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

1 files changed, 47 insertions, 61 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 7599f52e15b3..81f4aedf534c 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -67,8 +67,8 @@
 
 #define DRV_MODULE_NAME		"tg3"
 #define PFX DRV_MODULE_NAME	": "
-#define DRV_MODULE_VERSION	"3.39"
-#define DRV_MODULE_RELDATE	"September 5, 2005"
+#define DRV_MODULE_VERSION	"3.40"
+#define DRV_MODULE_RELDATE	"September 15, 2005"
 
 #define TG3_DEF_MAC_MODE	0
 #define TG3_DEF_RX_MODE		0
@@ -3442,31 +3442,47 @@ static void tg3_tx_timeout(struct net_device *dev)
 	schedule_work(&tp->reset_task);
 }
 
+/* Test for DMA buffers crossing any 4GB boundaries: 4G, 8G, etc */
+static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
+{
+	u32 base = (u32) mapping & 0xffffffff;
+
+	return ((base > 0xffffdcc0) &&
+		(base + len + 8 < base));
+}
+
 static void tg3_set_txd(struct tg3 *, int, dma_addr_t, int, u32, u32);
 
 static int tigon3_4gb_hwbug_workaround(struct tg3 *tp, struct sk_buff *skb,
-				       u32 guilty_entry, int guilty_len,
-				       u32 last_plus_one, u32 *start, u32 mss)
+				       u32 last_plus_one, u32 *start,
+				       u32 base_flags, u32 mss)
 {
 	struct sk_buff *new_skb = skb_copy(skb, GFP_ATOMIC);
-	dma_addr_t new_addr;
+	dma_addr_t new_addr = 0;
 	u32 entry = *start;
-	int i;
+	int i, ret = 0;
 
 	if (!new_skb) {
-		dev_kfree_skb(skb);
-		return -1;
+		ret = -1;
+	} else {
+		/* New SKB is guaranteed to be linear. */
+		entry = *start;
+		new_addr = pci_map_single(tp->pdev, new_skb->data, new_skb->len,
+					  PCI_DMA_TODEVICE);
+		/* Make sure new skb does not cross any 4G boundaries.
+		 * Drop the packet if it does.
+		 */
+		if (tg3_4g_overflow_test(new_addr, new_skb->len)) {
+			ret = -1;
+			dev_kfree_skb(new_skb);
+			new_skb = NULL;
+		} else {
+			tg3_set_txd(tp, entry, new_addr, new_skb->len,
+				    base_flags, 1 | (mss << 1));
+			*start = NEXT_TX(entry);
+		}
 	}
 
-	/* New SKB is guaranteed to be linear. */
-	entry = *start;
-	new_addr = pci_map_single(tp->pdev, new_skb->data, new_skb->len,
-				  PCI_DMA_TODEVICE);
-	tg3_set_txd(tp, entry, new_addr, new_skb->len,
-		    (skb->ip_summed == CHECKSUM_HW) ?
-		    TXD_FLAG_TCPUDP_CSUM : 0, 1 | (mss << 1));
-	*start = NEXT_TX(entry);
-
 	/* Now clean up the sw ring entries. */
 	i = 0;
 	while (entry != last_plus_one) {
@@ -3491,7 +3507,7 @@ static int tigon3_4gb_hwbug_workaround(struct tg3 *tp, struct sk_buff *skb,
 
 	dev_kfree_skb(skb);
 
-	return 0;
+	return ret;
 }
 
 static void tg3_set_txd(struct tg3 *tp, int entry,
@@ -3517,19 +3533,10 @@ static void tg3_set_txd(struct tg3 *tp, int entry,
 	txd->vlan_tag = vlan_tag << TXD_VLAN_TAG_SHIFT;
 }
 
-static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
-{
-	u32 base = (u32) mapping & 0xffffffff;
-
-	return ((base > 0xffffdcc0) &&
-		(base + len + 8 < base));
-}
-
 static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct tg3 *tp = netdev_priv(dev);
 	dma_addr_t mapping;
-	unsigned int i;
 	u32 len, entry, base_flags, mss;
 	int would_hit_hwbug;
 
@@ -3624,7 +3631,7 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	would_hit_hwbug = 0;
 
 	if (tg3_4g_overflow_test(mapping, len))
-		would_hit_hwbug = entry + 1;
+		would_hit_hwbug = 1;
 
 	tg3_set_txd(tp, entry, mapping, len, base_flags,
 		    (skb_shinfo(skb)->nr_frags == 0) | (mss << 1));
@@ -3648,12 +3655,8 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 			tp->tx_buffers[entry].skb = NULL;
 			pci_unmap_addr_set(&tp->tx_buffers[entry], mapping, mapping);
 
-			if (tg3_4g_overflow_test(mapping, len)) {
-				/* Only one should match. */
-				if (would_hit_hwbug)
-					BUG();
-				would_hit_hwbug = entry + 1;
-			}
+			if (tg3_4g_overflow_test(mapping, len))
+				would_hit_hwbug = 1;
 
 			if (tp->tg3_flags2 & TG3_FLG2_HW_TSO)
 				tg3_set_txd(tp, entry, mapping, len,
@@ -3669,34 +3672,15 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (would_hit_hwbug) {
 		u32 last_plus_one = entry;
 		u32 start;
-		unsigned int len = 0;
-
-		would_hit_hwbug -= 1;
-		entry = entry - 1 - skb_shinfo(skb)->nr_frags;
-		entry &= (TG3_TX_RING_SIZE - 1);
-		start = entry;
-		i = 0;
-		while (entry != last_plus_one) {
-			if (i == 0)
-				len = skb_headlen(skb);
-			else
-				len = skb_shinfo(skb)->frags[i-1].size;
 
-			if (entry == would_hit_hwbug)
-				break;
-
-			i++;
-			entry = NEXT_TX(entry);
-
-		}
+		start = entry - 1 - skb_shinfo(skb)->nr_frags;
+		start &= (TG3_TX_RING_SIZE - 1);
 
 		/* If the workaround fails due to memory/mapping
 		 * failure, silently drop this packet.
 		 */
-		if (tigon3_4gb_hwbug_workaround(tp, skb,
-						entry, len,
-						last_plus_one,
-						&start, mss))
+		if (tigon3_4gb_hwbug_workaround(tp, skb, last_plus_one,
+						&start, base_flags, mss))
 			goto out_unlock;
 
 		entry = start;
@@ -9271,6 +9255,8 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
 	static struct pci_device_id write_reorder_chipsets[] = {
 		{ PCI_DEVICE(PCI_VENDOR_ID_AMD,
 		             PCI_DEVICE_ID_AMD_FE_GATE_700C) },
+		{ PCI_DEVICE(PCI_VENDOR_ID_AMD,
+		             PCI_DEVICE_ID_AMD_K8_NB) },
 		{ },
 	};
 	u32 misc_ctrl_reg;
@@ -9285,7 +9271,7 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
 		tp->tg3_flags2 |= TG3_FLG2_SUN_570X;
 #endif
 
-	/* If we have an AMD 762 chipset, write
+	/* If we have an AMD 762 or K8 chipset, write
 	 * reordering to the mailbox registers done by the host
 	 * controller can cause major troubles.  We read back from
 	 * every mailbox register write to force the writes to be
@@ -9532,7 +9518,7 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
 		tp->write32_rx_mbox = tg3_write_indirect_mbox;
 
 		iounmap(tp->regs);
-		tp->regs = 0;
+		tp->regs = NULL;
 
 		pci_read_config_word(tp->pdev, PCI_COMMAND, &pci_cmd);
 		pci_cmd &= ~PCI_COMMAND_MEMORY;
@@ -10680,7 +10666,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 err_out_iounmap:
 	if (tp->regs) {
 		iounmap(tp->regs);
-		tp->regs = 0;
+		tp->regs = NULL;
 	}
 
 err_out_free_dev:
@@ -10705,7 +10691,7 @@ static void __devexit tg3_remove_one(struct pci_dev *pdev)
 		unregister_netdev(dev);
 		if (tp->regs) {
 			iounmap(tp->regs);
-			tp->regs = 0;
+			tp->regs = NULL;
 		}
 		free_netdev(dev);
 		pci_release_regions(pdev);