diff options
| -rw-r--r-- | hw/eepro100.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/hw/eepro100.c b/hw/eepro100.c index 02e6f7e..6279ae3 100644 --- a/hw/eepro100.c +++ b/hw/eepro100.c @@ -322,8 +322,32 @@ static const uint16_t eepro100_mdi_mask[] = { 0xffff, 0xffff, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, }; +#define POLYNOMIAL 0x04c11db6 + static E100PCIDeviceInfo *eepro100_get_class(EEPRO100State *s); +/* From FreeBSD (locally modified). */ +static unsigned e100_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 & BITS(7, 2)) >> 2; +} + /* Read a 16 bit control/status (CSR) register. */ static uint16_t e100_read_reg2(EEPRO100State *s, E100RegisterOffset addr) { @@ -823,7 +847,7 @@ static void set_multicast_list(EEPRO100State *s) uint8_t multicast_addr[6]; pci_dma_read(&s->dev, s->cb_address + 10 + i, multicast_addr, 6); TRACE(OTHER, logout("multicast entry %s\n", nic_dump(multicast_addr, 6))); - unsigned mcast_idx = compute_mcast_idx(multicast_addr); + unsigned mcast_idx = e100_compute_mcast_idx(multicast_addr); assert(mcast_idx < 64); s->mult[mcast_idx >> 3] |= (1 << (mcast_idx & 7)); } @@ -1650,7 +1674,7 @@ static ssize_t nic_receive(VLANClientState *nc, const uint8_t * buf, size_t size if (s->configuration[21] & BIT(3)) { /* Multicast all bit is set, receive all multicast frames. */ } else { - unsigned mcast_idx = compute_mcast_idx(buf); + unsigned mcast_idx = e100_compute_mcast_idx(buf); assert(mcast_idx < 64); if (s->mult[mcast_idx >> 3] & (1 << (mcast_idx & 7))) { /* Multicast frame is allowed in hash table. */ |