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Commit ec61cd63 authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: support HT notify channel width action 



Support the HT notify channel width action frame
to update the rate scaling about the bandwidth
the peer can receive in.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 598a5938

include/linux/ieee80211.h

+9 −0
Original line number Diff line number Diff line
@@ -701,6 +701,11 @@ enum ieee80211_rann_flags { 
	RANN_FLAG_IS_GATE = 1 << 0,

};



enum ieee80211_ht_chanwidth_values {

	IEEE80211_HT_CHANWIDTH_20MHZ = 0,

	IEEE80211_HT_CHANWIDTH_ANY = 1,

};



#define WLAN_SA_QUERY_TR_ID_LEN 2



struct ieee80211_mgmt {
@@ -821,6 +826,10 @@ struct ieee80211_mgmt { 
					u8 action;

					u8 smps_control;

				} __packed ht_smps;

				struct {

					u8 action_code;

					u8 chanwidth;

				} __packed ht_notify_cw;

				struct {

					u8 action_code;

					u8 dialog_token;

net/mac80211/rx.c

+30 −1
Original line number Diff line number Diff line
@@ -2353,7 +2353,7 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)

			break;



		/* verify action & smps_control are present */

		/* verify action & smps_control/chanwidth are present */

		if (len < IEEE80211_MIN_ACTION_SIZE + 2)

			goto invalid;
@@ -2392,6 +2392,35 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 
						 IEEE80211_RC_SMPS_CHANGED);

			goto handled;

		}

		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {

			struct ieee80211_supported_band *sband;

			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;

			bool old_40mhz, new_40mhz;



			/* If it doesn't support 40 MHz it can't change ... */

			if (!rx->sta->supports_40mhz)

				goto handled;



			old_40mhz = rx->sta->sta.ht_cap.cap &

					IEEE80211_HT_CAP_SUP_WIDTH_20_40;

			new_40mhz = chanwidth == IEEE80211_HT_CHANWIDTH_ANY;



			if (old_40mhz == new_40mhz)

				goto handled;



			if (new_40mhz)

				rx->sta->sta.ht_cap.cap |=

					IEEE80211_HT_CAP_SUP_WIDTH_20_40;

			else

				rx->sta->sta.ht_cap.cap &=

					~IEEE80211_HT_CAP_SUP_WIDTH_20_40;



			sband = rx->local->hw.wiphy->bands[status->band];



			rate_control_rate_update(local, sband, rx->sta,

						 IEEE80211_RC_BW_CHANGED);

			goto handled;

		}

		default:

			goto invalid;

		}