From: Stephen Hemminger Date: Fri, 9 Dec 2005 19:35:00 +0000 (-0800) Subject: [PATCH] sky2: map length optimization X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=734d18684695dd1c6a9527b50e01bba4acab4738;p=linux-beck.git [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: Stephen Hemminger Signed-off-by: Jeff Garzik --- diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 2dd46a05fb30..b1a5886a48a0 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -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; diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h index 29ebca099f99..1a91c2d4561c 100644 --- a/drivers/net/sky2.h +++ b/drivers/net/sky2.h @@ -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;