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                 local_tx_pd->tx_token_id = tx_info->ack_frame_id;
  82                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
  83         }
  84
  85         if (local_tx_pd->priority <
  86             ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
  87                 /*
  88                  * Set the priority specific tx_control field, setting of 0 will
  89                  *   cause the default value to be used later in this function
  90                  */
  91                 local_tx_pd->tx_control =
  92                         cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
  93                                                                    priority]);
  94
  95         if (adapter->pps_uapsd_mode) {
  96                 if (mwifiex_check_last_packet_indication(priv)) {
  97                         adapter->tx_lock_flag = true;
  98                         local_tx_pd->flags =
  99                                 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
 100                 }
 101         }
 102
 103         if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
 104                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
 105
 106         /* Offset of actual data */
 107         pkt_offset = sizeof(struct txpd) + pad;
 108         if (pkt_type == PKT_TYPE_MGMT) {
 109                 /* Set the packet type and add header for management frame */
 110                 local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
 111                 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 112         }
 113
 114         local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
 115
 116         /* make space for INTF_HEADER_LEN */
 117         skb_push(skb, INTF_HEADER_LEN);
 118
 119         if (!local_tx_pd->tx_control)
 120                 /* TxCtrl set by user or default */
 121                 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 122
 123         return skb->data;
 124 }
 125
 126 /*
 127  * This function tells firmware to send a NULL data packet.
 128  *
 129  * The function creates a NULL data packet with TxPD and sends to the
 130  * firmware for transmission, with highest priority setting.
 131  */
 132 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
 133 {
 134         struct mwifiex_adapter *adapter = priv->adapter;
 135         struct txpd *local_tx_pd;
 136         struct mwifiex_tx_param tx_param;
 137 /* sizeof(struct txpd) + Interface specific header */
 138 #define NULL_PACKET_HDR 64
 139         u32 data_len = NULL_PACKET_HDR;
 140         struct sk_buff *skb;
 141         int ret;
 142         struct mwifiex_txinfo *tx_info = NULL;
 143
 144         if (adapter->surprise_removed)
 145                 return -1;
 146
 147         if (!priv->media_connected)
 148                 return -1;
 149
 150         if (adapter->data_sent)
 151                 return -1;
 152
 153         skb = dev_alloc_skb(data_len);
 154         if (!skb)
 155                 return -1;
 156
 157         tx_info = MWIFIEX_SKB_TXCB(skb);
 158         memset(tx_info, 0, sizeof(*tx_info));
 159         tx_info->bss_num = priv->bss_num;
 160         tx_info->bss_type = priv->bss_type;
 161         tx_info->pkt_len = data_len - (sizeof(struct txpd) + INTF_HEADER_LEN);
 162         skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
 163         skb_push(skb, sizeof(struct txpd));
 164
 165         local_tx_pd = (struct txpd *) skb->data;
 166         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 167         local_tx_pd->flags = flags;
 168         local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
 169         local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
 170         local_tx_pd->bss_num = priv->bss_num;
 171         local_tx_pd->bss_type = priv->bss_type;
 172
 173         if (adapter->iface_type == MWIFIEX_USB) {
 174                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
 175                                                    skb, NULL);
 176         } else {
 177                 skb_push(skb, INTF_HEADER_LEN);
 178                 tx_param.next_pkt_len = 0;
 179                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 180                                                    skb, &tx_param);
 181         }
 182         switch (ret) {
 183         case -EBUSY:
 184                 adapter->data_sent = true;
 185                 /* Fall through FAILURE handling */
 186         case -1:
 187                 dev_kfree_skb_any(skb);
 188                 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
 189                         __func__, ret);
 190                 adapter->dbg.num_tx_host_to_card_failure++;
 191                 break;
 192         case 0:
 193                 dev_kfree_skb_any(skb);
 194                 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
 195                         __func__);
 196                 adapter->tx_lock_flag = true;
 197                 break;
 198         case -EINPROGRESS:
 199                 break;
 200         default:
 201                 break;
 202         }
 203
 204         return ret;
 205 }
 206
 207 /*
 208  * This function checks if we need to send last packet indication.
 209  */
 210 u8
 211 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
 212 {
 213         struct mwifiex_adapter *adapter = priv->adapter;
 214         u8 ret = false;
 215
 216         if (!adapter->sleep_period.period)
 217                 return ret;
 218         if (mwifiex_wmm_lists_empty(adapter))
 219                         ret = true;
 220
 221         if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
 222             !is_command_pending(adapter)) {
 223                 adapter->delay_null_pkt = false;
 224                 ret = true;
 225         } else {
 226                 ret = false;
 227                 adapter->delay_null_pkt = true;
 228         }
 229         return ret;
 230 }