[linux-2.6-block.git] / drivers / net / wireless / marvell / mwifiex / uap_txrx.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * NXP Wireless LAN device driver: AP TX and RX data handling
 *
 * Copyright 2011-2020 NXP
 */

#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,
				  int tid)
{
	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);
				if (ra_list->tx_paused)
					priv->wmm.pkts_paused[tid]--;
				else
					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)
{
	struct list_head *ra_list;
	int i;

	spin_lock_bh(&priv->wmm.ra_list_spinlock);

	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, i)) {
			priv->del_list_idx++;
			break;
		}
	}

	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
}


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;
	struct mwifiex_sta_node *src_node;
	int index;

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

	if (sizeof(*rx_pkt_hdr) +
	    le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {
		mwifiex_dbg(adapter, ERROR,
			    "wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",
			    skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
		priv->stats.rx_dropped++;
		dev_kfree_skb_any(skb);
		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) {
		mwifiex_dbg(priv->adapter, ERROR,
			    "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)) {
			mwifiex_dbg(priv->adapter, ERROR,
				    "Tx: cannot allocate new_skb\n");
			kfree_skb(skb);
			priv->stats.tx_dropped++;
			return;
		}

		kfree_skb(skb);
		skb = new_skb;
		mwifiex_dbg(priv->adapter, INFO,
			    "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;

	src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);
	if (src_node) {
		src_node->stats.last_rx = jiffies;
		src_node->stats.rx_bytes += skb->len;
		src_node->stats.rx_packets++;
		src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;
		src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;
	}

	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);

	index = mwifiex_1d_to_wmm_queue[skb->priority];
	atomic_inc(&priv->wmm_tx_pending[index]);
	mwifiex_wmm_add_buf_txqueue(priv, skb);
	atomic_inc(&adapter->tx_pending);
	atomic_inc(&adapter->pending_bridged_pkts);

	mwifiex_queue_main_work(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) {
		mwifiex_dbg(adapter, ERROR,
			    "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);
		if (likely(skb_uap)) {
			mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
		} else {
			mwifiex_dbg(adapter, ERROR,
				    "failed to copy skb for uAP\n");
			priv->stats.rx_dropped++;
			dev_kfree_skb_any(skb);
			return -1;
		}
	} 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);
}

int mwifiex_uap_recv_packet(struct mwifiex_private *priv,
			    struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_sta_node *src_node;
	struct ethhdr *p_ethhdr;
	struct sk_buff *skb_uap;
	struct mwifiex_txinfo *tx_info;

	if (!skb)
		return -1;

	p_ethhdr = (void *)skb->data;
	src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
	if (src_node) {
		src_node->stats.last_rx = jiffies;
		src_node->stats.rx_bytes += skb->len;
		src_node->stats.rx_packets++;
	}

	if (is_multicast_ether_addr(p_ethhdr->h_dest) ||
	    mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) {
		if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN)
			skb_uap =
			skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
		else
			skb_uap = skb_copy(skb, GFP_ATOMIC);

		if (likely(skb_uap)) {
			tx_info = MWIFIEX_SKB_TXCB(skb_uap);
			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;
			__net_timestamp(skb_uap);
			mwifiex_wmm_add_buf_txqueue(priv, skb_uap);
			atomic_inc(&adapter->tx_pending);
			atomic_inc(&adapter->pending_bridged_pkts);
			if ((atomic_read(&adapter->pending_bridged_pkts) >=
					MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
				mwifiex_dbg(adapter, ERROR,
					    "Tx: Bridge packet limit reached. Drop packet!\n");
				mwifiex_uap_cleanup_tx_queues(priv);
			}

		} else {
			mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap");
		}

		mwifiex_queue_main_work(adapter);
		/* Don't forward Intra-BSS unicast packet to upper layer*/
		if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest))
			return 0;
	}

	skb->dev = priv->netdev;
	skb->protocol = eth_type_trans(skb, priv->netdev);
	skb->ip_summed = CHECKSUM_NONE;

	/* This is required only in case of 11n and USB/PCIE as we alloc
	 * a buffer of 4K only if its 11N (to be able to receive 4K
	 * AMSDU packets). In case of SD we allocate buffers based
	 * on the size of packet and hence this is not needed.
	 *
	 * Modifying the truesize here as our allocation for each
	 * skb is 4K but we only receive 2K packets and this cause
	 * the kernel to start dropping packets in case where
	 * application has allocated buffer based on 2K size i.e.
	 * if there a 64K packet received (in IP fragments and
	 * application allocates 64K to receive this packet but
	 * this packet would almost double up because we allocate
	 * each 1.5K fragment in 4K and pass it up. As soon as the
	 * 64K limit hits kernel will start to drop rest of the
	 * fragments. Currently we fail the Filesndl-ht.scr script
	 * for UDP, hence this fix
	 */
	if ((adapter->iface_type == MWIFIEX_USB ||
	     adapter->iface_type == MWIFIEX_PCIE) &&
	    skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE)
		skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);

	/* Forward multicast/broadcast packet to upper layer*/
	netif_rx(skb);
	return 0;
}

/*
 * 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) +
	    sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {
		mwifiex_dbg(adapter, ERROR,
			    "wrong rx packet for struct ethhdr: len=%d, offset=%d\n",
			    skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
		priv->stats.rx_dropped++;
		dev_kfree_skb_any(skb);
		return 0;
	}

	ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);

	if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
	     le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
		mwifiex_dbg(adapter, ERROR,
			    "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++;

		node = mwifiex_get_sta_entry(priv, ta);
		if (node)
			node->stats.tx_failed++;

		dev_kfree_skb_any(skb);
		return 0;
	}

	if (rx_pkt_type == PKT_TYPE_MGMT) {
		ret = mwifiex_process_mgmt_packet(priv, skb);
		if (ret)
			mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
		dev_kfree_skb_any(skb);
		return ret;
	}


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

	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;
	u16 pkt_type, pkt_offset;
	int hroom = adapter->intf_hdr_len;

	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;

	pad = ((uintptr_t)skb->data - (sizeof(*txpd) + hroom)) &
	       (MWIFIEX_DMA_ALIGN_SZ - 1);

	skb_push(skb, sizeof(*txpd) + pad);

	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 - (sizeof(*txpd) +
						pad)));
	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 */
	pkt_offset = sizeof(*txpd) + pad;
	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);
		pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
	}

	txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);

	/* make space for adapter->intf_hdr_len */
	skb_push(skb, hroom);

	if (!txpd->tx_control)
		/* TxCtrl set by user or default */
		txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
}
Commit	Line	Data
828c91f7	1	// SPDX-License-Identifier: GPL-2.0-only
838e4f44	2	/*
932183aa	3	* NXP Wireless LAN device driver: AP TX and RX data handling
838e4f44	4	*
932183aa	5	* Copyright 2011-2020 NXP
838e4f44 AP	6	*/
	7
	8	#include "decl.h"
	9	#include "ioctl.h"
	10	#include "main.h"
	11	#include "wmm.h"
d1cf3b95 AP	12	#include "11n_aggr.h"
d1cf3b95 AP	13	#include "11n_rxreorder.h"
838e4f44	14
61c87304 AP	15	/* This function checks if particular RA list has packets more than low bridge
	16	* packet threshold and then deletes packet from this RA list.
	17	* Function deletes packets from such RA list and returns true. If no such list
	18	* is found, false is returned.
	19	*/
	20	static bool
	21	mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
70c5ad7e ZL	22	struct list_head *ra_list_head,
70c5ad7e ZL	23	int tid)
61c87304 AP	24	{
	25	struct mwifiex_ra_list_tbl *ra_list;
	26	struct sk_buff skb, tmp;
	27	bool pkt_deleted = false;
	28	struct mwifiex_txinfo *tx_info;
	29	struct mwifiex_adapter *adapter = priv->adapter;
	30
	31	list_for_each_entry(ra_list, ra_list_head, list) {
	32	if (skb_queue_empty(&ra_list->skb_head))
	33	continue;
	34
	35	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
	36	tx_info = MWIFIEX_SKB_TXCB(skb);
	37	if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
	38	__skb_unlink(skb, &ra_list->skb_head);
	39	mwifiex_write_data_complete(adapter, skb, 0,
	40	-1);
70c5ad7e ZL	41	if (ra_list->tx_paused)
	42	priv->wmm.pkts_paused[tid]--;
	43	else
	44	atomic_dec(&priv->wmm.tx_pkts_queued);
61c87304 AP	45	pkt_deleted = true;
	46	}
	47	if ((atomic_read(&adapter->pending_bridged_pkts) <=
	48	MWIFIEX_BRIDGED_PKTS_THR_LOW))
	49	break;
	50	}
	51	}
	52
	53	return pkt_deleted;
	54	}
	55
	56	/* This function deletes packets from particular RA List. RA list index
	57	* from which packets are deleted is preserved so that packets from next RA
	58	* list are deleted upon subsequent call thus maintaining fairness.
	59	*/
	60	static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
	61	{
61c87304 AP	62	struct list_head *ra_list;
	63	int i;
	64
8a7f9fd8	65	spin_lock_bh(&priv->wmm.ra_list_spinlock);
61c87304 AP	66
	67	for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
	68	if (priv->del_list_idx == MAX_NUM_TID)
	69	priv->del_list_idx = 0;
	70	ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
70c5ad7e	71	if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) {
61c87304 AP	72	priv->del_list_idx++;
	73	break;
	74	}
	75	}
	76
8a7f9fd8	77	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
61c87304 AP	78	}
	79
	80
838e4f44 AP	81	static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
	82	struct sk_buff *skb)
	83	{
	84	struct mwifiex_adapter *adapter = priv->adapter;
	85	struct uap_rxpd *uap_rx_pd;
	86	struct rx_packet_hdr *rx_pkt_hdr;
	87	struct sk_buff *new_skb;
	88	struct mwifiex_txinfo *tx_info;
	89	int hdr_chop;
8d93f1f3	90	struct ethhdr *p_ethhdr;
442f6f9b	91	struct mwifiex_sta_node *src_node;
bb28c28e	92	int index;
838e4f44 AP	93
	94	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	95	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	96
	97	if ((atomic_read(&adapter->pending_bridged_pkts) >=
61c87304	98	MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
acebe8c1 ZL	99	mwifiex_dbg(priv->adapter, ERROR,
acebe8c1 ZL	100	"Tx: Bridge packet limit reached. Drop packet!\n");
838e4f44	101	kfree_skb(skb);
61c87304	102	mwifiex_uap_cleanup_tx_queues(priv);
838e4f44 AP	103	return;
	104	}
	105
11958528 PP	106	if (sizeof(*rx_pkt_hdr) +
	107	le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {
	108	mwifiex_dbg(adapter, ERROR,
	109	"wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",
	110	skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
	111	priv->stats.rx_dropped++;
	112	dev_kfree_skb_any(skb);
2785851c	113	return;
11958528 PP	114	}
11958528 PP	115
c613d16f AK	116	if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
	117	sizeof(bridge_tunnel_header))) \|\|
	118	(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
	119	sizeof(rfc1042_header)) &&
	120	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
	121	ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
8d93f1f3 UR	122	/* Replace the 803 header and rfc1042 header (llc/snap) with
	123	* an Ethernet II header, keep the src/dst and snap_type
	124	* (ethertype).
	125	*
	126	* The firmware only passes up SNAP frames converting all RX
	127	* data from 802.11 to 802.2/LLC/SNAP frames.
	128	*
	129	* To create the Ethernet II, just move the src, dst address
	130	* right before the snap_type.
	131	*/
	132	p_ethhdr = (struct ethhdr *)
	133	((u8 *)(&rx_pkt_hdr->eth803_hdr)
	134	+ sizeof(rx_pkt_hdr->eth803_hdr)
	135	+ sizeof(rx_pkt_hdr->rfc1042_hdr)
	136	- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
	137	- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
	138	- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
	139	memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
	140	sizeof(p_ethhdr->h_source));
	141	memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
	142	sizeof(p_ethhdr->h_dest));
838e4f44 AP	143	/* Chop off the rxpd + the excess memory from
	144	* 802.2/llc/snap header that was removed.
	145	*/
8d93f1f3 UR	146	hdr_chop = (u8 )p_ethhdr - (u8 )uap_rx_pd;
8d93f1f3 UR	147	} else {
838e4f44 AP	148	/* Chop off the rxpd */
838e4f44 AP	149	hdr_chop = (u8 )&rx_pkt_hdr->eth803_hdr - (u8 )uap_rx_pd;
8d93f1f3	150	}
838e4f44	151
f7b59853	152	/* Chop off the leading header bytes so that it points
838e4f44 AP	153	* to the start of either the reconstructed EthII frame
	154	* or the 802.2/llc/snap frame.
	155	*/
	156	skb_pull(skb, hdr_chop);
	157
	158	if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
acebe8c1 ZL	159	mwifiex_dbg(priv->adapter, ERROR,
	160	"data: Tx: insufficient skb headroom %d\n",
	161	skb_headroom(skb));
838e4f44 AP	162	/* Insufficient skb headroom - allocate a new skb */
	163	new_skb =
	164	skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
	165	if (unlikely(!new_skb)) {
acebe8c1 ZL	166	mwifiex_dbg(priv->adapter, ERROR,
acebe8c1 ZL	167	"Tx: cannot allocate new_skb\n");
838e4f44 AP	168	kfree_skb(skb);
	169	priv->stats.tx_dropped++;
	170	return;
	171	}
	172
	173	kfree_skb(skb);
	174	skb = new_skb;
acebe8c1 ZL	175	mwifiex_dbg(priv->adapter, INFO,
	176	"info: new skb headroom %d\n",
	177	skb_headroom(skb));
838e4f44 AP	178	}
	179
	180	tx_info = MWIFIEX_SKB_TXCB(skb);
701a9e61	181	memset(tx_info, 0, sizeof(*tx_info));
838e4f44 AP	182	tx_info->bss_num = priv->bss_num;
	183	tx_info->bss_type = priv->bss_type;
	184	tx_info->flags \|= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
	185
442f6f9b XH	186	src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);
	187	if (src_node) {
	188	src_node->stats.last_rx = jiffies;
	189	src_node->stats.rx_bytes += skb->len;
	190	src_node->stats.rx_packets++;
	191	src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;
	192	src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;
	193	}
	194
f7b59853 UR	195	if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
	196	/* Update bridge packet statistics as the
	197	* packet is not going to kernel/upper layer.
	198	*/
	199	priv->stats.rx_bytes += skb->len;
	200	priv->stats.rx_packets++;
	201
	202	/* Sending bridge packet to TX queue, so save the packet
	203	* length in TXCB to update statistics in TX complete.
	204	*/
	205	tx_info->pkt_len = skb->len;
	206	}
	207
c64800e7	208	__net_timestamp(skb);
bb28c28e MF	209
	210	index = mwifiex_1d_to_wmm_queue[skb->priority];
	211	atomic_inc(&priv->wmm_tx_pending[index]);
838e4f44 AP	212	mwifiex_wmm_add_buf_txqueue(priv, skb);
	213	atomic_inc(&adapter->tx_pending);
	214	atomic_inc(&adapter->pending_bridged_pkts);
	215
ad5ca845 XH	216	mwifiex_queue_main_work(priv->adapter);
ad5ca845 XH	217
838e4f44 AP	218	return;
	219	}
	220
	221	/*
	222	* This function contains logic for AP packet forwarding.
	223	*
	224	* If a packet is multicast/broadcast, it is sent to kernel/upper layer
	225	* as well as queued back to AP TX queue so that it can be sent to other
	226	* associated stations.
	227	* If a packet is unicast and RA is present in associated station list,
	228	* it is again requeued into AP TX queue.
	229	* If a packet is unicast and RA is not in associated station list,
	230	* packet is forwarded to kernel to handle routing logic.
	231	*/
	232	int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
	233	struct sk_buff *skb)
	234	{
	235	struct mwifiex_adapter *adapter = priv->adapter;
	236	struct uap_rxpd *uap_rx_pd;
	237	struct rx_packet_hdr *rx_pkt_hdr;
	238	u8 ra[ETH_ALEN];
	239	struct sk_buff *skb_uap;
	240
	241	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	242	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	243
	244	/* don't do packet forwarding in disconnected state */
	245	if (!priv->media_connected) {
acebe8c1 ZL	246	mwifiex_dbg(adapter, ERROR,
acebe8c1 ZL	247	"drop packet in disconnected state.\n");
838e4f44 AP	248	dev_kfree_skb_any(skb);
	249	return 0;
	250	}
	251
	252	memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
	253
	254	if (is_multicast_ether_addr(ra)) {
	255	skb_uap = skb_copy(skb, GFP_ATOMIC);
35a7a1ce DA	256	if (likely(skb_uap)) {
	257	mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
	258	} else {
	259	mwifiex_dbg(adapter, ERROR,
	260	"failed to copy skb for uAP\n");
	261	priv->stats.rx_dropped++;
	262	dev_kfree_skb_any(skb);
	263	return -1;
	264	}
838e4f44 AP	265	} else {
	266	if (mwifiex_get_sta_entry(priv, ra)) {
	267	/* Requeue Intra-BSS packet */
	268	mwifiex_uap_queue_bridged_pkt(priv, skb);
	269	return 0;
	270	}
	271	}
	272
	273	/* Forward unicat/Inter-BSS packets to kernel. */
f3b369e4	274	return mwifiex_process_rx_packet(priv, skb);
838e4f44 AP	275	}
838e4f44 AP	276
bf00dc22 XH	277	int mwifiex_uap_recv_packet(struct mwifiex_private *priv,
	278	struct sk_buff *skb)
	279	{
3fdbda44	280	struct mwifiex_adapter *adapter = priv->adapter;
bf00dc22 XH	281	struct mwifiex_sta_node *src_node;
	282	struct ethhdr *p_ethhdr;
	283	struct sk_buff *skb_uap;
	284	struct mwifiex_txinfo *tx_info;
	285
	286	if (!skb)
	287	return -1;
	288
	289	p_ethhdr = (void *)skb->data;
	290	src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
	291	if (src_node) {
	292	src_node->stats.last_rx = jiffies;
	293	src_node->stats.rx_bytes += skb->len;
	294	src_node->stats.rx_packets++;
	295	}
	296
bf00dc22 XH	297	if (is_multicast_ether_addr(p_ethhdr->h_dest) \|\|
	298	mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) {
	299	if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN)
	300	skb_uap =
	301	skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
	302	else
	303	skb_uap = skb_copy(skb, GFP_ATOMIC);
	304
	305	if (likely(skb_uap)) {
	306	tx_info = MWIFIEX_SKB_TXCB(skb_uap);
	307	memset(tx_info, 0, sizeof(*tx_info));
	308	tx_info->bss_num = priv->bss_num;
	309	tx_info->bss_type = priv->bss_type;
	310	tx_info->flags \|= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
	311	__net_timestamp(skb_uap);
	312	mwifiex_wmm_add_buf_txqueue(priv, skb_uap);
	313	atomic_inc(&adapter->tx_pending);
	314	atomic_inc(&adapter->pending_bridged_pkts);
	315	if ((atomic_read(&adapter->pending_bridged_pkts) >=
	316	MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
	317	mwifiex_dbg(adapter, ERROR,
	318	"Tx: Bridge packet limit reached. Drop packet!\n");
	319	mwifiex_uap_cleanup_tx_queues(priv);
	320	}
	321
	322	} else {
	323	mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap");
	324	}
	325
	326	mwifiex_queue_main_work(adapter);
	327	/* Don't forward Intra-BSS unicast packet to upper layer*/
	328	if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest))
	329	return 0;
	330	}
	331
38013eef XH	332	skb->dev = priv->netdev;
	333	skb->protocol = eth_type_trans(skb, priv->netdev);
	334	skb->ip_summed = CHECKSUM_NONE;
	335
	336	/* This is required only in case of 11n and USB/PCIE as we alloc
	337	* a buffer of 4K only if its 11N (to be able to receive 4K
	338	* AMSDU packets). In case of SD we allocate buffers based
	339	* on the size of packet and hence this is not needed.
	340	*
	341	* Modifying the truesize here as our allocation for each
	342	* skb is 4K but we only receive 2K packets and this cause
	343	* the kernel to start dropping packets in case where
	344	* application has allocated buffer based on 2K size i.e.
	345	* if there a 64K packet received (in IP fragments and
	346	* application allocates 64K to receive this packet but
	347	* this packet would almost double up because we allocate
	348	* each 1.5K fragment in 4K and pass it up. As soon as the
	349	* 64K limit hits kernel will start to drop rest of the
	350	* fragments. Currently we fail the Filesndl-ht.scr script
	351	* for UDP, hence this fix
	352	*/
	353	if ((adapter->iface_type == MWIFIEX_USB \|\|
	354	adapter->iface_type == MWIFIEX_PCIE) &&
	355	skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE)
	356	skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
	357
bf00dc22	358	/* Forward multicast/broadcast packet to upper layer*/
afb6d39f	359	netif_rx(skb);
bf00dc22 XH	360	return 0;
	361	}
	362
838e4f44 AP	363	/*
	364	* This function processes the packet received on AP interface.
	365	*
	366	* The function looks into the RxPD and performs sanity tests on the
	367	* received buffer to ensure its a valid packet before processing it
	368	* further. If the packet is determined to be aggregated, it is
	369	* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
	370	*
	371	* The completion callback is called after processing is complete.
	372	*/
f3b369e4	373	int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
838e4f44 AP	374	struct sk_buff *skb)
838e4f44 AP	375	{
f3b369e4	376	struct mwifiex_adapter *adapter = priv->adapter;
838e4f44 AP	377	int ret;
838e4f44 AP	378	struct uap_rxpd *uap_rx_pd;
838e4f44 AP	379	struct rx_packet_hdr *rx_pkt_hdr;
838e4f44 AP	380	u16 rx_pkt_type;
d1cf3b95 AP	381	u8 ta[ETH_ALEN], pkt_type;
	382	struct mwifiex_sta_node *node;
	383
838e4f44 AP	384	uap_rx_pd = (struct uap_rxpd *)(skb->data);
	385	rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
	386	rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
	387
11958528 PP	388	if (le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
	389	sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {
	390	mwifiex_dbg(adapter, ERROR,
	391	"wrong rx packet for struct ethhdr: len=%d, offset=%d\n",
	392	skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
	393	priv->stats.rx_dropped++;
	394	dev_kfree_skb_any(skb);
	395	return 0;
	396	}
	397
442f6f9b XH	398	ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
442f6f9b XH	399
838e4f44 AP	400	if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
838e4f44 AP	401	le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
acebe8c1 ZL	402	mwifiex_dbg(adapter, ERROR,
	403	"wrong rx packet: len=%d, offset=%d, length=%d\n",
	404	skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
	405	le16_to_cpu(uap_rx_pd->rx_pkt_length));
838e4f44	406	priv->stats.rx_dropped++;
442f6f9b XH	407
	408	node = mwifiex_get_sta_entry(priv, ta);
	409	if (node)
	410	node->stats.tx_failed++;
	411
ca8d6dfc	412	dev_kfree_skb_any(skb);
838e4f44 AP	413	return 0;
838e4f44 AP	414	}
838e4f44	415
4c9f9fb2	416	if (rx_pkt_type == PKT_TYPE_MGMT) {
f3b369e4	417	ret = mwifiex_process_mgmt_packet(priv, skb);
2dbaf751	418	if (ret)
bd642acf	419	mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
2dbaf751 SP	420	dev_kfree_skb_any(skb);
2dbaf751 SP	421	return ret;
d1cf3b95 AP	422	}
d1cf3b95 AP	423
d1cf3b95 AP	424
d1cf3b95 AP	425	if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
8a7f9fd8	426	spin_lock_bh(&priv->sta_list_spinlock);
d1cf3b95 AP	427	node = mwifiex_get_sta_entry(priv, ta);
	428	if (node)
	429	node->rx_seq[uap_rx_pd->priority] =
	430	le16_to_cpu(uap_rx_pd->seq_num);
8a7f9fd8	431	spin_unlock_bh(&priv->sta_list_spinlock);
d1cf3b95 AP	432	}
	433
	434	if (!priv->ap_11n_enabled \|\|
	435	(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
	436	(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
	437	ret = mwifiex_handle_uap_rx_forward(priv, skb);
	438	return ret;
	439	}
	440
	441	/* Reorder and send to kernel */
	442	pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
	443	ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
	444	uap_rx_pd->priority, ta, pkt_type,
	445	skb);
	446
ca8d6dfc UR	447	if (ret \|\| (rx_pkt_type == PKT_TYPE_BAR))
ca8d6dfc UR	448	dev_kfree_skb_any(skb);
838e4f44	449
d1cf3b95 AP	450	if (ret)
	451	priv->stats.rx_dropped++;
	452
838e4f44 AP	453	return ret;
838e4f44 AP	454	}
4ac8764a AP	455
	456	/*
	457	* This function fills the TxPD for AP tx packets.
	458	*
	459	* The Tx buffer received by this function should already have the
	460	* header space allocated for TxPD.
	461	*
	462	* This function inserts the TxPD in between interface header and actual
	463	* data and adjusts the buffer pointers accordingly.
	464	*
	465	* The following TxPD fields are set by this function, as required -
	466	* - BSS number
	467	* - Tx packet length and offset
	468	* - Priority
	469	* - Packet delay
	470	* - Priority specific Tx control
	471	* - Flags
	472	*/
35983875 DA	473	void mwifiex_process_uap_txpd(struct mwifiex_private *priv,
35983875 DA	474	struct sk_buff *skb)
4ac8764a AP	475	{
	476	struct mwifiex_adapter *adapter = priv->adapter;
	477	struct uap_txpd *txpd;
	478	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
84b313b3 XH	479	int pad;
84b313b3 XH	480	u16 pkt_type, pkt_offset;
f4c5d599	481	int hroom = adapter->intf_hdr_len;
4ac8764a	482
84b313b3	483	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
4ac8764a	484
603a1621 AB	485	pad = ((uintptr_t)skb->data - (sizeof(*txpd) + hroom)) &
603a1621 AB	486	(MWIFIEX_DMA_ALIGN_SZ - 1);
4ac8764a	487
84b313b3	488	skb_push(skb, sizeof(*txpd) + pad);
4ac8764a AP	489
	490	txpd = (struct uap_txpd *)skb->data;
	491	memset(txpd, 0, sizeof(*txpd));
	492	txpd->bss_num = priv->bss_num;
	493	txpd->bss_type = priv->bss_type;
84b313b3 XH	494	txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +
84b313b3 XH	495	pad)));
4ac8764a	496	txpd->priority = (u8)skb->priority;
808bbebc	497
4ac8764a AP	498	txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
4ac8764a AP	499
18ca4382 AK	500	if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS \|\|
18ca4382 AK	501	tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
808bbebc AK	502	txpd->tx_token_id = tx_info->ack_frame_id;
	503	txpd->flags \|= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
	504	}
	505
4ac8764a AP	506	if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
	507	/*
	508	* Set the priority specific tx_control field, setting of 0 will
	509	* cause the default value to be used later in this function.
	510	*/
	511	txpd->tx_control =
	512	cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
	513
	514	/* Offset of actual data */
84b313b3	515	pkt_offset = sizeof(*txpd) + pad;
3215215a SP	516	if (pkt_type == PKT_TYPE_MGMT) {
	517	/* Set the packet type and add header for management frame */
	518	txpd->tx_pkt_type = cpu_to_le16(pkt_type);
84b313b3	519	pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
3215215a SP	520	}
3215215a SP	521
84b313b3	522	txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);
4ac8764a	523
f4c5d599	524	/* make space for adapter->intf_hdr_len */
84b313b3	525	skb_push(skb, hroom);
4ac8764a AP	526
	527	if (!txpd->tx_control)
	528	/* TxCtrl set by user or default */
	529	txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
4ac8764a	530	}