cfg80211 API for channels/bitrates, mac80211 and driver conversion

This patch creates new cfg80211 wiphy API for channel and bitrate
registration and converts mac80211 and drivers to the new API. The
old mac80211 API is completely ripped out. All drivers (except ath5k)
are updated to the new API, in many cases I expect that optimisations
can be done.

Along with the regulatory code I've also ripped out the
IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag, I believe it to be
unnecessary if the hardware simply gives us whatever channels it wants
to support and we then enable/disable them as required, which is pretty
much required for travelling.

Additionally, the patch adds proper "basic" rate handling for STA
mode interface, AP mode interface will have to have new API added
to allow userspace to set the basic rate set, currently it'll be
empty... However, the basic rate handling will need to be moved to
the BSS conf stuff.

I do expect there to be bugs in this, especially wrt. transmit
power handling where I'm basically clueless about how it should work.

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

1 files changed, 47 insertions, 35 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3aae8e9e4e0..c9ff98a9321 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -82,10 +82,10 @@ static inline int should_drop_frame(struct ieee80211_rx_status *status,
  */
 static struct sk_buff *
 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
-		     struct ieee80211_rx_status *status)
+		     struct ieee80211_rx_status *status,
+		     struct ieee80211_rate *rate)
 {
 	struct ieee80211_sub_if_data *sdata;
-	struct ieee80211_rate *rate;
 	int needed_headroom = 0;
 	struct ieee80211_radiotap_header *rthdr;
 	__le64 *rttsft = NULL;
@@ -194,14 +194,11 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 			rtfixed->rx_flags |=
 				cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
 
-		rate = ieee80211_get_rate(local, status->phymode,
-					  status->rate);
-		if (rate)
-			rtfixed->rate = rate->rate / 5;
+		rtfixed->rate = rate->bitrate / 5;
 
 		rtfixed->chan_freq = cpu_to_le16(status->freq);
 
-		if (status->phymode == MODE_IEEE80211A)
+		if (status->band == IEEE80211_BAND_5GHZ)
 			rtfixed->chan_flags =
 				cpu_to_le16(IEEE80211_CHAN_OFDM |
 					    IEEE80211_CHAN_5GHZ);
@@ -320,34 +317,21 @@ static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx)
 
 
 static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
-			      struct sk_buff *skb,
-			      struct ieee80211_rx_status *status)
+				   struct sk_buff *skb,
+				   struct ieee80211_rx_status *status,
+				   struct ieee80211_rate *rate)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 	u32 load = 0, hdrtime;
-	struct ieee80211_rate *rate;
-	struct ieee80211_hw_mode *mode = local->hw.conf.mode;
-	int i;
 
 	/* Estimate total channel use caused by this frame */
 
-	if (unlikely(mode->num_rates < 0))
-		return TXRX_CONTINUE;
-
-	rate = &mode->rates[0];
-	for (i = 0; i < mode->num_rates; i++) {
-		if (mode->rates[i].val == status->rate) {
-			rate = &mode->rates[i];
-			break;
-		}
-	}
-
 	/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
 	 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
 
-	if (mode->mode == MODE_IEEE80211A ||
-	    (mode->mode == MODE_IEEE80211G &&
-	     rate->flags & IEEE80211_RATE_ERP))
+	if (status->band == IEEE80211_BAND_5GHZ ||
+	    (status->band == IEEE80211_BAND_5GHZ &&
+	     rate->flags & IEEE80211_RATE_ERP_G))
 		hdrtime = CHAN_UTIL_HDR_SHORT;
 	else
 		hdrtime = CHAN_UTIL_HDR_LONG;
@@ -356,7 +340,8 @@ static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
 	if (!is_multicast_ether_addr(hdr->addr1))
 		load += hdrtime;
 
-	load += skb->len * rate->rate_inv;
+	/* TODO: optimise again */
+	load += skb->len * CHAN_UTIL_RATE_LCM / rate->bitrate;
 
 	/* Divide channel_use by 8 to avoid wrapping around the counter */
 	load >>= CHAN_UTIL_SHIFT;
@@ -1685,7 +1670,8 @@ static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 					 struct sk_buff *skb,
 					 struct ieee80211_rx_status *status,
-					 u32 load)
+					 u32 load,
+					 struct ieee80211_rate *rate)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	struct ieee80211_sub_if_data *sdata;
@@ -1705,6 +1691,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 
 	rx.u.rx.status = status;
 	rx.u.rx.load = load;
+	rx.u.rx.rate = rate;
 	rx.fc = le16_to_cpu(hdr->frame_control);
 	type = rx.fc & IEEE80211_FCTL_FTYPE;
 
@@ -1837,6 +1824,8 @@ u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 	u16 head_seq_num, buf_size;
 	int index;
 	u32 pkt_load;
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_rate *rate;
 
 	buf_size = tid_agg_rx->buf_size;
 	head_seq_num = tid_agg_rx->head_seq_num;
@@ -1867,12 +1856,14 @@ u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 				memcpy(&status,
 					tid_agg_rx->reorder_buf[index]->cb,
 					sizeof(status));
+				sband = local->hw.wiphy->bands[status.band];
+				rate = &sband->bitrates[status.rate_idx];
 				pkt_load = ieee80211_rx_load_stats(local,
 						tid_agg_rx->reorder_buf[index],
-						&status);
+						&status, rate);
 				__ieee80211_rx_handle_packet(hw,
 					tid_agg_rx->reorder_buf[index],
-					&status, pkt_load);
+					&status, pkt_load, rate);
 				tid_agg_rx->stored_mpdu_num--;
 				tid_agg_rx->reorder_buf[index] = NULL;
 			}
@@ -1912,11 +1903,13 @@ u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
 		/* release the reordered frame back to stack */
 		memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
 			sizeof(status));
+		sband = local->hw.wiphy->bands[status.band];
+		rate = &sband->bitrates[status.rate_idx];
 		pkt_load = ieee80211_rx_load_stats(local,
 					tid_agg_rx->reorder_buf[index],
-					&status);
+					&status, rate);
 		__ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
-						&status, pkt_load);
+					     &status, pkt_load, rate);
 		tid_agg_rx->stored_mpdu_num--;
 		tid_agg_rx->reorder_buf[index] = NULL;
 		tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
@@ -1997,6 +1990,25 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	u32 pkt_load;
+	struct ieee80211_rate *rate = NULL;
+	struct ieee80211_supported_band *sband;
+
+	if (status->band < 0 ||
+	    status->band > IEEE80211_NUM_BANDS) {
+		WARN_ON(1);
+		return;
+	}
+
+	sband = local->hw.wiphy->bands[status->band];
+
+	if (!sband ||
+	    status->rate_idx < 0 ||
+	    status->rate_idx >= sband->n_bitrates) {
+		WARN_ON(1);
+		return;
+	}
+
+	rate = &sband->bitrates[status->rate_idx];
 
 	/*
 	 * key references and virtual interfaces are protected using RCU
@@ -2011,17 +2023,17 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	 * if it was previously present.
 	 * Also, frames with less than 16 bytes are dropped.
 	 */
-	skb = ieee80211_rx_monitor(local, skb, status);
+	skb = ieee80211_rx_monitor(local, skb, status, rate);
 	if (!skb) {
 		rcu_read_unlock();
 		return;
 	}
 
-	pkt_load = ieee80211_rx_load_stats(local, skb, status);
+	pkt_load = ieee80211_rx_load_stats(local, skb, status, rate);
 	local->channel_use_raw += pkt_load;
 
 	if (!ieee80211_rx_reorder_ampdu(local, skb))
-		__ieee80211_rx_handle_packet(hw, skb, status, pkt_load);
+		__ieee80211_rx_handle_packet(hw, skb, status, pkt_load, rate);
 
 	rcu_read_unlock();
 }