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
  52         if (!skb->len) {
  53                 dev_err(adapter->dev, "Tx: bad packet length: %d\n",
  54                        skb->len);
  55                 tx_info->status_code = -1;
  56                 return skb->data;
  57         }
  58
  59         /* If skb->data is not aligned; add padding */
  60         pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
  61
  62         BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
  63                                                                 + pad));
  64         skb_push(skb, sizeof(*local_tx_pd) + pad);
  65
  66         local_tx_pd = (struct txpd *) skb->data;
  67         memset(local_tx_pd, 0, sizeof(struct txpd));
  68         local_tx_pd->bss_num = priv->bss_num;
  69         local_tx_pd->bss_type = priv->bss_type;
  70         local_tx_pd->tx_pkt_length = cpu_to_le16((u16) (skb->len -
  71                                                 (sizeof(struct txpd) + 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  */
 114 int 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_index = priv->bss_index;
 140         skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
 141         skb_push(skb, sizeof(struct txpd));
 142
 143         local_tx_pd = (struct txpd *) skb->data;
 144         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
 145         local_tx_pd->flags = flags;
 146         local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
 147         local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
 148         local_tx_pd->bss_num = priv->bss_num;
 149         local_tx_pd->bss_type = priv->bss_type;
 150
 151         skb_push(skb, INTF_HEADER_LEN);
 152
 153         ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
 154                                              skb->data, skb->len, NULL);
 155         switch (ret) {
 156         case -EBUSY:
 157                 adapter->data_sent = true;
 158                 /* Fall through FAILURE handling */
 159         case -1:
 160                 dev_kfree_skb_any(skb);
 161                 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
 162                                                 __func__, ret);
 163                 adapter->dbg.num_tx_host_to_card_failure++;
 164                 break;
 165         case 0:
 166                 dev_kfree_skb_any(skb);
 167                 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
 168                                                 __func__);
 169                 adapter->tx_lock_flag = true;
 170                 break;
 171         case -EINPROGRESS:
 172                 break;
 173         default:
 174                 break;
 175         }
 176
 177         return ret;
 178 }
 179
 180 /*
 181  * This function checks if we need to send last packet indication.
 182  */
 183 u8
 184 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
 185 {
 186         struct mwifiex_adapter *adapter = priv->adapter;
 187         u8 ret = false;
 188
 189         if (!adapter->sleep_period.period)
 190                 return ret;
 191         if (mwifiex_wmm_lists_empty(adapter))
 192                         ret = true;
 193
 194         if (ret && !adapter->cmd_sent && !adapter->curr_cmd
 195             && !is_command_pending(adapter)) {
 196                 adapter->delay_null_pkt = false;
 197                 ret = true;
 198         } else {
 199                 ret = false;
 200                 adapter->delay_null_pkt = true;
 201         }
 202         return ret;
 203 }