diff options
author | ticso <ticso@FreeBSD.org> | 2010-02-28 16:11:13 +0000 |
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committer | ticso <ticso@FreeBSD.org> | 2010-02-28 16:11:13 +0000 |
commit | e48555b36f80fffa260c40354025179880b479e6 (patch) | |
tree | 0c8c3d4edf636aebd87b83dd44c9d9bdeb037e06 /sys/arm | |
parent | 01a68ffd1a979000a48f9032fd2221cc636f8fc3 (diff) | |
download | FreeBSD-src-e48555b36f80fffa260c40354025179880b479e6.zip FreeBSD-src-e48555b36f80fffa260c40354025179880b479e6.tar.gz |
Fix multicast hashes.
Atmel uses a simple xor hash instead of the typical crc based one.
Diffstat (limited to 'sys/arm')
-rw-r--r-- | sys/arm/at91/if_ate.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/sys/arm/at91/if_ate.c b/sys/arm/at91/if_ate.c index 6412515..ee1919b 100644 --- a/sys/arm/at91/if_ate.c +++ b/sys/arm/at91/if_ate.c @@ -380,6 +380,20 @@ ate_load_rx_buf(void *arg, bus_dma_segment_t *segs, int nsegs, int error) bus_dmamap_sync(sc->rxtag, sc->rx_map[i], BUS_DMASYNC_PREREAD); } +static uint32_t +ate_mac_hash(const uint8_t *buf) +{ + uint32_t index = 0; + uint8_t bit; + uint8_t bitshift; + for (int i = 0; i < 48; i++) { + bit = i / 6; + bitshift = i - bit * 6; + index ^= ((buf[i >> 3] >> (i & 7)) & 1) << bitshift; + } + return (index); +} + /* * Compute the multicast filter for this device using the standard * algorithm. I wonder why this isn't in ether somewhere as a lot @@ -414,8 +428,9 @@ ate_setmcast(struct ate_softc *sc) TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { if (ifma->ifma_addr->sa_family != AF_LINK) continue; - index = ether_crc32_be(LLADDR((struct sockaddr_dl *) - ifma->ifma_addr), ETHER_ADDR_LEN) >> 26; + index = 0; + index = ate_mac_hash(LLADDR((struct sockaddr_dl *) + ifma->ifma_addr)); af[index >> 3] |= 1 << (index & 7); } if_maddr_runlock(ifp); |