X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Fnet%2Fgianfar.c;h=99a4b990939f7720780e02da49d822dbdf2b9abd;hb=b57ab7632b8fc1eef139bbbb7a89002be61f99e1;hp=601f93e482c6ddf8ca8fc7f97fdc3337f7a8dba5;hpb=2f4489112896770d66dc2960f71174d69ee23004;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 601f93e482c..99a4b990939 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -98,7 +98,6 @@
 #include "gianfar_mii.h"
 
 #define TX_TIMEOUT      (1*HZ)
-#define SKB_ALLOC_TIMEOUT 1000000
 #undef BRIEF_GFAR_ERRORS
 #undef VERBOSE_GFAR_ERRORS
 
@@ -115,7 +114,9 @@ static int gfar_enet_open(struct net_device *dev);
 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev);
 static void gfar_timeout(struct net_device *dev);
 static int gfar_close(struct net_device *dev);
-struct sk_buff *gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp);
+struct sk_buff *gfar_new_skb(struct net_device *dev);
+static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
+		struct sk_buff *skb);
 static int gfar_set_mac_address(struct net_device *dev);
 static int gfar_change_mtu(struct net_device *dev, int new_mtu);
 static irqreturn_t gfar_error(int irq, void *dev_id);
@@ -783,14 +784,21 @@ int startup_gfar(struct net_device *dev)
 
 	rxbdp = priv->rx_bd_base;
 	for (i = 0; i < priv->rx_ring_size; i++) {
-		struct sk_buff *skb = NULL;
+		struct sk_buff *skb;
 
-		rxbdp->status = 0;
+		skb = gfar_new_skb(dev);
 
-		skb = gfar_new_skb(dev, rxbdp);
+		if (!skb) {
+			printk(KERN_ERR "%s: Can't allocate RX buffers\n",
+					dev->name);
+
+			goto err_rxalloc_fail;
+		}
 
 		priv->rx_skbuff[i] = skb;
 
+		gfar_new_rxbdp(dev, rxbdp, skb);
+
 		rxbdp++;
 	}
 
@@ -916,6 +924,7 @@ rx_irq_fail:
 tx_irq_fail:
 	free_irq(priv->interruptError, dev);
 err_irq_fail:
+err_rxalloc_fail:	
 rx_skb_fail:
 	free_skb_resources(priv);
 tx_skb_fail:
@@ -1250,17 +1259,12 @@ static void gfar_timeout(struct net_device *dev)
 }
 
 /* Interrupt Handler for Transmit complete */
-static irqreturn_t gfar_transmit(int irq, void *dev_id)
+int gfar_clean_tx_ring(struct net_device *dev)
 {
-	struct net_device *dev = (struct net_device *) dev_id;
-	struct gfar_private *priv = netdev_priv(dev);
 	struct txbd8 *bdp;
+	struct gfar_private *priv = netdev_priv(dev);
+	int howmany = 0;
 
-	/* Clear IEVENT */
-	gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
-
-	/* Lock priv */
-	spin_lock(&priv->txlock);
 	bdp = priv->dirty_tx;
 	while ((bdp->status & TXBD_READY) == 0) {
 		/* If dirty_tx and cur_tx are the same, then either the */
@@ -1269,7 +1273,7 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
 		if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
 			break;
 
-		dev->stats.tx_packets++;
+		howmany++;
 
 		/* Deferred means some collisions occurred during transmit, */
 		/* but we eventually sent the packet. */
@@ -1278,11 +1282,15 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
 
 		/* Free the sk buffer associated with this TxBD */
 		dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
+
 		priv->tx_skbuff[priv->skb_dirtytx] = NULL;
 		priv->skb_dirtytx =
 		    (priv->skb_dirtytx +
 		     1) & TX_RING_MOD_MASK(priv->tx_ring_size);
 
+		/* Clean BD length for empty detection */
+		bdp->length = 0;
+
 		/* update bdp to point at next bd in the ring (wrapping if necessary) */
 		if (bdp->status & TXBD_WRAP)
 			bdp = priv->tx_bd_base;
@@ -1297,6 +1305,25 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
 			netif_wake_queue(dev);
 	} /* while ((bdp->status & TXBD_READY) == 0) */
 
+	dev->stats.tx_packets += howmany;
+
+	return howmany;
+}
+
+/* Interrupt Handler for Transmit complete */
+static irqreturn_t gfar_transmit(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Clear IEVENT */
+	gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
+
+	/* Lock priv */
+	spin_lock(&priv->txlock);
+
+	gfar_clean_tx_ring(dev);
+
 	/* If we are coalescing the interrupts, reset the timer */
 	/* Otherwise, clear it */
 	if (likely(priv->txcoalescing)) {
@@ -1310,18 +1337,37 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-struct sk_buff * gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp)
+static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
+		struct sk_buff *skb)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	u32 * status_len = (u32 *)bdp;
+	u16 flags;
+
+	bdp->bufPtr = dma_map_single(&dev->dev, skb->data,
+			priv->rx_buffer_size, DMA_FROM_DEVICE);
+
+	flags = RXBD_EMPTY | RXBD_INTERRUPT;
+
+	if (bdp == priv->rx_bd_base + priv->rx_ring_size - 1)
+		flags |= RXBD_WRAP;
+
+	eieio();
+
+	*status_len = (u32)flags << 16;
+}
+
+
+struct sk_buff * gfar_new_skb(struct net_device *dev)
 {
 	unsigned int alignamount;
 	struct gfar_private *priv = netdev_priv(dev);
 	struct sk_buff *skb = NULL;
-	unsigned int timeout = SKB_ALLOC_TIMEOUT;
 
 	/* We have to allocate the skb, so keep trying till we succeed */
-	while ((!skb) && timeout--)
-		skb = dev_alloc_skb(priv->rx_buffer_size + RXBUF_ALIGNMENT);
+	skb = netdev_alloc_skb(dev, priv->rx_buffer_size + RXBUF_ALIGNMENT);
 
-	if (NULL == skb)
+	if (!skb)
 		return NULL;
 
 	alignamount = RXBUF_ALIGNMENT -
@@ -1332,15 +1378,6 @@ struct sk_buff * gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp)
 	 */
 	skb_reserve(skb, alignamount);
 
-	bdp->bufPtr = dma_map_single(&dev->dev, skb->data,
-			priv->rx_buffer_size, DMA_FROM_DEVICE);
-
-	bdp->length = 0;
-
-	/* Mark the buffer empty */
-	eieio();
-	bdp->status |= (RXBD_EMPTY | RXBD_INTERRUPT);
-
 	return skb;
 }
 
@@ -1392,15 +1429,15 @@ irqreturn_t gfar_receive(int irq, void *dev_id)
 	unsigned long flags;
 #endif
 
-	/* Clear IEVENT, so rx interrupt isn't called again
-	 * because of this interrupt */
-	gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
-
 	/* support NAPI */
 #ifdef CONFIG_GFAR_NAPI
+	/* Clear IEVENT, so interrupts aren't called again
+	 * because of the packets that have already arrived */
+	gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
+
 	if (netif_rx_schedule_prep(dev, &priv->napi)) {
 		tempval = gfar_read(&priv->regs->imask);
-		tempval &= IMASK_RX_DISABLED;
+		tempval &= IMASK_RTX_DISABLED;
 		gfar_write(&priv->regs->imask, tempval);
 
 		__netif_rx_schedule(dev, &priv->napi);
@@ -1411,6 +1448,9 @@ irqreturn_t gfar_receive(int irq, void *dev_id)
 				gfar_read(&priv->regs->imask));
 	}
 #else
+	/* Clear IEVENT, so rx interrupt isn't called again
+	 * because of this interrupt */
+	gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
 
 	spin_lock_irqsave(&priv->rxlock, flags);
 	gfar_clean_rx_ring(dev, priv->rx_ring_size);
@@ -1523,10 +1563,31 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
 	bdp = priv->cur_rx;
 
 	while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
+		struct sk_buff *newskb;
 		rmb();
+
+		/* Add another skb for the future */
+		newskb = gfar_new_skb(dev);
+
 		skb = priv->rx_skbuff[priv->skb_currx];
 
-		if ((bdp->status & RXBD_LAST) && !(bdp->status & RXBD_ERR)) {
+		/* We drop the frame if we failed to allocate a new buffer */
+		if (unlikely(!newskb || !(bdp->status & RXBD_LAST) ||
+				 bdp->status & RXBD_ERR)) {
+			count_errors(bdp->status, dev);
+
+			if (unlikely(!newskb))
+				newskb = skb;
+
+			if (skb) {
+				dma_unmap_single(&priv->dev->dev,
+						bdp->bufPtr,
+						priv->rx_buffer_size,
+						DMA_FROM_DEVICE);
+
+				dev_kfree_skb_any(skb);
+			}
+		} else {
 			/* Increment the number of packets */
 			dev->stats.rx_packets++;
 			howmany++;
@@ -1537,23 +1598,14 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
 			gfar_process_frame(dev, skb, pkt_len);
 
 			dev->stats.rx_bytes += pkt_len;
-		} else {
-			count_errors(bdp->status, dev);
-
-			if (skb)
-				dev_kfree_skb_any(skb);
-
-			priv->rx_skbuff[priv->skb_currx] = NULL;
 		}
 
 		dev->last_rx = jiffies;
 
-		/* Clear the status flags for this buffer */
-		bdp->status &= ~RXBD_STATS;
+		priv->rx_skbuff[priv->skb_currx] = newskb;
 
-		/* Add another skb for the future */
-		skb = gfar_new_skb(dev, bdp);
-		priv->rx_skbuff[priv->skb_currx] = skb;
+		/* Setup the new bdp */
+		gfar_new_rxbdp(dev, bdp, newskb);
 
 		/* Update to the next pointer */
 		if (bdp->status & RXBD_WRAP)
@@ -1563,9 +1615,8 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
 
 		/* update to point at the next skb */
 		priv->skb_currx =
-		    (priv->skb_currx +
-		     1) & RX_RING_MOD_MASK(priv->rx_ring_size);
-
+		    (priv->skb_currx + 1) &
+		    RX_RING_MOD_MASK(priv->rx_ring_size);
 	}
 
 	/* Update the current rxbd pointer to be the next one */
@@ -1580,6 +1631,13 @@ static int gfar_poll(struct napi_struct *napi, int budget)
 	struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
 	struct net_device *dev = priv->dev;
 	int howmany;
+	unsigned long flags;
+
+	/* If we fail to get the lock, don't bother with the TX BDs */
+	if (spin_trylock_irqsave(&priv->txlock, flags)) {
+		gfar_clean_tx_ring(dev);
+		spin_unlock_irqrestore(&priv->txlock, flags);
+	}
 
 	howmany = gfar_clean_rx_ring(dev, budget);
 
@@ -1973,12 +2031,16 @@ static irqreturn_t gfar_error(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:fsl-gianfar");
+
 /* Structure for a device driver */
 static struct platform_driver gfar_driver = {
 	.probe = gfar_probe,
 	.remove = gfar_remove,
 	.driver	= {
 		.name = "fsl-gianfar",
+		.owner = THIS_MODULE,
 	},
 };