topic Re: Enable jumbo frames on iMX8QM in i.MX Processors

Enable jumbo frames on iMX8QM

Vlongobardi — Mon, 06 Feb 2023 14:30:44 GMT

Hi all,

Do you know if it is possible to enable Jumbo Frames on iMX8QM, and if yes, how could I do that?

The Atheros AR8031-al1b datasheet says that it supports Jumbo Frame up to 10 kB https://www.application-datasheet.com/pdf/qualcomm/ar8031-al1b.pdf

But executing "ip -d link list" maxmtu is 1966 byte

On the iMX8MPlus documentation (11.7.6.1.2.3) I read that the ENET_QOS memory map has a register, MAC Configuration Register, which has a bit (bit 16, JE) that have to be asserted to enable Jumbo Frames. Do you know if iMX8QM has something similar? How I suppose to assert that bit eventually?

Thanks,

Vincenzo

Re: Enable jumbo frames on iMX8QM

joanxie — Tue, 07 Feb 2023 06:12:30 GMT

pls refer to the link as below:

"https://community.nxp.com/t5/i-MX-Processors/How-to-set-jumbo-frame/m-p/1074877"

Re: Enable jumbo frames on iMX8QM

Vlongobardi — Tue, 14 Feb 2023 08:34:05 GMT

Hi, thank you for your reply.

Do you know whether I have to modify the if_ether.h file and build it again or I just have to modify the file?

Unfortunately the latter didn't work for me.

Re: Enable jumbo frames on iMX8QM

joanxie — Thu, 16 Feb 2023 03:32:01 GMT

pls refer to this patch

"https://lore.kernel.org/lkml/1481275255-7650-1-git-send-email-nikita.yoush@cogentembedded.com/"