sta_rx.c revision 8ed1303321914a70ad580c1d034898e43c39b065 
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 = adapter->priv[rx_info->bss_index];
47	struct rx_packet_hdr *rx_pkt_hdr;
48	struct rxpd *local_rx_pd;
49	int hdr_chop;
50	struct ethhdr *eth_hdr;
51	u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
52
53	local_rx_pd = (struct rxpd *) (skb->data);
54
55	rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
56				local_rx_pd->rx_pkt_offset);
57
58	if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
59		    rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
60		/*
61		 *  Replace the 803 header and rfc1042 header (llc/snap) with an
62		 *    EthernetII header, keep the src/dst and snap_type
63		 *    (ethertype).
64		 *  The firmware only passes up SNAP frames converting
65		 *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
66		 *  To create the Ethernet II, just move the src, dst address
67		 *    right before the snap_type.
68		 */
69		eth_hdr = (struct ethhdr *)
70			((u8 *) &rx_pkt_hdr->eth803_hdr
71			 + sizeof(rx_pkt_hdr->eth803_hdr) +
72			 sizeof(rx_pkt_hdr->rfc1042_hdr)
73			 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
74			 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
75			 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
76
77		memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
78		       sizeof(eth_hdr->h_source));
79		memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
80		       sizeof(eth_hdr->h_dest));
81
82		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
83		   header that was removed. */
84		hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
85	} else {
86		/* Chop off the rxpd */
87		hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
88			(u8 *) local_rx_pd;
89	}
90
91	/* Chop off the leading header bytes so the it points to the start of
92	   either the reconstructed EthII frame or the 802.2/llc/snap frame */
93	skb_pull(skb, hdr_chop);
94
95	priv->rxpd_rate = local_rx_pd->rx_rate;
96
97	priv->rxpd_htinfo = local_rx_pd->ht_info;
98
99	ret = mwifiex_recv_packet(adapter, skb);
100	if (ret == -1)
101		dev_err(adapter->dev, "recv packet failed\n");
102
103	return ret;
104}
105
106/*
107 * This function processes the received buffer.
108 *
109 * The function looks into the RxPD and performs sanity tests on the
110 * received buffer to ensure its a valid packet, before processing it
111 * further. If the packet is determined to be aggregated, it is
112 * de-aggregated accordingly. Non-unicast packets are sent directly to
113 * the kernel/upper layers. Unicast packets are handed over to the
114 * Rx reordering routine if 11n is enabled.
115 *
116 * The completion callback is called after processing in complete.
117 */
118int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
119				  struct sk_buff *skb)
120{
121	int ret = 0;
122	struct rxpd *local_rx_pd;
123	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
124	struct rx_packet_hdr *rx_pkt_hdr;
125	u8 ta[ETH_ALEN];
126	u16 rx_pkt_type;
127	struct mwifiex_private *priv = adapter->priv[rx_info->bss_index];
128
129	if (!priv)
130		return -1;
131
132	local_rx_pd = (struct rxpd *) (skb->data);
133	rx_pkt_type = local_rx_pd->rx_pkt_type;
134
135	rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
136					local_rx_pd->rx_pkt_offset);
137
138	if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
139	    (u16) skb->len) {
140		dev_err(adapter->dev, "wrong rx packet: len=%d,"
141			" rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
142		       local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
143		priv->stats.rx_dropped++;
144		dev_kfree_skb_any(skb);
145		return ret;
146	}
147
148	if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
149		struct sk_buff_head list;
150		struct sk_buff *rx_skb;
151
152		__skb_queue_head_init(&list);
153
154		skb_pull(skb, local_rx_pd->rx_pkt_offset);
155		skb_trim(skb, local_rx_pd->rx_pkt_length);
156
157		ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
158				priv->wdev->iftype, 0, false);
159
160		while (!skb_queue_empty(&list)) {
161			rx_skb = __skb_dequeue(&list);
162			ret = mwifiex_recv_packet(adapter, rx_skb);
163			if (ret == -1)
164				dev_err(adapter->dev, "Rx of A-MSDU failed");
165		}
166		return 0;
167	}
168
169	/*
170	 * If the packet is not an unicast packet then send the packet
171	 * directly to os. Don't pass thru rx reordering
172	 */
173	if (!IS_11N_ENABLED(priv) ||
174	    memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
175		mwifiex_process_rx_packet(adapter, skb);
176		return ret;
177	}
178
179	if (mwifiex_queuing_ra_based(priv)) {
180		memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
181	} else {
182		if (rx_pkt_type != PKT_TYPE_BAR)
183			priv->rx_seq[local_rx_pd->priority] =
184						local_rx_pd->seq_num;
185		memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
186		       ETH_ALEN);
187	}
188
189	/* Reorder and send to OS */
190	ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
191					     local_rx_pd->priority, ta,
192					     (u8) local_rx_pd->rx_pkt_type,
193					     skb);
194
195	if (ret || (rx_pkt_type == PKT_TYPE_BAR))
196		dev_kfree_skb_any(skb);
197
198	if (ret)
199		priv->stats.rx_dropped++;
200
201	return ret;
202}
203