cfg80211: allow using CQM event to notify packet loss

This adds the ability for drivers to use CQM events
to notify about packet loss for specific stations
(which could be the AP for the managed mode case).
Since the threshold might be determined by the
driver (it isn't passed in right now) it will be
passed out of the driver to userspace in the event.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 037b4e498890fc52579f3525c45a57abafd543d7..d706bf3badc850c0889e107b49fc25c7b701e43d 100644 (file)
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -1819,6 +1819,8 @@ enum nl80211_ps_state {
  *     the minimum amount the RSSI level must change after an event before a
  *     new event may be issued (to reduce effects of RSSI oscillation).
  * @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_AFTER_LAST: internal
  * @NL80211_ATTR_CQM_MAX: highest key attribute
  */
@@ -1827,6 +1829,7 @@ enum nl80211_attr_cqm {
        NL80211_ATTR_CQM_RSSI_THOLD,
        NL80211_ATTR_CQM_RSSI_HYST,
        NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT,
+       NL80211_ATTR_CQM_PKT_LOSS_EVENT,
 
        /* keep last */
        __NL80211_ATTR_CQM_AFTER_LAST,

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index dd4c43f512e2a4943b151c6a3c8d5d7514e2a1d9..0663945cfa48190f173da24812326261ff6c8d61 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2601,6 +2601,18 @@ void cfg80211_cqm_rssi_notify(struct net_device *dev,
                              enum nl80211_cqm_rssi_threshold_event rssi_event,
                              gfp_t gfp);
 
+/**
+ * cfg80211_cqm_pktloss_notify - notify userspace about packetloss to peer
+ * @dev: network device
+ * @peer: peer's MAC address
+ * @num_packets: how many packets were lost -- should be a fixed threshold
+ *     but probably no less than maybe 50, or maybe a throughput dependent
+ *     threshold (to account for temporary interference)
+ * @gfp: context flags
+ */
+void cfg80211_cqm_pktloss_notify(struct net_device *dev,
+                                const u8 *peer, u32 num_packets, gfp_t gfp);
+
 /* Logging, debugging and troubleshooting/diagnostic helpers. */
 
 /* wiphy_printk helpers, similar to dev_printk */

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 26838d903b9a962b2efb5f274cad5ef01c24c4fc..6980a0c315b237e66916305530e82a4154b6da6a 100644 (file)
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -1028,3 +1028,15 @@ void cfg80211_cqm_rssi_notify(struct net_device *dev,
        nl80211_send_cqm_rssi_notify(rdev, dev, rssi_event, gfp);
 }
 EXPORT_SYMBOL(cfg80211_cqm_rssi_notify);
+
+void cfg80211_cqm_pktloss_notify(struct net_device *dev,
+                                const u8 *peer, u32 num_packets, gfp_t gfp)
+{
+       struct wireless_dev *wdev = dev->ieee80211_ptr;
+       struct wiphy *wiphy = wdev->wiphy;
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+       /* Indicate roaming trigger event to user space */
+       nl80211_send_cqm_pktloss_notify(rdev, dev, peer, num_packets, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cqm_pktloss_notify);

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8734efa663d1c5f751fb9a23883bbe1c54f3cfbb..67ff7e92cb99df7bd6a987417b00956d58c8cdeb 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5715,6 +5715,51 @@ nl80211_send_cqm_rssi_notify(struct cfg80211_registered_device *rdev,
        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)
+{
+       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;
+       }
+
+       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);
+
+       pinfoattr = nla_nest_start(msg, NL80211_ATTR_CQM);
+       if (!pinfoattr)
+               goto nla_put_failure;
+
+       NLA_PUT_U32(msg, NL80211_ATTR_CQM_PKT_LOSS_EVENT, num_packets);
+
+       nla_nest_end(msg, pinfoattr);
+
+       if (genlmsg_end(msg, hdr) < 0) {
+               nlmsg_free(msg);
+               return;
+       }
+
+       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);
+}
+
 static int nl80211_netlink_notify(struct notifier_block * nb,
                                  unsigned long state,
                                  void *_notify)

diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 30d2f939150d78e3da6529e5e34f9685c96c4283..16c2f719076824e2413364d35e7396ba087400b7 100644 (file)
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -87,5 +87,9 @@ nl80211_send_cqm_rssi_notify(struct cfg80211_registered_device *rdev,
                             struct net_device *netdev,
                             enum nl80211_cqm_rssi_threshold_event rssi_event,
                             gfp_t gfp);
+void
+nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
+                               struct net_device *netdev, const u8 *peer,
+                               u32 num_packets, gfp_t gfp);
 
 #endif /* __NET_WIRELESS_NL80211_H */