[src/netbsd-1-4]: src/sys/dev/ic Pull up revision 1.31 (via patch, requested ...

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/894c5fdc2132
branches:  netbsd-1-4
changeset: 470608:894c5fdc2132
user:      he <he%NetBSD.org@localhost>
date:      Mon May 22 21:23:34 2000 +0000

description:
Pull up revision 1.31 (via patch, requested by thorpej):
  Use the lower bits of the crc32 for the multicast address filter,
  not the upper bits.  Fixes PR#8268.

diffstat:

 sys/dev/ic/smc83c170.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r f128776ec729 -r 894c5fdc2132 sys/dev/ic/smc83c170.c
--- a/sys/dev/ic/smc83c170.c    Mon May 22 21:15:13 2000 +0000
+++ b/sys/dev/ic/smc83c170.c    Mon May 22 21:23:34 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: smc83c170.c,v 1.15.2.2 2000/02/08 22:04:45 he Exp $    */
+/*     $NetBSD: smc83c170.c,v 1.15.2.3 2000/05/22 21:23:34 he Exp $    */
 
 /*-
  * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@@ -1240,7 +1240,7 @@
 
        /*
         * Set up the multicast address filter by passing all multicast
-        * addresses through a CRC generator, and then using the high-order
+        * addresses through a CRC generator, and then using the low-order
         * 6 bits as an index into the 64 bit multicast hash table (only
         * the lower 16 bits of each 32 bit multicast hash register are
         * valid).  The high order bit selects the register, while the
@@ -1278,8 +1278,8 @@
                        crc = (crc >> 4) ^ crctab[crc & 0xf];
                        crc = (crc >> 4) ^ crctab[crc & 0xf];
                }
-               /* Just want the 6 most significant bits. */
-               crc >>= 26;
+               /* Just want the 6 least significant bits. */
+               crc &= 0x3f;
 
                /* Set the corresponding bit in the hash table. */
                mchash[crc >> 4] |= 1 << (crc & 0xf);