how can Arria10 10GE MAC send the long packet ?

Hi,

I noticed there is one register control called "tx_frame_maxlength" (0x002C) as shown in user guide doc page 77.

• https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_32b_10g_ethernet_mac.pdf

You can try change this register value from default 1518 setting to some other setting

Thanks.

Regards,

dlim

Hi,

Sorry, I take back my words.

I cross check with Ethernet frame spec as in IEEE 802.3.

• https://en.wikipedia.org/wiki/Ethernet_frame
• 1500 indeed is already max payload size.
• So, you can't set something bigger than it. You just need to transfer multiple times if you have more data transfer.

Thanks.

Regards,

dlim

HI,

9600 is referring to jumbo packet. Standard packet still only support 1500.

• https://en.wikipedia.org/wiki/Jumbo_frame

As the Max Tx/Rx frame length bit are 16 bits register, so you should be able to still set it to 9600 but you need to take care of external FIFO depth size to be able to support this large data transfer.

I found out below KDB link that mentioned about the risk in transferring large packet size

• https://www.intel.com/content/altera-www/global/en_us/index/support/support-resources/knowledge-base/solutions/rd05062016_504.html

Thanks.

Regards,

dlim

Hi,

I hope I have answered your doubt.

I am now setting this case to closure.

Thanks.

Regards,

dlim