
2140
2141         ar->htt.tx_q_state.enabled = enable;
2142         ar->htt.tx_q_state.mode = mode;
2143         ar->htt.tx_q_state.num_push_allowed = threshold;
2144
2145         rcu_read_lock();
2146
2147         for (i = 0; i < num_records; i++) {
2148                 record = &resp->tx_mode_switch_ind.records[i];
2149                 info0 = le16_to_cpu(record->info0);
2150                 peer_id = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_PEER_ID);
2151                 tid = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_TID);
2152
2153                 if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
2154                     unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
2155                         ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
2156                                     peer_id, tid);
2157                         continue;
2158                 }
2159
2160                 spin_lock_bh(&ar->data_lock);
2161                 txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
2162                 spin_unlock_bh(&ar->data_lock);
2163
2164                 /* It is okay to release the lock and use txq because RCU read
2165                  * lock is held.
2166                  */
2167
2168                 if (unlikely(!txq)) {
2169                         ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
2170                                     peer_id, tid);
2171                         continue;
2172                 }
2173
2174                 spin_lock_bh(&ar->htt.tx_lock);
2175                 artxq = (void *)txq->drv_priv;
2176                 artxq->num_push_allowed = le16_to_cpu(record->num_max_msdus);
2177                 spin_unlock_bh(&ar->htt.tx_lock);
2178         }
2179
2180         rcu_read_unlock();
2181
2182         ath10k_mac_tx_push_pending(ar);
2183 }
2184
2185 void ath10k_htt_htc_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
2186 {
2187         bool release;
2188
2189         release = ath10k_htt_t2h_msg_handler(ar, skb);
2190
2191         /* Free the indication buffer */
2192         if (release)
2193                 dev_kfree_skb_any(skb);
2194 }
2195
2196 bool ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
2197 {
2198         struct ath10k_htt *htt = &ar->htt;
2199         struct htt_resp *resp = (struct htt_resp *)skb->data;
2200         enum htt_t2h_msg_type type;
2201
2202         /* confirm alignment */
2203         if (!IS_ALIGNED((unsigned long)skb->data, 4))
2204                 ath10k_warn(ar, "unaligned htt message, expect trouble\n");
2205
2206         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, msg_type: 0x%0X\n",
2207                    resp->hdr.msg_type);
2208
2209         if (resp->hdr.msg_type >= ar->htt.t2h_msg_types_max) {
2210                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, unsupported msg_type: 0x%0X\n max: 0x%0X",
2211                            resp->hdr.msg_type, ar->htt.t2h_msg_types_max);
2212                 return true;
2213         }
2214         type = ar->htt.t2h_msg_types[resp->hdr.msg_type];
2215
2216         switch (type) {
2217         case HTT_T2H_MSG_TYPE_VERSION_CONF: {
2218                 htt->target_version_major = resp->ver_resp.major;
2219                 htt->target_version_minor = resp->ver_resp.minor;
2220                 complete(&htt->target_version_received);
2221                 break;
2222         }
2223         case HTT_T2H_MSG_TYPE_RX_IND:
2224                 ath10k_htt_rx_proc_rx_ind(htt, &resp->rx_ind);
2225                 break;
2226         case HTT_T2H_MSG_TYPE_PEER_MAP: {
2227                 struct htt_peer_map_event ev = {
2228                         .vdev_id = resp->peer_map.vdev_id,
2229                         .peer_id = __le16_to_cpu(resp->peer_map.peer_id),
2230                 };
2231                 memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
2232                 ath10k_peer_map_event(htt, &ev);
2233                 break;
2234         }
2235         case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
2236                 struct htt_peer_unmap_event ev = {
2237                         .peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
2238                 };
2239                 ath10k_peer_unmap_event(htt, &ev);
2240                 break;
2241         }
2242         case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
2243                 struct htt_tx_done tx_done = {};
2244                 int status = __le32_to_cpu(resp->mgmt_tx_completion.status);
2245
2246                 tx_done.msdu_id = __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
2247
2248                 switch (status) {
2249                 case HTT_MGMT_TX_STATUS_OK:
2250                         tx_done.status = HTT_TX_COMPL_STATE_ACK;
2251                         break;
2252                 case HTT_MGMT_TX_STATUS_RETRY:
2253                         tx_done.status = HTT_TX_COMPL_STATE_NOACK;
2254                         break;
2255                 case HTT_MGMT_TX_STATUS_DROP:
2256                         tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
2257                         break;
2258                 }
2259
2260                 status = ath10k_txrx_tx_unref(htt, &tx_done);
2261                 if (!status) {
2262                         spin_lock_bh(&htt->tx_lock);
2263                         ath10k_htt_tx_mgmt_dec_pending(htt);
2264                         spin_unlock_bh(&htt->tx_lock);
2265                 }
2266                 break;
2267         }
2268         case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
2269                 ath10k_htt_rx_tx_compl_ind(htt->ar, skb);
2270                 tasklet_schedule(&htt->txrx_compl_task);
2271                 break;
2272         case HTT_T2H_MSG_TYPE_SEC_IND: {
2273                 struct ath10k *ar = htt->ar;
2274                 struct htt_security_indication *ev = &resp->security_indication;
2275
2276                 ath10k_dbg(ar, ATH10K_DBG_HTT,
2277                            "sec ind peer_id %d unicast %d type %d\n",
2278                           __le16_to_cpu(ev->peer_id),
2279                           !!(ev->flags & HTT_SECURITY_IS_UNICAST),
2280                           MS(ev->flags, HTT_SECURITY_TYPE));
2281                 complete(&ar->install_key_done);
2282                 break;
2283         }
2284         case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
2285                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2286                                 skb->data, skb->len);
2287                 ath10k_htt_rx_frag_handler(htt);
2288                 break;
2289         }
2290         case HTT_T2H_MSG_TYPE_TEST:
2291                 break;
2292         case HTT_T2H_MSG_TYPE_STATS_CONF:
2293                 trace_ath10k_htt_stats(ar, skb->data, skb->len);
2294                 break;
2295         case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
2296                 /* Firmware can return tx frames if it's unable to fully
2297                  * process them and suspects host may be able to fix it. ath10k
2298                  * sends all tx frames as already inspected so this shouldn't
2299                  * happen unless fw has a bug.
2300                  */
2301                 ath10k_warn(ar, "received an unexpected htt tx inspect event\n");
2302                 break;
2303         case HTT_T2H_MSG_TYPE_RX_ADDBA:
2304                 ath10k_htt_rx_addba(ar, resp);
2305                 break;
2306         case HTT_T2H_MSG_TYPE_RX_DELBA:
2307                 ath10k_htt_rx_delba(ar, resp);
2308                 break;
2309         case HTT_T2H_MSG_TYPE_PKTLOG: {
2310                 trace_ath10k_htt_pktlog(ar, resp->pktlog_msg.payload,
2311                                         skb->len -
2312                                         offsetof(struct htt_resp,
2313                                                  pktlog_msg.payload));
2314                 break;
2315         }
2316         case HTT_T2H_MSG_TYPE_RX_FLUSH: {
2317                 /* Ignore this event because mac80211 takes care of Rx
2318                  * aggregation reordering.
2319                  */
2320                 break;
2321         }
2322         case HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND: {
2323                 skb_queue_tail(&htt->rx_in_ord_compl_q, skb);
2324                 tasklet_schedule(&htt->txrx_compl_task);
2325                 return false;
2326         }
2327         case HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND:
2328                 break;
2329         case HTT_T2H_MSG_TYPE_CHAN_CHANGE: {
2330                 u32 phymode = __le32_to_cpu(resp->chan_change.phymode);
2331                 u32 freq = __le32_to_cpu(resp->chan_change.freq);
2332
2333                 ar->tgt_oper_chan =
2334                         __ieee80211_get_channel(ar->hw->wiphy, freq);
2335                 ath10k_dbg(ar, ATH10K_DBG_HTT,
2336                            "htt chan change freq %u phymode %s\n",
2337                            freq, ath10k_wmi_phymode_str(phymode));
2338                 break;
2339         }
2340         case HTT_T2H_MSG_TYPE_AGGR_CONF:
2341                 break;
2342         case HTT_T2H_MSG_TYPE_TX_FETCH_IND: {
2343                 struct sk_buff *tx_fetch_ind = skb_copy(skb, GFP_ATOMIC);
2344
2345                 if (!tx_fetch_ind) {
2346                         ath10k_warn(ar, "failed to copy htt tx fetch ind\n");
2347                         break;
2348                 }
2349                 skb_queue_tail(&htt->tx_fetch_ind_q, tx_fetch_ind);
2350                 tasklet_schedule(&htt->txrx_compl_task);
2351                 break;
2352         }
2353         case HTT_T2H_MSG_TYPE_TX_FETCH_CONFIRM:
2354                 ath10k_htt_rx_tx_fetch_confirm(ar, skb);
2355                 break;
2356         case HTT_T2H_MSG_TYPE_TX_MODE_SWITCH_IND:
2357                 ath10k_htt_rx_tx_mode_switch_ind(ar, skb);
2358                 break;
2359         case HTT_T2H_MSG_TYPE_EN_STATS:
2360         default:
2361                 ath10k_warn(ar, "htt event (%d) not handled\n",
2362                             resp->hdr.msg_type);
2363                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2364                                 skb->data, skb->len);
2365                 break;
2366         };
2367         return true;
2368 }
2369 EXPORT_SYMBOL(ath10k_htt_t2h_msg_handler);
2370
2371 void ath10k_htt_rx_pktlog_completion_handler(struct ath10k *ar,
2372                                              struct sk_buff *skb)
2373 {
2374         trace_ath10k_htt_pktlog(ar, skb->data, skb->len);
2375         dev_kfree_skb_any(skb);
2376 }
2377 EXPORT_SYMBOL(ath10k_htt_rx_pktlog_completion_handler);
2378
2379 static void ath10k_htt_txrx_compl_task(unsigned long ptr)
2380 {
2381         struct ath10k_htt *htt = (struct ath10k_htt *)ptr;
2382         struct ath10k *ar = htt->ar;
2383         struct htt_tx_done tx_done = {};
2384         struct sk_buff_head rx_ind_q;
2385         struct sk_buff_head tx_ind_q;
2386         struct sk_buff *skb;
2387         unsigned long flags;
2388         int num_mpdus;
2389
2390         __skb_queue_head_init(&rx_ind_q);
2391         __skb_queue_head_init(&tx_ind_q);
2392
2393         spin_lock_irqsave(&htt->rx_in_ord_compl_q.lock, flags);
2394         skb_queue_splice_init(&htt->rx_in_ord_compl_q, &rx_ind_q);
2395         spin_unlock_irqrestore(&htt->rx_in_ord_compl_q.lock, flags);
2396
2397         spin_lock_irqsave(&htt->tx_fetch_ind_q.lock, flags);
2398         skb_queue_splice_init(&htt->tx_fetch_ind_q, &tx_ind_q);
2399         spin_unlock_irqrestore(&htt->tx_fetch_ind_q.lock, flags);
2400
2401         /* kfifo_get: called only within txrx_tasklet so it's neatly serialized.
2402          * From kfifo_get() documentation:
2403          *  Note that with only one concurrent reader and one concurrent writer,
2404          *  you don't need extra locking to use these macro.
2405          */
2406         while (kfifo_get(&htt->txdone_fifo, &tx_done))
2407                 ath10k_txrx_tx_unref(htt, &tx_done);
2408
2409         while ((skb = __skb_dequeue(&tx_ind_q))) {
2410                 ath10k_htt_rx_tx_fetch_ind(ar, skb);
2411                 dev_kfree_skb_any(skb);
2412         }
2413
2414         num_mpdus = atomic_read(&htt->num_mpdus_ready);
2415
2416         while (num_mpdus) {
2417                 if (ath10k_htt_rx_handle_amsdu(htt))
2418                         break;
2419
2420                 num_mpdus--;
2421                 atomic_dec(&htt->num_mpdus_ready);
2422         }
2423
2424         while ((skb = __skb_dequeue(&rx_ind_q))) {
2425                 spin_lock_bh(&htt->rx_ring.lock);
2426                 ath10k_htt_rx_in_ord_ind(ar, skb);
2427                 spin_unlock_bh(&htt->rx_ring.lock);
2428                 dev_kfree_skb_any(skb);
2429         }
2430
2431         ath10k_htt_rx_msdu_buff_replenish(htt);
2432 }