Re: [PATCH bpf-next v3 0/5] Attach a cookie to a tracing program.

[Kui-Feng Lee <kuifeng@fb.com>]

On Fri, 2022-04-08 at 23:33 +0200, Daniel Borkmann wrote:
> On 4/7/22 9:25 PM, Kui-Feng Lee wrote:
> > Allow users to attach a 64-bits cookie to a bpf_link of fentry,
> > fexit,
> > or fmod_ret.
> > 
> > This patchset includes several major changes.
> > 
> >   - Define struct bpf_tramp_links to replace bpf_tramp_prog.
> >     struct bpf_tramp_links collects bpf_links of a trampoline
> > 
> >   - Generate a trampoline to call bpf_progs of given bpf_links.
> > 
> >   - Trampolines always set/reset bpf_run_ctx before/after
> >     calling/leaving a tracing program.
> > 
> >   - Attach a cookie to a bpf_link of fentry/fexit/fmod_ret.  The
> > value
> >     will be available when running the associated bpf_prog.
> > 
> > The major differences from v2:
> > 
> >   - Move the allocations of run_ctx (struct bpf_tramp_run_ctx) out
> > of
> >     invoke_bpf_prog().
> > 
> >   - Move hlist_node out of bpf_link and introduce struct
> > bpf_tramp_link
> >     to own hlist_node.
> > 
> >   - Store cookies at struct bpf_tracing_link.
> > 
> >   - Use SIB byte to reduce the number of instructions to set cookie
> >     values. (Use RSP directly)
> > 
> > v1:
> > https://lore.kernel.org/all/20220126214809.3868787-1-kuifeng@fb.com/
> > v2:
> > https://lore.kernel.org/bpf/20220316004231.1103318-1-kuifeng@fb.com/
> 
> Kui-Feng, would be great if you have a chance to rebase, so that the
> set can
> also go through BPF CI.
> 
> Thanks a lot,
> Daniel
Yes, just sent new patches out.