[PATCHv9 2/6] nl80211: Add support to configure TID specific retry configuration

[Tamizh Chelvam <tamizhr@codeaurora.org>]

From: Tamizh chelvam <tamizhr@codeaurora.org>

This patch adds support to configure per TID retry configuration
through the NL80211_TID_CONFIG_ATTR_RETRY_SHORT and
NL80211_TID_CONFIG_ATTR_RETRY_LONG attributes. This TID specific
retry configuration will have more precedence than phy level
configuration.

Signed-off-by: Tamizh chelvam <tamizhr@codeaurora.org>
---
 include/net/cfg80211.h       |   12 ++++++++++++
 include/uapi/linux/nl80211.h |   28 +++++++++++++++++++++++++++-
 net/wireless/nl80211.c       |   36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c5d1eb1..c2dec5e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -600,6 +600,10 @@ struct cfg80211_chan_def {
 
 enum ieee80211_tid_conf_mask {
 	IEEE80211_TID_CONF_NOACK	= BIT(NL80211_TID_CONFIG_ATTR_NOACK),
+	IEEE80211_TID_CONF_RETRY_SHORT	=
+				BIT(NL80211_TID_CONFIG_ATTR_RETRY_SHORT),
+	IEEE80211_TID_CONF_RETRY_LONG	=
+				BIT(NL80211_TID_CONFIG_ATTR_RETRY_LONG),
 };
 
 /**
@@ -610,12 +614,16 @@ enum ieee80211_tid_conf_mask {
  * @tid_conf_mask: bitmap indicating which parameter changed
  *	see &enum ieee80211_tid_conf_mask
  * @noack: noack configuration value for the TID
+ * @retry_long: retry count value
+ * @retry_short: retry count value
  */
 struct ieee80211_tid_cfg {
 	bool config_override;
 	u8 tid;
 	u32 tid_conf_mask;
 	enum nl80211_tid_config noack;
+	int retry_long;
+	int retry_short;
 };
 
 /**
@@ -4583,6 +4591,8 @@ struct cfg80211_pmsr_capabilities {
  *	@support_mbssid must be set for this to have any effect.
  *
  * @pmsr_capa: peer measurement capabilities
+ * @max_data_retry_count: Maximum limit can be configured as retry count
+ *	for a TID.
  */
 struct wiphy {
 	/* assign these fields before you register the wiphy */
@@ -4727,6 +4737,8 @@ struct wiphy {
 
 	const struct cfg80211_pmsr_capabilities *pmsr_capa;
 
+	u8 max_data_retry_count;
+
 	char priv[0] __aligned(NETDEV_ALIGN);
 };
 
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index df1ebdc..cdd259b 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2427,6 +2427,8 @@ enum nl80211_commands {
  *
  * @NL80211_ATTR_TID_CONFIG: TID specific configuration in a
  *	nested attribute with &enum nl80211_tid_config_attr sub-attributes.
+ * @NL80211_ATTR_MAX_RETRY_COUNT: The upper limit for the retry count
+ *	configuration that the driver can accept.
  *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
@@ -2893,6 +2895,7 @@ enum nl80211_attrs {
 	NL80211_ATTR_VLAN_ID,
 
 	NL80211_ATTR_TID_CONFIG,
+	NL80211_ATTR_MAX_RETRY_COUNT,
 
 	/* add attributes here, update the policy in nl80211.c */
 
@@ -4754,12 +4757,24 @@ enum nl80211_tid_config {
  * @NL80211_TID_CONFIG_ATTR_NOACK: Configure ack policy for the TID.
  *	specified in %NL80211_TID_CONFIG_ATTR_TID. see %enum nl80211_tid_config.
  *	Its type is u8.
+ * @NL80211_TID_CONFIG_ATTR_RETRY_SHORT: Number of retries used with data frame
+ *	transmission, user-space sets this configuration in
+ *	&NL80211_CMD_SET_TID_CONFIG. It is u8 type, min value is 1 and
+ *	the max value should be advertised by the driver through
+ *	max_data_retry_count.
+ * @NL80211_TID_CONFIG_ATTR_RETRY_LONG: Number of retries used with data frame
+ *	transmission, user-space sets this configuration in
+ *	&NL80211_CMD_SET_TID_CONFIG. Its type is u8, min value is 1 and
+ *	the max value should be advertised by the driver through
+ *	max_data_retry_count.
  */
 enum nl80211_tid_config_attr {
 	__NL80211_TID_CONFIG_ATTR_INVALID,
 	NL80211_TID_CONFIG_ATTR_OVERRIDE,
 	NL80211_TID_CONFIG_ATTR_TIDS,
 	NL80211_TID_CONFIG_ATTR_NOACK,
+	NL80211_TID_CONFIG_ATTR_RETRY_SHORT,
+	NL80211_TID_CONFIG_ATTR_RETRY_LONG,
 
 	/* keep last */
 	__NL80211_TID_CONFIG_ATTR_AFTER_LAST,
@@ -5584,7 +5599,14 @@ enum nl80211_feature_flags {
  *	policy functionality.
  * @NL80211_EXT_FEATURE_PER_STA_NOACK_CONFIG: Driver supports STA specific NoAck
  *	policy functionality.
- *
+ * @NL80211_EXT_FEATURE_PER_TID_RETRY_SHORT_CONFIG: Driver supports per TID data
+ *	retry_short count functionality.
+ * @NL80211_EXT_FEATURE_PER_STA_RETRY_SHORT_CONFIG: Driver supports STA specific
+ *	data retry_long count functionality.
+ * @NL80211_EXT_FEATURE_PER_TID_RETRY_LONG_CONFIG: Driver supports per TID data
+ *	retry_long count functionality.
+ * @NL80211_EXT_FEATURE_PER_STA_RETRY_LONG_CONFIG: Driver supports STA specific
+ *	data retry_long count functionality.
  *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@@ -5634,6 +5656,10 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_VLAN_OFFLOAD,
 	NL80211_EXT_FEATURE_PER_TID_NOACK_CONFIG,
 	NL80211_EXT_FEATURE_PER_STA_NOACK_CONFIG,
+	NL80211_EXT_FEATURE_PER_TID_RETRY_SHORT_CONFIG,
+	NL80211_EXT_FEATURE_PER_STA_RETRY_SHORT_CONFIG,
+	NL80211_EXT_FEATURE_PER_TID_RETRY_LONG_CONFIG,
+	NL80211_EXT_FEATURE_PER_STA_RETRY_LONG_CONFIG,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d20c832..bb26e3d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -327,6 +327,8 @@ static int validate_ie_attr(const struct nlattr *attr,
 	[NL80211_TID_CONFIG_ATTR_TIDS] = { .type = NLA_U8 },
 	[NL80211_TID_CONFIG_ATTR_NOACK] =
 			NLA_POLICY_MAX(NLA_U8, NL80211_TID_CONFIG_DISABLE),
+	[NL80211_TID_CONFIG_ATTR_RETRY_SHORT] = NLA_POLICY_MIN(NLA_U8, 1),
+	[NL80211_TID_CONFIG_ATTR_RETRY_LONG] = NLA_POLICY_MIN(NLA_U8, 1),
 };
 
 const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
@@ -2453,6 +2455,12 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
 			    rdev->wiphy.akm_suites))
 			goto nla_put_failure;
 
+		if (rdev->wiphy.max_data_retry_count) {
+			if (nla_put_u8(msg, NL80211_ATTR_MAX_RETRY_COUNT,
+				       rdev->wiphy.max_data_retry_count))
+				goto nla_put_failure;
+		}
+
 		/* done */
 		state->split_start = 0;
 		break;
@@ -13874,6 +13882,34 @@ static int parse_tid_conf(struct cfg80211_registered_device *rdev,
 			nla_get_u8(attrs[NL80211_TID_CONFIG_ATTR_NOACK]);
 	}
 
+	if (attrs[NL80211_TID_CONFIG_ATTR_RETRY_SHORT]) {
+		err = nl80211_check_tid_config_support(rdev, extack, peer,
+						       attrs, tid_conf,
+						       RETRY_SHORT);
+		if (err)
+			return err;
+
+		tid_conf->retry_short =
+			nla_get_u8(attrs[NL80211_TID_CONFIG_ATTR_RETRY_SHORT]);
+
+		if (tid_conf->retry_short > rdev->wiphy.max_data_retry_count)
+			return -EINVAL;
+	}
+
+	if (attrs[NL80211_TID_CONFIG_ATTR_RETRY_LONG]) {
+		err = nl80211_check_tid_config_support(rdev, extack, peer,
+						       attrs, tid_conf,
+						       RETRY_LONG);
+		if (err)
+			return err;
+
+		tid_conf->retry_long =
+			nla_get_u8(attrs[NL80211_TID_CONFIG_ATTR_RETRY_LONG]);
+
+		if (tid_conf->retry_long > rdev->wiphy.max_data_retry_count)
+			return -EINVAL;
+	}
+
 	return 0;
 }
 
-- 
1.7.9.5