r8169: Rx FIFO overflow fixes.

Realtek has specified that the post 8168c gigabit chips and the post
8105e fast ethernet chips recover automatically from a Rx FIFO overflow.
The driver does not need to clear the RxFIFOOver bit of IntrStatus and
it should rather avoid messing it.

The implementation deserves some explanation:
1. events outside of the intr_event bit mask are now ignored. It enforces
   a no-processing policy for the events that either should not be there
   or should be ignored.

2. RxFIFOOver was already ignored in rtl_cfg_infos[RTL_CFG_1] for the
   whole 8168 line of chips with two exceptions:
   - RTL_GIGA_MAC_VER_22 since b5ba6d12bdac21bc0620a5089e0f24e362645efd
     ("use RxFIFO overflow workaround for 8168c chipset.").
     This one should now be correctly handled.
   - RTL_GIGA_MAC_VER_11 (8168b) which requires a different Rx FIFO
     overflow processing.

   Though it does not conform to Realtek suggestion above, the updated
   driver includes no change for RTL_GIGA_MAC_VER_12 and RTL_GIGA_MAC_VER_17.
   Both are 8168b. RTL_GIGA_MAC_VER_12 is common and a bit old so I'd rather
   wait for experimental evidence that the change suggested by Realtek really
   helps or does not hurt in unexpected ways.

   Removed case statements in rtl8169_interrupt are only 8168 relevant.

3. RxFIFOOver is masked for post 8105e 810x chips, namely the sole 8105e
   (RTL_GIGA_MAC_VER_30) itself.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: hayeswang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 6f06aa1..7a1e3a6 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -1183,11 +1183,13 @@ static u8 rtl8168d_efuse_read(void __iomem *ioaddr, int reg_addr)
        return value;
 }
 
-static void rtl8169_irq_mask_and_ack(void __iomem *ioaddr)
+static void rtl8169_irq_mask_and_ack(struct rtl8169_private *tp)
 {
-       RTL_W16(IntrMask, 0x0000);
+       void __iomem *ioaddr = tp->mmio_addr;
 
-       RTL_W16(IntrStatus, 0xffff);
+       RTL_W16(IntrMask, 0x0000);
+       RTL_W16(IntrStatus, tp->intr_event);
+       RTL_R8(ChipCmd);
 }
 
 static unsigned int rtl8169_tbi_reset_pending(struct rtl8169_private *tp)
@@ -4339,7 +4341,7 @@ static void rtl8169_hw_reset(struct rtl8169_private *tp)
        void __iomem *ioaddr = tp->mmio_addr;
 
        /* Disable interrupts */
-       rtl8169_irq_mask_and_ack(ioaddr);
+       rtl8169_irq_mask_and_ack(tp);
 
        rtl_rx_close(tp);
 
@@ -4885,8 +4887,7 @@ static void rtl_hw_start_8168(struct net_device *dev)
        RTL_W16(IntrMitigate, 0x5151);
 
        /* Work around for RxFIFO overflow. */
-       if (tp->mac_version == RTL_GIGA_MAC_VER_11 ||
-           tp->mac_version == RTL_GIGA_MAC_VER_22) {
+       if (tp->mac_version == RTL_GIGA_MAC_VER_11) {
                tp->intr_event |= RxFIFOOver | PCSTimeout;
                tp->intr_event &= ~RxOverflow;
        }
@@ -5076,6 +5077,11 @@ static void rtl_hw_start_8101(struct net_device *dev)
        void __iomem *ioaddr = tp->mmio_addr;
        struct pci_dev *pdev = tp->pci_dev;
 
+       if (tp->mac_version >= RTL_GIGA_MAC_VER_30) {
+               tp->intr_event &= ~RxFIFOOver;
+               tp->napi_event &= ~RxFIFOOver;
+       }
+
        if (tp->mac_version == RTL_GIGA_MAC_VER_13 ||
            tp->mac_version == RTL_GIGA_MAC_VER_16) {
                int cap = pci_pcie_cap(pdev);
@@ -5342,7 +5348,7 @@ static void rtl8169_wait_for_quiescence(struct net_device *dev)
        /* Wait for any pending NAPI task to complete */
        napi_disable(&tp->napi);
 
-       rtl8169_irq_mask_and_ack(ioaddr);
+       rtl8169_irq_mask_and_ack(tp);
 
        tp->intr_mask = 0xffff;
        RTL_W16(IntrMask, tp->intr_event);
@@ -5804,6 +5810,10 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
         */
        status = RTL_R16(IntrStatus);
        while (status && status != 0xffff) {
+               status &= tp->intr_event;
+               if (!status)
+                       break;
+
                handled = 1;
 
                /* Handle all of the error cases first. These will reset
@@ -5818,27 +5828,9 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
                        switch (tp->mac_version) {
                        /* Work around for rx fifo overflow */
                        case RTL_GIGA_MAC_VER_11:
-                       case RTL_GIGA_MAC_VER_22:
-                       case RTL_GIGA_MAC_VER_26:
                                netif_stop_queue(dev);
                                rtl8169_tx_timeout(dev);
                                goto done;
-                       /* Testers needed. */
-                       case RTL_GIGA_MAC_VER_17:
-                       case RTL_GIGA_MAC_VER_19:
-                       case RTL_GIGA_MAC_VER_20:
-                       case RTL_GIGA_MAC_VER_21:
-                       case RTL_GIGA_MAC_VER_23:
-                       case RTL_GIGA_MAC_VER_24:
-                       case RTL_GIGA_MAC_VER_27:
-                       case RTL_GIGA_MAC_VER_28:
-                       case RTL_GIGA_MAC_VER_31:
-                       /* Experimental science. Pktgen proof. */
-                       case RTL_GIGA_MAC_VER_12:
-                       case RTL_GIGA_MAC_VER_25:
-                               if (status == RxFIFOOver)
-                                       goto done;
-                               break;
                        default:
                                break;
                        }