add the new compat-wireless for 2.6.27 + multi-rate retry and minstrel patches, rename patches/ for old compat-wireless to patches-old/

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12865 3c298f89-4303-0410-b956-a3cf2f4a3e73

11 files changed, 1818 insertions, 5 deletions

diff --git a/package/mac80211/Makefile b/package/mac80211/Makefile
index a3b483cb52..cd1feed8c2 100644
--- a/package/mac80211/Makefile
+++ b/package/mac80211/Makefile
@@ -12,9 +12,16 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=mac80211
 PKG_RELEASE:=1
 
-PKG_VERSION:=2008-08-06
+ifneq ($(CONFIG_LINUX_2_6_27),)
+  PKG_VERSION:=2008-09-28
+  PKG_SOURCE_URL:=http://www.orbit-lab.org/kernel/compat-wireless-2.6/2008/09
+else
+  PKG_VERSION:=2008-08-06
+  PKG_SOURCE_URL:=http://www.orbit-lab.org/kernel/compat-wireless-2.6/2008/08
+  PATCH_DIR:=./patches-old
+endif
+
 PKG_SOURCE:=compat-wireless-$(PKG_VERSION).tar.bz2
-PKG_SOURCE_URL:=http://www.orbit-lab.org/kernel/compat-wireless-2.6/2008/08/
 PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/compat-wireless-$(PKG_VERSION)
 
 include $(INCLUDE_DIR)/package.mk
@@ -137,9 +144,11 @@ define KernelPackage/ath5k
 endef
 
 BUILDFLAGS:= \
+	-I$(PKG_BUILD_DIR)/include \
 	$(foreach opt,$(CONFOPTS),-DCONFIG_$(opt)) \
 	$(if $(CONFIG_LEDS_TRIGGERS), -DCONFIG_MAC80211_LEDS -DCONFIG_LEDS_TRIGGERS) \
-	-D__CONFIG_MAC80211_RC_DEFAULT=pid \
+	$(if $(CONFIG_DEBUG_FS), -DCONFIG_MAC80211_DEBUGFS) \
+	-D__CONFIG_MAC80211_RC_DEFAULT=minstrel \
 
 MAKE_OPTS:= \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
@@ -148,9 +157,11 @@ MAKE_OPTS:= \
 	$(foreach opt,$(CONFOPTS),CONFIG_$(opt)=m) \
 	CONFIG_NL80211=y \
 	CONFIG_MAC80211_RC_PID=y \
+	CONFIG_MAC80211_RC_MINSTREL=y \
 	CONFIG_MAC80211_LEDS=$(CONFIG_LEDS_TRIGGERS) \
-	LINUXINCLUDE="-I$(PKG_BUILD_DIR)/include -I$(LINUX_DIR)/include -include linux/autoconf.h" \
+	CONFIG_MAC80211_DEBUGFS=$(CONFIG_DEBUG_FS) \
 	KLIB_BUILD="$(LINUX_DIR)" \
+	MODPROBE=:
 
 define Build/Prepare
 	rm -rf $(PKG_BUILD_DIR)
@@ -160,7 +171,7 @@ define Build/Prepare
 	$(if $(QUILT),touch $(PKG_BUILD_DIR)/.quilt_used)
 	unzip -jod $(PKG_BUILD_DIR) $(DL_DIR)/$(RT61FW)
 	unzip -jod $(PKG_BUILD_DIR) $(DL_DIR)/$(RT71FW)
-	rm -rf $(PKG_BUILD_DIR)/include/linux/ssb
+	$(if $(CONFIG_TARGET_brcm47xx),rm -rf $(PKG_BUILD_DIR)/include/linux/ssb)
 endef
 
 ifneq ($(CONFIG_PACKAGE_kmod-mac80211),)
diff --git a/package/mac80211/patches/001-disable_drivers.patch b/package/mac80211/patches-old/001-disable_drivers.patch
index ccf0409156..ccf0409156 100644
--- a/package/mac80211/patches/001-disable_drivers.patch
+++ b/package/mac80211/patches-old/001-disable_drivers.patch
diff --git a/package/mac80211/patches/004-allow-ap-vlan-modes.patch b/package/mac80211/patches-old/004-allow-ap-vlan-modes.patch
index a8080b20ea..a8080b20ea 100644
--- a/package/mac80211/patches/004-allow-ap-vlan-modes.patch
+++ b/package/mac80211/patches-old/004-allow-ap-vlan-modes.patch
diff --git a/package/mac80211/patches/000-kconfig.patch b/package/mac80211/patches/000-kconfig.patch
new file mode 100644
index 0000000000..bcbf8868b5
--- /dev/null
+++ b/package/mac80211/patches/000-kconfig.patch
@@ -0,0 +1,201 @@
+--- /dev/null
++++ b/net/mac80211/Kconfig
+@@ -0,0 +1,198 @@
++config MAC80211
++	tristate "Generic IEEE 802.11 Networking Stack (mac80211)"
++	select CRYPTO
++	select CRYPTO_ECB
++	select CRYPTO_ARC4
++	select CRYPTO_AES
++	select CRC32
++	select WIRELESS_EXT
++	select CFG80211
++	---help---
++	  This option enables the hardware independent IEEE 802.11
++	  networking stack.
++
++menu "Rate control algorithm selection"
++	depends on MAC80211 != n
++
++config MAC80211_RC_PID
++	bool "PID controller based rate control algorithm" if EMBEDDED
++	default y
++	---help---
++	  This option enables a TX rate control algorithm for
++	  mac80211 that uses a PID controller to select the TX
++	  rate.
++
++choice
++	prompt "Default rate control algorithm"
++	default MAC80211_RC_DEFAULT_PID
++	---help---
++	  This option selects the default rate control algorithm
++	  mac80211 will use. Note that this default can still be
++	  overriden through the ieee80211_default_rc_algo module
++	  parameter if different algorithms are available.
++
++config MAC80211_RC_DEFAULT_PID
++	bool "PID controller based rate control algorithm"
++	depends on MAC80211_RC_PID
++	---help---
++	  Select the PID controller based rate control as the
++	  default rate control algorithm. You should choose
++	  this unless you know what you are doing.
++
++endchoice
++
++config MAC80211_RC_DEFAULT
++	string
++	default "pid" if MAC80211_RC_DEFAULT_PID
++	default ""
++
++endmenu
++
++config MAC80211_MESH
++	bool "Enable mac80211 mesh networking (pre-802.11s) support"
++	depends on MAC80211 && EXPERIMENTAL
++	---help---
++	 This options enables support of Draft 802.11s mesh networking.
++	 The implementation is based on Draft 1.08 of the Mesh Networking
++	 amendment. For more information visit http://o11s.org/.
++
++
++config MAC80211_LEDS
++	bool "Enable LED triggers"
++	depends on MAC80211
++	select NEW_LEDS
++	select LEDS_TRIGGERS
++	---help---
++	  This option enables a few LED triggers for different
++	  packet receive/transmit events.
++
++config MAC80211_DEBUGFS
++	bool "Export mac80211 internals in DebugFS"
++	depends on MAC80211 && DEBUG_FS
++	---help---
++	  Select this to see extensive information about
++	  the internal state of mac80211 in debugfs.
++
++	  Say N unless you know you need this.
++
++menuconfig MAC80211_DEBUG_MENU
++	bool "Select mac80211 debugging features"
++	depends on MAC80211
++	---help---
++	  This option collects various mac80211 debug settings.
++
++config MAC80211_DEBUG_PACKET_ALIGNMENT
++	bool "Enable packet alignment debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  This option is recommended for driver authors and strongly
++	  discouraged for everybody else, it will trigger a warning
++	  when a driver hands mac80211 a buffer that is aligned in
++	  a way that will cause problems with the IP stack on some
++	  architectures.
++
++	  Say N unless you're writing a mac80211 based driver.
++
++config MAC80211_NOINLINE
++	bool "Do not inline TX/RX handlers"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  This option affects code generation in mac80211, when
++	  selected some functions are marked "noinline" to allow
++	  easier debugging of problems in the transmit and receive
++	  paths.
++
++	  This option increases code size a bit and inserts a lot
++	  of function calls in the code, but is otherwise safe to
++	  enable.
++
++	  If unsure, say N unless you expect to be finding problems
++	  in mac80211.
++
++config MAC80211_VERBOSE_DEBUG
++	bool "Verbose debugging output"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  Selecting this option causes mac80211 to print out
++	  many debugging messages. It should not be selected
++	  on production systems as some of the messages are
++	  remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_HT_DEBUG
++	bool "Verbose HT debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  This option enables 802.11n High Throughput features
++	  debug tracing output.
++
++	  It should not be selected on production systems as some
++	  of the messages are remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_TKIP_DEBUG
++	bool "Verbose TKIP debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  Selecting this option causes mac80211 to print out
++	  very verbose TKIP debugging messages. It should not
++	  be selected on production systems as those messages
++	  are remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_IBSS_DEBUG
++	bool "Verbose IBSS debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  Selecting this option causes mac80211 to print out
++	  very verbose IBSS debugging messages. It should not
++	  be selected on production systems as those messages
++	  are remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_VERBOSE_PS_DEBUG
++	bool "Verbose powersave mode debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  Selecting this option causes mac80211 to print out very
++	  verbose power save mode debugging messages (when mac80211
++	  is an AP and has power saving stations.)
++	  It should not be selected on production systems as those
++	  messages are remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_VERBOSE_MPL_DEBUG
++	bool "Verbose mesh peer link debugging"
++	depends on MAC80211_DEBUG_MENU
++	depends on MAC80211_MESH
++	---help---
++	  Selecting this option causes mac80211 to print out very
++	  verbose mesh peer link debugging messages (when mac80211
++	  is taking part in a mesh network).
++	  It should not be selected on production systems as those
++	  messages are remotely triggerable.
++
++	  Do not select this option.
++
++config MAC80211_DEBUG_COUNTERS
++	bool "Extra statistics for TX/RX debugging"
++	depends on MAC80211_DEBUG_MENU
++	depends on MAC80211_DEBUGFS
++	---help---
++	  Selecting this option causes mac80211 to keep additional
++	  and very verbose statistics about TX and RX handler use
++	  and show them in debugfs.
++
++	  If unsure, say N.
++
++config MAC80211_VERBOSE_SPECT_MGMT_DEBUG
++	bool "Verbose Spectrum Management (IEEE 802.11h)debugging"
++	depends on MAC80211_DEBUG_MENU
++	---help---
++	  Say Y here to print out verbose Spectrum Management (IEEE 802.11h)
++	  debug messages.
diff --git a/package/mac80211/patches/100-define.patch b/package/mac80211/patches/100-define.patch
new file mode 100644
index 0000000000..b41cad6943
--- /dev/null
+++ b/package/mac80211/patches/100-define.patch
@@ -0,0 +1,14 @@
+--- a/include/net/compat.h
++++ b/include/net/compat.h
+@@ -6,6 +6,11 @@
+ #include <linux/compat_autoconf.h>
+ 
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28))
++#include <linux/if_ether.h>
++
++#ifndef ETH_P_PAE
++#define ETH_P_PAE 0x888E      /* Port Access Entity (IEEE 802.1X) */
++#endif
+ #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)) */
+ 
+ #endif /* LINUX_26_COMPAT_H */
diff --git a/package/mac80211/patches/110-ath5k_stat.patch b/package/mac80211/patches/110-ath5k_stat.patch
new file mode 100644
index 0000000000..2cd9548518
--- /dev/null
+++ b/package/mac80211/patches/110-ath5k_stat.patch
@@ -0,0 +1,53 @@
+This patch removes the unnecessary ATH_STAT_MRRETRY flag and turns
+other ATH_STAT_* defines into an enum
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/drivers/net/wireless/ath5k/base.c
++++ b/drivers/net/wireless/ath5k/base.c
+@@ -707,19 +707,6 @@
+ 	ATH5K_DBG(sc, ATH5K_DEBUG_ANY, "devid 0x%x\n", pdev->device);
+ 
+ 	/*
+-	 * Check if the MAC has multi-rate retry support.
+-	 * We do this by trying to setup a fake extended
+-	 * descriptor.  MAC's that don't have support will
+-	 * return false w/o doing anything.  MAC's that do
+-	 * support it will return true w/o doing anything.
+-	 */
+-	ret = ah->ah_setup_mrr_tx_desc(ah, NULL, 0, 0, 0, 0, 0, 0);
+-	if (ret < 0)
+-		goto err;
+-	if (ret > 0)
+-		__set_bit(ATH_STAT_MRRETRY, sc->status);
+-
+-	/*
+ 	 * Reset the key cache since some parts do not
+ 	 * reset the contents on initial power up.
+ 	 */
+--- a/drivers/net/wireless/ath5k/base.h
++++ b/drivers/net/wireless/ath5k/base.h
+@@ -99,6 +99,12 @@
+ #define ATH_CHAN_MAX	(14+14+14+252+20)
+ #endif
+ 
++enum {
++	ATH_STAT_INVALID,		/* disable hardware accesses */
++	ATH_STAT_PROMISC,
++	ATH_STAT_LEDSOFT		/* enable LED gpio status */
++};
++
+ /* Software Carrier, keeps track of the driver state
+  * associated with an instance of a device */
+ struct ath5k_softc {
+@@ -129,10 +135,6 @@
+ 	u16			cachelsz;	/* cache line size */
+ 
+ 	DECLARE_BITMAP(status, 4);
+-#define ATH_STAT_INVALID	0		/* disable hardware accesses */
+-#define ATH_STAT_MRRETRY	1		/* multi-rate retry support */
+-#define ATH_STAT_PROMISC	2
+-#define ATH_STAT_LEDSOFT	3		/* enable LED gpio status */
+ 
+ 	unsigned int		filter_flags;	/* HW flags, AR5K_RX_FILTER_* */
+ 	unsigned int		curmode;	/* current phy mode */
diff --git a/package/mac80211/patches/200-hwkey_len.patch b/package/mac80211/patches/200-hwkey_len.patch
new file mode 100644
index 0000000000..20deeb778b
--- /dev/null
+++ b/package/mac80211/patches/200-hwkey_len.patch
@@ -0,0 +1,183 @@
+Free up 2 bytes in skb->cb to be used for multi-rate retry later.
+Move iv_len and icv_len initialization into key alloc.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -337,8 +337,6 @@
+ 			unsigned long jiffies;
+ 			s8 rts_cts_rate_idx, alt_retry_rate_idx;
+ 			u8 retry_limit;
+-			u8 icv_len;
+-			u8 iv_len;
+ 		} control;
+ 		struct {
+ 			u64 ampdu_ack_map;
+@@ -635,6 +633,8 @@
+  */
+ struct ieee80211_key_conf {
+ 	enum ieee80211_key_alg alg;
++	u8 icv_len;
++	u8 iv_len;
+ 	u8 hw_key_idx;
+ 	u8 flags;
+ 	s8 keyidx;
+--- a/drivers/net/wireless/b43/xmit.c
++++ b/drivers/net/wireless/b43/xmit.c
+@@ -252,7 +252,7 @@
+ 		}
+ 
+ 		/* Hardware appends ICV. */
+-		plcp_fragment_len += info->control.icv_len;
++		plcp_fragment_len += info->control.hw_key->icv_len;
+ 
+ 		key_idx = b43_kidx_to_fw(dev, key_idx);
+ 		mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
+@@ -260,7 +260,7 @@
+ 		mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
+ 			   B43_TXH_MAC_KEYALG;
+ 		wlhdr_len = ieee80211_hdrlen(fctl);
+-		iv_len = min((size_t) info->control.iv_len,
++		iv_len = min((size_t) info->control.hw_key->iv_len,
+ 			     ARRAY_SIZE(txhdr->iv));
+ 		memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
+ 	}
+--- a/drivers/net/wireless/b43legacy/xmit.c
++++ b/drivers/net/wireless/b43legacy/xmit.c
+@@ -243,7 +243,7 @@
+ 
+ 		if (key->enabled) {
+ 			/* Hardware appends ICV. */
+-			plcp_fragment_len += info->control.icv_len;
++			plcp_fragment_len += info->control.hw_key->icv_len;
+ 
+ 			key_idx = b43legacy_kidx_to_fw(dev, key_idx);
+ 			mac_ctl |= (key_idx << B43legacy_TX4_MAC_KEYIDX_SHIFT) &
+@@ -252,7 +252,7 @@
+ 				   B43legacy_TX4_MAC_KEYALG_SHIFT) &
+ 				   B43legacy_TX4_MAC_KEYALG;
+ 			wlhdr_len = ieee80211_hdrlen(wlhdr->frame_control);
+-			iv_len = min((size_t)info->control.iv_len,
++			iv_len = min((size_t)info->control.hw_key->iv_len,
+ 				     ARRAY_SIZE(txhdr->iv));
+ 			memcpy(txhdr->iv, ((u8 *)wlhdr) + wlhdr_len, iv_len);
+ 		} else {
+--- a/net/mac80211/wep.c
++++ b/net/mac80211/wep.c
+@@ -313,9 +313,6 @@
+ {
+ 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ 
+-	info->control.iv_len = WEP_IV_LEN;
+-	info->control.icv_len = WEP_ICV_LEN;
+-
+ 	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
+ 		if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
+ 			return -1;
+--- a/net/mac80211/wpa.c
++++ b/net/mac80211/wpa.c
+@@ -152,9 +152,6 @@
+ 	int len, tail;
+ 	u8 *pos;
+ 
+-	info->control.icv_len = TKIP_ICV_LEN;
+-	info->control.iv_len = TKIP_IV_LEN;
+-
+ 	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
+ 	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
+ 		/* hwaccel - with no need for preallocated room for IV/ICV */
+@@ -374,9 +371,6 @@
+ 	u8 *pos, *pn;
+ 	int i;
+ 
+-	info->control.icv_len = CCMP_MIC_LEN;
+-	info->control.iv_len = CCMP_HDR_LEN;
+-
+ 	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
+ 	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
+ 		/* hwaccel - with no need for preallocated room for CCMP "
+--- a/drivers/net/wireless/ath5k/base.c
++++ b/drivers/net/wireless/ath5k/base.c
+@@ -1164,7 +1164,7 @@
+ 
+ 	if (info->control.hw_key) {
+ 		keyidx = info->control.hw_key->hw_key_idx;
+-		pktlen += info->control.icv_len;
++		pktlen += info->control.hw_key->icv_len;
+ 	}
+ 	ret = ah->ah_setup_tx_desc(ah, ds, pktlen,
+ 		ieee80211_get_hdrlen_from_skb(skb), AR5K_PKT_TYPE_NORMAL,
+--- a/drivers/net/wireless/ath9k/xmit.c
++++ b/drivers/net/wireless/ath9k/xmit.c
+@@ -237,7 +237,7 @@
+ 
+ 	if (tx_info->control.hw_key) {
+ 		txctl->keyix = tx_info->control.hw_key->hw_key_idx;
+-		txctl->frmlen += tx_info->control.icv_len;
++		txctl->frmlen += tx_info->control.hw_key->icv_len;
+ 
+ 		if (tx_info->control.hw_key->alg == ALG_WEP)
+ 			txctl->keytype = ATH9K_KEY_TYPE_WEP;
+--- a/drivers/net/wireless/rt2x00/rt2x00crypto.c
++++ b/drivers/net/wireless/rt2x00/rt2x00crypto.c
+@@ -56,10 +56,10 @@
+ 	 * note that these lengths should only be added when
+ 	 * mac80211 does not generate it.
+ 	 */
+-	overhead += tx_info->control.icv_len;
++	overhead += key->icv_len;
+ 
+ 	if (!(key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
+-		overhead += tx_info->control.iv_len;
++		overhead += key->iv_len;
+ 
+ 	if (!(key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
+ 		if (key->alg == ALG_TKIP)
+--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
++++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
+@@ -374,7 +374,7 @@
+ 	struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
+ 	struct txentry_desc txdesc;
+ 	struct skb_frame_desc *skbdesc;
+-	unsigned int iv_len = IEEE80211_SKB_CB(skb)->control.iv_len;
++	unsigned int iv_len;
+ 
+ 	if (unlikely(rt2x00queue_full(queue)))
+ 		return -EINVAL;
+@@ -410,8 +410,11 @@
+ 	 * the frame so we can provide it to the driver seperately.
+ 	 */
+ 	if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
+-	    !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags))
++	    !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags) &&
++		(IEEE80211_SKB_CB(skb)->control.hw_key != NULL)) {
++		iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
+ 		rt2x00crypto_tx_remove_iv(skb, iv_len);
++	}
+ 
+ 	/*
+ 	 * It could be possible that the queue was corrupted and this
+--- a/net/mac80211/key.c
++++ b/net/mac80211/key.c
+@@ -281,6 +281,20 @@
+ 	key->conf.alg = alg;
+ 	key->conf.keyidx = idx;
+ 	key->conf.keylen = key_len;
++	switch (alg) {
++	case ALG_WEP:
++		key->conf.iv_len = WEP_IV_LEN;
++		key->conf.icv_len = WEP_ICV_LEN;
++		break;
++	case ALG_TKIP:
++		key->conf.iv_len = TKIP_IV_LEN;
++		key->conf.icv_len = TKIP_ICV_LEN;
++		break;
++	case ALG_CCMP:
++		key->conf.iv_len = CCMP_HDR_LEN;
++		key->conf.icv_len = CCMP_MIC_LEN;
++		break;
++	}
+ 	memcpy(key->conf.key, key_data, key_len);
+ 	INIT_LIST_HEAD(&key->list);
+ 	INIT_LIST_HEAD(&key->todo);
diff --git a/package/mac80211/patches/210-mrr.patch b/package/mac80211/patches/210-mrr.patch
new file mode 100644
index 0000000000..3894788245
--- /dev/null
+++ b/package/mac80211/patches/210-mrr.patch
@@ -0,0 +1,183 @@
+This patch adjusts the rate control API to allow multi-rate retry
+if supported by the driver. The ieee80211_hw struct specifies how
+many alternate rate selections the driver supports.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -292,6 +292,20 @@
+ #define IEEE80211_TX_INFO_DRIVER_DATA_PTRS \
+ 	(IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *))
+ 
++/* maximum number of alternate rate retry stages */
++#define IEEE80211_TX_MAX_ALTRATE	3
++
++/**
++ * struct ieee80211_tx_altrate - alternate rate selection/status
++ *
++ * @rate_idx: rate index to attempt to send with
++ * @limit: number of retries before fallback
++ */
++struct ieee80211_tx_altrate {
++	s8 rate_idx;
++	u8 limit;
++};
++
+ /**
+  * struct ieee80211_tx_info - skb transmit information
+  *
+@@ -335,12 +349,14 @@
+ 			struct ieee80211_key_conf *hw_key;
+ 			struct ieee80211_sta *sta;
+ 			unsigned long jiffies;
+-			s8 rts_cts_rate_idx, alt_retry_rate_idx;
++			s8 rts_cts_rate_idx;
+ 			u8 retry_limit;
++			struct ieee80211_tx_altrate retries[IEEE80211_TX_MAX_ALTRATE];
+ 		} control;
+ 		struct {
+ 			u64 ampdu_ack_map;
+ 			int ack_signal;
++			struct ieee80211_tx_altrate retries[IEEE80211_TX_MAX_ALTRATE + 1];
+ 			u8 retry_count;
+ 			bool excessive_retries;
+ 			u8 ampdu_ack_len;
+@@ -828,6 +844,9 @@
+  *	within &struct ieee80211_vif.
+  * @sta_data_size: size (in bytes) of the drv_priv data area
+  *	within &struct ieee80211_sta.
++ *
++ * @max_altrates: maximum number of alternate rate retry stages
++ * @max_altrate_tries: maximum number of tries for each stage
+  */
+ struct ieee80211_hw {
+ 	struct ieee80211_conf conf;
+@@ -844,6 +863,8 @@
+ 	u16 ampdu_queues;
+ 	u16 max_listen_interval;
+ 	s8 max_signal;
++	u8 max_altrates;
++	u8 max_altrate_tries;
+ };
+ 
+ struct ieee80211_hw *wiphy_to_hw(struct wiphy *wiphy);
+@@ -900,11 +921,11 @@
+ 
+ static inline struct ieee80211_rate *
+ ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
+-			     const struct ieee80211_tx_info *c)
++			     const struct ieee80211_tx_info *c, int idx)
+ {
+-	if (c->control.alt_retry_rate_idx < 0)
++	if (c->control.retries[idx].rate_idx < 0)
+ 		return NULL;
+-	return &hw->wiphy->bands[c->band]->bitrates[c->control.alt_retry_rate_idx];
++	return &hw->wiphy->bands[c->band]->bitrates[c->control.retries[idx].rate_idx];
+ }
+ 
+ /**
+--- a/drivers/net/wireless/b43/xmit.c
++++ b/drivers/net/wireless/b43/xmit.c
+@@ -208,7 +208,7 @@
+ 	txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
+ 	rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
+ 	rate_ofdm = b43_is_ofdm_rate(rate);
+-	fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info) ? : txrate;
++	fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
+ 	rate_fb = fbrate->hw_value;
+ 	rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
+ 
+--- a/drivers/net/wireless/b43legacy/xmit.c
++++ b/drivers/net/wireless/b43legacy/xmit.c
+@@ -210,7 +210,7 @@
+ 
+ 	rate = tx_rate->hw_value;
+ 	rate_ofdm = b43legacy_is_ofdm_rate(rate);
+-	rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info) ? : tx_rate;
++	rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : tx_rate;
+ 	rate_fb_ofdm = b43legacy_is_ofdm_rate(rate_fb->hw_value);
+ 
+ 	txhdr->mac_frame_ctl = wlhdr->frame_control;
+--- a/drivers/net/wireless/rtl8180_dev.c
++++ b/drivers/net/wireless/rtl8180_dev.c
+@@ -292,8 +292,8 @@
+ 	entry->plcp_len = cpu_to_le16(plcp_len);
+ 	entry->tx_buf = cpu_to_le32(mapping);
+ 	entry->frame_len = cpu_to_le32(skb->len);
+-	entry->flags2 = info->control.alt_retry_rate_idx >= 0 ?
+-		ieee80211_get_alt_retry_rate(dev, info)->bitrate << 4 : 0;
++	entry->flags2 = info->control.retries[0].rate_idx >= 0 ?
++		ieee80211_get_alt_retry_rate(dev, info, 0)->bitrate << 4 : 0;
+ 	entry->retry_limit = info->control.retry_limit;
+ 	entry->flags = cpu_to_le32(tx_flags);
+ 	__skb_queue_tail(&ring->queue, skb);
+@@ -855,6 +855,7 @@
+ 	priv = dev->priv;
+ 	priv->pdev = pdev;
+ 
++	dev->max_altrates = 1;
+ 	SET_IEEE80211_DEV(dev, &pdev->dev);
+ 	pci_set_drvdata(pdev, dev);
+ 
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -454,15 +454,16 @@
+ 		if (unlikely(rsel.probe_idx >= 0)) {
+ 			info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
+ 			tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
+-			info->control.alt_retry_rate_idx = tx->rate_idx;
++			info->control.retries[0].rate_idx = tx->rate_idx;
++			info->control.retries[0].limit = tx->local->hw.max_altrate_tries;
+ 			tx->rate_idx = rsel.probe_idx;
+-		} else
+-			info->control.alt_retry_rate_idx = -1;
++		} else if (info->control.retries[0].limit == 0)
++			info->control.retries[0].rate_idx = -1;
+ 
+ 		if (unlikely(tx->rate_idx < 0))
+ 			return TX_DROP;
+ 	} else
+-		info->control.alt_retry_rate_idx = -1;
++		info->control.retries[0].rate_idx = -1;
+ 
+ 	if (tx->sdata->bss_conf.use_cts_prot &&
+ 	    (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
+@@ -521,7 +522,7 @@
+ 		 * frames.
+ 		 * TODO: The last fragment could still use multiple retry
+ 		 * rates. */
+-		info->control.alt_retry_rate_idx = -1;
++		info->control.retries[0].rate_idx = -1;
+ 	}
+ 
+ 	/* Use CTS protection for unicast frames sent using extended rates if
+@@ -551,7 +552,7 @@
+ 		int idx;
+ 
+ 		/* Do not use multiple retry rates when using RTS/CTS */
+-		info->control.alt_retry_rate_idx = -1;
++		info->control.retries[0].rate_idx = -1;
+ 
+ 		/* Use min(data rate, max base rate) as CTS/RTS rate */
+ 		rate = &sband->bitrates[tx->rate_idx];
+--- a/drivers/net/wireless/b43/main.c
++++ b/drivers/net/wireless/b43/main.c
+@@ -4588,6 +4588,7 @@
+ 		BIT(NL80211_IFTYPE_ADHOC);
+ 
+ 	hw->queues = b43_modparam_qos ? 4 : 1;
++	hw->max_altrates = 1;
+ 	SET_IEEE80211_DEV(hw, dev->dev);
+ 	if (is_valid_ether_addr(sprom->et1mac))
+ 		SET_IEEE80211_PERM_ADDR(hw, sprom->et1mac);
+--- a/drivers/net/wireless/b43legacy/main.c
++++ b/drivers/net/wireless/b43legacy/main.c
+@@ -3710,6 +3710,7 @@
+ 		BIT(NL80211_IFTYPE_WDS) |
+ 		BIT(NL80211_IFTYPE_ADHOC);
+ 	hw->queues = 1; /* FIXME: hardware has more queues */
++	hw->max_altrates = 1;
+ 	SET_IEEE80211_DEV(hw, dev->dev);
+ 	if (is_valid_ether_addr(sprom->et1mac))
+ 		SET_IEEE80211_PERM_ADDR(hw, sprom->et1mac);
diff --git a/package/mac80211/patches/250-ath5k_mrr.patch b/package/mac80211/patches/250-ath5k_mrr.patch
new file mode 100644
index 0000000000..ff15fd4b70
--- /dev/null
+++ b/package/mac80211/patches/250-ath5k_mrr.patch
@@ -0,0 +1,208 @@
+Clean up the tx status reporting, fix retry counters (short retries are
+virtual collisions, not actual retries). Implement multi-rate retry
+support.
+This also fixes strong throughput fluctuations with rc80211_pid
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/drivers/net/wireless/ath5k/base.c
++++ b/drivers/net/wireless/ath5k/base.c
+@@ -530,6 +530,12 @@
+ 		goto err_irq;
+ 	}
+ 
++	/* set up multi-rate retry capabilities */
++	if (sc->ah->ah_version == AR5K_AR5212) {
++		hw->max_altrates = 3;
++		hw->max_altrate_tries = 11;
++	}
++
+ 	/* Finish private driver data initialization */
+ 	ret = ath5k_attach(pdev, hw);
+ 	if (ret)
+@@ -1149,7 +1155,9 @@
+ 	struct sk_buff *skb = bf->skb;
+ 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ 	unsigned int pktlen, flags, keyidx = AR5K_TXKEYIX_INVALID;
+-	int ret;
++	struct ieee80211_rate *rate;
++	unsigned int mrr_rate[3], mrr_tries[3];
++	int i, ret;
+ 
+ 	flags = AR5K_TXDESC_INTREQ | AR5K_TXDESC_CLRDMASK;
+ 
+@@ -1174,6 +1182,22 @@
+ 	if (ret)
+ 		goto err_unmap;
+ 
++	memset(mrr_rate, 0, sizeof(mrr_rate));
++	memset(mrr_tries, 0, sizeof(mrr_tries));
++	for (i = 0; i < 3; i++) {
++		rate = ieee80211_get_alt_retry_rate(sc->hw, info, i);
++		if (!rate)
++			break;
++
++		mrr_rate[i] = rate->hw_value;
++		mrr_tries[i] = info->control.retries[i].limit;
++	}
++
++	ah->ah_setup_mrr_tx_desc(ah, ds,
++		mrr_rate[0], mrr_tries[0],
++		mrr_rate[1], mrr_tries[1],
++		mrr_rate[2], mrr_tries[2]);
++
+ 	ds->ds_link = 0;
+ 	ds->ds_data = bf->skbaddr;
+ 
+@@ -1790,7 +1814,7 @@
+ 	struct ath5k_desc *ds;
+ 	struct sk_buff *skb;
+ 	struct ieee80211_tx_info *info;
+-	int ret;
++	int i, ret;
+ 
+ 	spin_lock(&txq->lock);
+ 	list_for_each_entry_safe(bf, bf0, &txq->q, list) {
+@@ -1812,7 +1836,25 @@
+ 		pci_unmap_single(sc->pdev, bf->skbaddr, skb->len,
+ 				PCI_DMA_TODEVICE);
+ 
+-		info->status.retry_count = ts.ts_shortretry + ts.ts_longretry / 6;
++		memset(&info->status, 0, sizeof(info->status));
++		info->tx_rate_idx = ath5k_hw_to_driver_rix(sc,
++				ts.ts_rate[ts.ts_final_idx]);
++		info->status.retry_count = ts.ts_longretry;
++
++		for (i = 0; i < 4; i++) {
++			struct ieee80211_tx_altrate *r =
++				&info->status.retries[i];
++
++			if (ts.ts_rate[i]) {
++				r->rate_idx = ath5k_hw_to_driver_rix(sc, ts.ts_rate[i]);
++				r->limit = ts.ts_retry[i];
++			} else {
++				r->rate_idx = -1;
++				r->limit = 0;
++			}
++		}
++
++		info->status.excessive_retries = 0;
+ 		if (unlikely(ts.ts_status)) {
+ 			sc->ll_stats.dot11ACKFailureCount++;
+ 			if (ts.ts_status & AR5K_TXERR_XRETRY)
+--- a/drivers/net/wireless/ath5k/desc.c
++++ b/drivers/net/wireless/ath5k/desc.c
+@@ -318,6 +318,15 @@
+ 	return 0;
+ }
+ 
++/* no mrr support for cards older than 5212 */
++static int
++ath5k_hw_setup_no_mrr(struct ath5k_hw *ah, struct ath5k_desc *desc,
++	unsigned int tx_rate1, u_int tx_tries1, u_int tx_rate2,
++	u_int tx_tries2, unsigned int tx_rate3, u_int tx_tries3)
++{
++	return 0;
++}
++
+ /*
+  * Proccess the tx status descriptor on 5210/5211
+  */
+@@ -352,8 +361,10 @@
+ 		AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH);
+ 	ts->ts_antenna = 1;
+ 	ts->ts_status = 0;
+-	ts->ts_rate = AR5K_REG_MS(tx_ctl->tx_control_0,
++	ts->ts_rate[0] = AR5K_REG_MS(tx_ctl->tx_control_0,
+ 		AR5K_2W_TX_DESC_CTL0_XMIT_RATE);
++	ts->ts_retry[0] = ts->ts_longretry;
++	ts->ts_final_idx = 0;
+ 
+ 	if (!(tx_status->tx_status_0 & AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK)) {
+ 		if (tx_status->tx_status_0 &
+@@ -405,29 +416,43 @@
+ 		AR5K_DESC_TX_STATUS1_XMIT_ANTENNA) ? 2 : 1;
+ 	ts->ts_status = 0;
+ 
+-	switch (AR5K_REG_MS(tx_status->tx_status_1,
+-			AR5K_DESC_TX_STATUS1_FINAL_TS_INDEX)) {
+-	case 0:
+-		ts->ts_rate = tx_ctl->tx_control_3 &
+-			AR5K_4W_TX_DESC_CTL3_XMIT_RATE0;
+-		break;
++	ts->ts_final_idx = AR5K_REG_MS(tx_status->tx_status_1,
++			AR5K_DESC_TX_STATUS1_FINAL_TS_INDEX);
++
++	/* The longretry counter has the number of un-acked retries
++	 * for the final rate. To get the total number of retries
++	 * we have to add the retry counters for the other rates
++	 * as well
++	 */
++	ts->ts_retry[ts->ts_final_idx] = ts->ts_longretry;
++	switch (ts->ts_final_idx) {
++	case 3:
++		ts->ts_rate[3] = AR5K_REG_MS(tx_ctl->tx_control_3,
++			AR5K_4W_TX_DESC_CTL3_XMIT_RATE3);
++
++		ts->ts_retry[2] = AR5K_REG_MS(tx_ctl->tx_control_2,
++			AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2);
++		ts->ts_longretry += ts->ts_retry[2];
++		/* fall through */
++	case 2:
++		ts->ts_rate[2] = AR5K_REG_MS(tx_ctl->tx_control_3,
++			AR5K_4W_TX_DESC_CTL3_XMIT_RATE2);
++
++		ts->ts_retry[1] = AR5K_REG_MS(tx_ctl->tx_control_2,
++			AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
++		ts->ts_longretry += ts->ts_retry[1];
++		/* fall through */
+ 	case 1:
+-		ts->ts_rate = AR5K_REG_MS(tx_ctl->tx_control_3,
++		ts->ts_rate[1] = AR5K_REG_MS(tx_ctl->tx_control_3,
+ 			AR5K_4W_TX_DESC_CTL3_XMIT_RATE1);
+-		ts->ts_longretry += AR5K_REG_MS(tx_ctl->tx_control_2,
++
++		ts->ts_retry[0] = AR5K_REG_MS(tx_ctl->tx_control_2,
+ 			AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
+-		break;
+-	case 2:
+-		ts->ts_rate = AR5K_REG_MS(tx_ctl->tx_control_3,
+-			AR5K_4W_TX_DESC_CTL3_XMIT_RATE2);
+-		ts->ts_longretry += AR5K_REG_MS(tx_ctl->tx_control_2,
+-			AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2);
+-		break;
+-	case 3:
+-		ts->ts_rate = AR5K_REG_MS(tx_ctl->tx_control_3,
+-			AR5K_4W_TX_DESC_CTL3_XMIT_RATE3);
+-		ts->ts_longretry += AR5K_REG_MS(tx_ctl->tx_control_2,
+-			AR5K_4W_TX_DESC_CTL2_XMIT_TRIES3);
++		ts->ts_longretry += ts->ts_retry[0];
++		/* fall through */
++	case 0:
++		ts->ts_rate[0] = tx_ctl->tx_control_3 &
++			AR5K_4W_TX_DESC_CTL3_XMIT_RATE0;
+ 		break;
+ 	}
+ 
+@@ -653,7 +678,7 @@
+ 	} else {
+ 		ah->ah_setup_rx_desc = ath5k_hw_setup_rx_desc;
+ 		ah->ah_setup_tx_desc = ath5k_hw_setup_2word_tx_desc;
+-		ah->ah_setup_mrr_tx_desc = ath5k_hw_setup_mrr_tx_desc;
++		ah->ah_setup_mrr_tx_desc = ath5k_hw_setup_no_mrr;
+ 		ah->ah_proc_tx_desc = ath5k_hw_proc_2word_tx_status;
+ 	}
+ 
+--- a/drivers/net/wireless/ath5k/ath5k.h
++++ b/drivers/net/wireless/ath5k/ath5k.h
+@@ -418,7 +418,9 @@
+ 	u16	ts_seqnum;
+ 	u16	ts_tstamp;
+ 	u8	ts_status;
+-	u8	ts_rate;
++	u8	ts_rate[4];
++	u8	ts_retry[4];
++	u8	ts_final_idx;
+ 	s8	ts_rssi;
+ 	u8	ts_shortretry;
+ 	u8	ts_longretry;
diff --git a/package/mac80211/patches/299-compat_minstrel.patch b/package/mac80211/patches/299-compat_minstrel.patch
new file mode 100644
index 0000000000..7f50197806
--- /dev/null
+++ b/package/mac80211/patches/299-compat_minstrel.patch
@@ -0,0 +1,32 @@
+--- a/config.mk
++++ b/config.mk
+@@ -47,8 +47,9 @@
+ endif # build check
+ endif # kernel Makefile check
+ 
+-CONFIG_MAC80211_RC_DEFAULT=pid
++CONFIG_MAC80211_RC_DEFAULT=minstrel
+ CONFIG_MAC80211_RC_PID=y
++CONFIG_MAC80211_RC_MINSTREL=y
+ 
+ # enable mesh networking too
+ CONFIG_MAC80211_MESH=y
+--- a/include/linux/compat_autoconf.h
++++ b/include/linux/compat_autoconf.h
+@@ -18,11 +18,14 @@
+ #define CONFIG_MAC80211 1
+ #endif /* CONFIG_MAC80211 */ 
+ #ifndef CONFIG_MAC80211_RC_DEFAULT
+-#define CONFIG_MAC80211_RC_DEFAULT "pid"
+-#endif /* CONFIG_MAC80211_RC_DEFAULT */ 
++#define CONFIG_MAC80211_RC_DEFAULT "minstrel"
++#endif /* CONFIG_MAC80211_RC_DEFAULT */
+ #ifndef CONFIG_MAC80211_RC_PID
+ #define CONFIG_MAC80211_RC_PID 1
+ #endif /* CONFIG_MAC80211_RC_PID */ 
++#ifndef CONFIG_MAC80211_RC_MINSTREL
++#define CONFIG_MAC80211_RC_MINSTREL 1
++#endif /* CONFIG_MAC80211_RC_MINSTREL */
+ #ifndef CONFIG_MAC80211_MESH
+ #define CONFIG_MAC80211_MESH 1
+ #endif /* CONFIG_MAC80211_MESH */ 
diff --git a/package/mac80211/patches/300-minstrel.patch b/package/mac80211/patches/300-minstrel.patch
new file mode 100644
index 0000000000..ee1887a6ce
--- /dev/null
+++ b/package/mac80211/patches/300-minstrel.patch
@@ -0,0 +1,928 @@
+--- /dev/null
++++ b/net/mac80211/rc80211_minstrel.c
+@@ -0,0 +1,583 @@
++/*
++ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ * Based on minstrel.c:
++ *   Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
++ *   Sponsored by Indranet Technologies Ltd
++ *
++ * Based on sample.c:
++ *   Copyright (c) 2005 John Bicket
++ *   All rights reserved.
++ *
++ *   Redistribution and use in source and binary forms, with or without
++ *   modification, are permitted provided that the following conditions
++ *   are met:
++ *   1. Redistributions of source code must retain the above copyright
++ *      notice, this list of conditions and the following disclaimer,
++ *      without modification.
++ *   2. Redistributions in binary form must reproduce at minimum a disclaimer
++ *      similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
++ *      redistribution must be conditioned upon including a substantially
++ *      similar Disclaimer requirement for further binary redistribution.
++ *   3. Neither the names of the above-listed copyright holders nor the names
++ *      of any contributors may be used to endorse or promote products derived
++ *      from this software without specific prior written permission.
++ *
++ *   Alternatively, this software may be distributed under the terms of the
++ *   GNU General Public License ("GPL") version 2 as published by the Free
++ *   Software Foundation.
++ *
++ *   NO WARRANTY
++ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
++ *   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
++ *   LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
++ *   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
++ *   THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
++ *   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
++ *   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
++ *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
++ *   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
++ *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
++ *   THE POSSIBILITY OF SUCH DAMAGES.
++ */
++#include <linux/netdevice.h>
++#include <linux/types.h>
++#include <linux/skbuff.h>
++#include <linux/debugfs.h>
++#include <linux/random.h>
++#include <linux/ieee80211.h>
++#include <net/mac80211.h>
++#include "rate.h"
++#include "rc80211_minstrel.h"
++
++#define SAMPLE_COLUMNS	10
++#define SAMPLE_TBL(_mi, _idx, _col) \
++		_mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col]
++
++/* convert mac80211 rate index to local array index */
++static inline int
++rix_to_ndx(struct minstrel_sta_info *mi, int rix)
++{
++	int i = rix;
++	for (i = rix; i >= 0; i--)
++		if (mi->r[i].rix == rix)
++			break;
++	WARN_ON(mi->r[i].rix != rix);
++	return i;
++}
++
++static inline bool
++use_low_rate(struct sk_buff *skb)
++{
++	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
++	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
++	u16 fc;
++
++	fc = le16_to_cpu(hdr->frame_control);
++
++	return ((info->flags & IEEE80211_TX_CTL_NO_ACK) ||
++		(fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
++		is_multicast_ether_addr(hdr->addr1));
++}
++
++
++static void
++minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
++{
++	u32 max_tp = 0, index_max_tp = 0, index_max_tp2 = 0;
++	u32 max_prob = 0, index_max_prob = 0;
++	u32 usecs;
++	u32 p;
++	int i;
++
++	mi->stats_update = jiffies;
++	for (i = 0; i < mi->n_rates; i++) {
++		struct minstrel_rate *mr = &mi->r[i];
++
++		usecs = mr->perfect_tx_time;
++		if (!usecs)
++			usecs = 1000000;
++
++		/* To avoid rounding issues, probabilities scale from 0 (0%)
++		 * to 18000 (100%) */
++		if (mr->attempts) {
++			p = (mr->success * 18000) / mr->attempts;
++			mr->succ_hist += mr->success;
++			mr->att_hist += mr->attempts;
++			mr->cur_prob = p;
++			p = ((p * (100 - mp->ewma_level)) + (mr->probability *
++				mp->ewma_level)) / 100;
++			mr->probability = p;
++			mr->cur_tp = p * (1000000 / usecs);
++		}
++
++		mr->last_success = mr->success;
++		mr->last_attempts = mr->attempts;
++		mr->success = 0;
++		mr->attempts = 0;
++
++		/* Sample less often below the 10% chance of success.
++		 * Sample less often above the 95% chance of success. */
++		if ((mr->probability > 17100) || (mr->probability < 1800)) {
++			mr->adjusted_retry_count = mr->retry_count >> 1;
++			if (mr->adjusted_retry_count > 2)
++				mr->adjusted_retry_count = 2;
++		} else {
++			mr->adjusted_retry_count = mr->retry_count;
++		}
++		if (!mr->adjusted_retry_count)
++			mr->adjusted_retry_count = 2;
++	}
++
++	for (i = 0; i < mi->n_rates; i++) {
++		struct minstrel_rate *mr = &mi->r[i];
++		if (max_tp < mr->cur_tp) {
++			index_max_tp = i;
++			max_tp = mr->cur_tp;
++		}
++		if (max_prob < mr->probability) {
++			index_max_prob = i;
++			max_prob = mr->probability;
++		}
++	}
++
++	max_tp = 0;
++	for (i = 0; i < mi->n_rates; i++) {
++		struct minstrel_rate *mr = &mi->r[i];
++
++		if (i == index_max_tp)
++			continue;
++
++		if (max_tp < mr->cur_tp) {
++			index_max_tp2 = i;
++			max_tp = mr->cur_tp;
++		}
++	}
++	mi->max_tp_rate = index_max_tp;
++	mi->max_tp_rate2 = index_max_tp2;
++	mi->max_prob_rate = index_max_prob;
++}
++
++static void
++minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband,
++                   struct ieee80211_sta *sta, void *priv_sta,
++		   struct sk_buff *skb)
++{
++	struct minstrel_sta_info *mi = priv_sta;
++	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
++	struct ieee80211_tx_altrate *ar = info->status.retries;
++	struct minstrel_priv *mp = priv;
++	int i, ndx, tries;
++	int success = 0;
++
++	if (!info->status.excessive_retries)
++		success = 1;
++
++	if (!mp->has_mrr || (ar[0].rate_idx < 0)) {
++		ndx = rix_to_ndx(mi, info->tx_rate_idx);
++		tries = info->status.retry_count + 1;
++		mi->r[ndx].success += success;
++		mi->r[ndx].attempts += tries;
++		return;
++	}
++
++	for (i = 0; i < 4; i++) {
++		if (ar[i].rate_idx < 0)
++			break;
++
++		ndx = rix_to_ndx(mi, ar[i].rate_idx);
++		mi->r[ndx].attempts += ar[i].limit + 1;
++
++		if ((i != 3) && (ar[i + 1].rate_idx < 0))
++			mi->r[ndx].success += success;
++	}
++
++	if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0))
++		mi->sample_count++;
++
++	if (mi->sample_deferred > 0)
++		mi->sample_deferred--;
++}
++
++
++static inline unsigned int
++minstrel_get_retry_count(struct minstrel_rate *mr,
++                         struct ieee80211_tx_info *info)
++{
++	unsigned int retry = mr->adjusted_retry_count;
++
++	if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
++		retry = max(2U, min(mr->retry_count_rtscts, retry));
++	else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
++		retry = max(2U, min(mr->retry_count_cts, retry));
++	return retry;
++}
++
++
++static int
++minstrel_get_next_sample(struct minstrel_sta_info *mi)
++{
++	unsigned int sample_ndx;
++	sample_ndx = SAMPLE_TBL(mi, mi->sample_idx, mi->sample_column);
++	mi->sample_idx++;
++	if (mi->sample_idx > (mi->n_rates - 2)) {
++		mi->sample_idx = 0;
++		mi->sample_column++;
++		if (mi->sample_column >= SAMPLE_COLUMNS)
++			mi->sample_column = 0;
++	}
++	return sample_ndx;
++}
++
++void
++minstrel_get_rate(void *priv, struct ieee80211_supported_band *sband,
++                  struct ieee80211_sta *sta, void *priv_sta,
++                  struct sk_buff *skb, struct rate_selection *sel)
++{
++	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
++	struct minstrel_sta_info *mi = priv_sta;
++	struct minstrel_priv *mp = priv;
++	struct ieee80211_tx_altrate *ar = info->control.retries;
++	unsigned int ndx, sample_ndx = 0;
++	bool mrr;
++	bool sample_slower = false;
++	bool sample = false;
++	int i, delta;
++	int mrr_ndx[3];
++	int sample_rate;
++
++	if (!sta || !mi || use_low_rate(skb)) {
++		sel->rate_idx = rate_lowest_index(sband, sta);
++		return;
++	}
++
++	mrr = mp->has_mrr;
++
++	/* mac80211 does not allow mrr for RTS/CTS */
++	if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
++	    (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
++		mrr = false;
++
++	if (time_after(jiffies, mi->stats_update + (mp->update_interval *
++			HZ) / 1000))
++		minstrel_update_stats(mp, mi);
++
++	ndx = mi->max_tp_rate;
++
++	if (mrr)
++		sample_rate = mp->lookaround_rate_mrr;
++	else
++		sample_rate = mp->lookaround_rate;
++
++	mi->packet_count++;
++	delta = (mi->packet_count * sample_rate / 100) -
++			(mi->sample_count + mi->sample_deferred / 2);
++
++	/* delta > 0: sampling required */
++	if (delta > 0) {
++		if (mi->packet_count >= 10000) {
++			mi->sample_deferred = 0;
++			mi->sample_count = 0;
++			mi->packet_count = 0;
++		} else if (delta > mi->n_rates * 2) {
++			/* With multi-rate retry, not every planned sample
++			 * attempt actually gets used, due to the way the retry
++			 * chain is set up - [max_tp,sample,prob,lowest] for
++			 * sample_rate < max_tp.
++			 *
++			 * If there's too much sampling backlog and the link
++			 * starts getting worse, minstrel would start bursting
++			 * out lots of sampling frames, which would result
++			 * in a large throughput loss. */
++			mi->sample_count += (delta - mi->n_rates * 2);
++		}
++
++		sample_ndx = minstrel_get_next_sample(mi);
++		sample = true;
++		sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time >
++			mi->r[ndx].perfect_tx_time);
++
++		if (!sample_slower) {
++			ndx = sample_ndx;
++			mi->sample_count++;
++		} else {
++			/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
++			 * packets that have the sampling rate deferred to the
++			 * second MRR stage. Increase the sample counter only
++			 * if the deferred sample rate was actually used.
++			 * Use the sample_deferred counter to make sure that
++			 * the sampling is not done in large bursts */
++			info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
++			mi->sample_deferred++;
++		}
++	}
++	sel->rate_idx = mi->r[ndx].rix;
++	info->control.retry_limit = minstrel_get_retry_count(&mi->r[ndx], info);
++
++	if (!mrr) {
++		ar[0].rate_idx = mi->lowest_rix;
++		ar[0].limit = mp->max_retry;
++		ar[1].rate_idx = -1;
++		return;
++	}
++
++	/* MRR setup */
++	if (sample) {
++		if (sample_slower)
++			mrr_ndx[0] = sample_ndx;
++		else
++			mrr_ndx[0] = mi->max_tp_rate;
++	} else {
++		mrr_ndx[0] = mi->max_tp_rate2;
++	}
++	mrr_ndx[1] = mi->max_prob_rate;
++	mrr_ndx[2] = 0;
++	for (i = 0; i < 3; i++) {
++		ar[i].rate_idx = mi->r[mrr_ndx[i]].rix;
++		ar[i].limit = mi->r[mrr_ndx[i]].adjusted_retry_count;
++	}
++}
++
++
++static void
++calc_rate_durations(struct minstrel_sta_info *mi, struct ieee80211_local *local,
++                    struct minstrel_rate *d, struct ieee80211_rate *rate)
++{
++	int erp = !!(rate->flags & IEEE80211_RATE_ERP_G);
++
++	d->perfect_tx_time = ieee80211_frame_duration(local, 1200,
++			rate->bitrate, erp, 1);
++	d->ack_time = ieee80211_frame_duration(local, 10,
++			rate->bitrate, erp, 1);
++}
++
++static void
++init_sample_table(struct minstrel_sta_info *mi)
++{
++	unsigned int i, col, new_idx;
++	unsigned int n_srates = mi->n_rates - 1;
++	u8 rnd[8];
++
++	mi->sample_column = 0;
++	mi->sample_idx = 0;
++	memset(mi->sample_table, 0, SAMPLE_COLUMNS * mi->n_rates);
++
++	for (col = 0; col < SAMPLE_COLUMNS; col++) {
++		for (i = 0; i < n_srates; i++) {
++			get_random_bytes(rnd, sizeof(rnd));
++			new_idx = (i + rnd[i & 7]) % n_srates;
++
++			while (SAMPLE_TBL(mi, new_idx, col) != 0)
++				new_idx = (new_idx + 1) % n_srates;
++
++			/* Don't sample the slowest rate (i.e. slowest base
++			 * rate). We must presume that the slowest rate works
++			 * fine, or else other management frames will also be
++			 * failing and the link will break */
++			SAMPLE_TBL(mi, new_idx, col) = i + 1;
++		}
++	}
++}
++
++static void
++minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
++               struct ieee80211_sta *sta, void *priv_sta)
++{
++	struct minstrel_sta_info *mi = priv_sta;
++	struct minstrel_priv *mp = priv;
++	struct minstrel_rate *mr_ctl;
++	unsigned int i, n = 0;
++	unsigned int t_slot = 9; /* FIXME: get real slot time */
++
++	mi->lowest_rix = rate_lowest_index(sband, sta);
++	mr_ctl = &mi->r[rix_to_ndx(mi, mi->lowest_rix)];
++	mi->sp_ack_dur = mr_ctl->ack_time;
++
++	for (i = 0; i < sband->n_bitrates; i++) {
++		struct minstrel_rate *mr = &mi->r[n];
++		unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0;
++		unsigned int tx_time_single;
++		unsigned int cw = mp->cw_min;
++
++		if (!rate_supported(sta, sband->band, i))
++			continue;
++		n++;
++		memset(mr, 0, sizeof(*mr));
++
++		mr->rix = i;
++		mr->bitrate = sband->bitrates[i].bitrate / 5;
++		calc_rate_durations(mi, hw_to_local(mp->hw), mr,
++				&sband->bitrates[i]);
++
++		/* calculate maximum number of retransmissions before
++		 * fallback (based on maximum segment size) */
++		mr->retry_count = 1;
++		mr->retry_count_cts = 1;
++		mr->retry_count_rtscts = 1;
++		tx_time = mr->perfect_tx_time + mi->sp_ack_dur;
++		do {
++			/* add one retransmission */
++			tx_time_single = mr->ack_time + mr->perfect_tx_time;
++
++			/* contention window */
++			tx_time_single += t_slot + min(cw, mp->cw_max);
++			cw = (cw + 1) << 1;
++
++			tx_time += tx_time_single;
++			tx_time_cts += tx_time_single + mi->sp_ack_dur;
++			tx_time_rtscts += tx_time_single + 2 * mi->sp_ack_dur;
++			if ((tx_time_cts < mp->segment_size) &&
++				(mr->retry_count_cts < mp->max_retry))
++				mr->retry_count_cts++;
++			if ((tx_time_rtscts < mp->segment_size) &&
++				(mr->retry_count_rtscts < mp->max_retry))
++				mr->retry_count_rtscts++;
++		} while ((tx_time < mp->segment_size) &&
++				(++mr->retry_count < mp->max_retry));
++		mr->adjusted_retry_count = mr->retry_count;
++	}
++
++	for (i = n; i < sband->n_bitrates; i++) {
++		struct minstrel_rate *mr = &mi->r[i];
++		mr->rix = -1;
++	}
++
++	mi->n_rates = n;
++	mi->stats_update = jiffies;
++
++	init_sample_table(mi);
++}
++
++static void *
++minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
++{
++	struct ieee80211_supported_band *sband;
++	struct minstrel_sta_info *mi;
++	struct minstrel_priv *mp = priv;
++	struct ieee80211_hw *hw = mp->hw;
++	int max_rates = 0;
++	int i;
++
++	mi = kzalloc(sizeof(struct minstrel_sta_info), gfp);
++	if (!mi)
++		return NULL;
++
++	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
++		sband = hw->wiphy->bands[hw->conf.channel->band];
++		if (sband->n_bitrates > max_rates)
++			max_rates = sband->n_bitrates;
++	}
++
++	mi->r = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
++	if (!mi->r)
++		goto error;
++
++	mi->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
++	if (!mi->sample_table)
++		goto error1;
++
++	mi->stats_update = jiffies;
++	return mi;
++
++error1:
++	kfree(mi->r);
++error:
++	kfree(mi);
++	return NULL;
++}
++
++static void
++minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
++{
++	struct minstrel_sta_info *mi = priv_sta;
++
++	kfree(mi->sample_table);
++	kfree(mi->r);
++	kfree(mi);
++}
++
++static void
++minstrel_clear(void *priv)
++{
++}
++
++static void *
++minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
++{
++	struct minstrel_priv *mp;
++
++	mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
++	if (!mp)
++		return NULL;
++
++	/* contention window settings
++	 * Just an approximation. Using the per-queue values would complicate
++	 * the calculations and is probably unnecessary */
++	mp->cw_min = 15;
++	mp->cw_max = 1023;
++
++	/* number of packets (in %) to use for sampling other rates
++	 * sample less often for non-mrr packets, because the overhead
++	 * is much higher than with mrr */
++	mp->lookaround_rate = 5;
++	mp->lookaround_rate_mrr = 10;
++
++	/* moving average weight for EWMA */
++	mp->ewma_level = 75;
++
++	/* maximum time that the hw is allowed to stay in one MRR segment */
++	mp->segment_size = 6000;
++
++	if (hw->max_altrate_tries > 0)
++		mp->max_retry = hw->max_altrate_tries;
++	else
++		/* safe default, does not necessarily have to match hw properties */
++		mp->max_retry = 7;
++
++	if (hw->max_altrates >= 3)
++		mp->has_mrr = true;
++
++	mp->hw = hw;
++	mp->update_interval = 100;
++
++	return mp;
++}
++
++static void
++minstrel_free(void *priv)
++{
++	kfree(priv);
++}
++
++static struct rate_control_ops mac80211_minstrel = {
++	.name = "minstrel",
++	.tx_status = minstrel_tx_status,
++	.get_rate = minstrel_get_rate,
++	.rate_init = minstrel_rate_init,
++	.clear = minstrel_clear,
++	.alloc = minstrel_alloc,
++	.free = minstrel_free,
++	.alloc_sta = minstrel_alloc_sta,
++	.free_sta = minstrel_free_sta,
++#ifdef CONFIG_MAC80211_DEBUGFS
++	.add_sta_debugfs = minstrel_add_sta_debugfs,
++	.remove_sta_debugfs = minstrel_remove_sta_debugfs,
++#endif
++};
++
++int __init
++rc80211_minstrel_init(void)
++{
++	return ieee80211_rate_control_register(&mac80211_minstrel);
++}
++
++void
++rc80211_minstrel_exit(void)
++{
++	ieee80211_rate_control_unregister(&mac80211_minstrel);
++}
++
+--- a/net/mac80211/Makefile
++++ b/net/mac80211/Makefile
+@@ -41,4 +41,8 @@
+ rc80211_pid-y := rc80211_pid_algo.o
+ rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o
+ 
++rc80211_minstrel-y := rc80211_minstrel.o
++rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o
++
+ mac80211-$(CONFIG_MAC80211_RC_PID) += $(rc80211_pid-y)
++mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
+--- a/net/mac80211/main.c
++++ b/net/mac80211/main.c
+@@ -1015,6 +1015,10 @@
+ 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
+ 	             IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
+ 
++	ret = rc80211_minstrel_init();
++	if (ret)
++		return ret;
++
+ 	ret = rc80211_pid_init();
+ 	if (ret)
+ 		return ret;
+@@ -1027,6 +1031,7 @@
+ static void __exit ieee80211_exit(void)
+ {
+ 	rc80211_pid_exit();
++	rc80211_minstrel_exit();
+ 
+ 	/*
+ 	 * For key todo, it'll be empty by now but the work
+--- a/net/mac80211/rate.h
++++ b/net/mac80211/rate.h
+@@ -125,4 +125,18 @@
+ }
+ #endif
+ 
++#ifdef CONFIG_MAC80211_RC_MINSTREL
++extern int rc80211_minstrel_init(void);
++extern void rc80211_minstrel_exit(void);
++#else
++static inline int rc80211_minstrel_init(void)
++{
++	return 0;
++}
++static inline void rc80211_minstrel_exit(void)
++{
++}
++#endif
++
++
+ #endif /* IEEE80211_RATE_H */
+--- /dev/null
++++ b/net/mac80211/rc80211_minstrel.h
+@@ -0,0 +1,85 @@
++/*
++ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++
++#ifndef __RC_MINSTREL_H
++#define __RC_MINSTREL_H
++
++struct minstrel_rate {
++	int bitrate;
++	int rix;
++
++	unsigned int perfect_tx_time;
++	unsigned int ack_time;
++
++	unsigned int retry_count;
++	unsigned int retry_count_cts;
++	unsigned int retry_count_rtscts;
++	unsigned int adjusted_retry_count;
++
++	u32 success;
++	u32 attempts;
++	u32 last_attempts;
++	u32 last_success;
++
++	/* parts per thousand */
++	u32 cur_prob;
++	u32 probability;
++
++	/* per-rate throughput */
++	u32 cur_tp;
++	u32 throughput;
++
++	u64 succ_hist;
++	u64 att_hist;
++};
++
++struct minstrel_sta_info {
++	unsigned long stats_update;
++	unsigned int sp_ack_dur;
++	unsigned int rate_avg;
++
++	unsigned int lowest_rix;
++
++	unsigned int max_tp_rate;
++	unsigned int max_tp_rate2;
++	unsigned int max_prob_rate;
++	unsigned int packet_count;
++	unsigned int sample_count;
++	int sample_deferred;
++
++	unsigned int sample_idx;
++	unsigned int sample_column;
++
++	int n_rates;
++	struct minstrel_rate *r;
++
++	/* sampling table */
++	u8 *sample_table;
++
++#ifdef CONFIG_MAC80211_DEBUGFS
++	struct dentry *dbg_stats;
++#endif
++};
++
++struct minstrel_priv {
++	struct ieee80211_hw *hw;
++	bool has_mrr;
++	unsigned int cw_min;
++	unsigned int cw_max;
++	unsigned int max_retry;
++	unsigned int ewma_level;
++	unsigned int segment_size;
++	unsigned int update_interval;
++	unsigned int lookaround_rate;
++	unsigned int lookaround_rate_mrr;
++};
++
++void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
++void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
++
++#endif
+--- /dev/null
++++ b/net/mac80211/rc80211_minstrel_debugfs.c
+@@ -0,0 +1,164 @@
++/*
++ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ * Based on minstrel.c:
++ *   Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
++ *   Sponsored by Indranet Technologies Ltd
++ *
++ * Based on sample.c:
++ *   Copyright (c) 2005 John Bicket
++ *   All rights reserved.
++ *
++ *   Redistribution and use in source and binary forms, with or without
++ *   modification, are permitted provided that the following conditions
++ *   are met:
++ *   1. Redistributions of source code must retain the above copyright
++ *      notice, this list of conditions and the following disclaimer,
++ *      without modification.
++ *   2. Redistributions in binary form must reproduce at minimum a disclaimer
++ *      similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
++ *      redistribution must be conditioned upon including a substantially
++ *      similar Disclaimer requirement for further binary redistribution.
++ *   3. Neither the names of the above-listed copyright holders nor the names
++ *      of any contributors may be used to endorse or promote products derived
++ *      from this software without specific prior written permission.
++ *
++ *   Alternatively, this software may be distributed under the terms of the
++ *   GNU General Public License ("GPL") version 2 as published by the Free
++ *   Software Foundation.
++ *
++ *   NO WARRANTY
++ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
++ *   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
++ *   LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
++ *   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
++ *   THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
++ *   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
++ *   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
++ *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
++ *   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
++ *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
++ *   THE POSSIBILITY OF SUCH DAMAGES.
++ */
++#include <linux/netdevice.h>
++#include <linux/types.h>
++#include <linux/skbuff.h>
++#include <linux/debugfs.h>
++#include <linux/ieee80211.h>
++#include <net/mac80211.h>
++#include "rc80211_minstrel.h"
++
++struct minstrel_stats_info {
++	struct minstrel_sta_info *mi;
++	char buf[4096];
++	size_t len;
++};
++
++static int
++minstrel_stats_open(struct inode *inode, struct file *file)
++{
++	struct minstrel_sta_info *mi = inode->i_private;
++	struct minstrel_stats_info *ms;
++	unsigned int i, tp, prob, eprob;
++	char *p;
++
++	ms = kmalloc(sizeof(*ms), GFP_KERNEL);
++	if (!ms)
++		return -ENOMEM;
++
++	file->private_data = ms;
++	p = ms->buf;
++	p += sprintf(p, "rate     throughput  ewma prob   this prob  "
++			"this succ/attempt   success    attempts\n");
++	for (i = 0; i < mi->n_rates; i++) {
++		struct minstrel_rate *mr = &mi->r[i];
++
++		*(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
++		*(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
++		*(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
++		p += sprintf(p, "%3u%s", mr->bitrate / 2,
++				(mr->bitrate & 1 ? ".5" : "  "));
++
++		tp = ((mr->cur_tp * 96) / 18000) >> 10;
++		prob = mr->cur_prob / 18;
++		eprob = mr->probability / 18;
++
++		p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
++				"%3u(%3u)   %8llu    %8llu\n",
++				tp / 10, tp % 10,
++				eprob / 10, eprob % 10,
++				prob / 10, prob % 10,
++				mr->last_success,
++				mr->last_attempts,
++				mr->succ_hist,
++				mr->att_hist);
++	}
++	p += sprintf(p, "\nTotal packet count::    ideal %d      "
++			"lookaround %d\n\n",
++			mi->packet_count - mi->sample_count,
++			mi->sample_count);
++	ms->len = p - ms->buf;
++
++	return 0;
++}
++
++static int
++minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *o)
++{
++	struct minstrel_stats_info *ms;
++	char *src;
++
++	ms = file->private_data;
++	src = ms->buf;
++
++	len = min(len, ms->len);
++	if (len <= *o)
++		return 0;
++
++	src += *o;
++	len -= *o;
++	*o += len;
++
++	if (copy_to_user(buf, src, len))
++		return -EFAULT;
++
++	return len;
++}
++
++static int
++minstrel_stats_release(struct inode *inode, struct file *file)
++{
++	struct minstrel_stats_info *ms = file->private_data;
++
++	kfree(ms);
++
++	return 0;
++}
++
++static struct file_operations minstrel_stat_fops = {
++	.owner = THIS_MODULE,
++	.open = minstrel_stats_open,
++	.read = minstrel_stats_read,
++	.release = minstrel_stats_release,
++};
++
++void
++minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
++{
++	struct minstrel_sta_info *mi = priv_sta;
++
++	mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
++			&minstrel_stat_fops);
++}
++
++void
++minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
++{
++	struct minstrel_sta_info *mi = priv_sta;
++
++	debugfs_remove(mi->dbg_stats);
++}
+--- a/net/mac80211/Kconfig
++++ b/net/mac80211/Kconfig
+@@ -22,6 +22,11 @@
+ 	  mac80211 that uses a PID controller to select the TX
+ 	  rate.
+ 
++config MAC80211_RC_MINSTREL
++	bool "Minstrel"
++	---help---
++	  This option enables the 'minstrel' TX rate control algorithm
++
+ choice
+ 	prompt "Default rate control algorithm"
+ 	default MAC80211_RC_DEFAULT_PID
+@@ -39,11 +44,19 @@
+ 	  default rate control algorithm. You should choose
+ 	  this unless you know what you are doing.
+ 
++config MAC80211_RC_DEFAULT_MINSTREL
++	bool "Minstrel"
++	depends on MAC80211_RC_MINSTREL
++	---help---
++	  Select Minstrel as the default rate control algorithm.
++
++
+ endchoice
+ 
+ config MAC80211_RC_DEFAULT
+ 	string
+ 	default "pid" if MAC80211_RC_DEFAULT_PID
++	default "minstrel" if MAC80211_RC_DEFAULT_MINSTREL
+ 	default ""
+ 
+ endmenu