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Description: Fix decoding of MII vendor ids by mii-tool.
Bug-Debian: https://bugs.debian.org/549397
Author: Ben Hutchings <ben@decadent.org.uk>
--- a/mii-tool.c
+++ b/mii-tool.c
@@ -232,6 +232,14 @@
return buf;
}
+static unsigned char bitreverse_byte(unsigned char byte)
+{
+ byte = (byte << 4) | (byte >> 4);
+ byte = (byte & 0x33) << 2 | (byte & 0xcc) >> 2;
+ byte = (byte & 0x55) << 1 | (byte & 0xaa) >> 1;
+ return byte;
+}
+
int show_basic_mii(int sock, int phy_id)
{
char buf[200];
@@ -335,11 +343,31 @@
break;
if (i < NMII)
printf("%s rev %d\n", mii_id[i].name, mii_val[3]&0x0f);
- else
- printf("vendor %02x:%02x:%02x, model %d rev %d\n",
+ else {
+ /* Each OUI consists of 24 bits a-z of which a and b are
+ * always assigned as zero. The bit assignments in these
+ * registers are specified as:
+ * 2.15-0 c-r
+ * 3.15-10 s-x
+ * This is the opposite of the bit order within each byte
+ * for the written representation specified in section
+ * 9.5.2 of IEEE 802-2001. However, some vendors mirror
+ * the written representation, using the bit assignments:
+ * 2.15-10 f-a (?)
+ * 2.9-2 p-i
+ * 2.1-0 x-w
+ * 3.15-10 v-q
+ * Therefore we decode the registers under both
+ * interpretations.
+ */
+ printf("vendor %02x:%02x:%02x or %02x:%02x:%02x, model %d rev %d\n",
+ bitreverse_byte(mii_val[2]>>10),
+ bitreverse_byte(mii_val[2]>>2),
+ bitreverse_byte((mii_val[2]<<6)|(mii_val[3]>>10)),
mii_val[2]>>10, (mii_val[2]>>2)&0xff,
((mii_val[2]<<6)|(mii_val[3]>>10))&0xff,
(mii_val[3]>>4)&0x3f, mii_val[3]&0x0f);
+ }
printf(" basic mode: ");
if (bmcr & BMCR_RESET)
printf("software reset, ");
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