sky2: force early transmit interrupts

Avoid premature transmit ring full conditions.
Force a transmit status interrupt if transmit ring gets nearly full
and after a TSO send.

Allow more entries in transmit ring to be used if dma_addr is 32 bits

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index dc4feaf79be2b4b165a7a76d28923046c6b843a2..1078b7cab076977f3908314897713f83b7a8ede3 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -74,7 +74,7 @@
 #define TX_RING_SIZE           512
 #define TX_DEF_PENDING         (TX_RING_SIZE - 1)
 #define TX_MIN_PENDING         64
-#define MAX_SKB_TX_LE          (4 + 2*MAX_SKB_FRAGS)
+#define MAX_SKB_TX_LE          (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
 
 #define STATUS_RING_SIZE       2048    /* 2 ports * (TX + 2*RX) */
 #define STATUS_LE_BYTES                (STATUS_RING_SIZE*sizeof(struct sky2_status_le))
@@ -1145,6 +1145,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
        struct sky2_tx_le *le = NULL;
        struct tx_ring_info *re;
        unsigned i, len;
+       int avail;
        dma_addr_t mapping;
        u32 addr64;
        u16 mss;
@@ -1287,12 +1288,16 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
        re->idx = sky2->tx_prod;
        le->ctrl |= EOP;
 
+       avail = tx_avail(sky2);
+       if (mss != 0 || avail < TX_MIN_PENDING) {
+               le->ctrl |= FRC_STAT;
+               if (avail <= MAX_SKB_TX_LE)
+                       netif_stop_queue(dev);
+       }
+
        sky2_put_idx(hw, txqaddr[sky2->port], sky2->tx_prod,
                     &sky2->tx_last_put, TX_RING_SIZE);
 
-       if (tx_avail(sky2) <= MAX_SKB_TX_LE)
-               netif_stop_queue(dev);
-
 out_unlock:
        spin_unlock(&sky2->tx_lock);