drivers/net/wireless/marvell/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         unsigned int pad;
  51         u16 pkt_type, pkt_offset;
  52         int hroom = adapter->intf_hdr_len;
  53
  54         if (!skb->len) {
  55                 mwifiex_dbg(adapter, ERROR,
  56                             "Tx: bad packet length: %d\n", skb->len);
  57                 tx_info->status_code = -1;
  58                 return skb->data;
  59         }
  60
  61         BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
  62
  63         pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
  64
  65         pad = ((void *)skb->data - (sizeof(*local_tx_pd) + hroom)-
  66                          NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
  67         skb_push(skb, sizeof(*local_tx_pd) + pad);
  68
  69         local_tx_pd = (struct txpd *) skb->data;
  70         memset(local_tx_pd, 0, sizeof(struct txpd));
  71         local_tx_pd->bss_num = priv->bss_num;
  72         local_tx_pd->bss_type = priv->bss_type;
  73         local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
  74                                                        (sizeof(struct txpd) +
  75                                                         pad)));
  76
  77         local_tx_pd->priority = (u8) skb->priority;
  78         local_tx_pd->pkt_delay_2ms =
  79                                 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
  80
  81         if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
  82             tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
  83                 local_tx_pd->tx_token_id = tx_info->ack_frame_id;
  84                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
  85         }
  86
  87         if (local_tx_pd->priority <
  88             ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
  89                 /*
  90                  * Set the priority specific tx_control field, setting of 0 will
  91                  *   cause the default value to be used later in this function
  92                  */
  93                 local_tx_pd->tx_control =
  94                         cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
  95                                                                    priority]);
  96
  97         if (adapter->pps_uapsd_mode) {
  98                 if (mwifiex_check_last_packet_indication(priv)) {
  99                         adapter->tx_lock_flag = true;
 100                         local_tx_pd->flags =
 101                                 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
 102                 }
 103         }
 104
 105         if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
 106                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
 107
 108         /* Offset of actual data */
 109         pkt_offset = sizeof(struct txpd) + pad;
 110         if (pkt_type == PKT_TYPE_MGMT) {
 111                 /* Set the packet type and add header for management frame */
 112                 local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
 113                 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 114         }
 115
 116         local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
 117
 118         /* make space for adapter->intf_hdr_len */
 119         skb_push(skb, hroom);
 120
 121         if (!local_tx_pd->tx_control)
 122                 /* TxCtrl set by user or default */
 123                 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 124
 125         return skb->data;
 126 }
 127
 128 /*
 129  * This function tells firmware to send a NULL data packet.
 130  *
 131  * The function creates a NULL data packet with TxPD and sends to the
 132  * firmware for transmission, with highest priority setting.
 133  */
 134 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
 135 {
 136         struct mwifiex_adapter *adapter = priv->adapter;
 137         struct txpd *local_tx_pd;
 138         struct mwifiex_tx_param tx_param;
 139 /* sizeof(struct txpd) + Interface specific header */
 140 #define NULL_PACKET_HDR 64
 141         u32 data_len = NULL_PACKET_HDR;
 142         struct sk_buff *skb;
 143         int ret;
 144         struct mwifiex_txinfo *tx_info = NULL;
 145
 146         if (adapter->surprise_removed)
 147                 return -1;
 148
 149         if (!priv->media_connected)
 150                 return -1;
 151
 152         if (adapter->data_sent)
 153                 return -1;
 154
 155         if (adapter->if_ops.is_port_ready &&
 156             !adapter->if_ops.is_port_ready(priv))
 157                 return -1;
 158
 159         skb = dev_alloc_skb(data_len);
 160         if (!skb)
 161                 return -1;
 162
 163         tx_info = MWIFIEX_SKB_TXCB(skb);
 164         memset(tx_info, 0, sizeof(*tx_info));
 165         tx_info->bss_num = priv->bss_num;
 166         tx_info->bss_type = priv->bss_type;
 167         tx_info->pkt_len = data_len -
 168                         (sizeof(struct txpd) + adapter->intf_hdr_len);
 169         skb_reserve(skb, sizeof(struct txpd) + adapter->intf_hdr_len);
 170         skb_push(skb, sizeof(struct txpd));
 171
 172         local_tx_pd = (struct txpd *) skb->data;
 173         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 174         local_tx_pd->flags = flags;
 175         local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
 176         local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
 177         local_tx_pd->bss_num = priv->bss_num;
 178         local_tx_pd->bss_type = priv->bss_type;
 179
 180         skb_push(skb, adapter->intf_hdr_len);
 181         if (adapter->iface_type == MWIFIEX_USB) {
 182                 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
 183                                                    skb, NULL);
 184         } else {
 185                 tx_param.next_pkt_len = 0;
 186                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 187                                                    skb, &tx_param);
 188         }
 189         switch (ret) {
 190         case -EBUSY:
 191                 dev_kfree_skb_any(skb);
 192                 mwifiex_dbg(adapter, ERROR,
 193                             "%s: host_to_card failed: ret=%d\n",
 194                             __func__, ret);
 195                 adapter->dbg.num_tx_host_to_card_failure++;
 196                 break;
 197         case -1:
 198                 dev_kfree_skb_any(skb);
 199                 mwifiex_dbg(adapter, ERROR,
 200                             "%s: host_to_card failed: ret=%d\n",
 201                             __func__, ret);
 202                 adapter->dbg.num_tx_host_to_card_failure++;
 203                 break;
 204         case 0:
 205                 dev_kfree_skb_any(skb);
 206                 mwifiex_dbg(adapter, DATA,
 207                             "data: %s: host_to_card succeeded\n",
 208                             __func__);
 209                 adapter->tx_lock_flag = true;
 210                 break;
 211         case -EINPROGRESS:
 212                 adapter->tx_lock_flag = true;
 213                 break;
 214         default:
 215                 break;
 216         }
 217
 218         return ret;
 219 }
 220
 221 /*
 222  * This function checks if we need to send last packet indication.
 223  */
 224 u8
 225 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
 226 {
 227         struct mwifiex_adapter *adapter = priv->adapter;
 228         u8 ret = false;
 229
 230         if (!adapter->sleep_period.period)
 231                 return ret;
 232         if (mwifiex_wmm_lists_empty(adapter))
 233                         ret = true;
 234
 235         if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
 236             !is_command_pending(adapter)) {
 237                 adapter->delay_null_pkt = false;
 238                 ret = true;
 239         } else {
 240                 ret = false;
 241                 adapter->delay_null_pkt = true;
 242         }
 243         return ret;
 244 }