drivers/net/wireless/rsi/rsi_91x_pkt.c

   1 /**
   2  * Copyright (c) 2014 Redpine Signals Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "rsi_mgmt.h"
  18
  19 /**
  20  * rsi_send_data_pkt() - This function sends the recieved data packet from
  21  *                       driver to device.
  22  * @common: Pointer to the driver private structure.
  23  * @skb: Pointer to the socket buffer structure.
  24  *
  25  * Return: status: 0 on success, -1 on failure.
  26  */
  27 int rsi_send_data_pkt(struct rsi_common *common, struct sk_buff *skb)
  28 {
  29         struct rsi_hw *adapter = common->priv;
  30         struct ieee80211_hdr *tmp_hdr;
  31         struct ieee80211_tx_info *info;
  32         struct skb_info *tx_params;
  33         struct ieee80211_bss_conf *bss;
  34         int status;
  35         u8 ieee80211_size = MIN_802_11_HDR_LEN;
  36         u8 extnd_size;
  37         __le16 *frame_desc;
  38         u16 seq_num;
  39
  40         info = IEEE80211_SKB_CB(skb);
  41         bss = &info->control.vif->bss_conf;
  42         tx_params = (struct skb_info *)info->driver_data;
  43
  44         if (!bss->assoc) {
  45                 status = -EINVAL;
  46                 goto err;
  47         }
  48
  49         tmp_hdr = (struct ieee80211_hdr *)&skb->data[0];
  50         seq_num = (le16_to_cpu(tmp_hdr->seq_ctrl) >> 4);
  51
  52         extnd_size = ((uintptr_t)skb->data & 0x3);
  53
  54         if ((FRAME_DESC_SZ + extnd_size) > skb_headroom(skb)) {
  55                 rsi_dbg(ERR_ZONE, "%s: Unable to send pkt\n", __func__);
  56                 status = -ENOSPC;
  57                 goto err;
  58         }
  59
  60         skb_push(skb, (FRAME_DESC_SZ + extnd_size));
  61         frame_desc = (__le16 *)&skb->data[0];
  62         memset((u8 *)frame_desc, 0, FRAME_DESC_SZ);
  63
  64         if (ieee80211_is_data_qos(tmp_hdr->frame_control)) {
  65                 ieee80211_size += 2;
  66                 frame_desc[6] |= cpu_to_le16(BIT(12));
  67         }
  68
  69         if ((!(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) &&
  70             (common->secinfo.security_enable)) {
  71                 if (rsi_is_cipher_wep(common))
  72                         ieee80211_size += 4;
  73                 else
  74                         ieee80211_size += 8;
  75                 frame_desc[6] |= cpu_to_le16(BIT(15));
  76         }
  77
  78         frame_desc[0] = cpu_to_le16((skb->len - FRAME_DESC_SZ) |
  79                                     (RSI_WIFI_DATA_Q << 12));
  80         frame_desc[2] = cpu_to_le16((extnd_size) | (ieee80211_size) << 8);
  81
  82         if (common->min_rate != 0xffff) {
  83                 /* Send fixed rate */
  84                 frame_desc[3] = cpu_to_le16(RATE_INFO_ENABLE);
  85                 frame_desc[4] = cpu_to_le16(common->min_rate);
  86
  87                 if (conf_is_ht40(&common->priv->hw->conf))
  88                         frame_desc[5] = cpu_to_le16(FULL40M_ENABLE);
  89
  90                 if (common->vif_info[0].sgi) {
  91                         if (common->min_rate & 0x100) /* Only MCS rates */
  92                                 frame_desc[4] |=
  93                                         cpu_to_le16(ENABLE_SHORTGI_RATE);
  94                 }
  95
  96         }
  97
  98         frame_desc[6] |= cpu_to_le16(seq_num & 0xfff);
  99         frame_desc[7] = cpu_to_le16(((tx_params->tid & 0xf) << 4) |
 100                                     (skb->priority & 0xf) |
 101                                     (tx_params->sta_id << 8));
 102
 103         status = adapter->host_intf_write_pkt(common->priv,
 104                                               skb->data,
 105                                               skb->len);
 106         if (status)
 107                 rsi_dbg(ERR_ZONE, "%s: Failed to write pkt\n",
 108                         __func__);
 109
 110 err:
 111         ++common->tx_stats.total_tx_pkt_freed[skb->priority];
 112         rsi_indicate_tx_status(common->priv, skb, status);
 113         return status;
 114 }
 115
 116 /**
 117  * rsi_send_mgmt_pkt() - This functions sends the received management packet
 118  *                       from driver to device.
 119  * @common: Pointer to the driver private structure.
 120  * @skb: Pointer to the socket buffer structure.
 121  *
 122  * Return: status: 0 on success, -1 on failure.
 123  */
 124 int rsi_send_mgmt_pkt(struct rsi_common *common,
 125                       struct sk_buff *skb)
 126 {
 127         struct rsi_hw *adapter = common->priv;
 128         struct ieee80211_hdr *wh;
 129         struct ieee80211_tx_info *info;
 130         struct ieee80211_bss_conf *bss;
 131         struct ieee80211_hw *hw = adapter->hw;
 132         struct ieee80211_conf *conf = &hw->conf;
 133         struct skb_info *tx_params;
 134         int status = -E2BIG;
 135         __le16 *msg;
 136         u8 extnd_size;
 137         u8 vap_id = 0;
 138
 139         info = IEEE80211_SKB_CB(skb);
 140         tx_params = (struct skb_info *)info->driver_data;
 141         extnd_size = ((uintptr_t)skb->data & 0x3);
 142
 143         if (tx_params->flags & INTERNAL_MGMT_PKT) {
 144                 if ((extnd_size) > skb_headroom(skb)) {
 145                         rsi_dbg(ERR_ZONE, "%s: Unable to send pkt\n", __func__);
 146                         dev_kfree_skb(skb);
 147                         return -ENOSPC;
 148                 }
 149                 skb_push(skb, extnd_size);
 150                 skb->data[extnd_size + 4] = extnd_size;
 151                 status = adapter->host_intf_write_pkt(common->priv,
 152                                                       (u8 *)skb->data,
 153                                                       skb->len);
 154                 if (status) {
 155                         rsi_dbg(ERR_ZONE,
 156                                 "%s: Failed to write the packet\n", __func__);
 157                 }
 158                 dev_kfree_skb(skb);
 159                 return status;
 160         }
 161
 162         bss = &info->control.vif->bss_conf;
 163         wh = (struct ieee80211_hdr *)&skb->data[0];
 164
 165         if (FRAME_DESC_SZ > skb_headroom(skb))
 166                 goto err;
 167
 168         skb_push(skb, FRAME_DESC_SZ);
 169         memset(skb->data, 0, FRAME_DESC_SZ);
 170         msg = (__le16 *)skb->data;
 171
 172         if (skb->len > MAX_MGMT_PKT_SIZE) {
 173                 rsi_dbg(INFO_ZONE, "%s: Dropping mgmt pkt > 512\n", __func__);
 174                 goto err;
 175         }
 176
 177         msg[0] = cpu_to_le16((skb->len - FRAME_DESC_SZ) |
 178                             (RSI_WIFI_MGMT_Q << 12));
 179         msg[1] = cpu_to_le16(TX_DOT11_MGMT);
 180         msg[2] = cpu_to_le16(MIN_802_11_HDR_LEN << 8);
 181         msg[3] = cpu_to_le16(RATE_INFO_ENABLE);
 182         msg[6] = cpu_to_le16(le16_to_cpu(wh->seq_ctrl) >> 4);
 183
 184         if (wh->addr1[0] & BIT(0))
 185                 msg[3] |= cpu_to_le16(RSI_BROADCAST_PKT);
 186
 187         if (common->band == NL80211_BAND_2GHZ)
 188                 msg[4] = cpu_to_le16(RSI_11B_MODE);
 189         else
 190                 msg[4] = cpu_to_le16((RSI_RATE_6 & 0x0f) | RSI_11G_MODE);
 191
 192         if (conf_is_ht40(conf)) {
 193                 msg[4] = cpu_to_le16(0xB | RSI_11G_MODE);
 194                 msg[5] = cpu_to_le16(0x6);
 195         }
 196
 197         /* Indicate to firmware to give cfm */
 198         if ((skb->data[16] == IEEE80211_STYPE_PROBE_REQ) && (!bss->assoc)) {
 199                 msg[1] |= cpu_to_le16(BIT(10));
 200                 msg[7] = cpu_to_le16(PROBEREQ_CONFIRM);
 201                 common->mgmt_q_block = true;
 202         }
 203
 204         msg[7] |= cpu_to_le16(vap_id << 8);
 205
 206         status = adapter->host_intf_write_pkt(common->priv,
 207                                               (u8 *)msg,
 208                                               skb->len);
 209         if (status)
 210                 rsi_dbg(ERR_ZONE, "%s: Failed to write the packet\n", __func__);
 211
 212 err:
 213         rsi_indicate_tx_status(common->priv, skb, status);
 214         return status;
 215 }