Commit c063dbf5 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

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: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 79b1c460

include/linux/nl80211.h

+3 −0
Original line number Diff line number Diff line
@@ -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,

include/net/cfg80211.h

+12 −0
Original line number Diff line number Diff line
@@ -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 */

net/wireless/mlme.c

+12 −0
Original line number Diff line number Diff line
@@ -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);

net/wireless/nl80211.c

+45 −0
Original line number Diff line number Diff line
@@ -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)

net/wireless/nl80211.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

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