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 */
mwifiex_process_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)41 int mwifiex_process_rx_packet(struct mwifiex_private *priv,
42 struct sk_buff *skb)
43 {
44 int ret;
45 struct rx_packet_hdr *rx_pkt_hdr;
46 struct rxpd *local_rx_pd;
47 int hdr_chop;
48 struct ethhdr *eth_hdr;
49 u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
50
51 local_rx_pd = (struct rxpd *) (skb->data);
52
53 rx_pkt_hdr = (void *)local_rx_pd +
54 le16_to_cpu(local_rx_pd->rx_pkt_offset);
55
56 if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
57 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
58 /*
59 * Replace the 803 header and rfc1042 header (llc/snap) with an
60 * EthernetII header, keep the src/dst and snap_type
61 * (ethertype).
62 * The firmware only passes up SNAP frames converting
63 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
64 * To create the Ethernet II, just move the src, dst address
65 * right before the snap_type.
66 */
67 eth_hdr = (struct ethhdr *)
68 ((u8 *) &rx_pkt_hdr->eth803_hdr
69 + sizeof(rx_pkt_hdr->eth803_hdr) +
70 sizeof(rx_pkt_hdr->rfc1042_hdr)
71 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
72 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
73 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
74
75 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
76 sizeof(eth_hdr->h_source));
77 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
78 sizeof(eth_hdr->h_dest));
79
80 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
81 header that was removed. */
82 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
83 } else {
84 /* Chop off the rxpd */
85 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
86 (u8 *) local_rx_pd;
87 }
88
89 /* Chop off the leading header bytes so the it points to the start of
90 either the reconstructed EthII frame or the 802.2/llc/snap frame */
91 skb_pull(skb, hdr_chop);
92
93 priv->rxpd_rate = local_rx_pd->rx_rate;
94
95 priv->rxpd_htinfo = local_rx_pd->ht_info;
96
97 ret = mwifiex_recv_packet(priv, skb);
98 if (ret == -1)
99 dev_err(priv->adapter->dev, "recv packet failed\n");
100
101 return ret;
102 }
103
104 /*
105 * This function processes the received buffer.
106 *
107 * The function looks into the RxPD and performs sanity tests on the
108 * received buffer to ensure its a valid packet, before processing it
109 * further. If the packet is determined to be aggregated, it is
110 * de-aggregated accordingly. Non-unicast packets are sent directly to
111 * the kernel/upper layers. Unicast packets are handed over to the
112 * Rx reordering routine if 11n is enabled.
113 *
114 * The completion callback is called after processing in complete.
115 */
mwifiex_process_sta_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)116 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
117 struct sk_buff *skb)
118 {
119 struct mwifiex_adapter *adapter = priv->adapter;
120 int ret = 0;
121 struct rxpd *local_rx_pd;
122 struct rx_packet_hdr *rx_pkt_hdr;
123 u8 ta[ETH_ALEN];
124 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
125
126 local_rx_pd = (struct rxpd *) (skb->data);
127 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
128 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
129 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
130 seq_num = le16_to_cpu(local_rx_pd->seq_num);
131
132 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
133
134 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
135 dev_err(adapter->dev,
136 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
137 skb->len, rx_pkt_offset, rx_pkt_length);
138 priv->stats.rx_dropped++;
139
140 if (adapter->if_ops.data_complete)
141 adapter->if_ops.data_complete(adapter, skb);
142 else
143 dev_kfree_skb_any(skb);
144
145 return ret;
146 }
147
148 if (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, rx_pkt_offset);
155 skb_trim(skb, 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(priv, rx_skb);
163 if (ret == -1)
164 dev_err(adapter->dev, "Rx of A-MSDU failed");
165 }
166 return 0;
167 } else if (rx_pkt_type == PKT_TYPE_MGMT) {
168 ret = mwifiex_process_mgmt_packet(priv, skb);
169 if (ret)
170 dev_err(adapter->dev, "Rx of mgmt packet failed");
171 dev_kfree_skb_any(skb);
172 return ret;
173 }
174
175 /*
176 * If the packet is not an unicast packet then send the packet
177 * directly to os. Don't pass thru rx reordering
178 */
179 if (!IS_11N_ENABLED(priv) ||
180 memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
181 mwifiex_process_rx_packet(priv, skb);
182 return ret;
183 }
184
185 if (mwifiex_queuing_ra_based(priv)) {
186 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
187 } else {
188 if (rx_pkt_type != PKT_TYPE_BAR)
189 priv->rx_seq[local_rx_pd->priority] = seq_num;
190 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
191 ETH_ALEN);
192 }
193
194 /* Reorder and send to OS */
195 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
196 ta, (u8) rx_pkt_type, skb);
197
198 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
199 if (adapter->if_ops.data_complete)
200 adapter->if_ops.data_complete(adapter, skb);
201 else
202 dev_kfree_skb_any(skb);
203 }
204
205 if (ret)
206 priv->stats.rx_dropped++;
207
208 return ret;
209 }
210