net/macb: move to circ_buf macros and fix initial condition

Move to circular buffers management macro and correct an error
with circular buffer initial condition.

Without this patch, the macb_tx_ring_avail() function was
not reporting the proper ring availability at startup:
macb macb: eth0: BUG! Tx Ring full when queue awake!
macb macb: eth0: tx_head = 0, tx_tail = 0
And hanginig forever...

I remove the macb_tx_ring_avail() function and use the
proven macros from circ_buf.h. CIRC_CNT() is used in the
"consumer" part of the driver: macb_tx_interrupt() to match
advice from Documentation/circular-buffers.txt.

Reported-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Tested-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 10 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index edb2aba9045c..27991ddb6ff0 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -14,6 +14,7 @@
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
+#include <linux/circ_buf.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/gpio.h>
@@ -38,8 +39,8 @@
 #define TX_RING_SIZE            128 /* must be power of 2 */
 #define TX_RING_BYTES           (sizeof(struct macb_dma_desc) * TX_RING_SIZE)
 
-/* minimum number of free TX descriptors before waking up TX process */
-#define MACB_TX_WAKEUP_THRESH   (TX_RING_SIZE / 4)
+/* level of occupied TX descriptors under which we wake up TX process */
+#define MACB_TX_WAKEUP_THRESH   (3 * TX_RING_SIZE / 4)
 
 #define MACB_RX_INT_FLAGS       (MACB_BIT(RCOMP) | MACB_BIT(RXUBR)      \
                                  | MACB_BIT(ISR_ROVR))
@@ -60,11 +61,6 @@ static unsigned int macb_tx_ring_wrap(unsigned int index)
         return index & (TX_RING_SIZE - 1);
 }
 
-static unsigned int macb_tx_ring_avail(struct macb *bp)
-{
-        return (bp->tx_tail - bp->tx_head) & (TX_RING_SIZE - 1);
-}
-
 static struct macb_dma_desc *macb_tx_desc(struct macb *bp, unsigned int index)
 {
         return &bp->tx_ring[macb_tx_ring_wrap(index)];
@@ -524,7 +520,8 @@ static void macb_tx_interrupt(struct macb *bp)
 
         bp->tx_tail = tail;
         if (netif_queue_stopped(bp->dev)
-                        && macb_tx_ring_avail(bp) > MACB_TX_WAKEUP_THRESH)
+                        && CIRC_CNT(bp->tx_head, bp->tx_tail,
+                                    TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH)
                 netif_wake_queue(bp->dev);
 }
 
@@ -818,7 +815,7 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
         spin_lock_irqsave(&bp->lock, flags);
 
         /* This is a hard error, log it. */
-        if (macb_tx_ring_avail(bp) < 1) {
+        if (CIRC_SPACE(bp->tx_head, bp->tx_tail, TX_RING_SIZE) < 1) {
                 netif_stop_queue(dev);
                 spin_unlock_irqrestore(&bp->lock, flags);
                 netdev_err(bp->dev, "BUG! Tx Ring full when queue awake!\n");
@@ -855,7 +852,7 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
         macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
 
-        if (macb_tx_ring_avail(bp) < 1)
+        if (CIRC_SPACE(bp->tx_head, bp->tx_tail, TX_RING_SIZE) < 1)
                 netif_stop_queue(dev);
 
         spin_unlock_irqrestore(&bp->lock, flags);