AcoSail/kernel_optimize_test
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sky2: dont write status ring

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It is more efficient not to write the status ring from the
processor and just read the active portion.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
This commit is contained in:
Stephen Hemminger 2006-05-08 15:11:31 -07:00
parent 01bd75645f
commit e71ebd7327
1 changed files with 7 additions and 14 deletions
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21
drivers/net/sky2.c
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@ -1865,35 +1865,28 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last)
static int sky2_status_intr(struct sky2_hw *hw, int to_do)
{
int work_done = 0;
u16 hwidx = sky2_read16(hw, STAT_PUT_IDX);
rmb();
for(;;) {
while (hw->st_idx != hwidx) {
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 link, opcode;
opcode = le->opcode;
if (!opcode)
break;
opcode &= ~HW_OWNER;
hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE);
le->opcode = 0;
link = le->link;
BUG_ON(link >= 2);
dev = hw->dev[link];
BUG_ON(le->link >= 2);
dev = hw->dev[le->link];
sky2 = netdev_priv(dev);
length = le->length;
status = le->status;
switch (opcode) {
switch (le->opcode & ~HW_OWNER) {
case OP_RXSTAT:
skb = sky2_receive(sky2, length, status);
if (!skb)
@ -1944,8 +1937,8 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do)
default:
if (net_ratelimit())
printk(KERN_WARNING PFX
"unknown status opcode 0x%x\n", opcode);
break;
"unknown status opcode 0x%x\n", le->opcode);
goto exit_loop;
}
}