Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[sfrench/cifs-2.6.git] / drivers / net / r8169.c

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 0b6e8c89683581efdfc35925adaa018998468db5..3b19e0ce290fa4b6ba5f53a0b33c23b30ef098f8 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -66,7 +66,6 @@ static const int multicast_filter_limit = 32;
 #define RX_DMA_BURST   6       /* Maximum PCI burst, '6' is 1024 */
 #define TX_DMA_BURST   6       /* Maximum PCI burst, '6' is 1024 */
 #define EarlyTxThld    0x3F    /* 0x3F means NO early transmit */
-#define RxPacketMaxSize        0x3FE8  /* 16K - 1 - ETH_HLEN - VLAN - CRC... */
 #define SafeMtu                0x1c20  /* ... actually life sucks beyond ~7k */
 #define InterFrameGap  0x03    /* 3 means InterFrameGap = the shortest one */
 
@@ -2357,10 +2356,10 @@ static u16 rtl_rw_cpluscmd(void __iomem *ioaddr)
        return cmd;
 }
 
-static void rtl_set_rx_max_size(void __iomem *ioaddr)
+static void rtl_set_rx_max_size(void __iomem *ioaddr, unsigned int rx_buf_sz)
 {
        /* Low hurts. Let's disable the filtering. */
-       RTL_W16(RxMaxSize, 16383);
+       RTL_W16(RxMaxSize, rx_buf_sz);
 }
 
 static void rtl8169_set_magic_reg(void __iomem *ioaddr, unsigned mac_version)
@@ -2407,7 +2406,7 @@ static void rtl_hw_start_8169(struct net_device *dev)
 
        RTL_W8(EarlyTxThres, EarlyTxThld);
 
-       rtl_set_rx_max_size(ioaddr);
+       rtl_set_rx_max_size(ioaddr, tp->rx_buf_sz);
 
        if ((tp->mac_version == RTL_GIGA_MAC_VER_01) ||
            (tp->mac_version == RTL_GIGA_MAC_VER_02) ||
@@ -2668,7 +2667,7 @@ static void rtl_hw_start_8168(struct net_device *dev)
 
        RTL_W8(EarlyTxThres, EarlyTxThld);
 
-       rtl_set_rx_max_size(ioaddr);
+       rtl_set_rx_max_size(ioaddr, tp->rx_buf_sz);
 
        tp->cp_cmd |= RTL_R16(CPlusCmd) | PktCntrDisable | INTT_1;
 
@@ -2846,7 +2845,7 @@ static void rtl_hw_start_8101(struct net_device *dev)
 
        RTL_W8(EarlyTxThres, EarlyTxThld);
 
-       rtl_set_rx_max_size(ioaddr);
+       rtl_set_rx_max_size(ioaddr, tp->rx_buf_sz);
 
        tp->cp_cmd |= rtl_rw_cpluscmd(ioaddr) | PCIMulRW;
 
@@ -3554,54 +3553,64 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
        int handled = 0;
        int status;
 
+       /* loop handling interrupts until we have no new ones or
+        * we hit a invalid/hotplug case.
+        */
        status = RTL_R16(IntrStatus);
+       while (status && status != 0xffff) {
+               handled = 1;
 
-       /* hotplug/major error/no more work/shared irq */
-       if ((status == 0xffff) || !status)
-               goto out;
-
-       handled = 1;
+               /* Handle all of the error cases first. These will reset
+                * the chip, so just exit the loop.
+                */
+               if (unlikely(!netif_running(dev))) {
+                       rtl8169_asic_down(ioaddr);
+                       break;
+               }
 
-       if (unlikely(!netif_running(dev))) {
-               rtl8169_asic_down(ioaddr);
-               goto out;
-       }
+               /* Work around for rx fifo overflow */
+               if (unlikely(status & RxFIFOOver) &&
+               (tp->mac_version == RTL_GIGA_MAC_VER_11)) {
+                       netif_stop_queue(dev);
+                       rtl8169_tx_timeout(dev);
+                       break;
+               }
 
-       status &= tp->intr_mask;
-       RTL_W16(IntrStatus,
-               (status & RxFIFOOver) ? (status | RxOverflow) : status);
+               if (unlikely(status & SYSErr)) {
+                       rtl8169_pcierr_interrupt(dev);
+                       break;
+               }
 
-       if (!(status & tp->intr_event))
-               goto out;
+               if (status & LinkChg)
+                       rtl8169_check_link_status(dev, tp, ioaddr);
 
-       /* Work around for rx fifo overflow */
-       if (unlikely(status & RxFIFOOver) &&
-           (tp->mac_version == RTL_GIGA_MAC_VER_11)) {
-               netif_stop_queue(dev);
-               rtl8169_tx_timeout(dev);
-               goto out;
-       }
+               /* We need to see the lastest version of tp->intr_mask to
+                * avoid ignoring an MSI interrupt and having to wait for
+                * another event which may never come.
+                */
+               smp_rmb();
+               if (status & tp->intr_mask & tp->napi_event) {
+                       RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
+                       tp->intr_mask = ~tp->napi_event;
+
+                       if (likely(napi_schedule_prep(&tp->napi)))
+                               __napi_schedule(&tp->napi);
+                       else if (netif_msg_intr(tp)) {
+                               printk(KERN_INFO "%s: interrupt %04x in poll\n",
+                               dev->name, status);
+                       }
+               }
 
-       if (unlikely(status & SYSErr)) {
-               rtl8169_pcierr_interrupt(dev);
-               goto out;
+               /* We only get a new MSI interrupt when all active irq
+                * sources on the chip have been acknowledged. So, ack
+                * everything we've seen and check if new sources have become
+                * active to avoid blocking all interrupts from the chip.
+                */
+               RTL_W16(IntrStatus,
+                       (status & RxFIFOOver) ? (status | RxOverflow) : status);
+               status = RTL_R16(IntrStatus);
        }
 
-       if (status & LinkChg)
-               rtl8169_check_link_status(dev, tp, ioaddr);
-
-       if (status & tp->napi_event) {
-               RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
-               tp->intr_mask = ~tp->napi_event;
-
-               if (likely(napi_schedule_prep(&tp->napi)))
-                       __napi_schedule(&tp->napi);
-               else if (netif_msg_intr(tp)) {
-                       printk(KERN_INFO "%s: interrupt %04x in poll\n",
-                              dev->name, status);
-               }
-       }
-out:
        return IRQ_RETVAL(handled);
 }
 
@@ -3617,13 +3626,15 @@ static int rtl8169_poll(struct napi_struct *napi, int budget)
 
        if (work_done < budget) {
                napi_complete(napi);
-               tp->intr_mask = 0xffff;
-               /*
-                * 20040426: the barrier is not strictly required but the
-                * behavior of the irq handler could be less predictable
-                * without it. Btw, the lack of flush for the posted pci
-                * write is safe - FR
+
+               /* We need for force the visibility of tp->intr_mask
+                * for other CPUs, as we can loose an MSI interrupt
+                * and potentially wait for a retransmit timeout if we don't.
+                * The posted write to IntrMask is safe, as it will
+                * eventually make it to the chip and we won't loose anything
+                * until it does.
                 */
+               tp->intr_mask = 0xffff;
                smp_wmb();
                RTL_W16(IntrMask, tp->intr_event);
        }