AM57x MTU limit

Uri Mashiach

Intellectual 350 points

Other Parts Discussed in Thread: AM5728

Hello,

I'm using the following:

HW: CompuLab custom board CL-SOM-AM57x with AM5728.

SW: SDK am57xx-evm-02.00.02.11.

In the technical reference manual of the AM572x, section 24.11.1.1 it is mentioned that the MTU of the GMAC_SW is 2016/2020.

I noticed that the driver limitation is 1500:

# ifconfig eth1 mtu 1500
# ifconfig eth1 mtu 1501
SIOCSIFMTU: Invalid argument

Is there any SW fix for MTU between 1500 and 2016?

Thanks,

Uri

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

At present the Linux CPSW driver does not support Jumbo frames.

0 Uri Mashiach over 9 years ago in reply to Biser Gatchev-XID

Intellectual 350 points

Hi Biser,

Is IT planning to add Jumbo frames support to the CPSW driver?
If the answer is yes, what is the schedule?

Thanks,
Uri

0 Biser Gatchev-XID over 9 years ago in reply to Uri Mashiach

TI__Guru**** 393215 points

As far as I know there are no plans for this at the moment. Besides, the maximum frame size for AM572x CPSW is 2016 bytes (2020 with VLAN), so there will not be much of a gain.

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AM57x MTU limit