[dpdk-users] RX of multi-segment jumbo frames

Wiles, Keith keith.wiles at intel.com
Sat Feb 9 14:51:54 CET 2019



> On Feb 9, 2019, at 5:11 AM, Filip Janiszewski <contact at filipjaniszewski.com> wrote:
> 
> Hi,
> 
> I'm attempting to receive jumbo frames (~9000 bytes) on a Mellonox card
> using DPDK, I've configured the DEV_RX_OFFLOAD_JUMBO_FRAME offload for
> rte_eth_conf and rte_eth_rxconf (per RX Queue), but I can capture jumbo
> frames only if the mbuf is large enough to contain the whole packet, is
> there a way to enable DPDK to chain the incoming data in mbufs smaller
> than the actual packet?
> 
> We don't have many of those big packets coming in, so would be optimal
> to leave the mbuf size to RTE_MBUF_DEFAULT_BUF_SIZE and then configure
> the RX device to chain those bufs for larger packets, but can't find a
> way to do it, any suggestion?
> 

the best i understand is the nic or pmd needs to be configured to split up packets between mbufs in the rx ring. i look in the docs for the nic and see if it supports splitting up packets or ask the maintainer from the maintainers file.
> Thanks
> 
> -- 
> BR, Filip
> +48 666 369 823

Regards,
Keith



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