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
  38 static struct sk_buff *
  39 ath10k_htt_rx_find_skb_paddr(struct ath10k *ar, u32 paddr)
  40 {
  41         struct ath10k_skb_rxcb *rxcb;
  42
  43         hash_for_each_possible(ar->htt.rx_ring.skb_table, rxcb, hlist, paddr)
  44                 if (rxcb->paddr == paddr)
  45                         return ATH10K_RXCB_SKB(rxcb);
  46
  47         WARN_ON_ONCE(1);
  48         return NULL;
  49 }
  50
  51 static void ath10k_htt_rx_ring_free(struct ath10k_htt *htt)
  52 {
  53         struct sk_buff *skb;
  54         struct ath10k_skb_rxcb *rxcb;
  55         struct hlist_node *n;
  56         int i;
  57
  58         if (htt->rx_ring.in_ord_rx) {
  59                 hash_for_each_safe(htt->rx_ring.skb_table, i, n, rxcb, hlist) {
  60                         skb = ATH10K_RXCB_SKB(rxcb);
  61                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  62                                          skb->len + skb_tailroom(skb),
  63                                          DMA_FROM_DEVICE);
  64                         hash_del(&rxcb->hlist);
  65                         dev_kfree_skb_any(skb);
  66                 }
  67         } else {
  68                 for (i = 0; i < htt->rx_ring.size; i++) {
  69                         skb = htt->rx_ring.netbufs_ring[i];
  70                         if (!skb)
  71                                 continue;
  72
  73                         rxcb = ATH10K_SKB_RXCB(skb);
  74                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  75                                          skb->len + skb_tailroom(skb),
  76                                          DMA_FROM_DEVICE);
  77                         dev_kfree_skb_any(skb);
  78                 }
  79         }
  80
  81         htt->rx_ring.fill_cnt = 0;
  82         hash_init(htt->rx_ring.skb_table);
  83         memset(htt->rx_ring.netbufs_ring, 0,
  84                htt->rx_ring.size * sizeof(htt->rx_ring.netbufs_ring[0]));
  85 }
  86
  87 static int __ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
  88 {
  89         struct htt_rx_desc *rx_desc;
  90         struct ath10k_skb_rxcb *rxcb;
  91         struct sk_buff *skb;
  92         dma_addr_t paddr;
  93         int ret = 0, idx;
  94
  95         /* The Full Rx Reorder firmware has no way of telling the host
  96          * implicitly when it copied HTT Rx Ring buffers to MAC Rx Ring.
  97          * To keep things simple make sure ring is always half empty. This
  98          * guarantees there'll be no replenishment overruns possible.
  99          */
 100         BUILD_BUG_ON(HTT_RX_RING_FILL_LEVEL >= HTT_RX_RING_SIZE / 2);
 101
 102         idx = __le32_to_cpu(*htt->rx_ring.alloc_idx.vaddr);
 103         while (num > 0) {
 104                 skb = dev_alloc_skb(HTT_RX_BUF_SIZE + HTT_RX_DESC_ALIGN);
 105                 if (!skb) {
 106                         ret = -ENOMEM;
 107                         goto fail;
 108                 }
 109
 110                 if (!IS_ALIGNED((unsigned long)skb->data, HTT_RX_DESC_ALIGN))
 111                         skb_pull(skb,
 112                                  PTR_ALIGN(skb->data, HTT_RX_DESC_ALIGN) -
 113                                  skb->data);
 114
 115                 /* Clear rx_desc attention word before posting to Rx ring */
 116                 rx_desc = (struct htt_rx_desc *)skb->data;
 117                 rx_desc->attention.flags = __cpu_to_le32(0);
 118
 119                 paddr = dma_map_single(htt->ar->dev, skb->data,
 120                                        skb->len + skb_tailroom(skb),
 121                                        DMA_FROM_DEVICE);
 122
 123                 if (unlikely(dma_mapping_error(htt->ar->dev, paddr))) {
 124                         dev_kfree_skb_any(skb);
 125                         ret = -ENOMEM;
 126                         goto fail;
 127                 }
 128
 129                 rxcb = ATH10K_SKB_RXCB(skb);
 130                 rxcb->paddr = paddr;
 131                 htt->rx_ring.netbufs_ring[idx] = skb;
 132                 htt->rx_ring.paddrs_ring[idx] = __cpu_to_le32(paddr);
 133                 htt->rx_ring.fill_cnt++;
 134
 135                 if (htt->rx_ring.in_ord_rx) {
 136                         hash_add(htt->rx_ring.skb_table,
 137                                  &ATH10K_SKB_RXCB(skb)->hlist,
 138                                  (u32)paddr);
 139                 }
 140
 141                 num--;
 142                 idx++;
 143                 idx &= htt->rx_ring.size_mask;
 144         }
 145
 146 fail:
 147         /*
 148          * Make sure the rx buffer is updated before available buffer
 149          * index to avoid any potential rx ring corruption.
 150          */
 151         mb();
 152         *htt->rx_ring.alloc_idx.vaddr = __cpu_to_le32(idx);
 153         return ret;
 154 }
 155
 156 static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
 157 {
 158         lockdep_assert_held(&htt->rx_ring.lock);
 159         return __ath10k_htt_rx_ring_fill_n(htt, num);
 160 }
 161
 162 static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
 163 {
 164         int ret, num_deficit, num_to_fill;
 165
 166         /* Refilling the whole RX ring buffer proves to be a bad idea. The
 167          * reason is RX may take up significant amount of CPU cycles and starve
 168          * other tasks, e.g. TX on an ethernet device while acting as a bridge
 169          * with ath10k wlan interface. This ended up with very poor performance
 170          * once CPU the host system was overwhelmed with RX on ath10k.
 171          *
 172          * By limiting the number of refills the replenishing occurs
 173          * progressively. This in turns makes use of the fact tasklets are
 174          * processed in FIFO order. This means actual RX processing can starve
 175          * out refilling. If there's not enough buffers on RX ring FW will not
 176          * report RX until it is refilled with enough buffers. This
 177          * automatically balances load wrt to CPU power.
 178          *
 179          * This probably comes at a cost of lower maximum throughput but
 180          * improves the average and stability.
 181          */
 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
 230         skb_queue_purge(&htt->rx_compl_q);
 231         skb_queue_purge(&htt->rx_in_ord_compl_q);
 232         skb_queue_purge(&htt->tx_fetch_ind_q);
 233
 234         ath10k_htt_rx_ring_free(htt);
 235
 236         dma_free_coherent(htt->ar->dev,
 237                           (htt->rx_ring.size *
 238                            sizeof(htt->rx_ring.paddrs_ring)),
 239                           htt->rx_ring.paddrs_ring,
 240                           htt->rx_ring.base_paddr);
 241
 242         dma_free_coherent(htt->ar->dev,
 243                           sizeof(*htt->rx_ring.alloc_idx.vaddr),
 244                           htt->rx_ring.alloc_idx.vaddr,
 245                           htt->rx_ring.alloc_idx.paddr);
 246
 247         kfree(htt->rx_ring.netbufs_ring);
 248 }
 249
 250 static inline struct sk_buff *ath10k_htt_rx_netbuf_pop(struct ath10k_htt *htt)
 251 {
 252         struct ath10k *ar = htt->ar;
 253         int idx;
 254         struct sk_buff *msdu;
 255
 256         lockdep_assert_held(&htt->rx_ring.lock);
 257
 258         if (htt->rx_ring.fill_cnt == 0) {
 259                 ath10k_warn(ar, "tried to pop sk_buff from an empty rx ring\n");
 260                 return NULL;
 261         }
 262
 263         idx = htt->rx_ring.sw_rd_idx.msdu_payld;
 264         msdu = htt->rx_ring.netbufs_ring[idx];
 265         htt->rx_ring.netbufs_ring[idx] = NULL;
 266         htt->rx_ring.paddrs_ring[idx] = 0;
 267
 268         idx++;
 269         idx &= htt->rx_ring.size_mask;
 270         htt->rx_ring.sw_rd_idx.msdu_payld = idx;
 271         htt->rx_ring.fill_cnt--;
 272
 273         dma_unmap_single(htt->ar->dev,
 274                          ATH10K_SKB_RXCB(msdu)->paddr,
 275                          msdu->len + skb_tailroom(msdu),
 276                          DMA_FROM_DEVICE);
 277         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
 278                         msdu->data, msdu->len + skb_tailroom(msdu));
 279
 280         return msdu;
 281 }
 282
 283 /* return: < 0 fatal error, 0 - non chained msdu, 1 chained msdu */
 284 static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
 285                                    struct sk_buff_head *amsdu)
 286 {
 287         struct ath10k *ar = htt->ar;
 288         int msdu_len, msdu_chaining = 0;
 289         struct sk_buff *msdu;
 290         struct htt_rx_desc *rx_desc;
 291
 292         lockdep_assert_held(&htt->rx_ring.lock);
 293
 294         for (;;) {
 295                 int last_msdu, msdu_len_invalid, msdu_chained;
 296
 297                 msdu = ath10k_htt_rx_netbuf_pop(htt);
 298                 if (!msdu) {
 299                         __skb_queue_purge(amsdu);
 300                         return -ENOENT;
 301                 }
 302
 303                 __skb_queue_tail(amsdu, msdu);
 304
 305                 rx_desc = (struct htt_rx_desc *)msdu->data;
 306
 307                 /* FIXME: we must report msdu payload since this is what caller
 308                  * expects now
 309                  */
 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         ath10k_dbg(ar, ATH10K_DBG_BOOT, "htt rx ring size %d fill_level %d\n",
 524                    htt->rx_ring.size, htt->rx_ring.fill_level);
 525         return 0;
 526
 527 err_dma_idx:
 528         dma_free_coherent(htt->ar->dev,
 529                           (htt->rx_ring.size *
 530                            sizeof(htt->rx_ring.paddrs_ring)),
 531                           htt->rx_ring.paddrs_ring,
 532                           htt->rx_ring.base_paddr);
 533 err_dma_ring:
 534         kfree(htt->rx_ring.netbufs_ring);
 535 err_netbuf:
 536         return -ENOMEM;
 537 }
 538
 539 static int ath10k_htt_rx_crypto_param_len(struct ath10k *ar,
 540                                           enum htt_rx_mpdu_encrypt_type type)
 541 {
 542         switch (type) {
 543         case HTT_RX_MPDU_ENCRYPT_NONE:
 544                 return 0;
 545         case HTT_RX_MPDU_ENCRYPT_WEP40:
 546         case HTT_RX_MPDU_ENCRYPT_WEP104:
 547                 return IEEE80211_WEP_IV_LEN;
 548         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 549         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 550                 return IEEE80211_TKIP_IV_LEN;
 551         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 552                 return IEEE80211_CCMP_HDR_LEN;
 553         case HTT_RX_MPDU_ENCRYPT_WEP128:
 554         case HTT_RX_MPDU_ENCRYPT_WAPI:
 555                 break;
 556         }
 557
 558         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 559         return 0;
 560 }
 561
 562 #define MICHAEL_MIC_LEN 8
 563
 564 static int ath10k_htt_rx_crypto_tail_len(struct ath10k *ar,
 565                                          enum htt_rx_mpdu_encrypt_type type)
 566 {
 567         switch (type) {
 568         case HTT_RX_MPDU_ENCRYPT_NONE:
 569                 return 0;
 570         case HTT_RX_MPDU_ENCRYPT_WEP40:
 571         case HTT_RX_MPDU_ENCRYPT_WEP104:
 572                 return IEEE80211_WEP_ICV_LEN;
 573         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 574         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 575                 return IEEE80211_TKIP_ICV_LEN;
 576         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 577                 return IEEE80211_CCMP_MIC_LEN;
 578         case HTT_RX_MPDU_ENCRYPT_WEP128:
 579         case HTT_RX_MPDU_ENCRYPT_WAPI:
 580                 break;
 581         }
 582
 583         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 584         return 0;
 585 }
 586
 587 struct amsdu_subframe_hdr {
 588         u8 dst[ETH_ALEN];
 589         u8 src[ETH_ALEN];
 590         __be16 len;
 591 } __packed;
 592
 593 #define GROUP_ID_IS_SU_MIMO(x) ((x) == 0 || (x) == 63)
 594
 595 static void ath10k_htt_rx_h_rates(struct ath10k *ar,
 596                                   struct ieee80211_rx_status *status,
 597                                   struct htt_rx_desc *rxd)
 598 {
 599         struct ieee80211_supported_band *sband;
 600         u8 cck, rate, bw, sgi, mcs, nss;
 601         u8 preamble = 0;
 602         u8 group_id;
 603         u32 info1, info2, info3;
 604
 605         info1 = __le32_to_cpu(rxd->ppdu_start.info1);
 606         info2 = __le32_to_cpu(rxd->ppdu_start.info2);
 607         info3 = __le32_to_cpu(rxd->ppdu_start.info3);
 608
 609         preamble = MS(info1, RX_PPDU_START_INFO1_PREAMBLE_TYPE);
 610
 611         switch (preamble) {
 612         case HTT_RX_LEGACY:
 613                 /* To get legacy rate index band is required. Since band can't
 614                  * be undefined check if freq is non-zero.
 615                  */
 616                 if (!status->freq)
 617                         return;
 618
 619                 cck = info1 & RX_PPDU_START_INFO1_L_SIG_RATE_SELECT;
 620                 rate = MS(info1, RX_PPDU_START_INFO1_L_SIG_RATE);
 621                 rate &= ~RX_PPDU_START_RATE_FLAG;
 622
 623                 sband = &ar->mac.sbands[status->band];
 624                 status->rate_idx = ath10k_mac_hw_rate_to_idx(sband, rate, cck);
 625                 break;
 626         case HTT_RX_HT:
 627         case HTT_RX_HT_WITH_TXBF:
 628                 /* HT-SIG - Table 20-11 in info2 and info3 */
 629                 mcs = info2 & 0x1F;
 630                 nss = mcs >> 3;
 631                 bw = (info2 >> 7) & 1;
 632                 sgi = (info3 >> 7) & 1;
 633
 634                 status->rate_idx = mcs;
 635                 status->encoding = RX_ENC_HT;
 636                 if (sgi)
 637                         status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 638                 if (bw)
 639                         status->bw = RATE_INFO_BW_40;
 640                 break;
 641         case HTT_RX_VHT:
 642         case HTT_RX_VHT_WITH_TXBF:
 643                 /* VHT-SIG-A1 in info2, VHT-SIG-A2 in info3
 644                  * TODO check this
 645                  */
 646                 bw = info2 & 3;
 647                 sgi = info3 & 1;
 648                 group_id = (info2 >> 4) & 0x3F;
 649
 650                 if (GROUP_ID_IS_SU_MIMO(group_id)) {
 651                         mcs = (info3 >> 4) & 0x0F;
 652                         nss = ((info2 >> 10) & 0x07) + 1;
 653                 } else {
 654                         /* Hardware doesn't decode VHT-SIG-B into Rx descriptor
 655                          * so it's impossible to decode MCS. Also since
 656                          * firmware consumes Group Id Management frames host
 657                          * has no knowledge regarding group/user position
 658                          * mapping so it's impossible to pick the correct Nsts
 659                          * from VHT-SIG-A1.
 660                          *
 661                          * Bandwidth and SGI are valid so report the rateinfo
 662                          * on best-effort basis.
 663                          */
 664                         mcs = 0;
 665                         nss = 1;
 666                 }
 667
 668                 if (mcs > 0x09) {
 669                         ath10k_warn(ar, "invalid MCS received %u\n", mcs);
 670                         ath10k_warn(ar, "rxd %08x mpdu start %08x %08x msdu start %08x %08x ppdu start %08x %08x %08x %08x %08x\n",
 671                                     __le32_to_cpu(rxd->attention.flags),
 672                                     __le32_to_cpu(rxd->mpdu_start.info0),
 673                                     __le32_to_cpu(rxd->mpdu_start.info1),
 674                                     __le32_to_cpu(rxd->msdu_start.common.info0),
 675                                     __le32_to_cpu(rxd->msdu_start.common.info1),
 676                                     rxd->ppdu_start.info0,
 677                                     __le32_to_cpu(rxd->ppdu_start.info1),
 678                                     __le32_to_cpu(rxd->ppdu_start.info2),
 679                                     __le32_to_cpu(rxd->ppdu_start.info3),
 680                                     __le32_to_cpu(rxd->ppdu_start.info4));
 681
 682                         ath10k_warn(ar, "msdu end %08x mpdu end %08x\n",
 683                                     __le32_to_cpu(rxd->msdu_end.common.info0),
 684                                     __le32_to_cpu(rxd->mpdu_end.info0));
 685
 686                         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL,
 687                                         "rx desc msdu payload: ",
 688                                         rxd->msdu_payload, 50);
 689                 }
 690
 691                 status->rate_idx = mcs;
 692                 status->nss = nss;
 693
 694                 if (sgi)
 695                         status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 696
 697                 switch (bw) {
 698                 /* 20MHZ */
 699                 case 0:
 700                         break;
 701                 /* 40MHZ */
 702                 case 1:
 703                         status->bw = RATE_INFO_BW_40;
 704                         break;
 705                 /* 80MHZ */
 706                 case 2:
 707                         status->bw = RATE_INFO_BW_80;
 708                         break;
 709                 case 3:
 710                         status->bw = RATE_INFO_BW_160;
 711                         break;
 712                 }
 713
 714                 status->encoding = RX_ENC_VHT;
 715                 break;
 716         default:
 717                 break;
 718         }
 719 }
 720
 721 static struct ieee80211_channel *
 722 ath10k_htt_rx_h_peer_channel(struct ath10k *ar, struct htt_rx_desc *rxd)
 723 {
 724         struct ath10k_peer *peer;
 725         struct ath10k_vif *arvif;
 726         struct cfg80211_chan_def def;
 727         u16 peer_id;
 728
 729         lockdep_assert_held(&ar->data_lock);
 730
 731         if (!rxd)
 732                 return NULL;
 733
 734         if (rxd->attention.flags &
 735             __cpu_to_le32(RX_ATTENTION_FLAGS_PEER_IDX_INVALID))
 736                 return NULL;
 737
 738         if (!(rxd->msdu_end.common.info0 &
 739               __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU)))
 740                 return NULL;
 741
 742         peer_id = MS(__le32_to_cpu(rxd->mpdu_start.info0),
 743                      RX_MPDU_START_INFO0_PEER_IDX);
 744
 745         peer = ath10k_peer_find_by_id(ar, peer_id);
 746         if (!peer)
 747                 return NULL;
 748
 749         arvif = ath10k_get_arvif(ar, peer->vdev_id);
 750         if (WARN_ON_ONCE(!arvif))
 751                 return NULL;
 752
 753         if (ath10k_mac_vif_chan(arvif->vif, &def))
 754                 return NULL;
 755
 756         return def.chan;
 757 }
 758
 759 static struct ieee80211_channel *
 760 ath10k_htt_rx_h_vdev_channel(struct ath10k *ar, u32 vdev_id)
 761 {
 762         struct ath10k_vif *arvif;
 763         struct cfg80211_chan_def def;
 764
 765         lockdep_assert_held(&ar->data_lock);
 766
 767         list_for_each_entry(arvif, &ar->arvifs, list) {
 768                 if (arvif->vdev_id == vdev_id &&
 769                     ath10k_mac_vif_chan(arvif->vif, &def) == 0)
 770                         return def.chan;
 771         }
 772
 773         return NULL;
 774 }
 775
 776 static void
 777 ath10k_htt_rx_h_any_chan_iter(struct ieee80211_hw *hw,
 778                               struct ieee80211_chanctx_conf *conf,
 779                               void *data)
 780 {
 781         struct cfg80211_chan_def *def = data;
 782
 783         *def = conf->def;
 784 }
 785
 786 static struct ieee80211_channel *
 787 ath10k_htt_rx_h_any_channel(struct ath10k *ar)
 788 {
 789         struct cfg80211_chan_def def = {};
 790
 791         ieee80211_iter_chan_contexts_atomic(ar->hw,
 792                                             ath10k_htt_rx_h_any_chan_iter,
 793                                             &def);
 794
 795         return def.chan;
 796 }
 797
 798 static bool ath10k_htt_rx_h_channel(struct ath10k *ar,
 799                                     struct ieee80211_rx_status *status,
 800                                     struct htt_rx_desc *rxd,
 801                                     u32 vdev_id)
 802 {
 803         struct ieee80211_channel *ch;
 804
 805         spin_lock_bh(&ar->data_lock);
 806         ch = ar->scan_channel;
 807         if (!ch)
 808                 ch = ar->rx_channel;
 809         if (!ch)
 810                 ch = ath10k_htt_rx_h_peer_channel(ar, rxd);
 811         if (!ch)
 812                 ch = ath10k_htt_rx_h_vdev_channel(ar, vdev_id);
 813         if (!ch)
 814                 ch = ath10k_htt_rx_h_any_channel(ar);
 815         if (!ch)
 816                 ch = ar->tgt_oper_chan;
 817         spin_unlock_bh(&ar->data_lock);
 818
 819         if (!ch)
 820                 return false;
 821
 822         status->band = ch->band;
 823         status->freq = ch->center_freq;
 824
 825         return true;
 826 }
 827
 828 static void ath10k_htt_rx_h_signal(struct ath10k *ar,
 829                                    struct ieee80211_rx_status *status,
 830                                    struct htt_rx_desc *rxd)
 831 {
 832         /* FIXME: Get real NF */
 833         status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
 834                          rxd->ppdu_start.rssi_comb;
 835         status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
 836 }
 837
 838 static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
 839                                     struct ieee80211_rx_status *status,
 840                                     struct htt_rx_desc *rxd)
 841 {
 842         /* FIXME: TSF is known only at the end of PPDU, in the last MPDU. This
 843          * means all prior MSDUs in a PPDU are reported to mac80211 without the
 844          * TSF. Is it worth holding frames until end of PPDU is known?
 845          *
 846          * FIXME: Can we get/compute 64bit TSF?
 847          */
 848         status->mactime = __le32_to_cpu(rxd->ppdu_end.common.tsf_timestamp);
 849         status->flag |= RX_FLAG_MACTIME_END;
 850 }
 851
 852 static void ath10k_htt_rx_h_ppdu(struct ath10k *ar,
 853                                  struct sk_buff_head *amsdu,
 854                                  struct ieee80211_rx_status *status,
 855                                  u32 vdev_id)
 856 {
 857         struct sk_buff *first;
 858         struct htt_rx_desc *rxd;
 859         bool is_first_ppdu;
 860         bool is_last_ppdu;
 861
 862         if (skb_queue_empty(amsdu))
 863                 return;
 864
 865         first = skb_peek(amsdu);
 866         rxd = (void *)first->data - sizeof(*rxd);
 867
 868         is_first_ppdu = !!(rxd->attention.flags &
 869                            __cpu_to_le32(RX_ATTENTION_FLAGS_FIRST_MPDU));
 870         is_last_ppdu = !!(rxd->attention.flags &
 871                           __cpu_to_le32(RX_ATTENTION_FLAGS_LAST_MPDU));
 872
 873         if (is_first_ppdu) {
 874                 /* New PPDU starts so clear out the old per-PPDU status. */
 875                 status->freq = 0;
 876                 status->rate_idx = 0;
 877                 status->nss = 0;
 878                 status->encoding = RX_ENC_LEGACY;
 879                 status->bw = RATE_INFO_BW_20;
 880                 status->flag &= ~RX_FLAG_MACTIME_END;
 881                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 882
 883                 ath10k_htt_rx_h_signal(ar, status, rxd);
 884                 ath10k_htt_rx_h_channel(ar, status, rxd, vdev_id);
 885                 ath10k_htt_rx_h_rates(ar, status, rxd);
 886         }
 887
 888         if (is_last_ppdu)
 889                 ath10k_htt_rx_h_mactime(ar, status, rxd);
 890 }
 891
 892 static const char * const tid_to_ac[] = {
 893         "BE",
 894         "BK",
 895         "BK",
 896         "BE",
 897         "VI",
 898         "VI",
 899         "VO",
 900         "VO",
 901 };
 902
 903 static char *ath10k_get_tid(struct ieee80211_hdr *hdr, char *out, size_t size)
 904 {
 905         u8 *qc;
 906         int tid;
 907
 908         if (!ieee80211_is_data_qos(hdr->frame_control))
 909                 return "";
 910
 911         qc = ieee80211_get_qos_ctl(hdr);
 912         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 913         if (tid < 8)
 914                 snprintf(out, size, "tid %d (%s)", tid, tid_to_ac[tid]);
 915         else
 916                 snprintf(out, size, "tid %d", tid);
 917
 918         return out;
 919 }
 920
 921 static void ath10k_process_rx(struct ath10k *ar,
 922                               struct ieee80211_rx_status *rx_status,
 923                               struct sk_buff *skb)
 924 {
 925         struct ieee80211_rx_status *status;
 926         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 927         char tid[32];
 928
 929         status = IEEE80211_SKB_RXCB(skb);
 930         *status = *rx_status;
 931
 932         ath10k_dbg(ar, ATH10K_DBG_DATA,
 933                    "rx skb %pK len %u peer %pM %s %s sn %u %s%s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u flag 0x%x fcs-err %i mic-err %i amsdu-more %i\n",
 934                    skb,
 935                    skb->len,
 936                    ieee80211_get_SA(hdr),
 937                    ath10k_get_tid(hdr, tid, sizeof(tid)),
 938                    is_multicast_ether_addr(ieee80211_get_DA(hdr)) ?
 939                                                         "mcast" : "ucast",
 940                    (__le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4,
 941                    (status->encoding == RX_ENC_LEGACY) ? "legacy" : "",
 942                    (status->encoding == RX_ENC_HT) ? "ht" : "",
 943                    (status->encoding == RX_ENC_VHT) ? "vht" : "",
 944                    (status->bw == RATE_INFO_BW_40) ? "40" : "",
 945                    (status->bw == RATE_INFO_BW_80) ? "80" : "",
 946                    (status->bw == RATE_INFO_BW_160) ? "160" : "",
 947                    status->enc_flags & RX_ENC_FLAG_SHORT_GI ? "sgi " : "",
 948                    status->rate_idx,
 949                    status->nss,
 950                    status->freq,
 951                    status->band, status->flag,
 952                    !!(status->flag & RX_FLAG_FAILED_FCS_CRC),
 953                    !!(status->flag & RX_FLAG_MMIC_ERROR),
 954                    !!(status->flag & RX_FLAG_AMSDU_MORE));
 955         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
 956                         skb->data, skb->len);
 957         trace_ath10k_rx_hdr(ar, skb->data, skb->len);
 958         trace_ath10k_rx_payload(ar, skb->data, skb->len);
 959
 960         ieee80211_rx_napi(ar->hw, NULL, skb, &ar->napi);
 961 }
 962
 963 static int ath10k_htt_rx_nwifi_hdrlen(struct ath10k *ar,
 964                                       struct ieee80211_hdr *hdr)
 965 {
 966         int len = ieee80211_hdrlen(hdr->frame_control);
 967
 968         if (!test_bit(ATH10K_FW_FEATURE_NO_NWIFI_DECAP_4ADDR_PADDING,
 969                       ar->running_fw->fw_file.fw_features))
 970                 len = round_up(len, 4);
 971
 972         return len;
 973 }
 974
 975 static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
 976                                         struct sk_buff *msdu,
 977                                         struct ieee80211_rx_status *status,
 978                                         enum htt_rx_mpdu_encrypt_type enctype,
 979                                         bool is_decrypted)
 980 {
 981         struct ieee80211_hdr *hdr;
 982         struct htt_rx_desc *rxd;
 983         size_t hdr_len;
 984         size_t crypto_len;
 985         bool is_first;
 986         bool is_last;
 987
 988         rxd = (void *)msdu->data - sizeof(*rxd);
 989         is_first = !!(rxd->msdu_end.common.info0 &
 990                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
 991         is_last = !!(rxd->msdu_end.common.info0 &
 992                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
 993
 994         /* Delivered decapped frame:
 995          * [802.11 header]
 996          * [crypto param] <-- can be trimmed if !fcs_err &&
 997          *                    !decrypt_err && !peer_idx_invalid
 998          * [amsdu header] <-- only if A-MSDU
 999          * [rfc1042/llc]
1000          * [payload]
1001          * [FCS] <-- at end, needs to be trimmed
1002          */
1003
1004         /* This probably shouldn't happen but warn just in case */
1005         if (unlikely(WARN_ON_ONCE(!is_first)))
1006                 return;
1007
1008         /* This probably shouldn't happen but warn just in case */
1009         if (unlikely(WARN_ON_ONCE(!(is_first && is_last))))
1010                 return;
1011
1012         skb_trim(msdu, msdu->len - FCS_LEN);
1013
1014         /* In most cases this will be true for sniffed frames. It makes sense
1015          * to deliver them as-is without stripping the crypto param. This is
1016          * necessary for software based decryption.
1017          *
1018          * If there's no error then the frame is decrypted. At least that is
1019          * the case for frames that come in via fragmented rx indication.
1020          */
1021         if (!is_decrypted)
1022                 return;
1023
1024         /* The payload is decrypted so strip crypto params. Start from tail
1025          * since hdr is used to compute some stuff.
1026          */
1027
1028         hdr = (void *)msdu->data;
1029
1030         /* Tail */
1031         if (status->flag & RX_FLAG_IV_STRIPPED)
1032                 skb_trim(msdu, msdu->len -
1033                          ath10k_htt_rx_crypto_tail_len(ar, enctype));
1034
1035         /* MMIC */
1036         if ((status->flag & RX_FLAG_MMIC_STRIPPED) &&
1037             !ieee80211_has_morefrags(hdr->frame_control) &&
1038             enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
1039                 skb_trim(msdu, msdu->len - 8);
1040
1041         /* Head */
1042         if (status->flag & RX_FLAG_IV_STRIPPED) {
1043                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1044                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1045
1046                 memmove((void *)msdu->data + crypto_len,
1047                         (void *)msdu->data, hdr_len);
1048                 skb_pull(msdu, crypto_len);
1049         }
1050 }
1051
1052 static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
1053                                           struct sk_buff *msdu,
1054                                           struct ieee80211_rx_status *status,
1055                                           const u8 first_hdr[64])
1056 {
1057         struct ieee80211_hdr *hdr;
1058         struct htt_rx_desc *rxd;
1059         size_t hdr_len;
1060         u8 da[ETH_ALEN];
1061         u8 sa[ETH_ALEN];
1062         int l3_pad_bytes;
1063
1064         /* Delivered decapped frame:
1065          * [nwifi 802.11 header] <-- replaced with 802.11 hdr
1066          * [rfc1042/llc]
1067          *
1068          * Note: The nwifi header doesn't have QoS Control and is
1069          * (always?) a 3addr frame.
1070          *
1071          * Note2: There's no A-MSDU subframe header. Even if it's part
1072          * of an A-MSDU.
1073          */
1074
1075         /* pull decapped header and copy SA & DA */
1076         rxd = (void *)msdu->data - sizeof(*rxd);
1077
1078         l3_pad_bytes = ath10k_rx_desc_get_l3_pad_bytes(&ar->hw_params, rxd);
1079         skb_put(msdu, l3_pad_bytes);
1080
1081         hdr = (struct ieee80211_hdr *)(msdu->data + l3_pad_bytes);
1082
1083         hdr_len = ath10k_htt_rx_nwifi_hdrlen(ar, hdr);
1084         ether_addr_copy(da, ieee80211_get_DA(hdr));
1085         ether_addr_copy(sa, ieee80211_get_SA(hdr));
1086         skb_pull(msdu, hdr_len);
1087
1088         /* push original 802.11 header */
1089         hdr = (struct ieee80211_hdr *)first_hdr;
1090         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1091         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1092
1093         /* original 802.11 header has a different DA and in
1094          * case of 4addr it may also have different SA
1095          */
1096         hdr = (struct ieee80211_hdr *)msdu->data;
1097         ether_addr_copy(ieee80211_get_DA(hdr), da);
1098         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1099 }
1100
1101 static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar,
1102                                           struct sk_buff *msdu,
1103                                           enum htt_rx_mpdu_encrypt_type enctype)
1104 {
1105         struct ieee80211_hdr *hdr;
1106         struct htt_rx_desc *rxd;
1107         size_t hdr_len, crypto_len;
1108         void *rfc1042;
1109         bool is_first, is_last, is_amsdu;
1110         int bytes_aligned = ar->hw_params.decap_align_bytes;
1111
1112         rxd = (void *)msdu->data - sizeof(*rxd);
1113         hdr = (void *)rxd->rx_hdr_status;
1114
1115         is_first = !!(rxd->msdu_end.common.info0 &
1116                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1117         is_last = !!(rxd->msdu_end.common.info0 &
1118                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
1119         is_amsdu = !(is_first && is_last);
1120
1121         rfc1042 = hdr;
1122
1123         if (is_first) {
1124                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1125                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1126
1127                 rfc1042 += round_up(hdr_len, bytes_aligned) +
1128                            round_up(crypto_len, bytes_aligned);
1129         }
1130
1131         if (is_amsdu)
1132                 rfc1042 += sizeof(struct amsdu_subframe_hdr);
1133
1134         return rfc1042;
1135 }
1136
1137 static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
1138                                         struct sk_buff *msdu,
1139                                         struct ieee80211_rx_status *status,
1140                                         const u8 first_hdr[64],
1141                                         enum htt_rx_mpdu_encrypt_type enctype)
1142 {
1143         struct ieee80211_hdr *hdr;
1144         struct ethhdr *eth;
1145         size_t hdr_len;
1146         void *rfc1042;
1147         u8 da[ETH_ALEN];
1148         u8 sa[ETH_ALEN];
1149         int l3_pad_bytes;
1150         struct htt_rx_desc *rxd;
1151
1152         /* Delivered decapped frame:
1153          * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
1154          * [payload]
1155          */
1156
1157         rfc1042 = ath10k_htt_rx_h_find_rfc1042(ar, msdu, enctype);
1158         if (WARN_ON_ONCE(!rfc1042))
1159                 return;
1160
1161         rxd = (void *)msdu->data - sizeof(*rxd);
1162         l3_pad_bytes = ath10k_rx_desc_get_l3_pad_bytes(&ar->hw_params, rxd);
1163         skb_put(msdu, l3_pad_bytes);
1164         skb_pull(msdu, l3_pad_bytes);
1165
1166         /* pull decapped header and copy SA & DA */
1167         eth = (struct ethhdr *)msdu->data;
1168         ether_addr_copy(da, eth->h_dest);
1169         ether_addr_copy(sa, eth->h_source);
1170         skb_pull(msdu, sizeof(struct ethhdr));
1171
1172         /* push rfc1042/llc/snap */
1173         memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042,
1174                sizeof(struct rfc1042_hdr));
1175
1176         /* push original 802.11 header */
1177         hdr = (struct ieee80211_hdr *)first_hdr;
1178         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1179         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1180
1181         /* original 802.11 header has a different DA and in
1182          * case of 4addr it may also have different SA
1183          */
1184         hdr = (struct ieee80211_hdr *)msdu->data;
1185         ether_addr_copy(ieee80211_get_DA(hdr), da);
1186         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1187 }
1188
1189 static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
1190                                          struct sk_buff *msdu,
1191                                          struct ieee80211_rx_status *status,
1192                                          const u8 first_hdr[64])
1193 {
1194         struct ieee80211_hdr *hdr;
1195         size_t hdr_len;
1196         int l3_pad_bytes;
1197         struct htt_rx_desc *rxd;
1198
1199         /* Delivered decapped frame:
1200          * [amsdu header] <-- replaced with 802.11 hdr
1201          * [rfc1042/llc]
1202          * [payload]
1203          */
1204
1205         rxd = (void *)msdu->data - sizeof(*rxd);
1206         l3_pad_bytes = ath10k_rx_desc_get_l3_pad_bytes(&ar->hw_params, rxd);
1207
1208         skb_put(msdu, l3_pad_bytes);
1209         skb_pull(msdu, sizeof(struct amsdu_subframe_hdr) + l3_pad_bytes);
1210
1211         hdr = (struct ieee80211_hdr *)first_hdr;
1212         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1213         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1214 }
1215
1216 static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
1217                                     struct sk_buff *msdu,
1218                                     struct ieee80211_rx_status *status,
1219                                     u8 first_hdr[64],
1220                                     enum htt_rx_mpdu_encrypt_type enctype,
1221                                     bool is_decrypted)
1222 {
1223         struct htt_rx_desc *rxd;
1224         enum rx_msdu_decap_format decap;
1225
1226         /* First msdu's decapped header:
1227          * [802.11 header] <-- padded to 4 bytes long
1228          * [crypto param] <-- padded to 4 bytes long
1229          * [amsdu header] <-- only if A-MSDU
1230          * [rfc1042/llc]
1231          *
1232          * Other (2nd, 3rd, ..) msdu's decapped header:
1233          * [amsdu header] <-- only if A-MSDU
1234          * [rfc1042/llc]
1235          */
1236
1237         rxd = (void *)msdu->data - sizeof(*rxd);
1238         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1239                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1240
1241         switch (decap) {
1242         case RX_MSDU_DECAP_RAW:
1243                 ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype,
1244                                             is_decrypted);
1245                 break;
1246         case RX_MSDU_DECAP_NATIVE_WIFI:
1247                 ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
1248                 break;
1249         case RX_MSDU_DECAP_ETHERNET2_DIX:
1250                 ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
1251                 break;
1252         case RX_MSDU_DECAP_8023_SNAP_LLC:
1253                 ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
1254                 break;
1255         }
1256 }
1257
1258 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
1259 {
1260         struct htt_rx_desc *rxd;
1261         u32 flags, info;
1262         bool is_ip4, is_ip6;
1263         bool is_tcp, is_udp;
1264         bool ip_csum_ok, tcpudp_csum_ok;
1265
1266         rxd = (void *)skb->data - sizeof(*rxd);
1267         flags = __le32_to_cpu(rxd->attention.flags);
1268         info = __le32_to_cpu(rxd->msdu_start.common.info1);
1269
1270         is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
1271         is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
1272         is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
1273         is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
1274         ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
1275         tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);
1276
1277         if (!is_ip4 && !is_ip6)
1278                 return CHECKSUM_NONE;
1279         if (!is_tcp && !is_udp)
1280                 return CHECKSUM_NONE;
1281         if (!ip_csum_ok)
1282                 return CHECKSUM_NONE;
1283         if (!tcpudp_csum_ok)
1284                 return CHECKSUM_NONE;
1285
1286         return CHECKSUM_UNNECESSARY;
1287 }
1288
1289 static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
1290 {
1291         msdu->ip_summed = ath10k_htt_rx_get_csum_state(msdu);
1292 }
1293
1294 static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
1295                                  struct sk_buff_head *amsdu,
1296                                  struct ieee80211_rx_status *status)
1297 {
1298         struct sk_buff *first;
1299         struct sk_buff *last;
1300         struct sk_buff *msdu;
1301         struct htt_rx_desc *rxd;
1302         struct ieee80211_hdr *hdr;
1303         enum htt_rx_mpdu_encrypt_type enctype;
1304         u8 first_hdr[64];
1305         u8 *qos;
1306         size_t hdr_len;
1307         bool has_fcs_err;
1308         bool has_crypto_err;
1309         bool has_tkip_err;
1310         bool has_peer_idx_invalid;
1311         bool is_decrypted;
1312         bool is_mgmt;
1313         u32 attention;
1314
1315         if (skb_queue_empty(amsdu))
1316                 return;
1317
1318         first = skb_peek(amsdu);
1319         rxd = (void *)first->data - sizeof(*rxd);
1320
1321         is_mgmt = !!(rxd->attention.flags &
1322                      __cpu_to_le32(RX_ATTENTION_FLAGS_MGMT_TYPE));
1323
1324         enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
1325                      RX_MPDU_START_INFO0_ENCRYPT_TYPE);
1326
1327         /* First MSDU's Rx descriptor in an A-MSDU contains full 802.11
1328          * decapped header. It'll be used for undecapping of each MSDU.
1329          */
1330         hdr = (void *)rxd->rx_hdr_status;
1331         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1332         memcpy(first_hdr, hdr, hdr_len);
1333
1334         /* Each A-MSDU subframe will use the original header as the base and be
1335          * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
1336          */
1337         hdr = (void *)first_hdr;
1338         qos = ieee80211_get_qos_ctl(hdr);
1339         qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
1340
1341         /* Some attention flags are valid only in the last MSDU. */
1342         last = skb_peek_tail(amsdu);
1343         rxd = (void *)last->data - sizeof(*rxd);
1344         attention = __le32_to_cpu(rxd->attention.flags);
1345
1346         has_fcs_err = !!(attention & RX_ATTENTION_FLAGS_FCS_ERR);
1347         has_crypto_err = !!(attention & RX_ATTENTION_FLAGS_DECRYPT_ERR);
1348         has_tkip_err = !!(attention & RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
1349         has_peer_idx_invalid = !!(attention & RX_ATTENTION_FLAGS_PEER_IDX_INVALID);
1350
1351         /* Note: If hardware captures an encrypted frame that it can't decrypt,
1352          * e.g. due to fcs error, missing peer or invalid key data it will
1353          * report the frame as raw.
1354          */
1355         is_decrypted = (enctype != HTT_RX_MPDU_ENCRYPT_NONE &&
1356                         !has_fcs_err &&
1357                         !has_crypto_err &&
1358                         !has_peer_idx_invalid);
1359
1360         /* Clear per-MPDU flags while leaving per-PPDU flags intact. */
1361         status->flag &= ~(RX_FLAG_FAILED_FCS_CRC |
1362                           RX_FLAG_MMIC_ERROR |
1363                           RX_FLAG_DECRYPTED |
1364                           RX_FLAG_IV_STRIPPED |
1365                           RX_FLAG_ONLY_MONITOR |
1366                           RX_FLAG_MMIC_STRIPPED);
1367
1368         if (has_fcs_err)
1369                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
1370
1371         if (has_tkip_err)
1372                 status->flag |= RX_FLAG_MMIC_ERROR;
1373
1374         /* Firmware reports all necessary management frames via WMI already.
1375          * They are not reported to monitor interfaces at all so pass the ones
1376          * coming via HTT to monitor interfaces instead. This simplifies
1377          * matters a lot.
1378          */
1379         if (is_mgmt)
1380                 status->flag |= RX_FLAG_ONLY_MONITOR;
1381
1382         if (is_decrypted) {
1383                 status->flag |= RX_FLAG_DECRYPTED;
1384
1385                 if (likely(!is_mgmt))
1386                         status->flag |= RX_FLAG_IV_STRIPPED |
1387                                         RX_FLAG_MMIC_STRIPPED;
1388 }
1389
1390         skb_queue_walk(amsdu, msdu) {
1391                 ath10k_htt_rx_h_csum_offload(msdu);
1392                 ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
1393                                         is_decrypted);
1394
1395                 /* Undecapping involves copying the original 802.11 header back
1396                  * to sk_buff. If frame is protected and hardware has decrypted
1397                  * it then remove the protected bit.
1398                  */
1399                 if (!is_decrypted)
1400                         continue;
1401                 if (is_mgmt)
1402                         continue;
1403
1404                 hdr = (void *)msdu->data;
1405                 hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1406         }
1407 }
1408
1409 static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
1410                                     struct sk_buff_head *amsdu,
1411                                     struct ieee80211_rx_status *status)
1412 {
1413         struct sk_buff *msdu;
1414
1415         while ((msdu = __skb_dequeue(amsdu))) {
1416                 /* Setup per-MSDU flags */
1417                 if (skb_queue_empty(amsdu))
1418                         status->flag &= ~RX_FLAG_AMSDU_MORE;
1419                 else
1420                         status->flag |= RX_FLAG_AMSDU_MORE;
1421
1422                 ath10k_process_rx(ar, status, msdu);
1423         }
1424 }
1425
1426 static int ath10k_unchain_msdu(struct sk_buff_head *amsdu)
1427 {
1428         struct sk_buff *skb, *first;
1429         int space;
1430         int total_len = 0;
1431
1432         /* TODO:  Might could optimize this by using
1433          * skb_try_coalesce or similar method to
1434          * decrease copying, or maybe get mac80211 to
1435          * provide a way to just receive a list of
1436          * skb?
1437          */
1438
1439         first = __skb_dequeue(amsdu);
1440
1441         /* Allocate total length all at once. */
1442         skb_queue_walk(amsdu, skb)
1443                 total_len += skb->len;
1444
1445         space = total_len - skb_tailroom(first);
1446         if ((space > 0) &&
1447             (pskb_expand_head(first, 0, space, GFP_ATOMIC) < 0)) {
1448                 /* TODO:  bump some rx-oom error stat */
1449                 /* put it back together so we can free the
1450                  * whole list at once.
1451                  */
1452                 __skb_queue_head(amsdu, first);
1453                 return -1;
1454         }
1455
1456         /* Walk list again, copying contents into
1457          * msdu_head
1458          */
1459         while ((skb = __skb_dequeue(amsdu))) {
1460                 skb_copy_from_linear_data(skb, skb_put(first, skb->len),
1461                                           skb->len);
1462                 dev_kfree_skb_any(skb);
1463         }
1464
1465         __skb_queue_head(amsdu, first);
1466         return 0;
1467 }
1468
1469 static void ath10k_htt_rx_h_unchain(struct ath10k *ar,
1470                                     struct sk_buff_head *amsdu)
1471 {
1472         struct sk_buff *first;
1473         struct htt_rx_desc *rxd;
1474         enum rx_msdu_decap_format decap;
1475
1476         first = skb_peek(amsdu);
1477         rxd = (void *)first->data - sizeof(*rxd);
1478         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1479                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1480
1481         /* FIXME: Current unchaining logic can only handle simple case of raw
1482          * msdu chaining. If decapping is other than raw the chaining may be
1483          * more complex and this isn't handled by the current code. Don't even
1484          * try re-constructing such frames - it'll be pretty much garbage.
1485          */
1486         if (decap != RX_MSDU_DECAP_RAW ||
1487             skb_queue_len(amsdu) != 1 + rxd->frag_info.ring2_more_count) {
1488                 __skb_queue_purge(amsdu);
1489                 return;
1490         }
1491
1492         ath10k_unchain_msdu(amsdu);
1493 }
1494
1495 static bool ath10k_htt_rx_amsdu_allowed(struct ath10k *ar,
1496                                         struct sk_buff_head *amsdu,
1497                                         struct ieee80211_rx_status *rx_status)
1498 {
1499         /* FIXME: It might be a good idea to do some fuzzy-testing to drop
1500          * invalid/dangerous frames.
1501          */
1502
1503         if (!rx_status->freq) {
1504                 ath10k_warn(ar, "no channel configured; ignoring frame(s)!\n");
1505                 return false;
1506         }
1507
1508         if (test_bit(ATH10K_CAC_RUNNING, &ar->dev_flags)) {
1509                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx cac running\n");
1510                 return false;
1511         }
1512
1513         return true;
1514 }
1515
1516 static void ath10k_htt_rx_h_filter(struct ath10k *ar,
1517                                    struct sk_buff_head *amsdu,
1518                                    struct ieee80211_rx_status *rx_status)
1519 {
1520         if (skb_queue_empty(amsdu))
1521                 return;
1522
1523         if (ath10k_htt_rx_amsdu_allowed(ar, amsdu, rx_status))
1524                 return;
1525
1526         __skb_queue_purge(amsdu);
1527 }
1528
1529 static int ath10k_htt_rx_handle_amsdu(struct ath10k_htt *htt)
1530 {
1531         struct ath10k *ar = htt->ar;
1532         struct ieee80211_rx_status *rx_status = &htt->rx_status;
1533         struct sk_buff_head amsdu;
1534         int ret, num_msdus;
1535
1536         __skb_queue_head_init(&amsdu);
1537
1538         spin_lock_bh(&htt->rx_ring.lock);
1539         if (htt->rx_confused) {
1540                 spin_unlock_bh(&htt->rx_ring.lock);
1541                 return -EIO;
1542         }
1543         ret = ath10k_htt_rx_amsdu_pop(htt, &amsdu);
1544         spin_unlock_bh(&htt->rx_ring.lock);
1545
1546         if (ret < 0) {
1547                 ath10k_warn(ar, "rx ring became corrupted: %d\n", ret);
1548                 __skb_queue_purge(&amsdu);
1549                 /* FIXME: It's probably a good idea to reboot the
1550                  * device instead of leaving it inoperable.
1551                  */
1552                 htt->rx_confused = true;
1553                 return ret;
1554         }
1555
1556         num_msdus = skb_queue_len(&amsdu);
1557         ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status, 0xffff);
1558
1559         /* only for ret = 1 indicates chained msdus */
1560         if (ret > 0)
1561                 ath10k_htt_rx_h_unchain(ar, &amsdu);
1562
1563         ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
1564         ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
1565         ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1566
1567         return num_msdus;
1568 }
1569
1570 static void ath10k_htt_rx_proc_rx_ind(struct ath10k_htt *htt,
1571                                       struct htt_rx_indication *rx)
1572 {
1573         struct ath10k *ar = htt->ar;
1574         struct htt_rx_indication_mpdu_range *mpdu_ranges;
1575         int num_mpdu_ranges;
1576         int i, mpdu_count = 0;
1577
1578         num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
1579                              HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
1580         mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
1581
1582         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
1583                         rx, sizeof(*rx) +
1584                         (sizeof(struct htt_rx_indication_mpdu_range) *
1585                                 num_mpdu_ranges));
1586
1587         for (i = 0; i < num_mpdu_ranges; i++)
1588                 mpdu_count += mpdu_ranges[i].mpdu_count;
1589
1590         atomic_add(mpdu_count, &htt->num_mpdus_ready);
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 int 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         int num_msdu = 0;
1784
1785         while ((msdu = __skb_dequeue(list))) {
1786                 /* Offloaded frames don't have Rx descriptor. Instead they have
1787                  * a short meta information header.
1788                  */
1789
1790                 rx = (void *)msdu->data;
1791
1792                 skb_put(msdu, sizeof(*rx));
1793                 skb_pull(msdu, sizeof(*rx));
1794
1795                 if (skb_tailroom(msdu) < __le16_to_cpu(rx->msdu_len)) {
1796                         ath10k_warn(ar, "dropping frame: offloaded rx msdu is too long!\n");
1797                         dev_kfree_skb_any(msdu);
1798                         continue;
1799                 }
1800
1801                 skb_put(msdu, __le16_to_cpu(rx->msdu_len));
1802
1803                 /* Offloaded rx header length isn't multiple of 2 nor 4 so the
1804                  * actual payload is unaligned. Align the frame.  Otherwise
1805                  * mac80211 complains.  This shouldn't reduce performance much
1806                  * because these offloaded frames are rare.
1807                  */
1808                 offset = 4 - ((unsigned long)msdu->data & 3);
1809                 skb_put(msdu, offset);
1810                 memmove(msdu->data + offset, msdu->data, msdu->len);
1811                 skb_pull(msdu, offset);
1812
1813                 /* FIXME: The frame is NWifi. Re-construct QoS Control
1814                  * if possible later.
1815                  */
1816
1817                 memset(status, 0, sizeof(*status));
1818                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
1819
1820                 ath10k_htt_rx_h_rx_offload_prot(status, msdu);
1821                 ath10k_htt_rx_h_channel(ar, status, NULL, rx->vdev_id);
1822                 ath10k_process_rx(ar, status, msdu);
1823                 num_msdu++;
1824         }
1825         return num_msdu;
1826 }
1827
1828 static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
1829 {
1830         struct ath10k_htt *htt = &ar->htt;
1831         struct htt_resp *resp = (void *)skb->data;
1832         struct ieee80211_rx_status *status = &htt->rx_status;
1833         struct sk_buff_head list;
1834         struct sk_buff_head amsdu;
1835         u16 peer_id;
1836         u16 msdu_count;
1837         u8 vdev_id;
1838         u8 tid;
1839         bool offload;
1840         bool frag;
1841         int ret, num_msdus = 0;
1842
1843         lockdep_assert_held(&htt->rx_ring.lock);
1844
1845         if (htt->rx_confused)
1846                 return -EIO;
1847
1848         skb_pull(skb, sizeof(resp->hdr));
1849         skb_pull(skb, sizeof(resp->rx_in_ord_ind));
1850
1851         peer_id = __le16_to_cpu(resp->rx_in_ord_ind.peer_id);
1852         msdu_count = __le16_to_cpu(resp->rx_in_ord_ind.msdu_count);
1853         vdev_id = resp->rx_in_ord_ind.vdev_id;
1854         tid = SM(resp->rx_in_ord_ind.info, HTT_RX_IN_ORD_IND_INFO_TID);
1855         offload = !!(resp->rx_in_ord_ind.info &
1856                         HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
1857         frag = !!(resp->rx_in_ord_ind.info & HTT_RX_IN_ORD_IND_INFO_FRAG_MASK);
1858
1859         ath10k_dbg(ar, ATH10K_DBG_HTT,
1860                    "htt rx in ord vdev %i peer %i tid %i offload %i frag %i msdu count %i\n",
1861                    vdev_id, peer_id, tid, offload, frag, msdu_count);
1862
1863         if (skb->len < msdu_count * sizeof(*resp->rx_in_ord_ind.msdu_descs)) {
1864                 ath10k_warn(ar, "dropping invalid in order rx indication\n");
1865                 return -EINVAL;
1866         }
1867
1868         /* The event can deliver more than 1 A-MSDU. Each A-MSDU is later
1869          * extracted and processed.
1870          */
1871         __skb_queue_head_init(&list);
1872         ret = ath10k_htt_rx_pop_paddr_list(htt, &resp->rx_in_ord_ind, &list);
1873         if (ret < 0) {
1874                 ath10k_warn(ar, "failed to pop paddr list: %d\n", ret);
1875                 htt->rx_confused = true;
1876                 return -EIO;
1877         }
1878
1879         /* Offloaded frames are very different and need to be handled
1880          * separately.
1881          */
1882         if (offload)
1883                 num_msdus = ath10k_htt_rx_h_rx_offload(ar, &list);
1884
1885         while (!skb_queue_empty(&list)) {
1886                 __skb_queue_head_init(&amsdu);
1887                 ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
1888                 switch (ret) {
1889                 case 0:
1890                         /* Note: The in-order indication may report interleaved
1891                          * frames from different PPDUs meaning reported rx rate
1892                          * to mac80211 isn't accurate/reliable. It's still
1893                          * better to report something than nothing though. This
1894                          * should still give an idea about rx rate to the user.
1895                          */
1896                         num_msdus += skb_queue_len(&amsdu);
1897                         ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
1898                         ath10k_htt_rx_h_filter(ar, &amsdu, status);
1899                         ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
1900                         ath10k_htt_rx_h_deliver(ar, &amsdu, status);
1901                         break;
1902                 case -EAGAIN:
1903                         /* fall through */
1904                 default:
1905                         /* Should not happen. */
1906                         ath10k_warn(ar, "failed to extract amsdu: %d\n", ret);
1907                         htt->rx_confused = true;
1908                         __skb_queue_purge(&list);
1909                         return -EIO;
1910                 }
1911         }
1912         return num_msdus;
1913 }
1914
1915 static void ath10k_htt_rx_tx_fetch_resp_id_confirm(struct ath10k *ar,
1916                                                    const __le32 *resp_ids,
1917                                                    int num_resp_ids)
1918 {
1919         int i;
1920         u32 resp_id;
1921
1922         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm num_resp_ids %d\n",
1923                    num_resp_ids);
1924
1925         for (i = 0; i < num_resp_ids; i++) {
1926                 resp_id = le32_to_cpu(resp_ids[i]);
1927
1928                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm resp_id %u\n",
1929                            resp_id);
1930
1931                 /* TODO: free resp_id */
1932         }
1933 }
1934
1935 static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
1936 {
1937         struct ieee80211_hw *hw = ar->hw;
1938         struct ieee80211_txq *txq;
1939         struct htt_resp *resp = (struct htt_resp *)skb->data;
1940         struct htt_tx_fetch_record *record;
1941         size_t len;
1942         size_t max_num_bytes;
1943         size_t max_num_msdus;
1944         size_t num_bytes;
1945         size_t num_msdus;
1946         const __le32 *resp_ids;
1947         u16 num_records;
1948         u16 num_resp_ids;
1949         u16 peer_id;
1950         u8 tid;
1951         int ret;
1952         int i;
1953
1954         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind\n");
1955
1956         len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_ind);
1957         if (unlikely(skb->len < len)) {
1958                 ath10k_warn(ar, "received corrupted tx_fetch_ind event: buffer too short\n");
1959                 return;
1960         }
1961
1962         num_records = le16_to_cpu(resp->tx_fetch_ind.num_records);
1963         num_resp_ids = le16_to_cpu(resp->tx_fetch_ind.num_resp_ids);
1964
1965         len += sizeof(resp->tx_fetch_ind.records[0]) * num_records;
1966         len += sizeof(resp->tx_fetch_ind.resp_ids[0]) * num_resp_ids;
1967
1968         if (unlikely(skb->len < len)) {
1969                 ath10k_warn(ar, "received corrupted tx_fetch_ind event: too many records/resp_ids\n");
1970                 return;
1971         }
1972
1973         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind num records %hu num resps %hu seq %hu\n",
1974                    num_records, num_resp_ids,
1975                    le16_to_cpu(resp->tx_fetch_ind.fetch_seq_num));
1976
1977         if (!ar->htt.tx_q_state.enabled) {
1978                 ath10k_warn(ar, "received unexpected tx_fetch_ind event: not enabled\n");
1979                 return;
1980         }
1981
1982         if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH) {
1983                 ath10k_warn(ar, "received unexpected tx_fetch_ind event: in push mode\n");
1984                 return;
1985         }
1986
1987         rcu_read_lock();
1988
1989         for (i = 0; i < num_records; i++) {
1990                 record = &resp->tx_fetch_ind.records[i];
1991                 peer_id = MS(le16_to_cpu(record->info),
1992                              HTT_TX_FETCH_RECORD_INFO_PEER_ID);
1993                 tid = MS(le16_to_cpu(record->info),
1994                          HTT_TX_FETCH_RECORD_INFO_TID);
1995                 max_num_msdus = le16_to_cpu(record->num_msdus);
1996                 max_num_bytes = le32_to_cpu(record->num_bytes);
1997
1998                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch record %i peer_id %hu tid %hhu msdus %zu bytes %zu\n",
1999                            i, peer_id, tid, max_num_msdus, max_num_bytes);
2000
2001                 if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
2002                     unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
2003                         ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
2004                                     peer_id, tid);
2005                         continue;
2006                 }
2007
2008                 spin_lock_bh(&ar->data_lock);
2009                 txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
2010                 spin_unlock_bh(&ar->data_lock);
2011
2012                 /* It is okay to release the lock and use txq because RCU read
2013                  * lock is held.
2014                  */
2015
2016                 if (unlikely(!txq)) {
2017                         ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
2018                                     peer_id, tid);
2019                         continue;
2020                 }
2021
2022                 num_msdus = 0;
2023                 num_bytes = 0;
2024
2025                 while (num_msdus < max_num_msdus &&
2026                        num_bytes < max_num_bytes) {
2027                         ret = ath10k_mac_tx_push_txq(hw, txq);
2028                         if (ret < 0)
2029                                 break;
2030
2031                         num_msdus++;
2032                         num_bytes += ret;
2033                 }
2034
2035                 record->num_msdus = cpu_to_le16(num_msdus);
2036                 record->num_bytes = cpu_to_le32(num_bytes);
2037
2038                 ath10k_htt_tx_txq_recalc(hw, txq);
2039         }
2040
2041         rcu_read_unlock();
2042
2043         resp_ids = ath10k_htt_get_tx_fetch_ind_resp_ids(&resp->tx_fetch_ind);
2044         ath10k_htt_rx_tx_fetch_resp_id_confirm(ar, resp_ids, num_resp_ids);
2045
2046         ret = ath10k_htt_tx_fetch_resp(ar,
2047                                        resp->tx_fetch_ind.token,
2048                                        resp->tx_fetch_ind.fetch_seq_num,
2049                                        resp->tx_fetch_ind.records,
2050                                        num_records);
2051         if (unlikely(ret)) {
2052                 ath10k_warn(ar, "failed to submit tx fetch resp for token 0x%08x: %d\n",
2053                             le32_to_cpu(resp->tx_fetch_ind.token), ret);
2054                 /* FIXME: request fw restart */
2055         }
2056
2057         ath10k_htt_tx_txq_sync(ar);
2058 }
2059
2060 static void ath10k_htt_rx_tx_fetch_confirm(struct ath10k *ar,
2061                                            struct sk_buff *skb)
2062 {
2063         const struct htt_resp *resp = (void *)skb->data;
2064         size_t len;
2065         int num_resp_ids;
2066
2067         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm\n");
2068
2069         len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_confirm);
2070         if (unlikely(skb->len < len)) {
2071                 ath10k_warn(ar, "received corrupted tx_fetch_confirm event: buffer too short\n");
2072                 return;
2073         }
2074
2075         num_resp_ids = le16_to_cpu(resp->tx_fetch_confirm.num_resp_ids);
2076         len += sizeof(resp->tx_fetch_confirm.resp_ids[0]) * num_resp_ids;
2077
2078         if (unlikely(skb->len < len)) {
2079                 ath10k_warn(ar, "received corrupted tx_fetch_confirm event: resp_ids buffer overflow\n");
2080                 return;
2081         }
2082
2083         ath10k_htt_rx_tx_fetch_resp_id_confirm(ar,
2084                                                resp->tx_fetch_confirm.resp_ids,
2085                                                num_resp_ids);
2086 }
2087
2088 static void ath10k_htt_rx_tx_mode_switch_ind(struct ath10k *ar,
2089                                              struct sk_buff *skb)
2090 {
2091         const struct htt_resp *resp = (void *)skb->data;
2092         const struct htt_tx_mode_switch_record *record;
2093         struct ieee80211_txq *txq;
2094         struct ath10k_txq *artxq;
2095         size_t len;
2096         size_t num_records;
2097         enum htt_tx_mode_switch_mode mode;
2098         bool enable;
2099         u16 info0;
2100         u16 info1;
2101         u16 threshold;
2102         u16 peer_id;
2103         u8 tid;
2104         int i;
2105
2106         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx mode switch ind\n");
2107
2108         len = sizeof(resp->hdr) + sizeof(resp->tx_mode_switch_ind);
2109         if (unlikely(skb->len < len)) {
2110                 ath10k_warn(ar, "received corrupted tx_mode_switch_ind event: buffer too short\n");
2111                 return;
2112         }
2113
2114         info0 = le16_to_cpu(resp->tx_mode_switch_ind.info0);
2115         info1 = le16_to_cpu(resp->tx_mode_switch_ind.info1);
2116
2117         enable = !!(info0 & HTT_TX_MODE_SWITCH_IND_INFO0_ENABLE);
2118         num_records = MS(info0, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);
2119         mode = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_MODE);
2120         threshold = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);
2121
2122         ath10k_dbg(ar, ATH10K_DBG_HTT,
2123                    "htt rx tx mode switch ind info0 0x%04hx info1 0x%04hx enable %d num records %zd mode %d threshold %hu\n",
2124                    info0, info1, enable, num_records, mode, threshold);
2125
2126         len += sizeof(resp->tx_mode_switch_ind.records[0]) * num_records;
2127
2128         if (unlikely(skb->len < len)) {
2129                 ath10k_warn(ar, "received corrupted tx_mode_switch_mode_ind event: too many records\n");
2130                 return;
2131         }
2132
2133         switch (mode) {
2134         case HTT_TX_MODE_SWITCH_PUSH:
2135         case HTT_TX_MODE_SWITCH_PUSH_PULL:
2136                 break;
2137         default:
2138                 ath10k_warn(ar, "received invalid tx_mode_switch_mode_ind mode %d, ignoring\n",
2139                             mode);
2140                 return;
2141         }
2142
2143         if (!enable)
2144                 return;
2145
2146         ar->htt.tx_q_state.enabled = enable;
2147         ar->htt.tx_q_state.mode = mode;
2148         ar->htt.tx_q_state.num_push_allowed = threshold;
2149
2150         rcu_read_lock();
2151
2152         for (i = 0; i < num_records; i++) {
2153                 record = &resp->tx_mode_switch_ind.records[i];
2154                 info0 = le16_to_cpu(record->info0);
2155                 peer_id = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_PEER_ID);
2156                 tid = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_TID);
2157
2158                 if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
2159                     unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
2160                         ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
2161                                     peer_id, tid);
2162                         continue;
2163                 }
2164
2165                 spin_lock_bh(&ar->data_lock);
2166                 txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
2167                 spin_unlock_bh(&ar->data_lock);
2168
2169                 /* It is okay to release the lock and use txq because RCU read
2170                  * lock is held.
2171                  */
2172
2173                 if (unlikely(!txq)) {
2174                         ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
2175                                     peer_id, tid);
2176                         continue;
2177                 }
2178
2179                 spin_lock_bh(&ar->htt.tx_lock);
2180                 artxq = (void *)txq->drv_priv;
2181                 artxq->num_push_allowed = le16_to_cpu(record->num_max_msdus);
2182                 spin_unlock_bh(&ar->htt.tx_lock);
2183         }
2184
2185         rcu_read_unlock();
2186
2187         ath10k_mac_tx_push_pending(ar);
2188 }
2189
2190 void ath10k_htt_htc_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
2191 {
2192         bool release;
2193
2194         release = ath10k_htt_t2h_msg_handler(ar, skb);
2195
2196         /* Free the indication buffer */
2197         if (release)
2198                 dev_kfree_skb_any(skb);
2199 }
2200
2201 static inline bool is_valid_legacy_rate(u8 rate)
2202 {
2203         static const u8 legacy_rates[] = {1, 2, 5, 11, 6, 9, 12,
2204                                           18, 24, 36, 48, 54};
2205         int i;
2206
2207         for (i = 0; i < ARRAY_SIZE(legacy_rates); i++) {
2208                 if (rate == legacy_rates[i])
2209                         return true;
2210         }
2211
2212         return false;
2213 }
2214
2215 static void
2216 ath10k_update_per_peer_tx_stats(struct ath10k *ar,
2217                                 struct ieee80211_sta *sta,
2218                                 struct ath10k_per_peer_tx_stats *peer_stats)
2219 {
2220         struct ath10k_sta *arsta = (struct ath10k_sta *)sta->drv_priv;
2221         u8 rate = 0, sgi;
2222         struct rate_info txrate;
2223
2224         lockdep_assert_held(&ar->data_lock);
2225
2226         txrate.flags = ATH10K_HW_PREAMBLE(peer_stats->ratecode);
2227         txrate.bw = ATH10K_HW_BW(peer_stats->flags);
2228         txrate.nss = ATH10K_HW_NSS(peer_stats->ratecode);
2229         txrate.mcs = ATH10K_HW_MCS_RATE(peer_stats->ratecode);
2230         sgi = ATH10K_HW_GI(peer_stats->flags);
2231
2232         if (((txrate.flags == WMI_RATE_PREAMBLE_HT) ||
2233              (txrate.flags == WMI_RATE_PREAMBLE_VHT)) && txrate.mcs > 9) {
2234                 ath10k_warn(ar, "Invalid mcs %hhd peer stats", txrate.mcs);
2235                 return;
2236         }
2237
2238         memset(&arsta->txrate, 0, sizeof(arsta->txrate));
2239
2240         if (txrate.flags == WMI_RATE_PREAMBLE_CCK ||
2241             txrate.flags == WMI_RATE_PREAMBLE_OFDM) {
2242                 rate = ATH10K_HW_LEGACY_RATE(peer_stats->ratecode);
2243
2244                 if (!is_valid_legacy_rate(rate)) {
2245                         ath10k_warn(ar, "Invalid legacy rate %hhd peer stats",
2246                                     rate);
2247                         return;
2248                 }
2249
2250                 /* This is hacky, FW sends CCK rate 5.5Mbps as 6 */
2251                 rate *= 10;
2252                 if (rate == 60 && txrate.flags == WMI_RATE_PREAMBLE_CCK)
2253                         rate = rate - 5;
2254                 arsta->txrate.legacy = rate;
2255         } else if (txrate.flags == WMI_RATE_PREAMBLE_HT) {
2256                 arsta->txrate.flags = RATE_INFO_FLAGS_MCS;
2257                 arsta->txrate.mcs = txrate.mcs;
2258         } else {
2259                 arsta->txrate.flags = RATE_INFO_FLAGS_VHT_MCS;
2260                 arsta->txrate.mcs = txrate.mcs;
2261         }
2262
2263         if (sgi)
2264                 arsta->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
2265
2266         arsta->txrate.nss = txrate.nss;
2267         arsta->txrate.bw = txrate.bw + RATE_INFO_BW_20;
2268 }
2269
2270 static void ath10k_htt_fetch_peer_stats(struct ath10k *ar,
2271                                         struct sk_buff *skb)
2272 {
2273         struct htt_resp *resp = (struct htt_resp *)skb->data;
2274         struct ath10k_per_peer_tx_stats *p_tx_stats = &ar->peer_tx_stats;
2275         struct htt_per_peer_tx_stats_ind *tx_stats;
2276         struct ieee80211_sta *sta;
2277         struct ath10k_peer *peer;
2278         int peer_id, i;
2279         u8 ppdu_len, num_ppdu;
2280
2281         num_ppdu = resp->peer_tx_stats.num_ppdu;
2282         ppdu_len = resp->peer_tx_stats.ppdu_len * sizeof(__le32);
2283
2284         if (skb->len < sizeof(struct htt_resp_hdr) + num_ppdu * ppdu_len) {
2285                 ath10k_warn(ar, "Invalid peer stats buf length %d\n", skb->len);
2286                 return;
2287         }
2288
2289         tx_stats = (struct htt_per_peer_tx_stats_ind *)
2290                         (resp->peer_tx_stats.payload);
2291         peer_id = __le16_to_cpu(tx_stats->peer_id);
2292
2293         rcu_read_lock();
2294         spin_lock_bh(&ar->data_lock);
2295         peer = ath10k_peer_find_by_id(ar, peer_id);
2296         if (!peer) {
2297                 ath10k_warn(ar, "Invalid peer id %d peer stats buffer\n",
2298                             peer_id);
2299                 goto out;
2300         }
2301
2302         sta = peer->sta;
2303         for (i = 0; i < num_ppdu; i++) {
2304                 tx_stats = (struct htt_per_peer_tx_stats_ind *)
2305                            (resp->peer_tx_stats.payload + i * ppdu_len);
2306
2307                 p_tx_stats->succ_bytes = __le32_to_cpu(tx_stats->succ_bytes);
2308                 p_tx_stats->retry_bytes = __le32_to_cpu(tx_stats->retry_bytes);
2309                 p_tx_stats->failed_bytes =
2310                                 __le32_to_cpu(tx_stats->failed_bytes);
2311                 p_tx_stats->ratecode = tx_stats->ratecode;
2312                 p_tx_stats->flags = tx_stats->flags;
2313                 p_tx_stats->succ_pkts = __le16_to_cpu(tx_stats->succ_pkts);
2314                 p_tx_stats->retry_pkts = __le16_to_cpu(tx_stats->retry_pkts);
2315                 p_tx_stats->failed_pkts = __le16_to_cpu(tx_stats->failed_pkts);
2316
2317                 ath10k_update_per_peer_tx_stats(ar, sta, p_tx_stats);
2318         }
2319
2320 out:
2321         spin_unlock_bh(&ar->data_lock);
2322         rcu_read_unlock();
2323 }
2324
2325 bool ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
2326 {
2327         struct ath10k_htt *htt = &ar->htt;
2328         struct htt_resp *resp = (struct htt_resp *)skb->data;
2329         enum htt_t2h_msg_type type;
2330
2331         /* confirm alignment */
2332         if (!IS_ALIGNED((unsigned long)skb->data, 4))
2333                 ath10k_warn(ar, "unaligned htt message, expect trouble\n");
2334
2335         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, msg_type: 0x%0X\n",
2336                    resp->hdr.msg_type);
2337
2338         if (resp->hdr.msg_type >= ar->htt.t2h_msg_types_max) {
2339                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, unsupported msg_type: 0x%0X\n max: 0x%0X",
2340                            resp->hdr.msg_type, ar->htt.t2h_msg_types_max);
2341                 return true;
2342         }
2343         type = ar->htt.t2h_msg_types[resp->hdr.msg_type];
2344
2345         switch (type) {
2346         case HTT_T2H_MSG_TYPE_VERSION_CONF: {
2347                 htt->target_version_major = resp->ver_resp.major;
2348                 htt->target_version_minor = resp->ver_resp.minor;
2349                 complete(&htt->target_version_received);
2350                 break;
2351         }
2352         case HTT_T2H_MSG_TYPE_RX_IND:
2353                 ath10k_htt_rx_proc_rx_ind(htt, &resp->rx_ind);
2354                 break;
2355         case HTT_T2H_MSG_TYPE_PEER_MAP: {
2356                 struct htt_peer_map_event ev = {
2357                         .vdev_id = resp->peer_map.vdev_id,
2358                         .peer_id = __le16_to_cpu(resp->peer_map.peer_id),
2359                 };
2360                 memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
2361                 ath10k_peer_map_event(htt, &ev);
2362                 break;
2363         }
2364         case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
2365                 struct htt_peer_unmap_event ev = {
2366                         .peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
2367                 };
2368                 ath10k_peer_unmap_event(htt, &ev);
2369                 break;
2370         }
2371         case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
2372                 struct htt_tx_done tx_done = {};
2373                 int status = __le32_to_cpu(resp->mgmt_tx_completion.status);
2374
2375                 tx_done.msdu_id = __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
2376
2377                 switch (status) {
2378                 case HTT_MGMT_TX_STATUS_OK:
2379                         tx_done.status = HTT_TX_COMPL_STATE_ACK;
2380                         break;
2381                 case HTT_MGMT_TX_STATUS_RETRY:
2382                         tx_done.status = HTT_TX_COMPL_STATE_NOACK;
2383                         break;
2384                 case HTT_MGMT_TX_STATUS_DROP:
2385                         tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
2386                         break;
2387                 }
2388
2389                 status = ath10k_txrx_tx_unref(htt, &tx_done);
2390                 if (!status) {
2391                         spin_lock_bh(&htt->tx_lock);
2392                         ath10k_htt_tx_mgmt_dec_pending(htt);
2393                         spin_unlock_bh(&htt->tx_lock);
2394                 }
2395                 break;
2396         }
2397         case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
2398                 ath10k_htt_rx_tx_compl_ind(htt->ar, skb);
2399                 break;
2400         case HTT_T2H_MSG_TYPE_SEC_IND: {
2401                 struct ath10k *ar = htt->ar;
2402                 struct htt_security_indication *ev = &resp->security_indication;
2403
2404                 ath10k_dbg(ar, ATH10K_DBG_HTT,
2405                            "sec ind peer_id %d unicast %d type %d\n",
2406                           __le16_to_cpu(ev->peer_id),
2407                           !!(ev->flags & HTT_SECURITY_IS_UNICAST),
2408                           MS(ev->flags, HTT_SECURITY_TYPE));
2409                 complete(&ar->install_key_done);
2410                 break;
2411         }
2412         case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
2413                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2414                                 skb->data, skb->len);
2415                 atomic_inc(&htt->num_mpdus_ready);
2416                 break;
2417         }
2418         case HTT_T2H_MSG_TYPE_TEST:
2419                 break;
2420         case HTT_T2H_MSG_TYPE_STATS_CONF:
2421                 trace_ath10k_htt_stats(ar, skb->data, skb->len);
2422                 break;
2423         case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
2424                 /* Firmware can return tx frames if it's unable to fully
2425                  * process them and suspects host may be able to fix it. ath10k
2426                  * sends all tx frames as already inspected so this shouldn't
2427                  * happen unless fw has a bug.
2428                  */
2429                 ath10k_warn(ar, "received an unexpected htt tx inspect event\n");
2430                 break;
2431         case HTT_T2H_MSG_TYPE_RX_ADDBA:
2432                 ath10k_htt_rx_addba(ar, resp);
2433                 break;
2434         case HTT_T2H_MSG_TYPE_RX_DELBA:
2435                 ath10k_htt_rx_delba(ar, resp);
2436                 break;
2437         case HTT_T2H_MSG_TYPE_PKTLOG: {
2438                 trace_ath10k_htt_pktlog(ar, resp->pktlog_msg.payload,
2439                                         skb->len -
2440                                         offsetof(struct htt_resp,
2441                                                  pktlog_msg.payload));
2442                 break;
2443         }
2444         case HTT_T2H_MSG_TYPE_RX_FLUSH: {
2445                 /* Ignore this event because mac80211 takes care of Rx
2446                  * aggregation reordering.
2447                  */
2448                 break;
2449         }
2450         case HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND: {
2451                 __skb_queue_tail(&htt->rx_in_ord_compl_q, skb);
2452                 return false;
2453         }
2454         case HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND:
2455                 break;
2456         case HTT_T2H_MSG_TYPE_CHAN_CHANGE: {
2457                 u32 phymode = __le32_to_cpu(resp->chan_change.phymode);
2458                 u32 freq = __le32_to_cpu(resp->chan_change.freq);
2459
2460                 ar->tgt_oper_chan = ieee80211_get_channel(ar->hw->wiphy, freq);
2461                 ath10k_dbg(ar, ATH10K_DBG_HTT,
2462                            "htt chan change freq %u phymode %s\n",
2463                            freq, ath10k_wmi_phymode_str(phymode));
2464                 break;
2465         }
2466         case HTT_T2H_MSG_TYPE_AGGR_CONF:
2467                 break;
2468         case HTT_T2H_MSG_TYPE_TX_FETCH_IND: {
2469                 struct sk_buff *tx_fetch_ind = skb_copy(skb, GFP_ATOMIC);
2470
2471                 if (!tx_fetch_ind) {
2472                         ath10k_warn(ar, "failed to copy htt tx fetch ind\n");
2473                         break;
2474                 }
2475                 skb_queue_tail(&htt->tx_fetch_ind_q, tx_fetch_ind);
2476                 break;
2477         }
2478         case HTT_T2H_MSG_TYPE_TX_FETCH_CONFIRM:
2479                 ath10k_htt_rx_tx_fetch_confirm(ar, skb);
2480                 break;
2481         case HTT_T2H_MSG_TYPE_TX_MODE_SWITCH_IND:
2482                 ath10k_htt_rx_tx_mode_switch_ind(ar, skb);
2483                 break;
2484         case HTT_T2H_MSG_TYPE_PEER_STATS:
2485                 ath10k_htt_fetch_peer_stats(ar, skb);
2486                 break;
2487         case HTT_T2H_MSG_TYPE_EN_STATS:
2488         default:
2489                 ath10k_warn(ar, "htt event (%d) not handled\n",
2490                             resp->hdr.msg_type);
2491                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2492                                 skb->data, skb->len);
2493                 break;
2494         }
2495         return true;
2496 }
2497 EXPORT_SYMBOL(ath10k_htt_t2h_msg_handler);
2498
2499 void ath10k_htt_rx_pktlog_completion_handler(struct ath10k *ar,
2500                                              struct sk_buff *skb)
2501 {
2502         trace_ath10k_htt_pktlog(ar, skb->data, skb->len);
2503         dev_kfree_skb_any(skb);
2504 }
2505 EXPORT_SYMBOL(ath10k_htt_rx_pktlog_completion_handler);
2506
2507 int ath10k_htt_txrx_compl_task(struct ath10k *ar, int budget)
2508 {
2509         struct ath10k_htt *htt = &ar->htt;
2510         struct htt_tx_done tx_done = {};
2511         struct sk_buff_head tx_ind_q;
2512         struct sk_buff *skb;
2513         unsigned long flags;
2514         int quota = 0, done, num_rx_msdus;
2515         bool resched_napi = false;
2516
2517         __skb_queue_head_init(&tx_ind_q);
2518
2519         /* Since in-ord-ind can deliver more than 1 A-MSDU in single event,
2520          * process it first to utilize full available quota.
2521          */
2522         while (quota < budget) {
2523                 if (skb_queue_empty(&htt->rx_in_ord_compl_q))
2524                         break;
2525
2526                 skb = __skb_dequeue(&htt->rx_in_ord_compl_q);
2527                 if (!skb) {
2528                         resched_napi = true;
2529                         goto exit;
2530                 }
2531
2532                 spin_lock_bh(&htt->rx_ring.lock);
2533                 num_rx_msdus = ath10k_htt_rx_in_ord_ind(ar, skb);
2534                 spin_unlock_bh(&htt->rx_ring.lock);
2535                 if (num_rx_msdus < 0) {
2536                         resched_napi = true;
2537                         goto exit;
2538                 }
2539
2540                 dev_kfree_skb_any(skb);
2541                 if (num_rx_msdus > 0)
2542                         quota += num_rx_msdus;
2543
2544                 if ((quota > ATH10K_NAPI_QUOTA_LIMIT) &&
2545                     !skb_queue_empty(&htt->rx_in_ord_compl_q)) {
2546                         resched_napi = true;
2547                         goto exit;
2548                 }
2549         }
2550
2551         while (quota < budget) {
2552                 /* no more data to receive */
2553                 if (!atomic_read(&htt->num_mpdus_ready))
2554                         break;
2555
2556                 num_rx_msdus = ath10k_htt_rx_handle_amsdu(htt);
2557                 if (num_rx_msdus < 0) {
2558                         resched_napi = true;
2559                         goto exit;
2560                 }
2561
2562                 quota += num_rx_msdus;
2563                 atomic_dec(&htt->num_mpdus_ready);
2564                 if ((quota > ATH10K_NAPI_QUOTA_LIMIT) &&
2565                     atomic_read(&htt->num_mpdus_ready)) {
2566                         resched_napi = true;
2567                         goto exit;
2568                 }
2569         }
2570
2571         /* From NAPI documentation:
2572          *  The napi poll() function may also process TX completions, in which
2573          *  case if it processes the entire TX ring then it should count that
2574          *  work as the rest of the budget.
2575          */
2576         if ((quota < budget) && !kfifo_is_empty(&htt->txdone_fifo))
2577                 quota = budget;
2578
2579         /* kfifo_get: called only within txrx_tasklet so it's neatly serialized.
2580          * From kfifo_get() documentation:
2581          *  Note that with only one concurrent reader and one concurrent writer,
2582          *  you don't need extra locking to use these macro.
2583          */
2584         while (kfifo_get(&htt->txdone_fifo, &tx_done))
2585                 ath10k_txrx_tx_unref(htt, &tx_done);
2586
2587         ath10k_mac_tx_push_pending(ar);
2588
2589         spin_lock_irqsave(&htt->tx_fetch_ind_q.lock, flags);
2590         skb_queue_splice_init(&htt->tx_fetch_ind_q, &tx_ind_q);
2591         spin_unlock_irqrestore(&htt->tx_fetch_ind_q.lock, flags);
2592
2593         while ((skb = __skb_dequeue(&tx_ind_q))) {
2594                 ath10k_htt_rx_tx_fetch_ind(ar, skb);
2595                 dev_kfree_skb_any(skb);
2596         }
2597
2598 exit:
2599         ath10k_htt_rx_msdu_buff_replenish(htt);
2600         /* In case of rx failure or more data to read, report budget
2601          * to reschedule NAPI poll
2602          */
2603         done = resched_napi ? budget : quota;
2604
2605         return done;
2606 }
2607 EXPORT_SYMBOL(ath10k_htt_txrx_compl_task);