On Mon, Jan 13, 2020 at 11:43:02AM +0100, Toke Høiland-Jørgensen wrote: >> Magnus Karlsson <magnus.karlsson@xxxxxxxxx> writes: >>> On Mon, Jan 13, 2020 at 1:28 AM Ryan Goodfellow <rgoodfel@xxxxxxx> wrote: >>> The reason for wanting large memory maps is that our use case for XDP is network >>> emulation - and sometimes that means introducing delay factors that can require >>> a rather large in-memory packet buffers. >>> >>> If there is interest in including this program in the official BPF samples I'm happy to >>> submit a patch. Any comments on the program are also much appreciated. >> >> More examples are always useful, but the question is if it should >> reside in samples or outside the kernel in some other repo? Is there >> some good place in xdp-project github that could be used for this >> purpose? > > We could certainly create something; either a new xdp-samples > repository, or an example-programs/ subdir of the xdp-tutorial? Which of > those makes the most sense depends on the size of the program I think... > > -Toke > I'm happy to provide patches or pull-requests in either case. The userspace program is 1 file with 555 lines and the BPF program is 28 lines. I've tested the userspace program with the 5.5 kernel. The BPF program requires clang-9 to work properly (due to BTF features IIRC). - https://gitlab.com/mergetb/tech/network-emulation/kernel/blob/v5.5-moa/samples/bpf/xdpsock_multidev.c - https://gitlab.com/mergetb/tech/network-emulation/kernel/blob/v5.5-moa/samples/bpf/xdpsock_multidev_kern.c The primary usefulness of this program relative to what's out there is that it pushes packets between interfaces using a common memory map. -- ~ ry
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