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 = 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 */ 118int 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; 127 struct mwifiex_private *priv = adapter->priv[rx_info->bss_index]; 128 129 if (!priv) 130 return -1; 131 132 local_rx_pd = (struct rxpd *) (skb->data); 133 rx_pkt_type = local_rx_pd->rx_pkt_type; 134 135 rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd + 136 local_rx_pd->rx_pkt_offset); 137 138 if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) > 139 (u16) skb->len) { 140 dev_err(adapter->dev, "wrong rx packet: len=%d," 141 " rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len, 142 local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length); 143 priv->stats.rx_dropped++; 144 dev_kfree_skb_any(skb); 145 return ret; 146 } 147 148 if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) { 149 struct sk_buff_head list; 150 struct sk_buff *rx_skb; 151 152 __skb_queue_head_init(&list); 153 154 skb_pull(skb, local_rx_pd->rx_pkt_offset); 155 skb_trim(skb, local_rx_pd->rx_pkt_length); 156 157 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr, 158 priv->wdev->iftype, 0, false); 159 160 while (!skb_queue_empty(&list)) { 161 rx_skb = __skb_dequeue(&list); 162 ret = mwifiex_recv_packet(adapter, rx_skb); 163 if (ret == -1) 164 dev_err(adapter->dev, "Rx of A-MSDU failed"); 165 } 166 return 0; 167 } 168 169 /* 170 * If the packet is not an unicast packet then send the packet 171 * directly to os. Don't pass thru rx reordering 172 */ 173 if (!IS_11N_ENABLED(priv) || 174 memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) { 175 mwifiex_process_rx_packet(adapter, skb); 176 return ret; 177 } 178 179 if (mwifiex_queuing_ra_based(priv)) { 180 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 181 } else { 182 if (rx_pkt_type != PKT_TYPE_BAR) 183 priv->rx_seq[local_rx_pd->priority] = 184 local_rx_pd->seq_num; 185 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address, 186 ETH_ALEN); 187 } 188 189 /* Reorder and send to OS */ 190 ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num, 191 local_rx_pd->priority, ta, 192 (u8) local_rx_pd->rx_pkt_type, 193 skb); 194 195 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 196 dev_kfree_skb_any(skb); 197 198 if (ret) 199 priv->stats.rx_dropped++; 200 201 return ret; 202} 203