Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into staging

# gpg: Signature made Tue 31 Mar 2020 14:15:18 BST
# gpg:                using RSA key EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* remotes/jasowang/tags/net-pull-request:
  qtest: add tulip test case
  hw/net/allwinner-sun8i-emac.c: Fix REG_ADDR_HIGH/LOW reads
  net: tulip: check frame size and r/w data length
  net/colo-compare.c: Expose "expired_scan_cycle" to users
  net/colo-compare.c: Expose "compare_timeout" to users
  hw/net/can: Make CanBusClientInfo::can_receive() return a boolean
  hw/net: Make NetCanReceive() return a boolean
  hw/net/rtl8139: Update coding style to make checkpatch.pl happy
  hw/net/rtl8139: Simplify if/else statement
  hw/net/smc91c111: Let smc91c111_can_receive() return a boolean
  hw/net/e1000e_core: Let e1000e_can_receive() return a boolean
  Fixed integer overflow in e1000e
  hw/net/i82596.c: Avoid reading off end of buffer in i82596_receive()
  hw/net/i82596: Correct command bitmask (CID 1419392)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>