netdev - [PATCH 3/3] skge: add byte queue limit support

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Message-ID: <20120122114040.1b175e4c@nehalam.linuxnetplumber.net>
Date:	Sun, 22 Jan 2012 11:40:40 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: [PATCH 3/3] skge: add byte queue limit support

This also changes the cleanup logic slightly to aggregate
completed notifications for multiple packets.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
---
v2 - change location of netdev_sent_queue to avoid race

--- a/drivers/net/ethernet/marvell/skge.c	2012-01-19 16:12:19.000000000 -0800
+++ b/drivers/net/ethernet/marvell/skge.c	2012-01-20 10:18:25.988415244 -0800
@@ -2817,6 +2817,8 @@ static netdev_tx_t skge_xmit_frame(struc
 	td->control = BMU_OWN | BMU_SW | BMU_STF | control | len;
 	wmb();
 
+	netdev_sent_queue(dev, skb->len);
+
 	skge_write8(hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_START);
 
 	netif_printk(skge, tx_queued, KERN_DEBUG, skge->netdev,
@@ -2858,11 +2860,9 @@ mapping_error:
 
 
 /* Free resources associated with this reing element */
-static void skge_tx_free(struct skge_port *skge, struct skge_element *e,
-			 u32 control)
+static inline void skge_tx_unmap(struct pci_dev *pdev, struct skge_element *e,
+				 u32 control)
 {
-	struct pci_dev *pdev = skge->hw->pdev;
-
 	/* skb header vs. fragment */
 	if (control & BMU_STF)
 		pci_unmap_single(pdev, dma_unmap_addr(e, mapaddr),
@@ -2872,13 +2872,6 @@ static void skge_tx_free(struct skge_por
 		pci_unmap_page(pdev, dma_unmap_addr(e, mapaddr),
 			       dma_unmap_len(e, maplen),
 			       PCI_DMA_TODEVICE);
-
-	if (control & BMU_EOF) {
-		netif_printk(skge, tx_done, KERN_DEBUG, skge->netdev,
-			     "tx done slot %td\n", e - skge->tx_ring.start);
-
-		dev_kfree_skb(e->skb);
-	}
 }
 
 /* Free all buffers in transmit ring */
@@ -2889,10 +2882,15 @@ static void skge_tx_clean(struct net_dev
 
 	for (e = skge->tx_ring.to_clean; e != skge->tx_ring.to_use; e = e->next) {
 		struct skge_tx_desc *td = e->desc;
-		skge_tx_free(skge, e, td->control);
+
+		skge_tx_unmap(skge->hw->pdev, e, td->control);
+
+		if (td->control & BMU_EOF)
+			dev_kfree_skb(e->skb);
 		td->control = 0;
 	}
 
+	netdev_reset_queue(dev);
 	skge->tx_ring.to_clean = e;
 }
 
@@ -3157,6 +3155,7 @@ static void skge_tx_done(struct net_devi
 	struct skge_port *skge = netdev_priv(dev);
 	struct skge_ring *ring = &skge->tx_ring;
 	struct skge_element *e;
+	unsigned int bytes_compl = 0, pkts_compl = 0;
 
 	skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
 
@@ -3166,8 +3165,20 @@ static void skge_tx_done(struct net_devi
 		if (control & BMU_OWN)
 			break;
 
-		skge_tx_free(skge, e, control);
+		skge_tx_unmap(skge->hw->pdev, e, control);
+
+		if (control & BMU_EOF) {
+			netif_printk(skge, tx_done, KERN_DEBUG, skge->netdev,
+				     "tx done slot %td\n",
+				     e - skge->tx_ring.start);
+
+			pkts_compl++;
+			bytes_compl += e->skb->len;
+
+			dev_kfree_skb(e->skb);
+		}
 	}
+	netdev_completed_queue(dev, pkts_compl, bytes_compl);
 	skge->tx_ring.to_clean = e;
 
 	/* Can run lockless until we need to synchronize to restart queue. */
--
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