drivers/net/wireless/ath/ath10k/txrx.c - kernel/bruno - Git at Google

 /*
  * 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.
  */

 #include "core.h"
 #include "txrx.h"
 #include "htt.h"
 #include "mac.h"
 #include "debug.h"

 static void ath10k_report_offchan_tx(struct ath10k *ar, struct sk_buff *skb)
 {
 	if (!ATH10K_SKB_CB(skb)->htt.is_offchan)
 		return;

 	/* If the original wait_for_completion() timed out before
 	 * {data,mgmt}_tx_completed() was called then we could complete
 	 * offchan_tx_completed for a different skb. Prevent this by using
 	 * offchan_tx_skb. */
 	spin_lock_bh(&ar->data_lock);
 	if (ar->offchan_tx_skb != skb) {
 		ath10k_warn(ar, "completed old offchannel frame\n");
 		goto out;
 	}

 	complete(&ar->offchan_tx_completed);
 	ar->offchan_tx_skb = NULL; /* just for sanity */

 	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
 out:
 	spin_unlock_bh(&ar->data_lock);
 }

 void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 			  const struct htt_tx_done *tx_done)
 {
 	struct ath10k *ar = htt->ar;
 	struct device *dev = ar->dev;
 	struct ieee80211_tx_info *info;
 	struct ath10k_skb_cb *skb_cb;
 	struct sk_buff *msdu;
 	struct ieee80211_hdr *hdr;
 	__le16 fc;
 	bool limit_mgmt_desc = false;

 	ath10k_dbg(ar, ATH10K_DBG_HTT,
 		   "htt tx completion msdu_id %u discard %d no_ack %d success %d\n",
 		   tx_done->msdu_id, !!tx_done->discard,
 		   !!tx_done->no_ack, !!tx_done->success);

 	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
 		ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
 			    tx_done->msdu_id);
 		return;
 	}

 	spin_lock_bh(&htt->tx_lock);
 	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
 	if (!msdu) {
 		ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
 			    tx_done->msdu_id);
 		spin_unlock_bh(&htt->tx_lock);
 		return;
 	}

 	hdr = (struct ieee80211_hdr *)msdu->data;
 	fc = hdr->frame_control;

 	if (unlikely(ieee80211_is_mgmt(fc)) &&
 	    ar->hw_params.max_probe_resp_desc_thres)
 		limit_mgmt_desc = true;

 	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
 	__ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc);
 	if (htt->num_pending_tx == 0)
 		wake_up(&htt->empty_tx_wq);
 	spin_unlock_bh(&htt->tx_lock);

 	skb_cb = ATH10K_SKB_CB(msdu);
 	dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);

 	ath10k_report_offchan_tx(htt->ar, msdu);

 	info = IEEE80211_SKB_CB(msdu);
 	memset(&info->status, 0, sizeof(info->status));
 	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);

 	if (tx_done->discard) {
 		ieee80211_free_txskb(htt->ar->hw, msdu);
 		return;
 	}

 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 		info->flags |= IEEE80211_TX_STAT_ACK;

 	if (tx_done->no_ack)
 		info->flags &= ~IEEE80211_TX_STAT_ACK;

 	if (tx_done->success && (info->flags & IEEE80211_TX_CTL_NO_ACK))
 		info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;

 	ieee80211_tx_status(htt->ar->hw, msdu);
 	/* we do not own the msdu anymore */
 }

 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 				     const u8 *addr)
 {
 	struct ath10k_peer *peer;

 	lockdep_assert_held(&ar->data_lock);

 	list_for_each_entry(peer, &ar->peers, list) {
 		if (peer->vdev_id != vdev_id)
 			continue;
 		if (memcmp(peer->addr, addr, ETH_ALEN))
 			continue;

 		return peer;
 	}

 	return NULL;
 }

 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 {
 	struct ath10k_peer *peer;

 	lockdep_assert_held(&ar->data_lock);

 	list_for_each_entry(peer, &ar->peers, list)
 		if (test_bit(peer_id, peer->peer_ids))
 			return peer;

 	return NULL;
 }

 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 				       const u8 *addr, bool expect_mapped)
 {
 	long time_left;

 	time_left = wait_event_timeout(ar->peer_mapping_wq, ({
 			bool mapped;

 			spin_lock_bh(&ar->data_lock);
 			mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 			spin_unlock_bh(&ar->data_lock);

 			(mapped == expect_mapped ||
 			 test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
 		}), 3*HZ);

 	if (time_left == 0)
 		return -ETIMEDOUT;

 	return 0;
 }

 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 {
 	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 }

 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 {
 	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 }

 void ath10k_peer_map_event(struct ath10k_htt *htt,
 			   struct htt_peer_map_event *ev)
 {
 	struct ath10k *ar = htt->ar;
 	struct ath10k_peer *peer;

 	spin_lock_bh(&ar->data_lock);
 	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 	if (!peer) {
 		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 		if (!peer)
 			goto exit;

 		peer->vdev_id = ev->vdev_id;
 		ether_addr_copy(peer->addr, ev->addr);
 		list_add(&peer->list, &ar->peers);
 		wake_up(&ar->peer_mapping_wq);
 	}

 	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 		   ev->vdev_id, ev->addr, ev->peer_id);

 	set_bit(ev->peer_id, peer->peer_ids);
 exit:
 	spin_unlock_bh(&ar->data_lock);
 }

 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 			     struct htt_peer_unmap_event *ev)
 {
 	struct ath10k *ar = htt->ar;
 	struct ath10k_peer *peer;

 	spin_lock_bh(&ar->data_lock);
 	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 	if (!peer) {
 		ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
 			    ev->peer_id);
 		goto exit;
 	}

 	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 		   peer->vdev_id, peer->addr, ev->peer_id);

 	clear_bit(ev->peer_id, peer->peer_ids);

 	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 		list_del(&peer->list);
 		kfree(peer);
 		wake_up(&ar->peer_mapping_wq);
 	}

 exit:
 	spin_unlock_bh(&ar->data_lock);
 }
	/*
	* 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.
	*/

	#include "core.h"
	#include "txrx.h"
	#include "htt.h"
	#include "mac.h"
	#include "debug.h"

	static void ath10k_report_offchan_tx(struct ath10k ar, struct sk_buff skb)
	{
	if (!ATH10K_SKB_CB(skb)->htt.is_offchan)
	return;

	/* If the original wait_for_completion() timed out before
	* {data,mgmt}_tx_completed() was called then we could complete
	* offchan_tx_completed for a different skb. Prevent this by using
	* offchan_tx_skb. */
	spin_lock_bh(&ar->data_lock);
	if (ar->offchan_tx_skb != skb) {
	ath10k_warn(ar, "completed old offchannel frame\n");
	goto out;
	}

	complete(&ar->offchan_tx_completed);
	ar->offchan_tx_skb = NULL; /* just for sanity */

	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
	out:
	spin_unlock_bh(&ar->data_lock);
	}

	void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
	const struct htt_tx_done *tx_done)
	{
	struct ath10k *ar = htt->ar;
	struct device *dev = ar->dev;
	struct ieee80211_tx_info *info;
	struct ath10k_skb_cb *skb_cb;
	struct sk_buff *msdu;
	struct ieee80211_hdr *hdr;
	__le16 fc;
	bool limit_mgmt_desc = false;

	ath10k_dbg(ar, ATH10K_DBG_HTT,
	"htt tx completion msdu_id %u discard %d no_ack %d success %d\n",
	tx_done->msdu_id, !!tx_done->discard,
	!!tx_done->no_ack, !!tx_done->success);

	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
	ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
	tx_done->msdu_id);
	return;
	}

	spin_lock_bh(&htt->tx_lock);
	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
	if (!msdu) {
	ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
	tx_done->msdu_id);
	spin_unlock_bh(&htt->tx_lock);
	return;
	}

	hdr = (struct ieee80211_hdr *)msdu->data;
	fc = hdr->frame_control;

	if (unlikely(ieee80211_is_mgmt(fc)) &&
	ar->hw_params.max_probe_resp_desc_thres)
	limit_mgmt_desc = true;

	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
	__ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc);
	if (htt->num_pending_tx == 0)
	wake_up(&htt->empty_tx_wq);
	spin_unlock_bh(&htt->tx_lock);

	skb_cb = ATH10K_SKB_CB(msdu);
	dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);

	ath10k_report_offchan_tx(htt->ar, msdu);

	info = IEEE80211_SKB_CB(msdu);
	memset(&info->status, 0, sizeof(info->status));
	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);

	if (tx_done->discard) {
	ieee80211_free_txskb(htt->ar->hw, msdu);
	return;
	}

	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
	info->flags \|= IEEE80211_TX_STAT_ACK;

	if (tx_done->no_ack)
	info->flags &= ~IEEE80211_TX_STAT_ACK;

	if (tx_done->success && (info->flags & IEEE80211_TX_CTL_NO_ACK))
	info->flags \|= IEEE80211_TX_STAT_NOACK_TRANSMITTED;

	ieee80211_tx_status(htt->ar->hw, msdu);
	/* we do not own the msdu anymore */
	}

	struct ath10k_peer ath10k_peer_find(struct ath10k ar, int vdev_id,
	const u8 *addr)
	{
	struct ath10k_peer *peer;

	lockdep_assert_held(&ar->data_lock);

	list_for_each_entry(peer, &ar->peers, list) {
	if (peer->vdev_id != vdev_id)
	continue;
	if (memcmp(peer->addr, addr, ETH_ALEN))
	continue;

	return peer;
	}

	return NULL;
	}

	struct ath10k_peer ath10k_peer_find_by_id(struct ath10k ar, int peer_id)
	{
	struct ath10k_peer *peer;

	lockdep_assert_held(&ar->data_lock);

	list_for_each_entry(peer, &ar->peers, list)
	if (test_bit(peer_id, peer->peer_ids))
	return peer;

	return NULL;
	}

	static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
	const u8 *addr, bool expect_mapped)
	{
	long time_left;

	time_left = wait_event_timeout(ar->peer_mapping_wq, ({
	bool mapped;

	spin_lock_bh(&ar->data_lock);
	mapped = !!ath10k_peer_find(ar, vdev_id, addr);
	spin_unlock_bh(&ar->data_lock);

	(mapped == expect_mapped \|\|
	test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
	}), 3*HZ);

	if (time_left == 0)
	return -ETIMEDOUT;

	return 0;
	}

	int ath10k_wait_for_peer_created(struct ath10k ar, int vdev_id, const u8 addr)
	{
	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
	}

	int ath10k_wait_for_peer_deleted(struct ath10k ar, int vdev_id, const u8 addr)
	{
	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
	}

	void ath10k_peer_map_event(struct ath10k_htt *htt,
	struct htt_peer_map_event *ev)
	{
	struct ath10k *ar = htt->ar;
	struct ath10k_peer *peer;

	spin_lock_bh(&ar->data_lock);
	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
	if (!peer) {
	peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
	if (!peer)
	goto exit;

	peer->vdev_id = ev->vdev_id;
	ether_addr_copy(peer->addr, ev->addr);
	list_add(&peer->list, &ar->peers);
	wake_up(&ar->peer_mapping_wq);
	}

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
	ev->vdev_id, ev->addr, ev->peer_id);

	set_bit(ev->peer_id, peer->peer_ids);
	exit:
	spin_unlock_bh(&ar->data_lock);
	}

	void ath10k_peer_unmap_event(struct ath10k_htt *htt,
	struct htt_peer_unmap_event *ev)
	{
	struct ath10k *ar = htt->ar;
	struct ath10k_peer *peer;

	spin_lock_bh(&ar->data_lock);
	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
	if (!peer) {
	ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
	ev->peer_id);
	goto exit;
	}

	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
	peer->vdev_id, peer->addr, ev->peer_id);

	clear_bit(ev->peer_id, peer->peer_ids);

	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
	list_del(&peer->list);
	kfree(peer);
	wake_up(&ar->peer_mapping_wq);
	}

	exit:
	spin_unlock_bh(&ar->data_lock);
	}