mv643xx_eth: various cleanups

- Remove unused MV643XX_DEFAULT_[RT]X_QUEUE_SIZE definitions.
- Remove ETH_TARGET enum -- it isn't used anywhere in the driver,
  and isn't even valid for non-mv643xx chip models, as those use
  different MBUS target IDs.
- Clean up comment and control flow in mv643xx_eth_change_mtu().
- Use mp->dev instead of mp->mii.dev in mv643xx_eth_tx_timeout_task().
- Make mv643xx_eth_free_tx_descs() static.
- Remove overzealous NULL check in mv643xx_eth_start_xmit().
- Use symbolic NETDEV_TX_* constants in mv643xx_eth_start_xmit().

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Reviewed-by: Tzachi Perelstein <tzachi@marvell.com>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>

1 files changed, 16 insertions, 39 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 06e024f5d68b..b66d62768077 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -63,20 +63,6 @@
 #define MV643XX_TX_FAST_REFILL
 #undef  MV643XX_COAL
 
-/*
- * Number of RX / TX descriptors on RX / TX rings.
- * Note that allocating RX descriptors is done by allocating the RX
- * ring AND a preallocated RX buffers (skb's) for each descriptor.
- * The TX descriptors only allocates the TX descriptors ring,
- * with no pre allocated TX buffers (skb's are allocated by higher layers.
- */
-
-/* Default TX ring size is 1000 descriptors */
-#define MV643XX_DEFAULT_TX_QUEUE_SIZE 1000
-
-/* Default RX ring size is 400 descriptors */
-#define MV643XX_DEFAULT_RX_QUEUE_SIZE 400
-
 #define MV643XX_TX_COAL 100
 #ifdef MV643XX_COAL
 #define MV643XX_RX_COAL 100
@@ -434,14 +420,6 @@ typedef enum _eth_func_ret_status {
         ETH_QUEUE_LAST_RESOURCE /* Ring resources about to exhaust.     */
 } ETH_FUNC_RET_STATUS;
 
-typedef enum _eth_target {
-        ETH_TARGET_DRAM,
-        ETH_TARGET_DEVICE,
-        ETH_TARGET_CBS,
-        ETH_TARGET_PCI0,
-        ETH_TARGET_PCI1
-} ETH_TARGET;
-
 /* These are for big-endian machines.  Little endian needs different
  * definitions.
  */
@@ -615,7 +593,6 @@ static unsigned int mv643xx_eth_port_disable_tx(unsigned int port_num);
 static unsigned int mv643xx_eth_port_disable_rx(unsigned int port_num);
 static int mv643xx_eth_open(struct net_device *);
 static int mv643xx_eth_stop(struct net_device *);
-static int mv643xx_eth_change_mtu(struct net_device *, int);
 static void eth_port_init_mac_tables(unsigned int eth_port_num);
 #ifdef MV643XX_NAPI
 static int mv643xx_poll(struct napi_struct *napi, int budget);
@@ -659,18 +636,19 @@ static int mv643xx_eth_change_mtu(struct net_device *dev, int new_mtu)
                 return -EINVAL;
 
         dev->mtu = new_mtu;
+        if (!netif_running(dev))
+                return 0;
+
         /*
-         * Stop then re-open the interface. This will allocate RX skb's with
-         * the new MTU.
-         * There is a possible danger that the open will not successed, due
-         * to memory is full, which might fail the open function.
+         * Stop and then re-open the interface. This will allocate RX
+         * skbs of the new MTU.
+         * There is a possible danger that the open will not succeed,
+         * due to memory being full, which might fail the open function.
          */
-        if (netif_running(dev)) {
-                mv643xx_eth_stop(dev);
-                if (mv643xx_eth_open(dev))
-                        printk(KERN_ERR
-                                "%s: Fatal error on opening device\n",
-                                dev->name);
+        mv643xx_eth_stop(dev);
+        if (mv643xx_eth_open(dev)) {
+                printk(KERN_ERR "%s: Fatal error on opening device\n",
+                        dev->name);
         }
 
         return 0;
@@ -826,7 +804,7 @@ static void mv643xx_eth_tx_timeout_task(struct work_struct *ugly)
 {
         struct mv643xx_private *mp = container_of(ugly, struct mv643xx_private,
                                                   tx_timeout_task);
-        struct net_device *dev = mp->mii.dev; /* yuck */
+        struct net_device *dev = mp->dev;
 
         if (!netif_running(dev))
                 return;
@@ -845,7 +823,7 @@ static void mv643xx_eth_tx_timeout_task(struct work_struct *ugly)
  *
  * If force is non-zero, frees uncompleted descriptors as well
  */
-int mv643xx_eth_free_tx_descs(struct net_device *dev, int force)
+static int mv643xx_eth_free_tx_descs(struct net_device *dev, int force)
 {
         struct mv643xx_private *mp = netdev_priv(dev);
         struct eth_tx_desc *desc;
@@ -1739,13 +1717,12 @@ static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
         unsigned long flags;
 
         BUG_ON(netif_queue_stopped(dev));
-        BUG_ON(skb == NULL);
 
         if (has_tiny_unaligned_frags(skb) && __skb_linearize(skb)) {
                 stats->tx_dropped++;
                 printk(KERN_DEBUG "%s: failed to linearize tiny "
                                 "unaligned fragment\n", dev->name);
-                return 1;
+                return NETDEV_TX_BUSY;
         }
 
         spin_lock_irqsave(&mp->lock, flags);
@@ -1754,7 +1731,7 @@ static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 printk(KERN_ERR "%s: transmit with queue full\n", dev->name);
                 netif_stop_queue(dev);
                 spin_unlock_irqrestore(&mp->lock, flags);
-                return 1;
+                return NETDEV_TX_BUSY;
         }
 
         eth_tx_submit_descs_for_skb(mp, skb);
@@ -1767,7 +1744,7 @@ static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
         spin_unlock_irqrestore(&mp->lock, flags);
 
-        return 0;               /* success */
+        return NETDEV_TX_OK;
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER