Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=26fcfa95aef980cab4ff1ea55979c30e772dd0dd
Commit: 26fcfa95aef980cab4ff1ea55979c30e772dd0dd
Parent: 73344863e426a3c56c7f3ac80fc6f1d4cb10460b
Author: Olof Johansson <[EMAIL PROTECTED]>
AuthorDate: Wed Aug 22 09:12:59 2007 -0500
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 16:50:57 2007 -0700
pasemi_mac: RX performance tweaks
Various RX performance tweaks, do some explicit prefetching of packet
data, etc.
Signed-off-by: Olof Johansson <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/net/pasemi_mac.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 0d80b9d..f71a686 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -471,6 +471,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int
limit)
rmb();
dp = &RX_DESC(mac, n);
+ prefetchw(dp);
macrx = dp->macrx;
if (!(macrx & XCT_MACRX_O))
@@ -492,8 +493,10 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int
limit)
if (info->dma == dma)
break;
}
+ prefetchw(info);
skb = info->skb;
+ prefetchw(skb);
info->dma = 0;
pci_unmap_single(mac->dma_pdev, dma, skb->len,
@@ -516,9 +519,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int
limit)
skb_put(skb, len);
- skb->protocol = eth_type_trans(skb, mac->netdev);
-
- if ((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
+ if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK))
{
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
XCT_MACRX_CSUM_S;
@@ -528,6 +529,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int
limit)
mac->stats.rx_bytes += len;
mac->stats.rx_packets++;
+ skb->protocol = eth_type_trans(skb, mac->netdev);
netif_receive_skb(skb);
dp->ptr = 0;
@@ -559,7 +561,7 @@ static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
for (i = start; i < mac->tx->next_to_use; i++) {
dp = &TX_DESC(mac, i);
- if (!dp || (dp->mactx & XCT_MACTX_O))
+ if (unlikely(dp->mactx & XCT_MACTX_O))
break;
count++;
@@ -948,7 +950,7 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct
net_device *dev)
struct pasemi_mac_txring *txring;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
- u64 dflags;
+ u64 dflags, mactx, ptr;
dma_addr_t map;
int flags;
@@ -976,6 +978,9 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct
net_device *dev)
if (dma_mapping_error(map))
return NETDEV_TX_BUSY;
+ mactx = dflags | XCT_MACTX_LLEN(skb->len);
+ ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
+
txring = mac->tx;
spin_lock_irqsave(&txring->lock, flags);
@@ -996,12 +1001,11 @@ static int pasemi_mac_start_tx(struct sk_buff *skb,
struct net_device *dev)
}
}
-
dp = &TX_DESC(mac, txring->next_to_use);
info = &TX_DESC_INFO(mac, txring->next_to_use);
- dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
- dp->ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
+ dp->mactx = mactx;
+ dp->ptr = ptr;
info->dma = map;
info->skb = skb;
-
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