[][MAC80211][WiFi6][hostapd][Add support for DFS channel switch with CSA sent]
[Description]
Add support for DFS channel switch with CSA sent
Also, add DFS channel switch mechanism with background radar is enabled
[Release-log]
N/A
Change-Id: I7469e65a659ee0eb2603bc3de704e315718c2ae0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8260504
diff --git a/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0047-hostapd-mtk-add-support-for-channel-switching-to-dfs.patch b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0047-hostapd-mtk-add-support-for-channel-switching-to-dfs.patch
new file mode 100644
index 0000000..82b66f4
--- /dev/null
+++ b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0047-hostapd-mtk-add-support-for-channel-switching-to-dfs.patch
@@ -0,0 +1,135 @@
+From 018d87d5b9b53b3e630032bf2cb7e6eaeae09d71 Mon Sep 17 00:00:00 2001
+From: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+Date: Wed, 15 Nov 2023 15:06:00 +0800
+Subject: [PATCH 47/49] hostapd: mtk: add support for channel switching to dfs
+ with csa sent
+
+Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+---
+ hostapd/ctrl_iface.c | 26 ++------------------------
+ src/ap/beacon.c | 5 +++++
+ src/ap/dfs.c | 16 ++++++++++++----
+ src/ap/ieee802_11.c | 5 +++++
+ 4 files changed, 24 insertions(+), 28 deletions(-)
+
+diff --git a/hostapd/ctrl_iface.c b/hostapd/ctrl_iface.c
+index b521a08..0afa6a2 100644
+--- a/hostapd/ctrl_iface.c
++++ b/hostapd/ctrl_iface.c
+@@ -2747,7 +2747,6 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ int dfs_range = 0;
+ unsigned int i;
+ int bandwidth;
+- u8 chan;
+
+ ret = hostapd_parse_csa_settings(pos, &settings);
+ if (ret)
+@@ -2809,29 +2808,8 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ iface, bandwidth, settings.freq_params.center_freq2);
+
+ if (dfs_range) {
+- ret = ieee80211_freq_to_chan(settings.freq_params.freq, &chan);
+- if (ret == NUM_HOSTAPD_MODES) {
+- wpa_printf(MSG_ERROR,
+- "Failed to get channel for (freq=%d, sec_channel_offset=%d, bw=%d)",
+- settings.freq_params.freq,
+- settings.freq_params.sec_channel_offset,
+- settings.freq_params.bandwidth);
+- return -1;
+- }
+-
+- settings.freq_params.channel = chan;
+-
+- wpa_printf(MSG_DEBUG,
+- "DFS/CAC to (channel=%u, freq=%d, sec_channel_offset=%d, bw=%d, center_freq1=%d)",
+- settings.freq_params.channel,
+- settings.freq_params.freq,
+- settings.freq_params.sec_channel_offset,
+- settings.freq_params.bandwidth,
+- settings.freq_params.center_freq1);
+-
+- /* Perform CAC and switch channel */
+- hostapd_switch_channel_fallback(iface, &settings.freq_params);
+- return 0;
++ settings.cs_count = 5;
++ settings.block_tx = 1;
+ }
+
+ for (i = 0; i < iface->num_bss; i++) {
+diff --git a/src/ap/beacon.c b/src/ap/beacon.c
+index 02f4f87..f9c4924 100644
+--- a/src/ap/beacon.c
++++ b/src/ap/beacon.c
+@@ -2027,6 +2027,11 @@ static int __ieee802_11_set_beacon(struct hostapd_data *hapd)
+ return -1;
+ }
+
++ if (iface->cac_started) {
++ wpa_printf(MSG_DEBUG, "Ignore set beacons during CAC period");
++ return 0;
++ }
++
+ hapd->beacon_set_done = 1;
+
+ if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
+diff --git a/src/ap/dfs.c b/src/ap/dfs.c
+index 80d3605..012050c 100644
+--- a/src/ap/dfs.c
++++ b/src/ap/dfs.c
+@@ -1255,10 +1255,10 @@ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
+ * another radio.
+ */
+ if (iface->state != HAPD_IFACE_ENABLED &&
+- hostapd_is_dfs_chan_available(iface)) {
++ hostapd_is_dfs_chan_available(iface))
+ hostapd_setup_interface_complete(iface, 0);
+- iface->cac_started = 0;
+- }
++
++ iface->cac_started = 0;
+
+ /*
+ * When background radar is enabled but the CAC completion
+@@ -1272,6 +1272,13 @@ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
+ } else if (hostapd_dfs_is_background_event(iface, freq)) {
+ iface->radar_background.cac_started = 0;
+ hostpad_dfs_update_background_chain(iface);
++ } else {
++ int i;
++
++ iface->cac_started = 0;
++ /* Clear all CSA flags once channel switch to DFS channel fails */
++ for (i = 0; i < iface->num_bss; i++)
++ iface->bss[i]->csa_in_progress = 0;
+ }
+
+ return 0;
+@@ -1646,7 +1653,8 @@ int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq,
+ } else {
+ /* This is called when the driver indicates that an offloaded
+ * DFS has started CAC. */
+- hostapd_set_state(iface, HAPD_IFACE_DFS);
++ if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
++ hostapd_set_state(iface, HAPD_IFACE_DFS);
+ iface->cac_started = 1;
+ }
+ /* TODO: How to check CAC time for ETSI weather channels? */
+diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
+index 01ceb79..dd477fd 100644
+--- a/src/ap/ieee802_11.c
++++ b/src/ap/ieee802_11.c
+@@ -6352,6 +6352,11 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len,
+ return 1;
+ }
+
++ if (hapd->iface->cac_started) {
++ wpa_printf(MSG_DEBUG, "MGMT: Ignore management frame during CAC");
++ return 1;
++ }
++
+ if (stype == WLAN_FC_STYPE_PROBE_REQ) {
+ handle_probe_req(hapd, mgmt, len, ssi_signal);
+ return 1;
+--
+2.18.0
+
diff --git a/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0048-hostapd-mtk-add-support-for-channel-switching-with-c.patch b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0048-hostapd-mtk-add-support-for-channel-switching-with-c.patch
new file mode 100644
index 0000000..25279fd
--- /dev/null
+++ b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0048-hostapd-mtk-add-support-for-channel-switching-with-c.patch
@@ -0,0 +1,407 @@
+From bc355858a09c6a700a08bc1141912afc515e6106 Mon Sep 17 00:00:00 2001
+From: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+Date: Thu, 16 Nov 2023 13:18:48 +0800
+Subject: [PATCH] hostapd: mtk: add support for channel switching with csa sent
+ when background radar is enabled
+
+Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+---
+ hostapd/ctrl_iface.c | 83 +++++++++++++++++-----
+ src/ap/ctrl_iface_ap.c | 5 +-
+ src/ap/dfs.c | 153 +++++++++++++++++++++++++++++++++++------
+ src/ap/dfs.h | 9 ++-
+ 4 files changed, 210 insertions(+), 40 deletions(-)
+
+diff --git a/hostapd/ctrl_iface.c b/hostapd/ctrl_iface.c
+index 0afa6a2..1208241 100644
+--- a/hostapd/ctrl_iface.c
++++ b/hostapd/ctrl_iface.c
+@@ -2742,11 +2742,12 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ char *pos)
+ {
+ #ifdef NEED_AP_MLME
+- struct csa_settings settings;
++ struct csa_settings settings, background_settings;
+ int ret;
+- int dfs_range = 0;
++ int freq, state;
+ unsigned int i;
+- int bandwidth;
++ int bandwidth, oper_chwidth;
++ bool background_radar, bw_changed, cac_required = false;
+
+ ret = hostapd_parse_csa_settings(pos, &settings);
+ if (ret)
+@@ -2762,21 +2763,28 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ switch (settings.freq_params.bandwidth) {
+ case 40:
+ bandwidth = CHAN_WIDTH_40;
++ oper_chwidth = CONF_OPER_CHWIDTH_USE_HT;
+ break;
+ case 80:
+- if (settings.freq_params.center_freq2)
++ if (settings.freq_params.center_freq2) {
+ bandwidth = CHAN_WIDTH_80P80;
+- else
++ oper_chwidth = CONF_OPER_CHWIDTH_80P80MHZ;
++ } else {
+ bandwidth = CHAN_WIDTH_80;
++ oper_chwidth = CONF_OPER_CHWIDTH_80MHZ;
++ }
+ break;
+ case 160:
+ bandwidth = CHAN_WIDTH_160;
++ oper_chwidth = CONF_OPER_CHWIDTH_160MHZ;
+ break;
+ case 320:
+ bandwidth = CHAN_WIDTH_320;
++ oper_chwidth = CONF_OPER_CHWIDTH_320MHZ;
+ break;
+ default:
+ bandwidth = CHAN_WIDTH_20;
++ oper_chwidth = CONF_OPER_CHWIDTH_USE_HT;
+ break;
+ }
+
+@@ -2797,19 +2805,30 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ }
+
+ if (settings.freq_params.center_freq1)
+- dfs_range += hostapd_is_dfs_overlap(
+- iface, bandwidth, settings.freq_params.center_freq1);
++ freq = settings.freq_params.center_freq1;
+ else
+- dfs_range += hostapd_is_dfs_overlap(
+- iface, bandwidth, settings.freq_params.freq);
+-
+- if (settings.freq_params.center_freq2)
+- dfs_range += hostapd_is_dfs_overlap(
+- iface, bandwidth, settings.freq_params.center_freq2);
+-
+- if (dfs_range) {
+- settings.cs_count = 5;
+- settings.block_tx = 1;
++ freq = settings.freq_params.freq;
++
++ bw_changed = oper_chwidth != hostapd_get_oper_chwidth(iface->conf);
++ state = hostapd_dfs_get_target_state(iface, bandwidth, freq,
++ settings.freq_params.center_freq2);
++ switch (state) {
++ case HOSTAPD_CHAN_DFS_USABLE:
++ cac_required = true;
++ /* fallthrough */
++ case HOSTAPD_CHAN_DFS_AVAILABLE:
++ background_radar = hostapd_dfs_handle_csa(iface, &settings,
++ &background_settings,
++ cac_required,
++ bw_changed);
++ break;
++ case HOSTAPD_CHAN_DFS_UNAVAILABLE:
++ case HOSTAPD_CHAN_DFS_UNKNOWN:
++ default:
++ wpa_printf(MSG_INFO,
++ "chanswitch: the dfs state of target channel is %s, so stop switching",
++ state == HOSTAPD_CHAN_DFS_UNAVAILABLE ? "UNAVAILABLE" : "UNKNOWN");
++ return -1;
+ }
+
+ for (i = 0; i < iface->num_bss; i++) {
+@@ -2826,6 +2845,36 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+ }
+ }
+
++ if (background_radar) {
++ u8 seg0, seg1;
++
++ ieee80211_freq_to_chan(background_settings.freq_params.center_freq1, &seg0);
++ ieee80211_freq_to_chan(background_settings.freq_params.center_freq2, &seg1);
++ ret = hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
++ background_settings.freq_params.freq,
++ background_settings.freq_params.channel,
++ background_settings.freq_params.ht_enabled,
++ background_settings.freq_params.vht_enabled,
++ background_settings.freq_params.he_enabled,
++ background_settings.freq_params.eht_enabled,
++ background_settings.freq_params.sec_channel_offset,
++ oper_chwidth, seg0, seg1, true);
++ if (ret) {
++ wpa_printf(MSG_ERROR, "Background radar start dfs cac failed, %d",
++ ret);
++ iface->radar_background.channel = -1;
++ return -1;
++ }
++
++ /* Cache background radar parameters. */
++ iface->radar_background.channel = background_settings.freq_params.channel;
++ iface->radar_background.secondary_channel =
++ background_settings.freq_params.sec_channel_offset;
++ iface->radar_background.freq = background_settings.freq_params.freq;
++ iface->radar_background.centr_freq_seg0_idx = seg0;
++ iface->radar_background.centr_freq_seg1_idx = seg1;
++ }
++
+ return 0;
+ #else /* NEED_AP_MLME */
+ return -1;
+diff --git a/src/ap/ctrl_iface_ap.c b/src/ap/ctrl_iface_ap.c
+index 86e8729..005c9fa 100644
+--- a/src/ap/ctrl_iface_ap.c
++++ b/src/ap/ctrl_iface_ap.c
+@@ -907,6 +907,7 @@ int hostapd_parse_csa_settings(const char *pos,
+ struct csa_settings *settings)
+ {
+ char *end;
++ int ret;
+
+ os_memset(settings, 0, sizeof(*settings));
+ settings->cs_count = strtol(pos, &end, 10);
+@@ -916,7 +917,9 @@ int hostapd_parse_csa_settings(const char *pos,
+ }
+
+ settings->freq_params.freq = atoi(end);
+- if (settings->freq_params.freq == 0) {
++ ret = ieee80211_freq_to_chan(settings->freq_params.freq,
++ &settings->freq_params.channel);
++ if (ret == NUM_HOSTAPD_MODES) {
+ wpa_printf(MSG_ERROR, "chanswitch: invalid freq provided");
+ return -1;
+ }
+diff --git a/src/ap/dfs.c b/src/ap/dfs.c
+index 012050c..a73f4ba 100644
+--- a/src/ap/dfs.c
++++ b/src/ap/dfs.c
+@@ -248,14 +248,15 @@ static int is_in_chanlist(struct hostapd_iface *iface,
+ */
+ static int dfs_find_channel(struct hostapd_iface *iface,
+ struct hostapd_channel_data **ret_chan,
+- int idx, enum dfs_channel_type type)
++ int n_chans, int idx, enum dfs_channel_type type)
+ {
+ struct hostapd_hw_modes *mode;
+ struct hostapd_channel_data *chan;
+- int i, channel_idx = 0, n_chans, n_chans1;
++ int i, channel_idx = 0, n_chans1;
+
+ mode = iface->current_mode;
+- n_chans = dfs_get_used_n_chans(iface, &n_chans1);
++ if (!n_chans)
++ n_chans = dfs_get_used_n_chans(iface, &n_chans1);
+
+ wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans);
+ for (i = 0; i < mode->num_channels; i++) {
+@@ -548,7 +549,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
+ return NULL;
+
+ /* Get the count first */
+- num_available_chandefs = dfs_find_channel(iface, NULL, 0, type);
++ num_available_chandefs = dfs_find_channel(iface, NULL, 0, 0, type);
+ wpa_printf(MSG_DEBUG, "DFS: num_available_chandefs=%d",
+ num_available_chandefs);
+ if (num_available_chandefs == 0)
+@@ -569,7 +570,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
+ return NULL;
+
+ chan_idx = _rand % num_available_chandefs;
+- dfs_find_channel(iface, &chan, chan_idx, type);
++ dfs_find_channel(iface, &chan, 0, chan_idx, type);
+ if (!chan) {
+ wpa_printf(MSG_DEBUG, "DFS: no random channel found");
+ return NULL;
+@@ -599,7 +600,7 @@ dfs_get_valid_channel(struct hostapd_iface *iface,
+ for (i = 0; i < num_available_chandefs - 1; i++) {
+ /* start from chan_idx + 1, end when chan_idx - 1 */
+ chan_idx2 = (chan_idx + 1 + i) % num_available_chandefs;
+- dfs_find_channel(iface, &chan2, chan_idx2, type);
++ dfs_find_channel(iface, &chan2, 0, chan_idx2, type);
+ if (chan2 && abs(chan2->chan - chan->chan) > 12) {
+ /* two channels are not adjacent */
+ sec_chan_idx_80p80 = chan2->chan;
+@@ -1302,6 +1303,9 @@ int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq,
+ set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
+ cf1, cf2, HOSTAPD_CHAN_DFS_USABLE);
+
++ if (dfs_use_radar_background(iface) && iface->radar_background.channel == -1)
++ hostpad_dfs_update_background_chain(iface);
++
+ return 0;
+ }
+
+@@ -1715,14 +1719,15 @@ int hostapd_handle_dfs_offload(struct hostapd_iface *iface)
+ }
+
+
+-int hostapd_is_dfs_overlap(struct hostapd_iface *iface, enum chan_width width,
+- int center_freq)
++int hostapd_dfs_get_target_state(struct hostapd_iface *iface, enum chan_width width,
++ int center_freq, int center_freq2)
+ {
+ struct hostapd_channel_data *chan;
+ struct hostapd_hw_modes *mode = iface->current_mode;
+- int half_width;
+- int res = 0;
++ int half_width, state, chan_state;
++ int upper, lower;
+ int i;
++ bool in_range;
+
+ if (!iface->conf->ieee80211h || !mode ||
+ mode->mode != HOSTAPD_MODE_IEEE80211A)
+@@ -1755,18 +1760,126 @@ int hostapd_is_dfs_overlap(struct hostapd_iface *iface, enum chan_width width,
+ if (!(chan->flag & HOSTAPD_CHAN_RADAR))
+ continue;
+
+- if ((chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+- HOSTAPD_CHAN_DFS_AVAILABLE)
+- continue;
++ upper = chan->freq + half_width;
++ lower = chan->freq - half_width;
++ in_range = (lower < center_freq && center_freq < upper) ||
++ (center_freq2 && (lower < center_freq2 && center_freq2 < upper));
++ if (in_range) {
++ chan_state = chan->flag & HOSTAPD_CHAN_DFS_MASK;
++ switch (chan_state) {
++ case HOSTAPD_CHAN_DFS_USABLE:
++ state = HOSTAPD_CHAN_DFS_USABLE;
++ break;
++ case HOSTAPD_CHAN_DFS_AVAILABLE:
++ if (state != HOSTAPD_CHAN_DFS_USABLE)
++ state = HOSTAPD_CHAN_DFS_AVAILABLE;
++ break;
++ case HOSTAPD_CHAN_DFS_UNAVAILABLE:
++ case HOSTAPD_CHAN_DFS_UNKNOWN:
++ default:
++ return HOSTAPD_CHAN_DFS_UNAVAILABLE;
++ }
++ }
++ }
+
+- if (center_freq - chan->freq < half_width &&
+- chan->freq - center_freq < half_width)
+- res++;
++ wpa_printf(MSG_DEBUG, "freq range (%d, %d) has DFS state %d",
++ center_freq - half_width, center_freq + half_width, state);
++
++ return state;
++}
++
++
++static struct hostapd_channel_data *
++dfs_get_csa_channel(struct hostapd_iface *iface,
++ int n_chans, int cur_center,
++ enum dfs_channel_type type)
++{
++ struct hostapd_channel_data *chan;
++ int avail_chan_num;
++ u32 _rand, idx;
++
++ if (os_get_random((u8 *)&_rand, sizeof(_rand)) < 0)
++ return NULL;
++
++ avail_chan_num = dfs_find_channel(iface, NULL, n_chans, 0, type);
++ if (!avail_chan_num)
++ return NULL;
++
++ idx = _rand % avail_chan_num;
++ dfs_find_channel(iface, &chan, n_chans, idx, type);
++ if (cur_center == chan->freq + (n_chans - 1) * 10) {
++ if (avail_chan_num == 1)
++ return NULL;
++
++ /* Get the next channel if the found channel is same as current channel */
++ idx = (idx + 1) % avail_chan_num;
++ dfs_find_channel(iface, &chan, n_chans, idx, type);
+ }
+
+- wpa_printf(MSG_DEBUG, "DFS CAC required: (%d, %d): in range: %s",
+- center_freq - half_width, center_freq + half_width,
+- res ? "yes" : "no");
++ return chan;
++}
+
+- return res;
++
++/*
++ * DFS handler for CSA
++ * 1 - update background radar with the filled setting
++ * 0 - background radar is not enabled / background radar remain at the same channel /
++ * disable background radar
++ */
++int hostapd_dfs_handle_csa(struct hostapd_iface *iface,
++ struct csa_settings *settings,
++ struct csa_settings *background_settings,
++ bool cac_required, bool bw_changed)
++{
++ struct hostapd_channel_data *chan;
++ struct hostapd_freq_params *freq_params = &settings->freq_params;
++ int center = settings->freq_params.center_freq1;
++ int background_center = 5000 + iface->radar_background.centr_freq_seg0_idx * 5;
++ int n_chans = settings->freq_params.bandwidth / 20;
++ bool update_background = false;
++
++ if (!dfs_use_radar_background(iface)) {
++ settings->cs_count = 5;
++ settings->block_tx = cac_required;
++ return 0;
++ }
++
++ if (!cac_required) {
++ if (!bw_changed && center != background_center)
++ return 0;
++ /* Update background radar due to bw change or channel overlapping */
++ update_background = true;
++ } else {
++ /*
++ * Get available channel for main channel.
++ * If no available channel for main channel, then perform
++ * the CAC of target channel on the main channel, and select
++ * an usable channel for background radar.
++ */
++ iface->radar_background.temp_ch = 1;
++ chan = dfs_get_csa_channel(iface, n_chans, 0, DFS_AVAILABLE);
++ if (!chan)
++ update_background = true;
++ }
++
++ if (update_background) {
++ chan = dfs_get_csa_channel(iface, n_chans, center, DFS_NO_CAC_YET);
++ if (!chan)
++ goto bkg_disable;
++ freq_params = &background_settings->freq_params;
++ iface->radar_background.temp_ch = 0;
++ }
++
++ memcpy(background_settings, settings, sizeof(*settings));
++ freq_params->freq = chan->freq;
++ freq_params->channel = chan->chan;
++ freq_params->sec_channel_offset = 1;
++ freq_params->center_freq1 = chan->freq + (n_chans - 1) * 10;
++ freq_params->center_freq2 = 0;
++
++ return 1;
++
++bkg_disable:
++ iface->radar_background.channel = -1;
++ return 0;
+ }
+diff --git a/src/ap/dfs.h b/src/ap/dfs.h
+index 1a0791f..0a7c25d 100644
+--- a/src/ap/dfs.h
++++ b/src/ap/dfs.h
+@@ -33,7 +33,12 @@ int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq,
+ int ht_enabled, int chan_offset, int chan_width,
+ int cf1, int cf2);
+ int hostapd_handle_dfs_offload(struct hostapd_iface *iface);
+-int hostapd_is_dfs_overlap(struct hostapd_iface *iface, enum chan_width width,
+- int center_freq);
++int hostapd_dfs_get_target_state(struct hostapd_iface *iface, enum chan_width width,
++ int center_freq, int center_freq2);
++int hostapd_dfs_handle_csa(struct hostapd_iface *iface,
++ struct csa_settings *settings,
++ struct csa_settings *background_settings,
++ bool cac_required, bool bw_changed);
++
+
+ #endif /* DFS_H */
+--
+2.18.0
+