Software versions of OpenWrt/LEDE release, packages, etc.
Steps to reproduce
Attempt to increase the mtu beyond 1516
ifconifg eth0 mtu 1517
According to all resources the QCA9560 supports jumbo frames, as does the switch (AR8337) in this device however for an undocumented unknown reason it's hard coded in linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c:1640 to 1540. Also for reasons I do not understand I can not increase the mtu beyond 1516 up to this limit of 1540 which I need for 802.11q (1522 frame size).
This code seems to need to be reviewed by someone with access to the datasheets for the QCA9560 to properly resolve this issue.
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