drivers/net/wireless/mwifiex/11h.c

   1 /*
   2  * Marvell Wireless LAN device driver: 802.11h
   3  *
   4  * Copyright (C) 2013-2014, 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 "main.h"
  21 #include "fw.h"
  22
  23
  24 /* This function appends 11h info to a buffer while joining an
  25  * infrastructure BSS
  26  */
  27 static void
  28 mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer,
  29                                struct mwifiex_bssdescriptor *bss_desc)
  30 {
  31         struct mwifiex_ie_types_header *ie_header;
  32         struct mwifiex_ie_types_pwr_capability *cap;
  33         struct mwifiex_ie_types_local_pwr_constraint *constraint;
  34         struct ieee80211_supported_band *sband;
  35         u8 radio_type;
  36         int i;
  37
  38         if (!buffer || !(*buffer))
  39                 return;
  40
  41         radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band);
  42         sband = priv->wdev.wiphy->bands[radio_type];
  43
  44         cap = (struct mwifiex_ie_types_pwr_capability *)*buffer;
  45         cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY);
  46         cap->header.len = cpu_to_le16(2);
  47         cap->min_pwr = 0;
  48         cap->max_pwr = 0;
  49         *buffer += sizeof(*cap);
  50
  51         constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer;
  52         constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT);
  53         constraint->header.len = cpu_to_le16(2);
  54         constraint->chan = bss_desc->channel;
  55         constraint->constraint = bss_desc->local_constraint;
  56         *buffer += sizeof(*constraint);
  57
  58         ie_header = (struct mwifiex_ie_types_header *)*buffer;
  59         ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH);
  60         ie_header->len  = cpu_to_le16(2 * sband->n_channels + 2);
  61         *buffer += sizeof(*ie_header);
  62         *(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS;
  63         *(*buffer)++ = 2 * sband->n_channels;
  64         for (i = 0; i < sband->n_channels; i++) {
  65                 *(*buffer)++ = ieee80211_frequency_to_channel(
  66                                         sband->channels[i].center_freq);
  67                 *(*buffer)++ = 1; /* one channel in the subband */
  68         }
  69 }
  70
  71 /* Enable or disable the 11h extensions in the firmware */
  72 static int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag)
  73 {
  74         u32 enable = flag;
  75
  76         return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
  77                                 HostCmd_ACT_GEN_SET, DOT11H_I, &enable, true);
  78 }
  79
  80 /* This functions processes TLV buffer for a pending BSS Join command.
  81  *
  82  * Activate 11h functionality in the firmware if the spectrum management
  83  * capability bit is found in the network we are joining. Also, necessary
  84  * TLVs are set based on requested network's 11h capability.
  85  */
  86 void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer,
  87                               struct mwifiex_bssdescriptor *bss_desc)
  88 {
  89         if (bss_desc->sensed_11h) {
  90                 /* Activate 11h functions in firmware, turns on capability
  91                  * bit
  92                  */
  93                 mwifiex_11h_activate(priv, true);
  94                 bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT;
  95                 mwifiex_11h_process_infra_join(priv, buffer, bss_desc);
  96         } else {
  97                 /* Deactivate 11h functions in the firmware */
  98                 mwifiex_11h_activate(priv, false);
  99                 bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT;
 100         }
 101 }
 102
 103 /* This is DFS CAC work queue function.
 104  * This delayed work emits CAC finished event for cfg80211 if
 105  * CAC was started earlier.
 106  */
 107 void mwifiex_dfs_cac_work_queue(struct work_struct *work)
 108 {
 109         struct cfg80211_chan_def chandef;
 110         struct delayed_work *delayed_work =
 111                         container_of(work, struct delayed_work, work);
 112         struct mwifiex_private *priv =
 113                         container_of(delayed_work, struct mwifiex_private,
 114                                      dfs_cac_work);
 115
 116         if (WARN_ON(!priv))
 117                 return;
 118
 119         chandef = priv->dfs_chandef;
 120         if (priv->wdev.cac_started) {
 121                 dev_dbg(priv->adapter->dev,
 122                         "CAC timer finished; No radar detected\n");
 123                 cfg80211_cac_event(priv->netdev, &chandef,
 124                                    NL80211_RADAR_CAC_FINISHED,
 125                                    GFP_KERNEL);
 126         }
 127 }
 128
 129 /* This function prepares channel report request command to FW for
 130  * starting radar detection.
 131  */
 132 int mwifiex_cmd_issue_chan_report_request(struct mwifiex_private *priv,
 133                                           struct host_cmd_ds_command *cmd,
 134                                           void *data_buf)
 135 {
 136         struct host_cmd_ds_chan_rpt_req *cr_req = &cmd->params.chan_rpt_req;
 137         struct mwifiex_radar_params *radar_params = (void *)data_buf;
 138
 139         cmd->command = cpu_to_le16(HostCmd_CMD_CHAN_REPORT_REQUEST);
 140         cmd->size = cpu_to_le16(S_DS_GEN);
 141         le16_add_cpu(&cmd->size, sizeof(struct host_cmd_ds_chan_rpt_req));
 142
 143         cr_req->chan_desc.start_freq = cpu_to_le16(MWIFIEX_A_BAND_START_FREQ);
 144         cr_req->chan_desc.chan_num = radar_params->chandef->chan->hw_value;
 145         cr_req->chan_desc.chan_width = radar_params->chandef->width;
 146         cr_req->msec_dwell_time = cpu_to_le32(radar_params->cac_time_ms);
 147
 148         dev_dbg(priv->adapter->dev,
 149                 "11h: issuing DFS Radar check for channel=%d\n",
 150                 radar_params->chandef->chan->hw_value);
 151
 152         return 0;
 153 }
 154
 155 /* This function is to abort ongoing CAC upon stopping AP operations
 156  * or during unload.
 157  */
 158 void mwifiex_abort_cac(struct mwifiex_private *priv)
 159 {
 160         if (priv->wdev.cac_started) {
 161                 dev_dbg(priv->adapter->dev,
 162                         "Aborting delayed work for CAC.\n");
 163                 cancel_delayed_work_sync(&priv->dfs_cac_work);
 164                 cfg80211_cac_event(priv->netdev, &priv->dfs_chandef,
 165                                    NL80211_RADAR_CAC_ABORTED, GFP_KERNEL);
 166         }
 167 }
 168
 169 /* This function handles channel report event from FW during CAC period.
 170  * If radar is detected during CAC, driver indicates the same to cfg80211
 171  * and also cancels ongoing delayed work.
 172  */
 173 int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv,
 174                                      struct sk_buff *skb)
 175 {
 176         struct host_cmd_ds_chan_rpt_event *rpt_event;
 177         struct mwifiex_ie_types_chan_rpt_data *rpt;
 178         u8 *evt_buf;
 179         u16 event_len, tlv_len;
 180
 181         rpt_event = (void *)(skb->data + sizeof(u32));
 182         event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+
 183                                 sizeof(u32));
 184
 185         if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) {
 186                 dev_err(priv->adapter->dev, "Error in channel report event\n");
 187                 return -1;
 188         }
 189
 190         evt_buf = (void *)&rpt_event->tlvbuf;
 191
 192         while (event_len >= sizeof(struct mwifiex_ie_types_header)) {
 193                 rpt = (void *)&rpt_event->tlvbuf;
 194                 tlv_len = le16_to_cpu(rpt->header.len);
 195
 196                 switch (le16_to_cpu(rpt->header.type)) {
 197                 case TLV_TYPE_CHANRPT_11H_BASIC:
 198                         if (rpt->map.radar) {
 199                                 dev_notice(priv->adapter->dev,
 200                                            "RADAR Detected on channel %d!\n",
 201                                             priv->dfs_chandef.chan->hw_value);
 202                                 cancel_delayed_work_sync(&priv->dfs_cac_work);
 203                                 cfg80211_cac_event(priv->netdev,
 204                                                    &priv->dfs_chandef,
 205                                                    NL80211_RADAR_DETECTED,
 206                                                    GFP_KERNEL);
 207                         }
 208                         break;
 209                 default:
 210                         break;
 211                 }
 212
 213                 evt_buf += (tlv_len + sizeof(rpt->header));
 214                 event_len -= (tlv_len + sizeof(rpt->header));
 215         }
 216
 217         return 0;
 218 }