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net: introduce net_crc32_le() function

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This provides a standard ethernet CRC32 little-endian implementation.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2017-12-15 18:41:44 +00:00 • committed by Jason Wang
parent eaba8f34f0
commit f1a7deb900
2 changed files with 24 additions and 0 deletions
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22
net/net.c
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@ -1603,6 +1603,28 @@ uint32_t net_crc32(const uint8_t *p, int len)
return crc;
}
uint32_t net_crc32_le(const uint8_t *p, int len)
{
uint32_t crc;
int carry, i, j;
uint8_t b;
crc = 0xffffffff;
for (i = 0; i < len; i++) {
b = *p++;
for (j = 0; j < 8; j++) {
carry = (crc & 0x1) ^ (b & 0x01);
crc >>= 1;
b >>= 1;
if (carry) {
crc ^= POLYNOMIAL_LE;
}
}
}
return crc;
}
unsigned compute_mcast_idx(const uint8_t *ep)
{
return net_crc32(ep, ETH_ALEN) >> 26;