htt_rx.c 66.2 KB
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/*
 * Copyright (c) 2005-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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#include "core.h"
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#include "htc.h"
#include "htt.h"
#include "txrx.h"
#include "debug.h"
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#include "trace.h"
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#include "mac.h"
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#include <linux/log2.h>

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#define HTT_RX_RING_SIZE HTT_RX_RING_SIZE_MAX
#define HTT_RX_RING_FILL_LEVEL (((HTT_RX_RING_SIZE) / 2) - 1)
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/* when under memory pressure rx ring refill may fail and needs a retry */
#define HTT_RX_RING_REFILL_RETRY_MS 50

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#define HTT_RX_RING_REFILL_RESCHED_MS 5

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static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb);

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static struct sk_buff *
ath10k_htt_rx_find_skb_paddr(struct ath10k *ar, u32 paddr)
{
	struct ath10k_skb_rxcb *rxcb;

	hash_for_each_possible(ar->htt.rx_ring.skb_table, rxcb, hlist, paddr)
		if (rxcb->paddr == paddr)
			return ATH10K_RXCB_SKB(rxcb);

	WARN_ON_ONCE(1);
	return NULL;
}

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static void ath10k_htt_rx_ring_free(struct ath10k_htt *htt)
{
	struct sk_buff *skb;
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	struct ath10k_skb_rxcb *rxcb;
	struct hlist_node *n;
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	int i;

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	if (htt->rx_ring.in_ord_rx) {
		hash_for_each_safe(htt->rx_ring.skb_table, i, n, rxcb, hlist) {
			skb = ATH10K_RXCB_SKB(rxcb);
			dma_unmap_single(htt->ar->dev, rxcb->paddr,
					 skb->len + skb_tailroom(skb),
					 DMA_FROM_DEVICE);
			hash_del(&rxcb->hlist);
			dev_kfree_skb_any(skb);
		}
	} else {
		for (i = 0; i < htt->rx_ring.size; i++) {
			skb = htt->rx_ring.netbufs_ring[i];
			if (!skb)
				continue;

			rxcb = ATH10K_SKB_RXCB(skb);
			dma_unmap_single(htt->ar->dev, rxcb->paddr,
					 skb->len + skb_tailroom(skb),
					 DMA_FROM_DEVICE);
			dev_kfree_skb_any(skb);
		}
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	}

	htt->rx_ring.fill_cnt = 0;
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	hash_init(htt->rx_ring.skb_table);
	memset(htt->rx_ring.netbufs_ring, 0,
	       htt->rx_ring.size * sizeof(htt->rx_ring.netbufs_ring[0]));
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}

static int __ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
{
	struct htt_rx_desc *rx_desc;
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	struct ath10k_skb_rxcb *rxcb;
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	struct sk_buff *skb;
	dma_addr_t paddr;
	int ret = 0, idx;

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	/* The Full Rx Reorder firmware has no way of telling the host
	 * implicitly when it copied HTT Rx Ring buffers to MAC Rx Ring.
	 * To keep things simple make sure ring is always half empty. This
	 * guarantees there'll be no replenishment overruns possible.
	 */
	BUILD_BUG_ON(HTT_RX_RING_FILL_LEVEL >= HTT_RX_RING_SIZE / 2);

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	idx = __le32_to_cpu(*htt->rx_ring.alloc_idx.vaddr);
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	while (num > 0) {
		skb = dev_alloc_skb(HTT_RX_BUF_SIZE + HTT_RX_DESC_ALIGN);
		if (!skb) {
			ret = -ENOMEM;
			goto fail;
		}

		if (!IS_ALIGNED((unsigned long)skb->data, HTT_RX_DESC_ALIGN))
			skb_pull(skb,
				 PTR_ALIGN(skb->data, HTT_RX_DESC_ALIGN) -
				 skb->data);

		/* Clear rx_desc attention word before posting to Rx ring */
		rx_desc = (struct htt_rx_desc *)skb->data;
		rx_desc->attention.flags = __cpu_to_le32(0);

		paddr = dma_map_single(htt->ar->dev, skb->data,
				       skb->len + skb_tailroom(skb),
				       DMA_FROM_DEVICE);

		if (unlikely(dma_mapping_error(htt->ar->dev, paddr))) {
			dev_kfree_skb_any(skb);
			ret = -ENOMEM;
			goto fail;
		}

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		rxcb = ATH10K_SKB_RXCB(skb);
		rxcb->paddr = paddr;
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		htt->rx_ring.netbufs_ring[idx] = skb;
		htt->rx_ring.paddrs_ring[idx] = __cpu_to_le32(paddr);
		htt->rx_ring.fill_cnt++;

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		if (htt->rx_ring.in_ord_rx) {
			hash_add(htt->rx_ring.skb_table,
				 &ATH10K_SKB_RXCB(skb)->hlist,
				 (u32)paddr);
		}

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		num--;
		idx++;
		idx &= htt->rx_ring.size_mask;
	}

fail:
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	/*
	 * Make sure the rx buffer is updated before available buffer
	 * index to avoid any potential rx ring corruption.
	 */
	mb();
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	*htt->rx_ring.alloc_idx.vaddr = __cpu_to_le32(idx);
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	return ret;
}

static int ath10k_htt_rx_ring_fill_n(struct ath10k_htt *htt, int num)
{
	lockdep_assert_held(&htt->rx_ring.lock);
	return __ath10k_htt_rx_ring_fill_n(htt, num);
}

static void ath10k_htt_rx_msdu_buff_replenish(struct ath10k_htt *htt)
{
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	int ret, num_deficit, num_to_fill;
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	/* Refilling the whole RX ring buffer proves to be a bad idea. The
	 * reason is RX may take up significant amount of CPU cycles and starve
	 * other tasks, e.g. TX on an ethernet device while acting as a bridge
	 * with ath10k wlan interface. This ended up with very poor performance
	 * once CPU the host system was overwhelmed with RX on ath10k.
	 *
	 * By limiting the number of refills the replenishing occurs
	 * progressively. This in turns makes use of the fact tasklets are
	 * processed in FIFO order. This means actual RX processing can starve
	 * out refilling. If there's not enough buffers on RX ring FW will not
	 * report RX until it is refilled with enough buffers. This
	 * automatically balances load wrt to CPU power.
	 *
	 * This probably comes at a cost of lower maximum throughput but
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	 * improves the average and stability. */
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	spin_lock_bh(&htt->rx_ring.lock);
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	num_deficit = htt->rx_ring.fill_level - htt->rx_ring.fill_cnt;
	num_to_fill = min(ATH10K_HTT_MAX_NUM_REFILL, num_deficit);
	num_deficit -= num_to_fill;
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	ret = ath10k_htt_rx_ring_fill_n(htt, num_to_fill);
	if (ret == -ENOMEM) {
		/*
		 * Failed to fill it to the desired level -
		 * we'll start a timer and try again next time.
		 * As long as enough buffers are left in the ring for
		 * another A-MPDU rx, no special recovery is needed.
		 */
		mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
			  msecs_to_jiffies(HTT_RX_RING_REFILL_RETRY_MS));
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	} else if (num_deficit > 0) {
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		mod_timer(&htt->rx_ring.refill_retry_timer, jiffies +
			  msecs_to_jiffies(HTT_RX_RING_REFILL_RESCHED_MS));
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	}
	spin_unlock_bh(&htt->rx_ring.lock);
}

static void ath10k_htt_rx_ring_refill_retry(unsigned long arg)
{
	struct ath10k_htt *htt = (struct ath10k_htt *)arg;
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	ath10k_htt_rx_msdu_buff_replenish(htt);
}

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int ath10k_htt_rx_ring_refill(struct ath10k *ar)
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{
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	struct ath10k_htt *htt = &ar->htt;
	int ret;
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	spin_lock_bh(&htt->rx_ring.lock);
	ret = ath10k_htt_rx_ring_fill_n(htt, (htt->rx_ring.fill_level -
					      htt->rx_ring.fill_cnt));
	spin_unlock_bh(&htt->rx_ring.lock);
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	if (ret)
		ath10k_htt_rx_ring_free(htt);

	return ret;
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}
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void ath10k_htt_rx_free(struct ath10k_htt *htt)
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{
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	del_timer_sync(&htt->rx_ring.refill_retry_timer);
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	skb_queue_purge(&htt->rx_compl_q);
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	skb_queue_purge(&htt->rx_in_ord_compl_q);
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	skb_queue_purge(&htt->tx_fetch_ind_q);
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	ath10k_htt_rx_ring_free(htt);
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	dma_free_coherent(htt->ar->dev,
			  (htt->rx_ring.size *
			   sizeof(htt->rx_ring.paddrs_ring)),
			  htt->rx_ring.paddrs_ring,
			  htt->rx_ring.base_paddr);

	dma_free_coherent(htt->ar->dev,
			  sizeof(*htt->rx_ring.alloc_idx.vaddr),
			  htt->rx_ring.alloc_idx.vaddr,
			  htt->rx_ring.alloc_idx.paddr);

	kfree(htt->rx_ring.netbufs_ring);
}

static inline struct sk_buff *ath10k_htt_rx_netbuf_pop(struct ath10k_htt *htt)
{
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	struct ath10k *ar = htt->ar;
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	int idx;
	struct sk_buff *msdu;

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	lockdep_assert_held(&htt->rx_ring.lock);
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	if (htt->rx_ring.fill_cnt == 0) {
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		ath10k_warn(ar, "tried to pop sk_buff from an empty rx ring\n");
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		return NULL;
	}
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	idx = htt->rx_ring.sw_rd_idx.msdu_payld;
	msdu = htt->rx_ring.netbufs_ring[idx];
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	htt->rx_ring.netbufs_ring[idx] = NULL;
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	htt->rx_ring.paddrs_ring[idx] = 0;
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	idx++;
	idx &= htt->rx_ring.size_mask;
	htt->rx_ring.sw_rd_idx.msdu_payld = idx;
	htt->rx_ring.fill_cnt--;

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	dma_unmap_single(htt->ar->dev,
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			 ATH10K_SKB_RXCB(msdu)->paddr,
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			 msdu->len + skb_tailroom(msdu),
			 DMA_FROM_DEVICE);
	ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
			msdu->data, msdu->len + skb_tailroom(msdu));

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	return msdu;
}

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/* return: < 0 fatal error, 0 - non chained msdu, 1 chained msdu */
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static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
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				   struct sk_buff_head *amsdu)
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{
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	struct ath10k *ar = htt->ar;
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	int msdu_len, msdu_chaining = 0;
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	struct sk_buff *msdu;
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	struct htt_rx_desc *rx_desc;

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	lockdep_assert_held(&htt->rx_ring.lock);

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	for (;;) {
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		int last_msdu, msdu_len_invalid, msdu_chained;

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		msdu = ath10k_htt_rx_netbuf_pop(htt);
		if (!msdu) {
			__skb_queue_purge(amsdu);
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			return -ENOENT;
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		}

		__skb_queue_tail(amsdu, msdu);

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		rx_desc = (struct htt_rx_desc *)msdu->data;

		/* FIXME: we must report msdu payload since this is what caller
		 *        expects now */
		skb_put(msdu, offsetof(struct htt_rx_desc, msdu_payload));
		skb_pull(msdu, offsetof(struct htt_rx_desc, msdu_payload));

		/*
		 * Sanity check - confirm the HW is finished filling in the
		 * rx data.
		 * If the HW and SW are working correctly, then it's guaranteed
		 * that the HW's MAC DMA is done before this point in the SW.
		 * To prevent the case that we handle a stale Rx descriptor,
		 * just assert for now until we have a way to recover.
		 */
		if (!(__le32_to_cpu(rx_desc->attention.flags)
				& RX_ATTENTION_FLAGS_MSDU_DONE)) {
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			__skb_queue_purge(amsdu);
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			return -EIO;
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		}

		msdu_len_invalid = !!(__le32_to_cpu(rx_desc->attention.flags)
					& (RX_ATTENTION_FLAGS_MPDU_LENGTH_ERR |
					   RX_ATTENTION_FLAGS_MSDU_LENGTH_ERR));
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		msdu_len = MS(__le32_to_cpu(rx_desc->msdu_start.common.info0),
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			      RX_MSDU_START_INFO0_MSDU_LENGTH);
		msdu_chained = rx_desc->frag_info.ring2_more_count;

		if (msdu_len_invalid)
			msdu_len = 0;

		skb_trim(msdu, 0);
		skb_put(msdu, min(msdu_len, HTT_RX_MSDU_SIZE));
		msdu_len -= msdu->len;

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		/* Note: Chained buffers do not contain rx descriptor */
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		while (msdu_chained--) {
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			msdu = ath10k_htt_rx_netbuf_pop(htt);
			if (!msdu) {
				__skb_queue_purge(amsdu);
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				return -ENOENT;
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			}

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			__skb_queue_tail(amsdu, msdu);
			skb_trim(msdu, 0);
			skb_put(msdu, min(msdu_len, HTT_RX_BUF_SIZE));
			msdu_len -= msdu->len;
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			msdu_chaining = 1;
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		}

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		last_msdu = __le32_to_cpu(rx_desc->msdu_end.common.info0) &
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				RX_MSDU_END_INFO0_LAST_MSDU;

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		trace_ath10k_htt_rx_desc(ar, &rx_desc->attention,
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					 sizeof(*rx_desc) - sizeof(u32));
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		if (last_msdu)
			break;
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	}

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	if (skb_queue_empty(amsdu))
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		msdu_chaining = -1;

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	/*
	 * Don't refill the ring yet.
	 *
	 * First, the elements popped here are still in use - it is not
	 * safe to overwrite them until the matching call to
	 * mpdu_desc_list_next. Second, for efficiency it is preferable to
	 * refill the rx ring with 1 PPDU's worth of rx buffers (something
	 * like 32 x 3 buffers), rather than one MPDU's worth of rx buffers
	 * (something like 3 buffers). Consequently, we'll rely on the txrx
	 * SW to tell us when it is done pulling all the PPDU's rx buffers
	 * out of the rx ring, and then refill it just once.
	 */

	return msdu_chaining;
}

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static struct sk_buff *ath10k_htt_rx_pop_paddr(struct ath10k_htt *htt,
					       u32 paddr)
{
	struct ath10k *ar = htt->ar;
	struct ath10k_skb_rxcb *rxcb;
	struct sk_buff *msdu;

	lockdep_assert_held(&htt->rx_ring.lock);

	msdu = ath10k_htt_rx_find_skb_paddr(ar, paddr);
	if (!msdu)
		return NULL;

	rxcb = ATH10K_SKB_RXCB(msdu);
	hash_del(&rxcb->hlist);
	htt->rx_ring.fill_cnt--;

	dma_unmap_single(htt->ar->dev, rxcb->paddr,
			 msdu->len + skb_tailroom(msdu),
			 DMA_FROM_DEVICE);
	ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx netbuf pop: ",
			msdu->data, msdu->len + skb_tailroom(msdu));

	return msdu;
}

static int ath10k_htt_rx_pop_paddr_list(struct ath10k_htt *htt,
					struct htt_rx_in_ord_ind *ev,
					struct sk_buff_head *list)
{
	struct ath10k *ar = htt->ar;
	struct htt_rx_in_ord_msdu_desc *msdu_desc = ev->msdu_descs;
	struct htt_rx_desc *rxd;
	struct sk_buff *msdu;
	int msdu_count;
	bool is_offload;
	u32 paddr;

	lockdep_assert_held(&htt->rx_ring.lock);

	msdu_count = __le16_to_cpu(ev->msdu_count);
	is_offload = !!(ev->info & HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);

	while (msdu_count--) {
		paddr = __le32_to_cpu(msdu_desc->msdu_paddr);

		msdu = ath10k_htt_rx_pop_paddr(htt, paddr);
		if (!msdu) {
			__skb_queue_purge(list);
			return -ENOENT;
		}

		__skb_queue_tail(list, msdu);

		if (!is_offload) {
			rxd = (void *)msdu->data;

			trace_ath10k_htt_rx_desc(ar, rxd, sizeof(*rxd));

			skb_put(msdu, sizeof(*rxd));
			skb_pull(msdu, sizeof(*rxd));
			skb_put(msdu, __le16_to_cpu(msdu_desc->msdu_len));

			if (!(__le32_to_cpu(rxd->attention.flags) &
			      RX_ATTENTION_FLAGS_MSDU_DONE)) {
				ath10k_warn(htt->ar, "tried to pop an incomplete frame, oops!\n");
				return -EIO;
			}
		}

		msdu_desc++;
	}

	return 0;
}

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int ath10k_htt_rx_alloc(struct ath10k_htt *htt)
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{
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	struct ath10k *ar = htt->ar;
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	dma_addr_t paddr;
	void *vaddr;
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	size_t size;
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	struct timer_list *timer = &htt->rx_ring.refill_retry_timer;

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	htt->rx_confused = false;

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	/* XXX: The fill level could be changed during runtime in response to
	 * the host processing latency. Is this really worth it?
	 */
	htt->rx_ring.size = HTT_RX_RING_SIZE;
	htt->rx_ring.size_mask = htt->rx_ring.size - 1;
	htt->rx_ring.fill_level = HTT_RX_RING_FILL_LEVEL;

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	if (!is_power_of_2(htt->rx_ring.size)) {
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		ath10k_warn(ar, "htt rx ring size is not power of 2\n");
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		return -EINVAL;
	}

	htt->rx_ring.netbufs_ring =
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		kzalloc(htt->rx_ring.size * sizeof(struct sk_buff *),
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			GFP_KERNEL);
	if (!htt->rx_ring.netbufs_ring)
		goto err_netbuf;

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	size = htt->rx_ring.size * sizeof(htt->rx_ring.paddrs_ring);

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	vaddr = dma_alloc_coherent(htt->ar->dev, size, &paddr, GFP_KERNEL);
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	if (!vaddr)
		goto err_dma_ring;

	htt->rx_ring.paddrs_ring = vaddr;
	htt->rx_ring.base_paddr = paddr;

	vaddr = dma_alloc_coherent(htt->ar->dev,
				   sizeof(*htt->rx_ring.alloc_idx.vaddr),
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				   &paddr, GFP_KERNEL);
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	if (!vaddr)
		goto err_dma_idx;

	htt->rx_ring.alloc_idx.vaddr = vaddr;
	htt->rx_ring.alloc_idx.paddr = paddr;
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	htt->rx_ring.sw_rd_idx.msdu_payld = htt->rx_ring.size_mask;
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	*htt->rx_ring.alloc_idx.vaddr = 0;

	/* Initialize the Rx refill retry timer */
	setup_timer(timer, ath10k_htt_rx_ring_refill_retry, (unsigned long)htt);

	spin_lock_init(&htt->rx_ring.lock);

	htt->rx_ring.fill_cnt = 0;
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	htt->rx_ring.sw_rd_idx.msdu_payld = 0;
	hash_init(htt->rx_ring.skb_table);
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	skb_queue_head_init(&htt->rx_compl_q);
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	skb_queue_head_init(&htt->rx_in_ord_compl_q);
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	skb_queue_head_init(&htt->tx_fetch_ind_q);
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	atomic_set(&htt->num_mpdus_ready, 0);
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	ath10k_dbg(ar, ATH10K_DBG_BOOT, "htt rx ring size %d fill_level %d\n",
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		   htt->rx_ring.size, htt->rx_ring.fill_level);
	return 0;

err_dma_idx:
	dma_free_coherent(htt->ar->dev,
			  (htt->rx_ring.size *
			   sizeof(htt->rx_ring.paddrs_ring)),
			  htt->rx_ring.paddrs_ring,
			  htt->rx_ring.base_paddr);
err_dma_ring:
	kfree(htt->rx_ring.netbufs_ring);
err_netbuf:
	return -ENOMEM;
}

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static int ath10k_htt_rx_crypto_param_len(struct ath10k *ar,
					  enum htt_rx_mpdu_encrypt_type type)
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{
	switch (type) {
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	case HTT_RX_MPDU_ENCRYPT_NONE:
		return 0;
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	case HTT_RX_MPDU_ENCRYPT_WEP40:
	case HTT_RX_MPDU_ENCRYPT_WEP104:
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		return IEEE80211_WEP_IV_LEN;
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	case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
	case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
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		return IEEE80211_TKIP_IV_LEN;
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	case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
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		return IEEE80211_CCMP_HDR_LEN;
	case HTT_RX_MPDU_ENCRYPT_WEP128:
	case HTT_RX_MPDU_ENCRYPT_WAPI:
		break;
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	}

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	ath10k_warn(ar, "unsupported encryption type %d\n", type);
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	return 0;
}

560 561
#define MICHAEL_MIC_LEN 8

562 563
static int ath10k_htt_rx_crypto_tail_len(struct ath10k *ar,
					 enum htt_rx_mpdu_encrypt_type type)
564 565 566
{
	switch (type) {
	case HTT_RX_MPDU_ENCRYPT_NONE:
567
		return 0;
568 569
	case HTT_RX_MPDU_ENCRYPT_WEP40:
	case HTT_RX_MPDU_ENCRYPT_WEP104:
570
		return IEEE80211_WEP_ICV_LEN;
571 572
	case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC:
	case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:
573
		return IEEE80211_TKIP_ICV_LEN;
574
	case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:
575 576 577 578
		return IEEE80211_CCMP_MIC_LEN;
	case HTT_RX_MPDU_ENCRYPT_WEP128:
	case HTT_RX_MPDU_ENCRYPT_WAPI:
		break;
579 580
	}

581
	ath10k_warn(ar, "unsupported encryption type %d\n", type);
582 583 584
	return 0;
}

585 586 587 588 589 590
struct amsdu_subframe_hdr {
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	__be16 len;
} __packed;

591 592
#define GROUP_ID_IS_SU_MIMO(x) ((x) == 0 || (x) == 63)

593
static void ath10k_htt_rx_h_rates(struct ath10k *ar,
594 595
				  struct ieee80211_rx_status *status,
				  struct htt_rx_desc *rxd)
596
{
597 598
	struct ieee80211_supported_band *sband;
	u8 cck, rate, bw, sgi, mcs, nss;
599
	u8 preamble = 0;
600
	u8 group_id;
601
	u32 info1, info2, info3;
602

603 604 605 606 607
	info1 = __le32_to_cpu(rxd->ppdu_start.info1);
	info2 = __le32_to_cpu(rxd->ppdu_start.info2);
	info3 = __le32_to_cpu(rxd->ppdu_start.info3);

	preamble = MS(info1, RX_PPDU_START_INFO1_PREAMBLE_TYPE);
608 609 610

	switch (preamble) {
	case HTT_RX_LEGACY:
611 612 613 614 615 616
		/* To get legacy rate index band is required. Since band can't
		 * be undefined check if freq is non-zero.
		 */
		if (!status->freq)
			return;

617 618
		cck = info1 & RX_PPDU_START_INFO1_L_SIG_RATE_SELECT;
		rate = MS(info1, RX_PPDU_START_INFO1_L_SIG_RATE);
619
		rate &= ~RX_PPDU_START_RATE_FLAG;
620

621
		sband = &ar->mac.sbands[status->band];
622
		status->rate_idx = ath10k_mac_hw_rate_to_idx(sband, rate, cck);
623 624 625
		break;
	case HTT_RX_HT:
	case HTT_RX_HT_WITH_TXBF:
626 627
		/* HT-SIG - Table 20-11 in info2 and info3 */
		mcs = info2 & 0x1F;
628
		nss = mcs >> 3;
629 630
		bw = (info2 >> 7) & 1;
		sgi = (info3 >> 7) & 1;
631 632 633 634 635 636 637 638 639 640

		status->rate_idx = mcs;
		status->flag |= RX_FLAG_HT;
		if (sgi)
			status->flag |= RX_FLAG_SHORT_GI;
		if (bw)
			status->flag |= RX_FLAG_40MHZ;
		break;
	case HTT_RX_VHT:
	case HTT_RX_VHT_WITH_TXBF:
641
		/* VHT-SIG-A1 in info2, VHT-SIG-A2 in info3
642
		   TODO check this */
643 644
		bw = info2 & 3;
		sgi = info3 & 1;
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
		group_id = (info2 >> 4) & 0x3F;

		if (GROUP_ID_IS_SU_MIMO(group_id)) {
			mcs = (info3 >> 4) & 0x0F;
			nss = ((info2 >> 10) & 0x07) + 1;
		} else {
			/* Hardware doesn't decode VHT-SIG-B into Rx descriptor
			 * so it's impossible to decode MCS. Also since
			 * firmware consumes Group Id Management frames host
			 * has no knowledge regarding group/user position
			 * mapping so it's impossible to pick the correct Nsts
			 * from VHT-SIG-A1.
			 *
			 * Bandwidth and SGI are valid so report the rateinfo
			 * on best-effort basis.
			 */
			mcs = 0;
			nss = 1;
		}
664

665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
		if (mcs > 0x09) {
			ath10k_warn(ar, "invalid MCS received %u\n", mcs);
			ath10k_warn(ar, "rxd %08x mpdu start %08x %08x msdu start %08x %08x ppdu start %08x %08x %08x %08x %08x\n",
				    __le32_to_cpu(rxd->attention.flags),
				    __le32_to_cpu(rxd->mpdu_start.info0),
				    __le32_to_cpu(rxd->mpdu_start.info1),
				    __le32_to_cpu(rxd->msdu_start.common.info0),
				    __le32_to_cpu(rxd->msdu_start.common.info1),
				    rxd->ppdu_start.info0,
				    __le32_to_cpu(rxd->ppdu_start.info1),
				    __le32_to_cpu(rxd->ppdu_start.info2),
				    __le32_to_cpu(rxd->ppdu_start.info3),
				    __le32_to_cpu(rxd->ppdu_start.info4));

			ath10k_warn(ar, "msdu end %08x mpdu end %08x\n",
				    __le32_to_cpu(rxd->msdu_end.common.info0),
				    __le32_to_cpu(rxd->mpdu_end.info0));

			ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL,
					"rx desc msdu payload: ",
					rxd->msdu_payload, 50);
		}

688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
		status->rate_idx = mcs;
		status->vht_nss = nss;

		if (sgi)
			status->flag |= RX_FLAG_SHORT_GI;

		switch (bw) {
		/* 20MHZ */
		case 0:
			break;
		/* 40MHZ */
		case 1:
			status->flag |= RX_FLAG_40MHZ;
			break;
		/* 80MHZ */
		case 2:
			status->vht_flag |= RX_VHT_FLAG_80MHZ;
		}

		status->flag |= RX_FLAG_VHT;
		break;
	default:
		break;
	}
}

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static struct ieee80211_channel *
ath10k_htt_rx_h_peer_channel(struct ath10k *ar, struct htt_rx_desc *rxd)
{
	struct ath10k_peer *peer;
	struct ath10k_vif *arvif;
	struct cfg80211_chan_def def;
	u16 peer_id;

	lockdep_assert_held(&ar->data_lock);

	if (!rxd)
		return NULL;

	if (rxd->attention.flags &
	    __cpu_to_le32(RX_ATTENTION_FLAGS_PEER_IDX_INVALID))
		return NULL;

731
	if (!(rxd->msdu_end.common.info0 &
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	      __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU)))
		return NULL;

	peer_id = MS(__le32_to_cpu(rxd->mpdu_start.info0),
		     RX_MPDU_START_INFO0_PEER_IDX);

	peer = ath10k_peer_find_by_id(ar, peer_id);
	if (!peer)
		return NULL;

	arvif = ath10k_get_arvif(ar, peer->vdev_id);
	if (WARN_ON_ONCE(!arvif))
		return NULL;

746
	if (ath10k_mac_vif_chan(arvif->vif, &def))
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		return NULL;

	return def.chan;
}

static struct ieee80211_channel *
ath10k_htt_rx_h_vdev_channel(struct ath10k *ar, u32 vdev_id)
{
	struct ath10k_vif *arvif;
	struct cfg80211_chan_def def;

	lockdep_assert_held(&ar->data_lock);

	list_for_each_entry(arvif, &ar->arvifs, list) {
		if (arvif->vdev_id == vdev_id &&
		    ath10k_mac_vif_chan(arvif->vif, &def) == 0)
			return def.chan;
	}

	return NULL;
}

static void
ath10k_htt_rx_h_any_chan_iter(struct ieee80211_hw *hw,
			      struct ieee80211_chanctx_conf *conf,
			      void *data)
{
	struct cfg80211_chan_def *def = data;

	*def = conf->def;
}

static struct ieee80211_channel *
ath10k_htt_rx_h_any_channel(struct ath10k *ar)
{
	struct cfg80211_chan_def def = {};

	ieee80211_iter_chan_contexts_atomic(ar->hw,
					    ath10k_htt_rx_h_any_chan_iter,
					    &def);

	return def.chan;
}

791
static bool ath10k_htt_rx_h_channel(struct ath10k *ar,
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				    struct ieee80211_rx_status *status,
				    struct htt_rx_desc *rxd,
				    u32 vdev_id)
795 796 797 798 799 800 801
{
	struct ieee80211_channel *ch;

	spin_lock_bh(&ar->data_lock);
	ch = ar->scan_channel;
	if (!ch)
		ch = ar->rx_channel;
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	if (!ch)
		ch = ath10k_htt_rx_h_peer_channel(ar, rxd);
	if (!ch)
		ch = ath10k_htt_rx_h_vdev_channel(ar, vdev_id);
	if (!ch)
		ch = ath10k_htt_rx_h_any_channel(ar);
808 809
	if (!ch)
		ch = ar->tgt_oper_chan;
810 811 812 813 814 815 816 817 818 819 820
	spin_unlock_bh(&ar->data_lock);

	if (!ch)
		return false;

	status->band = ch->band;
	status->freq = ch->center_freq;

	return true;
}

821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
static void ath10k_htt_rx_h_signal(struct ath10k *ar,
				   struct ieee80211_rx_status *status,
				   struct htt_rx_desc *rxd)
{
	/* FIXME: Get real NF */
	status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
			 rxd->ppdu_start.rssi_comb;
	status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
}

static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
				    struct ieee80211_rx_status *status,
				    struct htt_rx_desc *rxd)
{
	/* FIXME: TSF is known only at the end of PPDU, in the last MPDU. This
	 * means all prior MSDUs in a PPDU are reported to mac80211 without the
	 * TSF. Is it worth holding frames until end of PPDU is known?
	 *
	 * FIXME: Can we get/compute 64bit TSF?
	 */
841
	status->mactime = __le32_to_cpu(rxd->ppdu_end.common.tsf_timestamp);
842 843 844 845 846
	status->flag |= RX_FLAG_MACTIME_END;
}

static void ath10k_htt_rx_h_ppdu(struct ath10k *ar,
				 struct sk_buff_head *amsdu,
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				 struct ieee80211_rx_status *status,
				 u32 vdev_id)
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879
{
	struct sk_buff *first;
	struct htt_rx_desc *rxd;
	bool is_first_ppdu;
	bool is_last_ppdu;

	if (skb_queue_empty(amsdu))
		return;

	first = skb_peek(amsdu);
	rxd = (void *)first->data - sizeof(*rxd);

	is_first_ppdu = !!(rxd->attention.flags &
			   __cpu_to_le32(RX_ATTENTION_FLAGS_FIRST_MPDU));
	is_last_ppdu = !!(rxd->attention.flags &
			  __cpu_to_le32(RX_ATTENTION_FLAGS_LAST_MPDU));

	if (is_first_ppdu) {
		/* New PPDU starts so clear out the old per-PPDU status. */
		status->freq = 0;
		status->rate_idx = 0;
		status->vht_nss = 0;
		status->vht_flag &= ~RX_VHT_FLAG_80MHZ;
		status->flag &= ~(RX_FLAG_HT |
				  RX_FLAG_VHT |
				  RX_FLAG_SHORT_GI |
				  RX_FLAG_40MHZ |
				  RX_FLAG_MACTIME_END);
		status->flag |= RX_FLAG_NO_SIGNAL_VAL;

		ath10k_htt_rx_h_signal(ar, status, rxd);
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		ath10k_htt_rx_h_channel(ar, status, rxd, vdev_id);
881 882 883 884 885 886 887
		ath10k_htt_rx_h_rates(ar, status, rxd);
	}

	if (is_last_ppdu)
		ath10k_htt_rx_h_mactime(ar, status, rxd);
}

888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
static const char * const tid_to_ac[] = {
	"BE",
	"BK",
	"BK",
	"BE",
	"VI",
	"VI",
	"VO",
	"VO",
};

static char *ath10k_get_tid(struct ieee80211_hdr *hdr, char *out, size_t size)
{
	u8 *qc;
	int tid;

	if (!ieee80211_is_data_qos(hdr->frame_control))
		return "";

	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	if (tid < 8)
		snprintf(out, size, "tid %d (%s)", tid, tid_to_ac[tid]);
	else
		snprintf(out, size, "tid %d", tid);

	return out;
}

917 918 919
static void ath10k_process_rx(struct ath10k *ar,
			      struct ieee80211_rx_status *rx_status,
			      struct sk_buff *skb)
920 921
{
	struct ieee80211_rx_status *status;
922 923
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	char tid[32];
924

925 926
	status = IEEE80211_SKB_RXCB(skb);
	*status = *rx_status;
927

928
	ath10k_dbg(ar, ATH10K_DBG_DATA,
929
		   "rx skb %pK len %u peer %pM %s %s sn %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u flag 0x%llx fcs-err %i mic-err %i amsdu-more %i\n",
930 931
		   skb,
		   skb->len,
932 933 934 935 936
		   ieee80211_get_SA(hdr),
		   ath10k_get_tid(hdr, tid, sizeof(tid)),
		   is_multicast_ether_addr(ieee80211_get_DA(hdr)) ?
							"mcast" : "ucast",
		   (__le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4,
937 938
		   (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) == 0 ?
							"legacy" : "",
939 940 941 942 943 944 945 946
		   status->flag & RX_FLAG_HT ? "ht" : "",
		   status->flag & RX_FLAG_VHT ? "vht" : "",
		   status->flag & RX_FLAG_40MHZ ? "40" : "",
		   status->vht_flag & RX_VHT_FLAG_80MHZ ? "80" : "",
		   status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
		   status->rate_idx,
		   status->vht_nss,
		   status->freq,
947
		   status->band, status->flag,
948
		   !!(status->flag & RX_FLAG_FAILED_FCS_CRC),
949 950
		   !!(status->flag & RX_FLAG_MMIC_ERROR),
		   !!(status->flag & RX_FLAG_AMSDU_MORE));
951
	ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
952
			skb->data, skb->len);
953 954
	trace_ath10k_rx_hdr(ar, skb->data, skb->len);
	trace_ath10k_rx_payload(ar, skb->data, skb->len);
955

956
	ieee80211_rx_napi(ar->hw, NULL, skb, &ar->napi);
957 958
}

959 960
static int ath10k_htt_rx_nwifi_hdrlen(struct ath10k *ar,
				      struct ieee80211_hdr *hdr)
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Michal Kazior 已提交
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{
962 963 964
	int len = ieee80211_hdrlen(hdr->frame_control);

	if (!test_bit(ATH10K_FW_FEATURE_NO_NWIFI_DECAP_4ADDR_PADDING,
965
		      ar->running_fw->fw_file.fw_features))
966 967 968
		len = round_up(len, 4);

	return len;
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}

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static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
					struct sk_buff *msdu,
					struct ieee80211_rx_status *status,
					enum htt_rx_mpdu_encrypt_type enctype,
					bool is_decrypted)
976
{
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	struct ieee80211_hdr *hdr;
978
	struct htt_rx_desc *rxd;
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	size_t hdr_len;
	size_t crypto_len;
	bool is_first;
	bool is_last;

	rxd = (void *)msdu->data - sizeof(*rxd);
985
	is_first = !!(rxd->msdu_end.common.info0 &
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		      __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
987
	is_last = !!(rxd->msdu_end.common.info0 &
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		     __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));

	/* Delivered decapped frame:
	 * [802.11 header]
	 * [crypto param] <-- can be trimmed if !fcs_err &&
	 *                    !decrypt_err && !peer_idx_invalid
	 * [amsdu header] <-- only if A-MSDU
	 * [rfc1042/llc]
	 * [payload]
	 * [FCS] <-- at end, needs to be trimmed
	 */

	/* This probably shouldn't happen but warn just in case */
	if (unlikely(WARN_ON_ONCE(!is_first)))
		return;

	/* This probably shouldn't happen but warn just in case */
	if (unlikely(WARN_ON_ONCE(!(is_first && is_last))))
		return;

	skb_trim(msdu, msdu->len - FCS_LEN);

	/* In most cases this will be true for sniffed frames. It makes sense
1011 1012
	 * to deliver them as-is without stripping the crypto param. This is
	 * necessary for software based decryption.
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	 *
	 * If there's no error then the frame is decrypted. At least that is
	 * the case for frames that come in via fragmented rx indication.
	 */
	if (!is_decrypted)
		return;

	/* The payload is decrypted so strip crypto params. Start from tail
	 * since hdr is used to compute some stuff.
	 */

	hdr = (void *)msdu->data;

	/* Tail */
1027 1028 1029
	if (status->flag & RX_FLAG_IV_STRIPPED)
		skb_trim(msdu, msdu->len -
			 ath10k_htt_rx_crypto_tail_len(ar, enctype));
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	/* MMIC */
1032 1033
	if ((status->flag & RX_FLAG_MMIC_STRIPPED) &&
	    !ieee80211_has_morefrags(hdr->frame_control) &&
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	    enctype == HTT_RX_MPDU_ENCRYPT_TKIP_WPA)
		skb_trim(msdu, msdu->len - 8);

	/* Head */
1038 1039 1040
	if (status->flag & RX_FLAG_IV_STRIPPED) {
		hdr_len = ieee80211_hdrlen(hdr->frame_control);
		crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
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1042 1043 1044 1045
		memmove((void *)msdu->data + crypto_len,
			(void *)msdu->data, hdr_len);
		skb_pull(msdu, crypto_len);
	}
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}

static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
					  struct sk_buff *msdu,
					  struct ieee80211_rx_status *status,
					  const u8 first_hdr[64])
{
1053
	struct ieee80211_hdr *hdr;
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	size_t hdr_len;
	u8 da[ETH_ALEN];
	u8 sa[ETH_ALEN];
1057

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	/* Delivered decapped frame:
	 * [nwifi 802.11 header] <-- replaced with 802.11 hdr
	 * [rfc1042/llc]
	 *
	 * Note: The nwifi header doesn't have QoS Control and is
	 * (always?) a 3addr frame.
	 *
	 * Note2: There's no A-MSDU subframe header. Even if it's part
	 * of an A-MSDU.
	 */
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	/* pull decapped header and copy SA & DA */
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
	if ((ar->hw_params.hw_4addr_pad == ATH10K_HW_4ADDR_PAD_BEFORE) &&
	    ieee80211_has_a4(((struct ieee80211_hdr *)first_hdr)->frame_control)) {
		/* The QCA99X0 4 address mode pad 2 bytes at the
		 * beginning of MSDU
		 */
		hdr = (struct ieee80211_hdr *)(msdu->data + 2);
		/* The skb length need be extended 2 as the 2 bytes at the tail
		 * be excluded due to the padding
		 */
		skb_put(msdu, 2);
	} else {
		hdr = (struct ieee80211_hdr *)(msdu->data);
	}

1084
	hdr_len = ath10k_htt_rx_nwifi_hdrlen(ar, hdr);
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	ether_addr_copy(da, ieee80211_get_DA(hdr));
	ether_addr_copy(sa, ieee80211_get_SA(hdr));
	skb_pull(msdu, hdr_len);
1088

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	/* push original 802.11 header */
	hdr = (struct ieee80211_hdr *)first_hdr;
1091
	hdr_len = ieee80211_hdrlen(hdr->frame_control);
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	memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
1093

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	/* original 802.11 header has a different DA and in
	 * case of 4addr it may also have different SA
	 */
	hdr = (struct ieee80211_hdr *)msdu->data;
	ether_addr_copy(ieee80211_get_DA(hdr), da);
	ether_addr_copy(ieee80211_get_SA(hdr), sa);
}
1101

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1102 1103 1104 1105 1106 1107 1108 1109 1110
static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar,
					  struct sk_buff *msdu,
					  enum htt_rx_mpdu_encrypt_type enctype)
{
	struct ieee80211_hdr *hdr;
	struct htt_rx_desc *rxd;
	size_t hdr_len, crypto_len;
	void *rfc1042;
	bool is_first, is_last, is_amsdu;
1111

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1112 1113
	rxd = (void *)msdu->data - sizeof(*rxd);
	hdr = (void *)rxd->rx_hdr_status;
1114

1115
	is_first = !!(rxd->msdu_end.common.info0 &
M
Michal Kazior 已提交
1116
		      __cpu_to_le32(RX_MSDU_END_INFO0_FIRST_MSDU));
1117
	is_last = !!(rxd->msdu_end.common.info0 &
M
Michal Kazior 已提交
1118 1119
		     __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU));
	is_amsdu = !(is_first && is_last);
1120

M
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1121
	rfc1042 = hdr;
1122

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1123 1124 1125
	if (is_first) {
		hdr_len = ieee80211_hdrlen(hdr->frame_control);
		crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
1126

M
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1127 1128
		rfc1042 += round_up(hdr_len, 4) +
			   round_up(crypto_len, 4);
1129
	}
1130

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1131 1132 1133 1134
	if (is_amsdu)
		rfc1042 += sizeof(struct amsdu_subframe_hdr);

	return rfc1042;
1135 1136
}

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1137 1138 1139 1140 1141
static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
					struct sk_buff *msdu,
					struct ieee80211_rx_status *status,
					const u8 first_hdr[64],
					enum htt_rx_mpdu_encrypt_type enctype)
1142 1143
{
	struct ieee80211_hdr *hdr;
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1144 1145
	struct ethhdr *eth;
	size_t hdr_len;
1146
	void *rfc1042;
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1147 1148
	u8 da[ETH_ALEN];
	u8 sa[ETH_ALEN];
1149

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1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	/* Delivered decapped frame:
	 * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
	 * [payload]
	 */

	rfc1042 = ath10k_htt_rx_h_find_rfc1042(ar, msdu, enctype);
	if (WARN_ON_ONCE(!rfc1042))
		return;

	/* pull decapped header and copy SA & DA */
	eth = (struct ethhdr *)msdu->data;
	ether_addr_copy(da, eth->h_dest);
	ether_addr_copy(sa, eth->h_source);
	skb_pull(msdu, sizeof(struct ethhdr));

	/* push rfc1042/llc/snap */
	memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042,
	       sizeof(struct rfc1042_hdr));

	/* push original 802.11 header */
	hdr = (struct ieee80211_hdr *)first_hdr;
	hdr_len = ieee80211_hdrlen(hdr->frame_control);
	memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);

	/* original 802.11 header has a different DA and in
	 * case of 4addr it may also have different SA
	 */
	hdr = (struct ieee80211_hdr *)msdu->data;
	ether_addr_copy(ieee80211_get_DA(hdr), da);
	ether_addr_copy(ieee80211_get_SA(hdr), sa);
}

static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
					 struct sk_buff *msdu,
					 struct ieee80211_rx_status *status,
					 const u8 first_hdr[64])
{
	struct ieee80211_hdr *hdr;
	size_t hdr_len;

	/* Delivered decapped frame:
	 * [amsdu header] <-- replaced with 802.11 hdr
	 * [rfc1042/llc]
	 * [payload]
	 */

	skb_pull(msdu, sizeof(struct amsdu_subframe_hdr));

	hdr = (struct ieee80211_hdr *)first_hdr;
1199
	hdr_len = ieee80211_hdrlen(hdr->frame_control);
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	memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
}
1202

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static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
				    struct sk_buff *msdu,
				    struct ieee80211_rx_status *status,
				    u8 first_hdr[64],
				    enum htt_rx_mpdu_encrypt_type enctype,
				    bool is_decrypted)
{
	struct htt_rx_desc *rxd;
	enum rx_msdu_decap_format decap;
1212

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	/* First msdu's decapped header:
	 * [802.11 header] <-- padded to 4 bytes long
	 * [crypto param] <-- padded to 4 bytes long
	 * [amsdu header] <-- only if A-MSDU
	 * [rfc1042/llc]
	 *
	 * Other (2nd, 3rd, ..) msdu's decapped header:
	 * [amsdu header] <-- only if A-MSDU
	 * [rfc1042/llc]
	 */

	rxd = (void *)msdu->data - sizeof(*rxd);
1225
	decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
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Michal Kazior 已提交
1226 1227 1228
		   RX_MSDU_START_INFO1_DECAP_FORMAT);

	switch (decap) {
1229
	case RX_MSDU_DECAP_RAW:
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Michal Kazior 已提交
1230 1231
		ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype,
					    is_decrypted);
1232 1233
		break;
	case RX_MSDU_DECAP_NATIVE_WIFI:
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		ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
1235 1236
		break;
	case RX_MSDU_DECAP_ETHERNET2_DIX:
M
Michal Kazior 已提交
1237
		ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
1238 1239
		break;
	case RX_MSDU_DECAP_8023_SNAP_LLC:
M
Michal Kazior 已提交
1240
		ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
1241
		break;
1242 1243 1244
	}
}

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
static int ath10k_htt_rx_get_csum_state(struct sk_buff *skb)
{
	struct htt_rx_desc *rxd;
	u32 flags, info;
	bool is_ip4, is_ip6;
	bool is_tcp, is_udp;
	bool ip_csum_ok, tcpudp_csum_ok;

	rxd = (void *)skb->data - sizeof(*rxd);
	flags = __le32_to_cpu(rxd->attention.flags);
1255
	info = __le32_to_cpu(rxd->msdu_start.common.info1);
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275

	is_ip4 = !!(info & RX_MSDU_START_INFO1_IPV4_PROTO);
	is_ip6 = !!(info & RX_MSDU_START_INFO1_IPV6_PROTO);
	is_tcp = !!(info & RX_MSDU_START_INFO1_TCP_PROTO);
	is_udp = !!(info & RX_MSDU_START_INFO1_UDP_PROTO);
	ip_csum_ok = !(flags & RX_ATTENTION_FLAGS_IP_CHKSUM_FAIL);
	tcpudp_csum_ok = !(flags & RX_ATTENTION_FLAGS_TCP_UDP_CHKSUM_FAIL);

	if (!is_ip4 && !is_ip6)
		return CHECKSUM_NONE;
	if (!is_tcp && !is_udp)
		return CHECKSUM_NONE;
	if (!ip_csum_ok)
		return CHECKSUM_NONE;
	if (!tcpudp_csum_ok)
		return CHECKSUM_NONE;

	return CHECKSUM_UNNECESSARY;
}

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1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
{
	msdu->ip_summed = ath10k_htt_rx_get_csum_state(msdu);
}

static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
				 struct sk_buff_head *amsdu,
				 struct ieee80211_rx_status *status)
{
	struct sk_buff *first;
	struct sk_buff *last;
	struct sk_buff *msdu;
	struct htt_rx_desc *rxd;
	struct ieee80211_hdr *hdr;
	enum htt_rx_mpdu_encrypt_type enctype;
	u8 first_hdr[64];
	u8 *qos;
	size_t hdr_len;
	bool has_fcs_err;
	bool has_crypto_err;
	bool has_tkip_err;
	bool has_peer_idx_invalid;
	bool is_decrypted;
1299
	bool is_mgmt;
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	u32 attention;

	if (skb_queue_empty(amsdu))
		return;

	first = skb_peek(amsdu);
	rxd = (void *)first->data - sizeof(*rxd);

1308 1309 1310
	is_mgmt = !!(rxd->attention.flags &
		     __cpu_to_le32(RX_ATTENTION_FLAGS_MGMT_TYPE));

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1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
	enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
		     RX_MPDU_START_INFO0_ENCRYPT_TYPE);

	/* First MSDU's Rx descriptor in an A-MSDU contains full 802.11
	 * decapped header. It'll be used for undecapping of each MSDU.
	 */
	hdr = (void *)rxd->rx_hdr_status;
	hdr_len = ieee80211_hdrlen(hdr->frame_control);
	memcpy(first_hdr, hdr, hdr_len);

	/* Each A-MSDU subframe will use the original header as the base and be
	 * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
	 */
	hdr = (void *)first_hdr;
	qos = ieee80211_get_qos_ctl(hdr);
	qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;

	/* Some attention flags are valid only in the last MSDU. */
	last = skb_peek_tail(amsdu);
	rxd = (void *)last->data - sizeof(*rxd);
	attention = __le32_to_cpu(rxd->attention.flags);

	has_fcs_err = !!(attention & RX_ATTENTION_FLAGS_FCS_ERR);
	has_crypto_err = !!(attention & RX_ATTENTION_FLAGS_DECRYPT_ERR);
	has_tkip_err = !!(attention & RX_ATTENTION_FLAGS_TKIP_MIC_ERR);
	has_peer_idx_invalid = !!(attention & RX_ATTENTION_FLAGS_PEER_IDX_INVALID);

	/* Note: If hardware captures an encrypted frame that it can't decrypt,
	 * e.g. due to fcs error, missing peer or invalid key data it will
	 * report the frame as raw.
	 */
	is_decrypted = (enctype != HTT_RX_MPDU_ENCRYPT_NONE &&
			!has_fcs_err &&
			!has_crypto_err &&
			!has_peer_idx_invalid);

	/* Clear per-MPDU flags while leaving per-PPDU flags intact. */
	status->flag &= ~(RX_FLAG_FAILED_FCS_CRC |
			  RX_FLAG_MMIC_ERROR |
			  RX_FLAG_DECRYPTED |
			  RX_FLAG_IV_STRIPPED |
1352
			  RX_FLAG_ONLY_MONITOR |
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1353 1354 1355 1356 1357 1358 1359 1360
			  RX_FLAG_MMIC_STRIPPED);

	if (has_fcs_err)
		status->flag |= RX_FLAG_FAILED_FCS_CRC;

	if (has_tkip_err)
		status->flag |= RX_FLAG_MMIC_ERROR;

1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	/* Firmware reports all necessary management frames via WMI already.
	 * They are not reported to monitor interfaces at all so pass the ones
	 * coming via HTT to monitor interfaces instead. This simplifies
	 * matters a lot.
	 */
	if (is_mgmt)
		status->flag |= RX_FLAG_ONLY_MONITOR;

	if (is_decrypted) {
		status->flag |= RX_FLAG_DECRYPTED;

		if (likely(!is_mgmt))
			status->flag |= RX_FLAG_IV_STRIPPED |
					RX_FLAG_MMIC_STRIPPED;
}
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	skb_queue_walk(amsdu, msdu) {
		ath10k_htt_rx_h_csum_offload(msdu);
		ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype,
					is_decrypted);

		/* Undecapping involves copying the original 802.11 header back
		 * to sk_buff. If frame is protected and hardware has decrypted
		 * it then remove the protected bit.
		 */
		if (!is_decrypted)
			continue;
1388 1389
		if (is_mgmt)
			continue;
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		hdr = (void *)msdu->data;
		hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	}
}

static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
				    struct sk_buff_head *amsdu,
				    struct ieee80211_rx_status *status)
{
	struct sk_buff *msdu;

	while ((msdu = __skb_dequeue(amsdu))) {
		/* Setup per-MSDU flags */
		if (skb_queue_empty(amsdu))
			status->flag &= ~RX_FLAG_AMSDU_MORE;
		else
			status->flag |= RX_FLAG_AMSDU_MORE;

		ath10k_process_rx(ar, status, msdu);
	}
}

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Michal Kazior 已提交
1413
static int ath10k_unchain_msdu(struct sk_buff_head *amsdu)
B
Ben Greear 已提交
1414
{
M
Michal Kazior 已提交
1415
	struct sk_buff *skb, *first;
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1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
	int space;
	int total_len = 0;

	/* TODO:  Might could optimize this by using
	 * skb_try_coalesce or similar method to
	 * decrease copying, or maybe get mac80211 to
	 * provide a way to just receive a list of
	 * skb?
	 */

M
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1426
	first = __skb_dequeue(amsdu);
B
Ben Greear 已提交
1427 1428

	/* Allocate total length all at once. */
M
Michal Kazior 已提交
1429 1430
	skb_queue_walk(amsdu, skb)
		total_len += skb->len;
B
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1431

M
Michal Kazior 已提交
1432
	space = total_len - skb_tailroom(first);
B
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1433
	if ((space > 0) &&
M
Michal Kazior 已提交
1434
	    (pskb_expand_head(first, 0, space, GFP_ATOMIC) < 0)) {
B
Ben Greear 已提交
1435 1436 1437 1438
		/* TODO:  bump some rx-oom error stat */
		/* put it back together so we can free the
		 * whole list at once.
		 */
M
Michal Kazior 已提交
1439
		__skb_queue_head(amsdu, first);
B
Ben Greear 已提交
1440 1441 1442 1443 1444 1445
		return -1;
	}

	/* Walk list again, copying contents into
	 * msdu_head
	 */
M
Michal Kazior 已提交
1446 1447 1448 1449
	while ((skb = __skb_dequeue(amsdu))) {
		skb_copy_from_linear_data(skb, skb_put(first, skb->len),
					  skb->len);
		dev_kfree_skb_any(skb);
B
Ben Greear 已提交
1450 1451
	}

M
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1452
	__skb_queue_head(amsdu, first);
B
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1453 1454 1455
	return 0;
}

M
Michal Kazior 已提交
1456 1457 1458
static void ath10k_htt_rx_h_unchain(struct ath10k *ar,
				    struct sk_buff_head *amsdu,
				    bool chained)
1459
{
M
Michal Kazior 已提交
1460 1461 1462
	struct sk_buff *first;
	struct htt_rx_desc *rxd;
	enum rx_msdu_decap_format decap;
1463

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1464 1465
	first = skb_peek(amsdu);
	rxd = (void *)first->data - sizeof(*rxd);
1466
	decap = MS(__le32_to_cpu(rxd->msdu_start.common.info1),
M
Michal Kazior 已提交
1467
		   RX_MSDU_START_INFO1_DECAP_FORMAT);
1468

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1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
	if (!chained)
		return;

	/* FIXME: Current unchaining logic can only handle simple case of raw
	 * msdu chaining. If decapping is other than raw the chaining may be
	 * more complex and this isn't handled by the current code. Don't even
	 * try re-constructing such frames - it'll be pretty much garbage.
	 */
	if (decap != RX_MSDU_DECAP_RAW ||
	    skb_queue_len(amsdu) != 1 + rxd->frag_info.ring2_more_count) {
		__skb_queue_purge(amsdu);
		return;
1481 1482
	}

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1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	ath10k_unchain_msdu(amsdu);
}

static bool ath10k_htt_rx_amsdu_allowed(struct ath10k *ar,
					struct sk_buff_head *amsdu,
					struct ieee80211_rx_status *rx_status)
{
	/* FIXME: It might be a good idea to do some fuzzy-testing to drop
	 * invalid/dangerous frames.
	 */

	if (!rx_status->freq) {
		ath10k_warn(ar, "no channel configured; ignoring frame(s)!\n");
1496 1497 1498
		return false;
	}

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1499 1500
	if (test_bit(ATH10K_CAC_RUNNING, &ar->dev_flags)) {
		ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx cac running\n");
1501 1502 1503 1504 1505 1506
		return false;
	}

	return true;
}

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1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
static void ath10k_htt_rx_h_filter(struct ath10k *ar,
				   struct sk_buff_head *amsdu,
				   struct ieee80211_rx_status *rx_status)
{
	if (skb_queue_empty(amsdu))
		return;

	if (ath10k_htt_rx_amsdu_allowed(ar, amsdu, rx_status))
		return;

	__skb_queue_purge(amsdu);
}

1520
static int ath10k_htt_rx_handle_amsdu(struct ath10k_htt *htt)
1521
{
1522
	struct ath10k *ar = htt->ar;
1523
	struct ieee80211_rx_status *rx_status = &htt->rx_status;
M
Michal Kazior 已提交
1524
	struct sk_buff_head amsdu;
1525
	int ret, num_msdus;
1526

1527
	__skb_queue_head_init(&amsdu);
1528

1529 1530 1531 1532 1533 1534 1535
	spin_lock_bh(&htt->rx_ring.lock);
	if (htt->rx_confused) {
		spin_unlock_bh(&htt->rx_ring.lock);
		return -EIO;
	}
	ret = ath10k_htt_rx_amsdu_pop(htt, &amsdu);
	spin_unlock_bh(&htt->rx_ring.lock);
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Michal Kazior 已提交
1536

1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
	if (ret < 0) {
		ath10k_warn(ar, "rx ring became corrupted: %d\n", ret);
		__skb_queue_purge(&amsdu);
		/* FIXME: It's probably a good idea to reboot the
		 * device instead of leaving it inoperable.
		 */
		htt->rx_confused = true;
		return ret;
	}

1547
	num_msdus = skb_queue_len(&amsdu);
1548
	ath10k_htt_rx_h_ppdu(ar, &amsdu, rx_status, 0xffff);
1549
	ath10k_htt_rx_h_unchain(ar, &amsdu, ret > 0);
1550 1551 1552
	ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
	ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
	ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
1553

1554
	return num_msdus;
1555 1556
}

1557 1558
static void ath10k_htt_rx_proc_rx_ind(struct ath10k_htt *htt,
				      struct htt_rx_indication *rx)
1559
{
1560
	struct ath10k *ar = htt->ar;
1561 1562
	struct htt_rx_indication_mpdu_range *mpdu_ranges;
	int num_mpdu_ranges;
1563
	int i, mpdu_count = 0;
1564 1565 1566 1567 1568

	num_mpdu_ranges = MS(__le32_to_cpu(rx->hdr.info1),
			     HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES);
	mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);

1569
	ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt rx ind: ",
1570 1571 1572 1573
			rx, sizeof(*rx) +
			(sizeof(struct htt_rx_indication_mpdu_range) *
				num_mpdu_ranges));

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Michal Kazior 已提交
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	for (i = 0; i < num_mpdu_ranges; i++)
		mpdu_count += mpdu_ranges[i].mpdu_count;

1577
	atomic_add(mpdu_count, &htt->num_mpdus_ready);
1578 1579
}

1580
static void ath10k_htt_rx_tx_compl_ind(struct ath10k *ar,
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
				       struct sk_buff *skb)
{
	struct ath10k_htt *htt = &ar->htt;
	struct htt_resp *resp = (struct htt_resp *)skb->data;
	struct htt_tx_done tx_done = {};
	int status = MS(resp->data_tx_completion.flags, HTT_DATA_TX_STATUS);
	__le16 msdu_id;
	int i;

	switch (status) {
	case HTT_DATA_TX_STATUS_NO_ACK:
1592
		tx_done.status = HTT_TX_COMPL_STATE_NOACK;
1593 1594
		break;
	case HTT_DATA_TX_STATUS_OK:
1595
		tx_done.status = HTT_TX_COMPL_STATE_ACK;
1596 1597 1598 1599
		break;
	case HTT_DATA_TX_STATUS_DISCARD:
	case HTT_DATA_TX_STATUS_POSTPONE:
	case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
1600
		tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
1601 1602
		break;
	default:
1603
		ath10k_warn(ar, "unhandled tx completion status %d\n", status);
1604
		tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
1605 1606 1607
		break;
	}

1608
	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
1609 1610 1611 1612 1613
		   resp->data_tx_completion.num_msdus);

	for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
		msdu_id = resp->data_tx_completion.msdus[i];
		tx_done.msdu_id = __le16_to_cpu(msdu_id);
1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627

		/* kfifo_put: In practice firmware shouldn't fire off per-CE
		 * interrupt and main interrupt (MSI/-X range case) for the same
		 * HTC service so it should be safe to use kfifo_put w/o lock.
		 *
		 * From kfifo_put() documentation:
		 *  Note that with only one concurrent reader and one concurrent
		 *  writer, you don't need extra locking to use these macro.
		 */
		if (!kfifo_put(&htt->txdone_fifo, tx_done)) {
			ath10k_warn(ar, "txdone fifo overrun, msdu_id %d status %d\n",
				    tx_done.msdu_id, tx_done.status);
			ath10k_txrx_tx_unref(htt, &tx_done);
		}
1628 1629 1630
	}
}

1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641
static void ath10k_htt_rx_addba(struct ath10k *ar, struct htt_resp *resp)
{
	struct htt_rx_addba *ev = &resp->rx_addba;
	struct ath10k_peer *peer;
	struct ath10k_vif *arvif;
	u16 info0, tid, peer_id;

	info0 = __le16_to_cpu(ev->info0);
	tid = MS(info0, HTT_RX_BA_INFO0_TID);
	peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);

1642
	ath10k_dbg(ar, ATH10K_DBG_HTT,
1643 1644 1645 1646 1647 1648
		   "htt rx addba tid %hu peer_id %hu size %hhu\n",
		   tid, peer_id, ev->window_size);

	spin_lock_bh(&ar->data_lock);
	peer = ath10k_peer_find_by_id(ar, peer_id);
	if (!peer) {
1649
		ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1650 1651 1652 1653 1654 1655 1656
			    peer_id);
		spin_unlock_bh(&ar->data_lock);
		return;
	}

	arvif = ath10k_get_arvif(ar, peer->vdev_id);
	if (!arvif) {
1657
		ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1658 1659 1660 1661 1662
			    peer->vdev_id);
		spin_unlock_bh(&ar->data_lock);
		return;
	}

1663
	ath10k_dbg(ar, ATH10K_DBG_HTT,
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
		   "htt rx start rx ba session sta %pM tid %hu size %hhu\n",
		   peer->addr, tid, ev->window_size);

	ieee80211_start_rx_ba_session_offl(arvif->vif, peer->addr, tid);
	spin_unlock_bh(&ar->data_lock);
}

static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
{
	struct htt_rx_delba *ev = &resp->rx_delba;
	struct ath10k_peer *peer;
	struct ath10k_vif *arvif;
	u16 info0, tid, peer_id;

	info0 = __le16_to_cpu(ev->info0);
	tid = MS(info0, HTT_RX_BA_INFO0_TID);
	peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);

1682
	ath10k_dbg(ar, ATH10K_DBG_HTT,
1683 1684 1685 1686 1687 1688
		   "htt rx delba tid %hu peer_id %hu\n",
		   tid, peer_id);

	spin_lock_bh(&ar->data_lock);
	peer = ath10k_peer_find_by_id(ar, peer_id);
	if (!peer) {
1689
		ath10k_warn(ar, "received addba event for invalid peer_id: %hu\n",
1690 1691 1692 1693 1694 1695 1696
			    peer_id);
		spin_unlock_bh(&ar->data_lock);
		return;
	}

	arvif = ath10k_get_arvif(ar, peer->vdev_id);
	if (!arvif) {
1697
		ath10k_warn(ar, "received addba event for invalid vdev_id: %u\n",
1698 1699 1700 1701 1702
			    peer->vdev_id);
		spin_unlock_bh(&ar->data_lock);
		return;
	}

1703
	ath10k_dbg(ar, ATH10K_DBG_HTT,
1704 1705 1706 1707 1708 1709 1710
		   "htt rx stop rx ba session sta %pM tid %hu\n",
		   peer->addr, tid);

	ieee80211_stop_rx_ba_session_offl(arvif->vif, peer->addr, tid);
	spin_unlock_bh(&ar->data_lock);
}

1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
				       struct sk_buff_head *amsdu)
{
	struct sk_buff *msdu;
	struct htt_rx_desc *rxd;

	if (skb_queue_empty(list))
		return -ENOBUFS;

	if (WARN_ON(!skb_queue_empty(amsdu)))
		return -EINVAL;

	while ((msdu = __skb_dequeue(list))) {
		__skb_queue_tail(amsdu, msdu);

		rxd = (void *)msdu->data - sizeof(*rxd);
1727
		if (rxd->msdu_end.common.info0 &
1728 1729 1730 1731 1732 1733
		    __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))
			break;
	}

	msdu = skb_peek_tail(amsdu);
	rxd = (void *)msdu->data - sizeof(*rxd);
1734
	if (!(rxd->msdu_end.common.info0 &
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	      __cpu_to_le32(RX_MSDU_END_INFO0_LAST_MSDU))) {
		skb_queue_splice_init(amsdu, list);
		return -EAGAIN;
	}

	return 0;
}

static void ath10k_htt_rx_h_rx_offload_prot(struct ieee80211_rx_status *status,
					    struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	if (!ieee80211_has_protected(hdr->frame_control))
		return;

	/* Offloaded frames are already decrypted but firmware insists they are
	 * protected in the 802.11 header. Strip the flag.  Otherwise mac80211
	 * will drop the frame.
	 */

	hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	status->flag |= RX_FLAG_DECRYPTED |
			RX_FLAG_IV_STRIPPED |
			RX_FLAG_MMIC_STRIPPED;
}

1762 1763
static int ath10k_htt_rx_h_rx_offload(struct ath10k *ar,
				      struct sk_buff_head *list)
1764 1765 1766 1767 1768 1769
{
	struct ath10k_htt *htt = &ar->htt;
	struct ieee80211_rx_status *status = &htt->rx_status;
	struct htt_rx_offload_msdu *rx;
	struct sk_buff *msdu;
	size_t offset;
1770
	int num_msdu = 0;
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807

	while ((msdu = __skb_dequeue(list))) {
		/* Offloaded frames don't have Rx descriptor. Instead they have
		 * a short meta information header.
		 */

		rx = (void *)msdu->data;

		skb_put(msdu, sizeof(*rx));
		skb_pull(msdu, sizeof(*rx));

		if (skb_tailroom(msdu) < __le16_to_cpu(rx->msdu_len)) {
			ath10k_warn(ar, "dropping frame: offloaded rx msdu is too long!\n");
			dev_kfree_skb_any(msdu);
			continue;
		}

		skb_put(msdu, __le16_to_cpu(rx->msdu_len));

		/* Offloaded rx header length isn't multiple of 2 nor 4 so the
		 * actual payload is unaligned. Align the frame.  Otherwise
		 * mac80211 complains.  This shouldn't reduce performance much
		 * because these offloaded frames are rare.
		 */
		offset = 4 - ((unsigned long)msdu->data & 3);
		skb_put(msdu, offset);
		memmove(msdu->data + offset, msdu->data, msdu->len);
		skb_pull(msdu, offset);

		/* FIXME: The frame is NWifi. Re-construct QoS Control
		 * if possible later.
		 */

		memset(status, 0, sizeof(*status));
		status->flag |= RX_FLAG_NO_SIGNAL_VAL;

		ath10k_htt_rx_h_rx_offload_prot(status, msdu);
M
Michal Kazior 已提交
1808
		ath10k_htt_rx_h_channel(ar, status, NULL, rx->vdev_id);
1809
		ath10k_process_rx(ar, status, msdu);
1810
		num_msdu++;
1811
	}
1812
	return num_msdu;
1813 1814
}

1815
static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
{
	struct ath10k_htt *htt = &ar->htt;
	struct htt_resp *resp = (void *)skb->data;
	struct ieee80211_rx_status *status = &htt->rx_status;
	struct sk_buff_head list;
	struct sk_buff_head amsdu;
	u16 peer_id;
	u16 msdu_count;
	u8 vdev_id;
	u8 tid;
	bool offload;
	bool frag;
1828
	int ret, num_msdus = 0;
1829 1830 1831 1832

	lockdep_assert_held(&htt->rx_ring.lock);

	if (htt->rx_confused)
1833
		return -EIO;
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851

	skb_pull(skb, sizeof(resp->hdr));
	skb_pull(skb, sizeof(resp->rx_in_ord_ind));

	peer_id = __le16_to_cpu(resp->rx_in_ord_ind.peer_id);
	msdu_count = __le16_to_cpu(resp->rx_in_ord_ind.msdu_count);
	vdev_id = resp->rx_in_ord_ind.vdev_id;
	tid = SM(resp->rx_in_ord_ind.info, HTT_RX_IN_ORD_IND_INFO_TID);
	offload = !!(resp->rx_in_ord_ind.info &
			HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK);
	frag = !!(resp->rx_in_ord_ind.info & HTT_RX_IN_ORD_IND_INFO_FRAG_MASK);

	ath10k_dbg(ar, ATH10K_DBG_HTT,
		   "htt rx in ord vdev %i peer %i tid %i offload %i frag %i msdu count %i\n",
		   vdev_id, peer_id, tid, offload, frag, msdu_count);

	if (skb->len < msdu_count * sizeof(*resp->rx_in_ord_ind.msdu_descs)) {
		ath10k_warn(ar, "dropping invalid in order rx indication\n");
1852
		return -EINVAL;
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
	}

	/* The event can deliver more than 1 A-MSDU. Each A-MSDU is later
	 * extracted and processed.
	 */
	__skb_queue_head_init(&list);
	ret = ath10k_htt_rx_pop_paddr_list(htt, &resp->rx_in_ord_ind, &list);
	if (ret < 0) {
		ath10k_warn(ar, "failed to pop paddr list: %d\n", ret);
		htt->rx_confused = true;
1863
		return -EIO;
1864 1865 1866 1867 1868 1869
	}

	/* Offloaded frames are very different and need to be handled
	 * separately.
	 */
	if (offload)
1870
		num_msdus = ath10k_htt_rx_h_rx_offload(ar, &list);
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882

	while (!skb_queue_empty(&list)) {
		__skb_queue_head_init(&amsdu);
		ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
		switch (ret) {
		case 0:
			/* Note: The in-order indication may report interleaved
			 * frames from different PPDUs meaning reported rx rate
			 * to mac80211 isn't accurate/reliable. It's still
			 * better to report something than nothing though. This
			 * should still give an idea about rx rate to the user.
			 */
1883
			num_msdus += skb_queue_len(&amsdu);
M
Michal Kazior 已提交
1884
			ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
			ath10k_htt_rx_h_filter(ar, &amsdu, status);
			ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
			ath10k_htt_rx_h_deliver(ar, &amsdu, status);
			break;
		case -EAGAIN:
			/* fall through */
		default:
			/* Should not happen. */
			ath10k_warn(ar, "failed to extract amsdu: %d\n", ret);
			htt->rx_confused = true;
			__skb_queue_purge(&list);
1896
			return -EIO;
1897 1898
		}
	}
1899
	return num_msdus;
1900 1901
}

1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
static void ath10k_htt_rx_tx_fetch_resp_id_confirm(struct ath10k *ar,
						   const __le32 *resp_ids,
						   int num_resp_ids)
{
	int i;
	u32 resp_id;

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm num_resp_ids %d\n",
		   num_resp_ids);

	for (i = 0; i < num_resp_ids; i++) {
		resp_id = le32_to_cpu(resp_ids[i]);

		ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm resp_id %u\n",
			   resp_id);

		/* TODO: free resp_id */
	}
}

static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
{
M
Michal Kazior 已提交
1924 1925
	struct ieee80211_hw *hw = ar->hw;
	struct ieee80211_txq *txq;
1926 1927 1928 1929 1930
	struct htt_resp *resp = (struct htt_resp *)skb->data;
	struct htt_tx_fetch_record *record;
	size_t len;
	size_t max_num_bytes;
	size_t max_num_msdus;
M
Michal Kazior 已提交
1931 1932
	size_t num_bytes;
	size_t num_msdus;
1933 1934 1935 1936 1937
	const __le32 *resp_ids;
	u16 num_records;
	u16 num_resp_ids;
	u16 peer_id;
	u8 tid;
M
Michal Kazior 已提交
1938
	int ret;
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963
	int i;

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind\n");

	len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_ind);
	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_fetch_ind event: buffer too short\n");
		return;
	}

	num_records = le16_to_cpu(resp->tx_fetch_ind.num_records);
	num_resp_ids = le16_to_cpu(resp->tx_fetch_ind.num_resp_ids);

	len += sizeof(resp->tx_fetch_ind.records[0]) * num_records;
	len += sizeof(resp->tx_fetch_ind.resp_ids[0]) * num_resp_ids;

	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_fetch_ind event: too many records/resp_ids\n");
		return;
	}

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind num records %hu num resps %hu seq %hu\n",
		   num_records, num_resp_ids,
		   le16_to_cpu(resp->tx_fetch_ind.fetch_seq_num));

M
Michal Kazior 已提交
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
	if (!ar->htt.tx_q_state.enabled) {
		ath10k_warn(ar, "received unexpected tx_fetch_ind event: not enabled\n");
		return;
	}

	if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH) {
		ath10k_warn(ar, "received unexpected tx_fetch_ind event: in push mode\n");
		return;
	}

	rcu_read_lock();
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994

	for (i = 0; i < num_records; i++) {
		record = &resp->tx_fetch_ind.records[i];
		peer_id = MS(le16_to_cpu(record->info),
			     HTT_TX_FETCH_RECORD_INFO_PEER_ID);
		tid = MS(le16_to_cpu(record->info),
			 HTT_TX_FETCH_RECORD_INFO_TID);
		max_num_msdus = le16_to_cpu(record->num_msdus);
		max_num_bytes = le32_to_cpu(record->num_bytes);

		ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch record %i peer_id %hu tid %hhu msdus %zu bytes %zu\n",
			   i, peer_id, tid, max_num_msdus, max_num_bytes);

		if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
		    unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
			ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
				    peer_id, tid);
			continue;
		}

M
Michal Kazior 已提交
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
		spin_lock_bh(&ar->data_lock);
		txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
		spin_unlock_bh(&ar->data_lock);

		/* It is okay to release the lock and use txq because RCU read
		 * lock is held.
		 */

		if (unlikely(!txq)) {
			ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
				    peer_id, tid);
			continue;
		}

		num_msdus = 0;
		num_bytes = 0;

		while (num_msdus < max_num_msdus &&
		       num_bytes < max_num_bytes) {
			ret = ath10k_mac_tx_push_txq(hw, txq);
			if (ret < 0)
				break;

			num_msdus++;
			num_bytes += ret;
		}

		record->num_msdus = cpu_to_le16(num_msdus);
		record->num_bytes = cpu_to_le32(num_bytes);

		ath10k_htt_tx_txq_recalc(hw, txq);
2026 2027
	}

M
Michal Kazior 已提交
2028 2029
	rcu_read_unlock();

2030 2031 2032
	resp_ids = ath10k_htt_get_tx_fetch_ind_resp_ids(&resp->tx_fetch_ind);
	ath10k_htt_rx_tx_fetch_resp_id_confirm(ar, resp_ids, num_resp_ids);

M
Michal Kazior 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042
	ret = ath10k_htt_tx_fetch_resp(ar,
				       resp->tx_fetch_ind.token,
				       resp->tx_fetch_ind.fetch_seq_num,
				       resp->tx_fetch_ind.records,
				       num_records);
	if (unlikely(ret)) {
		ath10k_warn(ar, "failed to submit tx fetch resp for token 0x%08x: %d\n",
			    le32_to_cpu(resp->tx_fetch_ind.token), ret);
		/* FIXME: request fw restart */
	}
2043

M
Michal Kazior 已提交
2044
	ath10k_htt_tx_txq_sync(ar);
2045 2046
}

2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
static void ath10k_htt_rx_tx_fetch_confirm(struct ath10k *ar,
					   struct sk_buff *skb)
{
	const struct htt_resp *resp = (void *)skb->data;
	size_t len;
	int num_resp_ids;

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch confirm\n");

	len = sizeof(resp->hdr) + sizeof(resp->tx_fetch_confirm);
	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_fetch_confirm event: buffer too short\n");
		return;
	}

	num_resp_ids = le16_to_cpu(resp->tx_fetch_confirm.num_resp_ids);
	len += sizeof(resp->tx_fetch_confirm.resp_ids[0]) * num_resp_ids;

	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_fetch_confirm event: resp_ids buffer overflow\n");
		return;
	}

	ath10k_htt_rx_tx_fetch_resp_id_confirm(ar,
					       resp->tx_fetch_confirm.resp_ids,
					       num_resp_ids);
}

static void ath10k_htt_rx_tx_mode_switch_ind(struct ath10k *ar,
					     struct sk_buff *skb)
{
	const struct htt_resp *resp = (void *)skb->data;
	const struct htt_tx_mode_switch_record *record;
M
Michal Kazior 已提交
2080 2081
	struct ieee80211_txq *txq;
	struct ath10k_txq *artxq;
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
	size_t len;
	size_t num_records;
	enum htt_tx_mode_switch_mode mode;
	bool enable;
	u16 info0;
	u16 info1;
	u16 threshold;
	u16 peer_id;
	u8 tid;
	int i;

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx mode switch ind\n");

	len = sizeof(resp->hdr) + sizeof(resp->tx_mode_switch_ind);
	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_mode_switch_ind event: buffer too short\n");
		return;
	}

	info0 = le16_to_cpu(resp->tx_mode_switch_ind.info0);
	info1 = le16_to_cpu(resp->tx_mode_switch_ind.info1);

	enable = !!(info0 & HTT_TX_MODE_SWITCH_IND_INFO0_ENABLE);
	num_records = MS(info0, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);
	mode = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_MODE);
	threshold = MS(info1, HTT_TX_MODE_SWITCH_IND_INFO1_THRESHOLD);

	ath10k_dbg(ar, ATH10K_DBG_HTT,
		   "htt rx tx mode switch ind info0 0x%04hx info1 0x%04hx enable %d num records %zd mode %d threshold %hu\n",
		   info0, info1, enable, num_records, mode, threshold);

	len += sizeof(resp->tx_mode_switch_ind.records[0]) * num_records;

	if (unlikely(skb->len < len)) {
		ath10k_warn(ar, "received corrupted tx_mode_switch_mode_ind event: too many records\n");
		return;
	}

	switch (mode) {
	case HTT_TX_MODE_SWITCH_PUSH:
	case HTT_TX_MODE_SWITCH_PUSH_PULL:
		break;
	default:
		ath10k_warn(ar, "received invalid tx_mode_switch_mode_ind mode %d, ignoring\n",
			    mode);
		return;
	}

	if (!enable)
		return;

M
Michal Kazior 已提交
2133 2134 2135 2136 2137
	ar->htt.tx_q_state.enabled = enable;
	ar->htt.tx_q_state.mode = mode;
	ar->htt.tx_q_state.num_push_allowed = threshold;

	rcu_read_lock();
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151

	for (i = 0; i < num_records; i++) {
		record = &resp->tx_mode_switch_ind.records[i];
		info0 = le16_to_cpu(record->info0);
		peer_id = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_PEER_ID);
		tid = MS(info0, HTT_TX_MODE_SWITCH_RECORD_INFO0_TID);

		if (unlikely(peer_id >= ar->htt.tx_q_state.num_peers) ||
		    unlikely(tid >= ar->htt.tx_q_state.num_tids)) {
			ath10k_warn(ar, "received out of range peer_id %hu tid %hhu\n",
				    peer_id, tid);
			continue;
		}

M
Michal Kazior 已提交
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169
		spin_lock_bh(&ar->data_lock);
		txq = ath10k_mac_txq_lookup(ar, peer_id, tid);
		spin_unlock_bh(&ar->data_lock);

		/* It is okay to release the lock and use txq because RCU read
		 * lock is held.
		 */

		if (unlikely(!txq)) {
			ath10k_warn(ar, "failed to lookup txq for peer_id %hu tid %hhu\n",
				    peer_id, tid);
			continue;
		}

		spin_lock_bh(&ar->htt.tx_lock);
		artxq = (void *)txq->drv_priv;
		artxq->num_push_allowed = le16_to_cpu(record->num_max_msdus);
		spin_unlock_bh(&ar->htt.tx_lock);
2170 2171
	}

M
Michal Kazior 已提交
2172 2173 2174
	rcu_read_unlock();

	ath10k_mac_tx_push_pending(ar);
2175 2176
}

2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
void ath10k_htt_htc_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
{
	bool release;

	release = ath10k_htt_t2h_msg_handler(ar, skb);

	/* Free the indication buffer */
	if (release)
		dev_kfree_skb_any(skb);
}

bool ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
2189
{
2190
	struct ath10k_htt *htt = &ar->htt;
2191
	struct htt_resp *resp = (struct htt_resp *)skb->data;
2192
	enum htt_t2h_msg_type type;
2193 2194 2195

	/* confirm alignment */
	if (!IS_ALIGNED((unsigned long)skb->data, 4))
2196
		ath10k_warn(ar, "unaligned htt message, expect trouble\n");
2197

2198
	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, msg_type: 0x%0X\n",
2199
		   resp->hdr.msg_type);
2200 2201 2202 2203

	if (resp->hdr.msg_type >= ar->htt.t2h_msg_types_max) {
		ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx, unsupported msg_type: 0x%0X\n max: 0x%0X",
			   resp->hdr.msg_type, ar->htt.t2h_msg_types_max);
2204
		return true;
2205 2206 2207 2208
	}
	type = ar->htt.t2h_msg_types[resp->hdr.msg_type];

	switch (type) {
2209 2210 2211 2212 2213 2214
	case HTT_T2H_MSG_TYPE_VERSION_CONF: {
		htt->target_version_major = resp->ver_resp.major;
		htt->target_version_minor = resp->ver_resp.minor;
		complete(&htt->target_version_received);
		break;
	}
2215
	case HTT_T2H_MSG_TYPE_RX_IND:
2216 2217
		ath10k_htt_rx_proc_rx_ind(htt, &resp->rx_ind);
		break;
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
	case HTT_T2H_MSG_TYPE_PEER_MAP: {
		struct htt_peer_map_event ev = {
			.vdev_id = resp->peer_map.vdev_id,
			.peer_id = __le16_to_cpu(resp->peer_map.peer_id),
		};
		memcpy(ev.addr, resp->peer_map.addr, sizeof(ev.addr));
		ath10k_peer_map_event(htt, &ev);
		break;
	}
	case HTT_T2H_MSG_TYPE_PEER_UNMAP: {
		struct htt_peer_unmap_event ev = {
			.peer_id = __le16_to_cpu(resp->peer_unmap.peer_id),
		};
		ath10k_peer_unmap_event(htt, &ev);
		break;
	}
	case HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION: {
		struct htt_tx_done tx_done = {};
		int status = __le32_to_cpu(resp->mgmt_tx_completion.status);

2238
		tx_done.msdu_id = __le32_to_cpu(resp->mgmt_tx_completion.desc_id);
2239 2240 2241

		switch (status) {
		case HTT_MGMT_TX_STATUS_OK:
2242
			tx_done.status = HTT_TX_COMPL_STATE_ACK;
2243 2244
			break;
		case HTT_MGMT_TX_STATUS_RETRY:
2245
			tx_done.status = HTT_TX_COMPL_STATE_NOACK;
2246 2247
			break;
		case HTT_MGMT_TX_STATUS_DROP:
2248
			tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
2249 2250 2251
			break;
		}

2252 2253 2254 2255 2256 2257
		status = ath10k_txrx_tx_unref(htt, &tx_done);
		if (!status) {
			spin_lock_bh(&htt->tx_lock);
			ath10k_htt_tx_mgmt_dec_pending(htt);
			spin_unlock_bh(&htt->tx_lock);
		}
2258 2259
		break;
	}
2260
	case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
2261 2262
		ath10k_htt_rx_tx_compl_ind(htt->ar, skb);
		break;
2263 2264 2265 2266
	case HTT_T2H_MSG_TYPE_SEC_IND: {
		struct ath10k *ar = htt->ar;
		struct htt_security_indication *ev = &resp->security_indication;

2267
		ath10k_dbg(ar, ATH10K_DBG_HTT,
2268 2269 2270 2271 2272 2273 2274 2275
			   "sec ind peer_id %d unicast %d type %d\n",
			  __le16_to_cpu(ev->peer_id),
			  !!(ev->flags & HTT_SECURITY_IS_UNICAST),
			  MS(ev->flags, HTT_SECURITY_TYPE));
		complete(&ar->install_key_done);
		break;
	}
	case HTT_T2H_MSG_TYPE_RX_FRAG_IND: {
2276
		ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2277
				skb->data, skb->len);
2278
		atomic_inc(&htt->num_mpdus_ready);
2279 2280 2281 2282 2283
		break;
	}
	case HTT_T2H_MSG_TYPE_TEST:
		break;
	case HTT_T2H_MSG_TYPE_STATS_CONF:
2284
		trace_ath10k_htt_stats(ar, skb->data, skb->len);
2285 2286
		break;
	case HTT_T2H_MSG_TYPE_TX_INSPECT_IND:
2287 2288 2289 2290 2291
		/* Firmware can return tx frames if it's unable to fully
		 * process them and suspects host may be able to fix it. ath10k
		 * sends all tx frames as already inspected so this shouldn't
		 * happen unless fw has a bug.
		 */
2292
		ath10k_warn(ar, "received an unexpected htt tx inspect event\n");
2293
		break;
2294
	case HTT_T2H_MSG_TYPE_RX_ADDBA:
2295 2296
		ath10k_htt_rx_addba(ar, resp);
		break;
2297
	case HTT_T2H_MSG_TYPE_RX_DELBA:
2298 2299
		ath10k_htt_rx_delba(ar, resp);
		break;
2300 2301
	case HTT_T2H_MSG_TYPE_PKTLOG: {
		trace_ath10k_htt_pktlog(ar, resp->pktlog_msg.payload,
2302 2303 2304
					skb->len -
					offsetof(struct htt_resp,
						 pktlog_msg.payload));
2305 2306
		break;
	}
2307 2308 2309 2310 2311 2312
	case HTT_T2H_MSG_TYPE_RX_FLUSH: {
		/* Ignore this event because mac80211 takes care of Rx
		 * aggregation reordering.
		 */
		break;
	}
2313
	case HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND: {
2314
		__skb_queue_tail(&htt->rx_in_ord_compl_q, skb);
2315
		return false;
2316 2317
	}
	case HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND:
2318
		break;
2319 2320 2321 2322 2323 2324 2325 2326 2327
	case HTT_T2H_MSG_TYPE_CHAN_CHANGE: {
		u32 phymode = __le32_to_cpu(resp->chan_change.phymode);
		u32 freq = __le32_to_cpu(resp->chan_change.freq);

		ar->tgt_oper_chan =
			__ieee80211_get_channel(ar->hw->wiphy, freq);
		ath10k_dbg(ar, ATH10K_DBG_HTT,
			   "htt chan change freq %u phymode %s\n",
			   freq, ath10k_wmi_phymode_str(phymode));
2328
		break;
2329
	}
2330 2331
	case HTT_T2H_MSG_TYPE_AGGR_CONF:
		break;
2332 2333 2334 2335 2336 2337 2338 2339 2340 2341
	case HTT_T2H_MSG_TYPE_TX_FETCH_IND: {
		struct sk_buff *tx_fetch_ind = skb_copy(skb, GFP_ATOMIC);

		if (!tx_fetch_ind) {
			ath10k_warn(ar, "failed to copy htt tx fetch ind\n");
			break;
		}
		skb_queue_tail(&htt->tx_fetch_ind_q, tx_fetch_ind);
		break;
	}
M
Michal Kazior 已提交
2342
	case HTT_T2H_MSG_TYPE_TX_FETCH_CONFIRM:
2343 2344
		ath10k_htt_rx_tx_fetch_confirm(ar, skb);
		break;
M
Michal Kazior 已提交
2345
	case HTT_T2H_MSG_TYPE_TX_MODE_SWITCH_IND:
2346
		ath10k_htt_rx_tx_mode_switch_ind(ar, skb);
2347 2348
		break;
	case HTT_T2H_MSG_TYPE_EN_STATS:
2349
	default:
2350 2351
		ath10k_warn(ar, "htt event (%d) not handled\n",
			    resp->hdr.msg_type);
2352
		ath10k_dbg_dump(ar, ATH10K_DBG_HTT_DUMP, NULL, "htt event: ",
2353 2354 2355
				skb->data, skb->len);
		break;
	};
2356
	return true;
2357
}
2358
EXPORT_SYMBOL(ath10k_htt_t2h_msg_handler);
2359

2360 2361 2362
void ath10k_htt_rx_pktlog_completion_handler(struct ath10k *ar,
					     struct sk_buff *skb)
{
2363
	trace_ath10k_htt_pktlog(ar, skb->data, skb->len);
2364 2365 2366 2367
	dev_kfree_skb_any(skb);
}
EXPORT_SYMBOL(ath10k_htt_rx_pktlog_completion_handler);

2368
int ath10k_htt_txrx_compl_task(struct ath10k *ar, int budget)
2369
{
2370
	struct ath10k_htt *htt = &ar->htt;
2371
	struct htt_tx_done tx_done = {};
M
Michal Kazior 已提交
2372
	struct sk_buff_head tx_ind_q;
2373
	struct sk_buff *skb;
2374
	unsigned long flags;
2375 2376
	int quota = 0, done, num_rx_msdus;
	bool resched_napi = false;
2377

M
Michal Kazior 已提交
2378
	__skb_queue_head_init(&tx_ind_q);
2379

2380 2381 2382 2383 2384 2385
	/* Since in-ord-ind can deliver more than 1 A-MSDU in single event,
	 * process it first to utilize full available quota.
	 */
	while (quota < budget) {
		if (skb_queue_empty(&htt->rx_in_ord_compl_q))
			break;
2386

2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438
		skb = __skb_dequeue(&htt->rx_in_ord_compl_q);
		if (!skb) {
			resched_napi = true;
			goto exit;
		}

		spin_lock_bh(&htt->rx_ring.lock);
		num_rx_msdus = ath10k_htt_rx_in_ord_ind(ar, skb);
		spin_unlock_bh(&htt->rx_ring.lock);
		if (num_rx_msdus < 0) {
			resched_napi = true;
			goto exit;
		}

		dev_kfree_skb_any(skb);
		if (num_rx_msdus > 0)
			quota += num_rx_msdus;

		if ((quota > ATH10K_NAPI_QUOTA_LIMIT) &&
		    !skb_queue_empty(&htt->rx_in_ord_compl_q)) {
			resched_napi = true;
			goto exit;
		}
	}

	while (quota < budget) {
		/* no more data to receive */
		if (!atomic_read(&htt->num_mpdus_ready))
			break;

		num_rx_msdus = ath10k_htt_rx_handle_amsdu(htt);
		if (num_rx_msdus < 0) {
			resched_napi = true;
			goto exit;
		}

		quota += num_rx_msdus;
		atomic_dec(&htt->num_mpdus_ready);
		if ((quota > ATH10K_NAPI_QUOTA_LIMIT) &&
		    atomic_read(&htt->num_mpdus_ready)) {
			resched_napi = true;
			goto exit;
		}
	}

	/* From NAPI documentation:
	 *  The napi poll() function may also process TX completions, in which
	 *  case if it processes the entire TX ring then it should count that
	 *  work as the rest of the budget.
	 */
	if ((quota < budget) && !kfifo_is_empty(&htt->txdone_fifo))
		quota = budget;
M
Michal Kazior 已提交
2439

2440 2441 2442 2443 2444 2445 2446
	/* kfifo_get: called only within txrx_tasklet so it's neatly serialized.
	 * From kfifo_get() documentation:
	 *  Note that with only one concurrent reader and one concurrent writer,
	 *  you don't need extra locking to use these macro.
	 */
	while (kfifo_get(&htt->txdone_fifo, &tx_done))
		ath10k_txrx_tx_unref(htt, &tx_done);
2447

2448 2449
	ath10k_mac_tx_push_pending(ar);

2450 2451 2452 2453
	spin_lock_irqsave(&htt->tx_fetch_ind_q.lock, flags);
	skb_queue_splice_init(&htt->tx_fetch_ind_q, &tx_ind_q);
	spin_unlock_irqrestore(&htt->tx_fetch_ind_q.lock, flags);

M
Michal Kazior 已提交
2454 2455
	while ((skb = __skb_dequeue(&tx_ind_q))) {
		ath10k_htt_rx_tx_fetch_ind(ar, skb);
2456 2457 2458
		dev_kfree_skb_any(skb);
	}

2459
exit:
2460
	ath10k_htt_rx_msdu_buff_replenish(htt);
2461 2462 2463 2464 2465 2466
	/* In case of rx failure or more data to read, report budget
	 * to reschedule NAPI poll
	 */
	done = resched_napi ? budget : quota;

	return done;
2467
}
2468
EXPORT_SYMBOL(ath10k_htt_txrx_compl_task);