wireless: mwifiex: initial commit for Marvell mwifiex driver
[linux-2.6.git] / drivers / net / wireless / mwifiex / sta_rx.c
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 {
44         int ret = 0;
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  */
118 int 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 = 0;
127         struct mwifiex_private *priv = adapter->priv[rx_info->bss_index];
128
129         local_rx_pd = (struct rxpd *) (skb->data);
130         rx_pkt_type = local_rx_pd->rx_pkt_type;
131
132         rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
133                                         local_rx_pd->rx_pkt_offset);
134
135         if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
136             (u16) skb->len) {
137                 dev_err(adapter->dev, "wrong rx packet: len=%d,"
138                         " rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
139                        local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
140                 priv->stats.rx_dropped++;
141                 dev_kfree_skb_any(skb);
142                 return ret;
143         }
144         if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
145                 mwifiex_11n_deaggregate_pkt(priv, skb);
146                 return ret;
147         }
148         /*
149          * If the packet is not an unicast packet then send the packet
150          * directly to os. Don't pass thru rx reordering
151          */
152         if (!IS_11N_ENABLED(priv) ||
153             memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
154                 mwifiex_process_rx_packet(adapter, skb);
155                 return ret;
156         }
157
158         if (mwifiex_queuing_ra_based(priv)) {
159                 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
160         } else {
161                 if (rx_pkt_type != PKT_TYPE_BAR)
162                         priv->rx_seq[local_rx_pd->priority] =
163                                                 local_rx_pd->seq_num;
164                 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
165                        ETH_ALEN);
166         }
167
168         /* Reorder and send to OS */
169         ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
170                                              local_rx_pd->priority, ta,
171                                              (u8) local_rx_pd->rx_pkt_type,
172                                                 (void *) skb);
173
174         if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
175                 if (priv && (ret == -1))
176                         priv->stats.rx_dropped++;
177
178                 dev_kfree_skb_any(skb);
179         }
180
181         return ret;
182 }