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Commit 13210ce5 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] sky2: improve receive performance 



Changes to receive side processing:
	* bigger receive ring
	* clean up polling loop

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 42eeea01

drivers/net/sky2.c

+34 −32
Original line number Diff line number Diff line
@@ -72,10 +72,10 @@ 
	unlikely((hw)->chip_id == CHIP_ID_YUKON_EC && \

		 (hw)->chip_rev == CHIP_REV_YU_EC_A1)



#define RX_LE_SIZE	    	256

#define RX_LE_SIZE	    	512

#define RX_LE_BYTES		(RX_LE_SIZE*sizeof(struct sky2_rx_le))

#define RX_MAX_PENDING		(RX_LE_SIZE/2 - 2)

#define RX_DEF_PENDING		128

#define RX_DEF_PENDING		RX_MAX_PENDING

#define RX_COPY_THRESHOLD	256



#define TX_RING_SIZE		512
@@ -1596,7 +1596,6 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2, 
{

	struct ring_info *re = sky2->rx_ring + sky2->rx_next;

	struct sk_buff *skb = NULL;

	struct net_device *dev;

	const unsigned int bufsize = rx_size(sky2);



	if (unlikely(netif_msg_rx_status(sky2)))
@@ -1643,11 +1642,6 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2, 
	}



	skb_put(skb, length);

	dev = sky2->netdev;

	skb->dev = dev;

	skb->protocol = eth_type_trans(skb, dev);

	dev->last_rx = jiffies;



resubmit:

	re->skb->ip_summed = CHECKSUM_NONE;

	sky2_rx_add(sky2, re);
@@ -1702,35 +1696,42 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
	BUG_ON(hwidx >= STATUS_RING_SIZE);

 	rmb();



	do {

	while (hwidx != hw->st_idx) {

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

		struct net_device *dev;

		struct sky2_port *sky2;

		struct sk_buff *skb;

		u32 status;

		u16 length;

		u8 op;



		/* Are we done yet? */

		if (hw->st_idx == hwidx) {

			sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);

			hwidx = sky2_read16(hw, STAT_PUT_IDX);

			if (hwidx == hw->st_idx)

				break;

		}



		le = hw->st_le + hw->st_idx;

		hw->st_idx = (hw->st_idx + 1) % STATUS_RING_SIZE;

		prefetch(&hw->st_le[hw->st_idx]);

		prefetch(hw->st_le + hw->st_idx);



		BUG_ON(le->link >= hw->ports || !hw->dev[le->link]);



		sky2 = netdev_priv(hw->dev[le->link]);

		BUG_ON(le->link >= 2);

		dev = hw->dev[le->link];

		if (dev == NULL || !netif_running(dev))

			continue;



		sky2 = netdev_priv(dev);

		status = le32_to_cpu(le->status);

		length = le16_to_cpu(le->length);

		op = le->opcode & ~HW_OWNER;

		le->opcode = 0;



		switch (le->opcode & ~HW_OWNER) {

		switch (op) {

		case OP_RXSTAT:

			skb = sky2_receive(sky2, length, status);

			if (!skb)

				break;



			skb->dev = dev;

			skb->protocol = eth_type_trans(skb, dev);

			dev->last_rx = jiffies;



#ifdef SKY2_VLAN_TAG_USED

			if (sky2->vlgrp && (status & GMR_FS_VLAN)) {

				vlan_hwaccel_receive_skb(skb,
@@ -1739,7 +1740,9 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
			} else

#endif

				netif_receive_skb(skb);

			++work_done;



			if (++work_done >= to_do)

				goto exit_loop;

			break;



#ifdef SKY2_VLAN_TAG_USED
@@ -1765,18 +1768,15 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
		default:

			if (net_ratelimit())

				printk(KERN_WARNING PFX

				       "unknown status opcode 0x%x\n",

				       le->opcode);

				       "unknown status opcode 0x%x\n", op);

			break;

		}

	}



		le->opcode = 0;	/* paranoia */

	} while (work_done < to_do);

exit_loop:



	mmiowb();



	*budget -= work_done;

	dev0->quota -= work_done;

	if (work_done < to_do) {

		/*

		 * Another chip workaround, need to restart TX timer if status
@@ -1790,11 +1790,13 @@ static int sky2_poll(struct net_device *dev0, int *budget) 
		netif_rx_complete(dev0);

		hw->intr_mask |= Y2_IS_STAT_BMU;

		sky2_write32(hw, B0_IMSK, hw->intr_mask);

		sky2_read32(hw, B0_IMSK);

		mmiowb();

		return 0;

	} else {

		*budget -= work_done;

		dev0->quota -= work_done;

		return 1;

	}



	return work_done >= to_do;



}



static void sky2_hw_error(struct sky2_hw *hw, unsigned port, u32 status)