K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2015-04-26T15:40:58.840248Z
K 7
svn:log
V 1354
Tie ifmedia to the generic framework of new ifnet KPI.

Implementation:
o struct if_media goes opaque into if_media.c
o ifmedia is an optional softc (keyword IF_MEDIA) of an interface.
o if_media.h declares just preprocessor defines to manipulate media
  bits. Since a conservative decision was taken in r281236, the media
  information remains a single 32-bit word.
  However, to improve type checking it is declared as if_media_t, not
  a bare integer.
  if_media.h is now automatically included from if.h
o if_attach() calls ifmedia_alloc(). if_free() calls ifmedia_free().

Driver changes:
o Drivers supply ifop_media_change and ifop_media_status callbacks in
  their ifdriver ifops. This were arguments to ifmedia_init() before.
  The ifop_media_change() callback gets additional argument of the new
  media, we are trying to swtich to.
o On attach, drivers supply array of supported media words in ifat_mediae,
  currently chose media in ifat_media and optional ifat_mediamask.
  Drivers may change the media array later via if_media_change().
o Drivers don't need to support SIOCSIFMEDIA, SIOCGIFMEDIA.  The stack
  does now.
o Drivers may call if_media_status() if they are running autonegotiation
  and wish to report new status.  The function updates link state and
  baudrate of the interface.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.

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