[dpdk-dev] jumbo frame support for 82583V

[Lu, Wenzhuo]

Hi Klaus,

> -----Original Message-----
> From: Klaus Degner [mailto:kd at allegro-packets.com]
> Sent: Friday, July 17, 2015 7:56 PM
> To: Lu, Wenzhuo
> Cc: dev at dpdk.org
> Subject: jumbo frame support for 82583V
> 
> Hi Wenzhuo,
> 
> We are testing different Intel NICs for DPDK. We have tested the master branch
> with the support for 82583V Intel chip.
> It works very well except that we can only use up to 1518 bytes for maximum
> packet capture.
> We have debugged this and it is restricted in the initialization:
> 
> http://dpdk.org/browse/dpdk/tree/drivers/net/e1000/em_ethdev.c#n855
> 
> Without DPDK, the linux driver support and mtu up to 9k and ark.intel reports
> that this chip is jumbo frame capable:
> 
> http://ark.intel.com/de/products/41676/Intel-82583V-Gigabit-Ethernet-
> Controller
> 
> Is there any specific reason why DPDK cannot use jumbo frames for this NIC ?
> 
> Thanks for help !
> 
> Klaus
Sorry, I'm not sure about the history.
According to the datasheet's update log, 82583v doesn't support jumbo frame at first.
I think the reason is the e1000 code is not updated after the datasheet said the jumbo frame is supported.
As I don’t have the NIC on hand, would you like to change the code and have a try. I mean just let
" case e1000_82583" return 9K. Thanks.