Re: Query on eBPF Map iterator in Kernel space

Sure thanks. I have created a hashmap. I will try with the new
proposed API  long bpf_for_each_map_elem(struct bpf_map *map, void
*callback_fn, void *callback_ctx, u64 flags) from bpf-next repository.

Thanks
Shwetha

On Tue, Mar 2, 2021 at 11:55 AM Y Song <[email protected]> wrote:
>
> On Mon, Mar 1, 2021 at 6:44 AM Toke Høiland-Jørgensen <[email protected]> wrote:
> >
> > Shwetha Vittal <[email protected]> writes:
> >
> > > Hi,
> > >
> > > Is there any way to iterate through eBPF Map elements in kernel space.
> > > I know that there is one at user space bpf_map_get_next_key(). But it
> > > doesn't work when tried in kernel space. I have a requirement to find
> > > the record in the eBPF map which has the least value in kernel space
> > > and pick it for further packet processing and therefore need to
> > > iterate through eBF Map .
> >
> > There will be soon:
> > https://lore.kernel.org/bpf/[email protected]/
>
> What kind of maps are you trying to iterate? The above patch set
> supports hash and array maps. Also, the above patch set has been
> merged into bpf-next repo. Feel free to experiment with it!
>
> >
> > -Toke
> >

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