drivers/net/wireless/mwifiex/sta_tx.c

   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  */
  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 (local_tx_pd->priority <
  81             ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
  82                 /*
  83                  * Set the priority specific tx_control field, setting of 0 will
  84                  *   cause the default value to be used later in this function
  85                  */
  86                 local_tx_pd->tx_control =
  87                         cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
  88                                                                    priority]);
  89
  90         if (adapter->pps_uapsd_mode) {
  91                 if (mwifiex_check_last_packet_indication(priv)) {
  92                         adapter->tx_lock_flag = true;
  93                         local_tx_pd->flags =
  94                                 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
  95                 }
  96         }
  97
  98         /* Offset of actual data */
  99         pkt_offset = sizeof(struct txpd) + pad;
 100         if (pkt_type == PKT_TYPE_MGMT) {
 101                 /* Set the packet type and add header for management frame */
 102                 local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
 103                 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 104         }
 105
 106         local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
 107
 108         /* make space for INTF_HEADER_LEN */
 109         skb_push(skb, INTF_HEADER_LEN);
 110
 111         if (!local_tx_pd->tx_control)
 112                 /* TxCtrl set by user or default */
 113                 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 114
 115         return skb->data;
 116 }
 117
 118 /*
 119  * This function tells firmware to send a NULL data packet.
 120  *
 121  * The function creates a NULL data packet with TxPD and sends to the
 122  * firmware for transmission, with highest priority setting.
 123  */
 124 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
 125 {
 126         struct mwifiex_adapter *adapter = priv->adapter;
 127         struct txpd *local_tx_pd;
 128 /* sizeof(struct txpd) + Interface specific header */
 129 #define NULL_PACKET_HDR 64
 130         u32 data_len = NULL_PACKET_HDR;
 131         struct sk_buff *skb;
 132         int ret;
 133         struct mwifiex_txinfo *tx_info = NULL;
 134
 135         if (adapter->surprise_removed)
 136                 return -1;
 137
 138         if (!priv->media_connected)
 139                 return -1;
 140
 141         if (adapter->data_sent)
 142                 return -1;
 143
 144         skb = dev_alloc_skb(data_len);
 145         if (!skb)
 146                 return -1;
 147
 148         tx_info = MWIFIEX_SKB_TXCB(skb);
 149         tx_info->bss_num = priv->bss_num;
 150         tx_info->bss_type = priv->bss_type;
 151         skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
 152         skb_push(skb, sizeof(struct txpd));
 153
 154         local_tx_pd = (struct txpd *) skb->data;
 155         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 156         local_tx_pd->flags = flags;
 157         local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
 158         local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
 159         local_tx_pd->bss_num = priv->bss_num;
 160         local_tx_pd->bss_type = priv->bss_type;
 161
 162         if (adapter->iface_type == MWIFIEX_USB) {
 163                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
 164                                                    skb, NULL);
 165         } else {
 166                 skb_push(skb, INTF_HEADER_LEN);
 167                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 168                                                    skb, NULL);
 169         }
 170         switch (ret) {
 171         case -EBUSY:
 172                 adapter->data_sent = true;
 173                 /* Fall through FAILURE handling */
 174         case -1:
 175                 dev_kfree_skb_any(skb);
 176                 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
 177                         __func__, ret);
 178                 adapter->dbg.num_tx_host_to_card_failure++;
 179                 break;
 180         case 0:
 181                 dev_kfree_skb_any(skb);
 182                 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
 183                         __func__);
 184                 adapter->tx_lock_flag = true;
 185                 break;
 186         case -EINPROGRESS:
 187                 break;
 188         default:
 189                 break;
 190         }
 191
 192         return ret;
 193 }
 194
 195 /*
 196  * This function checks if we need to send last packet indication.
 197  */
 198 u8
 199 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
 200 {
 201         struct mwifiex_adapter *adapter = priv->adapter;
 202         u8 ret = false;
 203
 204         if (!adapter->sleep_period.period)
 205                 return ret;
 206         if (mwifiex_wmm_lists_empty(adapter))
 207                         ret = true;
 208
 209         if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
 210             !is_command_pending(adapter)) {
 211                 adapter->delay_null_pkt = false;
 212                 ret = true;
 213         } else {
 214                 ret = false;
 215                 adapter->delay_null_pkt = true;
 216         }
 217         return ret;
 218 }