[FS#3285] Can't change MTU on IPQ806x devices

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Sat Aug 15 08:32:09 EDT 2020


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A new Flyspray task has been opened.  Details are below. 

User who did this - jacekowski (jacekowski) 

Attached to Project - OpenWrt/LEDE Project
Summary - Can't change MTU on IPQ806x devices
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details -  - 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.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3285

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