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 = mwifiex_get_priv_by_id(adapter,
47 rx_info->bss_num, rx_info->bss_type);
48 struct rx_packet_hdr *rx_pkt_hdr;
49 struct rxpd *local_rx_pd;
51 struct ethhdr *eth_hdr;
52 u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
54 local_rx_pd = (struct rxpd *) (skb->data);
56 rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
57 local_rx_pd->rx_pkt_offset);
59 if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
60 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
62 * Replace the 803 header and rfc1042 header (llc/snap) with an
63 * EthernetII header, keep the src/dst and snap_type
65 * The firmware only passes up SNAP frames converting
66 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
67 * To create the Ethernet II, just move the src, dst address
68 * right before the snap_type.
70 eth_hdr = (struct ethhdr *)
71 ((u8 *) &rx_pkt_hdr->eth803_hdr
72 + sizeof(rx_pkt_hdr->eth803_hdr) +
73 sizeof(rx_pkt_hdr->rfc1042_hdr)
74 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
75 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
76 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
78 memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
79 sizeof(eth_hdr->h_source));
80 memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
81 sizeof(eth_hdr->h_dest));
83 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
84 header that was removed. */
85 hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
87 /* Chop off the rxpd */
88 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
92 /* Chop off the leading header bytes so the it points to the start of
93 either the reconstructed EthII frame or the 802.2/llc/snap frame */
94 skb_pull(skb, hdr_chop);
96 priv->rxpd_rate = local_rx_pd->rx_rate;
98 priv->rxpd_htinfo = local_rx_pd->ht_info;
100 ret = mwifiex_recv_packet(adapter, skb);
102 dev_err(adapter->dev, "recv packet failed\n");
108 * This function processes the received buffer.
110 * The function looks into the RxPD and performs sanity tests on the
111 * received buffer to ensure its a valid packet, before processing it
112 * further. If the packet is determined to be aggregated, it is
113 * de-aggregated accordingly. Non-unicast packets are sent directly to
114 * the kernel/upper layers. Unicast packets are handed over to the
115 * Rx reordering routine if 11n is enabled.
117 * The completion callback is called after processing in complete.
119 int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
123 struct rxpd *local_rx_pd;
124 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
125 struct rx_packet_hdr *rx_pkt_hdr;
128 struct mwifiex_private *priv = mwifiex_get_priv_by_id(adapter,
129 rx_info->bss_num, rx_info->bss_type);
134 local_rx_pd = (struct rxpd *) (skb->data);
135 rx_pkt_type = local_rx_pd->rx_pkt_type;
137 rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
138 local_rx_pd->rx_pkt_offset);
140 if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
142 dev_err(adapter->dev, "wrong rx packet: len=%d,"
143 " rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
144 local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
145 priv->stats.rx_dropped++;
146 dev_kfree_skb_any(skb);
150 if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
151 struct sk_buff_head list;
152 struct sk_buff *rx_skb;
154 __skb_queue_head_init(&list);
156 skb_pull(skb, local_rx_pd->rx_pkt_offset);
157 skb_trim(skb, local_rx_pd->rx_pkt_length);
159 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
160 priv->wdev->iftype, 0, false);
162 while (!skb_queue_empty(&list)) {
163 rx_skb = __skb_dequeue(&list);
164 ret = mwifiex_recv_packet(adapter, rx_skb);
166 dev_err(adapter->dev, "Rx of A-MSDU failed");
172 * If the packet is not an unicast packet then send the packet
173 * directly to os. Don't pass thru rx reordering
175 if (!IS_11N_ENABLED(priv) ||
176 memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
177 mwifiex_process_rx_packet(adapter, skb);
181 if (mwifiex_queuing_ra_based(priv)) {
182 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
184 if (rx_pkt_type != PKT_TYPE_BAR)
185 priv->rx_seq[local_rx_pd->priority] =
186 local_rx_pd->seq_num;
187 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
191 /* Reorder and send to OS */
192 ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
193 local_rx_pd->priority, ta,
194 (u8) local_rx_pd->rx_pkt_type,
197 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
198 dev_kfree_skb_any(skb);
201 priv->stats.rx_dropped++;