[PATCH] sky2: transmit complete index optimization
Change transmit complete handling to use the status values
in the poll list because they are in-cache, rather than reading
non-cached memory for chips status.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 8dfd27d..ff6557d 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1274,7 +1274,7 @@
}
/* Cleanup all untransmitted buffers, assume transmitter not running */
-static inline void sky2_tx_clean(struct sky2_port *sky2)
+static void sky2_tx_clean(struct sky2_port *sky2)
{
sky2_tx_complete(sky2, sky2->tx_prod);
}
@@ -1714,14 +1714,16 @@
/*
* Check for transmit complete
*/
-static inline void sky2_tx_check(struct sky2_hw *hw, int port)
-{
- struct net_device *dev = hw->dev[port];
+#define TX_NO_STATUS 0xffff
- if (dev && netif_running(dev)) {
- sky2_tx_complete(netdev_priv(dev),
- sky2_read16(hw, port == 0
- ? STAT_TXA1_RIDX : STAT_TXA2_RIDX));
+static inline void sky2_tx_check(struct sky2_hw *hw, int port, u16 last)
+{
+ if (last != TX_NO_STATUS) {
+ struct net_device *dev = hw->dev[port];
+ if (dev && netif_running(dev)) {
+ struct sky2_port *sky2 = netdev_priv(dev);
+ sky2_tx_complete(sky2, last);
+ }
}
}
@@ -1735,6 +1737,7 @@
unsigned int to_do = min(dev0->quota, *budget);
unsigned int work_done = 0;
u16 hwidx;
+ u16 tx_done[2] = { TX_NO_STATUS, TX_NO_STATUS };
sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
hwidx = sky2_read16(hw, STAT_PUT_IDX);
@@ -1806,7 +1809,10 @@
break;
case OP_TXINDEXLE:
- /* pick up transmit status later */
+ /* TX index reports status for both ports */
+ tx_done[0] = status & 0xffff;
+ tx_done[1] = ((status >> 24) & 0xff)
+ | (u16)(length & 0xf) << 8;
break;
default:
@@ -1818,16 +1824,13 @@
}
exit_loop:
- sky2_tx_check(hw, 0);
- sky2_tx_check(hw, 1);
-
mmiowb();
+ sky2_tx_check(hw, 0, tx_done[0]);
+ sky2_tx_check(hw, 1, tx_done[1]);
+
if (work_done < to_do) {
- /*
- * Another chip workaround, need to restart TX timer if status
- * LE was handled. WA_DEV_43_418
- */
+ /* need to restart TX timer */
if (is_ec_a1(hw)) {
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);