OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by jacekowski - 15.08.2020

FS#3285 - Can't change MTU on IPQ806x devices

- I’ve personally tested it on ZyXEL NBG6817
- Any version with https://patchwork.kernel.org/patch/11283121/ patch applied
- To reproduce:
# ifdown wan
# ifconfig (wan_interface) MTU 1499 (or 1501 or anything other than 1500)

This bug is caused by txfifosz being 0 on IPQ806x devices (and possibly more) unless tx-fifo-depth is specified in device tree, potential fix would be to specify tx-fifo-depth in device tree for all affected devices, or, check if txfifosz == 0 and then allow MTU change.

Sławomir Gajowniczek commented on 15.08.2020 19:31

Same here. Archer C2600 (ipq8064)

Oliver commented on 14.09.2020 10:20

Ditto on Netgear R7800, this is a new regression since I updated from an early 2019 build. It blocks me from using baby jumbo frames (1508 MTU) over PPPoE.

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