Commit 97524820 authored by Janusz Dziedzic's avatar Janusz Dziedzic Committed by Johannes Berg
Browse files

cfg80211: regulatory introduce maximum bandwidth calculation 



In case we will get regulatory request with rule
where max_bandwidth_khz is set to 0 handle this
case as a special one.

If max_bandwidth_khz == 0 we should calculate maximum
available bandwidth base on all frequency contiguous rules.
In case we need auto calculation we just have to set:

country PL: DFS-ETSI
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ AUTO), (N/A, 20)
        (5250 - 5330 @ AUTO), (N/A, 20), DFS
        (5490 - 5710 @ 80), (N/A, 27), DFS

This mean we will calculate maximum bw for rules where
AUTO (N/A) were set, 160MHz (5330 - 5170) in example above.
So we will get:
        (5170 - 5250 @ 160), (N/A, 20)
        (5250 - 5330 @ 160), (N/A, 20), DFS

In other case:
country FR: DFS-ETSI
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ AUTO), (N/A, 20)
        (5250 - 5330 @ 80), (N/A, 20), DFS
        (5490 - 5710 @ 80), (N/A, 27), DFS

We will get 80MHz (5250 - 5170):
        (5170 - 5250 @ 80), (N/A, 20)
        (5250 - 5330 @ 80), (N/A, 20), DFS

Base on this calculations we will set correct channel
bandwidth flags (eg. IEEE80211_CHAN_NO_80MHZ).

We don't need any changes in CRDA or internal regulatory.

Signed-off-by: default avatarJanusz Dziedzic <janusz.dziedzic@tieto.com>
[extend nl80211 description a bit, fix typo]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 9e0e2961

include/uapi/linux/nl80211.h

+4 −1
Original line number Diff line number Diff line
@@ -2437,7 +2437,10 @@ enum nl80211_reg_type { 
 * 	in KHz. This is not a center a frequency but an actual regulatory

 * 	band edge.

 * @NL80211_ATTR_FREQ_RANGE_MAX_BW: maximum allowed bandwidth for this

 * 	frequency range, in KHz.

 *	frequency range, in KHz. If not present or 0, maximum available

 *	bandwidth should be calculated base on contiguous rules and wider

 *	channels will be allowed to cross multiple contiguous/overlapping

 *	frequency ranges.

 * @NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN: the maximum allowed antenna gain

 * 	for a given frequency range. The value is in mBi (100 * dBi).

 * 	If you don't have one then don't send this.

net/wireless/nl80211.c

+10 −5
Original line number Diff line number Diff line
@@ -4626,8 +4626,6 @@ static int parse_reg_rule(struct nlattr *tb[], 
		return -EINVAL;

	if (!tb[NL80211_ATTR_FREQ_RANGE_END])

		return -EINVAL;

	if (!tb[NL80211_ATTR_FREQ_RANGE_MAX_BW])

		return -EINVAL;

	if (!tb[NL80211_ATTR_POWER_RULE_MAX_EIRP])

		return -EINVAL;
@@ -4637,6 +4635,7 @@ static int parse_reg_rule(struct nlattr *tb[], 
		nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_START]);

	freq_range->end_freq_khz =

		nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_END]);

	if (tb[NL80211_ATTR_FREQ_RANGE_MAX_BW])

		freq_range->max_bandwidth_khz =

			nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
@@ -5108,6 +5107,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info) 
		const struct ieee80211_reg_rule *reg_rule;

		const struct ieee80211_freq_range *freq_range;

		const struct ieee80211_power_rule *power_rule;

		unsigned int max_bandwidth_khz;



		reg_rule = &regdom->reg_rules[i];

		freq_range = &reg_rule->freq_range;
@@ -5117,6 +5117,11 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info) 
		if (!nl_reg_rule)

			goto nla_put_failure_rcu;



		max_bandwidth_khz = freq_range->max_bandwidth_khz;

		if (!max_bandwidth_khz)

			max_bandwidth_khz = reg_get_max_bandwidth(regdom,

								  reg_rule);



		if (nla_put_u32(msg, NL80211_ATTR_REG_RULE_FLAGS,

				reg_rule->flags) ||

		    nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_START,
@@ -5124,7 +5129,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info) 
		    nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_END,

				freq_range->end_freq_khz) ||

		    nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_MAX_BW,

				freq_range->max_bandwidth_khz) ||

				max_bandwidth_khz) ||

		    nla_put_u32(msg, NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN,

				power_rule->max_antenna_gain) ||

		    nla_put_u32(msg, NL80211_ATTR_POWER_RULE_MAX_EIRP,

net/wireless/reg.c

+114 −16
Original line number Diff line number Diff line
@@ -538,6 +538,61 @@ static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy) 
	return get_cfg80211_regdom();

}



unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,

				   const struct ieee80211_reg_rule *rule)

{

	const struct ieee80211_freq_range *freq_range = &rule->freq_range;

	const struct ieee80211_freq_range *freq_range_tmp;

	const struct ieee80211_reg_rule *tmp;

	u32 start_freq, end_freq, idx, no;



	for (idx = 0; idx < rd->n_reg_rules; idx++)

		if (rule == &rd->reg_rules[idx])

			break;



	if (idx == rd->n_reg_rules)

		return 0;



	/* get start_freq */

	no = idx;



	while (no) {

		tmp = &rd->reg_rules[--no];

		freq_range_tmp = &tmp->freq_range;



		if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)

			break;



		if (freq_range_tmp->max_bandwidth_khz)

			break;



		freq_range = freq_range_tmp;

	}



	start_freq = freq_range->start_freq_khz;



	/* get end_freq */

	freq_range = &rule->freq_range;

	no = idx;



	while (no < rd->n_reg_rules - 1) {

		tmp = &rd->reg_rules[++no];

		freq_range_tmp = &tmp->freq_range;



		if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)

			break;



		if (freq_range_tmp->max_bandwidth_khz)

			break;



		freq_range = freq_range_tmp;

	}



	end_freq = freq_range->end_freq_khz;



	return end_freq - start_freq;

}



/* Sanity check on a regulatory rule */

static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)

{
@@ -646,7 +701,9 @@ reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1, 
 * Helper for regdom_intersect(), this does the real

 * mathematical intersection fun

 */

static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,

static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,

			       const struct ieee80211_regdomain *rd2,

			       const struct ieee80211_reg_rule *rule1,

			       const struct ieee80211_reg_rule *rule2,

			       struct ieee80211_reg_rule *intersected_rule)

{
@@ -654,7 +711,7 @@ static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1, 
	struct ieee80211_freq_range *freq_range;

	const struct ieee80211_power_rule *power_rule1, *power_rule2;

	struct ieee80211_power_rule *power_rule;

	u32 freq_diff;

	u32 freq_diff, max_bandwidth1, max_bandwidth2;



	freq_range1 = &rule1->freq_range;

	freq_range2 = &rule2->freq_range;
@@ -668,8 +725,24 @@ static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1, 
					 freq_range2->start_freq_khz);

	freq_range->end_freq_khz = min(freq_range1->end_freq_khz,

				       freq_range2->end_freq_khz);

	freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,

					    freq_range2->max_bandwidth_khz);



	max_bandwidth1 = freq_range1->max_bandwidth_khz;

	max_bandwidth2 = freq_range2->max_bandwidth_khz;



	/*

	 * In case max_bandwidth1 == 0 and max_bandwith2 == 0 set

	 * output bandwidth as 0 (auto calculation). Next we will

	 * calculate this correctly in handle_channel function.

	 * In other case calculate output bandwidth here.

	 */

	if (max_bandwidth1 || max_bandwidth2) {

		if (!max_bandwidth1)

			max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);

		if (!max_bandwidth2)

			max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);

	}



	freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);



	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;

	if (freq_range->max_bandwidth_khz > freq_diff)
@@ -729,7 +802,8 @@ regdom_intersect(const struct ieee80211_regdomain *rd1, 
		rule1 = &rd1->reg_rules[x];

		for (y = 0; y < rd2->n_reg_rules; y++) {

			rule2 = &rd2->reg_rules[y];

			if (!reg_rules_intersect(rule1, rule2, &dummy_rule))

			if (!reg_rules_intersect(rd1, rd2, rule1, rule2,

						 &dummy_rule))

				num_rules++;

		}

	}
@@ -754,7 +828,8 @@ regdom_intersect(const struct ieee80211_regdomain *rd1, 
			 * a memcpy()

			 */

			intersected_rule = &rd->reg_rules[rule_idx];

			r = reg_rules_intersect(rule1, rule2, intersected_rule);

			r = reg_rules_intersect(rd1, rd2, rule1, rule2,

						intersected_rule);

			/*

			 * No need to memset here the intersected rule here as

			 * we're not using the stack anymore
@@ -909,6 +984,8 @@ static void handle_channel(struct wiphy *wiphy, 
	const struct ieee80211_freq_range *freq_range = NULL;

	struct wiphy *request_wiphy = NULL;

	struct regulatory_request *lr = get_last_request();

	const struct ieee80211_regdomain *regd;

	u32 max_bandwidth_khz;



	request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
@@ -950,11 +1027,18 @@ static void handle_channel(struct wiphy *wiphy, 
	power_rule = &reg_rule->power_rule;

	freq_range = &reg_rule->freq_range;



	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))

	max_bandwidth_khz = freq_range->max_bandwidth_khz;

	/* Check if auto calculation requested */

	if (!max_bandwidth_khz) {

		regd = reg_get_regdomain(wiphy);

		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);

	}



	if (max_bandwidth_khz < MHZ_TO_KHZ(40))

		bw_flags = IEEE80211_CHAN_NO_HT40;

	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))

	if (max_bandwidth_khz < MHZ_TO_KHZ(80))

		bw_flags |= IEEE80211_CHAN_NO_80MHZ;

	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))

	if (max_bandwidth_khz < MHZ_TO_KHZ(160))

		bw_flags |= IEEE80211_CHAN_NO_160MHZ;



	if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
@@ -1340,6 +1424,7 @@ static void handle_channel_custom(struct wiphy *wiphy, 
	const struct ieee80211_reg_rule *reg_rule = NULL;

	const struct ieee80211_power_rule *power_rule = NULL;

	const struct ieee80211_freq_range *freq_range = NULL;

	u32 max_bandwidth_khz;



	reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),

				      regd);
@@ -1357,11 +1442,16 @@ static void handle_channel_custom(struct wiphy *wiphy, 
	power_rule = &reg_rule->power_rule;

	freq_range = &reg_rule->freq_range;



	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))

	max_bandwidth_khz = freq_range->max_bandwidth_khz;

	/* Check if auto calculation requested */

	if (!max_bandwidth_khz)

		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);



	if (max_bandwidth_khz < MHZ_TO_KHZ(40))

		bw_flags = IEEE80211_CHAN_NO_HT40;

	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))

	if (max_bandwidth_khz < MHZ_TO_KHZ(80))

		bw_flags |= IEEE80211_CHAN_NO_80MHZ;

	if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))

	if (max_bandwidth_khz < MHZ_TO_KHZ(160))

		bw_flags |= IEEE80211_CHAN_NO_160MHZ;



	chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
@@ -2155,6 +2245,7 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd) 
	const struct ieee80211_reg_rule *reg_rule = NULL;

	const struct ieee80211_freq_range *freq_range = NULL;

	const struct ieee80211_power_rule *power_rule = NULL;

	char bw[32];



	pr_info("  (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
@@ -2163,22 +2254,29 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd) 
		freq_range = &reg_rule->freq_range;

		power_rule = &reg_rule->power_rule;



		if (!freq_range->max_bandwidth_khz)

			snprintf(bw, 32, "%d KHz, AUTO",

				 reg_get_max_bandwidth(rd, reg_rule));

		else

			snprintf(bw, 32, "%d KHz",

				 freq_range->max_bandwidth_khz);



		/*

		 * There may not be documentation for max antenna gain

		 * in certain regions

		 */

		if (power_rule->max_antenna_gain)

			pr_info("  (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",

			pr_info("  (%d KHz - %d KHz @ %s), (%d mBi, %d mBm)\n",

				freq_range->start_freq_khz,

				freq_range->end_freq_khz,

				freq_range->max_bandwidth_khz,

				bw,

				power_rule->max_antenna_gain,

				power_rule->max_eirp);

		else

			pr_info("  (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",

			pr_info("  (%d KHz - %d KHz @ %s), (N/A, %d mBm)\n",

				freq_range->start_freq_khz,

				freq_range->end_freq_khz,

				freq_range->max_bandwidth_khz,

				bw,

				power_rule->max_eirp);

	}

}

net/wireless/reg.h

+2 −0
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ int __init regulatory_init(void); 
void regulatory_exit(void);



int set_regdom(const struct ieee80211_regdomain *rd);

unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,

				   const struct ieee80211_reg_rule *rule);



bool reg_last_request_cell_base(void);

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