huge madwifi update (work in progress, disabled by default, compiles but breaks at...
[openwrt.git] / package / madwifi / patches-r3776 / 300-napi_polling.patch
diff --git a/package/madwifi/patches-r3776/300-napi_polling.patch b/package/madwifi/patches-r3776/300-napi_polling.patch
new file mode 100644 (file)
index 0000000..e7e5bfd
--- /dev/null
@@ -0,0 +1,538 @@
+Index: madwifi-trunk-r3776/ath/if_ath.c
+===================================================================
+--- madwifi-trunk-r3776.orig/ath/if_ath.c      2008-07-17 01:20:11.000000000 +0200
++++ madwifi-trunk-r3776/ath/if_ath.c   2008-07-17 01:46:37.000000000 +0200
+@@ -182,7 +182,11 @@
+       struct sk_buff *, int, int, u_int64_t);
+ static void ath_setdefantenna(struct ath_softc *, u_int);
+ static struct ath_txq *ath_txq_setup(struct ath_softc *, int, int);
+-static void ath_rx_tasklet(TQUEUE_ARG);
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++static int ath_rx_poll(struct napi_struct *napi, int budget);
++#else
++static int ath_rx_poll(struct net_device *dev, int *budget);
++#endif
+ static int ath_hardstart(struct sk_buff *, struct net_device *);
+ static int ath_mgtstart(struct ieee80211com *, struct sk_buff *);
+ #ifdef ATH_SUPERG_COMP
+@@ -331,6 +335,9 @@
+ static u_int32_t ath_set_clamped_maxtxpower(struct ath_softc *sc, 
+               u_int32_t new_clamped_maxtxpower);
++static void ath_poll_disable(struct net_device *dev);
++static void ath_poll_enable(struct net_device *dev);
++
+ static void ath_scanbufs(struct ath_softc *sc);
+ static int ath_debug_iwpriv(struct ieee80211com *ic, 
+               unsigned int param, unsigned int value);
+@@ -518,7 +525,6 @@
+       atomic_set(&sc->sc_txbuf_counter, 0);
+-      ATH_INIT_TQUEUE(&sc->sc_rxtq,           ath_rx_tasklet,         dev);
+       ATH_INIT_TQUEUE(&sc->sc_txtq,           ath_tx_tasklet,         dev);
+       ATH_INIT_TQUEUE(&sc->sc_bmisstq,        ath_bmiss_tasklet,      dev);
+       ATH_INIT_TQUEUE(&sc->sc_bstucktq,       ath_bstuck_tasklet,     dev);
+@@ -833,6 +839,12 @@
+       dev->set_mac_address = ath_set_mac_address;
+       dev->change_mtu = ath_change_mtu;
+       dev->tx_queue_len = ATH_TXBUF - ATH_TXBUF_MGT_RESERVED;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++      netif_napi_add(dev, &sc->sc_napi, ath_rx_poll, 64);
++#else
++      dev->poll = ath_rx_poll;
++      dev->weight = 64;
++#endif
+ #ifdef USE_HEADERLEN_RESV
+       dev->hard_header_len += sizeof(struct ieee80211_qosframe) +
+                               sizeof(struct llc) +
+@@ -1770,7 +1782,7 @@
+ }
+ static void
+-ath_intr_process_rx_descriptors(struct ath_softc *sc, int *pneedmark, u_int64_t hw_tsf)
++ath_intr_process_rx_descriptors(struct ath_softc *sc, int *pneedmark, u_int64_t hw_tsf, int schedule)
+ {
+       struct ath_hal *ah = sc->sc_ah;
+       struct ath_desc *ds;
+@@ -2252,8 +2264,25 @@
+       }
+       /* If we got something to process, schedule rx queue to handle it */
+-      if (count)
+-              ATH_SCHEDULE_TQUEUE(&sc->sc_rxtq, pneedmark);
++      if (count) {
++              sc->sc_isr &= ~HAL_INT_RX;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++              if (netif_rx_schedule_prep(sc->sc_dev, &sc->sc_napi))
++#else
++              if (netif_rx_schedule_prep(sc->sc_dev))
++#endif
++              {
++#ifndef ATH_PRECISE_TSF
++                      sc->sc_imask &= ~HAL_INT_RX;
++                      ath_hal_intrset(ah, sc->sc_imask);
++#endif
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++                      __netif_rx_schedule(sc->sc_dev, &sc->sc_napi);
++#else
++                      __netif_rx_schedule(sc->sc_dev);
++#endif
++              }
++      }
+       ATH_RXBUF_UNLOCK_IRQ(sc);
+ #undef PA2DESC
+ }
+@@ -2343,6 +2372,7 @@
+               (status & HAL_INT_GLOBAL)       ? " HAL_INT_GLOBAL"     : ""
+               );
++      sc->sc_isr = status;
+       status &= sc->sc_imask;                 /* discard unasked for bits */
+       /* As soon as we know we have a real interrupt we intend to service, 
+        * we will check to see if we need an initial hardware TSF reading. 
+@@ -2400,7 +2430,7 @@
+               }
+               if (status & (HAL_INT_RX | HAL_INT_RXPHY)) {
+                       /* NB: Will schedule rx tasklet if necessary. */
+-                      ath_intr_process_rx_descriptors(sc, &needmark, hw_tsf);
++                      ath_intr_process_rx_descriptors(sc, &needmark, hw_tsf, 1);
+               }
+               if (status & HAL_INT_TX) {
+ #ifdef ATH_SUPERG_DYNTURBO
+@@ -2426,6 +2456,11 @@
+                               }
+                       }
+ #endif
++                      /* disable transmit interrupt */
++                      sc->sc_isr &= ~HAL_INT_TX;
++                      ath_hal_intrset(ah, sc->sc_imask & ~HAL_INT_TX);
++                      sc->sc_imask &= ~HAL_INT_TX;
++
+                       ATH_SCHEDULE_TQUEUE(&sc->sc_txtq, &needmark);
+               }
+               if (status & HAL_INT_BMISS) {
+@@ -2617,6 +2652,7 @@
+       if (sc->sc_tx99 != NULL)
+               sc->sc_tx99->start(sc->sc_tx99);
+ #endif
++      ath_poll_enable(dev);
+ done:
+       ATH_UNLOCK(sc);
+@@ -2657,6 +2693,9 @@
+               if (sc->sc_tx99 != NULL)
+                       sc->sc_tx99->stop(sc->sc_tx99);
+ #endif
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++              ath_poll_disable(dev);
++#endif
+               netif_stop_queue(dev);  /* XXX re-enabled by ath_newstate */
+               dev->flags &= ~IFF_RUNNING;     /* NB: avoid recursion */
+               ieee80211_stop_running(ic);     /* stop all VAPs */
+@@ -4109,6 +4148,39 @@
+       return ath_keyset(sc, k, mac, vap->iv_bss);
+ }
++static void ath_poll_disable(struct net_device *dev)
++{
++      struct ath_softc *sc = dev->priv;
++
++      /*
++       * XXX Using in_softirq is not right since we might
++       * be called from other soft irq contexts than
++       * ath_rx_poll
++       */
++      if (!in_softirq()) {
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++              napi_disable(&sc->sc_napi);
++#else
++              netif_poll_disable(dev);
++#endif
++      }
++}
++
++static void ath_poll_enable(struct net_device *dev)
++{
++      struct ath_softc *sc = dev->priv;
++
++      /* NB: see above */
++      if (!in_softirq()) {
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++              napi_enable(&sc->sc_napi);
++#else
++              netif_poll_enable(dev);
++#endif
++      }
++}
++
++
+ /*
+  * Block/unblock tx+rx processing while a key change is done.
+  * We assume the caller serializes key management operations
+@@ -4119,33 +4191,26 @@
+ ath_key_update_begin(struct ieee80211vap *vap)
+ {
+       struct net_device *dev = vap->iv_ic->ic_dev;
+-      struct ath_softc *sc = dev->priv;
+       DPRINTF(sc, ATH_DEBUG_KEYCACHE, "Begin\n");
+       /*
+        * When called from the rx tasklet we cannot use
+        * tasklet_disable because it will block waiting
+        * for us to complete execution.
+-       *
+-       * XXX Using in_softirq is not right since we might
+-       * be called from other soft irq contexts than
+-       * ath_rx_tasklet.
+        */
+-      if (!in_softirq())
+-              tasklet_disable(&sc->sc_rxtq);
+-      netif_stop_queue(dev);
++      if ((dev->flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))
++              netif_stop_queue(dev);
+ }
+ static void
+ ath_key_update_end(struct ieee80211vap *vap)
+ {
+       struct net_device *dev = vap->iv_ic->ic_dev;
+-      struct ath_softc *sc = dev->priv;
+       DPRINTF(sc, ATH_DEBUG_KEYCACHE, "End\n");
+-      netif_wake_queue(dev);
+-      if (!in_softirq())              /* NB: see above */
+-              tasklet_enable(&sc->sc_rxtq);
++
++      if ((dev->flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))
++              netif_wake_queue(dev);
+ }
+ /*
+@@ -6405,15 +6470,25 @@
+       sc->sc_numrxotherant = 0;
+ }
+-static void
+-ath_rx_tasklet(TQUEUE_ARG data)
++static int
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++ath_rx_poll(struct napi_struct *napi, int budget)
++#else
++ath_rx_poll(struct net_device *dev, int *budget)
++#endif
+ {
+ #define       PA2DESC(_sc, _pa) \
+       ((struct ath_desc *)((caddr_t)(_sc)->sc_rxdma.dd_desc + \
+               ((_pa) - (_sc)->sc_rxdma.dd_desc_paddr)))
+-      struct net_device *dev = (struct net_device *)data;
+-      struct ath_buf *bf;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++      struct ath_softc *sc = container_of(napi, struct ath_softc, sc_napi);
++      struct net_device *dev = sc->sc_dev;
++      u_int rx_limit = budget;
++#else
+       struct ath_softc *sc = dev->priv;
++      u_int rx_limit = min(dev->quota, *budget);
++#endif
++      struct ath_buf *bf;
+       struct ieee80211com *ic = &sc->sc_ic;
+       struct ath_hal *ah = sc ? sc->sc_ah : NULL;
+       struct ath_desc *ds;
+@@ -6421,6 +6496,7 @@
+       struct ieee80211_node *ni;
+       struct sk_buff *skb = NULL;
+       unsigned int len, phyerr, mic_fail = 0;
++      unsigned int early_stop = 0;
+       int type = -1; /* undefined */
+       int init_ret = 0;
+       int bf_processed = 0;
+@@ -6428,6 +6504,7 @@
+       int errors       = 0;
+       DPRINTF(sc, ATH_DEBUG_RX_PROC, "%s started...\n", __func__);
++process_rx_again:
+       do {
+               /* Get next RX buffer pending processing by RX tasklet...
+                *  
+@@ -6457,6 +6534,10 @@
+                       break;
+               bf_processed++;
++              if (rx_limit-- < 0) {
++                      early_stop = 1;
++                      break;
++              }
+               ds  = bf->bf_desc;
+ #ifdef AR_DEBUG
+@@ -6491,6 +6572,7 @@
+                               sc->sc_stats.ast_rx_phyerr++;
+                               phyerr = rs->rs_phyerr & 0x1f;
+                               sc->sc_stats.ast_rx_phy[phyerr]++;
++                              goto rx_next;
+                       }
+                       if (rs->rs_status & HAL_RXERR_DECRYPT) {
+                               /* Decrypt error.  If the error occurred
+@@ -6689,6 +6771,33 @@
+               STAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
+               ATH_RXBUF_UNLOCK_IRQ(sc);
+       } while (1);
++      if (!early_stop) {
++              unsigned long flags;
++              /* Check if more data is received while we were
++               * processing the descriptor chain.
++               */
++#ifndef ATH_PRECISE_TSF
++              local_irq_save(flags);
++              if (sc->sc_isr & HAL_INT_RX) {
++                      u_int64_t hw_tsf = ath_hal_gettsf64(ah);
++                      sc->sc_isr &= ~HAL_INT_RX;
++                      local_irq_restore(flags);
++                      ath_intr_process_rx_descriptors(sc, NULL, hw_tsf, 0);
++                      goto process_rx_again;
++              }
++              sc->sc_imask |= HAL_INT_RX;
++              ath_hal_intrset(ah, sc->sc_imask);
++              local_irq_restore(flags);
++#endif
++      }
++
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++      netif_rx_complete(dev, napi);
++#else
++      netif_rx_complete(dev);
++      *budget -= bf_processed;
++      dev->quota -= bf_processed;
++#endif
+       if (sc->sc_useintmit) 
+               ath_hal_rxmonitor(ah, &sc->sc_halstats, &sc->sc_curchan);
+@@ -6701,6 +6810,12 @@
+               " %d rx buf processed. %d were errors. %d skb accepted.\n",
+               __func__, bf_processed, errors, skb_accepted);
+ #undef PA2DESC
++
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++      return bf_processed;
++#else
++      return early_stop;
++#endif
+ }
+ #ifdef ATH_SUPERG_XR
+@@ -8306,12 +8421,24 @@
+ {
+       struct net_device *dev = (struct net_device *)data;
+       struct ath_softc *sc = dev->priv;
++      unsigned long flags;
++process_tx_again:
+       if (txqactive(sc->sc_ah, 0))
+               ath_tx_processq(sc, &sc->sc_txq[0]);
+       if (txqactive(sc->sc_ah, sc->sc_cabq->axq_qnum))
+               ath_tx_processq(sc, sc->sc_cabq);
++      local_irq_save(flags);
++      if (sc->sc_isr & HAL_INT_TX) {
++              sc->sc_isr &= ~HAL_INT_TX;
++              local_irq_restore(flags);
++              goto process_tx_again;
++      }
++      sc->sc_imask |= HAL_INT_TX;
++      ath_hal_intrset(sc->sc_ah, sc->sc_imask);
++      local_irq_restore(flags);
++
+       netif_wake_queue(dev);
+       if (sc->sc_softled)
+@@ -8327,7 +8454,9 @@
+ {
+       struct net_device *dev = (struct net_device *)data;
+       struct ath_softc *sc = dev->priv;
++      unsigned long flags;
++process_tx_again:
+       /*
+        * Process each active queue.
+        */
+@@ -8357,6 +8486,16 @@
+       if (sc->sc_uapsdq && txqactive(sc->sc_ah, sc->sc_uapsdq->axq_qnum))
+               ath_tx_processq(sc, sc->sc_uapsdq);
++      local_irq_save(flags);
++      if (sc->sc_isr & HAL_INT_TX) {
++              sc->sc_isr &= ~HAL_INT_TX;
++              local_irq_restore(flags);
++              goto process_tx_again;
++      }
++      sc->sc_imask |= HAL_INT_TX;
++      ath_hal_intrset(sc->sc_ah, sc->sc_imask);
++      local_irq_restore(flags);
++
+       netif_wake_queue(dev);
+       if (sc->sc_softled)
+@@ -10322,9 +10461,9 @@
+       dev->mtu = mtu;
+       if ((dev->flags & IFF_RUNNING) && !sc->sc_invalid) {
+               /* NB: the rx buffers may need to be reallocated */
+-              tasklet_disable(&sc->sc_rxtq);
++              ath_poll_disable(dev);
+               error = ath_reset(dev);
+-              tasklet_enable(&sc->sc_rxtq);
++              ath_poll_enable(dev);
+       }
+       ATH_UNLOCK(sc);
+Index: madwifi-trunk-r3776/ath/if_athvar.h
+===================================================================
+--- madwifi-trunk-r3776.orig/ath/if_athvar.h   2008-07-17 00:52:28.000000000 +0200
++++ madwifi-trunk-r3776/ath/if_athvar.h        2008-07-17 01:27:21.000000000 +0200
+@@ -56,6 +56,10 @@
+ # include     <asm/bitops.h>
+ #endif
++#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
++#define irqs_disabled()                       0
++#endif
++
+ /*
+  * Deduce if tasklets are available.  If not then
+  * fall back to using the immediate work queue.
+@@ -644,6 +648,9 @@
+ struct ath_softc {
+       struct ieee80211com sc_ic;              /* NB: must be first */
+       struct net_device *sc_dev;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
++      struct napi_struct sc_napi;
++#endif
+       void __iomem *sc_iobase;                /* address of the device */
+       struct semaphore sc_lock;               /* dev-level lock */
+       struct net_device_stats sc_devstats;    /* device statistics */
+@@ -756,7 +763,6 @@
+       struct ath_buf *sc_rxbufcur;            /* current rx buffer */
+       u_int32_t *sc_rxlink;                   /* link ptr in last RX desc */
+       spinlock_t sc_rxbuflock;
+-      struct ATH_TQ_STRUCT sc_rxtq;           /* rx intr tasklet */
+       struct ATH_TQ_STRUCT sc_rxorntq;        /* rxorn intr tasklet */
+       u_int16_t sc_cachelsz;                  /* cache line size */
+@@ -769,6 +775,7 @@
+       u_int sc_txintrperiod;                  /* tx interrupt batching */
+       struct ath_txq sc_txq[HAL_NUM_TX_QUEUES];
+       struct ath_txq *sc_ac2q[WME_NUM_AC];    /* WME AC -> h/w qnum */
++      HAL_INT sc_isr;                         /* unmasked ISR state */
+       struct ATH_TQ_STRUCT sc_txtq;           /* tx intr tasklet */
+       u_int8_t sc_grppoll_str[GRPPOLL_RATE_STR_LEN];
+       struct ath_descdma sc_bdma;             /* beacon descriptors */
+@@ -888,6 +895,8 @@
+ #define       ATH_TXBUF_LOCK_CHECK(_sc)
+ #endif
++#define ATH_DISABLE_INTR              local_irq_disable
++#define ATH_ENABLE_INTR               local_irq_enable
+ #define       ATH_RXBUF_LOCK_INIT(_sc)        spin_lock_init(&(_sc)->sc_rxbuflock)
+ #define       ATH_RXBUF_LOCK_DESTROY(_sc)
+Index: madwifi-trunk-r3776/net80211/ieee80211_skb.c
+===================================================================
+--- madwifi-trunk-r3776.orig/net80211/ieee80211_skb.c  2008-07-17 00:21:29.000000000 +0200
++++ madwifi-trunk-r3776/net80211/ieee80211_skb.c       2008-07-17 01:42:17.000000000 +0200
+@@ -73,7 +73,7 @@
+ #undef dev_queue_xmit
+ #undef kfree_skb
+ #undef kfree_skb_fast
+-#undef netif_rx
++#undef netif_receive_skb
+ #undef pskb_copy
+ #undef skb_clone
+ #undef skb_copy
+@@ -581,8 +581,8 @@
+               grp, vlan_tag);
+ }
+-int netif_rx_debug(struct sk_buff *skb, const char *func, int line) {
+-      return netif_rx(untrack_skb(skb, 0, __func__, __LINE__));
++int netif_receive_skb_debug(struct sk_buff *skb, const char *func, int line) {
++      return netif_receive_skb(untrack_skb(skb, 0, __func__, __LINE__));
+ }
+ struct sk_buff *alloc_skb_debug(unsigned int length, gfp_t gfp_mask,
+@@ -707,7 +707,7 @@
+ }
+ EXPORT_SYMBOL(vlan_hwaccel_rx_debug);
+-EXPORT_SYMBOL(netif_rx_debug);
++EXPORT_SYMBOL(netif_receive_skb_debug);
+ EXPORT_SYMBOL(alloc_skb_debug);
+ EXPORT_SYMBOL(dev_alloc_skb_debug);
+ EXPORT_SYMBOL(skb_clone_debug);
+Index: madwifi-trunk-r3776/net80211/ieee80211_skb.h
+===================================================================
+--- madwifi-trunk-r3776.orig/net80211/ieee80211_skb.h  2008-07-17 00:21:29.000000000 +0200
++++ madwifi-trunk-r3776/net80211/ieee80211_skb.h       2008-07-17 01:42:43.000000000 +0200
+@@ -115,7 +115,7 @@
+ int vlan_hwaccel_rx_debug(struct sk_buff *skb, struct vlan_group *grp,
+               unsigned short vlan_tag, const char *func, int line);
+-int netif_rx_debug(struct sk_buff *skb, const char *func, int line);
++int netif_receive_skb_debug(struct sk_buff *skb, const char *func, int line);
+ struct sk_buff *alloc_skb_debug(unsigned int length, gfp_t gfp_mask,
+               const char *func, int line);
+ struct sk_buff *dev_alloc_skb_debug(unsigned int length,
+@@ -150,7 +150,7 @@
+ #undef dev_queue_xmit
+ #undef kfree_skb
+ #undef kfree_skb_fast
+-#undef netif_rx
++#undef netif_receive_skb
+ #undef pskb_copy
+ #undef skb_clone
+ #undef skb_copy
+@@ -167,8 +167,8 @@
+       skb_copy_expand_debug(_skb, _newheadroom, _newtailroom, _gfp_mask, __func__, __LINE__)
+ #define vlan_hwaccel_rx(_skb, _grp, _tag) \
+       vlan_hwaccel_rx_debug(_skb, _grp, _tag, __func__, __LINE__)
+-#define netif_rx(_skb) \
+-      netif_rx_debug(_skb, __func__, __LINE__)
++#define netif_receive_skb(_skb) \
++      netif_receive_skb_debug(_skb, __func__, __LINE__)
+ #define       alloc_skb(_length, _gfp_mask) \
+       alloc_skb_debug(_length, _gfp_mask, __func__, __LINE__)
+ #define       dev_alloc_skb(_length) \
+Index: madwifi-trunk-r3776/net80211/ieee80211_input.c
+===================================================================
+--- madwifi-trunk-r3776.orig/net80211/ieee80211_input.c        2008-07-17 00:21:29.000000000 +0200
++++ madwifi-trunk-r3776/net80211/ieee80211_input.c     2008-07-17 01:41:16.000000000 +0200
+@@ -1185,7 +1185,7 @@
+                       ret = vlan_hwaccel_rx(skb,
+                                       vap->iv_vlgrp, ni->ni_vlan);
+               else
+-                      ret = netif_rx(skb);
++                      ret = netif_receive_skb(skb);
+               if (ret == NET_RX_DROP)
+                       vap->iv_devstats.rx_dropped++;
+               if (tni != NULL)
+@@ -2285,7 +2285,7 @@
+               if (SKB_NI(skb1) != NULL)
+                       ieee80211_unref_node(&SKB_NI(skb1));
+-              if (netif_rx(skb1) == NET_RX_DROP)
++              if (netif_receive_skb(skb1) == NET_RX_DROP)
+                       vap->iv_devstats.rx_dropped++;
+       }
+ }
+Index: madwifi-trunk-r3776/net80211/ieee80211_monitor.c
+===================================================================
+--- madwifi-trunk-r3776.orig/net80211/ieee80211_monitor.c      2008-07-17 00:21:29.000000000 +0200
++++ madwifi-trunk-r3776/net80211/ieee80211_monitor.c   2008-07-17 01:41:51.000000000 +0200
+@@ -580,7 +580,7 @@
+                       if (SKB_NI(skb1) != NULL)
+                               ieee80211_unref_node(&SKB_NI(skb1));
+-                      if (netif_rx(skb1) == NET_RX_DROP)
++                      if (netif_receive_skb(skb1) == NET_RX_DROP)
+                               vap->iv_devstats.rx_dropped++;
+                       skb1 = NULL;
+               }
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