Am 13.12.2011 um 03:50 schrieb YongHyeon PYUN:
> On Tue, Dec 13, 2011 at 12:56:22AM +0100, Stefan Bethke wrote:
>> I'm currently writing a driver to configure an ethernet switch chip (see
>> TL-WR1043ND on -embedded).
>>
>> I noticed that there doesn't seem to be a way to power down a phy right now
>> through the ifconfig media command.
>>
>> Would there be objections to extend the media subtype definitions to include
>> an "off", "poweroff" or "down" media subtype, and add code to the relevant
>> phy drivers to power down the phy for this media subtype?
>>
>> The difference between media subtype "none" and this new one would be that
>> there will be no link, even if there is a physical connection. With media
>> subtype "none", a 10 MBit/s half-duplex connection is established,
>> potentially confusing the remote end about the availability of this link.
>> On the local side, the link is down, so no packets are exchanged.
>>
>
> I think "none" means "isolated" so should have no established link
> and probably you can also power down the PHY.
> I vaguely guess the PHY of switch chip does not correctly support
> isolated mode so you may have wanted to power down.
After looking at the code a bit more, I think the common code just doesn't set
the BMCR_PDOWN (but clears it when bringing up the PHY).
Index: sys/dev/mii/mii_physubr.c
===================================================================
--- sys/dev/mii/mii_physubr.c (revision 228402)
+++ sys/dev/mii/mii_physubr.c (working copy)
@@ -58,7 +58,7 @@
*/
static const struct mii_media mii_media_table[MII_NMEDIA] = {
/* None */
- { BMCR_ISO, ANAR_CSMA,
+ { BMCR_ISO | BMCR_PDOWN, ANAR_CSMA,
0, },
/* 10baseT */
I've opened kern/163240.
http://www.freebsd.org/cgi/query-pr.cgi?pr=163240
Stefan
--
Stefan Bethke <s...@lassitu.de> Fon +49 151 14070811
_______________________________________________
freebsd-net@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-net
To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
