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sky2: check for more work before leaving NAPI

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This patch avoids generating another IRQ if more packets
arrive while in the NAPI poll routine. Before marking device as
finished, it rechecks that the status ring is empty.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2007-07-09 15:33:36 -07:00 committed by Jeff Garzik
parent 3cf267539f
commit 5c11ce700f
1 changed files with 17 additions and 18 deletions
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35
drivers/net/sky2.c
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@ -2477,8 +2477,7 @@ static void sky2_err_intr(struct sky2_hw *hw, u32 status)
static int sky2_poll(struct net_device *dev0, int *budget)
{
struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
int work_limit = min(dev0->quota, *budget);
int work_done = 0;
int work_done;
u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
if (unlikely(status & Y2_IS_ERROR))
@ -2490,25 +2489,25 @@ static int sky2_poll(struct net_device *dev0, int *budget)
if (status & Y2_IS_IRQ_PHY2)
sky2_phy_intr(hw, 1);
work_done = sky2_status_intr(hw, work_limit);
if (work_done < work_limit) {
/* Bug/Errata workaround?
* Need to kick the TX irq moderation timer.
*/
if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
}
netif_rx_complete(dev0);
work_done = sky2_status_intr(hw, min(dev0->quota, *budget));
*budget -= work_done;
dev0->quota -= work_done;
/* end of interrupt, re-enables also acts as I/O synchronization */
sky2_read32(hw, B0_Y2_SP_LISR);
return 0;
} else {
*budget -= work_done;
dev0->quota -= work_done;
/* More work? */
if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))
return 1;
/* Bug/Errata workaround?
* Need to kick the TX irq moderation timer.
*/
if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
}
netif_rx_complete(dev0);
sky2_read32(hw, B0_Y2_SP_LISR);
return 0;
}
static irqreturn_t sky2_intr(int irq, void *dev_id)