cfg80211: Expose TXQ stats and parameters to userspace

This adds support for exporting the mac80211 TXQ stats via nl80211 by
way of a nested TXQ stats attribute, as well as for configuring the
quantum and limits that were previously only changeable through debugfs.

This commit adds just the nl80211 API, a subsequent commit adds support to
mac80211 itself.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5e888ec62811..8db6071b6063 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1080,6 +1080,37 @@ struct sta_bss_parameters {
 };
 
 /**
+ * struct cfg80211_txq_stats - TXQ statistics for this TID
+ * @filled: bitmap of flags using the bits of &enum nl80211_txq_stats to
+ *	indicate the relevant values in this struct are filled
+ * @backlog_bytes: total number of bytes currently backlogged
+ * @backlog_packets: total number of packets currently backlogged
+ * @flows: number of new flows seen
+ * @drops: total number of packets dropped
+ * @ecn_marks: total number of packets marked with ECN CE
+ * @overlimit: number of drops due to queue space overflow
+ * @overmemory: number of drops due to memory limit overflow
+ * @collisions: number of hash collisions
+ * @tx_bytes: total number of bytes dequeued
+ * @tx_packets: total number of packets dequeued
+ * @max_flows: maximum number of flows supported
+ */
+struct cfg80211_txq_stats {
+	u32 filled;
+	u32 backlog_bytes;
+	u32 backlog_packets;
+	u32 flows;
+	u32 drops;
+	u32 ecn_marks;
+	u32 overlimit;
+	u32 overmemory;
+	u32 collisions;
+	u32 tx_bytes;
+	u32 tx_packets;
+	u32 max_flows;
+};
+
+/**
  * struct cfg80211_tid_stats - per-TID statistics
  * @filled: bitmap of flags using the bits of &enum nl80211_tid_stats to
  *	indicate the relevant values in this struct are filled
@@ -1088,6 +1119,7 @@ struct sta_bss_parameters {
  * @tx_msdu_retries: number of retries (not counting the first) for
  *	transmitted MSDUs
  * @tx_msdu_failed: number of failed transmitted MSDUs
+ * @txq_stats: TXQ statistics
  */
 struct cfg80211_tid_stats {
 	u32 filled;
@@ -1095,6 +1127,7 @@ struct cfg80211_tid_stats {
 	u64 tx_msdu;
 	u64 tx_msdu_retries;
 	u64 tx_msdu_failed;
+	struct cfg80211_txq_stats txq_stats;
 };
 
 #define IEEE80211_MAX_CHAINS	4
@@ -2204,6 +2237,9 @@ enum cfg80211_connect_params_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
+ * @WIPHY_PARAM_TXQ_LIMIT: TXQ packet limit has been changed
+ * @WIPHY_PARAM_TXQ_MEMORY_LIMIT: TXQ memory limit has been changed
+ * @WIPHY_PARAM_TXQ_QUANTUM: TXQ scheduler quantum
  */
 enum wiphy_params_flags {
 	WIPHY_PARAM_RETRY_SHORT		= 1 << 0,
@@ -2212,6 +2248,9 @@ enum wiphy_params_flags {
 	WIPHY_PARAM_RTS_THRESHOLD	= 1 << 3,
 	WIPHY_PARAM_COVERAGE_CLASS	= 1 << 4,
 	WIPHY_PARAM_DYN_ACK		= 1 << 5,
+	WIPHY_PARAM_TXQ_LIMIT		= 1 << 6,
+	WIPHY_PARAM_TXQ_MEMORY_LIMIT	= 1 << 7,
+	WIPHY_PARAM_TXQ_QUANTUM		= 1 << 8,
 };
 
 /**
@@ -2964,6 +3003,9 @@ struct cfg80211_external_auth_params {
  *
  * @set_multicast_to_unicast: configure multicast to unicast conversion for BSS
  *
+ * @get_txq_stats: Get TXQ stats for interface or phy. If wdev is %NULL, this
+ *      function should return phy stats, and interface stats otherwise.
+ *
  * @set_pmk: configure the PMK to be used for offloaded 802.1X 4-Way handshake.
  *	If not deleted through @del_pmk the PMK remains valid until disconnect
  *	upon which the driver should clear it.
@@ -3265,6 +3307,10 @@ struct cfg80211_ops {
 					    struct net_device *dev,
 					    const bool enabled);
 
+	int	(*get_txq_stats)(struct wiphy *wiphy,
+				 struct wireless_dev *wdev,
+				 struct cfg80211_txq_stats *txqstats);
+
 	int	(*set_pmk)(struct wiphy *wiphy, struct net_device *dev,
 			   const struct cfg80211_pmk_conf *conf);
 	int	(*del_pmk)(struct wiphy *wiphy, struct net_device *dev,
@@ -3943,6 +3989,10 @@ struct wiphy {
 
 	u8 nan_supported_bands;
 
+	u32 txq_limit;
+	u32 txq_memory_limit;
+	u32 txq_quantum;
+
 	char priv[0] __aligned(NETDEV_ALIGN);
 };