cfg80211: enable dynack through nl80211

Enable ACK timeout estimation algorithm (dynack) using mac80211
set_coverage_class API. Dynack is activated passing coverage class equals to -1
to lower drivers and it is automatically disabled setting valid value for
coverage class.
Define NL80211_ATTR_WIPHY_DYN_ACK flag attribute to enable dynack from
userspace. In order to activate dynack NL80211_FEATURE_ACKTO_ESTIMATION feature
flag must be set by lower drivers to indicate dynack capability.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index a887eeb..0d17ec9 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1805,6 +1805,7 @@ struct cfg80211_connect_params {
  * @WIPHY_PARAM_FRAG_THRESHOLD: wiphy->frag_threshold has changed
  * @WIPHY_PARAM_RTS_THRESHOLD: wiphy->rts_threshold has changed
  * @WIPHY_PARAM_COVERAGE_CLASS: coverage class changed
+ * @WIPHY_PARAM_DYN_ACK: dynack has been enabled
  */
 enum wiphy_params_flags {
        WIPHY_PARAM_RETRY_SHORT         = 1 << 0,
@@ -1812,6 +1813,7 @@ enum wiphy_params_flags {
        WIPHY_PARAM_FRAG_THRESHOLD      = 1 << 2,
        WIPHY_PARAM_RTS_THRESHOLD       = 1 << 3,
        WIPHY_PARAM_COVERAGE_CLASS      = 1 << 4,
+       WIPHY_PARAM_DYN_ACK             = 1 << 5,
 };
 
 /*

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index de69d3d..29c4399 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1605,6 +1605,12 @@ enum nl80211_commands {
  *     association request. In addition, it must also set the RRM capability
  *     flag in the association request's Capability Info field.
  *
+ * @NL80211_ATTR_WIPHY_DYN_ACK: flag attribute used to enable ACK timeout
+ *     estimation algorithm (dynack). In order to activate dynack
+ *     %NL80211_FEATURE_ACKTO_ESTIMATION feature flag must be set by lower
+ *     drivers to indicate dynack capability. Dynack is automatically disabled
+ *     setting valid value for coverage class.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1949,6 +1955,8 @@ enum nl80211_attrs {
 
        NL80211_ATTR_USE_RRM,
 
+       NL80211_ATTR_WIPHY_DYN_ACK,
+
        /* add attributes here, update the policy in nl80211.c */
 
        __NL80211_ATTR_AFTER_LAST,
@@ -3991,6 +3999,9 @@ enum nl80211_ap_sme_features {
  *     current tx power value into the TPC Report IE in the spectrum
  *     management TPC Report action frame, and in the Radio Measurement Link
  *     Measurement Report action frame.
+ * @NL80211_FEATURE_ACKTO_ESTIMATION: This driver supports dynamic ACK timeout
+ *     estimation (dynack). %NL80211_ATTR_WIPHY_DYN_ACK flag attribute is used
+ *     to enable dynack.
  */
 enum nl80211_feature_flags {
        NL80211_FEATURE_SK_TX_STATUS                    = 1 << 0,
@@ -4016,6 +4027,7 @@ enum nl80211_feature_flags {
        NL80211_FEATURE_WFA_TPC_IE_IN_PROBES            = 1 << 20,
        NL80211_FEATURE_QUIET                           = 1 << 21,
        NL80211_FEATURE_TX_POWER_INSERTION              = 1 << 22,
+       NL80211_FEATURE_ACKTO_ESTIMATION                = 1 << 23,
 };
 
 /**

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 459dc27..cf178d2 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -226,6 +226,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
        [NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },
        [NL80211_ATTR_WIPHY_RTS_THRESHOLD] = { .type = NLA_U32 },
        [NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
+       [NL80211_ATTR_WIPHY_DYN_ACK] = { .type = NLA_FLAG },
 
        [NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
        [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
@@ -2239,11 +2240,21 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
        }
 
        if (info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
+               if (info->attrs[NL80211_ATTR_WIPHY_DYN_ACK])
+                       return -EINVAL;
+
                coverage_class = nla_get_u8(
                        info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
                changed |= WIPHY_PARAM_COVERAGE_CLASS;
        }
 
+       if (info->attrs[NL80211_ATTR_WIPHY_DYN_ACK]) {
+               if (!(rdev->wiphy.features & NL80211_FEATURE_ACKTO_ESTIMATION))
+                       return -EOPNOTSUPP;
+
+               changed |= WIPHY_PARAM_DYN_ACK;
+       }
+
        if (changed) {
                u8 old_retry_short, old_retry_long;
                u32 old_frag_threshold, old_rts_threshold;