[PATCH v2 0/3] net: ifup: greatly reduce ifup -a time for multiple network interface

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

So far, ifup -a tries to up all non-disabled interfaces in sequence.
This can take a quite a while, because interfaces with the link down,
will be polled for 10s, before giving up on doing DHCP on them.

This series accelerates this in the common case by doing link up
check in parallel, getting down from (number_of_ports_wihout_link * 10s)
to 10s and then adds an optimization for the common case of automounts
with $global.net.server not set.

Times after eth_open_all has brought up CPU Ethernet and 4 DSA ports:

  barebox$ time ifup -a -s # old behavior
  time: 31081ms

  barebox$ time ifup -a
  time: 10002ms

  barebox$ time ifup -a1
  time: 1072ms

Ahmad Fatoum (3):
  net: ifup: have ifup -a poll for link up in parallel
  net: ifup: have ifup -a1 stop at first DHCP-set global.net.server
  defaultenv-2: automount: use ifup -a1 for NFS/TFTP automounts

 Documentation/user/automount.rst            |   2 +-
 defaultenv/defaultenv-2-base/boot/net       |   2 +-
 defaultenv/defaultenv-2-base/init/automount |   4 +-
 include/net.h                               |   5 +
 net/eth.c                                   |  28 +++--
 net/ifup.c                                  | 124 ++++++++++++++++----
 net/net.c                                   |   7 +-
 7 files changed, 138 insertions(+), 34 deletions(-)

-- 
2.30.2