sta_rx.c revision 9da9a3b29ba6a9a98e437f24576f13cbe259997b
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 = 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; 50 int hdr_chop; 51 struct ethhdr *eth_hdr; 52 u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 53 54 local_rx_pd = (struct rxpd *) (skb->data); 55 56 rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd + 57 local_rx_pd->rx_pkt_offset); 58 59 if (!memcmp(&rx_pkt_hdr->rfc1042_hdr, 60 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) { 61 /* 62 * Replace the 803 header and rfc1042 header (llc/snap) with an 63 * EthernetII header, keep the src/dst and snap_type 64 * (ethertype). 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. 69 */ 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)); 77 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)); 82 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; 86 } else { 87 /* Chop off the rxpd */ 88 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr - 89 (u8 *) local_rx_pd; 90 } 91 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); 95 96 priv->rxpd_rate = local_rx_pd->rx_rate; 97 98 priv->rxpd_htinfo = local_rx_pd->ht_info; 99 100 ret = mwifiex_recv_packet(adapter, skb); 101 if (ret == -1) 102 dev_err(adapter->dev, "recv packet failed\n"); 103 104 return ret; 105} 106 107/* 108 * This function processes the received buffer. 109 * 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. 116 * 117 * The completion callback is called after processing in complete. 118 */ 119int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter, 120 struct sk_buff *skb) 121{ 122 int ret = 0; 123 struct rxpd *local_rx_pd; 124 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); 125 struct rx_packet_hdr *rx_pkt_hdr; 126 u8 ta[ETH_ALEN]; 127 u16 rx_pkt_type; 128 struct mwifiex_private *priv = mwifiex_get_priv_by_id(adapter, 129 rx_info->bss_num, rx_info->bss_type); 130 131 if (!priv) 132 return -1; 133 134 local_rx_pd = (struct rxpd *) (skb->data); 135 rx_pkt_type = local_rx_pd->rx_pkt_type; 136 137 rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd + 138 local_rx_pd->rx_pkt_offset); 139 140 if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) > 141 (u16) skb->len) { 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); 147 return ret; 148 } 149 150 if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) { 151 struct sk_buff_head list; 152 struct sk_buff *rx_skb; 153 154 __skb_queue_head_init(&list); 155 156 skb_pull(skb, local_rx_pd->rx_pkt_offset); 157 skb_trim(skb, local_rx_pd->rx_pkt_length); 158 159 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr, 160 priv->wdev->iftype, 0, false); 161 162 while (!skb_queue_empty(&list)) { 163 rx_skb = __skb_dequeue(&list); 164 ret = mwifiex_recv_packet(adapter, rx_skb); 165 if (ret == -1) 166 dev_err(adapter->dev, "Rx of A-MSDU failed"); 167 } 168 return 0; 169 } 170 171 /* 172 * If the packet is not an unicast packet then send the packet 173 * directly to os. Don't pass thru rx reordering 174 */ 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); 178 return ret; 179 } 180 181 if (mwifiex_queuing_ra_based(priv)) { 182 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 183 } else { 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, 188 ETH_ALEN); 189 } 190 191 /* 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, 195 skb); 196 197 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 198 dev_kfree_skb_any(skb); 199 200 if (ret) 201 priv->stats.rx_dropped++; 202 203 return ret; 204} 205