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qcacmn: Add random channel selection algorithm

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Add random channel selection algorithm in DFS component.

Change-Id: Ic2d3ee3c6156213564a3eb354dfffa1bbc7ff01d
CRs-Fixed: 2017481
Этот коммит содержится в:
Arif Hussain
2017-02-10 09:52:09 -08:00
коммит произвёл Sandeep Puligilla
родитель 63acfd2b2e
Коммит 91ac5ea418
2 изменённых файлов: 744 добавлений и 0 удалений
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185
umac/dfs/core/src/dfs_random_chan_sel.h Обычный файл
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/*
* Copyright (c) 2012-2017 The Linux Foundation. All rights reserved.
*
* Previously licensed under the ISC license by Qualcomm Atheros, Inc.
*
*
* Permission to use, copy, modify, and/or distribute this software for
* any purpose with or without fee is hereby granted, provided that the
* above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This file was originally distributed by Qualcomm Atheros, Inc.
* under proprietary terms before Copyright ownership was assigned
* to the Linux Foundation.
*/
/* dfs regions definitions */
/* un-initialized region */
#define DFS_UNINIT_REGION_VAL 0
/* FCC region */
#define DFS_FCC_REGION_VAL 1
/* ETSI region */
#define DFS_ETSI_REGION_VAL 2
/* MKK region */
#define DFS_MKK_REGION_VAL 3
/* China region */
#define DFS_CN_REGION_VAL 4
/* Korea region */
#define DFS_KR_REGION_VAL 5
/* Undefined region */
#define DFS_UNDEF_REGION_VAL 6
/* Channel width definitions */
/* 20MHz channel width */
#define DFS_CH_WIDTH_20MHZ 0
/* 40MHz channel width */
#define DFS_CH_WIDTH_40MHZ 1
/* 80MHz channel width */
#define DFS_CH_WIDTH_80MHZ 2
/* 160MHz channel width */
#define DFS_CH_WIDTH_160MHZ 3
/* 80+80 non-contiguous */
#define DFS_CH_WIDTH_80P80MHZ 4
/* 5MHz channel width */
#define DFS_CH_WIDTH_5MHZ 5
/* 10MHz channel width */
#define DFS_CH_WIDTH_10MHZ 6
/* Invalid channel width */
#define DFS_CH_WIDTH_INVALID 7
/* Max channel width */
#define DFS_CH_WIDTH_MAX 8
/* Random channel flags */
/* Flag to exclude current operating channels */
#define DFS_RANDOM_CH_FLAG_NO_CURR_OPE_CH 0x0001 /* 0000 0000 0000 0001 */
/* Flag to exclude weather channels */
#define DFS_RANDOM_CH_FLAG_NO_WEATHER_CH 0x0002 /* 0000 0000 0000 0010 */
/* Flag to exclude indoor channels */
#define DFS_RANDOM_CH_FLAG_NO_LOWER_5G_CH 0x0004 /* 0000 0000 0000 0100 */
/* Flag to exclude outdoor channels */
#define DFS_RANDOM_CH_FLAG_NO_UPEER_5G_CH 0x0008 /* 0000 0000 0000 1000 */
/* Flag to exclude dfs channels */
#define DFS_RANDOM_CH_FLAG_NO_DFS_CH 0x0010 /* 0000 0000 0001 0000 */
/* Flag to exclude all 5GHz channels */
#define DFS_RANDOM_CH_FLAG_NO_5GHZ_CH 0x0020 /* 0000 0000 0010 0000 */
/* Flag to exclude all 2.4GHz channels */
#define DFS_RANDOM_CH_FLAG_NO_2GHZ_CH 0x0040 /* 0000 0000 0100 0000 */
/* Next 5GHz channel number */
#define DFS_80_NUM_SUB_CHANNNEL 4
/* Next 5GHz channel number */
#define DFS_NEXT_5GHZ_CHANNEL 4
/* Number of 20MHz channels in bitmap */
#define DFS_MAX_20M_SUB_CH 8
/* Number of 80MHz channels in 5GHz band */
#define DFS_MAX_80MHZ_BANDS 6
/* Start channel and center channel diff in 80Mhz */
#define DFS_80MHZ_START_CENTER_CH_DIFF 6
/* Max number of channels */
#define DFS_MAX_NUM_CHAN 128
/* Bitmap mask for 80MHz */
#define DFS_80MHZ_MASK 0x0F
/* Bitmap mask for 40MHz lower */
#define DFS_40MHZ_MASK_L 0x03
/* Bitmap mask for 40MHz higher */
#define DFS_40MHZ_MASK_H 0x0C
/* Adjacent weather radar channel */
#define DFS_ADJACENT_WEATHER_RADAR_CHANNEL 5580
/* Max 2.4 GHz channel number */
#define DFS_MAX_24GHZ_CHANNEL 14
/* Max valid channel number */
#define MAX_CHANNEL_NUM 184
#define DFS_IS_CHANNEL_WEATHER_RADAR(_f) (((_f) >= 5600) && ((_f) <= 5650))
#define DFS_IS_CHAN_JAPAN_INDOOR(_ch) (((_ch) >= 36) && ((_ch) <= 64))
#define DFS_IS_CHAN_JAPAN_OUTDOOR(_ch) (((_ch) >= 100) && ((_ch) <= 140))
/**
* struct chan_bonding_info - for holding channel bonding bitmap
* @chan_map: channel map
* @rsvd: reserved
* @start_chan: start channel
*/
struct chan_bonding_info {
uint8_t chan_map:4;
uint8_t rsvd:4;
uint8_t start_chan;
};
/**
* struct chan_bonding_bitmap - bitmap structure which represent
* all 5GHZ channels.
* @chan_bonding_set: channel bonding bitmap
*/
struct chan_bonding_bitmap {
struct chan_bonding_info chan_bonding_set[DFS_MAX_80MHZ_BANDS];
};
/**
* dfs_prepare_random_channel() - This function picks a random channel from
* the list of available channels.
* @dfs: dfs handler.
* @ch_list: channel list.
* @ch_count: Number of channels in given list.
* @flags: DFS_RANDOM_CH_FLAG_*
* @ch_wd: input channel width, used same variable to return new ch width.
* @cur_chan: current channel.
* @dfs_region: DFS region.
*
* Function used to find random channel selection from a given list.
* First this function removes channels based on flags and then uses final
* list to find channel based on requested bandwidth, if requested bandwidth
* not available, it chooses next lower bandwidth and try.
*
* Return: channel number, else zero.
*/
int dfs_prepare_random_channel(struct wlan_dfs *dfs,
struct dfs_ieee80211_channel *ch_list,
uint32_t ch_count,
uint32_t flags,
uint8_t *ch_wd,
struct dfs_ieee80211_channel *cur_chan,
uint8_t dfs_region);

559
umac/dfs/core/src/misc/dfs_random_chan_sel.c Обычный файл
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/*
* Copyright (c) 2012-2017 The Linux Foundation. All rights reserved.
*
* Previously licensed under the ISC license by Qualcomm Atheros, Inc.
*
*
* Permission to use, copy, modify, and/or distribute this software for
* any purpose with or without fee is hereby granted, provided that the
* above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This file was originally distributed by Qualcomm Atheros, Inc.
* under proprietary terms before Copyright ownership was assigned
* to the Linux Foundation.
*/
#include "../dfs.h"
#include "../dfs_random_chan_sel.h"
#include <qdf_mc_timer.h>
/**
* dfs_populate_80mhz_available_channels()- Populate channels for 80MHz uing bitmap
* @bitmap: bitmap
* @avail_chnl: prepared channel list
*
* Prepare 80MHz channels from the bitmap.
*
* Return: channel count
*/
static uint8_t dfs_populate_80mhz_available_channels(
struct chan_bonding_bitmap *bitmap,
uint8_t *avail_chnl)
{
uint8_t i = 0;
uint8_t chnl_count = 0;
uint8_t start_chan = 0;
for (i = 0; i < DFS_MAX_80MHZ_BANDS; i++) {
start_chan = bitmap->chan_bonding_set[i].start_chan;
if (bitmap->chan_bonding_set[i].chan_map ==
DFS_80MHZ_MASK) {
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 0);
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 1);
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 2);
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 3);
}
}
DFS_PRINTK("%s: channel count %d\n", __func__, chnl_count);
return chnl_count;
}
/**
* dfs_populate_40mhz_available_channels()- Populate channels for 40MHz uing bitmap
* @bitmap: bitmap
* @avail_chnl: prepared channel list
*
* Prepare 40MHz channels from the bitmap.
*
* Return: channel count
*/
static uint8_t dfs_populate_40mhz_available_channels(
struct chan_bonding_bitmap *bitmap,
uint8_t *avail_chnl)
{
uint8_t i = 0;
uint8_t chnl_count = 0;
uint8_t start_chan = 0;
for (i = 0; i < DFS_MAX_80MHZ_BANDS; i++) {
start_chan = bitmap->chan_bonding_set[i].start_chan;
if ((bitmap->chan_bonding_set[i].chan_map &
DFS_40MHZ_MASK_L) == DFS_40MHZ_MASK_L) {
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 0);
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 1);
}
if ((bitmap->chan_bonding_set[i].chan_map &
DFS_40MHZ_MASK_H) == DFS_40MHZ_MASK_H) {
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 2);
avail_chnl[chnl_count++] = start_chan +
(DFS_NEXT_5GHZ_CHANNEL * 3);
}
}
DFS_PRINTK("%s: channel count %d\n", __func__, chnl_count);
return chnl_count;
}
/**
* dfs_populate_available_channels()- Populate channels based on width and bitmap
* @bitmap: bitmap
* @ch_width: channel width
* @avail_chnl: prepared channel list
*
* Prepare channel list based on width and channel bitmap.
*
* Return: channel count
*/
static uint8_t dfs_populate_available_channels(
struct chan_bonding_bitmap *bitmap,
uint8_t ch_width,
uint8_t *avail_chnl)
{
switch (ch_width) {
case DFS_CH_WIDTH_160MHZ:
case DFS_CH_WIDTH_80P80MHZ:
case DFS_CH_WIDTH_80MHZ:
return dfs_populate_80mhz_available_channels(
bitmap, avail_chnl);
case DFS_CH_WIDTH_40MHZ:
return dfs_populate_40mhz_available_channels(
bitmap, avail_chnl);
default:
DFS_PRINTK(
"%s: Invalid ch_width %d\n", __func__, ch_width);
break;
}
return 0;
}
/**
* dfs_get_rand_from_lst()- Get random channel from a given channel list
* @ch_lst: channel list
* @num_ch: number of channels
*
* Get random channel from given channel list.
*
* Return: channel number
*/
static uint8_t dfs_get_rand_from_lst(uint8_t *ch_lst, uint8_t num_ch)
{
uint8_t i;
uint32_t rand_byte = 0;
if (!num_ch || !ch_lst) {
DFS_PRINTK("%s: invalid param ch_lst %p, num_ch = %d\n",
__func__, ch_lst, num_ch);
return 0;
}
get_random_bytes((uint8_t *)&rand_byte, 1);
i = (rand_byte + qdf_mc_timer_get_system_ticks()) % num_ch;
DFS_PRINTK("%s: random channel %d\n", __func__, ch_lst[i]);
return ch_lst[i];
}
/**
* dfs_random_channel_sel_set_bitmap()- Set channel bit in bitmap based
* on given channel number
* @bitmap: bitmap
* @channel: channel number
*
* Set channel bit in bitmap based on given channel number.
*
* Return: None
*/
static void dfs_random_channel_sel_set_bitmap(
struct chan_bonding_bitmap *bitmap,
uint8_t channel)
{
int i = 0;
int start_chan = 0;
for (i = 0; i < DFS_MAX_80MHZ_BANDS; i++) {
start_chan = bitmap->chan_bonding_set[i].start_chan;
if (channel >= start_chan && channel <= start_chan + 12) {
bitmap->chan_bonding_set[i].chan_map |=
(1 << ((channel - start_chan) /
DFS_80_NUM_SUB_CHANNNEL));
return;
}
}
DFS_PRINTK(
"%s: Channel=%d is not in the bitmap\n", __func__, channel);
}
/**
* dfs_find_ch_with_fallback()- find random channel
* @ch_wd: channel width
* @center_freq_seg1: center frequency of secondary segment.
* @ch_lst: list of available channels.
* @num_ch: number of channels in the list.
*
* Find random channel based on given channel width and channel list,
* fallback to lower width if requested channel width not available.
*
* Return: channel number
*/
static uint8_t dfs_find_ch_with_fallback(uint8_t *ch_wd,
uint8_t *center_freq_seg1,
uint8_t *ch_lst,
uint32_t num_ch)
{
bool flag = false;
uint32_t rand_byte = 0;
struct chan_bonding_bitmap ch_map = { { {0} } };
uint8_t count = 0, i, index = 0, final_cnt = 0, target_channel = 0;
uint8_t primary_seg_start_ch = 0, sec_seg_ch = 0, new_160_start_ch = 0;
uint8_t final_lst[DFS_MAX_NUM_CHAN] = {0};
/* initialize ch_map for all 80 MHz bands: we have 6 80MHz bands */
ch_map.chan_bonding_set[0].start_chan = 36;
ch_map.chan_bonding_set[1].start_chan = 52;
ch_map.chan_bonding_set[2].start_chan = 100;
ch_map.chan_bonding_set[3].start_chan = 116;
ch_map.chan_bonding_set[4].start_chan = 132;
ch_map.chan_bonding_set[5].start_chan = 149;
for (i = 0; i < num_ch; i++) {
DFS_PRINTK(
"%s: channel = %d added to bitmap\n", __func__, ch_lst[i]);
dfs_random_channel_sel_set_bitmap(&ch_map, ch_lst[i]);
}
/* populate available channel list from bitmap */
final_cnt = dfs_populate_available_channels(&ch_map, *ch_wd, final_lst);
/* If no valid ch bonding found, fallback */
if (final_cnt == 0) {
if ((*ch_wd == DFS_CH_WIDTH_160MHZ) ||
(*ch_wd == DFS_CH_WIDTH_80P80MHZ) ||
(*ch_wd == DFS_CH_WIDTH_80MHZ)) {
DFS_PRINTK(
"%s: from [%d] to 40Mhz\n", __func__, *ch_wd);
*ch_wd = DFS_CH_WIDTH_40MHZ;
} else if (*ch_wd == DFS_CH_WIDTH_40MHZ) {
DFS_PRINTK(
"%s: from 40Mhz to 20MHz\n", __func__);
*ch_wd = DFS_CH_WIDTH_20MHZ;
}
return 0;
}
/* ch count should be > 8 to switch new channel in 160Mhz band */
if (((*ch_wd == DFS_CH_WIDTH_160MHZ) ||
(*ch_wd == DFS_CH_WIDTH_80P80MHZ)) &&
(final_cnt < DFS_MAX_20M_SUB_CH)) {
DFS_PRINTK(
"%s: from [%d] to 80Mhz\n", __func__, *ch_wd);
*ch_wd = DFS_CH_WIDTH_80MHZ;
return 0;
}
if (*ch_wd == DFS_CH_WIDTH_160MHZ) {
/*
* Only 2 blocks for 160Mhz bandwidth i.e 36-64 & 100-128
* and all the channels in these blocks are continuous
* and seperated by 4Mhz.
*/
for (i = 1; ((i < final_cnt)); i++) {
if ((final_lst[i] - final_lst[i-1]) ==
DFS_NEXT_5GHZ_CHANNEL)
count++;
else
count = 0;
if (count == DFS_MAX_20M_SUB_CH - 1) {
flag = true;
new_160_start_ch = final_lst[i - count];
break;
}
}
} else if (*ch_wd == DFS_CH_WIDTH_80P80MHZ) {
flag = true;
}
if ((flag == false) && (*ch_wd > DFS_CH_WIDTH_80MHZ)) {
DFS_PRINTK("%s: from [%d] to 80Mhz\n", __func__, *ch_wd);
*ch_wd = DFS_CH_WIDTH_80MHZ;
return 0;
}
if (*ch_wd == DFS_CH_WIDTH_160MHZ) {
get_random_bytes((uint8_t *)&rand_byte, 1);
rand_byte = (rand_byte + qdf_mc_timer_get_system_ticks())
% DFS_MAX_20M_SUB_CH;
target_channel = new_160_start_ch + (rand_byte *
DFS_80_NUM_SUB_CHANNNEL);
} else if (*ch_wd == DFS_CH_WIDTH_80P80MHZ) {
get_random_bytes((uint8_t *)&rand_byte, 1);
index = (rand_byte + qdf_mc_timer_get_system_ticks()) %
final_cnt;
target_channel = final_lst[index];
index -= (index % DFS_80_NUM_SUB_CHANNNEL);
primary_seg_start_ch = final_lst[index];
/* reset channels associate with primary 80Mhz */
for (i = 0; i < DFS_80_NUM_SUB_CHANNNEL; i++)
final_lst[i + index] = 0;
/* select and calculate center freq for secondary segement */
for (i = 0; i < final_cnt / DFS_80_NUM_SUB_CHANNNEL; i++) {
if (final_lst[i * DFS_80_NUM_SUB_CHANNNEL] &&
(abs(primary_seg_start_ch -
final_lst[i * DFS_80_NUM_SUB_CHANNNEL]) >
(DFS_MAX_20M_SUB_CH * 2))) {
sec_seg_ch =
final_lst[i * DFS_80_NUM_SUB_CHANNNEL] +
DFS_80MHZ_START_CENTER_CH_DIFF;
break;
}
}
if (!sec_seg_ch && (final_cnt == DFS_MAX_20M_SUB_CH))
*ch_wd = DFS_CH_WIDTH_160MHZ;
else if (!sec_seg_ch)
*ch_wd = DFS_CH_WIDTH_80MHZ;
*center_freq_seg1 = sec_seg_ch;
DFS_PRINTK(
"%s: Center frequency seg1 = %d\n", __func__, sec_seg_ch);
} else {
target_channel = dfs_get_rand_from_lst(final_lst, final_cnt);
}
DFS_PRINTK("%s: target channel = %d\n", __func__, target_channel);
return target_channel;
}
/**
* dfs_remove_cur_ch_from_list()- remove current operating channels
* @ch_list: list of avilable channel list
* @ch_cnt: number of channels.
* @ch_wd: channel width.
* @cur_chan: current channel.
*
* Remove current channels from list of available channels.
*
* Return: channel number
*/
static void dfs_remove_cur_ch_from_list(
struct dfs_ieee80211_channel *ch_list,
uint32_t *ch_cnt,
uint8_t *ch_wd,
struct dfs_ieee80211_channel *cur_chan)
{
/* TODO */
return;
}
/**
* dfs_freq_is_in_nol()- check if given channel in nol list
* @dfs: dfs handler
* @freq: channel frequency.
*
* check if given channel in nol list.
*
* Return: true if channel in nol, false else
*/
static bool dfs_freq_is_in_nol(struct wlan_dfs *dfs, uint32_t freq)
{
struct dfs_nolelem *nol;
if (!dfs) {
DFS_PRINTK("%s: null dfs\n", __func__);
return false;
}
nol = dfs->dfs_nol;
while (nol) {
if (freq == nol->nol_freq) {
DFS_PRINTK("%s: %d is in nol\n", __func__, freq);
return true;
}
nol = nol->nol_next;
}
return false;
}
/**
* dfs_apply_rules()- prepare channel list based on flags
* @dfs: dfs handler
* @flags: channel flags
* @random_chan_list: ouput channel list
* @random_chan_cnt: output channel count
* @ch_list: input channel list
* @ch_cnt: input channel count
* @dfs_region: dfs region
*
* prepare channel list based on flags
*
* Return: None
*/
static void dfs_apply_rules(struct wlan_dfs *dfs,
uint32_t flags,
uint8_t *random_chan_list,
uint32_t *random_chan_cnt,
struct dfs_ieee80211_channel *ch_list,
uint32_t ch_cnt,
uint8_t dfs_region)
{
struct dfs_ieee80211_channel *chan;
uint16_t flag_no_wheather = 0;
uint16_t flag_no_lower_5g = 0;
uint16_t flag_no_upper_5g = 0;
uint16_t flag_no_dfs_chan = 0;
uint16_t flag_no_2g_chan = 0;
uint16_t flag_no_5g_chan = 0;
int i;
DFS_PRINTK("%s: flags %d\n", __func__, flags);
flag_no_wheather = (dfs_region == DFS_ETSI_REGION_VAL) ?
flags & DFS_RANDOM_CH_FLAG_NO_WEATHER_CH : 0;
flag_no_lower_5g = (dfs_region == DFS_MKK_REGION_VAL) ?
flags & DFS_RANDOM_CH_FLAG_NO_LOWER_5G_CH : 0;
flag_no_upper_5g = (dfs_region == DFS_MKK_REGION_VAL) ?
flags & DFS_RANDOM_CH_FLAG_NO_UPEER_5G_CH : 0;
flag_no_dfs_chan = flags & DFS_RANDOM_CH_FLAG_NO_DFS_CH;
flag_no_2g_chan = flags & DFS_RANDOM_CH_FLAG_NO_2GHZ_CH;
flag_no_5g_chan = flags & DFS_RANDOM_CH_FLAG_NO_5GHZ_CH;
for (i = 0; i < ch_cnt; i++) {
chan = &ch_list[i];
if ((chan->ic_ieee == 0) || (chan->ic_ieee > MAX_CHANNEL_NUM)) {
DFS_PRINTK("%s: invalid channel %d\n",
__func__, chan->ic_ieee);
continue;
}
if (flag_no_2g_chan && chan->ic_ieee <= DFS_MAX_24GHZ_CHANNEL) {
DFS_PRINTK("%s: skip 2.4 GHz channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
if (flag_no_5g_chan && chan->ic_ieee > DFS_MAX_24GHZ_CHANNEL) {
DFS_PRINTK("%s: skip 5 GHz channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
if (flag_no_wheather) {
/*
* We should also avoid this channel in HT40 mode as
* extension channel will be on 5600.
*/
/* TODO check if reg updating chan->ic_flags for
* IEEE80211_CHAN_11NA_HT40PLUS
* */
if (DFS_IS_CHANNEL_WEATHER_RADAR(chan->ic_freq)) {
DFS_PRINTK("%s: skip weather channel=%d\n",
__func__, chan->ic_ieee);
continue;
} else if (DFS_ADJACENT_WEATHER_RADAR_CHANNEL ==
chan->ic_freq && (chan->ic_flags &
IEEE80211_CHAN_11NA_HT40PLUS)) {
DFS_PRINTK("%s: skip weather adjacent ch=%d\n",
__func__, chan->ic_ieee);
continue;
}
}
if (flag_no_lower_5g &&
DFS_IS_CHAN_JAPAN_INDOOR(chan->ic_freq)) {
DFS_PRINTK("%s: skip indoor channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
if (flag_no_upper_5g &&
DFS_IS_CHAN_JAPAN_OUTDOOR(chan->ic_freq)) {
DFS_PRINTK("%s: skip outdoor channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
if (flag_no_dfs_chan &&
(chan->ic_flagext & IEEE80211_CHAN_DFS)) {
DFS_PRINTK("%s: skip dfs channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
if (dfs_freq_is_in_nol(dfs, chan->ic_freq)) {
DFS_PRINTK("%s: skip nol channel=%d\n",
__func__, chan->ic_ieee);
continue;
}
random_chan_list[*random_chan_cnt] = chan->ic_ieee;
*random_chan_cnt += 1;
}
}
int dfs_prepare_random_channel(struct wlan_dfs *dfs,
struct dfs_ieee80211_channel *ch_list,
uint32_t ch_cnt,
uint32_t flags,
uint8_t *ch_wd,
struct dfs_ieee80211_channel *cur_chan,
uint8_t dfs_region)
{
uint8_t target_ch = 0;
uint8_t *random_chan_list = NULL;
uint32_t random_chan_cnt = 0;
if (!ch_list || !ch_cnt) {
DFS_PRINTK("%s: Invalid params %p, ch_cnt=%d\n",
__func__, ch_list, ch_cnt);
return 0;
}
if (*ch_wd < DFS_CH_WIDTH_20MHZ || *ch_wd > DFS_CH_WIDTH_80P80MHZ) {
DFS_PRINTK("%s: Invalid ch_wd %d\n", __func__, *ch_wd);
return 0;
}
random_chan_list = qdf_mem_malloc(ch_cnt * sizeof(*random_chan_list));
if (!random_chan_list) {
DFS_PRINTK("%s: Memory allocation failed\n", __func__);
return 0;
}
if (flags & DFS_RANDOM_CH_FLAG_NO_CURR_OPE_CH)
dfs_remove_cur_ch_from_list(ch_list, &ch_cnt, ch_wd, cur_chan);
dfs_apply_rules(dfs, flags, random_chan_list, &random_chan_cnt,
ch_list, ch_cnt, dfs_region);
do {
if (*ch_wd == DFS_CH_WIDTH_20MHZ) {
target_ch = dfs_get_rand_from_lst(
random_chan_list, random_chan_cnt);
break;
}
target_ch = dfs_find_ch_with_fallback(ch_wd,
&cur_chan->ic_vhtop_ch_freq_seg2,
random_chan_list,
random_chan_cnt);
if (target_ch)
break;
} while (true);
qdf_mem_free(random_chan_list);
DFS_PRINTK("%s: target_ch = %d\n", __func__, target_ch);
return target_ch;
}