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cfg80211: regulatory: handle S1G channels 

S1G channels have a minimum bandwidth of 1Mhz, and there
is a 1:1 mapping of allowed bandwidth to channel number.

Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
Link: https://lore.kernel.org/r/20200908190323.15814-4-thomas@adapt-ip.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Pedersen 2020-09-08 12:03:04 -07:00 committed by Johannes Berg
parent d65a977087
commit 68dbad8c65
1 changed files with 58 additions and 12 deletions
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70
net/wireless/reg.c
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@ -1617,9 +1617,11 @@ __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
{
const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
const struct ieee80211_reg_rule *reg_rule = NULL;
const u32 bws[] = {0, 1, 2, 4, 5, 8, 10, 16, 20};
int i = ARRAY_SIZE(bws) - 1;
u32 bw;
for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
for (bw = MHZ_TO_KHZ(bws[i]); bw >= min_bw; bw = MHZ_TO_KHZ(bws[i--])) {
reg_rule = freq_reg_info_regd(center_freq, regd, bw);
if (!IS_ERR(reg_rule))
return reg_rule;
@ -1631,7 +1633,9 @@ __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
u32 center_freq)
{
return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
u32 min_bw = center_freq < MHZ_TO_KHZ(1000) ? 1 : 20;
return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(min_bw));
}
EXPORT_SYMBOL(freq_reg_info);
@ -1659,6 +1663,7 @@ static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd
{
const struct ieee80211_freq_range *freq_range = NULL;
u32 max_bandwidth_khz, center_freq_khz, bw_flags = 0;
bool is_s1g = chan->band == NL80211_BAND_S1GHZ;
freq_range = &reg_rule->freq_range;
@ -1678,16 +1683,57 @@ static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd
MHZ_TO_KHZ(20)))
bw_flags |= IEEE80211_CHAN_NO_20MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(10))
bw_flags |= IEEE80211_CHAN_NO_10MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(20))
bw_flags |= IEEE80211_CHAN_NO_20MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(40))
bw_flags |= IEEE80211_CHAN_NO_HT40;
if (max_bandwidth_khz < MHZ_TO_KHZ(80))
bw_flags |= IEEE80211_CHAN_NO_80MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(160))
bw_flags |= IEEE80211_CHAN_NO_160MHZ;
if (is_s1g) {
/* S1G is strict about non overlapping channels. We can
* calculate which bandwidth is allowed per channel by finding
* the largest bandwidth which cleanly divides the freq_range.
*/
int edge_offset;
int ch_bw = max_bandwidth_khz;
while (ch_bw) {
edge_offset = (center_freq_khz - ch_bw / 2) -
freq_range->start_freq_khz;
if (edge_offset % ch_bw == 0) {
switch (KHZ_TO_MHZ(ch_bw)) {
case 1:
bw_flags |= IEEE80211_CHAN_1MHZ;
break;
case 2:
bw_flags |= IEEE80211_CHAN_2MHZ;
break;
case 4:
bw_flags |= IEEE80211_CHAN_4MHZ;
break;
case 8:
bw_flags |= IEEE80211_CHAN_8MHZ;
break;
case 16:
bw_flags |= IEEE80211_CHAN_16MHZ;
break;
default:
/* If we got here, no bandwidths fit on
* this frequency, ie. band edge.
*/
bw_flags |= IEEE80211_CHAN_DISABLED;
break;
}
break;
}
ch_bw /= 2;
}
} else {
if (max_bandwidth_khz < MHZ_TO_KHZ(10))
bw_flags |= IEEE80211_CHAN_NO_10MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(20))
bw_flags |= IEEE80211_CHAN_NO_20MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(40))
bw_flags |= IEEE80211_CHAN_NO_HT40;
if (max_bandwidth_khz < MHZ_TO_KHZ(80))
bw_flags |= IEEE80211_CHAN_NO_80MHZ;
if (max_bandwidth_khz < MHZ_TO_KHZ(160))
bw_flags |= IEEE80211_CHAN_NO_160MHZ;
}
return bw_flags;
}