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 void mwifiex_init_11h_params(struct mwifiex_private *priv)
  25 {
  26         priv->state_11h.is_11h_enabled = true;
  27         priv->state_11h.is_11h_active = false;
  28 }
  29
  30 inline int mwifiex_is_11h_active(struct mwifiex_private *priv)
  31 {
  32         return priv->state_11h.is_11h_active;
  33 }
  34 /* This function appends 11h info to a buffer while joining an
  35  * infrastructure BSS
  36  */
  37 static void
  38 mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer,
  39                                struct mwifiex_bssdescriptor *bss_desc)
  40 {
  41         struct mwifiex_ie_types_header *ie_header;
  42         struct mwifiex_ie_types_pwr_capability *cap;
  43         struct mwifiex_ie_types_local_pwr_constraint *constraint;
  44         struct ieee80211_supported_band *sband;
  45         u8 radio_type;
  46         int i;
  47
  48         if (!buffer || !(*buffer))
  49                 return;
  50
  51         radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band);
  52         sband = priv->wdev.wiphy->bands[radio_type];
  53
  54         cap = (struct mwifiex_ie_types_pwr_capability *)*buffer;
  55         cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY);
  56         cap->header.len = cpu_to_le16(2);
  57         cap->min_pwr = 0;
  58         cap->max_pwr = 0;
  59         *buffer += sizeof(*cap);
  60
  61         constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer;
  62         constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT);
  63         constraint->header.len = cpu_to_le16(2);
  64         constraint->chan = bss_desc->channel;
  65         constraint->constraint = bss_desc->local_constraint;
  66         *buffer += sizeof(*constraint);
  67
  68         ie_header = (struct mwifiex_ie_types_header *)*buffer;
  69         ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH);
  70         ie_header->len  = cpu_to_le16(2 * sband->n_channels + 2);
  71         *buffer += sizeof(*ie_header);
  72         *(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS;
  73         *(*buffer)++ = 2 * sband->n_channels;
  74         for (i = 0; i < sband->n_channels; i++) {
  75                 *(*buffer)++ = ieee80211_frequency_to_channel(
  76                                         sband->channels[i].center_freq);
  77                 *(*buffer)++ = 1; /* one channel in the subband */
  78         }
  79 }
  80
  81 /* Enable or disable the 11h extensions in the firmware */
  82 int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag)
  83 {
  84         u32 enable = flag;
  85
  86         /* enable master mode radar detection on AP interface */
  87         if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) && enable)
  88                 enable |= MWIFIEX_MASTER_RADAR_DET_MASK;
  89
  90         return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
  91                                 HostCmd_ACT_GEN_SET, DOT11H_I, &enable, true);
  92 }
  93
  94 /* This functions processes TLV buffer for a pending BSS Join command.
  95  *
  96  * Activate 11h functionality in the firmware if the spectrum management
  97  * capability bit is found in the network we are joining. Also, necessary
  98  * TLVs are set based on requested network's 11h capability.
  99  */
 100 void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer,
 101                               struct mwifiex_bssdescriptor *bss_desc)
 102 {
 103         if (bss_desc->sensed_11h) {
 104                 /* Activate 11h functions in firmware, turns on capability
 105                  * bit
 106                  */
 107                 mwifiex_11h_activate(priv, true);
 108                 priv->state_11h.is_11h_active = true;
 109                 bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 110                 mwifiex_11h_process_infra_join(priv, buffer, bss_desc);
 111         } else {
 112                 /* Deactivate 11h functions in the firmware */
 113                 mwifiex_11h_activate(priv, false);
 114                 priv->state_11h.is_11h_active = false;
 115                 bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT;
 116         }
 117 }
 118
 119 /* This is DFS CAC work queue function.
 120  * This delayed work emits CAC finished event for cfg80211 if
 121  * CAC was started earlier.
 122  */
 123 void mwifiex_dfs_cac_work_queue(struct work_struct *work)
 124 {
 125         struct cfg80211_chan_def chandef;
 126         struct delayed_work *delayed_work =
 127                         container_of(work, struct delayed_work, work);
 128         struct mwifiex_private *priv =
 129                         container_of(delayed_work, struct mwifiex_private,
 130                                      dfs_cac_work);
 131
 132         if (WARN_ON(!priv))
 133                 return;
 134
 135         chandef = priv->dfs_chandef;
 136         if (priv->wdev.cac_started) {
 137                 mwifiex_dbg(priv->adapter, MSG,
 138                             "CAC timer finished; No radar detected\n");
 139                 cfg80211_cac_event(priv->netdev, &chandef,
 140                                    NL80211_RADAR_CAC_FINISHED,
 141                                    GFP_KERNEL);
 142         }
 143 }
 144
 145 /* This function prepares channel report request command to FW for
 146  * starting radar detection.
 147  */
 148 int mwifiex_cmd_issue_chan_report_request(struct mwifiex_private *priv,
 149                                           struct host_cmd_ds_command *cmd,
 150                                           void *data_buf)
 151 {
 152         struct host_cmd_ds_chan_rpt_req *cr_req = &cmd->params.chan_rpt_req;
 153         struct mwifiex_radar_params *radar_params = (void *)data_buf;
 154
 155         cmd->command = cpu_to_le16(HostCmd_CMD_CHAN_REPORT_REQUEST);
 156         cmd->size = cpu_to_le16(S_DS_GEN);
 157         le16_add_cpu(&cmd->size, sizeof(struct host_cmd_ds_chan_rpt_req));
 158
 159         cr_req->chan_desc.start_freq = cpu_to_le16(MWIFIEX_A_BAND_START_FREQ);
 160         cr_req->chan_desc.chan_num = radar_params->chandef->chan->hw_value;
 161         cr_req->chan_desc.chan_width = radar_params->chandef->width;
 162         cr_req->msec_dwell_time = cpu_to_le32(radar_params->cac_time_ms);
 163
 164         if (radar_params->cac_time_ms)
 165                 mwifiex_dbg(priv->adapter, MSG,
 166                             "11h: issuing DFS Radar check for channel=%d\n",
 167                             radar_params->chandef->chan->hw_value);
 168         else
 169                 mwifiex_dbg(priv->adapter, MSG, "cancelling CAC\n");
 170
 171         return 0;
 172 }
 173
 174 int mwifiex_stop_radar_detection(struct mwifiex_private *priv,
 175                                  struct cfg80211_chan_def *chandef)
 176 {
 177         struct mwifiex_radar_params radar_params;
 178
 179         memset(&radar_params, 0, sizeof(struct mwifiex_radar_params));
 180         radar_params.chandef = chandef;
 181         radar_params.cac_time_ms = 0;
 182
 183         return mwifiex_send_cmd(priv, HostCmd_CMD_CHAN_REPORT_REQUEST,
 184                                 HostCmd_ACT_GEN_SET, 0, &radar_params, true);
 185 }
 186
 187 /* This function is to abort ongoing CAC upon stopping AP operations
 188  * or during unload.
 189  */
 190 void mwifiex_abort_cac(struct mwifiex_private *priv)
 191 {
 192         if (priv->wdev.cac_started) {
 193                 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
 194                         mwifiex_dbg(priv->adapter, ERROR,
 195                                     "failed to stop CAC in FW\n");
 196                 mwifiex_dbg(priv->adapter, MSG,
 197                             "Aborting delayed work for CAC.\n");
 198                 cancel_delayed_work_sync(&priv->dfs_cac_work);
 199                 cfg80211_cac_event(priv->netdev, &priv->dfs_chandef,
 200                                    NL80211_RADAR_CAC_ABORTED, GFP_KERNEL);
 201         }
 202 }
 203
 204 /* This function handles channel report event from FW during CAC period.
 205  * If radar is detected during CAC, driver indicates the same to cfg80211
 206  * and also cancels ongoing delayed work.
 207  */
 208 int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv,
 209                                      struct sk_buff *skb)
 210 {
 211         struct host_cmd_ds_chan_rpt_event *rpt_event;
 212         struct mwifiex_ie_types_chan_rpt_data *rpt;
 213         u8 *evt_buf;
 214         u16 event_len, tlv_len;
 215
 216         rpt_event = (void *)(skb->data + sizeof(u32));
 217         event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+
 218                                 sizeof(u32));
 219
 220         if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) {
 221                 mwifiex_dbg(priv->adapter, ERROR,
 222                             "Error in channel report event\n");
 223                 return -1;
 224         }
 225
 226         evt_buf = (void *)&rpt_event->tlvbuf;
 227
 228         while (event_len >= sizeof(struct mwifiex_ie_types_header)) {
 229                 rpt = (void *)&rpt_event->tlvbuf;
 230                 tlv_len = le16_to_cpu(rpt->header.len);
 231
 232                 switch (le16_to_cpu(rpt->header.type)) {
 233                 case TLV_TYPE_CHANRPT_11H_BASIC:
 234                         if (rpt->map.radar) {
 235                                 mwifiex_dbg(priv->adapter, MSG,
 236                                             "RADAR Detected on channel %d!\n",
 237                                             priv->dfs_chandef.chan->hw_value);
 238                                 cancel_delayed_work_sync(&priv->dfs_cac_work);
 239                                 cfg80211_cac_event(priv->netdev,
 240                                                    &priv->dfs_chandef,
 241                                                    NL80211_RADAR_DETECTED,
 242                                                    GFP_KERNEL);
 243                         }
 244                         break;
 245                 default:
 246                         break;
 247                 }
 248
 249                 evt_buf += (tlv_len + sizeof(rpt->header));
 250                 event_len -= (tlv_len + sizeof(rpt->header));
 251         }
 252
 253         return 0;
 254 }
 255
 256 /* Handler for radar detected event from FW.*/
 257 int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv,
 258                                       struct sk_buff *skb)
 259 {
 260         struct mwifiex_radar_det_event *rdr_event;
 261
 262         rdr_event = (void *)(skb->data + sizeof(u32));
 263
 264         if (le32_to_cpu(rdr_event->passed)) {
 265                 mwifiex_dbg(priv->adapter, MSG,
 266                             "radar detected; indicating kernel\n");
 267                 if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
 268                         mwifiex_dbg(priv->adapter, ERROR,
 269                                     "Failed to stop CAC in FW\n");
 270                 cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef,
 271                                      GFP_KERNEL);
 272                 mwifiex_dbg(priv->adapter, MSG, "regdomain: %d\n",
 273                             rdr_event->reg_domain);
 274                 mwifiex_dbg(priv->adapter, MSG, "radar detection type: %d\n",
 275                             rdr_event->det_type);
 276         } else {
 277                 mwifiex_dbg(priv->adapter, MSG,
 278                             "false radar detection event!\n");
 279         }
 280
 281         return 0;
 282 }
 283
 284 /* This is work queue function for channel switch handling.
 285  * This function takes care of updating new channel definitin to
 286  * bss config structure, restart AP and indicate channel switch success
 287  * to cfg80211.
 288  */
 289 void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work)
 290 {
 291         struct mwifiex_uap_bss_param *bss_cfg;
 292         struct delayed_work *delayed_work =
 293                         container_of(work, struct delayed_work, work);
 294         struct mwifiex_private *priv =
 295                         container_of(delayed_work, struct mwifiex_private,
 296                                      dfs_chan_sw_work);
 297
 298         if (WARN_ON(!priv))
 299                 return;
 300
 301         bss_cfg = &priv->bss_cfg;
 302         if (!bss_cfg->beacon_period) {
 303                 mwifiex_dbg(priv->adapter, ERROR,
 304                             "channel switch: AP already stopped\n");
 305                 return;
 306         }
 307
 308         mwifiex_uap_set_channel(priv, bss_cfg, priv->dfs_chandef);
 309
 310         if (mwifiex_config_start_uap(priv, bss_cfg)) {
 311                 mwifiex_dbg(priv->adapter, ERROR,
 312                             "Failed to start AP after channel switch\n");
 313                 return;
 314         }
 315
 316         mwifiex_dbg(priv->adapter, MSG,
 317                     "indicating channel switch completion to kernel\n");
 318         cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef);
 319 }