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Commit 26691830 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[SKY2]: status polling loop (post merge) 



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

Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6f535763

drivers/net/sky2.c

+17 −24
Original line number Diff line number Diff line
@@ -2245,15 +2245,13 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last) 
}



/* 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;

	unsigned rx[2] = { 0, 0 };

	u16 hwidx = sky2_read16(hw, STAT_PUT_IDX);



	rmb();



	while (hw->st_idx != hwidx) {

	do {

		struct sky2_port *sky2;

		struct sky2_status_le *le  = hw->st_le + hw->st_idx;

		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

				       "unknown status opcode 0x%x\n", le->opcode);

		}

	}

	} while (hw->st_idx != idx);



	/* Fully processed status ring so clear 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);

	u32 status = sky2_read32(hw, B0_Y2_SP_EISR);

	int work_done = 0;

	u16 idx;



	if (unlikely(status & Y2_IS_ERROR))

		sky2_err_intr(hw, status);
@@ -2617,15 +2616,12 @@ static int sky2_poll(struct napi_struct *napi, int work_limit) 
	if (status & Y2_IS_IRQ_PHY2)

		sky2_phy_intr(hw, 1);



	for(;;) {

		work_done += sky2_status_intr(hw, work_limit);

	while ((idx = sky2_read16(hw, STAT_PUT_IDX)) != hw->st_idx) {

		work_done += sky2_status_intr(hw, work_limit - work_done, idx);



		if (work_done >= work_limit)

			break;



		/* More work? */

		if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))

			continue;

			goto done;

	}



	/* Bug/Errata workaround?

	 * Need to kick the TX irq moderation timer.
@@ -2634,12 +2630,9 @@ static int sky2_poll(struct napi_struct *napi, int work_limit) 
		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;



	}

done:



	return work_done;

}