[dpdk-dev] I350 jumbo frame transmission

[Bruce Richardson]

On Wed, Apr 12, 2017 at 06:21:01PM +0530, Karthikraj palanichamy wrote:
> Hi,
> 
> I am using I350 card. The API rte_eth_dev_info_get() updated the parameter
> 'max_rx_pktlen' in 'struct rte_eth_dev_info' as 16384.
> 
> But when I try transmission with multiple segments, I could not transmit
> more than 9732 bytes.
> 
> I tried with testpmd and getting the same results.ie) couldn't transmit more
> than 9732 using testpmd.
> 
> Is this a limitation or am I missing anything?
> 
> Note : I tried with X540 card. I got 'max_rx_pktlen' as 15387 and I could
> transmit and receive upto 15387.
> 
> Thanks
> Karthik
>
It seems the info returned may be wrong. According to the i350
datasheet [1], table 1-2, the max frame size supported by the i350 is
9.5k which roughly tallies with what you are seeing.

Regards,
/Bruce

[1] http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/ethernet-controller-i350-datasheet.pdf