Re: XDP multi-buffer and AF_XDP

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On Fri, Apr 01, 2022 at 09:52:02AM -0400, eric@xxxxxxxx wrote:
> On Fri, Apr 01, 2022 at 01:26:12PM +0000, Karlsson, Magnus wrote:
> > 
> > 
> > > -----Original Message-----
> > > From: Jesper Dangaard Brouer <jbrouer@xxxxxxxxxx>
> > > Sent: Friday, April 1, 2022 3:13 PM
> > > To: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>; Kal Cutter Conley
> > > <kal.conley@xxxxxxxxxxx>; Xdp <xdp-newbies@xxxxxxxxxxxxxxx>
> > > Cc: Brouer, Jesper <brouer@xxxxxxxxxx>; Lorenzo Bianconi
> > > <lorenzo.bianconi@xxxxxxxxxx>; Karlsson, Magnus
> > > <magnus.karlsson@xxxxxxxxx>; eric.david.sage@xxxxxxxxx
> > > Subject: Re: XDP multi-buffer and AF_XDP
> > > 
> > > 
> > > On 01/04/2022 13.39, Toke Høiland-Jørgensen wrote:
> > > > Kal Cutter Conley <kal.conley@xxxxxxxxxxx> writes:
> > > >
> > > >>>
> > > >>> Hi,
> > > >>> We are very interested in receiving jumbo frames (> 8000 bytes) over
> > > >>> AF_XDP. Does XDP multi-buffer support XDP_REDIRECT with AF_XDP?
> > > What
> > > >>> about in zero-copy mode?
> > > >>>
> > > >>> Cheers,
> > > >>> Kal
> > > >>
> > > >> Looking into this more I found this comment in the mlx5 driver:
> > > >>
> > > >> /* Don't enable multi buffer on XDP_REDIRECT SQ, as it's not yet
> > > >> * supported by upstream, and there is no defined trigger to allow
> > > >> * transmitting redirected multi-buffer frames.
> > > >> */
> > > >>
> > > >> So at least mlx5 does not yet support XDP multi-buffer with
> > > >> XDP_REDIRECT. What "upstream" support is required to get
> > > XDP_REDIRECT
> > > >> to work with XSKs?
> > > >
> > > > Well, the initial patch set for multibuf explicitly blocked
> > > > XDP_REDIRECT between interfaces, which is what that comment is
> > > > referring to (the TX side).
> > > >
> > > > For AF_XDP we'd also need to define the UAPI, and maybe add a socket
> > > > flag so the userspace program can signal to the kernel that it
> > > > understands it? Not sure about the details.
> > > >
> > > > You're definitely not the only person who wants this, though; adding
> > > > in some people who may have a better idea of the exact steps needed.
> > > 
> > > Cc. Eric Sage, as he also expressed interest in implementing this...
> > 
> > Adding Tirtha that has patches for the AF_XDP support of multi-buffer.
> > Though, he is currently integrating his i40e multi-buffer driver
> > support with Lorenzo's TX-patches that he sent as an RFC. Latest I
> > heard is that Tirtha is planning on submitting this in a couple of
> > weeks as a proper patch to the mailing list. And after that, the focus
> > is to brush up the AF_XDP and ZC support patches as we stopped trying
> > to track Lorenzo's multi-buffer patches at version 13 out of 23 ;-).
> > We just could not keep up.
> 
> Ah, if there is anything I can do to help please let me know. My company needs this
> feature so I can work on it full time. I would love to help out however I can.

Hey Eric! We'll keep you in loop in terms of progress around this work.

> 
> Thanks,
> Eric Sage
> > 
> > > --Jesper
> > 



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