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Commit 734d1868 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] sky2: map length optimization 



Don't need to keep track of mapping length in ring structure
because we can get the same info from other info.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 129372d0

drivers/net/sky2.c

+28 −29
Original line number Diff line number Diff line
@@ -729,23 +729,23 @@ static inline u32 high32(dma_addr_t a) 
}



/* Build description to hardware about buffer */

static inline void sky2_rx_add(struct sky2_port *sky2, struct ring_info *re)

static inline void sky2_rx_add(struct sky2_port *sky2, dma_addr_t map)

{

	struct sky2_rx_le *le;

	u32 hi = high32(re->mapaddr);

	u32 hi = high32(map);

	u16 len = sky2->rx_bufsize;



	re->idx = sky2->rx_put;

	if (sky2->rx_addr64 != hi) {

		le = sky2_next_rx(sky2);

		le->addr = cpu_to_le32(hi);

		le->ctrl = 0;

		le->opcode = OP_ADDR64 | HW_OWNER;

		sky2->rx_addr64 = high32(re->mapaddr + re->maplen);

		sky2->rx_addr64 = high32(map + len);

	}



	le = sky2_next_rx(sky2);

	le->addr = cpu_to_le32((u32) re->mapaddr);

	le->length = cpu_to_le16(re->maplen);

	le->addr = cpu_to_le32((u32) map);

	le->length = cpu_to_le16(len);

	le->ctrl = 0;

	le->opcode = OP_PACKET | HW_OWNER;

}
@@ -814,7 +814,7 @@ static void sky2_rx_clean(struct sky2_port *sky2) 


		if (re->skb) {

			pci_unmap_single(sky2->hw->pdev,

					 re->mapaddr, re->maplen,

					 re->mapaddr, sky2->rx_bufsize,

					 PCI_DMA_FROMDEVICE);

			kfree_skb(re->skb);

			re->skb = NULL;
@@ -895,12 +895,6 @@ static void sky2_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid) 
}

#endif



#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

static inline unsigned rx_size(const struct sky2_port *sky2)

{

	return roundup(sky2->netdev->mtu + ETH_HLEN + 4, 8);

}



/*

 * Allocate and setup receiver buffer pool.

 * In case of 64 bit dma, there are 2X as many list elements
@@ -915,7 +909,6 @@ static inline unsigned rx_size(const struct sky2_port *sky2) 
static int sky2_rx_start(struct sky2_port *sky2)

{

	struct sky2_hw *hw = sky2->hw;

	unsigned size = rx_size(sky2);

	unsigned rxq = rxqaddr[sky2->port];

	int i;
@@ -927,14 +920,13 @@ static int sky2_rx_start(struct sky2_port *sky2) 
	for (i = 0; i < sky2->rx_pending; i++) {

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



		re->skb = dev_alloc_skb(size);

		re->skb = dev_alloc_skb(sky2->rx_bufsize);

		if (!re->skb)

			goto nomem;



		re->mapaddr = pci_map_single(hw->pdev, re->skb->data,

					     size, PCI_DMA_FROMDEVICE);

		re->maplen = size;

		sky2_rx_add(sky2, re);

					     sky2->rx_bufsize, PCI_DMA_FROMDEVICE);

		sky2_rx_add(sky2, re->mapaddr);

	}



	/* Tell chip about available buffers */
@@ -1182,7 +1174,6 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev) 
	/* Record the transmit mapping info */

	re->skb = skb;

	re->mapaddr = mapping;

	re->maplen = len;



	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {

		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
@@ -1209,7 +1200,6 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev) 
		    + ((re - sky2->tx_ring) + i + 1) % TX_RING_SIZE;

		fre->skb = NULL;

		fre->mapaddr = mapping;

		fre->maplen = frag->size;

	}

	re->idx = sky2->tx_prod;

	le->ctrl |= EOP;
@@ -1258,8 +1248,8 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) 
			goto out;



		skb = re->skb;

		pci_unmap_single(sky2->hw->pdev,

				 re->mapaddr, re->maplen, PCI_DMA_TODEVICE);

		pci_unmap_single(sky2->hw->pdev, re->mapaddr,

				 skb_headlen(skb), PCI_DMA_TODEVICE);



		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {

			struct ring_info *fre;
@@ -1267,7 +1257,8 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) 
			    sky2->tx_ring + (sky2->tx_cons + i +

					     1) % TX_RING_SIZE;

			pci_unmap_page(sky2->hw->pdev, fre->mapaddr,

				       fre->maplen, PCI_DMA_TODEVICE);

				       skb_shinfo(skb)->frags[i].size,

				       PCI_DMA_TODEVICE);

		}



		dev_kfree_skb_any(skb);
@@ -1579,6 +1570,14 @@ static void sky2_tx_timeout(struct net_device *dev) 
	sky2_tx_clean(sky2);

}





#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

/* Want receive buffer size to be multiple of 64 bits, and incl room for vlan */

static inline unsigned sky2_buf_size(int mtu)

{

	return roundup(mtu + ETH_HLEN + 4, 8);

}



static int sky2_change_mtu(struct net_device *dev, int new_mtu)

{

	struct sky2_port *sky2 = netdev_priv(dev);
@@ -1609,6 +1608,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu) 
	sky2_rx_clean(sky2);



	dev->mtu = new_mtu;

	sky2->rx_bufsize = sky2_buf_size(new_mtu);

	mode = DATA_BLIND_VAL(DATA_BLIND_DEF) |

		GM_SMOD_VLAN_ENA | IPG_DATA_VAL(IPG_DATA_DEF);
@@ -1639,7 +1639,6 @@ 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;

	const unsigned int bufsize = rx_size(sky2);



	if (unlikely(netif_msg_rx_status(sky2)))

		printk(KERN_DEBUG PFX "%s: rx slot %u status 0x%x len %d\n",
@@ -1669,25 +1668,24 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2, 
	} else {

		struct sk_buff *nskb;



		nskb = dev_alloc_skb(bufsize);

		nskb = dev_alloc_skb(sky2->rx_bufsize);

		if (!nskb)

			goto resubmit;



		skb = re->skb;

		re->skb = nskb;

		pci_unmap_single(sky2->hw->pdev, re->mapaddr,

				 re->maplen, PCI_DMA_FROMDEVICE);

				 sky2->rx_bufsize, PCI_DMA_FROMDEVICE);

		prefetch(skb->data);



		re->mapaddr = pci_map_single(sky2->hw->pdev, nskb->data,

					     bufsize, PCI_DMA_FROMDEVICE);

		re->maplen = bufsize;

					     sky2->rx_bufsize, PCI_DMA_FROMDEVICE);

	}



	skb_put(skb, length);

resubmit:

	re->skb->ip_summed = CHECKSUM_NONE;

	sky2_rx_add(sky2, re);

	sky2_rx_add(sky2, re->mapaddr);



	/* Tell receiver about new buffers. */

	sky2_put_idx(sky2->hw, rxqaddr[sky2->port], sky2->rx_put,
@@ -2919,6 +2917,7 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw, 
	init_MUTEX(&sky2->phy_sema);

	sky2->tx_pending = TX_DEF_PENDING;

	sky2->rx_pending = is_ec_a1(hw) ? 8 : RX_DEF_PENDING;

	sky2->rx_bufsize = sky2_buf_size(ETH_DATA_LEN);



	hw->dev[port] = dev;

drivers/net/sky2.h

+1 −1
Original line number Diff line number Diff line
@@ -1780,7 +1780,6 @@ struct sky2_status_le { 
struct ring_info {

	struct sk_buff	*skb;

	dma_addr_t	mapaddr;

	u16		maplen;

	u16		idx;

};
@@ -1807,6 +1806,7 @@ struct sky2_port { 
	u16		     rx_put;		/* next le index to use */

	u16		     rx_pending;

	u16		     rx_last_put;

	u16		     rx_bufsize;

#ifdef SKY2_VLAN_TAG_USED

	u16		     rx_tag;

	struct vlan_group    *vlgrp;