nl80211: add support for 320MHz channel limitation

Add support to advertise drivers or regulatory limitations on 320 MHz
channels to userspace.

Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
Co-authored-by: Karthikeyan Periyasamy <quic_periyasia@quicinc.com>
Signed-off-by: Karthikeyan Periyasamy <quic_periyasia@quicinc.com>
Co-authored-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Link: https://lore.kernel.org/r/1640163883-12696-6-git-send-email-quic_vjakkam@quicinc.com
Link: https://lore.kernel.org/r/20220214163009.175289-3-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index d0ba70e..6a338da 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3997,6 +3997,8 @@ enum nl80211_wmm_rule {
  *     on this channel in current regulatory domain.
  * @NL80211_FREQUENCY_ATTR_16MHZ: 16 MHz operation is allowed
  *     on this channel in current regulatory domain.
+ * @NL80211_FREQUENCY_ATTR_NO_320MHZ: any 320 MHz channel using this channel
+ *     as the primary or any of the secondary channels isn't possible
  * @NL80211_FREQUENCY_ATTR_MAX: highest frequency attribute number
  *     currently defined
  * @__NL80211_FREQUENCY_ATTR_AFTER_LAST: internal use
@@ -4033,6 +4035,7 @@ enum nl80211_frequency_attr {
        NL80211_FREQUENCY_ATTR_4MHZ,
        NL80211_FREQUENCY_ATTR_8MHZ,
        NL80211_FREQUENCY_ATTR_16MHZ,
+       NL80211_FREQUENCY_ATTR_NO_320MHZ,
 
        /* keep last */
        __NL80211_FREQUENCY_ATTR_AFTER_LAST,
@@ -4231,6 +4234,7 @@ enum nl80211_sched_scan_match_attr {
  * @NL80211_RRF_NO_80MHZ: 80MHz operation not allowed
  * @NL80211_RRF_NO_160MHZ: 160MHz operation not allowed
  * @NL80211_RRF_NO_HE: HE operation not allowed
+ * @NL80211_RRF_NO_320MHZ: 320MHz operation not allowed
  */
 enum nl80211_reg_rule_flags {
        NL80211_RRF_NO_OFDM             = 1<<0,
@@ -4249,6 +4253,7 @@ enum nl80211_reg_rule_flags {
        NL80211_RRF_NO_80MHZ            = 1<<15,
        NL80211_RRF_NO_160MHZ           = 1<<16,
        NL80211_RRF_NO_HE               = 1<<17,
+       NL80211_RRF_NO_320MHZ           = 1<<18,
 };
 
 #define NL80211_RRF_PASSIVE_SCAN       NL80211_RRF_NO_IR

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a267e83..7edf0bb 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1156,6 +1156,9 @@ static int nl80211_msg_put_channel(struct sk_buff *msg, struct wiphy *wiphy,
                if ((chan->flags & IEEE80211_CHAN_16MHZ) &&
                    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_16MHZ))
                        goto nla_put_failure;
+               if ((chan->flags & IEEE80211_CHAN_NO_320MHZ) &&
+                   nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_320MHZ))
+                       goto nla_put_failure;
        }
 
        if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index ec25924..c76cd97 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1238,6 +1238,8 @@ unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
 {
        unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
 
+       if (rule->flags & NL80211_RRF_NO_320MHZ)
+               bw = min_t(unsigned int, bw, MHZ_TO_KHZ(160));
        if (rule->flags & NL80211_RRF_NO_160MHZ)
                bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
        if (rule->flags & NL80211_RRF_NO_80MHZ)
@@ -1611,6 +1613,8 @@ static u32 map_regdom_flags(u32 rd_flags)
                channel_flags |= IEEE80211_CHAN_NO_160MHZ;
        if (rd_flags & NL80211_RRF_NO_HE)
                channel_flags |= IEEE80211_CHAN_NO_HE;
+       if (rd_flags & NL80211_RRF_NO_320MHZ)
+               channel_flags |= IEEE80211_CHAN_NO_320MHZ;
        return channel_flags;
 }
 
@@ -1773,6 +1777,8 @@ static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd
                        bw_flags |= IEEE80211_CHAN_NO_80MHZ;
                if (max_bandwidth_khz < MHZ_TO_KHZ(160))
                        bw_flags |= IEEE80211_CHAN_NO_160MHZ;
+               if (max_bandwidth_khz < MHZ_TO_KHZ(320))
+                       bw_flags |= IEEE80211_CHAN_NO_320MHZ;
        }
        return bw_flags;
 }