1 files changed, 156 insertions, 98 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9801afb62545..3741c0a7978a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -214,29 +214,24 @@ struct ieee80211_bss_conf {
  * These flags are used with the @flags member of &ieee80211_tx_info.
  *
  * @IEEE80211_TX_CTL_REQ_TX_STATUS: request TX status callback for this frame.
- * @IEEE80211_TX_CTL_USE_RTS_CTS: use RTS-CTS before sending frame
- * @IEEE80211_TX_CTL_USE_CTS_PROTECT: use CTS protection for the frame (e.g.,
- *      for combined 802.11g / 802.11b networks)
+ * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
+ *      number to this frame, taking care of not overwriting the fragment
+ *      number and increasing the sequence number only when the
+ *      IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
+ *      assign sequence numbers to QoS-data frames but cannot do so correctly
+ *      for non-QoS-data and management frames because beacons need them from
+ *      that counter as well and mac80211 cannot guarantee proper sequencing.
+ *      If this flag is set, the driver should instruct the hardware to
+ *      assign a sequence number to the frame or assign one itself. Cf. IEEE
+ *      802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
+ *      beacons and always be clear for frames without a sequence number field.
  * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
- * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: TBD
  * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
  *      station
- * @IEEE80211_TX_CTL_REQUEUE: TBD
  * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
- * @IEEE80211_TX_CTL_SHORT_PREAMBLE: TBD
- * @IEEE80211_TX_CTL_LONG_RETRY_LIMIT: this frame should be send using the
- *      through set_retry_limit configured long retry value
  * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
  * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
- * @IEEE80211_TX_CTL_OFDM_HT: this frame can be sent in HT OFDM rates. number
- *      of streams when this flag is on can be extracted from antenna_sel_tx,
- *      so if 1 antenna is marked use SISO, 2 antennas marked use MIMO, n
- *      antennas marked use MIMO_n.
- * @IEEE80211_TX_CTL_GREEN_FIELD: use green field protection for this frame
- * @IEEE80211_TX_CTL_40_MHZ_WIDTH: send this frame using 40 Mhz channel width
- * @IEEE80211_TX_CTL_DUP_DATA: duplicate data frame on both 20 Mhz channels
- * @IEEE80211_TX_CTL_SHORT_GI: send this frame using short guard interval
- * @IEEE80211_TX_CTL_INJECTED: TBD
+ * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
  * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
  *      because the destination STA was in powersave mode.
  * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
@@ -244,62 +239,70 @@ struct ieee80211_bss_conf {
  *      is for the whole aggregation.
  * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
  *      so consider using block ack request (BAR).
- * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
- *      number to this frame, taking care of not overwriting the fragment
- *      number and increasing the sequence number only when the
- *      IEEE80211_TX_CTL_FIRST_FRAGMENT flags is set. mac80211 will properly
- *      assign sequence numbers to QoS-data frames but cannot do so correctly
- *      for non-QoS-data and management frames because beacons need them from
- *      that counter as well and mac80211 cannot guarantee proper sequencing.
- *      If this flag is set, the driver should instruct the hardware to
- *      assign a sequence number to the frame or assign one itself. Cf. IEEE
- *      802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
- *      beacons always be clear for frames without a sequence number field.
+ * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
+ *      set by rate control algorithms to indicate probe rate, will
+ *      be cleared for fragmented frames (except on the last fragment)
+ * @IEEE80211_TX_CTL_REQUEUE: REMOVE THIS
  */
 enum mac80211_tx_control_flags {
         IEEE80211_TX_CTL_REQ_TX_STATUS          = BIT(0),
-        IEEE80211_TX_CTL_USE_RTS_CTS            = BIT(2),
-        IEEE80211_TX_CTL_USE_CTS_PROTECT        = BIT(3),
-        IEEE80211_TX_CTL_NO_ACK                 = BIT(4),
-        IEEE80211_TX_CTL_RATE_CTRL_PROBE        = BIT(5),
-        IEEE80211_TX_CTL_CLEAR_PS_FILT          = BIT(6),
-        IEEE80211_TX_CTL_REQUEUE                = BIT(7),
-        IEEE80211_TX_CTL_FIRST_FRAGMENT         = BIT(8),
-        IEEE80211_TX_CTL_SHORT_PREAMBLE         = BIT(9),
-        IEEE80211_TX_CTL_LONG_RETRY_LIMIT       = BIT(10),
-        IEEE80211_TX_CTL_SEND_AFTER_DTIM        = BIT(12),
-        IEEE80211_TX_CTL_AMPDU                  = BIT(13),
-        IEEE80211_TX_CTL_OFDM_HT                = BIT(14),
-        IEEE80211_TX_CTL_GREEN_FIELD            = BIT(15),
-        IEEE80211_TX_CTL_40_MHZ_WIDTH           = BIT(16),
-        IEEE80211_TX_CTL_DUP_DATA               = BIT(17),
-        IEEE80211_TX_CTL_SHORT_GI               = BIT(18),
-        IEEE80211_TX_CTL_INJECTED               = BIT(19),
-        IEEE80211_TX_STAT_TX_FILTERED           = BIT(20),
-        IEEE80211_TX_STAT_ACK                   = BIT(21),
-        IEEE80211_TX_STAT_AMPDU                 = BIT(22),
-        IEEE80211_TX_STAT_AMPDU_NO_BACK         = BIT(23),
-        IEEE80211_TX_CTL_ASSIGN_SEQ             = BIT(24),
+        IEEE80211_TX_CTL_ASSIGN_SEQ             = BIT(1),
+        IEEE80211_TX_CTL_NO_ACK                 = BIT(2),
+        IEEE80211_TX_CTL_CLEAR_PS_FILT          = BIT(3),
+        IEEE80211_TX_CTL_FIRST_FRAGMENT         = BIT(4),
+        IEEE80211_TX_CTL_SEND_AFTER_DTIM        = BIT(5),
+        IEEE80211_TX_CTL_AMPDU                  = BIT(6),
+        IEEE80211_TX_CTL_INJECTED               = BIT(7),
+        IEEE80211_TX_STAT_TX_FILTERED           = BIT(8),
+        IEEE80211_TX_STAT_ACK                   = BIT(9),
+        IEEE80211_TX_STAT_AMPDU                 = BIT(10),
+        IEEE80211_TX_STAT_AMPDU_NO_BACK         = BIT(11),
+        IEEE80211_TX_CTL_RATE_CTRL_PROBE        = BIT(12),
+
+        /* XXX: remove this */
+        IEEE80211_TX_CTL_REQUEUE                = BIT(13),
 };
 
+enum mac80211_rate_control_flags {
+        IEEE80211_TX_RC_USE_RTS_CTS             = BIT(0),
+        IEEE80211_TX_RC_USE_CTS_PROTECT         = BIT(1),
+        IEEE80211_TX_RC_USE_SHORT_PREAMBLE      = BIT(2),
+
+        /* rate index is an MCS rate number instead of an index */
+        IEEE80211_TX_RC_MCS                     = BIT(3),
+        IEEE80211_TX_RC_GREEN_FIELD             = BIT(4),
+        IEEE80211_TX_RC_40_MHZ_WIDTH            = BIT(5),
+        IEEE80211_TX_RC_DUP_DATA                = BIT(6),
+        IEEE80211_TX_RC_SHORT_GI                = BIT(7),
+};
+
+
+/* there are 40 bytes if you don't need the rateset to be kept */
+#define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
 
-#define IEEE80211_TX_INFO_DRIVER_DATA_SIZE \
-        (sizeof(((struct sk_buff *)0)->cb) - 8)
-#define IEEE80211_TX_INFO_DRIVER_DATA_PTRS \
-        (IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *))
+/* if you do need the rateset, then you have less space */
+#define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
 
-/* maximum number of alternate rate retry stages */
-#define IEEE80211_TX_MAX_ALTRATE        3
+/* maximum number of rate stages */
+#define IEEE80211_TX_MAX_RATES  5
 
 /**
- * struct ieee80211_tx_altrate - alternate rate selection/status
+ * struct ieee80211_tx_rate - rate selection/status
  *
- * @rate_idx: rate index to attempt to send with
+ * @idx: rate index to attempt to send with
+ * @flags: rate control flags (&enum mac80211_rate_control_flags)
  * @limit: number of retries before fallback
+ *
+ * A value of -1 for @idx indicates an invalid rate and, if used
+ * in an array of retry rates, that no more rates should be tried.
+ *
+ * When used for transmit status reporting, the driver should
+ * always report the rate along with the flags it used.
  */
-struct ieee80211_tx_altrate {
-        s8 rate_idx;
-        u8 limit;
+struct ieee80211_tx_rate {
+        s8 idx;
+        u8 count;
+        u8 flags;
 };
 
 /**
@@ -314,15 +317,12 @@ struct ieee80211_tx_altrate {
  * it may be NULL.
  *
  * @flags: transmit info flags, defined above
- * @band: TBD
- * @tx_rate_idx: TBD
+ * @band: the band to transmit on (use for checking for races)
  * @antenna_sel_tx: antenna to use, 0 for automatic diversity
  * @control: union for control data
  * @status: union for status data
  * @driver_data: array of driver_data pointers
  * @retry_count: number of retries
- * @excessive_retries: set to 1 if the frame was retried many times
- *      but not acknowledged
  * @ampdu_ack_len: number of aggregated frames.
  *      relevant only if IEEE80211_TX_STATUS_AMPDU was set.
  * @ampdu_ack_map: block ack bit map for the aggregation.
@@ -333,31 +333,43 @@ struct ieee80211_tx_info {
         /* common information */
         u32 flags;
         u8 band;
-        s8 tx_rate_idx;
+
         u8 antenna_sel_tx;
 
-        /* 1 byte hole */
+        /* 2 byte hole */
 
         union {
                 struct {
+                        union {
+                                /* rate control */
+                                struct {
+                                        struct ieee80211_tx_rate rates[
+                                                IEEE80211_TX_MAX_RATES];
+                                        s8 rts_cts_rate_idx;
+                                };
+                                /* only needed before rate control */
+                                unsigned long jiffies;
+                        };
                         /* NB: vif can be NULL for injected frames */
                         struct ieee80211_vif *vif;
                         struct ieee80211_key_conf *hw_key;
                         struct ieee80211_sta *sta;
-                        unsigned long jiffies;
-                        s8 rts_cts_rate_idx;
-                        u8 retry_limit;
-                        struct ieee80211_tx_altrate retries[IEEE80211_TX_MAX_ALTRATE];
                 } control;
                 struct {
+                        struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
+                        u8 ampdu_ack_len;
                         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;
+                        /* 8 bytes free */
                 } status;
-                void *driver_data[IEEE80211_TX_INFO_DRIVER_DATA_PTRS];
+                struct {
+                        struct ieee80211_tx_rate driver_rates[
+                                IEEE80211_TX_MAX_RATES];
+                        void *rate_driver_data[
+                                IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
+                };
+                void *driver_data[
+                        IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
         };
 };
 
@@ -366,6 +378,41 @@ static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
         return (struct ieee80211_tx_info *)skb->cb;
 }
 
+/**
+ * ieee80211_tx_info_clear_status - clear TX status
+ *
+ * @info: The &struct ieee80211_tx_info to be cleared.
+ *
+ * When the driver passes an skb back to mac80211, it must report
+ * a number of things in TX status. This function clears everything
+ * in the TX status but the rate control information (it does clear
+ * the count since you need to fill that in anyway).
+ *
+ * NOTE: You can only use this function if you do NOT use
+ *       info->driver_data! Use info->rate_driver_data
+ *       instead if you need only the less space that allows.
+ */
+static inline void
+ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
+{
+        int i;
+
+        BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
+                     offsetof(struct ieee80211_tx_info, control.rates));
+        BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
+                     offsetof(struct ieee80211_tx_info, driver_rates));
+        BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
+        /* clear the rate counts */
+        for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
+                info->status.rates[i].count = 0;
+
+        BUILD_BUG_ON(
+            offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
+        memset(&info->status.ampdu_ack_len, 0,
+               sizeof(struct ieee80211_tx_info) -
+               offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
+}
+
 
 /**
  * enum mac80211_rx_flags - receive flags
@@ -869,8 +916,8 @@ enum ieee80211_hw_flags {
  * @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
+ * @max_rates: maximum number of alternate rate retry stages
+ * @max_rate_tries: maximum number of tries for each stage
  */
 struct ieee80211_hw {
         struct ieee80211_conf conf;
@@ -887,8 +934,8 @@ struct ieee80211_hw {
         u16 ampdu_queues;
         u16 max_listen_interval;
         s8 max_signal;
-        u8 max_altrates;
-        u8 max_altrate_tries;
+        u8 max_rates;
+        u8 max_rate_tries;
 };
 
 /**
@@ -927,9 +974,9 @@ static inline struct ieee80211_rate *
 ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
                       const struct ieee80211_tx_info *c)
 {
-        if (WARN_ON(c->tx_rate_idx < 0))
+        if (WARN_ON(c->control.rates[0].idx < 0))
                 return NULL;
-        return &hw->wiphy->bands[c->band]->bitrates[c->tx_rate_idx];
+        return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
 }
 
 static inline struct ieee80211_rate *
@@ -945,9 +992,9 @@ static inline struct ieee80211_rate *
 ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
                              const struct ieee80211_tx_info *c, int idx)
 {
-        if (c->control.retries[idx].rate_idx < 0)
+        if (c->control.rates[idx + 1].idx < 0)
                 return NULL;
-        return &hw->wiphy->bands[c->band]->bitrates[c->control.retries[idx].rate_idx];
+        return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
 }
 
 /**
@@ -1840,17 +1887,30 @@ struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
 
 
 /* Rate control API */
+
 /**
- * struct rate_selection - rate information for/from rate control algorithms
- *
- * @rate_idx: selected transmission rate index
- * @nonerp_idx: Non-ERP rate to use instead if ERP cannot be used
- * @probe_idx: rate for probing (or -1)
- * @max_rate_idx: maximum rate index that can be used, this is
- *      input to the algorithm and will be enforced
- */
-struct rate_selection {
-        s8 rate_idx, nonerp_idx, probe_idx, max_rate_idx;
+ * struct ieee80211_tx_rate_control - rate control information for/from RC algo
+ *
+ * @hw: The hardware the algorithm is invoked for.
+ * @sband: The band this frame is being transmitted on.
+ * @bss_conf: the current BSS configuration
+ * @reported_rate: The rate control algorithm can fill this in to indicate
+ *      which rate should be reported to userspace as the current rate and
+ *      used for rate calculations in the mesh network.
+ * @rts: whether RTS will be used for this frame because it is longer than the
+ *      RTS threshold
+ * @short_preamble: whether mac80211 will request short-preamble transmission
+ *      if the selected rate supports it
+ * @max_rate_idx: user-requested maximum rate (not MCS for now)
+ */
+struct ieee80211_tx_rate_control {
+        struct ieee80211_hw *hw;
+        struct ieee80211_supported_band *sband;
+        struct ieee80211_bss_conf *bss_conf;
+        struct sk_buff *skb;
+        struct ieee80211_tx_rate reported_rate;
+        bool rts, short_preamble;
+        u8 max_rate_idx;
 };
 
 struct rate_control_ops {
@@ -1869,10 +1929,8 @@ struct rate_control_ops {
         void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
                           struct ieee80211_sta *sta, void *priv_sta,
                           struct sk_buff *skb);
-        void (*get_rate)(void *priv, struct ieee80211_supported_band *sband,
-                         struct ieee80211_sta *sta, void *priv_sta,
-                         struct sk_buff *skb,
-                         struct rate_selection *sel);
+        void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
+                         struct ieee80211_tx_rate_control *txrc);
 
         void (*add_sta_debugfs)(void *priv, void *priv_sta,
                                 struct dentry *dir);