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net: move compute_mcast_idx() to net.h

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Reduce duplicated codes.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2012-03-05 11:08:50 +08:00 • committed by Michael S. Tsirkin
parent afe0a59535
commit 7fc8d918b9
6 changed files with 26 additions and 98 deletions
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24
hw/rtl8139.c
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@ -708,30 +708,6 @@ static void rtl8139_update_irq(RTL8139State *s)
qemu_set_irq(s->dev.irq[0], (isr != 0));
}
#define POLYNOMIAL 0x04c11db6
/* From FreeBSD */
/* XXX: optimize */
static int compute_mcast_idx(const uint8_t *ep)
{
uint32_t crc;
int carry, i, j;
uint8_t b;
crc = 0xffffffff;
for (i = 0; i < 6; i++) {
b = *ep++;
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
crc <<= 1;
b >>= 1;
if (carry)
crc = ((crc ^ POLYNOMIAL) | carry);
}
}
return (crc >> 26);
}
static int rtl8139_RxWrap(RTL8139State *s)
{
/* wrapping enabled; assume 1.5k more buffer space if size < 65536 */