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 u8 pad; 51 52 if (!skb->len) { 53 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); 54 tx_info->status_code = -1; 55 return skb->data; 56 } 57 58 /* If skb->data is not aligned; add padding */ 59 pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; 60 61 BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN 62 + pad)); 63 skb_push(skb, sizeof(*local_tx_pd) + pad); 64 65 local_tx_pd = (struct txpd *) skb->data; 66 memset(local_tx_pd, 0, sizeof(struct txpd)); 67 local_tx_pd->bss_num = priv->bss_num; 68 local_tx_pd->bss_type = priv->bss_type; 69 local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len - 70 (sizeof(struct txpd) 71 + pad))); 72 73 local_tx_pd->priority = (u8) skb->priority; 74 local_tx_pd->pkt_delay_2ms = 75 mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 76 77 if (local_tx_pd->priority < 78 ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) 79 /* 80 * Set the priority specific tx_control field, setting of 0 will 81 * cause the default value to be used later in this function 82 */ 83 local_tx_pd->tx_control = 84 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd-> 85 priority]); 86 87 if (adapter->pps_uapsd_mode) { 88 if (mwifiex_check_last_packet_indication(priv)) { 89 adapter->tx_lock_flag = true; 90 local_tx_pd->flags = 91 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; 92 } 93 } 94 95 /* Offset of actual data */ 96 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + pad); 97 98 /* make space for INTF_HEADER_LEN */ 99 skb_push(skb, INTF_HEADER_LEN); 100 101 if (!local_tx_pd->tx_control) 102 /* TxCtrl set by user or default */ 103 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 104 105 return skb->data; 106} 107 108/* 109 * This function tells firmware to send a NULL data packet. 110 * 111 * The function creates a NULL data packet with TxPD and sends to the 112 * firmware for transmission, with highest priority setting. 113 */ 114int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags) 115{ 116 struct mwifiex_adapter *adapter = priv->adapter; 117 struct txpd *local_tx_pd; 118/* sizeof(struct txpd) + Interface specific header */ 119#define NULL_PACKET_HDR 64 120 u32 data_len = NULL_PACKET_HDR; 121 struct sk_buff *skb; 122 int ret; 123 struct mwifiex_txinfo *tx_info = NULL; 124 125 if (adapter->surprise_removed) 126 return -1; 127 128 if (!priv->media_connected) 129 return -1; 130 131 if (adapter->data_sent) 132 return -1; 133 134 skb = dev_alloc_skb(data_len); 135 if (!skb) 136 return -1; 137 138 tx_info = MWIFIEX_SKB_TXCB(skb); 139 tx_info->bss_num = priv->bss_num; 140 tx_info->bss_type = priv->bss_type; 141 skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN); 142 skb_push(skb, sizeof(struct txpd)); 143 144 local_tx_pd = (struct txpd *) skb->data; 145 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 146 local_tx_pd->flags = flags; 147 local_tx_pd->priority = WMM_HIGHEST_PRIORITY; 148 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); 149 local_tx_pd->bss_num = priv->bss_num; 150 local_tx_pd->bss_type = priv->bss_type; 151 152 skb_push(skb, INTF_HEADER_LEN); 153 154 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 155 skb, NULL); 156 switch (ret) { 157 case -EBUSY: 158 adapter->data_sent = true; 159 /* Fall through FAILURE handling */ 160 case -1: 161 dev_kfree_skb_any(skb); 162 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n", 163 __func__, ret); 164 adapter->dbg.num_tx_host_to_card_failure++; 165 break; 166 case 0: 167 dev_kfree_skb_any(skb); 168 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n", 169 __func__); 170 adapter->tx_lock_flag = true; 171 break; 172 case -EINPROGRESS: 173 break; 174 default: 175 break; 176 } 177 178 return ret; 179} 180 181/* 182 * This function checks if we need to send last packet indication. 183 */ 184u8 185mwifiex_check_last_packet_indication(struct mwifiex_private *priv) 186{ 187 struct mwifiex_adapter *adapter = priv->adapter; 188 u8 ret = false; 189 190 if (!adapter->sleep_period.period) 191 return ret; 192 if (mwifiex_wmm_lists_empty(adapter)) 193 ret = true; 194 195 if (ret && !adapter->cmd_sent && !adapter->curr_cmd && 196 !is_command_pending(adapter)) { 197 adapter->delay_null_pkt = false; 198 ret = true; 199 } else { 200 ret = false; 201 adapter->delay_null_pkt = true; 202 } 203 return ret; 204} 205