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 = NULL;
  31         struct ieee80211_tx_info *info;
  32         struct skb_info *tx_params;
  33         struct ieee80211_bss_conf *bss = NULL;
  34         int status = -EINVAL;
  35         u8 ieee80211_size = MIN_802_11_HDR_LEN;
  36         u8 extnd_size = 0;
  37         __le16 *frame_desc;
  38         u16 seq_num = 0;
  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                 goto err;
  46
  47         tmp_hdr = (struct ieee80211_hdr *)&skb->data[0];
  48         seq_num = (le16_to_cpu(tmp_hdr->seq_ctrl) >> 4);
  49
  50         extnd_size = ((uintptr_t)skb->data & 0x3);
  51
  52         if ((FRAME_DESC_SZ + extnd_size) > skb_headroom(skb)) {
  53                 rsi_dbg(ERR_ZONE, "%s: Unable to send pkt\n", __func__);
  54                 status = -ENOSPC;
  55                 goto err;
  56         }
  57
  58         skb_push(skb, (FRAME_DESC_SZ + extnd_size));
  59         frame_desc = (__le16 *)&skb->data[0];
  60         memset((u8 *)frame_desc, 0, FRAME_DESC_SZ);
  61
  62         if (ieee80211_is_data_qos(tmp_hdr->frame_control)) {
  63                 ieee80211_size += 2;
  64                 frame_desc[6] |= cpu_to_le16(BIT(12));
  65         }
  66
  67         if ((!(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) &&
  68             (common->secinfo.security_enable)) {
  69                 if (rsi_is_cipher_wep(common))
  70                         ieee80211_size += 4;
  71                 else
  72                         ieee80211_size += 8;
  73                 frame_desc[6] |= cpu_to_le16(BIT(15));
  74         }
  75
  76         frame_desc[0] = cpu_to_le16((skb->len - FRAME_DESC_SZ) |
  77                                     (RSI_WIFI_DATA_Q << 12));
  78         frame_desc[2] = cpu_to_le16((extnd_size) | (ieee80211_size) << 8);
  79
  80         if (common->min_rate != 0xffff) {
  81                 /* Send fixed rate */
  82                 frame_desc[3] = cpu_to_le16(RATE_INFO_ENABLE);
  83                 frame_desc[4] = cpu_to_le16(common->min_rate);
  84         }
  85
  86         frame_desc[6] |= cpu_to_le16(seq_num & 0xfff);
  87         frame_desc[7] = cpu_to_le16(((tx_params->tid & 0xf) << 4) |
  88                                     (skb->priority & 0xf) |
  89                                     (tx_params->sta_id << 8));
  90
  91         status = adapter->host_intf_write_pkt(common->priv,
  92                                               skb->data,
  93                                               skb->len);
  94         if (status)
  95                 rsi_dbg(ERR_ZONE, "%s: Failed to write pkt\n",
  96                         __func__);
  97
  98 err:
  99         ++common->tx_stats.total_tx_pkt_freed[skb->priority];
 100         rsi_indicate_tx_status(common->priv, skb, status);
 101         return status;
 102 }
 103
 104 /**
 105  * rsi_send_mgmt_pkt() - This functions sends the received management packet
 106  *                       from driver to device.
 107  * @common: Pointer to the driver private structure.
 108  * @skb: Pointer to the socket buffer structure.
 109  *
 110  * Return: status: 0 on success, -1 on failure.
 111  */
 112 int rsi_send_mgmt_pkt(struct rsi_common *common,
 113                       struct sk_buff *skb)
 114 {
 115         struct rsi_hw *adapter = common->priv;
 116         struct ieee80211_hdr *wh = NULL;
 117         struct ieee80211_tx_info *info;
 118         struct ieee80211_bss_conf *bss = NULL;
 119         struct skb_info *tx_params;
 120         int status = -E2BIG;
 121         __le16 *msg = NULL;
 122         u8 extnd_size = 0;
 123         u8 vap_id = 0;
 124
 125         info = IEEE80211_SKB_CB(skb);
 126         tx_params = (struct skb_info *)info->driver_data;
 127         extnd_size = ((uintptr_t)skb->data & 0x3);
 128
 129         if (tx_params->flags & INTERNAL_MGMT_PKT) {
 130                 if ((extnd_size) > skb_headroom(skb)) {
 131                         rsi_dbg(ERR_ZONE, "%s: Unable to send pkt\n", __func__);
 132                         dev_kfree_skb(skb);
 133                         return -ENOSPC;
 134                 }
 135                 skb_push(skb, extnd_size);
 136                 skb->data[extnd_size + 4] = extnd_size;
 137                 status = adapter->host_intf_write_pkt(common->priv,
 138                                                       (u8 *)skb->data,
 139                                                       skb->len);
 140                 if (status) {
 141                         rsi_dbg(ERR_ZONE,
 142                                 "%s: Failed to write the packet\n", __func__);
 143                 }
 144                 dev_kfree_skb(skb);
 145                 return status;
 146         }
 147
 148         bss = &info->control.vif->bss_conf;
 149         wh = (struct ieee80211_hdr *)&skb->data[0];
 150
 151         if (FRAME_DESC_SZ > skb_headroom(skb))
 152                 goto err;
 153
 154         skb_push(skb, FRAME_DESC_SZ);
 155         memset(skb->data, 0, FRAME_DESC_SZ);
 156         msg = (__le16 *)skb->data;
 157
 158         if (skb->len > MAX_MGMT_PKT_SIZE) {
 159                 rsi_dbg(INFO_ZONE, "%s: Dropping mgmt pkt > 512\n", __func__);
 160                 goto err;
 161         }
 162
 163         msg[0] = cpu_to_le16((skb->len - FRAME_DESC_SZ) |
 164                             (RSI_WIFI_MGMT_Q << 12));
 165         msg[1] = cpu_to_le16(TX_DOT11_MGMT);
 166         msg[2] = cpu_to_le16(MIN_802_11_HDR_LEN << 8);
 167         msg[3] = cpu_to_le16(RATE_INFO_ENABLE);
 168         msg[6] = cpu_to_le16(le16_to_cpu(wh->seq_ctrl) >> 4);
 169
 170         if (wh->addr1[0] & BIT(0))
 171                 msg[3] |= cpu_to_le16(RSI_BROADCAST_PKT);
 172
 173         if (common->band == IEEE80211_BAND_2GHZ)
 174                 msg[4] = cpu_to_le16(RSI_11B_MODE);
 175         else
 176                 msg[4] = cpu_to_le16((RSI_RATE_6 & 0x0f) | RSI_11G_MODE);
 177
 178         /* Indicate to firmware to give cfm */
 179         if ((skb->data[16] == IEEE80211_STYPE_PROBE_REQ) && (!bss->assoc)) {
 180                 msg[1] |= cpu_to_le16(BIT(10));
 181                 msg[7] = cpu_to_le16(PROBEREQ_CONFIRM);
 182                 common->mgmt_q_block = true;
 183         }
 184
 185         msg[7] |= cpu_to_le16(vap_id << 8);
 186
 187         status = adapter->host_intf_write_pkt(common->priv,
 188                                               (u8 *)msg,
 189                                               skb->len);
 190         if (status)
 191                 rsi_dbg(ERR_ZONE, "%s: Failed to write the packet\n", __func__);
 192
 193 err:
 194         rsi_indicate_tx_status(common->priv, skb, status);
 195         return status;
 196 }