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

/*
 * Marvell Wireless LAN device driver: station RX data handling
 *
 * Copyright (C) 2011, 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 "util.h"
#include "fw.h"
#include "main.h"
#include "11n_aggr.h"
#include "11n_rxreorder.h"

/*
 * This function processes the received packet and forwards it
 * to kernel/upper layer.
 *
 * This function parses through the received packet and determines
 * if it is a debug packet or normal packet.
 *
 * For non-debug packets, the function chops off unnecessary leading
 * header bytes, reconstructs the packet as an ethernet frame or
 * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
 *
 * The completion callback is called after processing in complete.
 */
int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
			      struct sk_buff *skb)
{
	int ret;
	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
	struct mwifiex_private *priv =
			mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
					       rx_info->bss_type);
	struct rx_packet_hdr *rx_pkt_hdr;
	struct rxpd *local_rx_pd;
	int hdr_chop;
	struct ethhdr *eth_hdr;
	u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

	local_rx_pd = (struct rxpd *) (skb->data);

	rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
				local_rx_pd->rx_pkt_offset);

	if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
		    rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
		/*
		 *  Replace the 803 header and rfc1042 header (llc/snap) with an
		 *    EthernetII 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.
		 */
		eth_hdr = (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(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
		       sizeof(eth_hdr->h_source));
		memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
		       sizeof(eth_hdr->h_dest));

		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
		   header that was removed. */
		hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
	} else {
		/* Chop off the rxpd */
		hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
			(u8 *) local_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);

	priv->rxpd_rate = local_rx_pd->rx_rate;

	priv->rxpd_htinfo = local_rx_pd->ht_info;

	ret = mwifiex_recv_packet(adapter, skb);
	if (ret == -1)
		dev_err(adapter->dev, "recv packet failed\n");

	return ret;
}

/*
 * This function processes the received buffer.
 *
 * 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. Non-unicast packets are sent directly to
 * the kernel/upper layers. Unicast packets are handed over to the
 * Rx reordering routine if 11n is enabled.
 *
 * The completion callback is called after processing in complete.
 */
int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
				  struct sk_buff *skb)
{
	int ret = 0;
	struct rxpd *local_rx_pd;
	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
	struct rx_packet_hdr *rx_pkt_hdr;
	u8 ta[ETH_ALEN];
	u16 rx_pkt_type;
	struct mwifiex_private *priv =
			mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
					       rx_info->bss_type);

	if (!priv)
		return -1;

	local_rx_pd = (struct rxpd *) (skb->data);
	rx_pkt_type = local_rx_pd->rx_pkt_type;

	rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
					local_rx_pd->rx_pkt_offset);

	if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
	    (u16) skb->len) {
		dev_err(adapter->dev, "wrong rx packet: len=%d,"
			" rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
		       local_rx_pd->rx_pkt_offset, local_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 ret;
	}

	if (local_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, local_rx_pd->rx_pkt_offset);
		skb_trim(skb, local_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 == -1)
				dev_err(adapter->dev, "Rx of A-MSDU failed");
		}
		return 0;
	}

	/*
	 * If the packet is not an unicast packet then send the packet
	 * directly to os. Don't pass thru rx reordering
	 */
	if (!IS_11N_ENABLED(priv) ||
	    memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
		mwifiex_process_rx_packet(adapter, skb);
		return ret;
	}

	if (mwifiex_queuing_ra_based(priv)) {
		memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
	} else {
		if (rx_pkt_type != PKT_TYPE_BAR)
			priv->rx_seq[local_rx_pd->priority] =
						local_rx_pd->seq_num;
		memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
		       ETH_ALEN);
	}

	/* Reorder and send to OS */
	ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
					     local_rx_pd->priority, ta,
					     (u8) local_rx_pd->rx_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;
}
Commit	Line	Data
5e6e3a92 BZ	1	/*
	2	* Marvell Wireless LAN device driver: station RX data handling
	3	*
	4	* Copyright (C) 2011, 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 "util.h"
	23	#include "fw.h"
	24	#include "main.h"
	25	#include "11n_aggr.h"
	26	#include "11n_rxreorder.h"
	27
	28	/*
	29	* This function processes the received packet and forwards it
	30	* to kernel/upper layer.
	31	*
	32	* This function parses through the received packet and determines
	33	* if it is a debug packet or normal packet.
	34	*
	35	* For non-debug packets, the function chops off unnecessary leading
	36	* header bytes, reconstructs the packet as an ethernet frame or
	37	* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
	38	*
	39	* The completion callback is called after processing in complete.
	40	*/
	41	int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
	42	struct sk_buff *skb)
	43	{
270e58e8	44	int ret;
5e6e3a92	45	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
c65a30f3 YAP	46	struct mwifiex_private *priv =
	47	mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
	48	rx_info->bss_type);
5e6e3a92 BZ	49	struct rx_packet_hdr *rx_pkt_hdr;
	50	struct rxpd *local_rx_pd;
	51	int hdr_chop;
	52	struct ethhdr *eth_hdr;
	53	u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	54
	55	local_rx_pd = (struct rxpd *) (skb->data);
	56
	57	rx_pkt_hdr = (struct rx_packet_hdr ) ((u8 ) local_rx_pd +
	58	local_rx_pd->rx_pkt_offset);
	59
	60	if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
	61	rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
	62	/*
	63	* Replace the 803 header and rfc1042 header (llc/snap) with an
	64	* EthernetII header, keep the src/dst and snap_type
	65	* (ethertype).
	66	* The firmware only passes up SNAP frames converting
	67	* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
	68	* To create the Ethernet II, just move the src, dst address
	69	* right before the snap_type.
	70	*/
	71	eth_hdr = (struct ethhdr *)
	72	((u8 *) &rx_pkt_hdr->eth803_hdr
	73	+ sizeof(rx_pkt_hdr->eth803_hdr) +
	74	sizeof(rx_pkt_hdr->rfc1042_hdr)
	75	- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
	76	- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
	77	- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
	78
	79	memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
	80	sizeof(eth_hdr->h_source));
	81	memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
	82	sizeof(eth_hdr->h_dest));
	83
	84	/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
	85	header that was removed. */
	86	hdr_chop = (u8 ) eth_hdr - (u8 ) local_rx_pd;
	87	} else {
	88	/* Chop off the rxpd */
	89	hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
	90	(u8 *) local_rx_pd;
	91	}
	92
	93	/* Chop off the leading header bytes so the it points to the start of
	94	either the reconstructed EthII frame or the 802.2/llc/snap frame */
	95	skb_pull(skb, hdr_chop);
	96
	97	priv->rxpd_rate = local_rx_pd->rx_rate;
	98
	99	priv->rxpd_htinfo = local_rx_pd->ht_info;
	100
	101	ret = mwifiex_recv_packet(adapter, skb);
	102	if (ret == -1)
	103	dev_err(adapter->dev, "recv packet failed\n");
	104
	105	return ret;
	106	}
	107
	108	/*
	109	* This function processes the received buffer.
	110	*
	111	* The function looks into the RxPD and performs sanity tests on the
	112	* received buffer to ensure its a valid packet, before processing it
113	* further. If the packet is determined to be aggregated, it is
114	* de-aggregated accordingly. Non-unicast packets are sent directly to
115	* the kernel/upper layers. Unicast packets are handed over to the
116	* Rx reordering routine if 11n is enabled.
117	*
118	* The completion callback is called after processing in complete.
119	*/
120	int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
121	struct sk_buff *skb)
122	{
123	int ret = 0;
124	struct rxpd *local_rx_pd;
125	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
126	struct rx_packet_hdr *rx_pkt_hdr;
127	u8 ta[ETH_ALEN];
270e58e8	128	u16 rx_pkt_type;
c65a30f3 YAP	129	struct mwifiex_private *priv =
	130	mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
	131	rx_info->bss_type);
5e6e3a92	132
8ed13033 YAP	133	if (!priv)
	134	return -1;
	135
5e6e3a92 BZ	136	local_rx_pd = (struct rxpd *) (skb->data);
	137	rx_pkt_type = local_rx_pd->rx_pkt_type;
	138
	139	rx_pkt_hdr = (struct rx_packet_hdr ) ((u8 ) local_rx_pd +
	140	local_rx_pd->rx_pkt_offset);
	141
	142	if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
	143	(u16) skb->len) {
	144	dev_err(adapter->dev, "wrong rx packet: len=%d,"
	145	" rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
	146	local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
	147	priv->stats.rx_dropped++;
4daffe35 AK	148
	149	if (adapter->if_ops.data_complete)
	150	adapter->if_ops.data_complete(adapter, skb);
	151	else
	152	dev_kfree_skb_any(skb);
	153
5e6e3a92 BZ	154	return ret;
5e6e3a92 BZ	155	}
3b8ab88a	156
5e6e3a92	157	if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
3b8ab88a YAP	158	struct sk_buff_head list;
	159	struct sk_buff *rx_skb;
	160
	161	__skb_queue_head_init(&list);
	162
	163	skb_pull(skb, local_rx_pd->rx_pkt_offset);
	164	skb_trim(skb, local_rx_pd->rx_pkt_length);
	165
	166	ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
c65a30f3	167	priv->wdev->iftype, 0, false);
3b8ab88a YAP	168
	169	while (!skb_queue_empty(&list)) {
	170	rx_skb = __skb_dequeue(&list);
	171	ret = mwifiex_recv_packet(adapter, rx_skb);
	172	if (ret == -1)
	173	dev_err(adapter->dev, "Rx of A-MSDU failed");
	174	}
	175	return 0;
5e6e3a92	176	}
3b8ab88a	177
5e6e3a92 BZ	178	/*
	179	* If the packet is not an unicast packet then send the packet
	180	* directly to os. Don't pass thru rx reordering
	181	*/
	182	if (!IS_11N_ENABLED(priv) \|\|
	183	memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
	184	mwifiex_process_rx_packet(adapter, skb);
	185	return ret;
	186	}
	187
	188	if (mwifiex_queuing_ra_based(priv)) {
	189	memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
	190	} else {
	191	if (rx_pkt_type != PKT_TYPE_BAR)
	192	priv->rx_seq[local_rx_pd->priority] =
	193	local_rx_pd->seq_num;
	194	memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
	195	ETH_ALEN);
	196	}
	197
	198	/* Reorder and send to OS */
	199	ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
	200	local_rx_pd->priority, ta,
	201	(u8) local_rx_pd->rx_pkt_type,
a5ffddb7	202	skb);
5e6e3a92	203
4daffe35 AK	204	if (ret \|\| (rx_pkt_type == PKT_TYPE_BAR)) {
	205	if (adapter->if_ops.data_complete)
	206	adapter->if_ops.data_complete(adapter, skb);
	207	else
	208	dev_kfree_skb_any(skb);
	209	}
8ed13033 YAP	210
	211	if (ret)
	212	priv->stats.rx_dropped++;
5e6e3a92 BZ	213
	214	return ret;
	215	}