[PATCH v2 0/9] Improve handling of MTU limits

[David Gibson <david@gibson.dropbear.id.au>]

After considerable lead up, this corrects the handling of the --mtu
option so that it will respect limits imposed by the backend tap
layers, correctly accounting for L2 headers.

This incorporates the earlier mode setting patches, on which the rest
depend.  There's been no change in those patches, there just included
here for self-containedness.

v2:
 * More static_assert() validation of frame limits in 6/9
 * Cosmetic fixups in 6/9

David Gibson (9):
  conf: Use the same optstring for passt and pasta modes
  conf: Move mode detection into helper function
  conf: Detect vhost-user mode earlier
  packet: Give explicit name to maximum packet size
  packet: Remove redundant TAP_BUF_BYTES define
  tap: Use explicit defines for maximum length of L2 frame
  Simplify sizing of pkt_buf
  pcap: Correctly set snaplen based on tap backend type
  conf: Limit maximum MTU based on backend frame size

 conf.c   | 98 +++++++++++++++++++++++++++++++++++++++++---------------
 conf.h   |  1 +
 packet.c |  4 +--
 packet.h |  3 ++
 passt.c  | 16 ++-------
 passt.h  |  7 ++--
 pcap.c   | 46 +++++++++++++-------------
 tap.c    | 44 ++++++++++++++++++++++---
 tap.h    | 26 +++++++++++++++
 util.h   |  3 --
 10 files changed, 173 insertions(+), 75 deletions(-)

-- 
2.48.1