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AM5726: Jumbo Ethernet frame support

Frank Bormann3
Prodigy 10 points

Part Number: AM5726

Hi,

I was wondering if either of the GMAC (cpsw) and/or PRU Ethernet (prueth) controllers on the am5726 will support Ethernet jumbo frames and if so up to what size?

There appears to be conflicting information that I found in the TRQ.

  • Under 24.11.1.1, it states maximum frame size is limited to 2016/2020 bytes (depending on the presence of VLAN). However, I am unsure if this is a limitation of the on-chip switch only or if this applies to the GMAC controller in general.
  • On the other hand, there is an RX_MAXLEN field in the SL_RX_MAXLEN register documented under 24.11.6.9.2, which is 14 bits in size, and could therefore indicate full jumbo frame support up to 16K packet size.

Looks like neither the cpsw nor the prueth Ethernet drivers in kernel 4.9 support jumbo frames, as they block setting MTU to anything past the usual 1500 bytes. Does anyone know if this changed in later DSK versions of the drivers?

Thanks,
Frank