sta_tx.c revision 636c4598499eeacce0893dc8d91113b904bd531e
1/* 2 * Marvell Wireless LAN device driver: station TX 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 "wmm.h" 26 27/* 28 * This function fills the TxPD for tx packets. 29 * 30 * The Tx buffer received by this function should already have the 31 * header space allocated for TxPD. 32 * 33 * This function inserts the TxPD in between interface header and actual 34 * data and adjusts the buffer pointers accordingly. 35 * 36 * The following TxPD fields are set by this function, as required - 37 * - BSS number 38 * - Tx packet length and offset 39 * - Priority 40 * - Packet delay 41 * - Priority specific Tx control 42 * - Flags 43 */ 44void *mwifiex_process_sta_txpd(struct mwifiex_private *priv, 45 struct sk_buff *skb) 46{ 47 struct mwifiex_adapter *adapter = priv->adapter; 48 struct txpd *local_tx_pd; 49 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); 50 51 if (!skb->len) { 52 dev_err(adapter->dev, "Tx: bad packet length: %d\n", 53 skb->len); 54 tx_info->status_code = -1; 55 return skb->data; 56 } 57 58 BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN)); 59 skb_push(skb, sizeof(*local_tx_pd)); 60 61 local_tx_pd = (struct txpd *) skb->data; 62 memset(local_tx_pd, 0, sizeof(struct txpd)); 63 local_tx_pd->bss_num = priv->bss_num; 64 local_tx_pd->bss_type = priv->bss_type; 65 local_tx_pd->tx_pkt_length = cpu_to_le16((u16) (skb->len - 66 sizeof(struct txpd))); 67 68 local_tx_pd->priority = (u8) skb->priority; 69 local_tx_pd->pkt_delay_2ms = 70 mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 71 72 if (local_tx_pd->priority < 73 ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) 74 /* 75 * Set the priority specific tx_control field, setting of 0 will 76 * cause the default value to be used later in this function 77 */ 78 local_tx_pd->tx_control = 79 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd-> 80 priority]); 81 82 if (adapter->pps_uapsd_mode) { 83 if (mwifiex_check_last_packet_indication(priv)) { 84 adapter->tx_lock_flag = true; 85 local_tx_pd->flags = 86 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; 87 } 88 } 89 90 /* Offset of actual data */ 91 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); 92 93 /* make space for INTF_HEADER_LEN */ 94 skb_push(skb, INTF_HEADER_LEN); 95 96 if (!local_tx_pd->tx_control) 97 /* TxCtrl set by user or default */ 98 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 99 100 return skb->data; 101} 102 103/* 104 * This function tells firmware to send a NULL data packet. 105 * 106 * The function creates a NULL data packet with TxPD and sends to the 107 * firmware for transmission, with highest priority setting. 108 */ 109int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags) 110{ 111 struct mwifiex_adapter *adapter = priv->adapter; 112 struct txpd *local_tx_pd; 113/* sizeof(struct txpd) + Interface specific header */ 114#define NULL_PACKET_HDR 64 115 u32 data_len = NULL_PACKET_HDR; 116 struct sk_buff *skb = NULL; 117 int ret = 0; 118 struct mwifiex_txinfo *tx_info = NULL; 119 120 if (adapter->surprise_removed) 121 return -1; 122 123 if (!priv->media_connected) 124 return -1; 125 126 if (adapter->data_sent) 127 return -1; 128 129 skb = dev_alloc_skb(data_len); 130 if (!skb) 131 return -1; 132 133 tx_info = MWIFIEX_SKB_TXCB(skb); 134 tx_info->bss_index = priv->bss_index; 135 skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN); 136 skb_push(skb, sizeof(struct txpd)); 137 138 local_tx_pd = (struct txpd *) skb->data; 139 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 140 local_tx_pd->flags = flags; 141 local_tx_pd->priority = WMM_HIGHEST_PRIORITY; 142 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); 143 local_tx_pd->bss_num = priv->bss_num; 144 local_tx_pd->bss_type = priv->bss_type; 145 146 skb_push(skb, INTF_HEADER_LEN); 147 148 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 149 skb->data, skb->len, NULL); 150 switch (ret) { 151 case -EBUSY: 152 adapter->data_sent = true; 153 /* Fall through FAILURE handling */ 154 case -1: 155 dev_kfree_skb_any(skb); 156 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n", 157 __func__, ret); 158 adapter->dbg.num_tx_host_to_card_failure++; 159 break; 160 case 0: 161 dev_kfree_skb_any(skb); 162 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n", 163 __func__); 164 adapter->tx_lock_flag = true; 165 break; 166 case -EINPROGRESS: 167 break; 168 default: 169 break; 170 } 171 172 return ret; 173} 174 175/* 176 * This function checks if we need to send last packet indication. 177 */ 178u8 179mwifiex_check_last_packet_indication(struct mwifiex_private *priv) 180{ 181 struct mwifiex_adapter *adapter = priv->adapter; 182 u8 ret = false; 183 184 if (!adapter->sleep_period.period) 185 return ret; 186 if (mwifiex_wmm_lists_empty(adapter)) 187 ret = true; 188 189 if (ret && !adapter->cmd_sent && !adapter->curr_cmd 190 && !is_command_pending(adapter)) { 191 adapter->delay_null_pkt = false; 192 ret = true; 193 } else { 194 ret = false; 195 adapter->delay_null_pkt = true; 196 } 197 return ret; 198} 199