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_adapter * adapter,struct sk_buff * skb)41 int 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 */
mwifiex_process_sta_rx_packet(struct mwifiex_adapter * adapter,struct sk_buff * skb)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];
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 dev_kfree_skb_any(skb);
149 return ret;
150 }
151
152 if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
153 struct sk_buff_head list;
154 struct sk_buff *rx_skb;
155
156 __skb_queue_head_init(&list);
157
158 skb_pull(skb, local_rx_pd->rx_pkt_offset);
159 skb_trim(skb, local_rx_pd->rx_pkt_length);
160
161 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
162 priv->wdev->iftype, 0, false);
163
164 while (!skb_queue_empty(&list)) {
165 rx_skb = __skb_dequeue(&list);
166 ret = mwifiex_recv_packet(adapter, rx_skb);
167 if (ret == -1)
168 dev_err(adapter->dev, "Rx of A-MSDU failed");
169 }
170 return 0;
171 }
172
173 /*
174 * If the packet is not an unicast packet then send the packet
175 * directly to os. Don't pass thru rx reordering
176 */
177 if (!IS_11N_ENABLED(priv) ||
178 memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
179 mwifiex_process_rx_packet(adapter, skb);
180 return ret;
181 }
182
183 if (mwifiex_queuing_ra_based(priv)) {
184 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
185 } else {
186 if (rx_pkt_type != PKT_TYPE_BAR)
187 priv->rx_seq[local_rx_pd->priority] =
188 local_rx_pd->seq_num;
189 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
190 ETH_ALEN);
191 }
192
193 /* Reorder and send to OS */
194 ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
195 local_rx_pd->priority, ta,
196 (u8) local_rx_pd->rx_pkt_type,
197 skb);
198
199 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
200 dev_kfree_skb_any(skb);
201
202 if (ret)
203 priv->stats.rx_dropped++;
204
205 return ret;
206 }
207