Author: ticso
Date: Sun Feb 28 16:11:13 2010
New Revision: 204462
URL: http://svn.freebsd.org/changeset/base/204462
Log:
Fix multicast hashes.
Atmel uses a simple xor hash instead of the typical crc based one.
Modified:
head/sys/arm/at91/if_ate.c
Modified: head/sys/arm/at91/if_ate.c
==============================================================================
--- head/sys/arm/at91/if_ate.c Sun Feb 28 14:43:55 2010 (r204461)
+++ head/sys/arm/at91/if_ate.c Sun Feb 28 16:11:13 2010 (r204462)
@@ -380,6 +380,20 @@ ate_load_rx_buf(void *arg, bus_dma_segme
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);
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