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Commit 13b97b74 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[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: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 0e3ff6aa

drivers/net/sky2.c

+19 −16
Original line number Diff line number Diff line
@@ -1274,7 +1274,7 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) 
}



/* 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 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2, 
/*

 * Check for transmit complete

 */

static inline void sky2_tx_check(struct sky2_hw *hw, int port)

#define TX_NO_STATUS	0xffff



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)) {

		sky2_tx_complete(netdev_priv(dev),

				 sky2_read16(hw, port == 0

					     ? STAT_TXA1_RIDX : STAT_TXA2_RIDX));

			struct sky2_port *sky2 = netdev_priv(dev);

			sky2_tx_complete(sky2, last);

		}

	}

}
@@ -1735,6 +1737,7 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
	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 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
			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 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
	}



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);