Commit a7a6bdd0 authored by Arik Nemtsov's avatar Arik Nemtsov Committed by Johannes Berg
Browse files

mac80211: introduce TDLS channel switch ops 



Implement the cfg80211 TDLS channel switch ops and introduce new mac80211
ones for low-level drivers.
Verify low-level driver support for the new ops when using the relevant
wiphy feature bit. Also verify the peer supports channel switching before
passing the command down.

Add a new STA flag to track the off-channel state with the TDLS peer and
make sure to cancel the channel-switch if the peer STA is unexpectedly
removed.

Signed-off-by: default avatarArik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: default avatarArik Nemtsov <arik@wizery.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 53837584

include/net/mac80211.h

+19 −0
Original line number Diff line number Diff line
@@ -2915,6 +2915,16 @@ enum ieee80211_reconfig_type { 
 *

 * @get_txpower: get current maximum tx power (in dBm) based on configuration

 *	and hardware limits.

 *

 * @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver

 *	is responsible for continually initiating channel-switching operations

 *	and returning to the base channel for communication with the AP. The

 *	driver receives a channel-switch request template and the location of

 *	the switch-timing IE within the template as part of the invocation.

 *	The template is valid only within the call, and the driver can

 *	optionally copy the skb for further re-use.

 * @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both

 *	peers must be on the base channel when the call completes.

 */

struct ieee80211_ops {

	void (*tx)(struct ieee80211_hw *hw,
@@ -3126,6 +3136,15 @@ struct ieee80211_ops { 
	u32 (*get_expected_throughput)(struct ieee80211_sta *sta);

	int (*get_txpower)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,

			   int *dbm);



	int (*tdls_channel_switch)(struct ieee80211_hw *hw,

				   struct ieee80211_vif *vif,

				   struct ieee80211_sta *sta, u8 oper_class,

				   struct cfg80211_chan_def *chandef,

				   struct sk_buff *skb, u32 ch_sw_tm_ie);

	void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,

					   struct ieee80211_vif *vif,

					   struct ieee80211_sta *sta);

};



/**

net/mac80211/cfg.c

+2 −0
Original line number Diff line number Diff line
@@ -3752,6 +3752,8 @@ const struct cfg80211_ops mac80211_config_ops = { 
	.set_rekey_data = ieee80211_set_rekey_data,

	.tdls_oper = ieee80211_tdls_oper,

	.tdls_mgmt = ieee80211_tdls_mgmt,

	.tdls_channel_switch = ieee80211_tdls_channel_switch,

	.tdls_cancel_channel_switch = ieee80211_tdls_cancel_channel_switch,

	.probe_client = ieee80211_probe_client,

	.set_noack_map = ieee80211_set_noack_map,

#ifdef CONFIG_PM

net/mac80211/debugfs_sta.c

+5 −5
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf, 
	test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""



	int res = scnprintf(buf, sizeof(buf),

			    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",

			    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",

			    TEST(AUTH), TEST(ASSOC), TEST(PS_STA),

			    TEST(PS_DRIVER), TEST(AUTHORIZED),

			    TEST(SHORT_PREAMBLE),
@@ -83,10 +83,10 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf, 
			    TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),

			    TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),

			    TEST(TDLS_PEER_AUTH), TEST(TDLS_INITIATOR),

			    TEST(TDLS_CHAN_SWITCH), TEST(4ADDR_EVENT),

			    TEST(INSERTED), TEST(RATE_CONTROL),

			    TEST(TOFFSET_KNOWN), TEST(MPSP_OWNER),

			    TEST(MPSP_RECIPIENT));

			    TEST(TDLS_CHAN_SWITCH), TEST(TDLS_OFF_CHANNEL),

			    TEST(4ADDR_EVENT), TEST(INSERTED),

			    TEST(RATE_CONTROL), TEST(TOFFSET_KNOWN),

			    TEST(MPSP_OWNER), TEST(MPSP_RECIPIENT));

#undef TEST

	return simple_read_from_buffer(userbuf, count, ppos, buf, res);

}

net/mac80211/driver-ops.h

+41 −0
Original line number Diff line number Diff line
@@ -1296,4 +1296,45 @@ static inline int drv_get_txpower(struct ieee80211_local *local, 
	return ret;

}



static inline int

drv_tdls_channel_switch(struct ieee80211_local *local,

			struct ieee80211_sub_if_data *sdata,

			struct ieee80211_sta *sta, u8 oper_class,

			struct cfg80211_chan_def *chandef,

			struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)

{

	int ret;



	might_sleep();

	if (!check_sdata_in_driver(sdata))

		return -EIO;



	if (!local->ops->tdls_channel_switch)

		return -EOPNOTSUPP;



	trace_drv_tdls_channel_switch(local, sdata, sta, oper_class, chandef);

	ret = local->ops->tdls_channel_switch(&local->hw, &sdata->vif, sta,

					      oper_class, chandef, tmpl_skb,

					      ch_sw_tm_ie);

	trace_drv_return_int(local, ret);

	return ret;

}



static inline void

drv_tdls_cancel_channel_switch(struct ieee80211_local *local,

			       struct ieee80211_sub_if_data *sdata,

			       struct ieee80211_sta *sta)

{

	might_sleep();

	if (!check_sdata_in_driver(sdata))

		return;



	if (!local->ops->tdls_cancel_channel_switch)

		return;



	trace_drv_tdls_cancel_channel_switch(local, sdata, sta);

	local->ops->tdls_cancel_channel_switch(&local->hw, &sdata->vif, sta);

	trace_drv_return_void(local);

}



#endif /* __MAC80211_DRIVER_OPS */

net/mac80211/ieee80211_i.h

+6 −0
Original line number Diff line number Diff line
@@ -2007,6 +2007,12 @@ int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,

			const u8 *peer, enum nl80211_tdls_operation oper);

void ieee80211_tdls_peer_del_work(struct work_struct *wk);

int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,

				  const u8 *addr, u8 oper_class,

				  struct cfg80211_chan_def *chandef);

void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,

					  struct net_device *dev,

					  const u8 *addr);



extern const struct ethtool_ops ieee80211_ethtool_ops;

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