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. -Toke
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