Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[safe/jmp/linux-2.6] / drivers / net / r8169.c

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 64cd250..340da39 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -187,8 +187,13 @@ static DEFINE_PCI_DEVICE_TABLE(rtl8169_pci_tbl) = {
 
 MODULE_DEVICE_TABLE(pci, rtl8169_pci_tbl);
 
-static int rx_copybreak = 200;
-static int use_dac = -1;
+/*
+ * we set our copybreak very high so that we don't have
+ * to allocate 16k frames all the time (see note in
+ * rtl8169_open()
+ */
+static int rx_copybreak = 16383;
+static int use_dac;
 static struct {
        u32 msg_enable;
 } debug = { -1 };
@@ -513,8 +518,7 @@ MODULE_DESCRIPTION("RealTek RTL-8169 Gigabit Ethernet driver");
 module_param(rx_copybreak, int, 0);
 MODULE_PARM_DESC(rx_copybreak, "Copy breakpoint for copy-only-tiny-frames");
 module_param(use_dac, int, 0);
-MODULE_PARM_DESC(use_dac, "Enable PCI DAC. -1 defaults on for PCI Express only."
-" Unsafe on 32 bit PCI slot.");
+MODULE_PARM_DESC(use_dac, "Enable PCI DAC. Unsafe on 32 bit PCI slot.");
 module_param_named(debug, debug.msg_enable, int, 0);
 MODULE_PARM_DESC(debug, "Debug verbosity level (0=none, ..., 16=all)");
 MODULE_LICENSE("GPL");
@@ -2837,8 +2841,8 @@ static void rtl_rar_set(struct rtl8169_private *tp, u8 *addr)
        spin_lock_irq(&tp->lock);
 
        RTL_W8(Cfg9346, Cfg9346_Unlock);
-       RTL_W32(MAC0, low);
        RTL_W32(MAC4, high);
+       RTL_W32(MAC0, low);
        RTL_W8(Cfg9346, Cfg9346_Lock);
 
        spin_unlock_irq(&tp->lock);
@@ -2990,7 +2994,6 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
        void __iomem *ioaddr;
        unsigned int i;
        int rc;
-       int this_use_dac = use_dac;
 
        if (netif_msg_drv(&debug)) {
                printk(KERN_INFO "%s Gigabit Ethernet driver %s loaded\n",
@@ -3056,17 +3059,8 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
        tp->cp_cmd = PCIMulRW | RxChkSum;
 
-       tp->pcie_cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-       if (!tp->pcie_cap)
-               netif_info(tp, probe, dev, "no PCI Express capability\n");
-
-       if (this_use_dac < 0)
-               this_use_dac = tp->pcie_cap != 0;
-
        if ((sizeof(dma_addr_t) > 4) &&
-           this_use_dac &&
-           !pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
-               netif_info(tp, probe, dev, "using 64-bit DMA\n");
+           !pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) && use_dac) {
                tp->cp_cmd |= PCIDAC;
                dev->features |= NETIF_F_HIGHDMA;
        } else {
@@ -3085,6 +3079,10 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
                goto err_out_free_res_4;
        }
 
+       tp->pcie_cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+       if (!tp->pcie_cap)
+               netif_info(tp, probe, dev, "no PCI Express capability\n");
+
        RTL_W16(IntrMask, 0x0000);
 
        /* Soft reset the chip. */
@@ -3254,9 +3252,13 @@ static void __devexit rtl8169_remove_one(struct pci_dev *pdev)
 }
 
 static void rtl8169_set_rxbufsize(struct rtl8169_private *tp,
-                                 struct net_device *dev)
+                                 unsigned int mtu)
 {
-       unsigned int max_frame = dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
+       unsigned int max_frame = mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
+
+       if (max_frame != 16383)
+               printk(KERN_WARNING PFX "WARNING! Changing of MTU on this "
+                       "NIC may lead to frame reception errors!\n");
 
        tp->rx_buf_sz = (max_frame > RX_BUF_SIZE) ? max_frame : RX_BUF_SIZE;
 }
@@ -3269,7 +3271,17 @@ static int rtl8169_open(struct net_device *dev)
 
        pm_runtime_get_sync(&pdev->dev);
 
-       rtl8169_set_rxbufsize(tp, dev);
+       /*
+        * Note that we use a magic value here, its wierd I know
+        * its done because, some subset of rtl8169 hardware suffers from
+        * a problem in which frames received that are longer than
+        * the size set in RxMaxSize register return garbage sizes
+        * when received.  To avoid this we need to turn off filtering,
+        * which is done by setting a value of 16383 in the RxMaxSize register
+        * and allocating 16k frames to handle the largest possible rx value
+        * thats what the magic math below does.
+        */
+       rtl8169_set_rxbufsize(tp, 16383 - VLAN_ETH_HLEN - ETH_FCS_LEN);
 
        /*
         * Rx and Tx desscriptors needs 256 bytes alignment.
@@ -3929,7 +3941,7 @@ static int rtl8169_change_mtu(struct net_device *dev, int new_mtu)
 
        rtl8169_down(dev);
 
-       rtl8169_set_rxbufsize(tp, dev);
+       rtl8169_set_rxbufsize(tp, dev->mtu);
 
        ret = rtl8169_init_ring(dev);
        if (ret < 0)
@@ -4808,8 +4820,8 @@ static void rtl_set_rx_mode(struct net_device *dev)
                mc_filter[1] = swab32(data);
        }
 
-       RTL_W32(MAR0 + 0, mc_filter[0]);
        RTL_W32(MAR0 + 4, mc_filter[1]);
+       RTL_W32(MAR0 + 0, mc_filter[0]);
 
        RTL_W32(RxConfig, tmp);