cfg80211: support TX error rate CQM

Let the user configure serveral TX error conection quality monitoring
parameters: % error rate, survey interval, and # of attempted packets.

On exceeding the TX failure rate over the given interval, the driver
will send a CQM notify event with the actual TX failure rate and
packets attempted.

Signed-off-by: Thomas Pedersen <c_tpeder@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

5 files changed, 140 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index e791487ead37..d6cfacc3ce4d 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -1550,6 +1550,8 @@ enum nl80211_attrs {
 /* default RSSI threshold for scan results if none specified. */
 #define NL80211_SCAN_RSSI_THOLD_OFF             -300
 
+#define NL80211_CQM_TXE_MAX_INTVL               1800
+
 /**
  * enum nl80211_iftype - (virtual) interface types
  *
@@ -2589,6 +2591,17 @@ enum nl80211_ps_state {
  * @NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT: RSSI threshold event
  * @NL80211_ATTR_CQM_PKT_LOSS_EVENT: a u32 value indicating that this many
  *      consecutive packets were not acknowledged by the peer
+ * @NL80211_ATTR_CQM_TXE_RATE: TX error rate in %. Minimum % of TX failures
+ *      during the given %NL80211_ATTR_CQM_TXE_INTVL before an
+ *      %NL80211_CMD_NOTIFY_CQM with reported %NL80211_ATTR_CQM_TXE_RATE and
+ *      %NL80211_ATTR_CQM_TXE_PKTS is generated.
+ * @NL80211_ATTR_CQM_TXE_PKTS: number of attempted packets in a given
+ *      %NL80211_ATTR_CQM_TXE_INTVL before %NL80211_ATTR_CQM_TXE_RATE is
+ *      checked.
+ * @NL80211_ATTR_CQM_TXE_INTVL: interval in seconds. Specifies the periodic
+ *      interval in which %NL80211_ATTR_CQM_TXE_PKTS and
+ *      %NL80211_ATTR_CQM_TXE_RATE must be satisfied before generating an
+ *      %NL80211_CMD_NOTIFY_CQM. Set to 0 to turn off TX error reporting.
  * @__NL80211_ATTR_CQM_AFTER_LAST: internal
  * @NL80211_ATTR_CQM_MAX: highest key attribute
  */
@@ -2598,6 +2611,9 @@ enum nl80211_attr_cqm {
         NL80211_ATTR_CQM_RSSI_HYST,
         NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT,
         NL80211_ATTR_CQM_PKT_LOSS_EVENT,
+        NL80211_ATTR_CQM_TXE_RATE,
+        NL80211_ATTR_CQM_TXE_PKTS,
+        NL80211_ATTR_CQM_TXE_INTVL,
 
         /* keep last */
         __NL80211_ATTR_CQM_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 0245208c2978..493fa0c79005 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1573,6 +1573,8 @@ struct cfg80211_gtk_rekey_data {
  * @set_power_mgmt: Configure WLAN power management. A timeout value of -1
  *      allows the driver to adjust the dynamic ps timeout value.
  * @set_cqm_rssi_config: Configure connection quality monitor RSSI threshold.
+ * @set_cqm_txe_config: Configure connection quality monitor TX error
+ *      thresholds.
  * @sched_scan_start: Tell the driver to start a scheduled scan.
  * @sched_scan_stop: Tell the driver to stop an ongoing scheduled
  *      scan.  The driver_initiated flag specifies whether the driver
@@ -1783,6 +1785,10 @@ struct cfg80211_ops {
                                        struct net_device *dev,
                                        s32 rssi_thold, u32 rssi_hyst);
 
+        int     (*set_cqm_txe_config)(struct wiphy *wiphy,
+                                      struct net_device *dev,
+                                      u32 rate, u32 pkts, u32 intvl);
+
         void    (*mgmt_frame_register)(struct wiphy *wiphy,
                                        struct wireless_dev *wdev,
                                        u16 frame_type, bool reg);
@@ -3396,6 +3402,21 @@ void cfg80211_cqm_pktloss_notify(struct net_device *dev,
                                  const u8 *peer, u32 num_packets, gfp_t gfp);
 
 /**
+ * cfg80211_cqm_txe_notify - TX error rate event
+ * @dev: network device
+ * @peer: peer's MAC address
+ * @num_packets: how many packets were lost
+ * @rate: % of packets which failed transmission
+ * @intvl: interval (in s) over which the TX failure threshold was breached.
+ * @gfp: context flags
+ *
+ * Notify userspace when configured % TX failures over number of packets in a
+ * given interval is exceeded.
+ */
+void cfg80211_cqm_txe_notify(struct net_device *dev, const u8 *peer,
+                             u32 num_packets, u32 rate, u32 intvl, gfp_t gfp);
+
+/**
  * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
  * @dev: network device
  * @bssid: BSSID of AP (to avoid races)
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index abe9f82d5a82..1cdb1d5e6b0f 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -919,6 +919,19 @@ void cfg80211_cqm_pktloss_notify(struct net_device *dev,
 }
 EXPORT_SYMBOL(cfg80211_cqm_pktloss_notify);
 
+void cfg80211_cqm_txe_notify(struct net_device *dev,
+                             const u8 *peer, u32 num_packets,
+                             u32 rate, u32 intvl, gfp_t gfp)
+{
+        struct wireless_dev *wdev = dev->ieee80211_ptr;
+        struct wiphy *wiphy = wdev->wiphy;
+        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+        nl80211_send_cqm_txe_notify(rdev, dev, peer, num_packets,
+                                    rate, intvl, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cqm_txe_notify);
+
 void cfg80211_gtk_rekey_notify(struct net_device *dev, const u8 *bssid,
                                const u8 *replay_ctr, gfp_t gfp)
 {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index be8750f91d78..9216e45e53a0 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6267,8 +6267,35 @@ nl80211_attr_cqm_policy[NL80211_ATTR_CQM_MAX + 1] __read_mostly = {
         [NL80211_ATTR_CQM_RSSI_THOLD] = { .type = NLA_U32 },
         [NL80211_ATTR_CQM_RSSI_HYST] = { .type = NLA_U32 },
         [NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] = { .type = NLA_U32 },
+        [NL80211_ATTR_CQM_TXE_RATE] = { .type = NLA_U32 },
+        [NL80211_ATTR_CQM_TXE_PKTS] = { .type = NLA_U32 },
+        [NL80211_ATTR_CQM_TXE_INTVL] = { .type = NLA_U32 },
 };
 
+static int nl80211_set_cqm_txe(struct genl_info *info,
+                                u32 rate, u32 pkts, u32 intvl)
+{
+        struct cfg80211_registered_device *rdev = info->user_ptr[0];
+        struct wireless_dev *wdev;
+        struct net_device *dev = info->user_ptr[1];
+
+        if ((rate < 0 || rate > 100) ||
+            (intvl < 0 || intvl > NL80211_CQM_TXE_MAX_INTVL))
+                return -EINVAL;
+
+        wdev = dev->ieee80211_ptr;
+
+        if (!rdev->ops->set_cqm_txe_config)
+                return -EOPNOTSUPP;
+
+        if (wdev->iftype != NL80211_IFTYPE_STATION &&
+            wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)
+                return -EOPNOTSUPP;
+
+        return rdev->ops->set_cqm_txe_config(wdev->wiphy, dev,
+                                             rate, pkts, intvl);
+}
+
 static int nl80211_set_cqm_rssi(struct genl_info *info,
                                 s32 threshold, u32 hysteresis)
 {
@@ -6316,6 +6343,14 @@ static int nl80211_set_cqm(struct sk_buff *skb, struct genl_info *info)
                 threshold = nla_get_u32(attrs[NL80211_ATTR_CQM_RSSI_THOLD]);
                 hysteresis = nla_get_u32(attrs[NL80211_ATTR_CQM_RSSI_HYST]);
                 err = nl80211_set_cqm_rssi(info, threshold, hysteresis);
+        } else if (attrs[NL80211_ATTR_CQM_TXE_RATE] &&
+                   attrs[NL80211_ATTR_CQM_TXE_PKTS] &&
+                   attrs[NL80211_ATTR_CQM_TXE_INTVL]) {
+                u32 rate, pkts, intvl;
+                rate = nla_get_u32(attrs[NL80211_ATTR_CQM_TXE_RATE]);
+                pkts = nla_get_u32(attrs[NL80211_ATTR_CQM_TXE_PKTS]);
+                intvl = nla_get_u32(attrs[NL80211_ATTR_CQM_TXE_INTVL]);
+                err = nl80211_set_cqm_txe(info, rate, pkts, intvl);
         } else
                 err = -EINVAL;
 
@@ -8496,6 +8531,56 @@ void nl80211_ch_switch_notify(struct cfg80211_registered_device *rdev,
 }
 
 void
+nl80211_send_cqm_txe_notify(struct cfg80211_registered_device *rdev,
+                            struct net_device *netdev, const u8 *peer,
+                            u32 num_packets, u32 rate, u32 intvl, gfp_t gfp)
+{
+        struct sk_buff *msg;
+        struct nlattr *pinfoattr;
+        void *hdr;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+        if (!msg)
+                return;
+
+        hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_NOTIFY_CQM);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+            nla_put_u32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex) ||
+            nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, peer))
+                goto nla_put_failure;
+
+        pinfoattr = nla_nest_start(msg, NL80211_ATTR_CQM);
+        if (!pinfoattr)
+                goto nla_put_failure;
+
+        if (nla_put_u32(msg, NL80211_ATTR_CQM_TXE_PKTS, num_packets))
+                goto nla_put_failure;
+
+        if (nla_put_u32(msg, NL80211_ATTR_CQM_TXE_RATE, rate))
+                goto nla_put_failure;
+
+        if (nla_put_u32(msg, NL80211_ATTR_CQM_TXE_INTVL, intvl))
+                goto nla_put_failure;
+
+        nla_nest_end(msg, pinfoattr);
+
+        genlmsg_end(msg, hdr);
+
+        genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+                                nl80211_mlme_mcgrp.id, gfp);
+        return;
+
+ nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+        nlmsg_free(msg);
+}
+
+void
 nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
                                 struct net_device *netdev, const u8 *peer,
                                 u32 num_packets, gfp_t gfp)
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 89ce99675e61..9f2616fffb40 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -110,6 +110,11 @@ nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
                                 struct net_device *netdev, const u8 *peer,
                                 u32 num_packets, gfp_t gfp);
 
+void
+nl80211_send_cqm_txe_notify(struct cfg80211_registered_device *rdev,
+                            struct net_device *netdev, const u8 *peer,
+                            u32 num_packets, u32 rate, u32 intvl, gfp_t gfp);
+
 void nl80211_gtk_rekey_notify(struct cfg80211_registered_device *rdev,
                               struct net_device *netdev, const u8 *bssid,
                               const u8 *replay_ctr, gfp_t gfp);