package/madwifi/patches/300-napi_polling.patch

   1 Index: madwifi-ng-r2568-20070710/ath/if_ath.c
   2 ===================================================================
   3 --- madwifi-ng-r2568-20070710.orig/ath/if_ath.c 2007-07-23 01:48:44.466514171 +0200
   4 +++ madwifi-ng-r2568-20070710/ath/if_ath.c      2007-07-23 01:48:45.030546315 +0200
   5 @@ -170,7 +170,7 @@
   6         int, u_int64_t);
   7  static void ath_setdefantenna(struct ath_softc *, u_int);
   8  static struct ath_txq *ath_txq_setup(struct ath_softc *, int, int);
   9 -static void ath_rx_tasklet(TQUEUE_ARG);
  10 +static int ath_rx_poll(struct net_device *dev, int *budget);
  11  static int ath_hardstart(struct sk_buff *, struct net_device *);
  12  static int ath_mgtstart(struct ieee80211com *, struct sk_buff *);
  13  #ifdef ATH_SUPERG_COMP
  14 @@ -444,7 +444,6 @@
  15         ATH_TXBUF_LOCK_INIT(sc);
  16         ATH_RXBUF_LOCK_INIT(sc);
  17
  18 -       ATH_INIT_TQUEUE(&sc->sc_rxtq,     ath_rx_tasklet,       dev);
  19         ATH_INIT_TQUEUE(&sc->sc_txtq,     ath_tx_tasklet,       dev);
  20         ATH_INIT_TQUEUE(&sc->sc_bmisstq,  ath_bmiss_tasklet,    dev);
  21         ATH_INIT_TQUEUE(&sc->sc_bstucktq, ath_bstuck_tasklet,   dev);
  22 @@ -691,6 +690,8 @@
  23         dev->set_mac_address = ath_set_mac_address;
  24         dev->change_mtu = ath_change_mtu;
  25         dev->tx_queue_len = ATH_TXBUF - 1;              /* 1 for mgmt frame */
  26 +       dev->poll = ath_rx_poll;
  27 +       dev->weight = 64;
  28  #ifdef USE_HEADERLEN_RESV
  29         dev->hard_header_len += sizeof(struct ieee80211_qosframe) +
  30                                 sizeof(struct llc) +
  31 @@ -1667,6 +1668,7 @@
  32          */
  33         ath_hal_getisr(ah, &status);            /* NB: clears ISR too */
  34         DPRINTF(sc, ATH_DEBUG_INTR, "%s: status 0x%x\n", __func__, status);
  35 +       sc->sc_isr = status;
  36         status &= sc->sc_imask;                 /* discard unasked for bits */
  37         if (status & HAL_INT_FATAL) {
  38                 sc->sc_stats.ast_hardware++;
  39 @@ -1702,7 +1704,14 @@
  40                 if (status & HAL_INT_RX) {
  41                         sc->sc_tsf = ath_hal_gettsf64(ah);
  42                         ath_uapsd_processtriggers(sc);
  43 -                       ATH_SCHEDULE_TQUEUE(&sc->sc_rxtq, &needmark);
  44 +                       sc->sc_isr &= ~HAL_INT_RX;
  45 +                       if (netif_rx_schedule_prep(dev)) {
  46 +#ifndef ATH_PRECISE_TSF
  47 +                               sc->sc_imask &= ~HAL_INT_RX;
  48 +                               ath_hal_intrset(ah, sc->sc_imask);
  49 +#endif
  50 +                               __netif_rx_schedule(dev);
  51 +                       }
  52                 }
  53                 if (status & HAL_INT_TX) {
  54  #ifdef ATH_SUPERG_DYNTURBO
  55 @@ -1728,6 +1737,11 @@
  56                                 }
  57                         }
  58  #endif
  59 +                       /* disable transmit interrupt */
  60 +                       sc->sc_isr &= ~HAL_INT_TX;
  61 +                       ath_hal_intrset(ah, sc->sc_imask & ~HAL_INT_TX);
  62 +                       sc->sc_imask &= ~HAL_INT_TX;
  63 +
  64                         ATH_SCHEDULE_TQUEUE(&sc->sc_txtq, &needmark);
  65                 }
  66                 if (status & HAL_INT_BMISS) {
  67 @@ -3315,10 +3329,10 @@
  68          *
  69          * XXX Using in_softirq is not right since we might
  70          * be called from other soft irq contexts than
  71 -        * ath_rx_tasklet.
  72 +        * ath_rx_poll
  73          */
  74         if (!in_softirq())
  75 -               tasklet_disable(&sc->sc_rxtq);
  76 +               netif_poll_disable(dev);
  77         netif_stop_queue(dev);
  78  }
  79
  80 @@ -3331,7 +3345,7 @@
  81         DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s:\n", __func__);
  82         netif_start_queue(dev);
  83         if (!in_softirq())              /* NB: see above */
  84 -               tasklet_enable(&sc->sc_rxtq);
  85 +               netif_poll_enable(dev);
  86  }
  87
  88  /*
  89 @@ -5586,13 +5600,12 @@
  90         sc->sc_rxotherant = 0;
  91  }
  92
  93 -static void
  94 -ath_rx_tasklet(TQUEUE_ARG data)
  95 +static int
  96 +ath_rx_poll(struct net_device *dev, int *budget)
  97  {
  98  #define        PA2DESC(_sc, _pa) \
  99         ((struct ath_desc *)((caddr_t)(_sc)->sc_rxdma.dd_desc + \
 100                 ((_pa) - (_sc)->sc_rxdma.dd_desc_paddr)))
 101 -       struct net_device *dev = (struct net_device *)data;
 102         struct ath_buf *bf;
 103         struct ath_softc *sc = dev->priv;
 104         struct ieee80211com *ic = &sc->sc_ic;
 105 @@ -5605,12 +5618,15 @@
 106         int type;
 107         u_int phyerr;
 108         u_int64_t rs_tsf;
 109 +       u_int processed = 0, early_stop = 0;
 110 +       u_int rx_limit = dev->quota;
 111
 112         /* Let the 802.11 layer know about the new noise floor */
 113         sc->sc_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
 114         ic->ic_channoise = sc->sc_channoise;
 115
 116         DPRINTF(sc, ATH_DEBUG_RX_PROC, "%s\n", __func__);
 117 +process_rx_again:
 118         do {
 119                 bf = STAILQ_FIRST(&sc->sc_rxbuf);
 120                 if (bf == NULL) {               /* XXX ??? can this happen */
 121 @@ -5634,6 +5650,13 @@
 122                         /* NB: never process the self-linked entry at the end */
 123                         break;
 124                 }
 125 +
 126 +               processed++;
 127 +               if (rx_limit-- < 0) {
 128 +                       early_stop = 1;
 129 +                       break;
 130 +               }
 131 +
 132                 skb = bf->bf_skb;
 133                 if (skb == NULL) {              /* XXX ??? can this happen */
 134                         printk("%s: no skbuff (%s)\n", DEV_NAME(dev), __func__);
 135 @@ -5672,6 +5695,7 @@
 136                                 sc->sc_stats.ast_rx_phyerr++;
 137                                 phyerr = rs->rs_phyerr & 0x1f;
 138                                 sc->sc_stats.ast_rx_phy[phyerr]++;
 139 +                               goto rx_next;
 140                         }
 141                         if (rs->rs_status & HAL_RXERR_DECRYPT) {
 142                                 /*
 143 @@ -5889,9 +5913,33 @@
 144                 STAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
 145                 ATH_RXBUF_UNLOCK_IRQ(sc);
 146         } while (ath_rxbuf_init(sc, bf) == 0);
 147 +       if (!early_stop) {
 148 +               /* Check if more data is received while we were
 149 +                * processing the descriptor chain.
 150 +                */
 151 +#ifndef ATH_PRECISE_TSF
 152 +               ATH_DISABLE_INTR();
 153 +               if (sc->sc_isr & HAL_INT_RX) {
 154 +                       sc->sc_isr &= ~HAL_INT_RX;
 155 +                       ATH_ENABLE_INTR();
 156 +                       ath_uapsd_processtriggers(sc);
 157 +                       goto process_rx_again;
 158 +               }
 159 +#endif
 160 +               netif_rx_complete(dev);
 161 +
 162 +#ifndef ATH_PRECISE_TSF
 163 +               sc->sc_imask |= HAL_INT_RX;
 164 +               ath_hal_intrset(ah, sc->sc_imask);
 165 +               ATH_ENABLE_INTR();
 166 +#endif
 167 +       }
 168 +
 169 +       *budget -= processed;
 170
 171         /* rx signal state monitoring */
 172         ath_hal_rxmonitor(ah, &sc->sc_halstats, &sc->sc_curchan);
 173 +       return early_stop;
 174  #undef PA2DESC
 175  }
 176
 177 @@ -7514,11 +7562,22 @@
 178         struct net_device *dev = (struct net_device *)data;
 179         struct ath_softc *sc = dev->priv;
 180
 181 +process_tx_again:
 182         if (txqactive(sc->sc_ah, 0))
 183                 ath_tx_processq(sc, &sc->sc_txq[0]);
 184         if (txqactive(sc->sc_ah, sc->sc_cabq->axq_qnum))
 185                 ath_tx_processq(sc, sc->sc_cabq);
 186
 187 +       ATH_DISABLE_INTR();
 188 +       if (sc->sc_isr & HAL_INT_TX) {
 189 +               sc->sc_isr &= ~HAL_INT_TX;
 190 +               ATH_ENABLE_INTR();
 191 +               goto process_tx_again;
 192 +       }
 193 +       sc->sc_imask |= HAL_INT_TX;
 194 +       ath_hal_intrset(sc->sc_ah, sc->sc_imask);
 195 +       ATH_ENABLE_INTR();
 196 +
 197         netif_wake_queue(dev);
 198
 199         if (sc->sc_softled)
 200 @@ -7535,6 +7594,7 @@
 201         struct net_device *dev = (struct net_device *)data;
 202         struct ath_softc *sc = dev->priv;
 203
 204 +process_tx_again:
 205         /*
 206          * Process each active queue.
 207          */
 208 @@ -7555,6 +7615,16 @@
 209         if (sc->sc_uapsdq && txqactive(sc->sc_ah, sc->sc_uapsdq->axq_qnum))
 210                 ath_tx_processq(sc, sc->sc_uapsdq);
 211
 212 +       ATH_DISABLE_INTR();
 213 +       if (sc->sc_isr & HAL_INT_TX) {
 214 +               sc->sc_isr &= ~HAL_INT_TX;
 215 +               ATH_ENABLE_INTR();
 216 +               goto process_tx_again;
 217 +       }
 218 +       sc->sc_imask |= HAL_INT_TX;
 219 +       ath_hal_intrset(sc->sc_ah, sc->sc_imask);
 220 +       ATH_ENABLE_INTR();
 221 +
 222         netif_wake_queue(dev);
 223
 224         if (sc->sc_softled)
 225 @@ -7572,6 +7642,7 @@
 226         unsigned int i;
 227
 228         /* Process each active queue. */
 229 +process_tx_again:
 230         for (i = 0; i < HAL_NUM_TX_QUEUES; i++)
 231                 if (ATH_TXQ_SETUP(sc, i) && txqactive(sc->sc_ah, i))
 232                         ath_tx_processq(sc, &sc->sc_txq[i]);
 233 @@ -7580,6 +7651,16 @@
 234                 ath_tx_processq(sc, sc->sc_xrtxq);
 235  #endif
 236
 237 +       ATH_DISABLE_INTR();
 238 +       if (sc->sc_isr & HAL_INT_TX) {
 239 +               sc->sc_isr &= ~HAL_INT_TX;
 240 +               ATH_ENABLE_INTR();
 241 +               goto process_tx_again;
 242 +       }
 243 +       sc->sc_imask |= HAL_INT_TX;
 244 +       ath_hal_intrset(sc->sc_ah, sc->sc_imask);
 245 +       ATH_ENABLE_INTR();
 246 +
 247         netif_wake_queue(dev);
 248
 249         if (sc->sc_softled)
 250 @@ -7678,6 +7759,7 @@
 251  ath_draintxq(struct ath_softc *sc)
 252  {
 253         struct ath_hal *ah = sc->sc_ah;
 254 +       int npend = 0;
 255         unsigned int i;
 256
 257         /* XXX return value */
 258 @@ -9186,9 +9268,9 @@
 259         dev->mtu = mtu;
 260         if ((dev->flags & IFF_RUNNING) && !sc->sc_invalid) {
 261                 /* NB: the rx buffers may need to be reallocated */
 262 -               tasklet_disable(&sc->sc_rxtq);
 263 +               netif_poll_disable(dev);
 264                 error = ath_reset(dev);
 265 -               tasklet_enable(&sc->sc_rxtq);
 266 +               netif_poll_enable(dev);
 267         }
 268         ATH_UNLOCK(sc);
 269
 270 Index: madwifi-ng-r2568-20070710/ath/if_athvar.h
 271 ===================================================================
 272 --- madwifi-ng-r2568-20070710.orig/ath/if_athvar.h      2007-07-23 01:48:43.126437804 +0200
 273 +++ madwifi-ng-r2568-20070710/ath/if_athvar.h   2007-07-23 01:48:45.030546315 +0200
 274 @@ -49,6 +49,10 @@
 275  #include "net80211/ieee80211.h"                /* XXX for WME_NUM_AC */
 276  #include <asm/io.h>
 277
 278 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
 279 +#define irqs_disabled()                        0
 280 +#endif
 281 +
 282  /*
 283   * Deduce if tasklets are available.  If not then
 284   * fall back to using the immediate work queue.
 285 @@ -635,7 +639,6 @@
 286         struct ath_buf *sc_rxbufcur;            /* current rx buffer */
 287         u_int32_t *sc_rxlink;                   /* link ptr in last RX desc */
 288         spinlock_t sc_rxbuflock;
 289 -       struct ATH_TQ_STRUCT sc_rxtq;           /* rx intr tasklet */
 290         struct ATH_TQ_STRUCT sc_rxorntq;        /* rxorn intr tasklet */
 291         u_int8_t sc_defant;                     /* current default antenna */
 292         u_int8_t sc_rxotherant;                 /* RXs on non-default antenna */
 293 @@ -648,6 +651,7 @@
 294         u_int sc_txintrperiod;                  /* tx interrupt batching */
 295         struct ath_txq sc_txq[HAL_NUM_TX_QUEUES];
 296         struct ath_txq *sc_ac2q[WME_NUM_AC];    /* WME AC -> h/w qnum */
 297 +       HAL_INT sc_isr;                         /* unmasked ISR state */
 298         struct ATH_TQ_STRUCT sc_txtq;           /* tx intr tasklet */
 299         u_int8_t sc_grppoll_str[GRPPOLL_RATE_STR_LEN];
 300         struct ath_descdma sc_bdma;             /* beacon descriptors */
 301 @@ -720,6 +724,8 @@
 302  #define        ATH_TXBUF_LOCK_ASSERT(_sc) \
 303         KASSERT(spin_is_locked(&(_sc)->sc_txbuflock), ("txbuf not locked!"))
 304
 305 +#define ATH_DISABLE_INTR               local_irq_disable
 306 +#define ATH_ENABLE_INTR                local_irq_enable
 307
 308  #define        ATH_RXBUF_LOCK_INIT(_sc)        spin_lock_init(&(_sc)->sc_rxbuflock)
 309  #define        ATH_RXBUF_LOCK_DESTROY(_sc)
 310 Index: madwifi-ng-r2568-20070710/net80211/ieee80211_input.c
 311 ===================================================================
 312 --- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_input.c   2007-07-23 01:48:44.214499810 +0200
 313 +++ madwifi-ng-r2568-20070710/net80211/ieee80211_input.c        2007-07-23 01:48:45.030546315 +0200
 314 @@ -1128,8 +1128,9 @@
 315                 if (ni->ni_vlan != 0 && vap->iv_vlgrp != NULL) {
 316                         /* attach vlan tag */
 317                         vlan_hwaccel_receive_skb(skb, vap->iv_vlgrp, ni->ni_vlan);
 318 -               } else
 319 -                       netif_rx(skb);
 320 +               } else {
 321 +                       netif_receive_skb(skb);
 322 +               }
 323                 dev->last_rx = jiffies;
 324         }
 325  }