nl80211: add Guard Interval support for set_bitrate_mask

Allow to force SGI, LGI.
Mainly for test purpose.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d10ba3a..d5e57bf 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1776,6 +1776,7 @@ struct cfg80211_bitrate_mask {
                u32 legacy;
                u8 ht_mcs[IEEE80211_HT_MCS_MASK_LEN];
                u16 vht_mcs[NL80211_VHT_NSS_MAX];
+               enum nl80211_txrate_gi gi;
        } control[IEEE80211_NUM_BANDS];
 };
 /**

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 9a86c8b..53e56cf 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3156,6 +3156,7 @@ enum nl80211_key_attributes {
  *     in an array of MCS numbers.
  * @NL80211_TXRATE_VHT: VHT rates allowed for TX rate selection,
  *     see &struct nl80211_txrate_vht
+ * @NL80211_TXRATE_GI: configure GI, see &enum nl80211_txrate_gi
  * @__NL80211_TXRATE_AFTER_LAST: internal
  * @NL80211_TXRATE_MAX: highest TX rate attribute
  */
@@ -3164,6 +3165,7 @@ enum nl80211_tx_rate_attributes {
        NL80211_TXRATE_LEGACY,
        NL80211_TXRATE_HT,
        NL80211_TXRATE_VHT,
+       NL80211_TXRATE_GI,
 
        /* keep last */
        __NL80211_TXRATE_AFTER_LAST,
@@ -3181,6 +3183,12 @@ struct nl80211_txrate_vht {
        __u16 mcs[NL80211_VHT_NSS_MAX];
 };
 
+enum nl80211_txrate_gi {
+       NL80211_TXRATE_DEFAULT_GI,
+       NL80211_TXRATE_FORCE_SGI,
+       NL80211_TXRATE_FORCE_LGI,
+};
+
 /**
  * enum nl80211_band - Frequency band
  * @NL80211_BAND_2GHZ: 2.4 GHz ISM band

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 09b6da8..a3515eb 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7447,6 +7447,7 @@ static const struct nla_policy nl80211_txattr_policy[NL80211_TXRATE_MAX + 1] = {
        [NL80211_TXRATE_HT] = { .type = NLA_BINARY,
                                .len = NL80211_MAX_SUPP_HT_RATES },
        [NL80211_TXRATE_VHT] = { .len = sizeof(struct nl80211_txrate_vht)},
+       [NL80211_TXRATE_GI] = { .type = NLA_U8 },
 };
 
 static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
@@ -7527,6 +7528,12 @@ static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
                                        mask.control[band].vht_mcs))
                                return -EINVAL;
                }
+               if (tb[NL80211_TXRATE_GI]) {
+                       mask.control[band].gi =
+                               nla_get_u8(tb[NL80211_TXRATE_GI]);
+                       if (mask.control[band].gi > NL80211_TXRATE_FORCE_LGI)
+                               return -EINVAL;
+               }
 
                if (mask.control[band].legacy == 0) {
                        /* don't allow empty legacy rates if HT or VHT