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: Janusz Dziedzic <janusz.dziedzic@tieto.com>
[extend nl80211 description a bit, fix typo]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Janusz Dziedzic
Johannes Berg
Родитель
9e0e29615a
Коммит
9752482083
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@ -2437,7 +2437,10 @@ enum nl80211_reg_type {
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* in KHz. This is not a center a frequency but an actual regulatory
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* band edge.
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* @NL80211_ATTR_FREQ_RANGE_MAX_BW: maximum allowed bandwidth for this
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* frequency range, in KHz.
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* frequency range, in KHz. If not present or 0, maximum available
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* bandwidth should be calculated base on contiguous rules and wider
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* channels will be allowed to cross multiple contiguous/overlapping
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* frequency ranges.
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* @NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN: the maximum allowed antenna gain
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* for a given frequency range. The value is in mBi (100 * dBi).
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* If you don't have one then don't send this.
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@ -4626,8 +4626,6 @@ static int parse_reg_rule(struct nlattr *tb[],
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return -EINVAL;
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if (!tb[NL80211_ATTR_FREQ_RANGE_END])
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return -EINVAL;
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if (!tb[NL80211_ATTR_FREQ_RANGE_MAX_BW])
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return -EINVAL;
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if (!tb[NL80211_ATTR_POWER_RULE_MAX_EIRP])
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return -EINVAL;
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@ -4637,8 +4635,9 @@ static int parse_reg_rule(struct nlattr *tb[],
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nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_START]);
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freq_range->end_freq_khz =
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nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_END]);
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freq_range->max_bandwidth_khz =
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nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
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if (tb[NL80211_ATTR_FREQ_RANGE_MAX_BW])
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freq_range->max_bandwidth_khz =
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nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
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power_rule->max_eirp =
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nla_get_u32(tb[NL80211_ATTR_POWER_RULE_MAX_EIRP]);
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@ -5108,6 +5107,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
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const struct ieee80211_reg_rule *reg_rule;
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const struct ieee80211_freq_range *freq_range;
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const struct ieee80211_power_rule *power_rule;
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unsigned int max_bandwidth_khz;
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reg_rule = ®dom->reg_rules[i];
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freq_range = ®_rule->freq_range;
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@ -5117,6 +5117,11 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
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if (!nl_reg_rule)
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goto nla_put_failure_rcu;
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max_bandwidth_khz = freq_range->max_bandwidth_khz;
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if (!max_bandwidth_khz)
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max_bandwidth_khz = reg_get_max_bandwidth(regdom,
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reg_rule);
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if (nla_put_u32(msg, NL80211_ATTR_REG_RULE_FLAGS,
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reg_rule->flags) ||
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nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_START,
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@ -5124,7 +5129,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
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nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_END,
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freq_range->end_freq_khz) ||
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nla_put_u32(msg, NL80211_ATTR_FREQ_RANGE_MAX_BW,
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freq_range->max_bandwidth_khz) ||
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max_bandwidth_khz) ||
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nla_put_u32(msg, NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN,
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power_rule->max_antenna_gain) ||
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nla_put_u32(msg, NL80211_ATTR_POWER_RULE_MAX_EIRP,
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@ -538,6 +538,61 @@ static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
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return get_cfg80211_regdom();
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}
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unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
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const struct ieee80211_reg_rule *rule)
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{
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const struct ieee80211_freq_range *freq_range = &rule->freq_range;
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const struct ieee80211_freq_range *freq_range_tmp;
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const struct ieee80211_reg_rule *tmp;
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u32 start_freq, end_freq, idx, no;
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for (idx = 0; idx < rd->n_reg_rules; idx++)
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if (rule == &rd->reg_rules[idx])
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break;
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if (idx == rd->n_reg_rules)
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return 0;
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/* get start_freq */
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no = idx;
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while (no) {
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tmp = &rd->reg_rules[--no];
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freq_range_tmp = &tmp->freq_range;
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if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
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break;
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if (freq_range_tmp->max_bandwidth_khz)
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break;
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freq_range = freq_range_tmp;
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}
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start_freq = freq_range->start_freq_khz;
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/* get end_freq */
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freq_range = &rule->freq_range;
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no = idx;
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while (no < rd->n_reg_rules - 1) {
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tmp = &rd->reg_rules[++no];
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freq_range_tmp = &tmp->freq_range;
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if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
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break;
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if (freq_range_tmp->max_bandwidth_khz)
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break;
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freq_range = freq_range_tmp;
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}
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end_freq = freq_range->end_freq_khz;
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return end_freq - start_freq;
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}
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/* Sanity check on a regulatory rule */
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static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
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{
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@ -646,7 +701,9 @@ reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
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* Helper for regdom_intersect(), this does the real
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* mathematical intersection fun
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*/
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static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
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static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
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const struct ieee80211_regdomain *rd2,
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const struct ieee80211_reg_rule *rule1,
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const struct ieee80211_reg_rule *rule2,
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struct ieee80211_reg_rule *intersected_rule)
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{
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@ -654,7 +711,7 @@ static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
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struct ieee80211_freq_range *freq_range;
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const struct ieee80211_power_rule *power_rule1, *power_rule2;
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struct ieee80211_power_rule *power_rule;
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u32 freq_diff;
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u32 freq_diff, max_bandwidth1, max_bandwidth2;
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freq_range1 = &rule1->freq_range;
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freq_range2 = &rule2->freq_range;
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@ -668,8 +725,24 @@ static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
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freq_range2->start_freq_khz);
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freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
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freq_range2->end_freq_khz);
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freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
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freq_range2->max_bandwidth_khz);
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max_bandwidth1 = freq_range1->max_bandwidth_khz;
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max_bandwidth2 = freq_range2->max_bandwidth_khz;
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/*
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* In case max_bandwidth1 == 0 and max_bandwith2 == 0 set
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* output bandwidth as 0 (auto calculation). Next we will
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* calculate this correctly in handle_channel function.
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* In other case calculate output bandwidth here.
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*/
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if (max_bandwidth1 || max_bandwidth2) {
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if (!max_bandwidth1)
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max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
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if (!max_bandwidth2)
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max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
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}
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freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
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freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
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if (freq_range->max_bandwidth_khz > freq_diff)
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@ -729,7 +802,8 @@ regdom_intersect(const struct ieee80211_regdomain *rd1,
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rule1 = &rd1->reg_rules[x];
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for (y = 0; y < rd2->n_reg_rules; y++) {
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rule2 = &rd2->reg_rules[y];
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if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
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if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
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&dummy_rule))
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num_rules++;
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}
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}
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@ -754,7 +828,8 @@ regdom_intersect(const struct ieee80211_regdomain *rd1,
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* a memcpy()
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*/
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intersected_rule = &rd->reg_rules[rule_idx];
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r = reg_rules_intersect(rule1, rule2, intersected_rule);
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r = reg_rules_intersect(rd1, rd2, rule1, rule2,
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intersected_rule);
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/*
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* No need to memset here the intersected rule here as
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* we're not using the stack anymore
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@ -909,6 +984,8 @@ static void handle_channel(struct wiphy *wiphy,
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const struct ieee80211_freq_range *freq_range = NULL;
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struct wiphy *request_wiphy = NULL;
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struct regulatory_request *lr = get_last_request();
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const struct ieee80211_regdomain *regd;
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u32 max_bandwidth_khz;
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request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
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@ -950,11 +1027,18 @@ static void handle_channel(struct wiphy *wiphy,
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power_rule = ®_rule->power_rule;
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freq_range = ®_rule->freq_range;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
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max_bandwidth_khz = freq_range->max_bandwidth_khz;
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/* Check if auto calculation requested */
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if (!max_bandwidth_khz) {
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regd = reg_get_regdomain(wiphy);
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max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
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}
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if (max_bandwidth_khz < MHZ_TO_KHZ(40))
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bw_flags = IEEE80211_CHAN_NO_HT40;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
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if (max_bandwidth_khz < MHZ_TO_KHZ(80))
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bw_flags |= IEEE80211_CHAN_NO_80MHZ;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
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if (max_bandwidth_khz < MHZ_TO_KHZ(160))
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bw_flags |= IEEE80211_CHAN_NO_160MHZ;
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if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
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@ -1340,6 +1424,7 @@ static void handle_channel_custom(struct wiphy *wiphy,
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const struct ieee80211_reg_rule *reg_rule = NULL;
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const struct ieee80211_power_rule *power_rule = NULL;
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const struct ieee80211_freq_range *freq_range = NULL;
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u32 max_bandwidth_khz;
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reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
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regd);
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@ -1357,11 +1442,16 @@ static void handle_channel_custom(struct wiphy *wiphy,
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power_rule = ®_rule->power_rule;
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freq_range = ®_rule->freq_range;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
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max_bandwidth_khz = freq_range->max_bandwidth_khz;
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/* Check if auto calculation requested */
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if (!max_bandwidth_khz)
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max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
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if (max_bandwidth_khz < MHZ_TO_KHZ(40))
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bw_flags = IEEE80211_CHAN_NO_HT40;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
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if (max_bandwidth_khz < MHZ_TO_KHZ(80))
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bw_flags |= IEEE80211_CHAN_NO_80MHZ;
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if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
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if (max_bandwidth_khz < MHZ_TO_KHZ(160))
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bw_flags |= IEEE80211_CHAN_NO_160MHZ;
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chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
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@ -2155,6 +2245,7 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd)
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const struct ieee80211_reg_rule *reg_rule = NULL;
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const struct ieee80211_freq_range *freq_range = NULL;
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const struct ieee80211_power_rule *power_rule = NULL;
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char bw[32];
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pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
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@ -2163,22 +2254,29 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd)
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freq_range = ®_rule->freq_range;
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power_rule = ®_rule->power_rule;
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if (!freq_range->max_bandwidth_khz)
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snprintf(bw, 32, "%d KHz, AUTO",
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reg_get_max_bandwidth(rd, reg_rule));
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else
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snprintf(bw, 32, "%d KHz",
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freq_range->max_bandwidth_khz);
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/*
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* There may not be documentation for max antenna gain
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* in certain regions
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*/
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if (power_rule->max_antenna_gain)
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pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
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pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm)\n",
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freq_range->start_freq_khz,
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freq_range->end_freq_khz,
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freq_range->max_bandwidth_khz,
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bw,
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power_rule->max_antenna_gain,
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power_rule->max_eirp);
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else
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pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
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pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm)\n",
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freq_range->start_freq_khz,
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freq_range->end_freq_khz,
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freq_range->max_bandwidth_khz,
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bw,
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power_rule->max_eirp);
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}
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}
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@ -34,6 +34,8 @@ int __init regulatory_init(void);
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void regulatory_exit(void);
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int set_regdom(const struct ieee80211_regdomain *rd);
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unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
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const struct ieee80211_reg_rule *rule);
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bool reg_last_request_cell_base(void);
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