SDK1.1 Freescale DPA Ethernet Driver JUMBO Frame issue

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SDK1.1 Freescale DPA Ethernet Driver JUMBO Frame issue

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amrutkulkarni
Contributor II

Hi All,

 

Currently i am using SDK1.1 source with P4040 processor which has Freescale's DPA Ethernet driver.

  1. When JUMBO frame are disabled i'm able to transfer max UDP datagram size upto 65507 bytes which is max UDP can handle and it working perfectly OK
  2. When JUMBO frames are enabled i can transfer only max of 16272 bytes and i see huge drop in the max UDP datagram size from 65507 to 16272 bytes.
  3. Bellow is the kernel config option :

        CONFIG_DPA_MAX_FRM_SIZE=9600

 

For the test #1 & # 2  MTU size on bth the end is 1500 bytes. In test #2 only JUMBO Frame support was enabled in kernel as above

 

is this some bug it the DPA Ethernet driver ? How can i fix the issue ??

Just for the testing propose when i have set different MAX_FRAM_SIZE i get different UDP max datagram size

1.9600 - 16272 bytes

2.4500   24000 bytes

3.3000   28000 bytes

 

Please let me know if anyone has any hint/answer for above question

Thank you for your help and time !!

 

Regards,

Amrut

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2 Replies

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amrutkulkarni
Contributor II

HI Fang,

Thank you for suggestion, I have included this issue in P4040 forum

Regards,

Amrut

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miduo
NXP Employee
NXP Employee

Hi, Amrut

I am afraid that this issue should not been put into the 68K/ColdFire forum. Please double check in case that you will not receive the reponse regarding your issue.

Best Regards,

Fang