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++;