Date: Mon, 03 Aug 1998 20:43:49 +0900 From: Masahiro Sekiguchi <seki@sysrap.cs.fujitsu.co.jp> To: freebsd-hackers@FreeBSD.ORG Subject: Issues on if_media Message-ID: <19980803204349A.seki@sysrap.cs.fujitsu.co.jp>
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I'm now working on adding if_media-based media selection into if_fe
driver. The interface between Ehternet driver and if_media is,
however, unclear for me. Could someone answer the following please?
(1) Most of the media supported by if_fe compatible cards are
half-duplex. Should I set the IFM_HDX bit when I register the
supported media (with ifmedia_add)?
My impression from if_media.h was "yes." However, I found ifconfig
doesn't work well if I do so. Moreover, if_fxp, for example, does
not set the bit for half-duplex media.
If IFM_HDX should not be set for half-duplex media, for what
purpose is this macro defined?
(2) What point is the appropriate timing to call ifmedia_add()?
In the current if_fe design, all hardware/board specific
differences are detected in fe_probe() routine. So, I think it is
best to call ifmedia_add() from fe_probe(). However, all driver
supporting ifmedia calls it in attach() routines.
Although I examined the if_media.c and found there is no problem
calling the function from probe(), I'm not sure it is expected use
of the interface, or just an accident.
(3) More generally, how I can know the "definition" of the interface
of if_media? I'm thinking about both on application interfaces
(i.e., definition for SIOCGIFMEDIA/SIOCSIFMEDIA ioctl's) and on
kernel interfaces (i.e., how to use ifmedia_add, ifmedia_set,
etc.)
(4) The if_fe driver currently supports a board named AT1700FT, which
supports 10baseFL (10Mbps optic-fiber Ethernet). What value
should I use for the Ehternet subtype for the media?
Note that AT1700FT has two network connectors, one for 10baseFL
and another for (usual) 10baseT, and it is possible to switch
between those two with software-control...
I think this is just a slip from the if_media.h and I should
send-pr it... Is it correct?
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