Re: [dpdk-dev] VLAN header insertion and removal

[Alex Markuze <alex@weka.io>]

On ingress when configuring the device
                                        1.modify
the rte_eth_conf.rxmode.hw_vlan_strip  = 1,

On egress you need to  modify the rte_van_macip struct in the sent mbuf*.
(rte_mbuf.h)
                                       1. add the PKT_TX_VLAN_PKT to the
ol_flags fields.
                                       2. fill the plan_tci in
pkt.vlan_macip.f.vlan_tci

*This is true for dpdk 1.7, structs may have moved in 1.8

On Sat, Dec 20, 2014 at 8:39 PM, Padam Jeet Singh <padam.singh@inventum.net>
wrote:

> Hello,
>
> I have done a simple mbuf adjust and prepend to achieve the removal and
> insertion of the vlan header and it works fine. The use case is something
> similar to the l3fwd example where one port has traffic coming in on
> multiple vlans and the other port has no vlans. The packet processing path
> in the middle inserts or removes the vlan.
>
> Is there an offload flag or mode where this can be done in hardware? Or is
> there a more optimized way to do this in dpdk? For sake of performance I
> want to avoid the copy ethernet header, modify mbuf, copy back the header
> steps.
>
> Thanks,
> Padam
> ---------------------------
> Sent from my mobile. Please excuse the brevity, spelling and punctuation.
>
>