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author | Jason Wang <jasowang@redhat.com> | 2012-03-05 11:08:50 +0800 |
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committer | Michael S. Tsirkin <mst@redhat.com> | 2012-03-16 01:04:51 +0200 |
commit | 7fc8d918b9674c3e9233d6d25da2457345d414a0 (patch) | |
tree | a834bd8e25277d2f6d5018945f2b64dfb7d602fe /net.c | |
parent | afe0a595356192d5f79703cf6462fcc112df007c (diff) | |
download | hqemu-7fc8d918b9674c3e9233d6d25da2457345d414a0.zip hqemu-7fc8d918b9674c3e9233d6d25da2457345d414a0.tar.gz |
net: move compute_mcast_idx() to net.h
Reduce duplicated codes.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'net.c')
-rw-r--r-- | net.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1475,3 +1475,26 @@ int net_client_parse(QemuOptsList *opts_list, const char *optarg) default_net = 0; return 0; } + +/* From FreeBSD */ +/* XXX: optimize */ +unsigned 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; +} |