kernel/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 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb);
  35 static void ath10k_htt_txrx_compl_task(unsigned long ptr);
  36
  37 static struct sk_buff *
  38 ath10k_htt_rx_find_skb_paddr(struct ath10k *ar, u32 paddr)
  39 {
  40         struct ath10k_skb_rxcb *rxcb;
  41
  42         hash_for_each_possible(ar->htt.rx_ring.skb_table, rxcb, hlist, paddr)
  43                 if (rxcb->paddr == paddr)
  44                         return ATH10K_RXCB_SKB(rxcb);
  45
  46         WARN_ON_ONCE(1);
  47         return NULL;
  48 }
  49
  50 static void ath10k_htt_rx_ring_free(struct ath10k_htt *htt)
  51 {
  52         struct sk_buff *skb;
  53         struct ath10k_skb_rxcb *rxcb;
  54         struct hlist_node *n;
  55         int i;
  56
  57         if (htt->rx_ring.in_ord_rx) {
  58                 hash_for_each_safe(htt->rx_ring.skb_table, i, n, rxcb, hlist) {
  59                         skb = ATH10K_RXCB_SKB(rxcb);
  60                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  61                                          skb->len + skb_tailroom(skb),
  62                                          DMA_FROM_DEVICE);
  63                         hash_del(&rxcb->hlist);
  64                         dev_kfree_skb_any(skb);
  65                 }
  66         } else {
  67                 for (i = 0; i < htt->rx_ring.size; i++) {
  68                         skb = htt->rx_ring.netbufs_ring[i];
  69                         if (!skb)
  70                                 continue;
  71
  72                         rxcb = ATH10K_SKB_RXCB(skb);
  73                         dma_unmap_single(htt->ar->dev, rxcb->paddr,
  74                                          skb->len + skb_tailroom(skb),
  75                                          DMA_FROM_DEVICE);
  76                         dev_kfree_skb_any(skb);
  77                 }
  78         }
  79
  80         htt->rx_ring.fill_cnt = 0;
  81         hash_init(htt->rx_ring.skb_table);
  82         memset(htt->rx_ring.netbufs_ring, 0,
  83                htt->rx_ring.size * sizeof(htt->rx_ring.netbufs_ring[0]));
  84 }
  85
  86 static int __ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
  87 {
  88         struct htt_rx_desc *rx_desc;
  89         struct ath10k_skb_rxcb *rxcb;
  90         struct sk_buff *skb;
  91         dma_addr_t paddr;
  92         int ret = 0, idx;
  93
  94         /* The Full Rx Reorder firmware has no way of telling the host
  95          * implicitly when it copied HTT Rx Ring buffers to MAC Rx Ring.
  96          * To keep things simple make sure ring is always half empty. This
  97          * guarantees there'll be no replenishment overruns possible.
  98          */
  99         BUILD_BUG_ON(HTT_RX_RING_FILL_LEVEL >= HTT_RX_RING_SIZE / 2);
 100
 101         idx = __le32_to_cpu(*htt->rx_ring.alloc_idx.vaddr);
 102         while (num > 0) {
 103                 skb = dev_alloc_skb(HTT_RX_BUF_SIZE + HTT_RX_DESC_ALIGN);
 104                 if (!skb) {
 105                         ret = -ENOMEM;
 106                         goto fail;
 107                 }
 108
 109                 if (!IS_ALIGNED((unsigned long)skb->data, HTT_RX_DESC_ALIGN))
 110                         skb_pull(skb,
 111                                  PTR_ALIGN(skb->data, HTT_RX_DESC_ALIGN) -
 112                                  skb->data);
 113
 114                 /* Clear rx_desc attention word before posting to Rx ring */
 115                 rx_desc = (struct htt_rx_desc *)skb->data;
 116                 rx_desc->attention.flags = __cpu_to_le32(0);
 117
 118                 paddr = dma_map_single(htt->ar->dev, skb->data,
 119                                        skb->len + skb_tailroom(skb),
 120                                        DMA_FROM_DEVICE);
 121
 122                 if (unlikely(dma_mapping_error(htt->ar->dev, paddr))) {
 123                         dev_kfree_skb_any(skb);
 124                         ret = -ENOMEM;
 125                         goto fail;
 126                 }
 127
 128                 rxcb = ATH10K_SKB_RXCB(skb);
 129                 rxcb->paddr = paddr;
 130                 htt->rx_ring.netbufs_ring[idx] = skb;
 131                 htt->rx_ring.paddrs_ring[idx] = __cpu_to_le32(paddr);
 132                 htt->rx_ring.fill_cnt++;
 133
 134                 if (htt->rx_ring.in_ord_rx) {
 135                         hash_add(htt->rx_ring.skb_table,
 136                                  &ATH10K_SKB_RXCB(skb)->hlist,
 137                                  (u32)paddr);
 138                 }
 139
 140                 num--;
 141                 idx++;
 142                 idx &= htt->rx_ring.size_mask;
 143         }
 144
 145 fail:
 146         /*
 147          * Make sure the rx buffer is updated before available buffer
 148          * index to avoid any potential rx ring corruption.
 149          */
 150         mb();
 151         *htt->rx_ring.alloc_idx.vaddr = __cpu_to_le32(idx);
 152         return ret;
 153 }
 154
 155 static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
 156 {
 157         lockdep_assert_held(&htt->rx_ring.lock);
 158         return __ath10k_htt_rx_ring_fill_n(htt, num);
 159 }
 160
 161 static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
 162 {
 163         int ret, num_deficit, num_to_fill;
 164
 165         /* Refilling the whole RX ring buffer proves to be a bad idea. The
 166          * reason is RX may take up significant amount of CPU cycles and starve
 167          * other tasks, e.g. TX on an ethernet device while acting as a bridge
 168          * with ath10k wlan interface. This ended up with very poor performance
 169          * once CPU the host system was overwhelmed with RX on ath10k.
 170          *
 171          * By limiting the number of refills the replenishing occurs
 172          * progressively. This in turns makes use of the fact tasklets are
 173          * processed in FIFO order. This means actual RX processing can starve
 174          * out refilling. If there's not enough buffers on RX ring FW will not
 175          * report RX until it is refilled with enough buffers. This
 176          * automatically balances load wrt to CPU power.
 177          *
 178          * This probably comes at a cost of lower maximum throughput but
 179          * improves the average and stability. */
 180         spin_lock_bh(&htt->rx_ring.lock);
 181         num_deficit = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
 182         num_to_fill = min(ATH10K_HTT_MAX_NUM_REFILL, num_deficit);
 183         num_deficit -= num_to_fill;
 184         ret = ath10k_htt_rx_ring_fill_n(htt, num_to_fill);
 185         if (ret == -ENOMEM) {
 186                 /*
 187                  * Failed to fill it to the desired level -
 188                  * we'll start a timer and try again next time.
 189                  * As long as enough buffers are left in the ring for
 190                  * another A-MPDU rx, no special recovery is needed.
 191                  */
 192                 mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
 193                           msecs_to_jiffies(HTT_RX_RING_REFILL_RETRY_MS));
 194         } else if (num_deficit > 0) {
 195                 tasklet_schedule(&htt->rx_replenish_task);
 196         }
 197         spin_unlock_bh(&htt->rx_ring.lock);
 198 }
 199
 200 static void ath10k_htt_rx_ring_refill_retry(unsigned long arg)
 201 {
 202         struct ath10k_htt *htt = (struct ath10k_htt *)arg;
 203
 204         ath10k_htt_rx_msdu_buff_replenish(htt);
 205 }
 206
 207 int ath10k_htt_rx_ring_refill(struct ath10k *ar)
 208 {
 209         struct ath10k_htt *htt = &ar->htt;
 210         int ret;
 211
 212         spin_lock_bh(&htt->rx_ring.lock);
 213         ret = ath10k_htt_rx_ring_fill_n(htt, (htt->rx_ring.fill_level -
 214                                               htt->rx_ring.fill_cnt));
 215         spin_unlock_bh(&htt->rx_ring.lock);
 216
 217         if (ret)
 218                 ath10k_htt_rx_ring_free(htt);
 219
 220         return ret;
 221 }
 222
 223 void ath10k_htt_rx_free(struct ath10k_htt *htt)
 224 {
 225         del_timer_sync(&htt->rx_ring.refill_retry_timer);
 226         tasklet_kill(&htt->rx_replenish_task);
 227         tasklet_kill(&htt->txrx_compl_task);
 228
 229         skb_queue_purge(&htt->tx_compl_q);
 230         skb_queue_purge(&htt->rx_compl_q);
 231         skb_queue_purge(&htt->rx_in_ord_compl_q);
 232
 233         ath10k_htt_rx_ring_free(htt);
 234
 235         dma_free_coherent(htt->ar->dev,
 236                           (htt->rx_ring.size *
 237                            sizeof(htt->rx_ring.paddrs_ring)),
 238                           htt->rx_ring.paddrs_ring,
 239                           htt->rx_ring.base_paddr);
 240
 241         dma_free_coherent(htt->ar->dev,
 242                           sizeof(*htt->rx_ring.alloc_idx.vaddr),
 243                           htt->rx_ring.alloc_idx.vaddr,
 244                           htt->rx_ring.alloc_idx.paddr);
 245
 246         kfree(htt->rx_ring.netbufs_ring);
 247 }
 248
 249 static inline struct sk_buff *ath10k_htt_rx_netbuf_pop(struct ath10k_htt *htt)
 250 {
 251         struct ath10k *ar = htt->ar;
 252         int idx;
 253         struct sk_buff *msdu;
 254
 255         lockdep_assert_held(&htt->rx_ring.lock);
 256
 257         if (htt->rx_ring.fill_cnt == 0) {
 258                 ath10k_warn(ar, "tried to pop sk_buff from an empty rx ring\n");
 259                 return NULL;
 260         }
 261
 262         idx = htt->rx_ring.sw_rd_idx.msdu_payld;
 263         msdu = htt->rx_ring.netbufs_ring[idx];
 264         htt->rx_ring.netbufs_ring[idx] = NULL;
 265         htt->rx_ring.paddrs_ring[idx] = 0;
 266
 267         idx++;
 268         idx &= htt->rx_ring.size_mask;
 269         htt->rx_ring.sw_rd_idx.msdu_payld = idx;
 270         htt->rx_ring.fill_cnt--;
 271
 272         dma_unmap_single(htt->ar->dev,
 273                          ATH10K_SKB_RXCB(msdu)->paddr,
 274                          msdu->len + skb_tailroom(msdu),
 275                          DMA_FROM_DEVICE);
 276         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
 277                         msdu->data, msdu->len + skb_tailroom(msdu));
 278
 279         return msdu;
 280 }
 281
 282 /* return: < 0 fatal error, 0 - non chained msdu, 1 chained msdu */
 283 static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
 284                                    u8 **fw_desc, int *fw_desc_len,
 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                 skb_put(msdu, offsetof(struct htt_rx_desc, msdu_payload));
 310                 skb_pull(msdu, offsetof(struct htt_rx_desc, msdu_payload));
 311
 312                 /*
 313                  * Sanity check - confirm the HW is finished filling in the
 314                  * rx data.
 315                  * If the HW and SW are working correctly, then it's guaranteed
 316                  * that the HW's MAC DMA is done before this point in the SW.
 317                  * To prevent the case that we handle a stale Rx descriptor,
 318                  * just assert for now until we have a way to recover.
 319                  */
 320                 if (!(__le32_to_cpu(rx_desc->attention.flags)
 321                                 & RX_ATTENTION_FLAGS_MSDU_DONE)) {
 322                         __skb_queue_purge(amsdu);
 323                         return -EIO;
 324                 }
 325
 326                 /*
 327                  * Copy the FW rx descriptor for this MSDU from the rx
 328                  * indication message into the MSDU's netbuf. HL uses the
 329                  * same rx indication message definition as LL, and simply
 330                  * appends new info (fields from the HW rx desc, and the
 331                  * MSDU payload itself). So, the offset into the rx
 332                  * indication message only has to account for the standard
 333                  * offset of the per-MSDU FW rx desc info within the
 334                  * message, and how many bytes of the per-MSDU FW rx desc
 335                  * info have already been consumed. (And the endianness of
 336                  * the host, since for a big-endian host, the rx ind
 337                  * message contents, including the per-MSDU rx desc bytes,
 338                  * were byteswapped during upload.)
 339                  */
 340                 if (*fw_desc_len > 0) {
 341                         rx_desc->fw_desc.info0 = **fw_desc;
 342                         /*
 343                          * The target is expected to only provide the basic
 344                          * per-MSDU rx descriptors. Just to be sure, verify
 345                          * that the target has not attached extension data
 346                          * (e.g. LRO flow ID).
 347                          */
 348
 349                         /* or more, if there's extension data */
 350                         (*fw_desc)++;
 351                         (*fw_desc_len)--;
 352                 } else {
 353                         /*
 354                          * When an oversized AMSDU happened, FW will lost
 355                          * some of MSDU status - in this case, the FW
 356                          * descriptors provided will be less than the
 357                          * actual MSDUs inside this MPDU. Mark the FW
 358                          * descriptors so that it will still deliver to
 359                          * upper stack, if no CRC error for this MPDU.
 360                          *
 361                          * FIX THIS - the FW descriptors are actually for
 362                          * MSDUs in the end of this A-MSDU instead of the
 363                          * beginning.
 364                          */
 365                         rx_desc->fw_desc.info0 = 0;
 366                 }
 367
 368                 msdu_len_invalid = !!(__le32_to_cpu(rx_desc->attention.flags)
 369                                         & (RX_ATTENTION_FLAGS_MPDU_LENGTH_ERR |
 370                                            RX_ATTENTION_FLAGS_MSDU_LENGTH_ERR));
 371                 msdu_len = MS(__le32_to_cpu(rx_desc->msdu_start.info0),
 372                               RX_MSDU_START_INFO0_MSDU_LENGTH);
 373                 msdu_chained = rx_desc->frag_info.ring2_more_count;
 374
 375                 if (msdu_len_invalid)
 376                         msdu_len = 0;
 377
 378                 skb_trim(msdu, 0);
 379                 skb_put(msdu, min(msdu_len, HTT_RX_MSDU_SIZE));
 380                 msdu_len -= msdu->len;
 381
 382                 /* Note: Chained buffers do not contain rx descriptor */
 383                 while (msdu_chained--) {
 384                         msdu = ath10k_htt_rx_netbuf_pop(htt);
 385                         if (!msdu) {
 386                                 __skb_queue_purge(amsdu);
 387                                 return -ENOENT;
 388                         }
 389
 390                         __skb_queue_tail(amsdu, msdu);
 391                         skb_trim(msdu, 0);
 392                         skb_put(msdu, min(msdu_len, HTT_RX_BUF_SIZE));
 393                         msdu_len -= msdu->len;
 394                         msdu_chaining = 1;
 395                 }
 396
 397                 last_msdu = __le32_to_cpu(rx_desc->msdu_end.info0) &
 398                                 RX_MSDU_END_INFO0_LAST_MSDU;
 399
 400                 trace_ath10k_htt_rx_desc(ar, &rx_desc->attention,
 401                                          sizeof(*rx_desc) - sizeof(u32));
 402
 403                 if (last_msdu)
 404                         break;
 405         }
 406
 407         if (skb_queue_empty(amsdu))
 408                 msdu_chaining = -1;
 409
 410         /*
 411          * Don't refill the ring yet.
 412          *
 413          * First, the elements popped here are still in use - it is not
 414          * safe to overwrite them until the matching call to
 415          * mpdu_desc_list_next. Second, for efficiency it is preferable to
 416          * refill the rx ring with 1 PPDU's worth of rx buffers (something
 417          * like 32 x 3 buffers), rather than one MPDU's worth of rx buffers
 418          * (something like 3 buffers). Consequently, we'll rely on the txrx
 419          * SW to tell us when it is done pulling all the PPDU's rx buffers
 420          * out of the rx ring, and then refill it just once.
 421          */
 422
 423         return msdu_chaining;
 424 }
 425
 426 static void ath10k_htt_rx_replenish_task(unsigned long ptr)
 427 {
 428         struct ath10k_htt *htt = (struct ath10k_htt *)ptr;
 429
 430         ath10k_htt_rx_msdu_buff_replenish(htt);
 431 }
 432
 433 static struct sk_buff *ath10k_htt_rx_pop_paddr(struct ath10k_htt *htt,
 434                                                u32 paddr)
 435 {
 436         struct ath10k *ar = htt->ar;
 437         struct ath10k_skb_rxcb *rxcb;
 438         struct sk_buff *msdu;
 439
 440         lockdep_assert_held(&htt->rx_ring.lock);
 441
 442         msdu = ath10k_htt_rx_find_skb_paddr(ar, paddr);
 443         if (!msdu)
 444                 return NULL;
 445
 446         rxcb = ATH10K_SKB_RXCB(msdu);
 447         hash_del(&rxcb->hlist);
 448         htt->rx_ring.fill_cnt--;
 449
 450         dma_unmap_single(htt->ar->dev, rxcb->paddr,
 451                          msdu->len + skb_tailroom(msdu),
 452                          DMA_FROM_DEVICE);
 453         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
 454                         msdu->data, msdu->len + skb_tailroom(msdu));
 455
 456         return msdu;
 457 }
 458
 459 static int ath10k_htt_rx_pop_paddr_list(struct ath10k_htt *htt,
 460                                         struct htt_rx_in_ord_ind *ev,
 461                                         struct sk_buff_head *list)
 462 {
 463         struct ath10k *ar = htt->ar;
 464         struct htt_rx_in_ord_msdu_desc *msdu_desc = ev->msdu_descs;
 465         struct htt_rx_desc *rxd;
 466         struct sk_buff *msdu;
 467         int msdu_count;
 468         bool is_offload;
 469         u32 paddr;
 470
 471         lockdep_assert_held(&htt->rx_ring.lock);
 472
 473         msdu_count = __le16_to_cpu(ev->msdu_count);
 474         is_offload = !!(ev->info & HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
 475
 476         while (msdu_count--) {
 477                 paddr = __le32_to_cpu(msdu_desc->msdu_paddr);
 478
 479                 msdu = ath10k_htt_rx_pop_paddr(htt, paddr);
 480                 if (!msdu) {
 481                         __skb_queue_purge(list);
 482                         return -ENOENT;
 483                 }
 484
 485                 __skb_queue_tail(list, msdu);
 486
 487                 if (!is_offload) {
 488                         rxd = (void *)msdu->data;
 489
 490                         trace_ath10k_htt_rx_desc(ar, rxd, sizeof(*rxd));
 491
 492                         skb_put(msdu, sizeof(*rxd));
 493                         skb_pull(msdu, sizeof(*rxd));
 494                         skb_put(msdu, __le16_to_cpu(msdu_desc->msdu_len));
 495
 496                         if (!(__le32_to_cpu(rxd->attention.flags) &
 497                               RX_ATTENTION_FLAGS_MSDU_DONE)) {
 498                                 ath10k_warn(htt->ar, "tried to pop an incomplete frame, oops!\n");
 499                                 return -EIO;
 500                         }
 501                 }
 502
 503                 msdu_desc++;
 504         }
 505
 506         return 0;
 507 }
 508
 509 int ath10k_htt_rx_alloc(struct ath10k_htt *htt)
 510 {
 511         struct ath10k *ar = htt->ar;
 512         dma_addr_t paddr;
 513         void *vaddr;
 514         size_t size;
 515         struct timer_list *timer = &htt->rx_ring.refill_retry_timer;
 516
 517         htt->rx_confused = false;
 518
 519         /* XXX: The fill level could be changed during runtime in response to
 520          * the host processing latency. Is this really worth it?
 521          */
 522         htt->rx_ring.size = HTT_RX_RING_SIZE;
 523         htt->rx_ring.size_mask = htt->rx_ring.size - 1;
 524         htt->rx_ring.fill_level = HTT_RX_RING_FILL_LEVEL;
 525
 526         if (!is_power_of_2(htt->rx_ring.size)) {
 527                 ath10k_warn(ar, "htt rx ring size is not power of 2\n");
 528                 return -EINVAL;
 529         }
 530
 531         htt->rx_ring.netbufs_ring =
 532                 kzalloc(htt->rx_ring.size * sizeof(struct sk_buff *),
 533                         GFP_KERNEL);
 534         if (!htt->rx_ring.netbufs_ring)
 535                 goto err_netbuf;
 536
 537         size = htt->rx_ring.size * sizeof(htt->rx_ring.paddrs_ring);
 538
 539         vaddr = dma_alloc_coherent(htt->ar->dev, size, &paddr, GFP_DMA);
 540         if (!vaddr)
 541                 goto err_dma_ring;
 542
 543         htt->rx_ring.paddrs_ring = vaddr;
 544         htt->rx_ring.base_paddr = paddr;
 545
 546         vaddr = dma_alloc_coherent(htt->ar->dev,
 547                                    sizeof(*htt->rx_ring.alloc_idx.vaddr),
 548                                    &paddr, GFP_DMA);
 549         if (!vaddr)
 550                 goto err_dma_idx;
 551
 552         htt->rx_ring.alloc_idx.vaddr = vaddr;
 553         htt->rx_ring.alloc_idx.paddr = paddr;
 554         htt->rx_ring.sw_rd_idx.msdu_payld = htt->rx_ring.size_mask;
 555         *htt->rx_ring.alloc_idx.vaddr = 0;
 556
 557         /* Initialize the Rx refill retry timer */
 558         setup_timer(timer, ath10k_htt_rx_ring_refill_retry, (unsigned long)htt);
 559
 560         spin_lock_init(&htt->rx_ring.lock);
 561
 562         htt->rx_ring.fill_cnt = 0;
 563         htt->rx_ring.sw_rd_idx.msdu_payld = 0;
 564         hash_init(htt->rx_ring.skb_table);
 565
 566         tasklet_init(&htt->rx_replenish_task, ath10k_htt_rx_replenish_task,
 567                      (unsigned long)htt);
 568
 569         skb_queue_head_init(&htt->tx_compl_q);
 570         skb_queue_head_init(&htt->rx_compl_q);
 571         skb_queue_head_init(&htt->rx_in_ord_compl_q);
 572
 573         tasklet_init(&htt->txrx_compl_task, ath10k_htt_txrx_compl_task,
 574                      (unsigned long)htt);
 575
 576         ath10k_dbg(ar, ATH10K_DBG_BOOT, "htt rx ring size %d fill_level %d\n",
 577                    htt->rx_ring.size, htt->rx_ring.fill_level);
 578         return 0;
 579
 580 err_dma_idx:
 581         dma_free_coherent(htt->ar->dev,
 582                           (htt->rx_ring.size *
 583                            sizeof(htt->rx_ring.paddrs_ring)),
 584                           htt->rx_ring.paddrs_ring,
 585                           htt->rx_ring.base_paddr);
 586 err_dma_ring:
 587         kfree(htt->rx_ring.netbufs_ring);
 588 err_netbuf:
 589         return -ENOMEM;
 590 }
 591
 592 static int ath10k_htt_rx_crypto_param_len(struct ath10k *ar,
 593                                           enum htt_rx_mpdu_encrypt_type type)
 594 {
 595         switch (type) {
 596         case HTT_RX_MPDU_ENCRYPT_NONE:
 597                 return 0;
 598         case HTT_RX_MPDU_ENCRYPT_WEP40:
 599         case HTT_RX_MPDU_ENCRYPT_WEP104:
 600                 return IEEE80211_WEP_IV_LEN;
 601         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 602         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 603                 return IEEE80211_TKIP_IV_LEN;
 604         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 605                 return IEEE80211_CCMP_HDR_LEN;
 606         case HTT_RX_MPDU_ENCRYPT_WEP128:
 607         case HTT_RX_MPDU_ENCRYPT_WAPI:
 608                 break;
 609         }
 610
 611         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 612         return 0;
 613 }
 614
 615 #define MICHAEL_MIC_LEN 8
 616
 617 static int ath10k_htt_rx_crypto_tail_len(struct ath10k *ar,
 618                                          enum htt_rx_mpdu_encrypt_type type)
 619 {
 620         switch (type) {
 621         case HTT_RX_MPDU_ENCRYPT_NONE:
 622                 return 0;
 623         case HTT_RX_MPDU_ENCRYPT_WEP40:
 624         case HTT_RX_MPDU_ENCRYPT_WEP104:
 625                 return IEEE80211_WEP_ICV_LEN;
 626         case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
 627         case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
 628                 return IEEE80211_TKIP_ICV_LEN;
 629         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
 630                 return IEEE80211_CCMP_MIC_LEN;
 631         case HTT_RX_MPDU_ENCRYPT_WEP128:
 632         case HTT_RX_MPDU_ENCRYPT_WAPI:
 633                 break;
 634         }
 635
 636         ath10k_warn(ar, "unsupported encryption type %d\n", type);
 637         return 0;
 638 }
 639
 640 struct rfc1042_hdr {
 641         u8 llc_dsap;
 642         u8 llc_ssap;
 643         u8 llc_ctrl;
 644         u8 snap_oui[3];
 645         __be16 snap_type;
 646 } __packed;
 647
 648 struct amsdu_subframe_hdr {
 649         u8 dst[ETH_ALEN];
 650         u8 src[ETH_ALEN];
 651         __be16 len;
 652 } __packed;
 653
 654 static const u8 rx_legacy_rate_idx[] = {
 655         3,      /* 0x00  - 11Mbps  */
 656         2,      /* 0x01  - 5.5Mbps */
 657         1,      /* 0x02  - 2Mbps   */
 658         0,      /* 0x03  - 1Mbps   */
 659         3,      /* 0x04  - 11Mbps  */
 660         2,      /* 0x05  - 5.5Mbps */
 661         1,      /* 0x06  - 2Mbps   */
 662         0,      /* 0x07  - 1Mbps   */
 663         10,     /* 0x08  - 48Mbps  */
 664         8,      /* 0x09  - 24Mbps  */
 665         6,      /* 0x0A  - 12Mbps  */
 666         4,      /* 0x0B  - 6Mbps   */
 667         11,     /* 0x0C  - 54Mbps  */
 668         9,      /* 0x0D  - 36Mbps  */
 669         7,      /* 0x0E  - 18Mbps  */
 670         5,      /* 0x0F  - 9Mbps   */
 671 };
 672
 673 static void ath10k_htt_rx_h_rates(struct ath10k *ar,
 674                                   struct ieee80211_rx_status *status,
 675                                   struct htt_rx_desc *rxd)
 676 {
 677         enum ieee80211_band band;
 678         u8 cck, rate, rate_idx, bw, sgi, mcs, nss;
 679         u8 preamble = 0;
 680         u32 info1, info2, info3;
 681
 682         /* Band value can't be set as undefined but freq can be 0 - use that to
 683          * determine whether band is provided.
 684          *
 685          * FIXME: Perhaps this can go away if CCK rate reporting is a little
 686          * reworked?
 687          */
 688         if (!status->freq)
 689                 return;
 690
 691         band = status->band;
 692         info1 = __le32_to_cpu(rxd->ppdu_start.info1);
 693         info2 = __le32_to_cpu(rxd->ppdu_start.info2);
 694         info3 = __le32_to_cpu(rxd->ppdu_start.info3);
 695
 696         preamble = MS(info1, RX_PPDU_START_INFO1_PREAMBLE_TYPE);
 697
 698         switch (preamble) {
 699         case HTT_RX_LEGACY:
 700                 cck = info1 & RX_PPDU_START_INFO1_L_SIG_RATE_SELECT;
 701                 rate = MS(info1, RX_PPDU_START_INFO1_L_SIG_RATE);
 702                 rate_idx = 0;
 703
 704                 if (rate < 0x08 || rate > 0x0F)
 705                         break;
 706
 707                 switch (band) {
 708                 case IEEE80211_BAND_2GHZ:
 709                         if (cck)
 710                                 rate &= ~BIT(3);
 711                         rate_idx = rx_legacy_rate_idx[rate];
 712                         break;
 713                 case IEEE80211_BAND_5GHZ:
 714                         rate_idx = rx_legacy_rate_idx[rate];
 715                         /* We are using same rate table registering
 716                            HW - ath10k_rates[]. In case of 5GHz skip
 717                            CCK rates, so -4 here */
 718                         rate_idx -= 4;
 719                         break;
 720                 default:
 721                         break;
 722                 }
 723
 724                 status->rate_idx = rate_idx;
 725                 break;
 726         case HTT_RX_HT:
 727         case HTT_RX_HT_WITH_TXBF:
 728                 /* HT-SIG - Table 20-11 in info2 and info3 */
 729                 mcs = info2 & 0x1F;
 730                 nss = mcs >> 3;
 731                 bw = (info2 >> 7) & 1;
 732                 sgi = (info3 >> 7) & 1;
 733
 734                 status->rate_idx = mcs;
 735                 status->flag |= RX_FLAG_HT;
 736                 if (sgi)
 737                         status->flag |= RX_FLAG_SHORT_GI;
 738                 if (bw)
 739                         status->flag |= RX_FLAG_40MHZ;
 740                 break;
 741         case HTT_RX_VHT:
 742         case HTT_RX_VHT_WITH_TXBF:
 743                 /* VHT-SIG-A1 in info2, VHT-SIG-A2 in info3
 744                    TODO check this */
 745                 mcs = (info3 >> 4) & 0x0F;
 746                 nss = ((info2 >> 10) & 0x07) + 1;
 747                 bw = info2 & 3;
 748                 sgi = info3 & 1;
 749
 750                 status->rate_idx = mcs;
 751                 status->vht_nss = nss;
 752
 753                 if (sgi)
 754                         status->flag |= RX_FLAG_SHORT_GI;
 755
 756                 switch (bw) {
 757                 /* 20MHZ */
 758                 case 0:
 759                         break;
 760                 /* 40MHZ */
 761                 case 1:
 762                         status->flag |= RX_FLAG_40MHZ;
 763                         break;
 764                 /* 80MHZ */
 765                 case 2:
 766                         status->vht_flag |= RX_VHT_FLAG_80MHZ;
 767                 }
 768
 769                 status->flag |= RX_FLAG_VHT;
 770                 break;
 771         default:
 772                 break;
 773         }
 774 }
 775
 776 static bool ath10k_htt_rx_h_channel(struct ath10k *ar,
 777                                     struct ieee80211_rx_status *status)
 778 {
 779         struct ieee80211_channel *ch;
 780
 781         spin_lock_bh(&ar->data_lock);
 782         ch = ar->scan_channel;
 783         if (!ch)
 784                 ch = ar->rx_channel;
 785         spin_unlock_bh(&ar->data_lock);
 786
 787         if (!ch)
 788                 return false;
 789
 790         status->band = ch->band;
 791         status->freq = ch->center_freq;
 792
 793         return true;
 794 }
 795
 796 static void ath10k_htt_rx_h_signal(struct ath10k *ar,
 797                                    struct ieee80211_rx_status *status,
 798                                    struct htt_rx_desc *rxd)
 799 {
 800         /* FIXME: Get real NF */
 801         status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
 802                          rxd->ppdu_start.rssi_comb;
 803         status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
 804 }
 805
 806 static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
 807                                     struct ieee80211_rx_status *status,
 808                                     struct htt_rx_desc *rxd)
 809 {
 810         /* FIXME: TSF is known only at the end of PPDU, in the last MPDU. This
 811          * means all prior MSDUs in a PPDU are reported to mac80211 without the
 812          * TSF. Is it worth holding frames until end of PPDU is known?
 813          *
 814          * FIXME: Can we get/compute 64bit TSF?
 815          */
 816         status->mactime = __le32_to_cpu(rxd->ppdu_end.common.tsf_timestamp);
 817         status->flag |= RX_FLAG_MACTIME_END;
 818 }
 819
 820 static void ath10k_htt_rx_h_ppdu(struct ath10k *ar,
 821                                  struct sk_buff_head *amsdu,
 822                                  struct ieee80211_rx_status *status)
 823 {
 824         struct sk_buff *first;
 825         struct htt_rx_desc *rxd;
 826         bool is_first_ppdu;
 827         bool is_last_ppdu;
 828
 829         if (skb_queue_empty(amsdu))
 830                 return;
 831
 832         first = skb_peek(amsdu);
 833         rxd = (void *)first->data - sizeof(*rxd);
 834
 835         is_first_ppdu = !!(rxd->attention.flags &
 836                            __cpu_to_le32(RX_ATTENTION_FLAGS_FIRST_MPDU));
 837         is_last_ppdu = !!(rxd->attention.flags &
 838                           __cpu_to_le32(RX_ATTENTION_FLAGS_LAST_MPDU));
 839
 840         if (is_first_ppdu) {
 841                 /* New PPDU starts so clear out the old per-PPDU status. */
 842                 status->freq = 0;
 843                 status->rate_idx = 0;
 844                 status->vht_nss = 0;
 845                 status->vht_flag &= ~RX_VHT_FLAG_80MHZ;
 846                 status->flag &= ~(RX_FLAG_HT |
 847                                   RX_FLAG_VHT |
 848                                   RX_FLAG_SHORT_GI |
 849                                   RX_FLAG_40MHZ |
 850                                   RX_FLAG_MACTIME_END);
 851                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 852
 853                 ath10k_htt_rx_h_signal(ar, status, rxd);
 854                 ath10k_htt_rx_h_channel(ar, status);
 855                 ath10k_htt_rx_h_rates(ar, status, rxd);
 856         }
 857
 858         if (is_last_ppdu)
 859                 ath10k_htt_rx_h_mactime(ar, status, rxd);
 860 }
 861
 862 static const char * const tid_to_ac[] = {
 863         "BE",
 864         "BK",
 865         "BK",
 866         "BE",
 867         "VI",
 868         "VI",
 869         "VO",
 870         "VO",
 871 };
 872
 873 static char *ath10k_get_tid(struct ieee80211_hdr *hdr, char *out, size_t size)
 874 {
 875         u8 *qc;
 876         int tid;
 877
 878         if (!ieee80211_is_data_qos(hdr->frame_control))
 879                 return "";
 880
 881         qc = ieee80211_get_qos_ctl(hdr);
 882         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 883         if (tid < 8)
 884                 snprintf(out, size, "tid %d (%s)", tid, tid_to_ac[tid]);
 885         else
 886                 snprintf(out, size, "tid %d", tid);
 887
 888         return out;
 889 }
 890
 891 static void ath10k_process_rx(struct ath10k *ar,
 892                               struct ieee80211_rx_status *rx_status,
 893                               struct sk_buff *skb)
 894 {
 895         struct ieee80211_rx_status *status;
 896         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 897         char tid[32];
 898
 899         status = IEEE80211_SKB_RXCB(skb);
 900         *status = *rx_status;
 901
 902         ath10k_dbg(ar, ATH10K_DBG_DATA,
 903                    "rx skb %p len %u peer %pM %s %s sn %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u flag 0x%x fcs-err %i mic-err %i amsdu-more %i\n",
 904                    skb,
 905                    skb->len,
 906                    ieee80211_get_SA(hdr),
 907                    ath10k_get_tid(hdr, tid, sizeof(tid)),
 908                    is_multicast_ether_addr(ieee80211_get_DA(hdr)) ?
 909                                                         "mcast" : "ucast",
 910                    (__le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4,
 911                    status->flag == 0 ? "legacy" : "",
 912                    status->flag & RX_FLAG_HT ? "ht" : "",
 913                    status->flag & RX_FLAG_VHT ? "vht" : "",
 914                    status->flag & RX_FLAG_40MHZ ? "40" : "",
 915                    status->vht_flag & RX_VHT_FLAG_80MHZ ? "80" : "",
 916                    status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
 917                    status->rate_idx,
 918                    status->vht_nss,
 919                    status->freq,
 920                    status->band, status->flag,
 921                    !!(status->flag & RX_FLAG_FAILED_FCS_CRC),
 922                    !!(status->flag & RX_FLAG_MMIC_ERROR),
 923                    !!(status->flag & RX_FLAG_AMSDU_MORE));
 924         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
 925                         skb->data, skb->len);
 926         trace_ath10k_rx_hdr(ar, skb->data, skb->len);
 927         trace_ath10k_rx_payload(ar, skb->data, skb->len);
 928
 929         ieee80211_rx(ar->hw, skb);
 930 }
 931
 932 static int ath10k_htt_rx_nwifi_hdrlen(struct ieee80211_hdr *hdr)
 933 {
 934         /* nwifi header is padded to 4 bytes. this fixes 4addr rx */
 935         return round_up(ieee80211_hdrlen(hdr->frame_control), 4);
 936 }
 937
 938 static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
 939                                         struct sk_buff *msdu,
 940                                         struct ieee80211_rx_status *status,
 941                                         enum htt_rx_mpdu_encrypt_type enctype,
 942                                         bool is_decrypted)
 943 {
 944         struct ieee80211_hdr *hdr;
 945         struct htt_rx_desc *rxd;
 946         size_t hdr_len;
 947         size_t crypto_len;
 948         bool is_first;
 949         bool is_last;
 950
 951         rxd = (void *)msdu->data - sizeof(*rxd);
 952         is_first = !!(rxd->msdu_end.info0 &
 953                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
 954         is_last = !!(rxd->msdu_end.info0 &
 955                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
 956
 957         /* Delivered decapped frame:
 958          * [802.11 header]
 959          * [crypto param] <-- can be trimmed if !fcs_err &&
 960          *                    !decrypt_err && !peer_idx_invalid
 961          * [amsdu header] <-- only if A-MSDU
 962          * [rfc1042/llc]
 963          * [payload]
 964          * [FCS] <-- at end, needs to be trimmed
 965          */
 966
 967         /* This probably shouldn't happen but warn just in case */
 968         if (unlikely(WARN_ON_ONCE(!is_first)))
 969                 return;
 970
 971         /* This probably shouldn't happen but warn just in case */
 972         if (unlikely(WARN_ON_ONCE(!(is_first && is_last))))
 973                 return;
 974
 975         skb_trim(msdu, msdu->len - FCS_LEN);
 976
 977         /* In most cases this will be true for sniffed frames. It makes sense
 978          * to deliver them as-is without stripping the crypto param. This would
 979          * also make sense for software based decryption (which is not
 980          * implemented in ath10k).
 981          *
 982          * If there's no error then the frame is decrypted. At least that is
 983          * the case for frames that come in via fragmented rx indication.
 984          */
 985         if (!is_decrypted)
 986                 return;
 987
 988         /* The payload is decrypted so strip crypto params. Start from tail
 989          * since hdr is used to compute some stuff.
 990          */
 991
 992         hdr = (void *)msdu->data;
 993
 994         /* Tail */
 995         skb_trim(msdu, msdu->len - ath10k_htt_rx_crypto_tail_len(ar, enctype));
 996
 997         /* MMIC */
 998         if (!ieee80211_has_morefrags(hdr->frame_control) &&
 999             enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
1000                 skb_trim(msdu, msdu->len - 8);
1001
1002         /* Head */
1003         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1004         crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1005
1006         memmove((void *)msdu->data + crypto_len,
1007                 (void *)msdu->data, hdr_len);
1008         skb_pull(msdu, crypto_len);
1009 }
1010
1011 static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
1012                                           struct sk_buff *msdu,
1013                                           struct ieee80211_rx_status *status,
1014                                           const u8 first_hdr[64])
1015 {
1016         struct ieee80211_hdr *hdr;
1017         size_t hdr_len;
1018         u8 da[ETH_ALEN];
1019         u8 sa[ETH_ALEN];
1020
1021         /* Delivered decapped frame:
1022          * [nwifi 802.11 header] <-- replaced with 802.11 hdr
1023          * [rfc1042/llc]
1024          *
1025          * Note: The nwifi header doesn't have QoS Control and is
1026          * (always?) a 3addr frame.
1027          *
1028          * Note2: There's no A-MSDU subframe header. Even if it's part
1029          * of an A-MSDU.
1030          */
1031
1032         /* pull decapped header and copy SA & DA */
1033         hdr = (struct ieee80211_hdr *)msdu->data;
1034         hdr_len = ath10k_htt_rx_nwifi_hdrlen(hdr);
1035         ether_addr_copy(da, ieee80211_get_DA(hdr));
1036         ether_addr_copy(sa, ieee80211_get_SA(hdr));
1037         skb_pull(msdu, hdr_len);
1038
1039         /* push original 802.11 header */
1040         hdr = (struct ieee80211_hdr *)first_hdr;
1041         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1042         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1043
1044         /* original 802.11 header has a different DA and in
1045          * case of 4addr it may also have different SA
1046          */
1047         hdr = (struct ieee80211_hdr *)msdu->data;
1048         ether_addr_copy(ieee80211_get_DA(hdr), da);
1049         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1050 }
1051
1052 static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar,
1053                                           struct sk_buff *msdu,
1054                                           enum htt_rx_mpdu_encrypt_type enctype)
1055 {
1056         struct ieee80211_hdr *hdr;
1057         struct htt_rx_desc *rxd;
1058         size_t hdr_len, crypto_len;
1059         void *rfc1042;
1060         bool is_first, is_last, is_amsdu;
1061
1062         rxd = (void *)msdu->data - sizeof(*rxd);
1063         hdr = (void *)rxd->rx_hdr_status;
1064
1065         is_first = !!(rxd->msdu_end.info0 &
1066                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1067         is_last = !!(rxd->msdu_end.info0 &
1068                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
1069         is_amsdu = !(is_first && is_last);
1070
1071         rfc1042 = hdr;
1072
1073         if (is_first) {
1074                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1075                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1076
1077                 rfc1042 += round_up(hdr_len, 4) +
1078                            round_up(crypto_len, 4);
1079         }
1080
1081         if (is_amsdu)
1082                 rfc1042 += sizeof(struct amsdu_subframe_hdr);
1083
1084         return rfc1042;
1085 }
1086
1087 static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
1088                                         struct sk_buff *msdu,
1089                                         struct ieee80211_rx_status *status,
1090                                         const u8 first_hdr[64],
1091                                         enum htt_rx_mpdu_encrypt_type enctype)
1092 {
1093         struct ieee80211_hdr *hdr;
1094         struct ethhdr *eth;
1095         size_t hdr_len;
1096         void *rfc1042;
1097         u8 da[ETH_ALEN];
1098         u8 sa[ETH_ALEN];
1099
1100         /* Delivered decapped frame:
1101          * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
1102          * [payload]
1103          */
1104
1105         rfc1042 = ath10k_htt_rx_h_find_rfc1042(ar, msdu, enctype);
1106         if (WARN_ON_ONCE(!rfc1042))
1107                 return;
1108
1109         /* pull decapped header and copy SA & DA */
1110         eth = (struct ethhdr *)msdu->data;
1111         ether_addr_copy(da, eth->h_dest);
1112         ether_addr_copy(sa, eth->h_source);
1113         skb_pull(msdu, sizeof(struct ethhdr));
1114
1115         /* push rfc1042/llc/snap */
1116         memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042,
1117                sizeof(struct rfc1042_hdr));
1118
1119         /* push original 802.11 header */
1120         hdr = (struct ieee80211_hdr *)first_hdr;
1121         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1122         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1123
1124         /* original 802.11 header has a different DA and in
1125          * case of 4addr it may also have different SA
1126          */
1127         hdr = (struct ieee80211_hdr *)msdu->data;
1128         ether_addr_copy(ieee80211_get_DA(hdr), da);
1129         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1130 }
1131
1132 static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
1133                                          struct sk_buff *msdu,
1134                                          struct ieee80211_rx_status *status,
1135                                          const u8 first_hdr[64])
1136 {
1137         struct ieee80211_hdr *hdr;
1138         size_t hdr_len;
1139
1140         /* Delivered decapped frame:
1141          * [amsdu header] <-- replaced with 802.11 hdr
1142          * [rfc1042/llc]
1143          * [payload]
1144          */
1145
1146         skb_pull(msdu, sizeof(struct amsdu_subframe_hdr));
1147
1148         hdr = (struct ieee80211_hdr *)first_hdr;
1149         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1150         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1151 }
1152
1153 static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
1154                                     struct sk_buff *msdu,
1155                                     struct ieee80211_rx_status *status,
1156                                     u8 first_hdr[64],
1157                                     enum htt_rx_mpdu_encrypt_type enctype,
1158                                     bool is_decrypted)
1159 {
1160         struct htt_rx_desc *rxd;
1161         enum rx_msdu_decap_format decap;
1162         struct ieee80211_hdr *hdr;
1163
1164         /* First msdu's decapped header:
1165          * [802.11 header] <-- padded to 4 bytes long
1166          * [crypto param] <-- padded to 4 bytes long
1167          * [amsdu header] <-- only if A-MSDU
1168          * [rfc1042/llc]
1169          *
1170          * Other (2nd, 3rd, ..) msdu's decapped header:
1171          * [amsdu header] <-- only if A-MSDU
1172          * [rfc1042/llc]
1173          */
1174
1175         rxd = (void *)msdu->data - sizeof(*rxd);
1176         hdr = (void *)rxd->rx_hdr_status;
1177         decap = MS(__le32_to_cpu(rxd->msdu_start.info1),
1178                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1179
1180         switch (decap) {
1181         case RX_MSDU_DECAP_RAW:
1182                 ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype,
1183                                             is_decrypted);
1184                 break;
1185         case RX_MSDU_DECAP_NATIVE_WIFI:
1186                 ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
1187                 break;
1188         case RX_MSDU_DECAP_ETHERNET2_DIX:
1189                 ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
1190                 break;
1191         case RX_MSDU_DECAP_8023_SNAP_LLC:
1192                 ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
1193                 break;
1194         }
1195 }
1196
1197 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
1198 {
1199         struct htt_rx_desc *rxd;
1200         u32 flags, info;
1201         bool is_ip4, is_ip6;
1202         bool is_tcp, is_udp;
1203         bool ip_csum_ok, tcpudp_csum_ok;
1204
1205         rxd = (void *)skb->data - sizeof(*rxd);
1206         flags = __le32_to_cpu(rxd->attention.flags);
1207         info = __le32_to_cpu(rxd->msdu_start.info1);
1208
1209         is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
1210         is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
1211         is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
1212         is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
1213         ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
1214         tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);
1215
1216         if (!is_ip4 && !is_ip6)
1217                 return CHECKSUM_NONE;
1218         if (!is_tcp && !is_udp)
1219                 return CHECKSUM_NONE;
1220         if (!ip_csum_ok)
1221                 return CHECKSUM_NONE;
1222         if (!tcpudp_csum_ok)
1223                 return CHECKSUM_NONE;
1224
1225         return CHECKSUM_UNNECESSARY;
1226 }
1227
1228 static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
1229 {
1230         msdu->ip_summed = ath10k_htt_rx_get_csum_state(msdu);
1231 }
1232
1233 static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
1234                                  struct sk_buff_head *amsdu,
1235                                  struct ieee80211_rx_status *status)
1236 {
1237         struct sk_buff *first;
1238         struct sk_buff *last;
1239         struct sk_buff *msdu;
1240         struct htt_rx_desc *rxd;
1241         struct ieee80211_hdr *hdr;
1242         enum htt_rx_mpdu_encrypt_type enctype;
1243         u8 first_hdr[64];
1244         u8 *qos;
1245         size_t hdr_len;
1246         bool has_fcs_err;
1247         bool has_crypto_err;
1248         bool has_tkip_err;
1249         bool has_peer_idx_invalid;
1250         bool is_decrypted;
1251         u32 attention;
1252
1253         if (skb_queue_empty(amsdu))
1254                 return;
1255
1256         first = skb_peek(amsdu);
1257         rxd = (void *)first->data - sizeof(*rxd);
1258
1259         enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
1260                      RX_MPDU_START_INFO0_ENCRYPT_TYPE);
1261
1262         /* First MSDU's Rx descriptor in an A-MSDU contains full 802.11
1263          * decapped header. It'll be used for undecapping of each MSDU.
1264          */
1265         hdr = (void *)rxd->rx_hdr_status;
1266         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1267         memcpy(first_hdr, hdr, hdr_len);
1268
1269         /* Each A-MSDU subframe will use the original header as the base and be
1270          * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
1271          */
1272         hdr = (void *)first_hdr;
1273         qos = ieee80211_get_qos_ctl(hdr);
1274         qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
1275
1276         /* Some attention flags are valid only in the last MSDU. */
1277         last = skb_peek_tail(amsdu);
1278         rxd = (void *)last->data - sizeof(*rxd);
1279         attention = __le32_to_cpu(rxd->attention.flags);
1280
1281         has_fcs_err = !!(attention & RX_ATTENTION_FLAGS_FCS_ERR);
1282         has_crypto_err = !!(attention & RX_ATTENTION_FLAGS_DECRYPT_ERR);
1283         has_tkip_err = !!(attention & RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
1284         has_peer_idx_invalid = !!(attention & RX_ATTENTION_FLAGS_PEER_IDX_INVALID);
1285
1286         /* Note: If hardware captures an encrypted frame that it can't decrypt,
1287          * e.g. due to fcs error, missing peer or invalid key data it will
1288          * report the frame as raw.
1289          */
1290         is_decrypted = (enctype != HTT_RX_MPDU_ENCRYPT_NONE &&
1291                         !has_fcs_err &&
1292                         !has_crypto_err &&
1293                         !has_peer_idx_invalid);
1294
1295         /* Clear per-MPDU flags while leaving per-PPDU flags intact. */
1296         status->flag &= ~(RX_FLAG_FAILED_FCS_CRC |
1297                           RX_FLAG_MMIC_ERROR |
1298                           RX_FLAG_DECRYPTED |
1299                           RX_FLAG_IV_STRIPPED |
1300                           RX_FLAG_MMIC_STRIPPED);
1301
1302         if (has_fcs_err)
1303                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
1304
1305         if (has_tkip_err)
1306                 status->flag |= RX_FLAG_MMIC_ERROR;
1307
1308         if (is_decrypted)
1309                 status->flag |= RX_FLAG_DECRYPTED |
1310                                 RX_FLAG_IV_STRIPPED |
1311                                 RX_FLAG_MMIC_STRIPPED;
1312
1313         skb_queue_walk(amsdu, msdu) {
1314                 ath10k_htt_rx_h_csum_offload(msdu);
1315                 ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
1316                                         is_decrypted);
1317
1318                 /* Undecapping involves copying the original 802.11 header back
1319                  * to sk_buff. If frame is protected and hardware has decrypted
1320                  * it then remove the protected bit.
1321                  */
1322                 if (!is_decrypted)
1323                         continue;
1324
1325                 hdr = (void *)msdu->data;
1326                 hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1327         }
1328 }
1329
1330 static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
1331                                     struct sk_buff_head *amsdu,
1332                                     struct ieee80211_rx_status *status)
1333 {
1334         struct sk_buff *msdu;
1335
1336         while ((msdu = __skb_dequeue(amsdu))) {
1337                 /* Setup per-MSDU flags */
1338                 if (skb_queue_empty(amsdu))
1339                         status->flag &= ~RX_FLAG_AMSDU_MORE;
1340                 else
1341                         status->flag |= RX_FLAG_AMSDU_MORE;
1342
1343                 ath10k_process_rx(ar, status, msdu);
1344         }
1345 }
1346
1347 static int ath10k_unchain_msdu(struct sk_buff_head *amsdu)
1348 {
1349         struct sk_buff *skb, *first;
1350         int space;
1351         int total_len = 0;
1352
1353         /* TODO:  Might could optimize this by using
1354          * skb_try_coalesce or similar method to
1355          * decrease copying, or maybe get mac80211 to
1356          * provide a way to just receive a list of
1357          * skb?
1358          */
1359
1360         first = __skb_dequeue(amsdu);
1361
1362         /* Allocate total length all at once. */
1363         skb_queue_walk(amsdu, skb)
1364                 total_len += skb->len;
1365
1366         space = total_len - skb_tailroom(first);
1367         if ((space > 0) &&
1368             (pskb_expand_head(first, 0, space, GFP_ATOMIC) < 0)) {
1369                 /* TODO:  bump some rx-oom error stat */
1370                 /* put it back together so we can free the
1371                  * whole list at once.
1372                  */
1373                 __skb_queue_head(amsdu, first);
1374                 return -1;
1375         }
1376
1377         /* Walk list again, copying contents into
1378          * msdu_head
1379          */
1380         while ((skb = __skb_dequeue(amsdu))) {
1381                 skb_copy_from_linear_data(skb, skb_put(first, skb->len),
1382                                           skb->len);
1383                 dev_kfree_skb_any(skb);
1384         }
1385
1386         __skb_queue_head(amsdu, first);
1387         return 0;
1388 }
1389
1390 static void ath10k_htt_rx_h_unchain(struct ath10k *ar,
1391                                     struct sk_buff_head *amsdu,
1392                                     bool chained)
1393 {
1394         struct sk_buff *first;
1395         struct htt_rx_desc *rxd;
1396         enum rx_msdu_decap_format decap;
1397
1398         first = skb_peek(amsdu);
1399         rxd = (void *)first->data - sizeof(*rxd);
1400         decap = MS(__le32_to_cpu(rxd->msdu_start.info1),
1401                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1402
1403         if (!chained)
1404                 return;
1405
1406         /* FIXME: Current unchaining logic can only handle simple case of raw
1407          * msdu chaining. If decapping is other than raw the chaining may be
1408          * more complex and this isn't handled by the current code. Don't even
1409          * try re-constructing such frames - it'll be pretty much garbage.
1410          */
1411         if (decap != RX_MSDU_DECAP_RAW ||
1412             skb_queue_len(amsdu) != 1 + rxd->frag_info.ring2_more_count) {
1413                 __skb_queue_purge(amsdu);
1414                 return;
1415         }
1416
1417         ath10k_unchain_msdu(amsdu);
1418 }
1419
1420 static bool ath10k_htt_rx_amsdu_allowed(struct ath10k *ar,
1421                                         struct sk_buff_head *amsdu,
1422                                         struct ieee80211_rx_status *rx_status)
1423 {
1424         struct sk_buff *msdu;
1425         struct htt_rx_desc *rxd;
1426         bool is_mgmt;
1427         bool has_fcs_err;
1428
1429         msdu = skb_peek(amsdu);
1430         rxd = (void *)msdu->data - sizeof(*rxd);
1431
1432         /* FIXME: It might be a good idea to do some fuzzy-testing to drop
1433          * invalid/dangerous frames.
1434          */
1435
1436         if (!rx_status->freq) {
1437                 ath10k_warn(ar, "no channel configured; ignoring frame(s)!\n");
1438                 return false;
1439         }
1440
1441         is_mgmt = !!(rxd->attention.flags &
1442                      __cpu_to_le32(RX_ATTENTION_FLAGS_MGMT_TYPE));
1443         has_fcs_err = !!(rxd->attention.flags &
1444                          __cpu_to_le32(RX_ATTENTION_FLAGS_FCS_ERR));
1445
1446         /* Management frames are handled via WMI events. The pros of such
1447          * approach is that channel is explicitly provided in WMI events
1448          * whereas HTT doesn't provide channel information for Rxed frames.
1449          *
1450          * However some firmware revisions don't report corrupted frames via
1451          * WMI so don't drop them.
1452          */
1453         if (is_mgmt && !has_fcs_err) {
1454                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx mgmt ctrl\n");
1455                 return false;
1456         }
1457
1458         if (test_bit(ATH10K_CAC_RUNNING, &ar->dev_flags)) {
1459                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx cac running\n");
1460                 return false;
1461         }
1462
1463         return true;
1464 }
1465
1466 static void ath10k_htt_rx_h_filter(struct ath10k *ar,
1467                                    struct sk_buff_head *amsdu,
1468                                    struct ieee80211_rx_status *rx_status)
1469 {
1470         if (skb_queue_empty(amsdu))
1471                 return;
1472
1473         if (ath10k_htt_rx_amsdu_allowed(ar, amsdu, rx_status))
1474                 return;
1475
1476         __skb_queue_purge(amsdu);
1477 }
1478
1479 static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
1480                                   struct htt_rx_indication *rx)
1481 {
1482         struct ath10k *ar = htt->ar;
1483         struct ieee80211_rx_status *rx_status = &htt->rx_status;
1484         struct htt_rx_indication_mpdu_range *mpdu_ranges;
1485         struct sk_buff_head amsdu;
1486         int num_mpdu_ranges;
1487         int fw_desc_len;
1488         u8 *fw_desc;
1489         int i, ret, mpdu_count = 0;
1490
1491         lockdep_assert_held(&htt->rx_ring.lock);
1492
1493         if (htt->rx_confused)
1494                 return;
1495
1496         fw_desc_len = __le16_to_cpu(rx->prefix.fw_rx_desc_bytes);
1497         fw_desc = (u8 *)&rx->fw_desc;
1498
1499         num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
1500                              HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
1501         mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
1502
1503         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
1504                         rx, sizeof(*rx) +
1505                         (sizeof(struct htt_rx_indication_mpdu_range) *
1506                                 num_mpdu_ranges));
1507
1508         for (i = 0; i < num_mpdu_ranges; i++)
1509                 mpdu_count += mpdu_ranges[i].mpdu_count;
1510
1511         while (mpdu_count--) {
1512                 __skb_queue_head_init(&amsdu);
1513                 ret = ath10k_htt_rx_amsdu_pop(htt, &fw_desc,
1514                                               &fw_desc_len, &amsdu);
1515                 if (ret < 0) {
1516                         ath10k_warn(ar, "rx ring became corrupted: %d\n", ret);
1517                         __skb_queue_purge(&amsdu);
1518                         /* FIXME: It's probably a good idea to reboot the
1519                          * device instead of leaving it inoperable.
1520                          */
1521                         htt->rx_confused = true;
1522                         break;
1523                 }
1524
1525                 ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status);
1526                 ath10k_htt_rx_h_unchain(ar, &amsdu, ret > 0);
1527                 ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
1528                 ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
1529                 ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1530         }
1531
1532         tasklet_schedule(&htt->rx_replenish_task);
1533 }
1534
1535 static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,
1536                                        struct htt_rx_fragment_indication *frag)
1537 {
1538         struct ath10k *ar = htt->ar;
1539         struct ieee80211_rx_status *rx_status = &htt->rx_status;
1540         struct sk_buff_head amsdu;
1541         int ret;
1542         u8 *fw_desc;
1543         int fw_desc_len;
1544
1545         fw_desc_len = __le16_to_cpu(frag->fw_rx_desc_bytes);
1546         fw_desc = (u8 *)frag->fw_msdu_rx_desc;
1547
1548         __skb_queue_head_init(&amsdu);
1549
1550         spin_lock_bh(&htt->rx_ring.lock);
1551         ret = ath10k_htt_rx_amsdu_pop(htt, &fw_desc, &fw_desc_len,
1552                                       &amsdu);
1553         spin_unlock_bh(&htt->rx_ring.lock);
1554
1555         tasklet_schedule(&htt->rx_replenish_task);
1556
1557         ath10k_dbg(ar, ATH10K_DBG_HTT_DUMP, "htt rx frag ahead\n");
1558
1559         if (ret) {
1560                 ath10k_warn(ar, "failed to pop amsdu from httr rx ring for fragmented rx %d\n",
1561                             ret);
1562                 __skb_queue_purge(&amsdu);
1563                 return;
1564         }
1565
1566         if (skb_queue_len(&amsdu) != 1) {
1567                 ath10k_warn(ar, "failed to pop frag amsdu: too many msdus\n");
1568                 __skb_queue_purge(&amsdu);
1569                 return;
1570         }
1571
1572         ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status);
1573         ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
1574         ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
1575         ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1576
1577         if (fw_desc_len > 0) {
1578                 ath10k_dbg(ar, ATH10K_DBG_HTT,
1579                            "expecting more fragmented rx in one indication %d\n",
1580                            fw_desc_len);
1581         }
1582 }
1583
1584 static void ath10k_htt_rx_frm_tx_compl(struct ath10k *ar,
1585                                        struct sk_buff *skb)
1586 {
1587         struct ath10k_htt *htt = &ar->htt;
1588         struct htt_resp *resp = (struct htt_resp *)skb->data;
1589         struct htt_tx_done tx_done = {};
1590         int status = MS(resp->data_tx_completion.flags, HTT_DATA_TX_STATUS);
1591         __le16 msdu_id;
1592         int i;
1593
1594         lockdep_assert_held(&htt->tx_lock);
1595
1596         switch (status) {
1597         case HTT_DATA_TX_STATUS_NO_ACK:
1598                 tx_done.no_ack = true;
1599                 break;
1600         case HTT_DATA_TX_STATUS_OK:
1601                 break;
1602         case HTT_DATA_TX_STATUS_DISCARD:
1603         case HTT_DATA_TX_STATUS_POSTPONE:
1604         case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
1605                 tx_done.discard = true;
1606                 break;
1607         default:
1608                 ath10k_warn(ar, "unhandled tx completion status %d\n", status);
1609                 tx_done.discard = true;
1610                 break;
1611         }
1612
1613         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
1614                    resp->data_tx_completion.num_msdus);
1615
1616         for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
1617                 msdu_id = resp->data_tx_completion.msdus[i];
1618                 tx_done.msdu_id = __le16_to_cpu(msdu_id);
1619                 ath10k_txrx_tx_unref(htt, &tx_done);
1620         }
1621 }
1622
1623 static void ath10k_htt_rx_addba(struct ath10k *ar, struct htt_resp *resp)
1624 {
1625         struct htt_rx_addba *ev = &resp->rx_addba;
1626         struct ath10k_peer *peer;
1627         struct ath10k_vif *arvif;
1628         u16 info0, tid, peer_id;
1629
1630         info0 = __le16_to_cpu(ev->info0);
1631         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1632         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1633
1634         ath10k_dbg(ar, ATH10K_DBG_HTT,
1635                    "htt rx addba tid %hu peer_id %hu size %hhu\n",
1636                    tid, peer_id, ev->window_size);
1637
1638         spin_lock_bh(&ar->data_lock);
1639         peer = ath10k_peer_find_by_id(ar, peer_id);
1640         if (!peer) {
1641                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1642                             peer_id);
1643                 spin_unlock_bh(&ar->data_lock);
1644                 return;
1645         }
1646
1647         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1648         if (!arvif) {
1649                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1650                             peer->vdev_id);
1651                 spin_unlock_bh(&ar->data_lock);
1652                 return;
1653         }
1654
1655         ath10k_dbg(ar, ATH10K_DBG_HTT,
1656                    "htt rx start rx ba session sta %pM tid %hu size %hhu\n",
1657                    peer->addr, tid, ev->window_size);
1658
1659         ieee80211_start_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1660         spin_unlock_bh(&ar->data_lock);
1661 }
1662
1663 static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
1664 {
1665         struct htt_rx_delba *ev = &resp->rx_delba;
1666         struct ath10k_peer *peer;
1667         struct ath10k_vif *arvif;
1668         u16 info0, tid, peer_id;
1669
1670         info0 = __le16_to_cpu(ev->info0);
1671         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1672         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1673
1674         ath10k_dbg(ar, ATH10K_DBG_HTT,
1675                    "htt rx delba tid %hu peer_id %hu\n",
1676                    tid, peer_id);
1677
1678         spin_lock_bh(&ar->data_lock);
1679         peer = ath10k_peer_find_by_id(ar, peer_id);
1680         if (!peer) {
1681                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1682                             peer_id);
1683                 spin_unlock_bh(&ar->data_lock);
1684                 return;
1685         }
1686
1687         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1688         if (!arvif) {
1689                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1690                             peer->vdev_id);
1691                 spin_unlock_bh(&ar->data_lock);
1692                 return;
1693         }
1694
1695         ath10k_dbg(ar, ATH10K_DBG_HTT,
1696                    "htt rx stop rx ba session sta %pM tid %hu\n",
1697                    peer->addr, tid);
1698
1699         ieee80211_stop_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1700         spin_unlock_bh(&ar->data_lock);
1701 }
1702
1703 static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
1704                                        struct sk_buff_head *amsdu)
1705 {
1706         struct sk_buff *msdu;
1707         struct htt_rx_desc *rxd;
1708
1709         if (skb_queue_empty(list))
1710                 return -ENOBUFS;
1711
1712         if (WARN_ON(!skb_queue_empty(amsdu)))
1713                 return -EINVAL;
1714
1715         while ((msdu = __skb_dequeue(list))) {
1716                 __skb_queue_tail(amsdu, msdu);
1717
1718                 rxd = (void *)msdu->data - sizeof(*rxd);
1719                 if (rxd->msdu_end.info0 &
1720                     __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))
1721                         break;
1722         }
1723
1724         msdu = skb_peek_tail(amsdu);
1725         rxd = (void *)msdu->data - sizeof(*rxd);
1726         if (!(rxd->msdu_end.info0 &
1727               __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))) {
1728                 skb_queue_splice_init(amsdu, list);
1729                 return -EAGAIN;
1730         }
1731
1732         return 0;
1733 }
1734
1735 static void ath10k_htt_rx_h_rx_offload_prot(struct ieee80211_rx_status *status,
1736                                             struct sk_buff *skb)
1737 {
1738         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1739
1740         if (!ieee80211_has_protected(hdr->frame_control))
1741                 return;
1742
1743         /* Offloaded frames are already decrypted but firmware insists they are
1744          * protected in the 802.11 header. Strip the flag.  Otherwise mac80211
1745          * will drop the frame.
1746          */
1747
1748         hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1749         status->flag |= RX_FLAG_DECRYPTED |
1750                         RX_FLAG_IV_STRIPPED |
1751                         RX_FLAG_MMIC_STRIPPED;
1752 }
1753
1754 static void ath10k_htt_rx_h_rx_offload(struct ath10k *ar,
1755                                        struct sk_buff_head *list)
1756 {
1757         struct ath10k_htt *htt = &ar->htt;
1758         struct ieee80211_rx_status *status = &htt->rx_status;
1759         struct htt_rx_offload_msdu *rx;
1760         struct sk_buff *msdu;
1761         size_t offset;
1762
1763         while ((msdu = __skb_dequeue(list))) {
1764                 /* Offloaded frames don't have Rx descriptor. Instead they have
1765                  * a short meta information header.
1766                  */
1767
1768                 rx = (void *)msdu->data;
1769
1770                 skb_put(msdu, sizeof(*rx));
1771                 skb_pull(msdu, sizeof(*rx));
1772
1773                 if (skb_tailroom(msdu) < __le16_to_cpu(rx->msdu_len)) {
1774                         ath10k_warn(ar, "dropping frame: offloaded rx msdu is too long!\n");
1775                         dev_kfree_skb_any(msdu);
1776                         continue;
1777                 }
1778
1779                 skb_put(msdu, __le16_to_cpu(rx->msdu_len));
1780
1781                 /* Offloaded rx header length isn't multiple of 2 nor 4 so the
1782                  * actual payload is unaligned. Align the frame.  Otherwise
1783                  * mac80211 complains.  This shouldn't reduce performance much
1784                  * because these offloaded frames are rare.
1785                  */
1786                 offset = 4 - ((unsigned long)msdu->data & 3);
1787                 skb_put(msdu, offset);
1788                 memmove(msdu->data + offset, msdu->data, msdu->len);
1789                 skb_pull(msdu, offset);
1790
1791                 /* FIXME: The frame is NWifi. Re-construct QoS Control
1792                  * if possible later.
1793                  */
1794
1795                 memset(status, 0, sizeof(*status));
1796                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
1797
1798                 ath10k_htt_rx_h_rx_offload_prot(status, msdu);
1799                 ath10k_htt_rx_h_channel(ar, status);
1800                 ath10k_process_rx(ar, status, msdu);
1801         }
1802 }
1803
1804 static void ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
1805 {
1806         struct ath10k_htt *htt = &ar->htt;
1807         struct htt_resp *resp = (void *)skb->data;
1808         struct ieee80211_rx_status *status = &htt->rx_status;
1809         struct sk_buff_head list;
1810         struct sk_buff_head amsdu;
1811         u16 peer_id;
1812         u16 msdu_count;
1813         u8 vdev_id;
1814         u8 tid;
1815         bool offload;
1816         bool frag;
1817         int ret;
1818
1819         lockdep_assert_held(&htt->rx_ring.lock);
1820
1821         if (htt->rx_confused)
1822                 return;
1823
1824         skb_pull(skb, sizeof(resp->hdr));
1825         skb_pull(skb, sizeof(resp->rx_in_ord_ind));
1826
1827         peer_id = __le16_to_cpu(resp->rx_in_ord_ind.peer_id);
1828         msdu_count = __le16_to_cpu(resp->rx_in_ord_ind.msdu_count);
1829         vdev_id = resp->rx_in_ord_ind.vdev_id;
1830         tid = SM(resp->rx_in_ord_ind.info, HTT_RX_IN_ORD_IND_INFO_TID);
1831         offload = !!(resp->rx_in_ord_ind.info &
1832                         HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
1833         frag = !!(resp->rx_in_ord_ind.info & HTT_RX_IN_ORD_IND_INFO_FRAG_MASK);
1834
1835         ath10k_dbg(ar, ATH10K_DBG_HTT,
1836                    "htt rx in ord vdev %i peer %i tid %i offload %i frag %i msdu count %i\n",
1837                    vdev_id, peer_id, tid, offload, frag, msdu_count);
1838
1839         if (skb->len < msdu_count * sizeof(*resp->rx_in_ord_ind.msdu_descs)) {
1840                 ath10k_warn(ar, "dropping invalid in order rx indication\n");
1841                 return;
1842         }
1843
1844         /* The event can deliver more than 1 A-MSDU. Each A-MSDU is later
1845          * extracted and processed.
1846          */
1847         __skb_queue_head_init(&list);
1848         ret = ath10k_htt_rx_pop_paddr_list(htt, &resp->rx_in_ord_ind, &list);
1849         if (ret < 0) {
1850                 ath10k_warn(ar, "failed to pop paddr list: %d\n", ret);
1851                 htt->rx_confused = true;
1852                 return;
1853         }
1854
1855         /* Offloaded frames are very different and need to be handled
1856          * separately.
1857          */
1858         if (offload)
1859                 ath10k_htt_rx_h_rx_offload(ar, &list);
1860
1861         while (!skb_queue_empty(&list)) {
1862                 __skb_queue_head_init(&amsdu);
1863                 ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
1864                 switch (ret) {
1865                 case 0:
1866                         /* Note: The in-order indication may report interleaved
1867                          * frames from different PPDUs meaning reported rx rate
1868                          * to mac80211 isn't accurate/reliable. It's still
1869                          * better to report something than nothing though. This
1870                          * should still give an idea about rx rate to the user.
1871                          */
1872                         ath10k_htt_rx_h_ppdu(ar, &amsdu, status);
1873                         ath10k_htt_rx_h_filter(ar, &amsdu, status);
1874                         ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
1875                         ath10k_htt_rx_h_deliver(ar, &amsdu, status);
1876                         break;
1877                 case -EAGAIN:
1878                         /* fall through */
1879                 default:
1880                         /* Should not happen. */
1881                         ath10k_warn(ar, "failed to extract amsdu: %d\n", ret);
1882                         htt->rx_confused = true;
1883                         __skb_queue_purge(&list);
1884                         return;
1885                 }
1886         }
1887
1888         tasklet_schedule(&htt->rx_replenish_task);
1889 }
1890
1891 void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
1892 {
1893         struct ath10k_htt *htt = &ar->htt;
1894         struct htt_resp *resp = (struct htt_resp *)skb->data;
1895
1896         /* confirm alignment */
1897         if (!IS_ALIGNED((unsigned long)skb->data, 4))
1898                 ath10k_warn(ar, "unaligned htt message, expect trouble\n");
1899
1900         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, msg_type: 0x%0X\n",
1901                    resp->hdr.msg_type);
1902         switch (resp->hdr.msg_type) {
1903         case HTT_T2H_MSG_TYPE_VERSION_CONF: {
1904                 htt->target_version_major = resp->ver_resp.major;
1905                 htt->target_version_minor = resp->ver_resp.minor;
1906                 complete(&htt->target_version_received);
1907                 break;
1908         }
1909         case HTT_T2H_MSG_TYPE_RX_IND:
1910                 spin_lock_bh(&htt->rx_ring.lock);
1911                 __skb_queue_tail(&htt->rx_compl_q, skb);
1912                 spin_unlock_bh(&htt->rx_ring.lock);
1913                 tasklet_schedule(&htt->txrx_compl_task);
1914                 return;
1915         case HTT_T2H_MSG_TYPE_PEER_MAP: {
1916                 struct htt_peer_map_event ev = {
1917                         .vdev_id = resp->peer_map.vdev_id,
1918                         .peer_id = __le16_to_cpu(resp->peer_map.peer_id),
1919                 };
1920                 memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
1921                 ath10k_peer_map_event(htt, &ev);
1922                 break;
1923         }
1924         case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
1925                 struct htt_peer_unmap_event ev = {
1926                         .peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
1927                 };
1928                 ath10k_peer_unmap_event(htt, &ev);
1929                 break;
1930         }
1931         case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
1932                 struct htt_tx_done tx_done = {};
1933                 int status = __le32_to_cpu(resp->mgmt_tx_completion.status);
1934
1935                 tx_done.msdu_id =
1936                         __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
1937
1938                 switch (status) {
1939                 case HTT_MGMT_TX_STATUS_OK:
1940                         break;
1941                 case HTT_MGMT_TX_STATUS_RETRY:
1942                         tx_done.no_ack = true;
1943                         break;
1944                 case HTT_MGMT_TX_STATUS_DROP:
1945                         tx_done.discard = true;
1946                         break;
1947                 }
1948
1949                 spin_lock_bh(&htt->tx_lock);
1950                 ath10k_txrx_tx_unref(htt, &tx_done);
1951                 spin_unlock_bh(&htt->tx_lock);
1952                 break;
1953         }
1954         case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
1955                 spin_lock_bh(&htt->tx_lock);
1956                 __skb_queue_tail(&htt->tx_compl_q, skb);
1957                 spin_unlock_bh(&htt->tx_lock);
1958                 tasklet_schedule(&htt->txrx_compl_task);
1959                 return;
1960         case HTT_T2H_MSG_TYPE_SEC_IND: {
1961                 struct ath10k *ar = htt->ar;
1962                 struct htt_security_indication *ev = &resp->security_indication;
1963
1964                 ath10k_dbg(ar, ATH10K_DBG_HTT,
1965                            "sec ind peer_id %d unicast %d type %d\n",
1966                           __le16_to_cpu(ev->peer_id),
1967                           !!(ev->flags & HTT_SECURITY_IS_UNICAST),
1968                           MS(ev->flags, HTT_SECURITY_TYPE));
1969                 complete(&ar->install_key_done);
1970                 break;
1971         }
1972         case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
1973                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
1974                                 skb->data, skb->len);
1975                 ath10k_htt_rx_frag_handler(htt, &resp->rx_frag_ind);
1976                 break;
1977         }
1978         case HTT_T2H_MSG_TYPE_TEST:
1979                 /* FIX THIS */
1980                 break;
1981         case HTT_T2H_MSG_TYPE_STATS_CONF:
1982                 trace_ath10k_htt_stats(ar, skb->data, skb->len);
1983                 break;
1984         case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
1985                 /* Firmware can return tx frames if it's unable to fully
1986                  * process them and suspects host may be able to fix it. ath10k
1987                  * sends all tx frames as already inspected so this shouldn't
1988                  * happen unless fw has a bug.
1989                  */
1990                 ath10k_warn(ar, "received an unexpected htt tx inspect event\n");
1991                 break;
1992         case HTT_T2H_MSG_TYPE_RX_ADDBA:
1993                 ath10k_htt_rx_addba(ar, resp);
1994                 break;
1995         case HTT_T2H_MSG_TYPE_RX_DELBA:
1996                 ath10k_htt_rx_delba(ar, resp);
1997                 break;
1998         case HTT_T2H_MSG_TYPE_PKTLOG: {
1999                 struct ath10k_pktlog_hdr *hdr =
2000                         (struct ath10k_pktlog_hdr *)resp->pktlog_msg.payload;
2001
2002                 trace_ath10k_htt_pktlog(ar, resp->pktlog_msg.payload,
2003                                         sizeof(*hdr) +
2004                                         __le16_to_cpu(hdr->size));
2005                 break;
2006         }
2007         case HTT_T2H_MSG_TYPE_RX_FLUSH: {
2008                 /* Ignore this event because mac80211 takes care of Rx
2009                  * aggregation reordering.
2010                  */
2011                 break;
2012         }
2013         case HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND: {
2014                 spin_lock_bh(&htt->rx_ring.lock);
2015                 __skb_queue_tail(&htt->rx_in_ord_compl_q, skb);
2016                 spin_unlock_bh(&htt->rx_ring.lock);
2017                 tasklet_schedule(&htt->txrx_compl_task);
2018                 return;
2019         }
2020         case HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND:
2021                 /* FIXME: This WMI-TLV event is overlapping with 10.2
2022                  * CHAN_CHANGE - both being 0xF. Neither is being used in
2023                  * practice so no immediate action is necessary. Nevertheless
2024                  * HTT may need an abstraction layer like WMI has one day.
2025                  */
2026                 break;
2027         default:
2028                 ath10k_warn(ar, "htt event (%d) not handled\n",
2029                             resp->hdr.msg_type);
2030                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2031                                 skb->data, skb->len);
2032                 break;
2033         };
2034
2035         /* Free the indication buffer */
2036         dev_kfree_skb_any(skb);
2037 }
2038
2039 static void ath10k_htt_txrx_compl_task(unsigned long ptr)
2040 {
2041         struct ath10k_htt *htt = (struct ath10k_htt *)ptr;
2042         struct ath10k *ar = htt->ar;
2043         struct htt_resp *resp;
2044         struct sk_buff *skb;
2045
2046         spin_lock_bh(&htt->tx_lock);
2047         while ((skb = __skb_dequeue(&htt->tx_compl_q))) {
2048                 ath10k_htt_rx_frm_tx_compl(htt->ar, skb);
2049                 dev_kfree_skb_any(skb);
2050         }
2051         spin_unlock_bh(&htt->tx_lock);
2052
2053         spin_lock_bh(&htt->rx_ring.lock);
2054         while ((skb = __skb_dequeue(&htt->rx_compl_q))) {
2055                 resp = (struct htt_resp *)skb->data;
2056                 ath10k_htt_rx_handler(htt, &resp->rx_ind);
2057                 dev_kfree_skb_any(skb);
2058         }
2059
2060         while ((skb = __skb_dequeue(&htt->rx_in_ord_compl_q))) {
2061                 ath10k_htt_rx_in_ord_ind(ar, skb);
2062                 dev_kfree_skb_any(skb);
2063         }
2064         spin_unlock_bh(&htt->rx_ring.lock);
2065 }