[linux-2.6-block.git] / drivers / net / wireless / ath / ath10k / txrx.c

/*
 * 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;

	lockdep_assert_held(&htt->tx_lock);

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

	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;
	}

	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);
		return;
	}

	skb_cb = ATH10K_SKB_CB(msdu);

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

	if (skb_cb->htt.txbuf)
		dma_pool_free(htt->tx_pool,
			      skb_cb->htt.txbuf,
			      skb_cb->htt.txbuf_paddr);

	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);
		goto exit;
	}

	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;

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

exit:
	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
	__ath10k_htt_tx_dec_pending(htt);
	if (htt->num_pending_tx == 0)
		wake_up(&htt->empty_tx_wq);
}

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)
{
	int ret;

	ret = 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 (ret <= 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);
}
Commit	Line	Data
5e3dd157 KV	1	/*
	2	* Copyright (c) 2005-2011 Atheros Communications Inc.
	3	* Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
	4	*
	5	* Permission to use, copy, modify, and/or distribute this software for any
	6	* purpose with or without fee is hereby granted, provided that the above
	7	* copyright notice and this permission notice appear in all copies.
	8	*
	9	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	10	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	11	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	12	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	13	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	14	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	15	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	16	*/
	17
	18	#include "core.h"
	19	#include "txrx.h"
	20	#include "htt.h"
	21	#include "mac.h"
	22	#include "debug.h"
	23
	24	static void ath10k_report_offchan_tx(struct ath10k ar, struct sk_buff skb)
	25	{
	26	if (!ATH10K_SKB_CB(skb)->htt.is_offchan)
	27	return;
	28
	29	/* If the original wait_for_completion() timed out before
	30	* {data,mgmt}_tx_completed() was called then we could complete
	31	* offchan_tx_completed for a different skb. Prevent this by using
	32	* offchan_tx_skb. */
	33	spin_lock_bh(&ar->data_lock);
	34	if (ar->offchan_tx_skb != skb) {
7aa7a72a	35	ath10k_warn(ar, "completed old offchannel frame\n");
5e3dd157 KV	36	goto out;
	37	}
	38
	39	complete(&ar->offchan_tx_completed);
	40	ar->offchan_tx_skb = NULL; /* just for sanity */
	41
7aa7a72a	42	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
5e3dd157 KV	43	out:
	44	spin_unlock_bh(&ar->data_lock);
	45	}
	46
0a89f8a0 MK	47	void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
0a89f8a0 MK	48	const struct htt_tx_done *tx_done)
5e3dd157	49	{
7aa7a72a MK	50	struct ath10k *ar = htt->ar;
7aa7a72a MK	51	struct device *dev = ar->dev;
5e3dd157	52	struct ieee80211_tx_info *info;
1f8bb151 MK	53	struct ath10k_skb_cb *skb_cb;
1f8bb151 MK	54	struct sk_buff *msdu;
5e3dd157	55
45967089 MK	56	lockdep_assert_held(&htt->tx_lock);
45967089 MK	57
7aa7a72a	58	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion msdu_id %u discard %d no_ack %d\n",
0a89f8a0	59	tx_done->msdu_id, !!tx_done->discard, !!tx_done->no_ack);
5e3dd157	60
0a89f8a0	61	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
7aa7a72a	62	ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
0a89f8a0	63	tx_done->msdu_id);
5e3dd157	64	return;
0a89f8a0 MK	65	}
0a89f8a0 MK	66
89d6d835 MK	67	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
	68	if (!msdu) {
	69	ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
	70	tx_done->msdu_id);
	71	return;
	72	}
	73
1f8bb151	74	skb_cb = ATH10K_SKB_CB(msdu);
5e3dd157	75
767d34fc	76	dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
5e3dd157	77
a16942e6 MK	78	if (skb_cb->htt.txbuf)
	79	dma_pool_free(htt->tx_pool,
	80	skb_cb->htt.txbuf,
	81	skb_cb->htt.txbuf_paddr);
1f8bb151	82
5e3dd157 KV	83	ath10k_report_offchan_tx(htt->ar, msdu);
	84
	85	info = IEEE80211_SKB_CB(msdu);
6d33a9a6	86	memset(&info->status, 0, sizeof(info->status));
d1e50f47	87	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
5e3dd157	88
0a89f8a0	89	if (tx_done->discard) {
5e3dd157 KV	90	ieee80211_free_txskb(htt->ar->hw, msdu);
	91	goto exit;
	92	}
	93
	94	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
	95	info->flags \|= IEEE80211_TX_STAT_ACK;
	96
0a89f8a0	97	if (tx_done->no_ack)
5e3dd157 KV	98	info->flags &= ~IEEE80211_TX_STAT_ACK;
	99
	100	ieee80211_tx_status(htt->ar->hw, msdu);
	101	/* we do not own the msdu anymore */
	102
	103	exit:
0a89f8a0	104	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
5e3dd157	105	__ath10k_htt_tx_dec_pending(htt);
0945baf7	106	if (htt->num_pending_tx == 0)
5e3dd157	107	wake_up(&htt->empty_tx_wq);
5e3dd157 KV	108	}
5e3dd157 KV	109
5e3dd157 KV	110	struct ath10k_peer ath10k_peer_find(struct ath10k ar, int vdev_id,
	111	const u8 *addr)
	112	{
	113	struct ath10k_peer *peer;
	114
	115	lockdep_assert_held(&ar->data_lock);
	116
	117	list_for_each_entry(peer, &ar->peers, list) {
	118	if (peer->vdev_id != vdev_id)
	119	continue;
	120	if (memcmp(peer->addr, addr, ETH_ALEN))
	121	continue;
	122
	123	return peer;
	124	}
	125
	126	return NULL;
	127	}
	128
aa5b4fbc	129	struct ath10k_peer ath10k_peer_find_by_id(struct ath10k ar, int peer_id)
5e3dd157 KV	130	{
	131	struct ath10k_peer *peer;
	132
	133	lockdep_assert_held(&ar->data_lock);
	134
	135	list_for_each_entry(peer, &ar->peers, list)
	136	if (test_bit(peer_id, peer->peer_ids))
	137	return peer;
	138
	139	return NULL;
	140	}
	141
	142	static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
	143	const u8 *addr, bool expect_mapped)
	144	{
	145	int ret;
	146
	147	ret = wait_event_timeout(ar->peer_mapping_wq, ({
	148	bool mapped;
	149
	150	spin_lock_bh(&ar->data_lock);
	151	mapped = !!ath10k_peer_find(ar, vdev_id, addr);
	152	spin_unlock_bh(&ar->data_lock);
	153
7962b0d8 MK	154	(mapped == expect_mapped \|\|
7962b0d8 MK	155	test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
5e3dd157 KV	156	}), 3*HZ);
	157
	158	if (ret <= 0)
	159	return -ETIMEDOUT;
	160
	161	return 0;
	162	}
	163
	164	int ath10k_wait_for_peer_created(struct ath10k ar, int vdev_id, const u8 addr)
	165	{
	166	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
	167	}
	168
	169	int ath10k_wait_for_peer_deleted(struct ath10k ar, int vdev_id, const u8 addr)
	170	{
	171	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
	172	}
	173
	174	void ath10k_peer_map_event(struct ath10k_htt *htt,
	175	struct htt_peer_map_event *ev)
	176	{
	177	struct ath10k *ar = htt->ar;
	178	struct ath10k_peer *peer;
	179
	180	spin_lock_bh(&ar->data_lock);
	181	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
	182	if (!peer) {
	183	peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
	184	if (!peer)
	185	goto exit;
	186
	187	peer->vdev_id = ev->vdev_id;
b25f32cb	188	ether_addr_copy(peer->addr, ev->addr);
5e3dd157 KV	189	list_add(&peer->list, &ar->peers);
	190	wake_up(&ar->peer_mapping_wq);
	191	}
	192
7aa7a72a	193	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
5e3dd157 KV	194	ev->vdev_id, ev->addr, ev->peer_id);
	195
	196	set_bit(ev->peer_id, peer->peer_ids);
	197	exit:
	198	spin_unlock_bh(&ar->data_lock);
	199	}
	200
	201	void ath10k_peer_unmap_event(struct ath10k_htt *htt,
	202	struct htt_peer_unmap_event *ev)
	203	{
	204	struct ath10k *ar = htt->ar;
	205	struct ath10k_peer *peer;
	206
	207	spin_lock_bh(&ar->data_lock);
	208	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
	209	if (!peer) {
7aa7a72a	210	ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
9ba4c787	211	ev->peer_id);
5e3dd157 KV	212	goto exit;
	213	}
	214
7aa7a72a	215	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
5e3dd157 KV	216	peer->vdev_id, peer->addr, ev->peer_id);
	217
	218	clear_bit(ev->peer_id, peer->peer_ids);
	219
	220	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
	221	list_del(&peer->list);
	222	kfree(peer);
	223	wake_up(&ar->peer_mapping_wq);
	224	}
	225
	226	exit:
	227	spin_unlock_bh(&ar->data_lock);
	228	}