ath9k: Use bitfields for buffer type

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 83 insertions, 79 deletions

diff --git a/drivers/net/wireless/ath9k/core.h b/drivers/net/wireless/ath9k/core.h
index 07c958802b79..9e16c6c28a39 100644
--- a/drivers/net/wireless/ath9k/core.h
+++ b/drivers/net/wireless/ath9k/core.h
@@ -177,11 +177,6 @@ void ath_update_chainmask(struct ath_softc *sc, int is_ht);
 /* Descriptor Management */
 /*************************/
 
-/* Number of descriptors per buffer. The only case where we see skbuff
-chains is due to FF aggregation in the driver. */
-#define ATH_TXDESC          1
-/* if there's more fragment for this MSDU */
-#define ATH_BF_MORE_MPDU    1
 #define ATH_TXBUF_RESET(_bf) do {                               \
                 (_bf)->bf_status = 0;                           \
                 (_bf)->bf_lastbf = NULL;                        \
@@ -191,28 +186,29 @@ chains is due to FF aggregation in the driver. */
                             sizeof(struct ath_buf_state));      \
         } while (0)
 
+enum buffer_type {
+        BUF_DATA                = BIT(0),
+        BUF_AGGR                = BIT(1),
+        BUF_AMPDU               = BIT(2),
+        BUF_HT                  = BIT(3),
+        BUF_RETRY               = BIT(4),
+        BUF_XRETRY              = BIT(5),
+        BUF_SHORT_PREAMBLE      = BIT(6),
+        BUF_BAR                 = BIT(7),
+        BUF_PSPOLL              = BIT(8),
+        BUF_AGGR_BURST          = BIT(9),
+        BUF_CALC_AIRTIME        = BIT(10),
+};
+
 struct ath_buf_state {
-        int bfs_nframes;        /* # frames in aggregate */
-        u16 bfs_al;             /* length of aggregate */
-        u16 bfs_frmlen;         /* length of frame */
-        int bfs_seqno;          /* sequence number */
-        int bfs_tidno;          /* tid of this frame */
-        int bfs_retries;        /* current retries */
+        int bfs_nframes;                        /* # frames in aggregate */
+        u16 bfs_al;                             /* length of aggregate */
+        u16 bfs_frmlen;                         /* length of frame */
+        int bfs_seqno;                          /* sequence number */
+        int bfs_tidno;                          /* tid of this frame */
+        int bfs_retries;                        /* current retries */
         struct ath_rc_series bfs_rcs[4];        /* rate series */
-        u8 bfs_isdata:1;        /* is a data frame/aggregate */
-        u8 bfs_isaggr:1;        /* is an aggregate */
-        u8 bfs_isampdu:1;       /* is an a-mpdu, aggregate or not */
-        u8 bfs_ht:1;            /* is an HT frame */
-        u8 bfs_isretried:1;     /* is retried */
-        u8 bfs_isxretried:1;    /* is excessive retried */
-        u8 bfs_shpreamble:1;    /* is short preamble */
-        u8 bfs_isbar:1;         /* is a BAR */
-        u8 bfs_ispspoll:1;      /* is a PS-Poll */
-        u8 bfs_aggrburst:1;     /* is a aggr burst */
-        u8 bfs_calcairtime:1;   /* requests airtime be calculated
-                                when set for tx frame */
-        int bfs_rifsburst_elem; /* RIFS burst/bar */
-        int bfs_nrifsubframes;  /* # of elements in burst */
+        u32 bf_type;                            /* BUF_* (enum buffer_type) */
         /* key type use to encrypt this frame */
         enum ath9k_key_type bfs_keytype;
 };
@@ -224,26 +220,22 @@ struct ath_buf_state {
 #define bf_seqno                bf_state.bfs_seqno
 #define bf_tidno                bf_state.bfs_tidno
 #define bf_rcs                  bf_state.bfs_rcs
-#define bf_isdata               bf_state.bfs_isdata
-#define bf_isaggr               bf_state.bfs_isaggr
-#define bf_isampdu              bf_state.bfs_isampdu
-#define bf_ht                   bf_state.bfs_ht
-#define bf_isretried            bf_state.bfs_isretried
-#define bf_isxretried           bf_state.bfs_isxretried
-#define bf_shpreamble           bf_state.bfs_shpreamble
-#define bf_rifsburst_elem       bf_state.bfs_rifsburst_elem
-#define bf_nrifsubframes        bf_state.bfs_nrifsubframes
 #define bf_keytype              bf_state.bfs_keytype
-#define bf_isbar                bf_state.bfs_isbar
-#define bf_ispspoll             bf_state.bfs_ispspoll
-#define bf_aggrburst            bf_state.bfs_aggrburst
-#define bf_calcairtime          bf_state.bfs_calcairtime
+#define bf_isdata(bf)           (bf->bf_state.bf_type & BUF_DATA)
+#define bf_isaggr(bf)           (bf->bf_state.bf_type & BUF_AGGR)
+#define bf_isampdu(bf)          (bf->bf_state.bf_type & BUF_AMPDU)
+#define bf_isht(bf)             (bf->bf_state.bf_type & BUF_HT)
+#define bf_isretried(bf)        (bf->bf_state.bf_type & BUF_RETRY)
+#define bf_isxretried(bf)       (bf->bf_state.bf_type & BUF_XRETRY)
+#define bf_isshpreamble(bf)     (bf->bf_state.bf_type & BUF_SHORT_PREAMBLE)
+#define bf_isbar(bf)            (bf->bf_state.bf_type & BUF_BAR)
+#define bf_ispspoll(bf)         (bf->bf_state.bf_type & BUF_PSPOLL)
+#define bf_isaggrburst(bf)      (bf->bf_state.bf_type & BUF_AGGR_BURST)
 
 /*
  * Abstraction of a contiguous buffer to transmit/receive.  There is only
  * a single hw descriptor encapsulated here.
  */
-
 struct ath_buf {
         struct list_head list;
         struct list_head *last;
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 93064cc4cba8..47cf9f3555ae 100644
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -518,7 +518,7 @@ static void ath_tx_complete_buf(struct ath_softc *sc,
         if (!txok) {
                 tx_status.flags |= ATH_TX_ERROR;
 
-                if (bf->bf_isxretried)
+                if (bf_isxretried(bf))
                         tx_status.flags |= ATH_TX_XRETRY;
         }
         /* Unmap this frame */
@@ -629,7 +629,7 @@ static int ath_tx_num_badfrms(struct ath_softc *sc,
         if (isnodegone || ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED)
                 return 0;
 
-        isaggr = bf->bf_isaggr;
+        isaggr = bf_isaggr(bf);
         if (isaggr) {
                 seq_st = ATH_DS_BA_SEQ(ds);
                 memcpy(ba, ATH_DS_BA_BITMAP(ds), WME_BA_BMP_SIZE >> 3);
@@ -651,7 +651,7 @@ static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
         struct sk_buff *skb;
         struct ieee80211_hdr *hdr;
 
-        bf->bf_isretried = 1;
+        bf->bf_state.bf_type |= BUF_RETRY;
         bf->bf_retries++;
 
         skb = bf->bf_mpdu;
@@ -698,7 +698,7 @@ static u32 ath_pkt_duration(struct ath_softc *sc,
         u8 rc;
         int streams, pktlen;
 
-        pktlen = bf->bf_isaggr ? bf->bf_al : bf->bf_frmlen;
+        pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen;
         rc = rt->info[rix].rateCode;
 
         /*
@@ -781,7 +781,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
          * let rate series flags determine which rates will actually
          * use RTS.
          */
-        if ((ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) && bf->bf_isdata) {
+        if ((ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) && bf_isdata(bf)) {
                 BUG_ON(!an);
                 /*
                  * 802.11g protection not needed, use our default behavior
@@ -793,7 +793,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                  * and the second aggregate should have any protection at all.
                  */
                 if (an->an_smmode == ATH_SM_PWRSAV_DYNAMIC) {
-                        if (!bf->bf_aggrburst) {
+                        if (!bf_isaggrburst(bf)) {
                                 flags = ATH9K_TXDESC_RTSENA;
                                 dynamic_mimops = 1;
                         } else {
@@ -806,7 +806,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
          * Set protection if aggregate protection on
          */
         if (sc->sc_config.ath_aggr_prot &&
-            (!bf->bf_isaggr || (bf->bf_isaggr && bf->bf_al < 8192))) {
+            (!bf_isaggr(bf) || (bf_isaggr(bf) && bf->bf_al < 8192))) {
                 flags = ATH9K_TXDESC_RTSENA;
                 cix = rt->info[sc->sc_protrix].controlRate;
                 rtsctsena = 1;
@@ -815,7 +815,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
         /*
          *  For AR5416 - RTS cannot be followed by a frame larger than 8K.
          */
-        if (bf->bf_isaggr && (bf->bf_al > aggr_limit_with_rts)) {
+        if (bf_isaggr(bf) && (bf->bf_al > aggr_limit_with_rts)) {
                 /*
                  * Ensure that in the case of SM Dynamic power save
                  * while we are bursting the second aggregate the
@@ -832,7 +832,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
         /* NB: cix is set above where RTS/CTS is enabled */
         BUG_ON(cix == 0xff);
         ctsrate = rt->info[cix].rateCode |
-                (bf->bf_shpreamble ? rt->info[cix].shortPreamble : 0);
+                (bf_isshpreamble(bf) ? rt->info[cix].shortPreamble : 0);
 
         /*
          * Setup HAL rate series
@@ -846,7 +846,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                 rix = bf->bf_rcs[i].rix;
 
                 series[i].Rate = rt->info[rix].rateCode |
-                        (bf->bf_shpreamble ? rt->info[rix].shortPreamble : 0);
+                        (bf_isshpreamble(bf) ? rt->info[rix].shortPreamble : 0);
 
                 series[i].Tries = bf->bf_rcs[i].tries;
 
@@ -862,7 +862,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                         sc, rix, bf,
                         (bf->bf_rcs[i].flags & ATH_RC_CW40_FLAG) != 0,
                         (bf->bf_rcs[i].flags & ATH_RC_SGI_FLAG),
-                        bf->bf_shpreamble);
+                        bf_isshpreamble(bf));
 
                 if ((an->an_smmode == ATH_SM_PWRSAV_STATIC) &&
                     (bf->bf_rcs[i].flags & ATH_RC_DS_FLAG) == 0) {
@@ -875,7 +875,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                          */
                         series[i].ChSel = sc->sc_tx_chainmask;
                 } else {
-                        if (bf->bf_ht)
+                        if (bf_isht(bf))
                                 series[i].ChSel =
                                         ath_chainmask_sel_logic(sc, an);
                         else
@@ -908,7 +908,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                  *     use the precalculated ACK durations.
                  */
                 if (flags & ATH9K_TXDESC_RTSENA) {    /* SIFS + CTS */
-                        ctsduration += bf->bf_shpreamble ?
+                        ctsduration += bf_isshpreamble(bf) ?
                                 rt->info[cix].spAckDuration :
                                 rt->info[cix].lpAckDuration;
                 }
@@ -916,7 +916,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                 ctsduration += series[0].PktDuration;
 
                 if ((bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) { /* SIFS + ACK */
-                        ctsduration += bf->bf_shpreamble ?
+                        ctsduration += bf_isshpreamble(bf) ?
                                 rt->info[rix].spAckDuration :
                                 rt->info[rix].lpAckDuration;
                 }
@@ -932,10 +932,10 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
          * set dur_update_en for l-sig computation except for PS-Poll frames
          */
         ath9k_hw_set11n_ratescenario(ah, ds, lastds,
-                                    !bf->bf_ispspoll,
-                                    ctsrate,
-                                    ctsduration,
-                                    series, 4, flags);
+                                     !bf_ispspoll(bf),
+                                     ctsrate,
+                                     ctsduration,
+                                     series, 4, flags);
         if (sc->sc_config.ath_aggr_prot && flags)
                 ath9k_hw_set11n_burstduration(ah, ds, 8192);
 }
@@ -958,7 +958,7 @@ static int ath_tx_send_normal(struct ath_softc *sc,
         BUG_ON(list_empty(bf_head));
 
         bf = list_first_entry(bf_head, struct ath_buf, list);
-        bf->bf_isampdu = 0; /* regular HT frame */
+        bf->bf_state.bf_type &= ~BUF_AMPDU; /* regular HT frame */
 
         skb = (struct sk_buff *)bf->bf_mpdu;
         tx_info = IEEE80211_SKB_CB(skb);
@@ -998,7 +998,7 @@ static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
 
         while (!list_empty(&tid->buf_q)) {
                 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
-                ASSERT(!bf->bf_isretried);
+                ASSERT(!bf_isretried(bf));
                 list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
                 ath_tx_send_normal(sc, txq, tid, &bf_head);
         }
@@ -1025,7 +1025,7 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
         int isaggr, txfail, txpending, sendbar = 0, needreset = 0;
         int isnodegone = (an->an_flags & ATH_NODE_CLEAN);
 
-        isaggr = bf->bf_isaggr;
+        isaggr = bf_isaggr(bf);
         if (isaggr) {
                 if (txok) {
                         if (ATH_DS_TX_BA(ds)) {
@@ -1075,7 +1075,7 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
                                         ath_tx_set_retry(sc, bf);
                                         txpending = 1;
                                 } else {
-                                        bf->bf_isxretried = 1;
+                                        bf->bf_state.bf_type |= BUF_XRETRY;
                                         txfail = 1;
                                         sendbar = 1;
                                 }
@@ -1331,7 +1331,7 @@ static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 
                 txq->axq_depth--;
 
-                if (bf->bf_isaggr)
+                if (bf_isaggr(bf))
                         txq->axq_aggr_depth--;
 
                 txok = (ds->ds_txstat.ts_status == 0);
@@ -1345,14 +1345,14 @@ static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                         spin_unlock_bh(&sc->sc_txbuflock);
                 }
 
-                if (!bf->bf_isampdu) {
+                if (!bf_isampdu(bf)) {
                         /*
                          * This frame is sent out as a single frame.
                          * Use hardware retry status for this frame.
                          */
                         bf->bf_retries = ds->ds_txstat.ts_longretry;
                         if (ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY)
-                                bf->bf_isxretried = 1;
+                                bf->bf_state.bf_type |= BUF_XRETRY;
                         nbad = 0;
                 } else {
                         nbad = ath_tx_num_badfrms(sc, bf, txok);
@@ -1368,7 +1368,7 @@ static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                         if (ds->ds_txstat.ts_status == 0)
                                 nacked++;
 
-                        if (bf->bf_isdata) {
+                        if (bf_isdata(bf)) {
                                 if (isrifs)
                                         tmp_ds = bf->bf_rifslast->bf_desc;
                                 else
@@ -1384,7 +1384,7 @@ static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                 /*
                  * Complete this transmit unit
                  */
-                if (bf->bf_isampdu)
+                if (bf_isampdu(bf))
                         ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, txok);
                 else
                         ath_tx_complete_buf(sc, bf, &bf_head, txok, 0);
@@ -1481,7 +1481,7 @@ static void ath_tx_addto_baw(struct ath_softc *sc,
 {
         int index, cindex;
 
-        if (bf->bf_isretried)
+        if (bf_isretried(bf))
                 return;
 
         index  = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno);
@@ -1516,7 +1516,7 @@ static int ath_tx_send_ampdu(struct ath_softc *sc,
         BUG_ON(list_empty(bf_head));
 
         bf = list_first_entry(bf_head, struct ath_buf, list);
-        bf->bf_isampdu = 1;
+        bf->bf_state.bf_type |= BUF_AMPDU;
         bf->bf_seqno = txctl->seqno; /* save seqno and tidno in buffer */
         bf->bf_tidno = txctl->tidno;
 
@@ -1860,7 +1860,7 @@ static void ath_tx_sched_aggr(struct ath_softc *sc,
                 if (bf->bf_nframes == 1) {
                         ASSERT(bf->bf_lastfrm == bf_last);
 
-                        bf->bf_isaggr = 0;
+                        bf->bf_state.bf_type &= ~BUF_AGGR;
                         /*
                          * clear aggr bits for every descriptor
                          * XXX TODO: is there a way to optimize it?
@@ -1877,7 +1877,7 @@ static void ath_tx_sched_aggr(struct ath_softc *sc,
                 /*
                  * setup first desc with rate and aggr info
                  */
-                bf->bf_isaggr  = 1;
+                bf->bf_state.bf_type |= BUF_AGGR;
                 ath_buf_set_rate(sc, bf);
                 ath9k_hw_set11n_aggr_first(sc->sc_ah, bf->bf_desc, bf->bf_al);
 
@@ -1925,7 +1925,7 @@ static void ath_tid_drain(struct ath_softc *sc,
                 list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
 
                 /* update baw for software retried frame */
-                if (bf->bf_isretried)
+                if (bf_isretried(bf))
                         ath_tx_update_baw(sc, tid, bf->bf_seqno);
 
                 /*
@@ -2014,11 +2014,21 @@ static int ath_tx_start_dma(struct ath_softc *sc,
         /* set up this buffer */
         ATH_TXBUF_RESET(bf);
         bf->bf_frmlen = txctl->frmlen;
-        bf->bf_isdata = ieee80211_is_data(fc);
-        bf->bf_isbar = ieee80211_is_back_req(fc);
-        bf->bf_ispspoll = ieee80211_is_pspoll(fc);
+
+        ieee80211_is_data(fc) ?
+                (bf->bf_state.bf_type |= BUF_DATA) :
+                (bf->bf_state.bf_type &= ~BUF_DATA);
+        ieee80211_is_back_req(fc) ?
+                (bf->bf_state.bf_type |= BUF_BAR) :
+                (bf->bf_state.bf_type &= ~BUF_BAR);
+        ieee80211_is_pspoll(fc) ?
+                (bf->bf_state.bf_type |= BUF_PSPOLL) :
+                (bf->bf_state.bf_type &= ~BUF_PSPOLL);
+        (sc->sc_flags & ATH_PREAMBLE_SHORT) ?
+                (bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE) :
+                (bf->bf_state.bf_type &= ~BUF_SHORT_PREAMBLE);
+
         bf->bf_flags = txctl->flags;
-        bf->bf_shpreamble = sc->sc_flags & ATH_PREAMBLE_SHORT;
         bf->bf_keytype = txctl->keytype;
         tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
         rcs = tx_info_priv->rcs;
@@ -2060,7 +2070,9 @@ static int ath_tx_start_dma(struct ath_softc *sc,
                             ds);                /* first descriptor */
 
         bf->bf_lastfrm = bf;
-        bf->bf_ht = txctl->ht;
+        (txctl->ht) ?
+                (bf->bf_state.bf_type |= BUF_HT) :
+                (bf->bf_state.bf_type &= ~BUF_HT);
 
         spin_lock_bh(&txq->axq_lock);
 
@@ -2162,7 +2174,7 @@ int ath_tx_init(struct ath_softc *sc, int nbufs)
 
                 /* Setup tx descriptors */
                 error = ath_descdma_setup(sc, &sc->sc_txdma, &sc->sc_txbuf,
-                        "tx", nbufs * ATH_FRAG_PER_MSDU, ATH_TXDESC);
+                        "tx", nbufs * ATH_FRAG_PER_MSDU, 1);
                 if (error != 0) {
                         DPRINTF(sc, ATH_DBG_FATAL,
                                 "%s: failed to allocate tx descriptors: %d\n",
@@ -2486,7 +2498,7 @@ void ath_tx_draintxq(struct ath_softc *sc,
 
                 spin_unlock_bh(&txq->axq_lock);
 
-                if (bf->bf_isampdu)
+                if (bf_isampdu(bf))
                         ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, 0);
                 else
                         ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
@@ -2647,7 +2659,7 @@ void ath_tx_aggr_teardown(struct ath_softc *sc,
         spin_lock_bh(&txq->axq_lock);
         while (!list_empty(&txtid->buf_q)) {
                 bf = list_first_entry(&txtid->buf_q, struct ath_buf, list);
-                if (!bf->bf_isretried) {
+                if (!bf_isretried(bf)) {
                         /*
                          * NB: it's based on the assumption that
                          * software retried frame will always stay