/*
* Marvell Wireless LAN device driver: 802.11h
*
* Copyright (C) 2013-2014, Marvell International Ltd.
*
* This software file (the "File") is distributed by Marvell International
* Ltd. under the terms of the GNU General Public License Version 2, June 1991
* (the "License"). You may use, redistribute and/or modify this File in
* accordance with the terms and conditions of the License, a copy of which
* is available by writing to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
* this warranty disclaimer.
*/
#include "main.h"
#include "fw.h"
void mwifiex_init_11h_params(struct mwifiex_private *priv)
{
priv->state_11h.is_11h_enabled = true;
priv->state_11h.is_11h_active = false;
}
inline int mwifiex_is_11h_active(struct mwifiex_private *priv)
{
return priv->state_11h.is_11h_active;
}
/* This function appends 11h info to a buffer while joining an
* infrastructure BSS
*/
static void
mwifiex_11h_process_infra_join(struct mwifiex_private *priv, u8 **buffer,
struct mwifiex_bssdescriptor *bss_desc)
{
struct mwifiex_ie_types_header *ie_header;
struct mwifiex_ie_types_pwr_capability *cap;
struct mwifiex_ie_types_local_pwr_constraint *constraint;
struct ieee80211_supported_band *sband;
u8 radio_type;
int i;
if (!buffer || !(*buffer))
return;
radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band);
sband = priv->wdev.wiphy->bands[radio_type];
cap = (struct mwifiex_ie_types_pwr_capability *)*buffer;
cap->header.type = cpu_to_le16(WLAN_EID_PWR_CAPABILITY);
cap->header.len = cpu_to_le16(2);
cap->min_pwr = 0;
cap->max_pwr = 0;
*buffer += sizeof(*cap);
constraint = (struct mwifiex_ie_types_local_pwr_constraint *)*buffer;
constraint->header.type = cpu_to_le16(WLAN_EID_PWR_CONSTRAINT);
constraint->header.len = cpu_to_le16(2);
constraint->chan = bss_desc->channel;
constraint->constraint = bss_desc->local_constraint;
*buffer += sizeof(*constraint);
ie_header = (struct mwifiex_ie_types_header *)*buffer;
ie_header->type = cpu_to_le16(TLV_TYPE_PASSTHROUGH);
ie_header->len = cpu_to_le16(2 * sband->n_channels + 2);
*buffer += sizeof(*ie_header);
*(*buffer)++ = WLAN_EID_SUPPORTED_CHANNELS;
*(*buffer)++ = 2 * sband->n_channels;
for (i = 0; i < sband->n_channels; i++) {
*(*buffer)++ = ieee80211_frequency_to_channel(
sband->channels[i].center_freq);
*(*buffer)++ = 1; /* one channel in the subband */
}
}
/* Enable or disable the 11h extensions in the firmware */
int mwifiex_11h_activate(struct mwifiex_private *priv, bool flag)
{
u32 enable = flag;
/* enable master mode radar detection on AP interface */
if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) && enable)
enable |= MWIFIEX_MASTER_RADAR_DET_MASK;
return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
HostCmd_ACT_GEN_SET, DOT11H_I, &enable, true);
}
/* This functions processes TLV buffer for a pending BSS Join command.
*
* Activate 11h functionality in the firmware if the spectrum management
* capability bit is found in the network we are joining. Also, necessary
* TLVs are set based on requested network's 11h capability.
*/
void mwifiex_11h_process_join(struct mwifiex_private *priv, u8 **buffer,
struct mwifiex_bssdescriptor *bss_desc)
{
if (bss_desc->sensed_11h) {
/* Activate 11h functions in firmware, turns on capability
* bit
*/
mwifiex_11h_activate(priv, true);
priv->state_11h.is_11h_active = true;
bss_desc->cap_info_bitmap |= WLAN_CAPABILITY_SPECTRUM_MGMT;
mwifiex_11h_process_infra_join(priv, buffer, bss_desc);
} else {
/* Deactivate 11h functions in the firmware */
mwifiex_11h_activate(priv, false);
priv->state_11h.is_11h_active = false;
bss_desc->cap_info_bitmap &= ~WLAN_CAPABILITY_SPECTRUM_MGMT;
}
}
/* This is DFS CAC work queue function.
* This delayed work emits CAC finished event for cfg80211 if
* CAC was started earlier.
*/
void mwifiex_dfs_cac_work_queue(struct work_struct *work)
{
struct cfg80211_chan_def chandef;
struct delayed_work *delayed_work = to_delayed_work(work);
struct mwifiex_private *priv =
container_of(delayed_work, struct mwifiex_private,
dfs_cac_work);
if (WARN_ON(!priv))
return;
chandef = priv->dfs_chandef;
if (priv->wdev.cac_started) {
mwifiex_dbg(priv->adapter, MSG,
"CAC timer finished; No radar detected\n");
cfg80211_cac_event(priv->netdev, &chandef,
NL80211_RADAR_CAC_FINISHED,
GFP_KERNEL);
}
}
/* This function prepares channel report request command to FW for
* starting radar detection.
*/
int mwifiex_cmd_issue_chan_report_request(struct mwifiex_private *priv,
struct host_cmd_ds_command *cmd,
void *data_buf)
{
struct host_cmd_ds_chan_rpt_req *cr_req = &cmd->params.chan_rpt_req;
struct mwifiex_radar_params *radar_params = (void *)data_buf;
cmd->command = cpu_to_le16(HostCmd_CMD_CHAN_REPORT_REQUEST);
cmd->size = cpu_to_le16(S_DS_GEN);
le16_unaligned_add_cpu(&cmd->size,
sizeof(struct host_cmd_ds_chan_rpt_req));
cr_req->chan_desc.start_freq = cpu_to_le16(MWIFIEX_A_BAND_START_FREQ);
cr_req->chan_desc.chan_num = radar_params->chandef->chan->hw_value;
cr_req->chan_desc.chan_width = radar_params->chandef->width;
cr_req->msec_dwell_time = cpu_to_le32(radar_params->cac_time_ms);
if (radar_params->cac_time_ms)
mwifiex_dbg(priv->adapter, MSG,
"11h: issuing DFS Radar check for channel=%d\n",
radar_params->chandef->chan->hw_value);
else
mwifiex_dbg(priv->adapter, MSG, "cancelling CAC\n");
return 0;
}
int mwifiex_stop_radar_detection(struct mwifiex_private *priv,
struct cfg80211_chan_def *chandef)
{
struct mwifiex_radar_params radar_params;
memset(&radar_params, 0, sizeof(struct mwifiex_radar_params));
radar_params.chandef = chandef;
radar_params.cac_time_ms = 0;
return mwifiex_send_cmd(priv, HostCmd_CMD_CHAN_REPORT_REQUEST,
HostCmd_ACT_GEN_SET, 0, &radar_params, true);
}
/* This function is to abort ongoing CAC upon stopping AP operations
* or during unload.
*/
void mwifiex_abort_cac(struct mwifiex_private *priv)
{
if (priv->wdev.cac_started) {
if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
mwifiex_dbg(priv->adapter, ERROR,
"failed to stop CAC in FW\n");
mwifiex_dbg(priv->adapter, MSG,
"Aborting delayed work for CAC.\n");
cancel_delayed_work_sync(&priv->dfs_cac_work);
cfg80211_cac_event(priv->netdev, &priv->dfs_chandef,
NL80211_RADAR_CAC_ABORTED, GFP_KERNEL);
}
}
/* This function handles channel report event from FW during CAC period.
* If radar is detected during CAC, driver indicates the same to cfg80211
* and also cancels ongoing delayed work.
*/
int mwifiex_11h_handle_chanrpt_ready(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct host_cmd_ds_chan_rpt_event *rpt_event;
struct mwifiex_ie_types_chan_rpt_data *rpt;
u8 *evt_buf;
u16 event_len, tlv_len;
rpt_event = (void *)(skb->data + sizeof(u32));
event_len = skb->len - (sizeof(struct host_cmd_ds_chan_rpt_event)+
sizeof(u32));
if (le32_to_cpu(rpt_event->result) != HostCmd_RESULT_OK) {
mwifiex_dbg(priv->adapter, ERROR,
"Error in channel report event\n");
return -1;
}
evt_buf = (void *)&rpt_event->tlvbuf;
while (event_len >= sizeof(struct mwifiex_ie_types_header)) {
rpt = (void *)&rpt_event->tlvbuf;
tlv_len = le16_to_cpu(rpt->header.len);
switch (le16_to_cpu(rpt->header.type)) {
case TLV_TYPE_CHANRPT_11H_BASIC:
if (rpt->map.radar) {
mwifiex_dbg(priv->adapter, MSG,
"RADAR Detected on channel %d!\n",
priv->dfs_chandef.chan->hw_value);
cancel_delayed_work_sync(&priv->dfs_cac_work);
cfg80211_cac_event(priv->netdev,
&priv->dfs_chandef,
NL80211_RADAR_DETECTED,
GFP_KERNEL);
}
break;
default:
break;
}
evt_buf += (tlv_len + sizeof(rpt->header));
event_len -= (tlv_len + sizeof(rpt->header));
}
return 0;
}
/* Handler for radar detected event from FW.*/
int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct mwifiex_radar_det_event *rdr_event;
rdr_event = (void *)(skb->data + sizeof(u32));
mwifiex_dbg(priv->adapter, MSG,
"radar detected; indicating kernel\n");
if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
mwifiex_dbg(priv->adapter, ERROR,
"Failed to stop CAC in FW\n");
cfg80211_radar_event(priv->adapter->wiphy, &priv->dfs_chandef,
GFP_KERNEL);
mwifiex_dbg(priv->adapter, MSG, "regdomain: %d\n",
rdr_event->reg_domain);
mwifiex_dbg(priv->adapter, MSG, "radar detection type: %d\n",
rdr_event->det_type);
return 0;
}
/* This is work queue function for channel switch handling.
* This function takes care of updating new channel definitin to
* bss config structure, restart AP and indicate channel switch success
* to cfg80211.
*/
void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work)
{
struct mwifiex_uap_bss_param *bss_cfg;
struct delayed_work *delayed_work = to_delayed_work(work);
struct mwifiex_private *priv =
container_of(delayed_work, struct mwifiex_private,
dfs_chan_sw_work);
if (WARN_ON(!priv))
return;
bss_cfg = &priv->bss_cfg;
if (!bss_cfg->beacon_period) {
mwifiex_dbg(priv->adapter, ERROR,
"channel switch: AP already stopped\n");
return;
}
mwifiex_uap_set_channel(priv, bss_cfg, priv->dfs_chandef);
if (mwifiex_config_start_uap(priv, bss_cfg)) {
mwifiex_dbg(priv->adapter, ERROR,
"Failed to start AP after channel switch\n");
return;
}
mwifiex_dbg(priv->adapter, MSG,
"indicating channel switch completion to kernel\n");
cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef);
}
