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 */
 41int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
 42			      struct sk_buff *skb)
 43{
 44	int ret;
 45	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 46	struct mwifiex_private *priv =
 47			mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
 48					       rx_info->bss_type);
 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 */
120int 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];
128	u16 rx_pkt_type;
129	struct mwifiex_private *priv =
130			mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
131					       rx_info->bss_type);
132
133	if (!priv)
134		return -1;
135
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++;
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
154		return ret;
155	}
156
157	if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
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,
167					 priv->wdev->iftype, 0, false);
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;
176	}
177
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,
202					     skb);
203
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	}
210
211	if (ret)
212		priv->stats.rx_dropped++;
213
214	return ret;
215}