Sending A Separate Packet Out The TX Path In XDP

Sending A Separate Packet Out The TX Path In XDP

[Christian Deacon]

Hey everyone,


I had a quick question. Is it possible to send a packet separate from 
the original out of the TX path within an XDP program? I would imagine 
this isn't possible, but I just wanted to make sure.


If this isn't possible within the XDP program itself, is it possible to 
do this with AF_XDP sockets or can AF_XDP sockets only handle packets 
redirected via the fast-path XDP creates? I wasn't sure if I'd need to 
make another Linux socket inside of the AF_XDP program in this case to 
send a separate packet out.


Any help is highly appreciated and thank you for your time.

Re: Sending A Separate Packet Out The TX Path In XDP

[Toke Høiland-Jørgensen]

Christian Deacon <gamemann@gflclan.com> writes:

> Hey everyone,
>
>
> I had a quick question. Is it possible to send a packet separate from 
> the original out of the TX path within an XDP program? I would imagine 
> this isn't possible, but I just wanted to make sure.

Not from within XDP, no...

> If this isn't possible within the XDP program itself, is it possible to 
> do this with AF_XDP sockets or can AF_XDP sockets only handle packets 
> redirected via the fast-path XDP creates? I wasn't sure if I'd need to 
> make another Linux socket inside of the AF_XDP program in this case to 
> send a separate packet out.

...but AF_XDP sockets can send whatever you want :)

-Toke

Re: Sending A Separate Packet Out The TX Path In XDP

[Christian Deacon]

Hey Toke,


That makes sense! I'm going to look into using AF_XDP sockets to achieve 
this.


As always, thank you for all your help!


On 4/27/2021 3:14 PM, Toke Høiland-Jørgensen wrote:
> Christian Deacon <gamemann@gflclan.com> writes:
>
>> Hey everyone,
>>
>>
>> I had a quick question. Is it possible to send a packet separate from
>> the original out of the TX path within an XDP program? I would imagine
>> this isn't possible, but I just wanted to make sure.
> Not from within XDP, no...
>
>> If this isn't possible within the XDP program itself, is it possible to
>> do this with AF_XDP sockets or can AF_XDP sockets only handle packets
>> redirected via the fast-path XDP creates? I wasn't sure if I'd need to
>> make another Linux socket inside of the AF_XDP program in this case to
>> send a separate packet out.
> ...but AF_XDP sockets can send whatever you want :)
>
> -Toke
>

Re: Sending A Separate Packet Out The TX Path In XDP

[Toke Høiland-Jørgensen]

Christian Deacon <gamemann@gflclan.com> writes:

> Hey Toke,
>
>
> That makes sense! I'm going to look into using AF_XDP sockets to achieve 
> this.
>
>
> As always, thank you for all your help!

You're welcome! :)

-Toke