[deliverable/linux.git] / drivers / net / wireless / mwifiex / uap_txrx.c

/*
 * Marvell Wireless LAN device driver: AP TX and RX data handling
 *
 * Copyright (C) 2012, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "main.h"
#include "wmm.h"
#include "11n_aggr.h"
#include "11n_rxreorder.h"

static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
					 struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct uap_rxpd *uap_rx_pd;
	struct rx_packet_hdr *rx_pkt_hdr;
	struct sk_buff *new_skb;
	struct mwifiex_txinfo *tx_info;
	int hdr_chop;
	struct timeval tv;
	u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);

	if ((atomic_read(&adapter->pending_bridged_pkts) >=
					     MWIFIEX_BRIDGED_PKTS_THRESHOLD)) {
		dev_err(priv->adapter->dev,
			"Tx: Bridge packet limit reached. Drop packet!\n");
		kfree_skb(skb);
		return;
	}

	if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
		    rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)))
		/* Chop off the rxpd + the excess memory from
		 * 802.2/llc/snap header that was removed.
		 */
		hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd;
	else
		/* Chop off the rxpd */
		hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;

	/* Chop off the leading header bytes so the it points
	 * to the start of either the reconstructed EthII frame
	 * or the 802.2/llc/snap frame.
	 */
	skb_pull(skb, hdr_chop);

	if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
		dev_dbg(priv->adapter->dev,
			"data: Tx: insufficient skb headroom %d\n",
			skb_headroom(skb));
		/* Insufficient skb headroom - allocate a new skb */
		new_skb =
			skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
		if (unlikely(!new_skb)) {
			dev_err(priv->adapter->dev,
				"Tx: cannot allocate new_skb\n");
			kfree_skb(skb);
			priv->stats.tx_dropped++;
			return;
		}

		kfree_skb(skb);
		skb = new_skb;
		dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
			skb_headroom(skb));
	}

	tx_info = MWIFIEX_SKB_TXCB(skb);
	tx_info->bss_num = priv->bss_num;
	tx_info->bss_type = priv->bss_type;
	tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;

	do_gettimeofday(&tv);
	skb->tstamp = timeval_to_ktime(tv);
	mwifiex_wmm_add_buf_txqueue(priv, skb);
	atomic_inc(&adapter->tx_pending);
	atomic_inc(&adapter->pending_bridged_pkts);

	if ((atomic_read(&adapter->tx_pending) >= MAX_TX_PENDING)) {
		mwifiex_set_trans_start(priv->netdev);
		mwifiex_stop_net_dev_queue(priv->netdev, priv->adapter);
	}
	return;
}

/*
 * This function contains logic for AP packet forwarding.
 *
 * If a packet is multicast/broadcast, it is sent to kernel/upper layer
 * as well as queued back to AP TX queue so that it can be sent to other
 * associated stations.
 * If a packet is unicast and RA is present in associated station list,
 * it is again requeued into AP TX queue.
 * If a packet is unicast and RA is not in associated station list,
 * packet is forwarded to kernel to handle routing logic.
 */
int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
				  struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct uap_rxpd *uap_rx_pd;
	struct rx_packet_hdr *rx_pkt_hdr;
	u8 ra[ETH_ALEN];
	struct sk_buff *skb_uap;

	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);

	/* don't do packet forwarding in disconnected state */
	if (!priv->media_connected) {
		dev_err(adapter->dev, "drop packet in disconnected state.\n");
		dev_kfree_skb_any(skb);
		return 0;
	}

	memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);

	if (is_multicast_ether_addr(ra)) {
		skb_uap = skb_copy(skb, GFP_ATOMIC);
		mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
	} else {
		if (mwifiex_get_sta_entry(priv, ra)) {
			/* Requeue Intra-BSS packet */
			mwifiex_uap_queue_bridged_pkt(priv, skb);
			return 0;
		}
	}

	/* Forward unicat/Inter-BSS packets to kernel. */
	return mwifiex_process_rx_packet(adapter, skb);
}

/*
 * This function processes the packet received on AP interface.
 *
 * The function looks into the RxPD and performs sanity tests on the
 * received buffer to ensure its a valid packet before processing it
 * further. If the packet is determined to be aggregated, it is
 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
 *
 * The completion callback is called after processing is complete.
 */
int mwifiex_process_uap_rx_packet(struct mwifiex_adapter *adapter,
				  struct sk_buff *skb)
{
	int ret;
	struct uap_rxpd *uap_rx_pd;
	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
	struct rx_packet_hdr *rx_pkt_hdr;
	u16 rx_pkt_type;
	u8 ta[ETH_ALEN], pkt_type;
	struct mwifiex_sta_node *node;

	struct mwifiex_private *priv =
			mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
					       rx_info->bss_type);

	if (!priv)
		return -1;

	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);

	if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
	     le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
		dev_err(adapter->dev,
			"wrong rx packet: len=%d, offset=%d, length=%d\n",
			skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
			le16_to_cpu(uap_rx_pd->rx_pkt_length));
		priv->stats.rx_dropped++;

		if (adapter->if_ops.data_complete)
			adapter->if_ops.data_complete(adapter, skb);
		else
			dev_kfree_skb_any(skb);

		return 0;
	}

	if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
		struct sk_buff_head list;
		struct sk_buff *rx_skb;

		__skb_queue_head_init(&list);
		skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
		skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));

		ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
					 priv->wdev->iftype, 0, false);

		while (!skb_queue_empty(&list)) {
			rx_skb = __skb_dequeue(&list);
			ret = mwifiex_recv_packet(adapter, rx_skb);
			if (ret)
				dev_err(adapter->dev,
					"AP:Rx A-MSDU failed");
		}

		return 0;
	} else if (rx_pkt_type == PKT_TYPE_MGMT) {
		ret = mwifiex_process_mgmt_packet(adapter, skb);
		if (ret)
			dev_err(adapter->dev, "Rx of mgmt packet failed");
		dev_kfree_skb_any(skb);
		return ret;
	}

	memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);

	if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
		node = mwifiex_get_sta_entry(priv, ta);
		if (node)
			node->rx_seq[uap_rx_pd->priority] =
						le16_to_cpu(uap_rx_pd->seq_num);
	}

	if (!priv->ap_11n_enabled ||
	    (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
	    (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
		ret = mwifiex_handle_uap_rx_forward(priv, skb);
		return ret;
	}

	/* Reorder and send to kernel */
	pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
	ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
					 uap_rx_pd->priority, ta, pkt_type,
					 skb);

	if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
		if (adapter->if_ops.data_complete)
			adapter->if_ops.data_complete(adapter, skb);
		else
			dev_kfree_skb_any(skb);
	}

	if (ret)
		priv->stats.rx_dropped++;

	return ret;
}

/*
 * This function fills the TxPD for AP tx packets.
 *
 * The Tx buffer received by this function should already have the
 * header space allocated for TxPD.
 *
 * This function inserts the TxPD in between interface header and actual
 * data and adjusts the buffer pointers accordingly.
 *
 * The following TxPD fields are set by this function, as required -
 *      - BSS number
 *      - Tx packet length and offset
 *      - Priority
 *      - Packet delay
 *      - Priority specific Tx control
 *      - Flags
 */
void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
			       struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct uap_txpd *txpd;
	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
	int pad, len;

	if (!skb->len) {
		dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
		tx_info->status_code = -1;
		return skb->data;
	}

	/* If skb->data is not aligned, add padding */
	pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;

	len = sizeof(*txpd) + pad;

	BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);

	skb_push(skb, len);

	txpd = (struct uap_txpd *)skb->data;
	memset(txpd, 0, sizeof(*txpd));
	txpd->bss_num = priv->bss_num;
	txpd->bss_type = priv->bss_type;
	txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));

	txpd->priority = (u8)skb->priority;
	txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);

	if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
		/*
		 * Set the priority specific tx_control field, setting of 0 will
		 * cause the default value to be used later in this function.
		 */
		txpd->tx_control =
		    cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);

	/* Offset of actual data */
	txpd->tx_pkt_offset = cpu_to_le16(len);

	/* make space for INTF_HEADER_LEN */
	skb_push(skb, INTF_HEADER_LEN);

	if (!txpd->tx_control)
		/* TxCtrl set by user or default */
		txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);

	return skb->data;
}
Commit	Line	Data
838e4f44 AP	1	/*
	2	* Marvell Wireless LAN device driver: AP TX and RX data handling
	3	*
	4	* Copyright (C) 2012, Marvell International Ltd.
	5	*
	6	* This software file (the "File") is distributed by Marvell International
	7	* Ltd. under the terms of the GNU General Public License Version 2, June 1991
	8	* (the "License"). You may use, redistribute and/or modify this File in
	9	* accordance with the terms and conditions of the License, a copy of which
	10	* is available by writing to the Free Software Foundation, Inc.,
	11	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
	12	* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
	13	*
	14	* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
	16	* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
	17	* this warranty disclaimer.
	18	*/
	19
	20	#include "decl.h"
	21	#include "ioctl.h"
	22	#include "main.h"
	23	#include "wmm.h"
d1cf3b95 AP	24	#include "11n_aggr.h"
d1cf3b95 AP	25	#include "11n_rxreorder.h"
838e4f44 AP	26
	27	static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
	28	struct sk_buff *skb)
	29	{
	30	struct mwifiex_adapter *adapter = priv->adapter;
	31	struct uap_rxpd *uap_rx_pd;
	32	struct rx_packet_hdr *rx_pkt_hdr;
	33	struct sk_buff *new_skb;
	34	struct mwifiex_txinfo *tx_info;
	35	int hdr_chop;
	36	struct timeval tv;
	37	u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	38
	39	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	40	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	41
	42	if ((atomic_read(&adapter->pending_bridged_pkts) >=
	43	MWIFIEX_BRIDGED_PKTS_THRESHOLD)) {
	44	dev_err(priv->adapter->dev,
	45	"Tx: Bridge packet limit reached. Drop packet!\n");
	46	kfree_skb(skb);
	47	return;
	48	}
	49
	50	if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
	51	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)))
	52	/* Chop off the rxpd + the excess memory from
	53	* 802.2/llc/snap header that was removed.
	54	*/
	55	hdr_chop = (u8 )eth_hdr - (u8 )uap_rx_pd;
	56	else
	57	/* Chop off the rxpd */
	58	hdr_chop = (u8 )&rx_pkt_hdr->eth803_hdr - (u8 )uap_rx_pd;
	59
	60	/* Chop off the leading header bytes so the it points
	61	* to the start of either the reconstructed EthII frame
	62	* or the 802.2/llc/snap frame.
	63	*/
	64	skb_pull(skb, hdr_chop);
	65
	66	if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
	67	dev_dbg(priv->adapter->dev,
	68	"data: Tx: insufficient skb headroom %d\n",
	69	skb_headroom(skb));
	70	/* Insufficient skb headroom - allocate a new skb */
	71	new_skb =
	72	skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
	73	if (unlikely(!new_skb)) {
	74	dev_err(priv->adapter->dev,
	75	"Tx: cannot allocate new_skb\n");
	76	kfree_skb(skb);
	77	priv->stats.tx_dropped++;
	78	return;
	79	}
	80
	81	kfree_skb(skb);
	82	skb = new_skb;
	83	dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
	84	skb_headroom(skb));
	85	}
	86
	87	tx_info = MWIFIEX_SKB_TXCB(skb);
	88	tx_info->bss_num = priv->bss_num;
	89	tx_info->bss_type = priv->bss_type;
90	tx_info->flags \|= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
91
92	do_gettimeofday(&tv);
93	skb->tstamp = timeval_to_ktime(tv);
94	mwifiex_wmm_add_buf_txqueue(priv, skb);
95	atomic_inc(&adapter->tx_pending);
96	atomic_inc(&adapter->pending_bridged_pkts);
97
98	if ((atomic_read(&adapter->tx_pending) >= MAX_TX_PENDING)) {
99	mwifiex_set_trans_start(priv->netdev);
100	mwifiex_stop_net_dev_queue(priv->netdev, priv->adapter);
101	}
102	return;
103	}
104
105	/*
106	* This function contains logic for AP packet forwarding.
107	*
108	* If a packet is multicast/broadcast, it is sent to kernel/upper layer
109	* as well as queued back to AP TX queue so that it can be sent to other
110	* associated stations.
111	* If a packet is unicast and RA is present in associated station list,
112	* it is again requeued into AP TX queue.
113	* If a packet is unicast and RA is not in associated station list,
114	* packet is forwarded to kernel to handle routing logic.
115	*/
116	int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
117	struct sk_buff *skb)
118	{
119	struct mwifiex_adapter *adapter = priv->adapter;
120	struct uap_rxpd *uap_rx_pd;
121	struct rx_packet_hdr *rx_pkt_hdr;
122	u8 ra[ETH_ALEN];
123	struct sk_buff *skb_uap;
124
125	uap_rx_pd = (struct uap_rxpd *)(skb->data);
126	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
127
128	/* don't do packet forwarding in disconnected state */
129	if (!priv->media_connected) {
130	dev_err(adapter->dev, "drop packet in disconnected state.\n");
131	dev_kfree_skb_any(skb);
132	return 0;
133	}
134
135	memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
136
137	if (is_multicast_ether_addr(ra)) {
138	skb_uap = skb_copy(skb, GFP_ATOMIC);
139	mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
140	} else {
141	if (mwifiex_get_sta_entry(priv, ra)) {
142	/* Requeue Intra-BSS packet */
143	mwifiex_uap_queue_bridged_pkt(priv, skb);
144	return 0;
145	}
146	}
147
148	/* Forward unicat/Inter-BSS packets to kernel. */
149	return mwifiex_process_rx_packet(adapter, skb);
150	}
151
152	/*
153	* This function processes the packet received on AP interface.
154	*
155	* The function looks into the RxPD and performs sanity tests on the
156	* received buffer to ensure its a valid packet before processing it
157	* further. If the packet is determined to be aggregated, it is
158	* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
159	*
160	* The completion callback is called after processing is complete.
161	*/
162	int mwifiex_process_uap_rx_packet(struct mwifiex_adapter *adapter,
163	struct sk_buff *skb)
164	{
165	int ret;
166	struct uap_rxpd *uap_rx_pd;
167	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
168	struct rx_packet_hdr *rx_pkt_hdr;
169	u16 rx_pkt_type;
d1cf3b95 AP	170	u8 ta[ETH_ALEN], pkt_type;
	171	struct mwifiex_sta_node *node;
	172
838e4f44 AP	173	struct mwifiex_private *priv =
	174	mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
	175	rx_info->bss_type);
	176
	177	if (!priv)
	178	return -1;
	179
	180	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	181	rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
	182	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	183
	184	if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
	185	le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
	186	dev_err(adapter->dev,
	187	"wrong rx packet: len=%d, offset=%d, length=%d\n",
	188	skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
	189	le16_to_cpu(uap_rx_pd->rx_pkt_length));
	190	priv->stats.rx_dropped++;
	191
	192	if (adapter->if_ops.data_complete)
	193	adapter->if_ops.data_complete(adapter, skb);
	194	else
	195	dev_kfree_skb_any(skb);
	196
	197	return 0;
	198	}
838e4f44	199
d1cf3b95 AP	200	if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
	201	struct sk_buff_head list;
	202	struct sk_buff *rx_skb;
	203
	204	__skb_queue_head_init(&list);
	205	skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
	206	skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
	207
	208	ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
	209	priv->wdev->iftype, 0, false);
	210
	211	while (!skb_queue_empty(&list)) {
	212	rx_skb = __skb_dequeue(&list);
	213	ret = mwifiex_recv_packet(adapter, rx_skb);
	214	if (ret)
	215	dev_err(adapter->dev,
	216	"AP:Rx A-MSDU failed");
	217	}
	218
	219	return 0;
2dbaf751 SP	220	} else if (rx_pkt_type == PKT_TYPE_MGMT) {
	221	ret = mwifiex_process_mgmt_packet(adapter, skb);
	222	if (ret)
	223	dev_err(adapter->dev, "Rx of mgmt packet failed");
	224	dev_kfree_skb_any(skb);
	225	return ret;
d1cf3b95 AP	226	}
	227
	228	memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
	229
	230	if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
	231	node = mwifiex_get_sta_entry(priv, ta);
	232	if (node)
	233	node->rx_seq[uap_rx_pd->priority] =
	234	le16_to_cpu(uap_rx_pd->seq_num);
	235	}
	236
	237	if (!priv->ap_11n_enabled \|\|
	238	(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
	239	(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
	240	ret = mwifiex_handle_uap_rx_forward(priv, skb);
	241	return ret;
	242	}
	243
	244	/* Reorder and send to kernel */
	245	pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
	246	ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
	247	uap_rx_pd->priority, ta, pkt_type,
	248	skb);
	249
	250	if (ret \|\| (rx_pkt_type == PKT_TYPE_BAR)) {
838e4f44 AP	251	if (adapter->if_ops.data_complete)
	252	adapter->if_ops.data_complete(adapter, skb);
	253	else
	254	dev_kfree_skb_any(skb);
	255	}
	256
d1cf3b95 AP	257	if (ret)
	258	priv->stats.rx_dropped++;
	259
838e4f44 AP	260	return ret;
838e4f44 AP	261	}
4ac8764a AP	262
	263	/*
	264	* This function fills the TxPD for AP tx packets.
	265	*
	266	* The Tx buffer received by this function should already have the
	267	* header space allocated for TxPD.
	268	*
	269	* This function inserts the TxPD in between interface header and actual
	270	* data and adjusts the buffer pointers accordingly.
	271	*
	272	* The following TxPD fields are set by this function, as required -
	273	* - BSS number
	274	* - Tx packet length and offset
	275	* - Priority
	276	* - Packet delay
	277	* - Priority specific Tx control
	278	* - Flags
	279	*/
	280	void mwifiex_process_uap_txpd(struct mwifiex_private priv,
	281	struct sk_buff *skb)
	282	{
	283	struct mwifiex_adapter *adapter = priv->adapter;
	284	struct uap_txpd *txpd;
	285	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
	286	int pad, len;
	287
	288	if (!skb->len) {
	289	dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
	290	tx_info->status_code = -1;
	291	return skb->data;
	292	}
	293
	294	/* If skb->data is not aligned, add padding */
	295	pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
	296
	297	len = sizeof(*txpd) + pad;
	298
	299	BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
	300
	301	skb_push(skb, len);
	302
	303	txpd = (struct uap_txpd *)skb->data;
	304	memset(txpd, 0, sizeof(*txpd));
	305	txpd->bss_num = priv->bss_num;
	306	txpd->bss_type = priv->bss_type;
	307	txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
	308
	309	txpd->priority = (u8)skb->priority;
	310	txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
	311
	312	if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
	313	/*
	314	* Set the priority specific tx_control field, setting of 0 will
	315	* cause the default value to be used later in this function.
	316	*/
	317	txpd->tx_control =
	318	cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
	319
	320	/* Offset of actual data */
	321	txpd->tx_pkt_offset = cpu_to_le16(len);
	322
	323	/* make space for INTF_HEADER_LEN */
	324	skb_push(skb, INTF_HEADER_LEN);
	325
326	if (!txpd->tx_control)
327	/* TxCtrl set by user or default */
328	txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
329
330	return skb->data;
331	}