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.common.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.common.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_KERNEL);
 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_KERNEL);
 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 amsdu_subframe_hdr {
 641         u8 dst[ETH_ALEN];
 642         u8 src[ETH_ALEN];
 643         __be16 len;
 644 } __packed;
 645
 646 #define GROUP_ID_IS_SU_MIMO(x) ((x) == 0 || (x) == 63)
 647
 648 static void ath10k_htt_rx_h_rates(struct ath10k *ar,
 649                                   struct ieee80211_rx_status *status,
 650                                   struct htt_rx_desc *rxd)
 651 {
 652         struct ieee80211_supported_band *sband;
 653         u8 cck, rate, bw, sgi, mcs, nss;
 654         u8 preamble = 0;
 655         u8 group_id;
 656         u32 info1, info2, info3;
 657
 658         info1 = __le32_to_cpu(rxd->ppdu_start.info1);
 659         info2 = __le32_to_cpu(rxd->ppdu_start.info2);
 660         info3 = __le32_to_cpu(rxd->ppdu_start.info3);
 661
 662         preamble = MS(info1, RX_PPDU_START_INFO1_PREAMBLE_TYPE);
 663
 664         switch (preamble) {
 665         case HTT_RX_LEGACY:
 666                 /* To get legacy rate index band is required. Since band can't
 667                  * be undefined check if freq is non-zero.
 668                  */
 669                 if (!status->freq)
 670                         return;
 671
 672                 cck = info1 & RX_PPDU_START_INFO1_L_SIG_RATE_SELECT;
 673                 rate = MS(info1, RX_PPDU_START_INFO1_L_SIG_RATE);
 674                 rate &= ~RX_PPDU_START_RATE_FLAG;
 675
 676                 sband = &ar->mac.sbands[status->band];
 677                 status->rate_idx = ath10k_mac_hw_rate_to_idx(sband, rate, cck);
 678                 break;
 679         case HTT_RX_HT:
 680         case HTT_RX_HT_WITH_TXBF:
 681                 /* HT-SIG - Table 20-11 in info2 and info3 */
 682                 mcs = info2 & 0x1F;
 683                 nss = mcs >> 3;
 684                 bw = (info2 >> 7) & 1;
 685                 sgi = (info3 >> 7) & 1;
 686
 687                 status->rate_idx = mcs;
 688                 status->flag |= RX_FLAG_HT;
 689                 if (sgi)
 690                         status->flag |= RX_FLAG_SHORT_GI;
 691                 if (bw)
 692                         status->flag |= RX_FLAG_40MHZ;
 693                 break;
 694         case HTT_RX_VHT:
 695         case HTT_RX_VHT_WITH_TXBF:
 696                 /* VHT-SIG-A1 in info2, VHT-SIG-A2 in info3
 697                    TODO check this */
 698                 bw = info2 & 3;
 699                 sgi = info3 & 1;
 700                 group_id = (info2 >> 4) & 0x3F;
 701
 702                 if (GROUP_ID_IS_SU_MIMO(group_id)) {
 703                         mcs = (info3 >> 4) & 0x0F;
 704                         nss = ((info2 >> 10) & 0x07) + 1;
 705                 } else {
 706                         /* Hardware doesn't decode VHT-SIG-B into Rx descriptor
 707                          * so it's impossible to decode MCS. Also since
 708                          * firmware consumes Group Id Management frames host
 709                          * has no knowledge regarding group/user position
 710                          * mapping so it's impossible to pick the correct Nsts
 711                          * from VHT-SIG-A1.
 712                          *
 713                          * Bandwidth and SGI are valid so report the rateinfo
 714                          * on best-effort basis.
 715                          */
 716                         mcs = 0;
 717                         nss = 1;
 718                 }
 719
 720                 if (mcs > 0x09) {
 721                         ath10k_warn(ar, "invalid MCS received %u\n", mcs);
 722                         ath10k_warn(ar, "rxd %08x mpdu start %08x %08x msdu start %08x %08x ppdu start %08x %08x %08x %08x %08x\n",
 723                                     __le32_to_cpu(rxd->attention.flags),
 724                                     __le32_to_cpu(rxd->mpdu_start.info0),
 725                                     __le32_to_cpu(rxd->mpdu_start.info1),
 726                                     __le32_to_cpu(rxd->msdu_start.common.info0),
 727                                     __le32_to_cpu(rxd->msdu_start.common.info1),
 728                                     rxd->ppdu_start.info0,
 729                                     __le32_to_cpu(rxd->ppdu_start.info1),
 730                                     __le32_to_cpu(rxd->ppdu_start.info2),
 731                                     __le32_to_cpu(rxd->ppdu_start.info3),
 732                                     __le32_to_cpu(rxd->ppdu_start.info4));
 733
 734                         ath10k_warn(ar, "msdu end %08x mpdu end %08x\n",
 735                                     __le32_to_cpu(rxd->msdu_end.common.info0),
 736                                     __le32_to_cpu(rxd->mpdu_end.info0));
 737
 738                         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL,
 739                                         "rx desc msdu payload: ",
 740                                         rxd->msdu_payload, 50);
 741                 }
 742
 743                 status->rate_idx = mcs;
 744                 status->vht_nss = nss;
 745
 746                 if (sgi)
 747                         status->flag |= RX_FLAG_SHORT_GI;
 748
 749                 switch (bw) {
 750                 /* 20MHZ */
 751                 case 0:
 752                         break;
 753                 /* 40MHZ */
 754                 case 1:
 755                         status->flag |= RX_FLAG_40MHZ;
 756                         break;
 757                 /* 80MHZ */
 758                 case 2:
 759                         status->vht_flag |= RX_VHT_FLAG_80MHZ;
 760                 }
 761
 762                 status->flag |= RX_FLAG_VHT;
 763                 break;
 764         default:
 765                 break;
 766         }
 767 }
 768
 769 static struct ieee80211_channel *
 770 ath10k_htt_rx_h_peer_channel(struct ath10k *ar, struct htt_rx_desc *rxd)
 771 {
 772         struct ath10k_peer *peer;
 773         struct ath10k_vif *arvif;
 774         struct cfg80211_chan_def def;
 775         u16 peer_id;
 776
 777         lockdep_assert_held(&ar->data_lock);
 778
 779         if (!rxd)
 780                 return NULL;
 781
 782         if (rxd->attention.flags &
 783             __cpu_to_le32(RX_ATTENTION_FLAGS_PEER_IDX_INVALID))
 784                 return NULL;
 785
 786         if (!(rxd->msdu_end.common.info0 &
 787               __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU)))
 788                 return NULL;
 789
 790         peer_id = MS(__le32_to_cpu(rxd->mpdu_start.info0),
 791                      RX_MPDU_START_INFO0_PEER_IDX);
 792
 793         peer = ath10k_peer_find_by_id(ar, peer_id);
 794         if (!peer)
 795                 return NULL;
 796
 797         arvif = ath10k_get_arvif(ar, peer->vdev_id);
 798         if (WARN_ON_ONCE(!arvif))
 799                 return NULL;
 800
 801         if (WARN_ON(ath10k_mac_vif_chan(arvif->vif, &def)))
 802                 return NULL;
 803
 804         return def.chan;
 805 }
 806
 807 static struct ieee80211_channel *
 808 ath10k_htt_rx_h_vdev_channel(struct ath10k *ar, u32 vdev_id)
 809 {
 810         struct ath10k_vif *arvif;
 811         struct cfg80211_chan_def def;
 812
 813         lockdep_assert_held(&ar->data_lock);
 814
 815         list_for_each_entry(arvif, &ar->arvifs, list) {
 816                 if (arvif->vdev_id == vdev_id &&
 817                     ath10k_mac_vif_chan(arvif->vif, &def) == 0)
 818                         return def.chan;
 819         }
 820
 821         return NULL;
 822 }
 823
 824 static void
 825 ath10k_htt_rx_h_any_chan_iter(struct ieee80211_hw *hw,
 826                               struct ieee80211_chanctx_conf *conf,
 827                               void *data)
 828 {
 829         struct cfg80211_chan_def *def = data;
 830
 831         *def = conf->def;
 832 }
 833
 834 static struct ieee80211_channel *
 835 ath10k_htt_rx_h_any_channel(struct ath10k *ar)
 836 {
 837         struct cfg80211_chan_def def = {};
 838
 839         ieee80211_iter_chan_contexts_atomic(ar->hw,
 840                                             ath10k_htt_rx_h_any_chan_iter,
 841                                             &def);
 842
 843         return def.chan;
 844 }
 845
 846 static bool ath10k_htt_rx_h_channel(struct ath10k *ar,
 847                                     struct ieee80211_rx_status *status,
 848                                     struct htt_rx_desc *rxd,
 849                                     u32 vdev_id)
 850 {
 851         struct ieee80211_channel *ch;
 852
 853         spin_lock_bh(&ar->data_lock);
 854         ch = ar->scan_channel;
 855         if (!ch)
 856                 ch = ar->rx_channel;
 857         if (!ch)
 858                 ch = ath10k_htt_rx_h_peer_channel(ar, rxd);
 859         if (!ch)
 860                 ch = ath10k_htt_rx_h_vdev_channel(ar, vdev_id);
 861         if (!ch)
 862                 ch = ath10k_htt_rx_h_any_channel(ar);
 863         spin_unlock_bh(&ar->data_lock);
 864
 865         if (!ch)
 866                 return false;
 867
 868         status->band = ch->band;
 869         status->freq = ch->center_freq;
 870
 871         return true;
 872 }
 873
 874 static void ath10k_htt_rx_h_signal(struct ath10k *ar,
 875                                    struct ieee80211_rx_status *status,
 876                                    struct htt_rx_desc *rxd)
 877 {
 878         /* FIXME: Get real NF */
 879         status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
 880                          rxd->ppdu_start.rssi_comb;
 881         status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
 882 }
 883
 884 static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
 885                                     struct ieee80211_rx_status *status,
 886                                     struct htt_rx_desc *rxd)
 887 {
 888         /* FIXME: TSF is known only at the end of PPDU, in the last MPDU. This
 889          * means all prior MSDUs in a PPDU are reported to mac80211 without the
 890          * TSF. Is it worth holding frames until end of PPDU is known?
 891          *
 892          * FIXME: Can we get/compute 64bit TSF?
 893          */
 894         status->mactime = __le32_to_cpu(rxd->ppdu_end.common.tsf_timestamp);
 895         status->flag |= RX_FLAG_MACTIME_END;
 896 }
 897
 898 static void ath10k_htt_rx_h_ppdu(struct ath10k *ar,
 899                                  struct sk_buff_head *amsdu,
 900                                  struct ieee80211_rx_status *status,
 901                                  u32 vdev_id)
 902 {
 903         struct sk_buff *first;
 904         struct htt_rx_desc *rxd;
 905         bool is_first_ppdu;
 906         bool is_last_ppdu;
 907
 908         if (skb_queue_empty(amsdu))
 909                 return;
 910
 911         first = skb_peek(amsdu);
 912         rxd = (void *)first->data - sizeof(*rxd);
 913
 914         is_first_ppdu = !!(rxd->attention.flags &
 915                            __cpu_to_le32(RX_ATTENTION_FLAGS_FIRST_MPDU));
 916         is_last_ppdu = !!(rxd->attention.flags &
 917                           __cpu_to_le32(RX_ATTENTION_FLAGS_LAST_MPDU));
 918
 919         if (is_first_ppdu) {
 920                 /* New PPDU starts so clear out the old per-PPDU status. */
 921                 status->freq = 0;
 922                 status->rate_idx = 0;
 923                 status->vht_nss = 0;
 924                 status->vht_flag &= ~RX_VHT_FLAG_80MHZ;
 925                 status->flag &= ~(RX_FLAG_HT |
 926                                   RX_FLAG_VHT |
 927                                   RX_FLAG_SHORT_GI |
 928                                   RX_FLAG_40MHZ |
 929                                   RX_FLAG_MACTIME_END);
 930                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 931
 932                 ath10k_htt_rx_h_signal(ar, status, rxd);
 933                 ath10k_htt_rx_h_channel(ar, status, rxd, vdev_id);
 934                 ath10k_htt_rx_h_rates(ar, status, rxd);
 935         }
 936
 937         if (is_last_ppdu)
 938                 ath10k_htt_rx_h_mactime(ar, status, rxd);
 939 }
 940
 941 static const char * const tid_to_ac[] = {
 942         "BE",
 943         "BK",
 944         "BK",
 945         "BE",
 946         "VI",
 947         "VI",
 948         "VO",
 949         "VO",
 950 };
 951
 952 static char *ath10k_get_tid(struct ieee80211_hdr *hdr, char *out, size_t size)
 953 {
 954         u8 *qc;
 955         int tid;
 956
 957         if (!ieee80211_is_data_qos(hdr->frame_control))
 958                 return "";
 959
 960         qc = ieee80211_get_qos_ctl(hdr);
 961         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 962         if (tid < 8)
 963                 snprintf(out, size, "tid %d (%s)", tid, tid_to_ac[tid]);
 964         else
 965                 snprintf(out, size, "tid %d", tid);
 966
 967         return out;
 968 }
 969
 970 static void ath10k_process_rx(struct ath10k *ar,
 971                               struct ieee80211_rx_status *rx_status,
 972                               struct sk_buff *skb)
 973 {
 974         struct ieee80211_rx_status *status;
 975         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 976         char tid[32];
 977
 978         status = IEEE80211_SKB_RXCB(skb);
 979         *status = *rx_status;
 980
 981         ath10k_dbg(ar, ATH10K_DBG_DATA,
 982                    "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",
 983                    skb,
 984                    skb->len,
 985                    ieee80211_get_SA(hdr),
 986                    ath10k_get_tid(hdr, tid, sizeof(tid)),
 987                    is_multicast_ether_addr(ieee80211_get_DA(hdr)) ?
 988                                                         "mcast" : "ucast",
 989                    (__le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4,
 990                    status->flag == 0 ? "legacy" : "",
 991                    status->flag & RX_FLAG_HT ? "ht" : "",
 992                    status->flag & RX_FLAG_VHT ? "vht" : "",
 993                    status->flag & RX_FLAG_40MHZ ? "40" : "",
 994                    status->vht_flag & RX_VHT_FLAG_80MHZ ? "80" : "",
 995                    status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
 996                    status->rate_idx,
 997                    status->vht_nss,
 998                    status->freq,
 999                    status->band, status->flag,
1000                    !!(status->flag & RX_FLAG_FAILED_FCS_CRC),
1001                    !!(status->flag & RX_FLAG_MMIC_ERROR),
1002                    !!(status->flag & RX_FLAG_AMSDU_MORE));
1003         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
1004                         skb->data, skb->len);
1005         trace_ath10k_rx_hdr(ar, skb->data, skb->len);
1006         trace_ath10k_rx_payload(ar, skb->data, skb->len);
1007
1008         ieee80211_rx(ar->hw, skb);
1009 }
1010
1011 static int ath10k_htt_rx_nwifi_hdrlen(struct ath10k *ar,
1012                                       struct ieee80211_hdr *hdr)
1013 {
1014         int len = ieee80211_hdrlen(hdr->frame_control);
1015
1016         if (!test_bit(ATH10K_FW_FEATURE_NO_NWIFI_DECAP_4ADDR_PADDING,
1017                       ar->fw_features))
1018                 len = round_up(len, 4);
1019
1020         return len;
1021 }
1022
1023 static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
1024                                         struct sk_buff *msdu,
1025                                         struct ieee80211_rx_status *status,
1026                                         enum htt_rx_mpdu_encrypt_type enctype,
1027                                         bool is_decrypted)
1028 {
1029         struct ieee80211_hdr *hdr;
1030         struct htt_rx_desc *rxd;
1031         size_t hdr_len;
1032         size_t crypto_len;
1033         bool is_first;
1034         bool is_last;
1035
1036         rxd = (void *)msdu->data - sizeof(*rxd);
1037         is_first = !!(rxd->msdu_end.common.info0 &
1038                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1039         is_last = !!(rxd->msdu_end.common.info0 &
1040                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
1041
1042         /* Delivered decapped frame:
1043          * [802.11 header]
1044          * [crypto param] <-- can be trimmed if !fcs_err &&
1045          *                    !decrypt_err && !peer_idx_invalid
1046          * [amsdu header] <-- only if A-MSDU
1047          * [rfc1042/llc]
1048          * [payload]
1049          * [FCS] <-- at end, needs to be trimmed
1050          */
1051
1052         /* This probably shouldn't happen but warn just in case */
1053         if (unlikely(WARN_ON_ONCE(!is_first)))
1054                 return;
1055
1056         /* This probably shouldn't happen but warn just in case */
1057         if (unlikely(WARN_ON_ONCE(!(is_first && is_last))))
1058                 return;
1059
1060         skb_trim(msdu, msdu->len - FCS_LEN);
1061
1062         /* In most cases this will be true for sniffed frames. It makes sense
1063          * to deliver them as-is without stripping the crypto param. This is
1064          * necessary for software based decryption.
1065          *
1066          * If there's no error then the frame is decrypted. At least that is
1067          * the case for frames that come in via fragmented rx indication.
1068          */
1069         if (!is_decrypted)
1070                 return;
1071
1072         /* The payload is decrypted so strip crypto params. Start from tail
1073          * since hdr is used to compute some stuff.
1074          */
1075
1076         hdr = (void *)msdu->data;
1077
1078         /* Tail */
1079         skb_trim(msdu, msdu->len - ath10k_htt_rx_crypto_tail_len(ar, enctype));
1080
1081         /* MMIC */
1082         if (!ieee80211_has_morefrags(hdr->frame_control) &&
1083             enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
1084                 skb_trim(msdu, msdu->len - 8);
1085
1086         /* Head */
1087         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1088         crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1089
1090         memmove((void *)msdu->data + crypto_len,
1091                 (void *)msdu->data, hdr_len);
1092         skb_pull(msdu, crypto_len);
1093 }
1094
1095 static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
1096                                           struct sk_buff *msdu,
1097                                           struct ieee80211_rx_status *status,
1098                                           const u8 first_hdr[64])
1099 {
1100         struct ieee80211_hdr *hdr;
1101         size_t hdr_len;
1102         u8 da[ETH_ALEN];
1103         u8 sa[ETH_ALEN];
1104
1105         /* Delivered decapped frame:
1106          * [nwifi 802.11 header] <-- replaced with 802.11 hdr
1107          * [rfc1042/llc]
1108          *
1109          * Note: The nwifi header doesn't have QoS Control and is
1110          * (always?) a 3addr frame.
1111          *
1112          * Note2: There's no A-MSDU subframe header. Even if it's part
1113          * of an A-MSDU.
1114          */
1115
1116         /* pull decapped header and copy SA & DA */
1117         if ((ar->hw_params.hw_4addr_pad == ATH10K_HW_4ADDR_PAD_BEFORE) &&
1118             ieee80211_has_a4(((struct ieee80211_hdr *)first_hdr)->frame_control)) {
1119                 /* The QCA99X0 4 address mode pad 2 bytes at the
1120                  * beginning of MSDU
1121                  */
1122                 hdr = (struct ieee80211_hdr *)(msdu->data + 2);
1123                 /* The skb length need be extended 2 as the 2 bytes at the tail
1124                  * be excluded due to the padding
1125                  */
1126                 skb_put(msdu, 2);
1127         } else {
1128                 hdr = (struct ieee80211_hdr *)(msdu->data);
1129         }
1130
1131         hdr_len = ath10k_htt_rx_nwifi_hdrlen(ar, hdr);
1132         ether_addr_copy(da, ieee80211_get_DA(hdr));
1133         ether_addr_copy(sa, ieee80211_get_SA(hdr));
1134         skb_pull(msdu, hdr_len);
1135
1136         /* push original 802.11 header */
1137         hdr = (struct ieee80211_hdr *)first_hdr;
1138         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1139         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1140
1141         /* original 802.11 header has a different DA and in
1142          * case of 4addr it may also have different SA
1143          */
1144         hdr = (struct ieee80211_hdr *)msdu->data;
1145         ether_addr_copy(ieee80211_get_DA(hdr), da);
1146         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1147 }
1148
1149 static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar,
1150                                           struct sk_buff *msdu,
1151                                           enum htt_rx_mpdu_encrypt_type enctype)
1152 {
1153         struct ieee80211_hdr *hdr;
1154         struct htt_rx_desc *rxd;
1155         size_t hdr_len, crypto_len;
1156         void *rfc1042;
1157         bool is_first, is_last, is_amsdu;
1158
1159         rxd = (void *)msdu->data - sizeof(*rxd);
1160         hdr = (void *)rxd->rx_hdr_status;
1161
1162         is_first = !!(rxd->msdu_end.common.info0 &
1163                       __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1164         is_last = !!(rxd->msdu_end.common.info0 &
1165                      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
1166         is_amsdu = !(is_first && is_last);
1167
1168         rfc1042 = hdr;
1169
1170         if (is_first) {
1171                 hdr_len = ieee80211_hdrlen(hdr->frame_control);
1172                 crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1173
1174                 rfc1042 += round_up(hdr_len, 4) +
1175                            round_up(crypto_len, 4);
1176         }
1177
1178         if (is_amsdu)
1179                 rfc1042 += sizeof(struct amsdu_subframe_hdr);
1180
1181         return rfc1042;
1182 }
1183
1184 static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
1185                                         struct sk_buff *msdu,
1186                                         struct ieee80211_rx_status *status,
1187                                         const u8 first_hdr[64],
1188                                         enum htt_rx_mpdu_encrypt_type enctype)
1189 {
1190         struct ieee80211_hdr *hdr;
1191         struct ethhdr *eth;
1192         size_t hdr_len;
1193         void *rfc1042;
1194         u8 da[ETH_ALEN];
1195         u8 sa[ETH_ALEN];
1196
1197         /* Delivered decapped frame:
1198          * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
1199          * [payload]
1200          */
1201
1202         rfc1042 = ath10k_htt_rx_h_find_rfc1042(ar, msdu, enctype);
1203         if (WARN_ON_ONCE(!rfc1042))
1204                 return;
1205
1206         /* pull decapped header and copy SA & DA */
1207         eth = (struct ethhdr *)msdu->data;
1208         ether_addr_copy(da, eth->h_dest);
1209         ether_addr_copy(sa, eth->h_source);
1210         skb_pull(msdu, sizeof(struct ethhdr));
1211
1212         /* push rfc1042/llc/snap */
1213         memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042,
1214                sizeof(struct rfc1042_hdr));
1215
1216         /* push original 802.11 header */
1217         hdr = (struct ieee80211_hdr *)first_hdr;
1218         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1219         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1220
1221         /* original 802.11 header has a different DA and in
1222          * case of 4addr it may also have different SA
1223          */
1224         hdr = (struct ieee80211_hdr *)msdu->data;
1225         ether_addr_copy(ieee80211_get_DA(hdr), da);
1226         ether_addr_copy(ieee80211_get_SA(hdr), sa);
1227 }
1228
1229 static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
1230                                          struct sk_buff *msdu,
1231                                          struct ieee80211_rx_status *status,
1232                                          const u8 first_hdr[64])
1233 {
1234         struct ieee80211_hdr *hdr;
1235         size_t hdr_len;
1236
1237         /* Delivered decapped frame:
1238          * [amsdu header] <-- replaced with 802.11 hdr
1239          * [rfc1042/llc]
1240          * [payload]
1241          */
1242
1243         skb_pull(msdu, sizeof(struct amsdu_subframe_hdr));
1244
1245         hdr = (struct ieee80211_hdr *)first_hdr;
1246         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1247         memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1248 }
1249
1250 static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
1251                                     struct sk_buff *msdu,
1252                                     struct ieee80211_rx_status *status,
1253                                     u8 first_hdr[64],
1254                                     enum htt_rx_mpdu_encrypt_type enctype,
1255                                     bool is_decrypted)
1256 {
1257         struct htt_rx_desc *rxd;
1258         enum rx_msdu_decap_format decap;
1259
1260         /* First msdu's decapped header:
1261          * [802.11 header] <-- padded to 4 bytes long
1262          * [crypto param] <-- padded to 4 bytes long
1263          * [amsdu header] <-- only if A-MSDU
1264          * [rfc1042/llc]
1265          *
1266          * Other (2nd, 3rd, ..) msdu's decapped header:
1267          * [amsdu header] <-- only if A-MSDU
1268          * [rfc1042/llc]
1269          */
1270
1271         rxd = (void *)msdu->data - sizeof(*rxd);
1272         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1273                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1274
1275         switch (decap) {
1276         case RX_MSDU_DECAP_RAW:
1277                 ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype,
1278                                             is_decrypted);
1279                 break;
1280         case RX_MSDU_DECAP_NATIVE_WIFI:
1281                 ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
1282                 break;
1283         case RX_MSDU_DECAP_ETHERNET2_DIX:
1284                 ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
1285                 break;
1286         case RX_MSDU_DECAP_8023_SNAP_LLC:
1287                 ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
1288                 break;
1289         }
1290 }
1291
1292 static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
1293 {
1294         struct htt_rx_desc *rxd;
1295         u32 flags, info;
1296         bool is_ip4, is_ip6;
1297         bool is_tcp, is_udp;
1298         bool ip_csum_ok, tcpudp_csum_ok;
1299
1300         rxd = (void *)skb->data - sizeof(*rxd);
1301         flags = __le32_to_cpu(rxd->attention.flags);
1302         info = __le32_to_cpu(rxd->msdu_start.common.info1);
1303
1304         is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
1305         is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
1306         is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
1307         is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
1308         ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
1309         tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);
1310
1311         if (!is_ip4 && !is_ip6)
1312                 return CHECKSUM_NONE;
1313         if (!is_tcp && !is_udp)
1314                 return CHECKSUM_NONE;
1315         if (!ip_csum_ok)
1316                 return CHECKSUM_NONE;
1317         if (!tcpudp_csum_ok)
1318                 return CHECKSUM_NONE;
1319
1320         return CHECKSUM_UNNECESSARY;
1321 }
1322
1323 static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
1324 {
1325         msdu->ip_summed = ath10k_htt_rx_get_csum_state(msdu);
1326 }
1327
1328 static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
1329                                  struct sk_buff_head *amsdu,
1330                                  struct ieee80211_rx_status *status)
1331 {
1332         struct sk_buff *first;
1333         struct sk_buff *last;
1334         struct sk_buff *msdu;
1335         struct htt_rx_desc *rxd;
1336         struct ieee80211_hdr *hdr;
1337         enum htt_rx_mpdu_encrypt_type enctype;
1338         u8 first_hdr[64];
1339         u8 *qos;
1340         size_t hdr_len;
1341         bool has_fcs_err;
1342         bool has_crypto_err;
1343         bool has_tkip_err;
1344         bool has_peer_idx_invalid;
1345         bool is_decrypted;
1346         u32 attention;
1347
1348         if (skb_queue_empty(amsdu))
1349                 return;
1350
1351         first = skb_peek(amsdu);
1352         rxd = (void *)first->data - sizeof(*rxd);
1353
1354         enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
1355                      RX_MPDU_START_INFO0_ENCRYPT_TYPE);
1356
1357         /* First MSDU's Rx descriptor in an A-MSDU contains full 802.11
1358          * decapped header. It'll be used for undecapping of each MSDU.
1359          */
1360         hdr = (void *)rxd->rx_hdr_status;
1361         hdr_len = ieee80211_hdrlen(hdr->frame_control);
1362         memcpy(first_hdr, hdr, hdr_len);
1363
1364         /* Each A-MSDU subframe will use the original header as the base and be
1365          * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
1366          */
1367         hdr = (void *)first_hdr;
1368         qos = ieee80211_get_qos_ctl(hdr);
1369         qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
1370
1371         /* Some attention flags are valid only in the last MSDU. */
1372         last = skb_peek_tail(amsdu);
1373         rxd = (void *)last->data - sizeof(*rxd);
1374         attention = __le32_to_cpu(rxd->attention.flags);
1375
1376         has_fcs_err = !!(attention & RX_ATTENTION_FLAGS_FCS_ERR);
1377         has_crypto_err = !!(attention & RX_ATTENTION_FLAGS_DECRYPT_ERR);
1378         has_tkip_err = !!(attention & RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
1379         has_peer_idx_invalid = !!(attention & RX_ATTENTION_FLAGS_PEER_IDX_INVALID);
1380
1381         /* Note: If hardware captures an encrypted frame that it can't decrypt,
1382          * e.g. due to fcs error, missing peer or invalid key data it will
1383          * report the frame as raw.
1384          */
1385         is_decrypted = (enctype != HTT_RX_MPDU_ENCRYPT_NONE &&
1386                         !has_fcs_err &&
1387                         !has_crypto_err &&
1388                         !has_peer_idx_invalid);
1389
1390         /* Clear per-MPDU flags while leaving per-PPDU flags intact. */
1391         status->flag &= ~(RX_FLAG_FAILED_FCS_CRC |
1392                           RX_FLAG_MMIC_ERROR |
1393                           RX_FLAG_DECRYPTED |
1394                           RX_FLAG_IV_STRIPPED |
1395                           RX_FLAG_MMIC_STRIPPED);
1396
1397         if (has_fcs_err)
1398                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
1399
1400         if (has_tkip_err)
1401                 status->flag |= RX_FLAG_MMIC_ERROR;
1402
1403         if (is_decrypted)
1404                 status->flag |= RX_FLAG_DECRYPTED |
1405                                 RX_FLAG_IV_STRIPPED |
1406                                 RX_FLAG_MMIC_STRIPPED;
1407
1408         skb_queue_walk(amsdu, msdu) {
1409                 ath10k_htt_rx_h_csum_offload(msdu);
1410                 ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
1411                                         is_decrypted);
1412
1413                 /* Undecapping involves copying the original 802.11 header back
1414                  * to sk_buff. If frame is protected and hardware has decrypted
1415                  * it then remove the protected bit.
1416                  */
1417                 if (!is_decrypted)
1418                         continue;
1419
1420                 hdr = (void *)msdu->data;
1421                 hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1422         }
1423 }
1424
1425 static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
1426                                     struct sk_buff_head *amsdu,
1427                                     struct ieee80211_rx_status *status)
1428 {
1429         struct sk_buff *msdu;
1430
1431         while ((msdu = __skb_dequeue(amsdu))) {
1432                 /* Setup per-MSDU flags */
1433                 if (skb_queue_empty(amsdu))
1434                         status->flag &= ~RX_FLAG_AMSDU_MORE;
1435                 else
1436                         status->flag |= RX_FLAG_AMSDU_MORE;
1437
1438                 ath10k_process_rx(ar, status, msdu);
1439         }
1440 }
1441
1442 static int ath10k_unchain_msdu(struct sk_buff_head *amsdu)
1443 {
1444         struct sk_buff *skb, *first;
1445         int space;
1446         int total_len = 0;
1447
1448         /* TODO:  Might could optimize this by using
1449          * skb_try_coalesce or similar method to
1450          * decrease copying, or maybe get mac80211 to
1451          * provide a way to just receive a list of
1452          * skb?
1453          */
1454
1455         first = __skb_dequeue(amsdu);
1456
1457         /* Allocate total length all at once. */
1458         skb_queue_walk(amsdu, skb)
1459                 total_len += skb->len;
1460
1461         space = total_len - skb_tailroom(first);
1462         if ((space > 0) &&
1463             (pskb_expand_head(first, 0, space, GFP_ATOMIC) < 0)) {
1464                 /* TODO:  bump some rx-oom error stat */
1465                 /* put it back together so we can free the
1466                  * whole list at once.
1467                  */
1468                 __skb_queue_head(amsdu, first);
1469                 return -1;
1470         }
1471
1472         /* Walk list again, copying contents into
1473          * msdu_head
1474          */
1475         while ((skb = __skb_dequeue(amsdu))) {
1476                 skb_copy_from_linear_data(skb, skb_put(first, skb->len),
1477                                           skb->len);
1478                 dev_kfree_skb_any(skb);
1479         }
1480
1481         __skb_queue_head(amsdu, first);
1482         return 0;
1483 }
1484
1485 static void ath10k_htt_rx_h_unchain(struct ath10k *ar,
1486                                     struct sk_buff_head *amsdu,
1487                                     bool chained)
1488 {
1489         struct sk_buff *first;
1490         struct htt_rx_desc *rxd;
1491         enum rx_msdu_decap_format decap;
1492
1493         first = skb_peek(amsdu);
1494         rxd = (void *)first->data - sizeof(*rxd);
1495         decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
1496                    RX_MSDU_START_INFO1_DECAP_FORMAT);
1497
1498         if (!chained)
1499                 return;
1500
1501         /* FIXME: Current unchaining logic can only handle simple case of raw
1502          * msdu chaining. If decapping is other than raw the chaining may be
1503          * more complex and this isn't handled by the current code. Don't even
1504          * try re-constructing such frames - it'll be pretty much garbage.
1505          */
1506         if (decap != RX_MSDU_DECAP_RAW ||
1507             skb_queue_len(amsdu) != 1 + rxd->frag_info.ring2_more_count) {
1508                 __skb_queue_purge(amsdu);
1509                 return;
1510         }
1511
1512         ath10k_unchain_msdu(amsdu);
1513 }
1514
1515 static bool ath10k_htt_rx_amsdu_allowed(struct ath10k *ar,
1516                                         struct sk_buff_head *amsdu,
1517                                         struct ieee80211_rx_status *rx_status)
1518 {
1519         struct sk_buff *msdu;
1520         struct htt_rx_desc *rxd;
1521         bool is_mgmt;
1522         bool has_fcs_err;
1523
1524         msdu = skb_peek(amsdu);
1525         rxd = (void *)msdu->data - sizeof(*rxd);
1526
1527         /* FIXME: It might be a good idea to do some fuzzy-testing to drop
1528          * invalid/dangerous frames.
1529          */
1530
1531         if (!rx_status->freq) {
1532                 ath10k_warn(ar, "no channel configured; ignoring frame(s)!\n");
1533                 return false;
1534         }
1535
1536         is_mgmt = !!(rxd->attention.flags &
1537                      __cpu_to_le32(RX_ATTENTION_FLAGS_MGMT_TYPE));
1538         has_fcs_err = !!(rxd->attention.flags &
1539                          __cpu_to_le32(RX_ATTENTION_FLAGS_FCS_ERR));
1540
1541         /* Management frames are handled via WMI events. The pros of such
1542          * approach is that channel is explicitly provided in WMI events
1543          * whereas HTT doesn't provide channel information for Rxed frames.
1544          *
1545          * However some firmware revisions don't report corrupted frames via
1546          * WMI so don't drop them.
1547          */
1548         if (is_mgmt && !has_fcs_err) {
1549                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx mgmt ctrl\n");
1550                 return false;
1551         }
1552
1553         if (test_bit(ATH10K_CAC_RUNNING, &ar->dev_flags)) {
1554                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx cac running\n");
1555                 return false;
1556         }
1557
1558         return true;
1559 }
1560
1561 static void ath10k_htt_rx_h_filter(struct ath10k *ar,
1562                                    struct sk_buff_head *amsdu,
1563                                    struct ieee80211_rx_status *rx_status)
1564 {
1565         if (skb_queue_empty(amsdu))
1566                 return;
1567
1568         if (ath10k_htt_rx_amsdu_allowed(ar, amsdu, rx_status))
1569                 return;
1570
1571         __skb_queue_purge(amsdu);
1572 }
1573
1574 static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
1575                                   struct htt_rx_indication *rx)
1576 {
1577         struct ath10k *ar = htt->ar;
1578         struct ieee80211_rx_status *rx_status = &htt->rx_status;
1579         struct htt_rx_indication_mpdu_range *mpdu_ranges;
1580         struct sk_buff_head amsdu;
1581         int num_mpdu_ranges;
1582         int fw_desc_len;
1583         u8 *fw_desc;
1584         int i, ret, mpdu_count = 0;
1585
1586         lockdep_assert_held(&htt->rx_ring.lock);
1587
1588         if (htt->rx_confused)
1589                 return;
1590
1591         fw_desc_len = __le16_to_cpu(rx->prefix.fw_rx_desc_bytes);
1592         fw_desc = (u8 *)&rx->fw_desc;
1593
1594         num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
1595                              HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
1596         mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
1597
1598         ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
1599                         rx, sizeof(*rx) +
1600                         (sizeof(struct htt_rx_indication_mpdu_range) *
1601                                 num_mpdu_ranges));
1602
1603         for (i = 0; i < num_mpdu_ranges; i++)
1604                 mpdu_count += mpdu_ranges[i].mpdu_count;
1605
1606         while (mpdu_count--) {
1607                 __skb_queue_head_init(&amsdu);
1608                 ret = ath10k_htt_rx_amsdu_pop(htt, &fw_desc,
1609                                               &fw_desc_len, &amsdu);
1610                 if (ret < 0) {
1611                         ath10k_warn(ar, "rx ring became corrupted: %d\n", ret);
1612                         __skb_queue_purge(&amsdu);
1613                         /* FIXME: It's probably a good idea to reboot the
1614                          * device instead of leaving it inoperable.
1615                          */
1616                         htt->rx_confused = true;
1617                         break;
1618                 }
1619
1620                 ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status, 0xffff);
1621                 ath10k_htt_rx_h_unchain(ar, &amsdu, ret > 0);
1622                 ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
1623                 ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
1624                 ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1625         }
1626
1627         tasklet_schedule(&htt->rx_replenish_task);
1628 }
1629
1630 static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,
1631                                        struct htt_rx_fragment_indication *frag)
1632 {
1633         struct ath10k *ar = htt->ar;
1634         struct ieee80211_rx_status *rx_status = &htt->rx_status;
1635         struct sk_buff_head amsdu;
1636         int ret;
1637         u8 *fw_desc;
1638         int fw_desc_len;
1639
1640         fw_desc_len = __le16_to_cpu(frag->fw_rx_desc_bytes);
1641         fw_desc = (u8 *)frag->fw_msdu_rx_desc;
1642
1643         __skb_queue_head_init(&amsdu);
1644
1645         spin_lock_bh(&htt->rx_ring.lock);
1646         ret = ath10k_htt_rx_amsdu_pop(htt, &fw_desc, &fw_desc_len,
1647                                       &amsdu);
1648         spin_unlock_bh(&htt->rx_ring.lock);
1649
1650         tasklet_schedule(&htt->rx_replenish_task);
1651
1652         ath10k_dbg(ar, ATH10K_DBG_HTT_DUMP, "htt rx frag ahead\n");
1653
1654         if (ret) {
1655                 ath10k_warn(ar, "failed to pop amsdu from httr rx ring for fragmented rx %d\n",
1656                             ret);
1657                 __skb_queue_purge(&amsdu);
1658                 return;
1659         }
1660
1661         if (skb_queue_len(&amsdu) != 1) {
1662                 ath10k_warn(ar, "failed to pop frag amsdu: too many msdus\n");
1663                 __skb_queue_purge(&amsdu);
1664                 return;
1665         }
1666
1667         ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status, 0xffff);
1668         ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
1669         ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
1670         ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1671
1672         if (fw_desc_len > 0) {
1673                 ath10k_dbg(ar, ATH10K_DBG_HTT,
1674                            "expecting more fragmented rx in one indication %d\n",
1675                            fw_desc_len);
1676         }
1677 }
1678
1679 static void ath10k_htt_rx_frm_tx_compl(struct ath10k *ar,
1680                                        struct sk_buff *skb)
1681 {
1682         struct ath10k_htt *htt = &ar->htt;
1683         struct htt_resp *resp = (struct htt_resp *)skb->data;
1684         struct htt_tx_done tx_done = {};
1685         int status = MS(resp->data_tx_completion.flags, HTT_DATA_TX_STATUS);
1686         __le16 msdu_id;
1687         int i;
1688
1689         switch (status) {
1690         case HTT_DATA_TX_STATUS_NO_ACK:
1691                 tx_done.no_ack = true;
1692                 break;
1693         case HTT_DATA_TX_STATUS_OK:
1694                 tx_done.success = true;
1695                 break;
1696         case HTT_DATA_TX_STATUS_DISCARD:
1697         case HTT_DATA_TX_STATUS_POSTPONE:
1698         case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
1699                 tx_done.discard = true;
1700                 break;
1701         default:
1702                 ath10k_warn(ar, "unhandled tx completion status %d\n", status);
1703                 tx_done.discard = true;
1704                 break;
1705         }
1706
1707         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
1708                    resp->data_tx_completion.num_msdus);
1709
1710         for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
1711                 msdu_id = resp->data_tx_completion.msdus[i];
1712                 tx_done.msdu_id = __le16_to_cpu(msdu_id);
1713                 ath10k_txrx_tx_unref(htt, &tx_done);
1714         }
1715 }
1716
1717 static void ath10k_htt_rx_addba(struct ath10k *ar, struct htt_resp *resp)
1718 {
1719         struct htt_rx_addba *ev = &resp->rx_addba;
1720         struct ath10k_peer *peer;
1721         struct ath10k_vif *arvif;
1722         u16 info0, tid, peer_id;
1723
1724         info0 = __le16_to_cpu(ev->info0);
1725         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1726         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1727
1728         ath10k_dbg(ar, ATH10K_DBG_HTT,
1729                    "htt rx addba tid %hu peer_id %hu size %hhu\n",
1730                    tid, peer_id, ev->window_size);
1731
1732         spin_lock_bh(&ar->data_lock);
1733         peer = ath10k_peer_find_by_id(ar, peer_id);
1734         if (!peer) {
1735                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1736                             peer_id);
1737                 spin_unlock_bh(&ar->data_lock);
1738                 return;
1739         }
1740
1741         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1742         if (!arvif) {
1743                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1744                             peer->vdev_id);
1745                 spin_unlock_bh(&ar->data_lock);
1746                 return;
1747         }
1748
1749         ath10k_dbg(ar, ATH10K_DBG_HTT,
1750                    "htt rx start rx ba session sta %pM tid %hu size %hhu\n",
1751                    peer->addr, tid, ev->window_size);
1752
1753         ieee80211_start_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1754         spin_unlock_bh(&ar->data_lock);
1755 }
1756
1757 static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
1758 {
1759         struct htt_rx_delba *ev = &resp->rx_delba;
1760         struct ath10k_peer *peer;
1761         struct ath10k_vif *arvif;
1762         u16 info0, tid, peer_id;
1763
1764         info0 = __le16_to_cpu(ev->info0);
1765         tid = MS(info0, HTT_RX_BA_INFO0_TID);
1766         peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
1767
1768         ath10k_dbg(ar, ATH10K_DBG_HTT,
1769                    "htt rx delba tid %hu peer_id %hu\n",
1770                    tid, peer_id);
1771
1772         spin_lock_bh(&ar->data_lock);
1773         peer = ath10k_peer_find_by_id(ar, peer_id);
1774         if (!peer) {
1775                 ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1776                             peer_id);
1777                 spin_unlock_bh(&ar->data_lock);
1778                 return;
1779         }
1780
1781         arvif = ath10k_get_arvif(ar, peer->vdev_id);
1782         if (!arvif) {
1783                 ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1784                             peer->vdev_id);
1785                 spin_unlock_bh(&ar->data_lock);
1786                 return;
1787         }
1788
1789         ath10k_dbg(ar, ATH10K_DBG_HTT,
1790                    "htt rx stop rx ba session sta %pM tid %hu\n",
1791                    peer->addr, tid);
1792
1793         ieee80211_stop_rx_ba_session_offl(arvif->vif, peer->addr, tid);
1794         spin_unlock_bh(&ar->data_lock);
1795 }
1796
1797 static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
1798                                        struct sk_buff_head *amsdu)
1799 {
1800         struct sk_buff *msdu;
1801         struct htt_rx_desc *rxd;
1802
1803         if (skb_queue_empty(list))
1804                 return -ENOBUFS;
1805
1806         if (WARN_ON(!skb_queue_empty(amsdu)))
1807                 return -EINVAL;
1808
1809         while ((msdu = __skb_dequeue(list))) {
1810                 __skb_queue_tail(amsdu, msdu);
1811
1812                 rxd = (void *)msdu->data - sizeof(*rxd);
1813                 if (rxd->msdu_end.common.info0 &
1814                     __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))
1815                         break;
1816         }
1817
1818         msdu = skb_peek_tail(amsdu);
1819         rxd = (void *)msdu->data - sizeof(*rxd);
1820         if (!(rxd->msdu_end.common.info0 &
1821               __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))) {
1822                 skb_queue_splice_init(amsdu, list);
1823                 return -EAGAIN;
1824         }
1825
1826         return 0;
1827 }
1828
1829 static void ath10k_htt_rx_h_rx_offload_prot(struct ieee80211_rx_status *status,
1830                                             struct sk_buff *skb)
1831 {
1832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1833
1834         if (!ieee80211_has_protected(hdr->frame_control))
1835                 return;
1836
1837         /* Offloaded frames are already decrypted but firmware insists they are
1838          * protected in the 802.11 header. Strip the flag.  Otherwise mac80211
1839          * will drop the frame.
1840          */
1841
1842         hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1843         status->flag |= RX_FLAG_DECRYPTED |
1844                         RX_FLAG_IV_STRIPPED |
1845                         RX_FLAG_MMIC_STRIPPED;
1846 }
1847
1848 static void ath10k_htt_rx_h_rx_offload(struct ath10k *ar,
1849                                        struct sk_buff_head *list)
1850 {
1851         struct ath10k_htt *htt = &ar->htt;
1852         struct ieee80211_rx_status *status = &htt->rx_status;
1853         struct htt_rx_offload_msdu *rx;
1854         struct sk_buff *msdu;
1855         size_t offset;
1856
1857         while ((msdu = __skb_dequeue(list))) {
1858                 /* Offloaded frames don't have Rx descriptor. Instead they have
1859                  * a short meta information header.
1860                  */
1861
1862                 rx = (void *)msdu->data;
1863
1864                 skb_put(msdu, sizeof(*rx));
1865                 skb_pull(msdu, sizeof(*rx));
1866
1867                 if (skb_tailroom(msdu) < __le16_to_cpu(rx->msdu_len)) {
1868                         ath10k_warn(ar, "dropping frame: offloaded rx msdu is too long!\n");
1869                         dev_kfree_skb_any(msdu);
1870                         continue;
1871                 }
1872
1873                 skb_put(msdu, __le16_to_cpu(rx->msdu_len));
1874
1875                 /* Offloaded rx header length isn't multiple of 2 nor 4 so the
1876                  * actual payload is unaligned. Align the frame.  Otherwise
1877                  * mac80211 complains.  This shouldn't reduce performance much
1878                  * because these offloaded frames are rare.
1879                  */
1880                 offset = 4 - ((unsigned long)msdu->data & 3);
1881                 skb_put(msdu, offset);
1882                 memmove(msdu->data + offset, msdu->data, msdu->len);
1883                 skb_pull(msdu, offset);
1884
1885                 /* FIXME: The frame is NWifi. Re-construct QoS Control
1886                  * if possible later.
1887                  */
1888
1889                 memset(status, 0, sizeof(*status));
1890                 status->flag |= RX_FLAG_NO_SIGNAL_VAL;
1891
1892                 ath10k_htt_rx_h_rx_offload_prot(status, msdu);
1893                 ath10k_htt_rx_h_channel(ar, status, NULL, rx->vdev_id);
1894                 ath10k_process_rx(ar, status, msdu);
1895         }
1896 }
1897
1898 static void ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
1899 {
1900         struct ath10k_htt *htt = &ar->htt;
1901         struct htt_resp *resp = (void *)skb->data;
1902         struct ieee80211_rx_status *status = &htt->rx_status;
1903         struct sk_buff_head list;
1904         struct sk_buff_head amsdu;
1905         u16 peer_id;
1906         u16 msdu_count;
1907         u8 vdev_id;
1908         u8 tid;
1909         bool offload;
1910         bool frag;
1911         int ret;
1912
1913         lockdep_assert_held(&htt->rx_ring.lock);
1914
1915         if (htt->rx_confused)
1916                 return;
1917
1918         skb_pull(skb, sizeof(resp->hdr));
1919         skb_pull(skb, sizeof(resp->rx_in_ord_ind));
1920
1921         peer_id = __le16_to_cpu(resp->rx_in_ord_ind.peer_id);
1922         msdu_count = __le16_to_cpu(resp->rx_in_ord_ind.msdu_count);
1923         vdev_id = resp->rx_in_ord_ind.vdev_id;
1924         tid = SM(resp->rx_in_ord_ind.info, HTT_RX_IN_ORD_IND_INFO_TID);
1925         offload = !!(resp->rx_in_ord_ind.info &
1926                         HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
1927         frag = !!(resp->rx_in_ord_ind.info & HTT_RX_IN_ORD_IND_INFO_FRAG_MASK);
1928
1929         ath10k_dbg(ar, ATH10K_DBG_HTT,
1930                    "htt rx in ord vdev %i peer %i tid %i offload %i frag %i msdu count %i\n",
1931                    vdev_id, peer_id, tid, offload, frag, msdu_count);
1932
1933         if (skb->len < msdu_count * sizeof(*resp->rx_in_ord_ind.msdu_descs)) {
1934                 ath10k_warn(ar, "dropping invalid in order rx indication\n");
1935                 return;
1936         }
1937
1938         /* The event can deliver more than 1 A-MSDU. Each A-MSDU is later
1939          * extracted and processed.
1940          */
1941         __skb_queue_head_init(&list);
1942         ret = ath10k_htt_rx_pop_paddr_list(htt, &resp->rx_in_ord_ind, &list);
1943         if (ret < 0) {
1944                 ath10k_warn(ar, "failed to pop paddr list: %d\n", ret);
1945                 htt->rx_confused = true;
1946                 return;
1947         }
1948
1949         /* Offloaded frames are very different and need to be handled
1950          * separately.
1951          */
1952         if (offload)
1953                 ath10k_htt_rx_h_rx_offload(ar, &list);
1954
1955         while (!skb_queue_empty(&list)) {
1956                 __skb_queue_head_init(&amsdu);
1957                 ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
1958                 switch (ret) {
1959                 case 0:
1960                         /* Note: The in-order indication may report interleaved
1961                          * frames from different PPDUs meaning reported rx rate
1962                          * to mac80211 isn't accurate/reliable. It's still
1963                          * better to report something than nothing though. This
1964                          * should still give an idea about rx rate to the user.
1965                          */
1966                         ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
1967                         ath10k_htt_rx_h_filter(ar, &amsdu, status);
1968                         ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
1969                         ath10k_htt_rx_h_deliver(ar, &amsdu, status);
1970                         break;
1971                 case -EAGAIN:
1972                         /* fall through */
1973                 default:
1974                         /* Should not happen. */
1975                         ath10k_warn(ar, "failed to extract amsdu: %d\n", ret);
1976                         htt->rx_confused = true;
1977                         __skb_queue_purge(&list);
1978                         return;
1979                 }
1980         }
1981
1982         tasklet_schedule(&htt->rx_replenish_task);
1983 }
1984
1985 void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
1986 {
1987         struct ath10k_htt *htt = &ar->htt;
1988         struct htt_resp *resp = (struct htt_resp *)skb->data;
1989         enum htt_t2h_msg_type type;
1990
1991         /* confirm alignment */
1992         if (!IS_ALIGNED((unsigned long)skb->data, 4))
1993                 ath10k_warn(ar, "unaligned htt message, expect trouble\n");
1994
1995         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, msg_type: 0x%0X\n",
1996                    resp->hdr.msg_type);
1997
1998         if (resp->hdr.msg_type >= ar->htt.t2h_msg_types_max) {
1999                 ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, unsupported msg_type: 0x%0X\n max: 0x%0X",
2000                            resp->hdr.msg_type, ar->htt.t2h_msg_types_max);
2001                 dev_kfree_skb_any(skb);
2002                 return;
2003         }
2004         type = ar->htt.t2h_msg_types[resp->hdr.msg_type];
2005
2006         switch (type) {
2007         case HTT_T2H_MSG_TYPE_VERSION_CONF: {
2008                 htt->target_version_major = resp->ver_resp.major;
2009                 htt->target_version_minor = resp->ver_resp.minor;
2010                 complete(&htt->target_version_received);
2011                 break;
2012         }
2013         case HTT_T2H_MSG_TYPE_RX_IND:
2014                 skb_queue_tail(&htt->rx_compl_q, skb);
2015                 tasklet_schedule(&htt->txrx_compl_task);
2016                 return;
2017         case HTT_T2H_MSG_TYPE_PEER_MAP: {
2018                 struct htt_peer_map_event ev = {
2019                         .vdev_id = resp->peer_map.vdev_id,
2020                         .peer_id = __le16_to_cpu(resp->peer_map.peer_id),
2021                 };
2022                 memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
2023                 ath10k_peer_map_event(htt, &ev);
2024                 break;
2025         }
2026         case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
2027                 struct htt_peer_unmap_event ev = {
2028                         .peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
2029                 };
2030                 ath10k_peer_unmap_event(htt, &ev);
2031                 break;
2032         }
2033         case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
2034                 struct htt_tx_done tx_done = {};
2035                 int status = __le32_to_cpu(resp->mgmt_tx_completion.status);
2036
2037                 tx_done.msdu_id =
2038                         __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
2039
2040                 switch (status) {
2041                 case HTT_MGMT_TX_STATUS_OK:
2042                         tx_done.success = true;
2043                         break;
2044                 case HTT_MGMT_TX_STATUS_RETRY:
2045                         tx_done.no_ack = true;
2046                         break;
2047                 case HTT_MGMT_TX_STATUS_DROP:
2048                         tx_done.discard = true;
2049                         break;
2050                 }
2051
2052                 ath10k_txrx_tx_unref(htt, &tx_done);
2053                 break;
2054         }
2055         case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
2056                 skb_queue_tail(&htt->tx_compl_q, skb);
2057                 tasklet_schedule(&htt->txrx_compl_task);
2058                 return;
2059         case HTT_T2H_MSG_TYPE_SEC_IND: {
2060                 struct ath10k *ar = htt->ar;
2061                 struct htt_security_indication *ev = &resp->security_indication;
2062
2063                 ath10k_dbg(ar, ATH10K_DBG_HTT,
2064                            "sec ind peer_id %d unicast %d type %d\n",
2065                           __le16_to_cpu(ev->peer_id),
2066                           !!(ev->flags & HTT_SECURITY_IS_UNICAST),
2067                           MS(ev->flags, HTT_SECURITY_TYPE));
2068                 complete(&ar->install_key_done);
2069                 break;
2070         }
2071         case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
2072                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2073                                 skb->data, skb->len);
2074                 ath10k_htt_rx_frag_handler(htt, &resp->rx_frag_ind);
2075                 break;
2076         }
2077         case HTT_T2H_MSG_TYPE_TEST:
2078                 break;
2079         case HTT_T2H_MSG_TYPE_STATS_CONF:
2080                 trace_ath10k_htt_stats(ar, skb->data, skb->len);
2081                 break;
2082         case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
2083                 /* Firmware can return tx frames if it's unable to fully
2084                  * process them and suspects host may be able to fix it. ath10k
2085                  * sends all tx frames as already inspected so this shouldn't
2086                  * happen unless fw has a bug.
2087                  */
2088                 ath10k_warn(ar, "received an unexpected htt tx inspect event\n");
2089                 break;
2090         case HTT_T2H_MSG_TYPE_RX_ADDBA:
2091                 ath10k_htt_rx_addba(ar, resp);
2092                 break;
2093         case HTT_T2H_MSG_TYPE_RX_DELBA:
2094                 ath10k_htt_rx_delba(ar, resp);
2095                 break;
2096         case HTT_T2H_MSG_TYPE_PKTLOG: {
2097                 struct ath10k_pktlog_hdr *hdr =
2098                         (struct ath10k_pktlog_hdr *)resp->pktlog_msg.payload;
2099
2100                 trace_ath10k_htt_pktlog(ar, resp->pktlog_msg.payload,
2101                                         sizeof(*hdr) +
2102                                         __le16_to_cpu(hdr->size));
2103                 break;
2104         }
2105         case HTT_T2H_MSG_TYPE_RX_FLUSH: {
2106                 /* Ignore this event because mac80211 takes care of Rx
2107                  * aggregation reordering.
2108                  */
2109                 break;
2110         }
2111         case HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND: {
2112                 skb_queue_tail(&htt->rx_in_ord_compl_q, skb);
2113                 tasklet_schedule(&htt->txrx_compl_task);
2114                 return;
2115         }
2116         case HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND:
2117                 break;
2118         case HTT_T2H_MSG_TYPE_CHAN_CHANGE:
2119                 break;
2120         case HTT_T2H_MSG_TYPE_AGGR_CONF:
2121                 break;
2122         case HTT_T2H_MSG_TYPE_TX_FETCH_IND:
2123         case HTT_T2H_MSG_TYPE_TX_FETCH_CONFIRM:
2124         case HTT_T2H_MSG_TYPE_TX_MODE_SWITCH_IND:
2125                 /* TODO: Implement pull-push logic */
2126                 break;
2127         case HTT_T2H_MSG_TYPE_EN_STATS:
2128         default:
2129                 ath10k_warn(ar, "htt event (%d) not handled\n",
2130                             resp->hdr.msg_type);
2131                 ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2132                                 skb->data, skb->len);
2133                 break;
2134         };
2135
2136         /* Free the indication buffer */
2137         dev_kfree_skb_any(skb);
2138 }
2139 EXPORT_SYMBOL(ath10k_htt_t2h_msg_handler);
2140
2141 void ath10k_htt_rx_pktlog_completion_handler(struct ath10k *ar,
2142                                              struct sk_buff *skb)
2143 {
2144         trace_ath10k_htt_pktlog(ar, skb->data, skb->len);
2145         dev_kfree_skb_any(skb);
2146 }
2147 EXPORT_SYMBOL(ath10k_htt_rx_pktlog_completion_handler);
2148
2149 static void ath10k_htt_txrx_compl_task(unsigned long ptr)
2150 {
2151         struct ath10k_htt *htt = (struct ath10k_htt *)ptr;
2152         struct ath10k *ar = htt->ar;
2153         struct sk_buff_head tx_q;
2154         struct sk_buff_head rx_q;
2155         struct sk_buff_head rx_ind_q;
2156         struct htt_resp *resp;
2157         struct sk_buff *skb;
2158         unsigned long flags;
2159
2160         __skb_queue_head_init(&tx_q);
2161         __skb_queue_head_init(&rx_q);
2162         __skb_queue_head_init(&rx_ind_q);
2163
2164         spin_lock_irqsave(&htt->tx_compl_q.lock, flags);
2165         skb_queue_splice_init(&htt->tx_compl_q, &tx_q);
2166         spin_unlock_irqrestore(&htt->tx_compl_q.lock, flags);
2167
2168         spin_lock_irqsave(&htt->rx_compl_q.lock, flags);
2169         skb_queue_splice_init(&htt->rx_compl_q, &rx_q);
2170         spin_unlock_irqrestore(&htt->rx_compl_q.lock, flags);
2171
2172         spin_lock_irqsave(&htt->rx_in_ord_compl_q.lock, flags);
2173         skb_queue_splice_init(&htt->rx_in_ord_compl_q, &rx_ind_q);
2174         spin_unlock_irqrestore(&htt->rx_in_ord_compl_q.lock, flags);
2175
2176         while ((skb = __skb_dequeue(&tx_q))) {
2177                 ath10k_htt_rx_frm_tx_compl(htt->ar, skb);
2178                 dev_kfree_skb_any(skb);
2179         }
2180
2181         while ((skb = __skb_dequeue(&rx_q))) {
2182                 resp = (struct htt_resp *)skb->data;
2183                 spin_lock_bh(&htt->rx_ring.lock);
2184                 ath10k_htt_rx_handler(htt, &resp->rx_ind);
2185                 spin_unlock_bh(&htt->rx_ring.lock);
2186                 dev_kfree_skb_any(skb);
2187         }
2188
2189         while ((skb = __skb_dequeue(&rx_ind_q))) {
2190                 spin_lock_bh(&htt->rx_ring.lock);
2191                 ath10k_htt_rx_in_ord_ind(ar, skb);
2192                 spin_unlock_bh(&htt->rx_ring.lock);
2193                 dev_kfree_skb_any(skb);
2194         }
2195 }