drivers/net/wireless/mwifiex/sta_tx.c

   1 /*
   2  * Marvell Wireless LAN device driver: station TX data handling
   3  *
   4  * Copyright (C) 2011-2014, 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  */
  44 void *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         u16 pkt_type, pkt_offset;
  52
  53         if (!skb->len) {
  54                 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
  55                 tx_info->status_code = -1;
  56                 return skb->data;
  57         }
  58
  59         pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
  60
  61         /* If skb->data is not aligned; add padding */
  62         pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
  63
  64         BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
  65                                     + pad));
  66         skb_push(skb, sizeof(*local_tx_pd) + pad);
  67
  68         local_tx_pd = (struct txpd *) skb->data;
  69         memset(local_tx_pd, 0, sizeof(struct txpd));
  70         local_tx_pd->bss_num = priv->bss_num;
  71         local_tx_pd->bss_type = priv->bss_type;
  72         local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
  73                                                        (sizeof(struct txpd)
  74                                                         + pad)));
  75
  76         local_tx_pd->priority = (u8) skb->priority;
  77         local_tx_pd->pkt_delay_2ms =
  78                                 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
  79
  80         if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
  81             tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
  82                 local_tx_pd->tx_token_id = tx_info->ack_frame_id;
  83                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
  84         }
  85
  86         if (local_tx_pd->priority <
  87             ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
  88                 /*
  89                  * Set the priority specific tx_control field, setting of 0 will
  90                  *   cause the default value to be used later in this function
  91                  */
  92                 local_tx_pd->tx_control =
  93                         cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
  94                                                                    priority]);
  95
  96         if (adapter->pps_uapsd_mode) {
  97                 if (mwifiex_check_last_packet_indication(priv)) {
  98                         adapter->tx_lock_flag = true;
  99                         local_tx_pd->flags =
 100                                 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
 101                 }
 102         }
 103
 104         if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
 105                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
 106
 107         /* Offset of actual data */
 108         pkt_offset = sizeof(struct txpd) + pad;
 109         if (pkt_type == PKT_TYPE_MGMT) {
 110                 /* Set the packet type and add header for management frame */
 111                 local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
 112                 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 113         }
 114
 115         local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
 116
 117         /* make space for INTF_HEADER_LEN */
 118         skb_push(skb, INTF_HEADER_LEN);
 119
 120         if (!local_tx_pd->tx_control)
 121                 /* TxCtrl set by user or default */
 122                 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 123
 124         return skb->data;
 125 }
 126
 127 /*
 128  * This function tells firmware to send a NULL data packet.
 129  *
 130  * The function creates a NULL data packet with TxPD and sends to the
 131  * firmware for transmission, with highest priority setting.
 132  */
 133 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
 134 {
 135         struct mwifiex_adapter *adapter = priv->adapter;
 136         struct txpd *local_tx_pd;
 137         struct mwifiex_tx_param tx_param;
 138 /* sizeof(struct txpd) + Interface specific header */
 139 #define NULL_PACKET_HDR 64
 140         u32 data_len = NULL_PACKET_HDR;
 141         struct sk_buff *skb;
 142         int ret;
 143         struct mwifiex_txinfo *tx_info = NULL;
 144
 145         if (adapter->surprise_removed)
 146                 return -1;
 147
 148         if (!priv->media_connected)
 149                 return -1;
 150
 151         if (adapter->data_sent)
 152                 return -1;
 153
 154         skb = dev_alloc_skb(data_len);
 155         if (!skb)
 156                 return -1;
 157
 158         tx_info = MWIFIEX_SKB_TXCB(skb);
 159         memset(tx_info, 0, sizeof(*tx_info));
 160         tx_info->bss_num = priv->bss_num;
 161         tx_info->bss_type = priv->bss_type;
 162         tx_info->pkt_len = data_len - (sizeof(struct txpd) + INTF_HEADER_LEN);
 163         skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
 164         skb_push(skb, sizeof(struct txpd));
 165
 166         local_tx_pd = (struct txpd *) skb->data;
 167         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 168         local_tx_pd->flags = flags;
 169         local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
 170         local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
 171         local_tx_pd->bss_num = priv->bss_num;
 172         local_tx_pd->bss_type = priv->bss_type;
 173
 174         if (adapter->iface_type == MWIFIEX_USB) {
 175                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
 176                                                    skb, NULL);
 177         } else {
 178                 skb_push(skb, INTF_HEADER_LEN);
 179                 tx_param.next_pkt_len = 0;
 180                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 181                                                    skb, &tx_param);
 182         }
 183         switch (ret) {
 184         case -EBUSY:
 185                 adapter->data_sent = true;
 186                 /* Fall through FAILURE handling */
 187         case -1:
 188                 dev_kfree_skb_any(skb);
 189                 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
 190                         __func__, ret);
 191                 adapter->dbg.num_tx_host_to_card_failure++;
 192                 break;
 193         case 0:
 194                 dev_kfree_skb_any(skb);
 195                 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
 196                         __func__);
 197                 adapter->tx_lock_flag = true;
 198                 break;
 199         case -EINPROGRESS:
 200                 break;
 201         default:
 202                 break;
 203         }
 204
 205         return ret;
 206 }
 207
 208 /*
 209  * This function checks if we need to send last packet indication.
 210  */
 211 u8
 212 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
 213 {
 214         struct mwifiex_adapter *adapter = priv->adapter;
 215         u8 ret = false;
 216
 217         if (!adapter->sleep_period.period)
 218                 return ret;
 219         if (mwifiex_wmm_lists_empty(adapter))
 220                         ret = true;
 221
 222         if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
 223             !is_command_pending(adapter)) {
 224                 adapter->delay_null_pkt = false;
 225                 ret = true;
 226         } else {
 227                 ret = false;
 228                 adapter->delay_null_pkt = true;
 229         }
 230         return ret;
 231 }