[][MAC80211][hostapd][Fix ZWDFS issue in BW 160]
[Description]
Fix ZWDFS issue in BW 160.
When background radar is enabled and bandwidth is set to 160, AP will
fail to startup due to the lack of non-DFS channel.
Under this circumstance, AP should perform CAC itself, and the background
chain could also perform CAC simultaneously.
[Release-log]
N/A
Change-Id: I49ddc9c288a7abc7374c5dde88bb90f8cba0f522
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7269167
diff --git a/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0023-hostapd-mtk-Fix-ZWDFS-issue-in-BW-160.patch b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0023-hostapd-mtk-Fix-ZWDFS-issue-in-BW-160.patch
new file mode 100644
index 0000000..03e3517
--- /dev/null
+++ b/autobuild_mac80211_release/package/network/services/hostapd/patches/mtk-0023-hostapd-mtk-Fix-ZWDFS-issue-in-BW-160.patch
@@ -0,0 +1,210 @@
+From 0811b4e441d16f46edbd730b29da13e0a30b7b80 Mon Sep 17 00:00:00 2001
+From: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+Date: Mon, 20 Mar 2023 16:08:30 +0800
+Subject: [PATCH] hostapd: mtk: Fix ZWDFS issue in BW 160
+
+When background radar is enabled and bandwidth is set to 160, AP will
+fail to startup due to the lack of non-DFS channel.
+Under this circumstance, AP should perform CAC itself, and the background
+chain could also perform CAC simultaneously.
+
+Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
+---
+ src/ap/dfs.c | 98 ++++++++++++++++++++++++++++++++++++++++++----------
+ 1 file changed, 79 insertions(+), 19 deletions(-)
+
+diff --git a/src/ap/dfs.c b/src/ap/dfs.c
+index d082fe0..d688ecb 100644
+--- a/src/ap/dfs.c
++++ b/src/ap/dfs.c
+@@ -69,15 +69,22 @@ static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1)
+ static int dfs_channel_available(struct hostapd_channel_data *chan,
+ enum dfs_channel_type type)
+ {
++ int dfs_status = chan->flag & HOSTAPD_CHAN_DFS_MASK;
++
++ if (chan->flag & HOSTAPD_CHAN_DISABLED)
++ return -1;
++
+ if (type == DFS_NO_CAC_YET) {
+ /* Select only radar channel where CAC has not been
+ * performed yet
+ */
+- if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
+- (chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+- HOSTAPD_CHAN_DFS_USABLE)
++ if (!(chan->flag & HOSTAPD_CHAN_RADAR))
++ return 0;
++
++ if (dfs_status == HOSTAPD_CHAN_DFS_USABLE)
+ return 1;
+- return 0;
++
++ return -1;
+ }
+
+ /*
+@@ -86,16 +93,14 @@ static int dfs_channel_available(struct hostapd_channel_data *chan,
+ * channel for CSA, unless they are available for immediate use.
+ */
+ if (type == DFS_AVAILABLE && (chan->flag & HOSTAPD_CHAN_RADAR) &&
+- ((chan->flag & HOSTAPD_CHAN_DFS_MASK) !=
+- HOSTAPD_CHAN_DFS_AVAILABLE))
+- return 0;
++ (dfs_status != HOSTAPD_CHAN_DFS_AVAILABLE))
++ return -1;
+
+- if (chan->flag & HOSTAPD_CHAN_DISABLED)
+- return 0;
+ if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
+- ((chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
+- HOSTAPD_CHAN_DFS_UNAVAILABLE))
+- return 0;
++ ((dfs_status == HOSTAPD_CHAN_DFS_UNAVAILABLE) ||
++ (dfs_status == HOSTAPD_CHAN_DFS_UNKNOWN)))
++ return -1;
++
+ return 1;
+ }
+
+@@ -167,7 +172,7 @@ static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
+ enum dfs_channel_type type)
+ {
+ struct hostapd_channel_data *first_chan, *chan;
+- int i;
++ int i, available = 0, ret = 0;
+ u32 bw = num_chan_to_bw(num_chans);
+
+ if (first_chan_idx + num_chans > mode->num_channels) {
+@@ -203,14 +208,17 @@ static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
+ return 0;
+ }
+
+- if (!dfs_channel_available(chan, type)) {
++ ret = dfs_channel_available(chan, type);
++ if (ret < 0) {
+ wpa_printf(MSG_DEBUG, "DFS: channel not available %d",
+ first_chan->freq + i * 20);
+ return 0;
+ }
++
++ available |= ret;
+ }
+
+- return 1;
++ return available;
+ }
+
+
+@@ -826,8 +834,12 @@ static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
+ */
+ int hostapd_handle_dfs(struct hostapd_iface *iface)
+ {
++ struct hostapd_channel_data *channel;
+ int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1;
+- int skip_radar = 0;
++ int sec = 0, skip_radar = 0;
++ u8 cf1 = 0, cf2 = 0;
++ bool use_radar_background = dfs_use_radar_background(iface);
++ enum dfs_channel_type channel_type = DFS_NO_CAC_YET;
+
+ if (is_6ghz_freq(iface->freq))
+ return 1;
+@@ -890,7 +902,7 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
+ /* Finally start CAC */
+ hostapd_set_state(iface, HAPD_IFACE_DFS);
+ wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz%s", iface->freq,
+- dfs_use_radar_background(iface) ? " (background)" : "");
++ use_radar_background ? " (background)" : "");
+ wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
+ "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds",
+ iface->freq,
+@@ -900,6 +912,16 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
+ hostapd_get_oper_centr_freq_seg1_idx(iface->conf),
+ iface->dfs_cac_ms / 1000);
+
++ if (use_radar_background) {
++ channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, DFS_AVAILABLE);
++ /*
++ * AP cannot get any random available channel.
++ * Let AP and dedicated radar chain both perform CAC.
++ */
++ if (!channel)
++ use_radar_background = false;
++ }
++
+ res = hostapd_start_dfs_cac(
+ iface, iface->conf->hw_mode, iface->freq, iface->conf->channel,
+ iface->conf->ieee80211n, iface->conf->ieee80211ac,
+@@ -908,14 +930,14 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
+ hostapd_get_oper_chwidth(iface->conf),
+ hostapd_get_oper_centr_freq_seg0_idx(iface->conf),
+ hostapd_get_oper_centr_freq_seg1_idx(iface->conf),
+- dfs_use_radar_background(iface));
++ use_radar_background);
+
+ if (res) {
+ wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res);
+ return -1;
+ }
+
+- if (dfs_use_radar_background(iface)) {
++ if (use_radar_background) {
+ /* Cache background radar parameters. */
+ iface->radar_background.channel = iface->conf->channel;
+ iface->radar_background.secondary_channel =
+@@ -936,6 +958,35 @@ int hostapd_handle_dfs(struct hostapd_iface *iface)
+
+ iface->radar_background.temp_ch = 1;
+ return 1;
++ } else if (dfs_use_radar_background(iface)) {
++ if (iface->dfs_domain == HOSTAPD_DFS_REGION_ETSI)
++ channel_type = DFS_ANY_CHANNEL;
++
++ channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, channel_type);
++
++ if (!channel ||
++ (channel->chan == iface->conf->channel &&
++ cf1 == hostapd_get_oper_centr_freq_seg0_idx(iface->conf) &&
++ cf2 == hostapd_get_oper_centr_freq_seg1_idx(iface->conf))) {
++ wpa_printf(MSG_ERROR, "Background radar could not get valid channel\n");
++ iface->radar_background.channel = -1;
++ return 0;
++ }
++
++ hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
++ channel->freq, channel->chan,
++ iface->conf->ieee80211n,
++ iface->conf->ieee80211ac,
++ iface->conf->ieee80211ax,
++ iface->conf->ieee80211be,
++ sec, hostapd_get_oper_chwidth(iface->conf),
++ cf1, cf2, true);
++
++ iface->radar_background.channel = channel->chan;
++ iface->radar_background.freq = channel->freq;
++ iface->radar_background.secondary_channel = sec;
++ iface->radar_background.centr_freq_seg0_idx = cf1;
++ iface->radar_background.centr_freq_seg1_idx = cf2;
+ }
+
+ return 0;
+@@ -1185,6 +1236,15 @@ int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
+ hostapd_setup_interface_complete(iface, 0);
+ iface->cac_started = 0;
+ }
++
++ /*
++ * When background radar is enabled but the CAC completion
++ * is not received from the background chain.
++ * Then, reset radar background chain.
++ */
++ if (dfs_use_radar_background(iface) &&
++ iface->radar_background.channel == -1)
++ hostpad_dfs_update_background_chain(iface);
+ }
+ } else if (hostapd_dfs_is_background_event(iface, freq)) {
+ iface->radar_background.cac_started = 0;
+--
+2.18.0
+