[PATCH 5/9] sky2: force Tx interrupt when ring near full

[Stephen Hemminger]

Force a transmit status interrupt if transmit ring gets nearly full.

Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>

--- sky2-1.0.orig/drivers/net/sky2.c    2006-03-06 09:59:10.000000000 -0800
+++ sky2-1.0/drivers/net/sky2.c 2006-03-06 09:59:11.000000000 -0800
@@ -70,7 +70,7 @@
 #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))
@@ -1114,6 +1114,7 @@
        struct sky2_tx_le *le = NULL;
        struct tx_ring_info *re;
        unsigned i, len;
+       int avail;
        dma_addr_t mapping;
        u32 addr64;
        u16 mss;
@@ -1256,10 +1257,14 @@
        re->idx = sky2->tx_prod;
        le->ctrl |= EOP;
 
-       sky2_put_idx(hw, txqaddr[sky2->port], sky2->tx_prod);
+       avail = tx_avail(sky2);
+       if (avail < TX_MIN_PENDING) {
+               le->ctrl |= FRC_STAT;
+               if (avail <= MAX_SKB_TX_LE)
+                       netif_stop_queue(dev);
+       }
 
-       if (tx_avail(sky2) <= MAX_SKB_TX_LE)
-               netif_stop_queue(dev);
+       sky2_put_idx(hw, txqaddr[sky2->port], sky2->tx_prod);
 
 out_unlock:
        spin_unlock(&sky2->tx_lock);

--

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