Re: Redirect from NIC to TAP
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- Subject: Re: Redirect from NIC to TAP
- From: David Ahern <dsahern@xxxxxxxxx>
- Date: Tue, 9 Feb 2021 21:30:39 -0700
- In-reply-to: <20210209094137.GA14290@ranger.igk.intel.com>
- References: <CAM-scZPPeu44FeCPGO=Qz=03CrhhfB1GdJ8FNEpPqP_G27c6mQ@mail.gmail.com> <20210209102118.476f507d@carbon> <CAM-scZNLN5cgJBEdVFSSrLJi3zW-5THzbY=diESdKiiisCT9MQ@mail.gmail.com> <20210209094137.GA14290@ranger.igk.intel.com>
- User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.7.0
On 2/9/21 2:41 AM, Maciej Fijalkowski wrote:
> On Tue, Feb 09, 2021 at 11:26:06AM +0200, Radu Stoenescu wrote:
>> Hello
>>
>> My physical NIC is a Netronome (I can come back with exact model type
>> and driver version).
>>
>> Redirect NIC to TAP doesn't work when XDP is attached in driver mode.
>> It works when they are both in generic mode. I haven't tried other
>> combinations of attachment modes (one driver, other generic etc.).
>
If the driver supports XDP_REDIRECT, it does work.
Take a look at this slide deck for gotcha's with this use case:
https://netdevconf.info/0x14/pub/slides/24/netdev-0x14-XDP-and-the-cloud.pdf
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