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

/*
 * Marvell Wireless LAN device driver: AP TX and RX data handling
 *
 * Copyright (C) 2012-2014, 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"

/* This function checks if particular RA list has packets more than low bridge
 * packet threshold and then deletes packet from this RA list.
 * Function deletes packets from such RA list and returns true. If no such list
 * is found, false is returned.
 */
static bool
mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
				  struct list_head *ra_list_head)
{
	struct mwifiex_ra_list_tbl *ra_list;
	struct sk_buff *skb, *tmp;
	bool pkt_deleted = false;
	struct mwifiex_txinfo *tx_info;
	struct mwifiex_adapter *adapter = priv->adapter;

	list_for_each_entry(ra_list, ra_list_head, list) {
		if (skb_queue_empty(&ra_list->skb_head))
			continue;

		skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
			tx_info = MWIFIEX_SKB_TXCB(skb);
			if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
				__skb_unlink(skb, &ra_list->skb_head);
				mwifiex_write_data_complete(adapter, skb, 0,
							    -1);
				atomic_dec(&priv->wmm.tx_pkts_queued);
				pkt_deleted = true;
			}
			if ((atomic_read(&adapter->pending_bridged_pkts) <=
					     MWIFIEX_BRIDGED_PKTS_THR_LOW))
				break;
		}
	}

	return pkt_deleted;
}

/* This function deletes packets from particular RA List. RA list index
 * from which packets are deleted is preserved so that packets from next RA
 * list are deleted upon subsequent call thus maintaining fairness.
 */
static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
{
	unsigned long flags;
	struct list_head *ra_list;
	int i;

	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);

	for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
		if (priv->del_list_idx == MAX_NUM_TID)
			priv->del_list_idx = 0;
		ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
		if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) {
			priv->del_list_idx++;
			break;
		}
	}

	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
}


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 ethhdr *p_ethhdr;

	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_THR_HIGH)) {
		dev_err(priv->adapter->dev,
			"Tx: Bridge packet limit reached. Drop packet!\n");
		kfree_skb(skb);
		mwifiex_uap_cleanup_tx_queues(priv);
		return;
	}

	if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
		     sizeof(bridge_tunnel_header))) ||
	    (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
		     sizeof(rfc1042_header)) &&
	     ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
	     ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
		/* Replace the 803 header and rfc1042 header (llc/snap) with
		 * an Ethernet II header, keep the src/dst and snap_type
		 * (ethertype).
		 *
		 * The firmware only passes up SNAP frames converting all RX
		 * data from 802.11 to 802.2/LLC/SNAP frames.
		 *
		 * To create the Ethernet II, just move the src, dst address
		 * right before the snap_type.
		 */
		p_ethhdr = (struct ethhdr *)
			((u8 *)(&rx_pkt_hdr->eth803_hdr)
			 + sizeof(rx_pkt_hdr->eth803_hdr)
			 + sizeof(rx_pkt_hdr->rfc1042_hdr)
			 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
			 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
			 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
		memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
		       sizeof(p_ethhdr->h_source));
		memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
		       sizeof(p_ethhdr->h_dest));
		/* Chop off the rxpd + the excess memory from
		 * 802.2/llc/snap header that was removed.
		 */
		hdr_chop = (u8 *)p_ethhdr - (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 that 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);
	memset(tx_info, 0, sizeof(*tx_info));
	tx_info->bss_num = priv->bss_num;
	tx_info->bss_type = priv->bss_type;
	tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;

	if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
		/* Update bridge packet statistics as the
		 * packet is not going to kernel/upper layer.
		 */
		priv->stats.rx_bytes += skb->len;
		priv->stats.rx_packets++;

		/* Sending bridge packet to TX queue, so save the packet
		 * length in TXCB to update statistics in TX complete.
		 */
		tx_info->pkt_len = skb->len;
	}

	__net_timestamp(skb);
	mwifiex_wmm_add_buf_txqueue(priv, skb);
	atomic_inc(&adapter->tx_pending);
	atomic_inc(&adapter->pending_bridged_pkts);

	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(priv, 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_private *priv,
				  struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	int ret;
	struct uap_rxpd *uap_rx_pd;
	struct rx_packet_hdr *rx_pkt_hdr;
	u16 rx_pkt_type;
	u8 ta[ETH_ALEN], pkt_type;
	struct mwifiex_sta_node *node;

	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++;
		dev_kfree_skb_any(skb);
		return 0;
	}

	if (rx_pkt_type == PKT_TYPE_MGMT) {
		ret = mwifiex_process_mgmt_packet(priv, 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))
		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;
	u16 pkt_type;

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

	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;

	/* 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 (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
	    tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
		txpd->tx_token_id = tx_info->ack_frame_id;
		txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
	}

	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 */
	if (pkt_type == PKT_TYPE_MGMT) {
		/* Set the packet type and add header for management frame */
		txpd->tx_pkt_type = cpu_to_le16(pkt_type);
		len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
	}

	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	*
65da33f5	4	* Copyright (C) 2012-2014, Marvell International Ltd.
838e4f44 AP	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	26
61c87304 AP	27	/* This function checks if particular RA list has packets more than low bridge
	28	* packet threshold and then deletes packet from this RA list.
	29	* Function deletes packets from such RA list and returns true. If no such list
	30	* is found, false is returned.
	31	*/
	32	static bool
	33	mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
	34	struct list_head *ra_list_head)
	35	{
	36	struct mwifiex_ra_list_tbl *ra_list;
	37	struct sk_buff skb, tmp;
	38	bool pkt_deleted = false;
	39	struct mwifiex_txinfo *tx_info;
	40	struct mwifiex_adapter *adapter = priv->adapter;
	41
	42	list_for_each_entry(ra_list, ra_list_head, list) {
	43	if (skb_queue_empty(&ra_list->skb_head))
	44	continue;
	45
	46	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
	47	tx_info = MWIFIEX_SKB_TXCB(skb);
	48	if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
	49	__skb_unlink(skb, &ra_list->skb_head);
	50	mwifiex_write_data_complete(adapter, skb, 0,
	51	-1);
	52	atomic_dec(&priv->wmm.tx_pkts_queued);
	53	pkt_deleted = true;
	54	}
	55	if ((atomic_read(&adapter->pending_bridged_pkts) <=
	56	MWIFIEX_BRIDGED_PKTS_THR_LOW))
	57	break;
	58	}
	59	}
	60
	61	return pkt_deleted;
	62	}
	63
	64	/* This function deletes packets from particular RA List. RA list index
	65	* from which packets are deleted is preserved so that packets from next RA
	66	* list are deleted upon subsequent call thus maintaining fairness.
	67	*/
	68	static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
	69	{
	70	unsigned long flags;
	71	struct list_head *ra_list;
	72	int i;
	73
	74	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
	75
	76	for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
	77	if (priv->del_list_idx == MAX_NUM_TID)
	78	priv->del_list_idx = 0;
	79	ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
	80	if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) {
	81	priv->del_list_idx++;
	82	break;
	83	}
	84	}
	85
	86	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
	87	}
	88
	89
838e4f44 AP	90	static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
	91	struct sk_buff *skb)
	92	{
	93	struct mwifiex_adapter *adapter = priv->adapter;
	94	struct uap_rxpd *uap_rx_pd;
	95	struct rx_packet_hdr *rx_pkt_hdr;
	96	struct sk_buff *new_skb;
	97	struct mwifiex_txinfo *tx_info;
	98	int hdr_chop;
8d93f1f3	99	struct ethhdr *p_ethhdr;
838e4f44 AP	100
	101	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	102	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	103
	104	if ((atomic_read(&adapter->pending_bridged_pkts) >=
61c87304	105	MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
838e4f44 AP	106	dev_err(priv->adapter->dev,
	107	"Tx: Bridge packet limit reached. Drop packet!\n");
	108	kfree_skb(skb);
61c87304	109	mwifiex_uap_cleanup_tx_queues(priv);
838e4f44 AP	110	return;
	111	}
	112
c613d16f AK	113	if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
	114	sizeof(bridge_tunnel_header))) \|\|
	115	(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
	116	sizeof(rfc1042_header)) &&
	117	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
	118	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
8d93f1f3 UR	119	/* Replace the 803 header and rfc1042 header (llc/snap) with
	120	* an Ethernet II header, keep the src/dst and snap_type
	121	* (ethertype).
	122	*
	123	* The firmware only passes up SNAP frames converting all RX
	124	* data from 802.11 to 802.2/LLC/SNAP frames.
	125	*
	126	* To create the Ethernet II, just move the src, dst address
	127	* right before the snap_type.
	128	*/
	129	p_ethhdr = (struct ethhdr *)
	130	((u8 *)(&rx_pkt_hdr->eth803_hdr)
	131	+ sizeof(rx_pkt_hdr->eth803_hdr)
	132	+ sizeof(rx_pkt_hdr->rfc1042_hdr)
	133	- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
	134	- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
	135	- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
	136	memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
	137	sizeof(p_ethhdr->h_source));
	138	memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
	139	sizeof(p_ethhdr->h_dest));
838e4f44 AP	140	/* Chop off the rxpd + the excess memory from
	141	* 802.2/llc/snap header that was removed.
	142	*/
8d93f1f3 UR	143	hdr_chop = (u8 )p_ethhdr - (u8 )uap_rx_pd;
8d93f1f3 UR	144	} else {
838e4f44 AP	145	/* Chop off the rxpd */
838e4f44 AP	146	hdr_chop = (u8 )&rx_pkt_hdr->eth803_hdr - (u8 )uap_rx_pd;
8d93f1f3	147	}
838e4f44	148
f7b59853	149	/* Chop off the leading header bytes so that it points
838e4f44 AP	150	* to the start of either the reconstructed EthII frame
	151	* or the 802.2/llc/snap frame.
	152	*/
	153	skb_pull(skb, hdr_chop);
	154
	155	if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
	156	dev_dbg(priv->adapter->dev,
	157	"data: Tx: insufficient skb headroom %d\n",
	158	skb_headroom(skb));
	159	/* Insufficient skb headroom - allocate a new skb */
	160	new_skb =
	161	skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
	162	if (unlikely(!new_skb)) {
	163	dev_err(priv->adapter->dev,
	164	"Tx: cannot allocate new_skb\n");
	165	kfree_skb(skb);
	166	priv->stats.tx_dropped++;
	167	return;
	168	}
	169
	170	kfree_skb(skb);
	171	skb = new_skb;
	172	dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
	173	skb_headroom(skb));
	174	}
	175
	176	tx_info = MWIFIEX_SKB_TXCB(skb);
701a9e61	177	memset(tx_info, 0, sizeof(*tx_info));
838e4f44 AP	178	tx_info->bss_num = priv->bss_num;
	179	tx_info->bss_type = priv->bss_type;
	180	tx_info->flags \|= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
	181
f7b59853 UR	182	if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
	183	/* Update bridge packet statistics as the
	184	* packet is not going to kernel/upper layer.
	185	*/
	186	priv->stats.rx_bytes += skb->len;
	187	priv->stats.rx_packets++;
	188
	189	/* Sending bridge packet to TX queue, so save the packet
	190	* length in TXCB to update statistics in TX complete.
	191	*/
	192	tx_info->pkt_len = skb->len;
	193	}
	194
c64800e7	195	__net_timestamp(skb);
838e4f44 AP	196	mwifiex_wmm_add_buf_txqueue(priv, skb);
	197	atomic_inc(&adapter->tx_pending);
	198	atomic_inc(&adapter->pending_bridged_pkts);
	199
838e4f44 AP	200	return;
	201	}
	202
	203	/*
	204	* This function contains logic for AP packet forwarding.
	205	*
	206	* If a packet is multicast/broadcast, it is sent to kernel/upper layer
	207	* as well as queued back to AP TX queue so that it can be sent to other
	208	* associated stations.
	209	* If a packet is unicast and RA is present in associated station list,
	210	* it is again requeued into AP TX queue.
	211	* If a packet is unicast and RA is not in associated station list,
	212	* packet is forwarded to kernel to handle routing logic.
	213	*/
	214	int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
	215	struct sk_buff *skb)
	216	{
	217	struct mwifiex_adapter *adapter = priv->adapter;
	218	struct uap_rxpd *uap_rx_pd;
	219	struct rx_packet_hdr *rx_pkt_hdr;
	220	u8 ra[ETH_ALEN];
	221	struct sk_buff *skb_uap;
	222
	223	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	224	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	225
	226	/* don't do packet forwarding in disconnected state */
	227	if (!priv->media_connected) {
	228	dev_err(adapter->dev, "drop packet in disconnected state.\n");
	229	dev_kfree_skb_any(skb);
	230	return 0;
	231	}
	232
	233	memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
	234
	235	if (is_multicast_ether_addr(ra)) {
	236	skb_uap = skb_copy(skb, GFP_ATOMIC);
	237	mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
	238	} else {
	239	if (mwifiex_get_sta_entry(priv, ra)) {
	240	/* Requeue Intra-BSS packet */
	241	mwifiex_uap_queue_bridged_pkt(priv, skb);
	242	return 0;
	243	}
	244	}
	245
	246	/* Forward unicat/Inter-BSS packets to kernel. */
f3b369e4	247	return mwifiex_process_rx_packet(priv, skb);
838e4f44 AP	248	}
	249
	250	/*
	251	* This function processes the packet received on AP interface.
	252	*
	253	* The function looks into the RxPD and performs sanity tests on the
	254	* received buffer to ensure its a valid packet before processing it
	255	* further. If the packet is determined to be aggregated, it is
	256	* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
	257	*
	258	* The completion callback is called after processing is complete.
	259	*/
f3b369e4	260	int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
838e4f44 AP	261	struct sk_buff *skb)
838e4f44 AP	262	{
f3b369e4	263	struct mwifiex_adapter *adapter = priv->adapter;
838e4f44 AP	264	int ret;
838e4f44 AP	265	struct uap_rxpd *uap_rx_pd;
838e4f44 AP	266	struct rx_packet_hdr *rx_pkt_hdr;
838e4f44 AP	267	u16 rx_pkt_type;
d1cf3b95 AP	268	u8 ta[ETH_ALEN], pkt_type;
	269	struct mwifiex_sta_node *node;
	270
838e4f44 AP	271	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	272	rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
	273	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	274
	275	if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
	276	le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
	277	dev_err(adapter->dev,
	278	"wrong rx packet: len=%d, offset=%d, length=%d\n",
	279	skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
	280	le16_to_cpu(uap_rx_pd->rx_pkt_length));
	281	priv->stats.rx_dropped++;
ca8d6dfc	282	dev_kfree_skb_any(skb);
838e4f44 AP	283	return 0;
838e4f44 AP	284	}
838e4f44	285
4c9f9fb2	286	if (rx_pkt_type == PKT_TYPE_MGMT) {
f3b369e4	287	ret = mwifiex_process_mgmt_packet(priv, skb);
2dbaf751 SP	288	if (ret)
	289	dev_err(adapter->dev, "Rx of mgmt packet failed");
	290	dev_kfree_skb_any(skb);
	291	return ret;
d1cf3b95 AP	292	}
	293
	294	memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
	295
	296	if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
	297	node = mwifiex_get_sta_entry(priv, ta);
	298	if (node)
	299	node->rx_seq[uap_rx_pd->priority] =
	300	le16_to_cpu(uap_rx_pd->seq_num);
	301	}
	302
	303	if (!priv->ap_11n_enabled \|\|
	304	(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
	305	(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
	306	ret = mwifiex_handle_uap_rx_forward(priv, skb);
	307	return ret;
	308	}
	309
	310	/* Reorder and send to kernel */
	311	pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
	312	ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
	313	uap_rx_pd->priority, ta, pkt_type,
	314	skb);
	315
ca8d6dfc UR	316	if (ret \|\| (rx_pkt_type == PKT_TYPE_BAR))
ca8d6dfc UR	317	dev_kfree_skb_any(skb);
838e4f44	318
d1cf3b95 AP	319	if (ret)
	320	priv->stats.rx_dropped++;
	321
838e4f44 AP	322	return ret;
838e4f44 AP	323	}
4ac8764a AP	324
	325	/*
	326	* This function fills the TxPD for AP tx packets.
	327	*
	328	* The Tx buffer received by this function should already have the
	329	* header space allocated for TxPD.
	330	*
	331	* This function inserts the TxPD in between interface header and actual
	332	* data and adjusts the buffer pointers accordingly.
	333	*
	334	* The following TxPD fields are set by this function, as required -
	335	* - BSS number
	336	* - Tx packet length and offset
	337	* - Priority
	338	* - Packet delay
	339	* - Priority specific Tx control
	340	* - Flags
	341	*/
	342	void mwifiex_process_uap_txpd(struct mwifiex_private priv,
	343	struct sk_buff *skb)
	344	{
	345	struct mwifiex_adapter *adapter = priv->adapter;
	346	struct uap_txpd *txpd;
	347	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
	348	int pad, len;
3215215a	349	u16 pkt_type;
4ac8764a AP	350
	351	if (!skb->len) {
	352	dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
	353	tx_info->status_code = -1;
	354	return skb->data;
	355	}
	356
3215215a SP	357	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
3215215a SP	358
4ac8764a AP	359	/* If skb->data is not aligned, add padding */
	360	pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
	361
	362	len = sizeof(*txpd) + pad;
	363
	364	BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
	365
	366	skb_push(skb, len);
	367
	368	txpd = (struct uap_txpd *)skb->data;
	369	memset(txpd, 0, sizeof(*txpd));
	370	txpd->bss_num = priv->bss_num;
	371	txpd->bss_type = priv->bss_type;
	372	txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
4ac8764a	373	txpd->priority = (u8)skb->priority;
808bbebc	374
4ac8764a AP	375	txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
4ac8764a AP	376
18ca4382 AK	377	if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS \|\|
18ca4382 AK	378	tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
808bbebc AK	379	txpd->tx_token_id = tx_info->ack_frame_id;
	380	txpd->flags \|= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
	381	}
	382
4ac8764a AP	383	if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
	384	/*
	385	* Set the priority specific tx_control field, setting of 0 will
	386	* cause the default value to be used later in this function.
	387	*/
	388	txpd->tx_control =
	389	cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
	390
	391	/* Offset of actual data */
3215215a SP	392	if (pkt_type == PKT_TYPE_MGMT) {
	393	/* Set the packet type and add header for management frame */
	394	txpd->tx_pkt_type = cpu_to_le16(pkt_type);
	395	len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
	396	}
	397
4ac8764a AP	398	txpd->tx_pkt_offset = cpu_to_le16(len);
	399
	400	/* make space for INTF_HEADER_LEN */
	401	skb_push(skb, INTF_HEADER_LEN);
	402
	403	if (!txpd->tx_control)
	404	/* TxCtrl set by user or default */
	405	txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
	406
	407	return skb->data;
	408	}