From abdd0985a36189ef2cc0e393b027276e86137ace Mon Sep 17 00:00:00 2001
From: Aditya Kumar Singh <quic_adisi@quicinc.com>
Date: Tue, 11 Apr 2023 20:08:49 +0200
Subject: [PATCH] ath11k: remove intersection support for regulatory rules

Currently, regulatory rules from new country settings is intersected with
rules from default country settings(during initialisation) in order to prevent
users to bypass their default country settings such as power limits, channel
flags, etc.

However, the country setting in the BDF will take higher higher precendence
and FW will protect it. Therefore, there is no need to handle intersection
on the driver side now.

Remove regulatory rules intersection logic support.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
---
 drivers/net/wireless/ath/ath11k/reg.c | 168 +++-----------------------
 drivers/net/wireless/ath/ath11k/reg.h |   2 +-
 drivers/net/wireless/ath/ath11k/wmi.c |  24 +---
 3 files changed, 16 insertions(+), 178 deletions(-)

--- a/drivers/net/wireless/ath/ath11k/reg.c
+++ b/drivers/net/wireless/ath/ath11k/reg.c
@@ -361,134 +361,6 @@ static u32 ath11k_map_fw_phy_flags(u32 p
 	return flags;
 }
 
-static bool
-ath11k_reg_can_intersect(struct ieee80211_reg_rule *rule1,
-			 struct ieee80211_reg_rule *rule2)
-{
-	u32 start_freq1, end_freq1;
-	u32 start_freq2, end_freq2;
-
-	start_freq1 = rule1->freq_range.start_freq_khz;
-	start_freq2 = rule2->freq_range.start_freq_khz;
-
-	end_freq1 = rule1->freq_range.end_freq_khz;
-	end_freq2 = rule2->freq_range.end_freq_khz;
-
-	if ((start_freq1 >= start_freq2 &&
-	     start_freq1 < end_freq2) ||
-	    (start_freq2 > start_freq1 &&
-	     start_freq2 < end_freq1))
-		return true;
-
-	/* TODO: Should we restrict intersection feasibility
-	 *  based on min bandwidth of the intersected region also,
-	 *  say the intersected rule should have a  min bandwidth
-	 * of 20MHz?
-	 */
-
-	return false;
-}
-
-static void ath11k_reg_intersect_rules(struct ieee80211_reg_rule *rule1,
-				       struct ieee80211_reg_rule *rule2,
-				       struct ieee80211_reg_rule *new_rule)
-{
-	u32 start_freq1, end_freq1;
-	u32 start_freq2, end_freq2;
-	u32 freq_diff, max_bw;
-
-	start_freq1 = rule1->freq_range.start_freq_khz;
-	start_freq2 = rule2->freq_range.start_freq_khz;
-
-	end_freq1 = rule1->freq_range.end_freq_khz;
-	end_freq2 = rule2->freq_range.end_freq_khz;
-
-	new_rule->freq_range.start_freq_khz = max_t(u32, start_freq1,
-						    start_freq2);
-	new_rule->freq_range.end_freq_khz = min_t(u32, end_freq1, end_freq2);
-
-	freq_diff = new_rule->freq_range.end_freq_khz -
-			new_rule->freq_range.start_freq_khz;
-	max_bw = min_t(u32, rule1->freq_range.max_bandwidth_khz,
-		       rule2->freq_range.max_bandwidth_khz);
-	new_rule->freq_range.max_bandwidth_khz = min_t(u32, max_bw, freq_diff);
-
-	new_rule->power_rule.max_antenna_gain =
-		min_t(u32, rule1->power_rule.max_antenna_gain,
-		      rule2->power_rule.max_antenna_gain);
-
-	new_rule->power_rule.max_eirp = min_t(u32, rule1->power_rule.max_eirp,
-					      rule2->power_rule.max_eirp);
-
-	/* Use the flags of both the rules */
-	new_rule->flags = rule1->flags | rule2->flags;
-
-	if ((rule1->flags & NL80211_RRF_PSD) && (rule2->flags & NL80211_RRF_PSD))
-		new_rule->psd = min_t(s8, rule1->psd, rule2->psd);
-	else
-		new_rule->flags &= ~NL80211_RRF_PSD;
-
-	/* To be safe, lts use the max cac timeout of both rules */
-	new_rule->dfs_cac_ms = max_t(u32, rule1->dfs_cac_ms,
-				     rule2->dfs_cac_ms);
-}
-
-static struct ieee80211_regdomain *
-ath11k_regd_intersect(struct ieee80211_regdomain *default_regd,
-		      struct ieee80211_regdomain *curr_regd)
-{
-	u8 num_old_regd_rules, num_curr_regd_rules, num_new_regd_rules;
-	struct ieee80211_reg_rule *old_rule, *curr_rule, *new_rule;
-	struct ieee80211_regdomain *new_regd = NULL;
-	u8 i, j, k;
-
-	num_old_regd_rules = default_regd->n_reg_rules;
-	num_curr_regd_rules = curr_regd->n_reg_rules;
-	num_new_regd_rules = 0;
-
-	/* Find the number of intersecting rules to allocate new regd memory */
-	for (i = 0; i < num_old_regd_rules; i++) {
-		old_rule = default_regd->reg_rules + i;
-		for (j = 0; j < num_curr_regd_rules; j++) {
-			curr_rule = curr_regd->reg_rules + j;
-
-			if (ath11k_reg_can_intersect(old_rule, curr_rule))
-				num_new_regd_rules++;
-		}
-	}
-
-	if (!num_new_regd_rules)
-		return NULL;
-
-	new_regd = kzalloc(sizeof(*new_regd) + (num_new_regd_rules *
-			sizeof(struct ieee80211_reg_rule)),
-			GFP_ATOMIC);
-
-	if (!new_regd)
-		return NULL;
-
-	/* We set the new country and dfs region directly and only trim
-	 * the freq, power, antenna gain by intersecting with the
-	 * default regdomain. Also MAX of the dfs cac timeout is selected.
-	 */
-	new_regd->n_reg_rules = num_new_regd_rules;
-	memcpy(new_regd->alpha2, curr_regd->alpha2, sizeof(new_regd->alpha2));
-	new_regd->dfs_region = curr_regd->dfs_region;
-	new_rule = new_regd->reg_rules;
-
-	for (i = 0, k = 0; i < num_old_regd_rules; i++) {
-		old_rule = default_regd->reg_rules + i;
-		for (j = 0; j < num_curr_regd_rules; j++) {
-			curr_rule = curr_regd->reg_rules + j;
-
-			if (ath11k_reg_can_intersect(old_rule, curr_rule))
-				ath11k_reg_intersect_rules(old_rule, curr_rule,
-							   (new_rule + k++));
-		}
-	}
-	return new_regd;
-}
-
 static const char *
 ath11k_reg_get_regdom_str(enum nl80211_dfs_regions dfs_region)
 {
@@ -639,11 +511,11 @@ ath11k_reg_ap_pwr_convert(enum ieee80211
 
 struct ieee80211_regdomain *
 ath11k_reg_build_regd(struct ath11k_base *ab,
-		      struct cur_regulatory_info *reg_info, bool intersect,
+		      struct cur_regulatory_info *reg_info,
 		      enum wmi_vdev_type vdev_type,
 		      enum ieee80211_ap_reg_power power_type)
 {
-	struct ieee80211_regdomain *tmp_regd, *default_regd, *new_regd = NULL;
+	struct ieee80211_regdomain *new_regd = NULL;
 	struct cur_reg_rule *reg_rule, *reg_rule_6ghz;
 	u8 i = 0, j = 0, k = 0;
 	u8 num_rules;
@@ -686,26 +558,26 @@ ath11k_reg_build_regd(struct ath11k_base
 	}
 
 	if (!num_rules)
-		goto ret;
+		return new_regd;
 
 	/* Add max additional rules to accommodate weather radar band */
 	if (reg_info->dfs_region == ATH11K_DFS_REG_ETSI)
 		num_rules += 2;
 
-	tmp_regd =  kzalloc(sizeof(*tmp_regd) +
+	new_regd =  kzalloc(sizeof(*new_regd) +
 			(num_rules * sizeof(struct ieee80211_reg_rule)),
 			GFP_ATOMIC);
-	if (!tmp_regd)
-		goto ret;
+	if (!new_regd)
+		return new_regd;
 
-	memcpy(tmp_regd->alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
+	memcpy(new_regd->alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
 	memcpy(alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
 	alpha2[2] = '\0';
-	tmp_regd->dfs_region = ath11k_map_fw_dfs_region(reg_info->dfs_region);
+	new_regd->dfs_region = ath11k_map_fw_dfs_region(reg_info->dfs_region);
 
 	ath11k_dbg(ab, ATH11K_DBG_REG,
 		   "Country %s, CFG Regdomain %s FW Regdomain %d, num_reg_rules %d\n",
-		   alpha2, ath11k_reg_get_regdom_str(tmp_regd->dfs_region),
+		   alpha2, ath11k_reg_get_regdom_str(new_regd->dfs_region),
 		   reg_info->dfs_region, num_rules);
 	/* Update reg_rules[] below. Firmware is expected to
 	 * send these rules in order(2 GHz rules first and then 5 GHz)
@@ -744,7 +616,7 @@ ath11k_reg_build_regd(struct ath11k_base
 		flags |= ath11k_map_fw_reg_flags(reg_rule->flags);
 		flags |= ath11k_map_fw_phy_flags(reg_info->phybitmap);
 
-		ath11k_reg_update_rule(tmp_regd->reg_rules + i,
+		ath11k_reg_update_rule(new_regd->reg_rules + i,
 				       reg_rule->start_freq,
 				       reg_rule->end_freq, max_bw,
 				       reg_rule->ant_gain, reg_rule->reg_power,
@@ -759,7 +631,7 @@ ath11k_reg_build_regd(struct ath11k_base
 		    reg_info->dfs_region == ATH11K_DFS_REG_ETSI &&
 		    (reg_rule->end_freq > ETSI_WEATHER_RADAR_BAND_LOW &&
 		    reg_rule->start_freq < ETSI_WEATHER_RADAR_BAND_HIGH)){
-			ath11k_reg_update_weather_radar_band(ab, tmp_regd,
+			ath11k_reg_update_weather_radar_band(ab, new_regd,
 							     reg_rule, &i,
 							     flags, max_bw);
 			continue;
@@ -770,51 +642,23 @@ ath11k_reg_build_regd(struct ath11k_base
 				   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d) (%d, %d)\n",
 				   i + 1, reg_rule->start_freq, reg_rule->end_freq,
 				   max_bw, reg_rule->ant_gain, reg_rule->reg_power,
-				   tmp_regd->reg_rules[i].dfs_cac_ms, flags,
+				   new_regd->reg_rules[i].dfs_cac_ms, flags,
 				   reg_rule->psd_flag, reg_rule->psd_eirp);
 		} else {
 			ath11k_dbg(ab, ATH11K_DBG_REG,
 				   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
 				   i + 1, reg_rule->start_freq, reg_rule->end_freq,
 				   max_bw, reg_rule->ant_gain, reg_rule->reg_power,
-				   tmp_regd->reg_rules[i].dfs_cac_ms,
+				   new_regd->reg_rules[i].dfs_cac_ms,
 				   flags);
 		}
 	}
 
-	tmp_regd->n_reg_rules = i;
+	new_regd->n_reg_rules = i;
 
-	if (intersect) {
-		default_regd = ab->default_regd[reg_info->phy_id];
-
-		/* Get a new regd by intersecting the received regd with
-		 * our default regd.
-		 */
-		new_regd = ath11k_regd_intersect(default_regd, tmp_regd);
-		kfree(tmp_regd);
-		if (!new_regd) {
-			ath11k_warn(ab, "Unable to create intersected regdomain\n");
-			goto ret;
-		}
-	} else {
-		new_regd = tmp_regd;
-	}
-
-ret:
 	return new_regd;
 }
 
-static bool ath11k_reg_is_world_alpha(char *alpha)
-{
-	if (alpha[0] == '0' && alpha[1] == '0')
-		return true;
-
-	if (alpha[0] == 'n' && alpha[1] == 'a')
-		return true;
-
-	return false;
-}
-
 static enum wmi_vdev_type ath11k_reg_get_ar_vdev_type(struct ath11k *ar)
 {
 	struct ath11k_vif *arvif;
@@ -837,7 +681,6 @@ int ath11k_reg_handle_chan_list(struct a
 				enum ieee80211_ap_reg_power power_type)
 {
 	struct ieee80211_regdomain *regd;
-	bool intersect = false;
 	int pdev_idx;
 	struct ath11k *ar;
 	enum wmi_vdev_type vdev_type;
@@ -889,24 +732,14 @@ int ath11k_reg_handle_chan_list(struct a
 		    (char *)reg_info->alpha2, 2))
 		goto retfail;
 
-	/* Intersect new rules with default regd if a new country setting was
-	 * requested, i.e a default regd was already set during initialization
-	 * and the regd coming from this event has a valid country info.
-	 */
-	if (ab->default_regd[pdev_idx] &&
-	    !ath11k_reg_is_world_alpha((char *)
-		ab->default_regd[pdev_idx]->alpha2) &&
-	    !ath11k_reg_is_world_alpha((char *)reg_info->alpha2))
-		intersect = true;
-
 	ar = ab->pdevs[pdev_idx].ar;
 	vdev_type = ath11k_reg_get_ar_vdev_type(ar);
 
 	ath11k_dbg(ab, ATH11K_DBG_WMI,
-		   "wmi handle chan list power type %d vdev type %d intersect %d\n",
-		   power_type, vdev_type, intersect);
+		   "wmi handle chan list power type %d vdev type %d\n",
+		   power_type, vdev_type);
 
-	regd = ath11k_reg_build_regd(ab, reg_info, intersect, vdev_type, power_type);
+	regd = ath11k_reg_build_regd(ab, reg_info, vdev_type, power_type);
 	if (!regd) {
 		ath11k_warn(ab, "failed to build regd from reg_info\n");
 		goto fallback;
--- a/drivers/net/wireless/ath/ath11k/reg.h
+++ b/drivers/net/wireless/ath/ath11k/reg.h
@@ -35,7 +35,7 @@ void ath11k_reg_free(struct ath11k_base
 void ath11k_regd_update_work(struct work_struct *work);
 struct ieee80211_regdomain *
 ath11k_reg_build_regd(struct ath11k_base *ab,
-		      struct cur_regulatory_info *reg_info, bool intersect,
+		      struct cur_regulatory_info *reg_info,
 		      enum wmi_vdev_type vdev_type,
 		      enum ieee80211_ap_reg_power power_type);
 int ath11k_regd_update(struct ath11k *ar);
