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authorStephen Hemminger <shemminger@osdl.org>2006-03-07 11:06:36 -0800
committerFrancois Romieu <romieu@fr.zoreil.com>2006-03-09 23:19:02 +0100
commitb19666d92009ad2aa8e12d25f2cab59fb32421eb (patch)
treef2217c5d18df21eb87d8f3571b105598f86e6314
parent28a31860191c0d5710d42f85510daac0a3c26a01 (diff)
downloadlinux-stericsson-b19666d92009ad2aa8e12d25f2cab59fb32421eb.tar.gz
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>
-rw-r--r--drivers/net/sky2.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index dc4feaf79be2..1078b7cab076 100644
--- 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);