2 * Marvell Wireless LAN device driver: station RX data handling
4 * Copyright (C) 2011, Marvell International Ltd.
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.
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.
26 #include "11n_rxreorder.h"
29 * This function processes the received packet and forwards it
30 * to kernel/upper layer.
32 * This function parses through the received packet and determines
33 * if it is a debug packet or normal packet.
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.
39 * The completion callback is called after processing in complete.
41 int mwifiex_process_rx_packet(struct mwifiex_adapter
*adapter
,
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
,
49 struct rx_packet_hdr
*rx_pkt_hdr
;
50 struct rxpd
*local_rx_pd
;
52 struct ethhdr
*eth_hdr
;
53 u8 rfc1042_eth_hdr
[ETH_ALEN
] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
55 local_rx_pd
= (struct rxpd
*) (skb
->data
);
57 rx_pkt_hdr
= (struct rx_packet_hdr
*) ((u8
*) local_rx_pd
+
58 local_rx_pd
->rx_pkt_offset
);
60 if (!memcmp(&rx_pkt_hdr
->rfc1042_hdr
,
61 rfc1042_eth_hdr
, sizeof(rfc1042_eth_hdr
))) {
63 * Replace the 803 header and rfc1042 header (llc/snap) with an
64 * EthernetII header, keep the src/dst and snap_type
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.
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
));
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
));
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
;
88 /* Chop off the rxpd */
89 hdr_chop
= (u8
*) &rx_pkt_hdr
->eth803_hdr
-
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
);
97 priv
->rxpd_rate
= local_rx_pd
->rx_rate
;
99 priv
->rxpd_htinfo
= local_rx_pd
->ht_info
;
101 ret
= mwifiex_recv_packet(adapter
, skb
);
103 dev_err(adapter
->dev
, "recv packet failed\n");
109 * This function processes the received buffer.
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.
118 * The completion callback is called after processing in complete.
120 int mwifiex_process_sta_rx_packet(struct mwifiex_adapter
*adapter
,
124 struct rxpd
*local_rx_pd
;
125 struct mwifiex_rxinfo
*rx_info
= MWIFIEX_SKB_RXCB(skb
);
126 struct rx_packet_hdr
*rx_pkt_hdr
;
129 struct mwifiex_private
*priv
=
130 mwifiex_get_priv_by_id(adapter
, rx_info
->bss_num
,
136 local_rx_pd
= (struct rxpd
*) (skb
->data
);
137 rx_pkt_type
= local_rx_pd
->rx_pkt_type
;
139 rx_pkt_hdr
= (struct rx_packet_hdr
*) ((u8
*) local_rx_pd
+
140 local_rx_pd
->rx_pkt_offset
);
142 if ((local_rx_pd
->rx_pkt_offset
+ local_rx_pd
->rx_pkt_length
) >
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
);
152 if (local_rx_pd
->rx_pkt_type
== PKT_TYPE_AMSDU
) {
153 struct sk_buff_head list
;
154 struct sk_buff
*rx_skb
;
156 __skb_queue_head_init(&list
);
158 skb_pull(skb
, local_rx_pd
->rx_pkt_offset
);
159 skb_trim(skb
, local_rx_pd
->rx_pkt_length
);
161 ieee80211_amsdu_to_8023s(skb
, &list
, priv
->curr_addr
,
162 priv
->wdev
->iftype
, 0, false);
164 while (!skb_queue_empty(&list
)) {
165 rx_skb
= __skb_dequeue(&list
);
166 ret
= mwifiex_recv_packet(adapter
, rx_skb
);
168 dev_err(adapter
->dev
, "Rx of A-MSDU failed");
174 * If the packet is not an unicast packet then send the packet
175 * directly to os. Don't pass thru rx reordering
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
);
183 if (mwifiex_queuing_ra_based(priv
)) {
184 memcpy(ta
, rx_pkt_hdr
->eth803_hdr
.h_source
, ETH_ALEN
);
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
,
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
,
199 if (ret
|| (rx_pkt_type
== PKT_TYPE_BAR
))
200 dev_kfree_skb_any(skb
);
203 priv
->stats
.rx_dropped
++;
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