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 */ 41int 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 */ 120int 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