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 24void 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 30inline 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 */ 37static void 38mwifiex_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 */ 82int 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 */ 100void 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 */ 123void 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 dev_dbg(priv->adapter->dev, 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 */ 148int 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 dev_dbg(priv->adapter->dev, 165 "11h: issuing DFS Radar check for channel=%d\n", 166 radar_params->chandef->chan->hw_value); 167 168 return 0; 169} 170 171/* This function is to abort ongoing CAC upon stopping AP operations 172 * or during unload. 173 */ 174void mwifiex_abort_cac(struct mwifiex_private *priv) 175{ 176 if (priv->wdev.cac_started) { 177 dev_dbg(priv->adapter->dev, 178 "Aborting delayed work for CAC.\n"); 179 cancel_delayed_work_sync(&priv->dfs_cac_work); 180 cfg80211_cac_event(priv->netdev, &priv->dfs_chandef, 181 NL80211_RADAR_CAC_ABORTED, GFP_KERNEL); 182 } 183} 184 185/* This function handles channel report event from FW during CAC period. 186 * If radar is detected during CAC, driver indicates the same to cfg80211 187 * and also cancels ongoing delayed work. 188 */ 189int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv, 190 struct sk_buff *skb) 191{ 192 struct host_cmd_ds_chan_rpt_event *rpt_event; 193 struct mwifiex_ie_types_chan_rpt_data *rpt; 194 u8 *evt_buf; 195 u16 event_len, tlv_len; 196 197 rpt_event = (void *)(skb->data + sizeof(u32)); 198 event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+ 199 sizeof(u32)); 200 201 if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) { 202 dev_err(priv->adapter->dev, "Error in channel report event\n"); 203 return -1; 204 } 205 206 evt_buf = (void *)&rpt_event->tlvbuf; 207 208 while (event_len >= sizeof(struct mwifiex_ie_types_header)) { 209 rpt = (void *)&rpt_event->tlvbuf; 210 tlv_len = le16_to_cpu(rpt->header.len); 211 212 switch (le16_to_cpu(rpt->header.type)) { 213 case TLV_TYPE_CHANRPT_11H_BASIC: 214 if (rpt->map.radar) { 215 dev_notice(priv->adapter->dev, 216 "RADAR Detected on channel %d!\n", 217 priv->dfs_chandef.chan->hw_value); 218 cancel_delayed_work_sync(&priv->dfs_cac_work); 219 cfg80211_cac_event(priv->netdev, 220 &priv->dfs_chandef, 221 NL80211_RADAR_DETECTED, 222 GFP_KERNEL); 223 } 224 break; 225 default: 226 break; 227 } 228 229 evt_buf += (tlv_len + sizeof(rpt->header)); 230 event_len -= (tlv_len + sizeof(rpt->header)); 231 } 232 233 return 0; 234} 235 236/* Handler for radar detected event from FW.*/ 237int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv, 238 struct sk_buff *skb) 239{ 240 struct mwifiex_radar_det_event *rdr_event; 241 242 rdr_event = (void *)(skb->data + sizeof(u32)); 243 244 if (le32_to_cpu(rdr_event->passed)) { 245 dev_notice(priv->adapter->dev, 246 "radar detected; indicating kernel\n"); 247 cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef, 248 GFP_KERNEL); 249 dev_dbg(priv->adapter->dev, "regdomain: %d\n", 250 rdr_event->reg_domain); 251 dev_dbg(priv->adapter->dev, "radar detection type: %d\n", 252 rdr_event->det_type); 253 } else { 254 dev_dbg(priv->adapter->dev, "false radar detection event!\n"); 255 } 256 257 return 0; 258} 259 260/* This is work queue function for channel switch handling. 261 * This function takes care of updating new channel definitin to 262 * bss config structure, restart AP and indicate channel switch success 263 * to cfg80211. 264 */ 265void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) 266{ 267 struct mwifiex_uap_bss_param *bss_cfg; 268 struct delayed_work *delayed_work = 269 container_of(work, struct delayed_work, work); 270 struct mwifiex_private *priv = 271 container_of(delayed_work, struct mwifiex_private, 272 dfs_chan_sw_work); 273 274 if (WARN_ON(!priv)) 275 return; 276 277 bss_cfg = &priv->bss_cfg; 278 if (!bss_cfg->beacon_period) { 279 dev_err(priv->adapter->dev, 280 "channel switch: AP already stopped\n"); 281 return; 282 } 283 284 mwifiex_uap_set_channel(bss_cfg, priv->dfs_chandef); 285 286 if (mwifiex_config_start_uap(priv, bss_cfg)) { 287 dev_dbg(priv->adapter->dev, 288 "Failed to start AP after channel switch\n"); 289 return; 290 } 291 292 dev_notice(priv->adapter->dev, 293 "indicating channel switch completion to kernel\n"); 294 cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef); 295} 296