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[SKY2]: status polling loop (post merge)

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Handle the corner case where budget is exhausted correctly.
And save unnecessary read of index register.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-10-11 18:31:13 -07:00 • committed by David S. Miller
parent 6f53576316
commit 2669183032
1 changed files with 18 additions and 25 deletions
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43
drivers/net/sky2.c
View file

@ -2245,15 +2245,13 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last)
} }
/* Process status response ring */ /* Process status response ring */
static int sky2_status_intr(struct sky2_hw *hw, int to_do) static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
{ {
int work_done = 0; int work_done = 0;
unsigned rx[2] = { 0, 0 }; unsigned rx[2] = { 0, 0 };
u16 hwidx = sky2_read16(hw, STAT_PUT_IDX);
rmb(); rmb();
do {
while (hw->st_idx != hwidx) {
struct sky2_port *sky2; struct sky2_port *sky2;
struct sky2_status_le *le = hw->st_le + hw->st_idx; struct sky2_status_le *le = hw->st_le + hw->st_idx;
unsigned port = le->css & CSS_LINK_BIT; unsigned port = le->css & CSS_LINK_BIT;
@ -2364,7 +2362,7 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do)
printk(KERN_WARNING PFX printk(KERN_WARNING PFX
"unknown status opcode 0x%x\n", le->opcode); "unknown status opcode 0x%x\n", le->opcode);
} }
} } while (hw->st_idx != idx);
/* Fully processed status ring so clear irq */ /* Fully processed status ring so clear irq */
sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ); sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
@ -2607,6 +2605,7 @@ static int sky2_poll(struct napi_struct *napi, int work_limit)
struct sky2_hw *hw = container_of(napi, struct sky2_hw, napi); struct sky2_hw *hw = container_of(napi, struct sky2_hw, napi);
u32 status = sky2_read32(hw, B0_Y2_SP_EISR); u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
int work_done = 0; int work_done = 0;
u16 idx;
if (unlikely(status & Y2_IS_ERROR)) if (unlikely(status & Y2_IS_ERROR))
sky2_err_intr(hw, status); sky2_err_intr(hw, status);
@ -2617,30 +2616,24 @@ static int sky2_poll(struct napi_struct *napi, int work_limit)
if (status & Y2_IS_IRQ_PHY2) if (status & Y2_IS_IRQ_PHY2)
sky2_phy_intr(hw, 1); sky2_phy_intr(hw, 1);
for(;;) { while ((idx = sky2_read16(hw, STAT_PUT_IDX)) != hw->st_idx) {
work_done += sky2_status_intr(hw, work_limit); work_done += sky2_status_intr(hw, work_limit - work_done, idx);
if (work_done >= work_limit) if (work_done >= work_limit)
break; goto done;
/* More work? */
if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))
continue;
/* 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);
}
napi_complete(napi);
sky2_read32(hw, B0_Y2_SP_LISR);
break;
} }
/* 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);
}
napi_complete(napi);
sky2_read32(hw, B0_Y2_SP_LISR);
done:
return work_done; return work_done;
} }