1 files changed, 100 insertions, 64 deletions

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index c39344adecce..3682ec61e8a8 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -101,6 +101,7 @@
  *	0.46: 20 Oct 2005: Add irq optimization modes.
  *	0.47: 26 Oct 2005: Add phyaddr 0 in phy scan.
  *	0.48: 24 Dec 2005: Disable TSO, bugfix for pci_map_single
+ *	0.49: 10 Dec 2005: Fix tso for large buffers.
  *
  * Known bugs:
  * We suspect that on some hardware no TX done interrupts are generated.
@@ -112,7 +113,7 @@
  * DEV_NEED_TIMERIRQ will not harm you on sane hardware, only generating a few
  * superfluous timer interrupts from the nic.
  */
-#define FORCEDETH_VERSION		"0.48"
+#define FORCEDETH_VERSION		"0.49"
 #define DRV_NAME			"forcedeth"
 
 #include <linux/module.h>
@@ -349,6 +350,8 @@ typedef union _ring_type {
 #define NV_TX2_VALID		(1<<31)
 #define NV_TX2_TSO		(1<<28)
 #define NV_TX2_TSO_SHIFT	14
+#define NV_TX2_TSO_MAX_SHIFT	14
+#define NV_TX2_TSO_MAX_SIZE	(1<<NV_TX2_TSO_MAX_SHIFT)
 #define NV_TX2_CHECKSUM_L3	(1<<27)
 #define NV_TX2_CHECKSUM_L4	(1<<26)
 
@@ -408,15 +411,15 @@ typedef union _ring_type {
 #define NV_WATCHDOG_TIMEO	(5*HZ)
 
 #define RX_RING		128
-#define TX_RING		64
+#define TX_RING		256
 /* 
  * If your nic mysteriously hangs then try to reduce the limits
  * to 1/0: It might be required to set NV_TX_LASTPACKET in the
  * last valid ring entry. But this would be impossible to
  * implement - probably a disassembly error.
  */
-#define TX_LIMIT_STOP	63
-#define TX_LIMIT_START	62
+#define TX_LIMIT_STOP	255
+#define TX_LIMIT_START	254
 
 /* rx/tx mac addr + type + vlan + align + slack*/
 #define NV_RX_HEADERS		(64)
@@ -535,6 +538,7 @@ struct fe_priv {
 	unsigned int next_tx, nic_tx;
 	struct sk_buff *tx_skbuff[TX_RING];
 	dma_addr_t tx_dma[TX_RING];
+	unsigned int tx_dma_len[TX_RING];
 	u32 tx_flags;
 };
 
@@ -935,6 +939,7 @@ static void nv_init_tx(struct net_device *dev)
 	        else
 			np->tx_ring.ex[i].FlagLen = 0;
 		np->tx_skbuff[i] = NULL;
+		np->tx_dma[i] = 0;
 	}
 }
 
@@ -945,30 +950,27 @@ static int nv_init_ring(struct net_device *dev)
 	return nv_alloc_rx(dev);
 }
 
-static void nv_release_txskb(struct net_device *dev, unsigned int skbnr)
+static int nv_release_txskb(struct net_device *dev, unsigned int skbnr)
 {
 	struct fe_priv *np = netdev_priv(dev);
-	struct sk_buff *skb = np->tx_skbuff[skbnr];
-	unsigned int j, entry, fragments;
-			
-	dprintk(KERN_INFO "%s: nv_release_txskb for skbnr %d, skb %p\n",
-		dev->name, skbnr, np->tx_skbuff[skbnr]);
-	
-	entry = skbnr;
-	if ((fragments = skb_shinfo(skb)->nr_frags) != 0) {
-		for (j = fragments; j >= 1; j--) {
-			skb_frag_t *frag = &skb_shinfo(skb)->frags[j-1];
-			pci_unmap_page(np->pci_dev, np->tx_dma[entry],
-				       frag->size,
-				       PCI_DMA_TODEVICE);
-			entry = (entry - 1) % TX_RING;
-		}
+
+	dprintk(KERN_INFO "%s: nv_release_txskb for skbnr %d\n",
+		dev->name, skbnr);
+
+	if (np->tx_dma[skbnr]) {
+		pci_unmap_page(np->pci_dev, np->tx_dma[skbnr],
+			       np->tx_dma_len[skbnr],
+			       PCI_DMA_TODEVICE);
+		np->tx_dma[skbnr] = 0;
+	}
+
+	if (np->tx_skbuff[skbnr]) {
+		dev_kfree_skb_irq(np->tx_skbuff[skbnr]);
+		np->tx_skbuff[skbnr] = NULL;
+		return 1;
+	} else {
+		return 0;
 	}
-	pci_unmap_single(np->pci_dev, np->tx_dma[entry],
-			 skb->len - skb->data_len,
-			 PCI_DMA_TODEVICE);
-	dev_kfree_skb_irq(skb);
-	np->tx_skbuff[skbnr] = NULL;
 }
 
 static void nv_drain_tx(struct net_device *dev)
@@ -981,10 +983,8 @@ static void nv_drain_tx(struct net_device *dev)
 			np->tx_ring.orig[i].FlagLen = 0;
 		else
 			np->tx_ring.ex[i].FlagLen = 0;
-		if (np->tx_skbuff[i]) {
-			nv_release_txskb(dev, i);
+		if (nv_release_txskb(dev, i))
 			np->stats.tx_dropped++;
-		}
 	}
 }
 
@@ -1021,68 +1021,105 @@ static void drain_ring(struct net_device *dev)
 static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct fe_priv *np = netdev_priv(dev);
+	u32 tx_flags = 0;
 	u32 tx_flags_extra = (np->desc_ver == DESC_VER_1 ? NV_TX_LASTPACKET : NV_TX2_LASTPACKET);
 	unsigned int fragments = skb_shinfo(skb)->nr_frags;
-	unsigned int nr = (np->next_tx + fragments) % TX_RING;
+	unsigned int nr = (np->next_tx - 1) % TX_RING;
+	unsigned int start_nr = np->next_tx % TX_RING;
 	unsigned int i;
+	u32 offset = 0;
+	u32 bcnt;
+	u32 size = skb->len-skb->data_len;
+	u32 entries = (size >> NV_TX2_TSO_MAX_SHIFT) + ((size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
+
+	/* add fragments to entries count */
+	for (i = 0; i < fragments; i++) {
+		entries += (skb_shinfo(skb)->frags[i].size >> NV_TX2_TSO_MAX_SHIFT) +
+			   ((skb_shinfo(skb)->frags[i].size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
+	}
 
 	spin_lock_irq(&np->lock);
 
-	if ((np->next_tx - np->nic_tx + fragments) > TX_LIMIT_STOP) {
+	if ((np->next_tx - np->nic_tx + entries - 1) > TX_LIMIT_STOP) {
 		spin_unlock_irq(&np->lock);
 		netif_stop_queue(dev);
 		return NETDEV_TX_BUSY;
 	}
 
-	np->tx_skbuff[nr] = skb;
-	
-	if (fragments) {
-		dprintk(KERN_DEBUG "%s: nv_start_xmit: buffer contains %d fragments\n", dev->name, fragments);
-		/* setup descriptors in reverse order */
-		for (i = fragments; i >= 1; i--) {
-			skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1];
-			np->tx_dma[nr] = pci_map_page(np->pci_dev, frag->page, frag->page_offset, frag->size,
-							PCI_DMA_TODEVICE);
+	/* setup the header buffer */
+	do {
+		bcnt = (size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : size;
+		nr = (nr + 1) % TX_RING;
+
+		np->tx_dma[nr] = pci_map_single(np->pci_dev, skb->data + offset, bcnt,
+						PCI_DMA_TODEVICE);
+		np->tx_dma_len[nr] = bcnt;
+
+		if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
+			np->tx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->tx_dma[nr]);
+			np->tx_ring.orig[nr].FlagLen = cpu_to_le32((bcnt-1) | tx_flags);
+		} else {
+			np->tx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->tx_dma[nr]) >> 32;
+			np->tx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->tx_dma[nr]) & 0x0FFFFFFFF;
+			np->tx_ring.ex[nr].FlagLen = cpu_to_le32((bcnt-1) | tx_flags);
+		}
+		tx_flags = np->tx_flags;
+		offset += bcnt;
+		size -= bcnt;
+	} while(size);
+
+	/* setup the fragments */
+	for (i = 0; i < fragments; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+		u32 size = frag->size;
+		offset = 0;
+
+		do {
+			bcnt = (size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : size;
+			nr = (nr + 1) % TX_RING;
+
+			np->tx_dma[nr] = pci_map_page(np->pci_dev, frag->page, frag->page_offset+offset, bcnt,
+						      PCI_DMA_TODEVICE);
+			np->tx_dma_len[nr] = bcnt;
 
 			if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
 				np->tx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->tx_dma[nr]);
-				np->tx_ring.orig[nr].FlagLen = cpu_to_le32( (frag->size-1) | np->tx_flags | tx_flags_extra);
+				np->tx_ring.orig[nr].FlagLen = cpu_to_le32((bcnt-1) | tx_flags);
 			} else {
 				np->tx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->tx_dma[nr]) >> 32;
 				np->tx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->tx_dma[nr]) & 0x0FFFFFFFF;
-				np->tx_ring.ex[nr].FlagLen = cpu_to_le32( (frag->size-1) | np->tx_flags | tx_flags_extra);
+				np->tx_ring.ex[nr].FlagLen = cpu_to_le32((bcnt-1) | tx_flags);
 			}
-			
-			nr = (nr - 1) % TX_RING;
+			offset += bcnt;
+			size -= bcnt;
+		} while (size);
+	}
 
-			if (np->desc_ver == DESC_VER_1)
-				tx_flags_extra &= ~NV_TX_LASTPACKET;
-			else
-				tx_flags_extra &= ~NV_TX2_LASTPACKET;		
-		}
+	/* set last fragment flag  */
+	if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
+		np->tx_ring.orig[nr].FlagLen |= cpu_to_le32(tx_flags_extra);
+	} else {
+		np->tx_ring.ex[nr].FlagLen |= cpu_to_le32(tx_flags_extra);
 	}
 
+	np->tx_skbuff[nr] = skb;
+
 #ifdef NETIF_F_TSO
 	if (skb_shinfo(skb)->tso_size)
-		tx_flags_extra |= NV_TX2_TSO | (skb_shinfo(skb)->tso_size << NV_TX2_TSO_SHIFT);
+		tx_flags_extra = NV_TX2_TSO | (skb_shinfo(skb)->tso_size << NV_TX2_TSO_SHIFT);
 	else
 #endif
-	tx_flags_extra |= (skb->ip_summed == CHECKSUM_HW ? (NV_TX2_CHECKSUM_L3|NV_TX2_CHECKSUM_L4) : 0);
+	tx_flags_extra = (skb->ip_summed == CHECKSUM_HW ? (NV_TX2_CHECKSUM_L3|NV_TX2_CHECKSUM_L4) : 0);
 
-	np->tx_dma[nr] = pci_map_single(np->pci_dev, skb->data, skb->len-skb->data_len,
-					PCI_DMA_TODEVICE);
-	
+	/* set tx flags */
 	if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
-		np->tx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->tx_dma[nr]);
-		np->tx_ring.orig[nr].FlagLen = cpu_to_le32( (skb->len-skb->data_len-1) | np->tx_flags | tx_flags_extra);
+		np->tx_ring.orig[start_nr].FlagLen |= cpu_to_le32(tx_flags | tx_flags_extra);
 	} else {
-		np->tx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->tx_dma[nr]) >> 32;
-		np->tx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->tx_dma[nr]) & 0x0FFFFFFFF;
-		np->tx_ring.ex[nr].FlagLen = cpu_to_le32( (skb->len-skb->data_len-1) | np->tx_flags | tx_flags_extra);
+		np->tx_ring.ex[start_nr].FlagLen |= cpu_to_le32(tx_flags | tx_flags_extra);
 	}	
 
-	dprintk(KERN_DEBUG "%s: nv_start_xmit: packet packet %d queued for transmission. tx_flags_extra: %x\n",
-				dev->name, np->next_tx, tx_flags_extra);
+	dprintk(KERN_DEBUG "%s: nv_start_xmit: packet %d (entries %d) queued for transmission. tx_flags_extra: %x\n",
+		dev->name, np->next_tx, entries, tx_flags_extra);
 	{
 		int j;
 		for (j=0; j<64; j++) {
@@ -1093,7 +1130,7 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		dprintk("\n");
 	}
 
-	np->next_tx += 1 + fragments;
+	np->next_tx += entries;
 
 	dev->trans_start = jiffies;
 	spin_unlock_irq(&np->lock);
@@ -1140,7 +1177,6 @@ static void nv_tx_done(struct net_device *dev)
 					np->stats.tx_packets++;
 					np->stats.tx_bytes += skb->len;
 				}
-				nv_release_txskb(dev, i);
 			}
 		} else {
 			if (Flags & NV_TX2_LASTPACKET) {
@@ -1156,9 +1192,9 @@ static void nv_tx_done(struct net_device *dev)
 					np->stats.tx_packets++;
 					np->stats.tx_bytes += skb->len;
 				}				
-				nv_release_txskb(dev, i);
 			}
 		}
+		nv_release_txskb(dev, i);
 		np->nic_tx++;
 	}
 	if (np->next_tx - np->nic_tx < TX_LIMIT_START)
@@ -2456,7 +2492,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 		np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
 		dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
 #ifdef NETIF_F_TSO
-		/* disabled dev->features |= NETIF_F_TSO; */
+		dev->features |= NETIF_F_TSO;
 #endif
  	}