netdev - Re: [PATCH 17/39] bpf: resolve_pseudo_ldimm64(): take handling of a single ldimm64 insn into helper

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Message-ID: <20240813020651.GJ13701@ZenIV>
Date: Tue, 13 Aug 2024 03:06:51 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Christian Brauner <brauner@...nel.org>, viro@...nel.org,
	bpf <bpf@...r.kernel.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Amir Goldstein <amir73il@...il.com>,
	"open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
	kvm@...r.kernel.org, Network Development <netdev@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 17/39] bpf: resolve_pseudo_ldimm64(): take handling of a
 single ldimm64 insn into helper

On Mon, Aug 12, 2024 at 01:05:19PM -0700, Andrii Nakryiko wrote:
> On Fri, Aug 9, 2024 at 8:29???PM Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > On Thu, Aug 08, 2024 at 09:51:34AM -0700, Alexei Starovoitov wrote:
> >
> > > The bpf changes look ok and Andrii's approach is easier to grasp.
> > > It's better to route bpf conversion to CLASS(fd,..) via bpf-next,
> > > so it goes through bpf CI and our other testing.
> > >
> > > bpf patches don't seem to depend on newly added CLASS(fd_pos, ...
> > > and fderr, so pretty much independent from other patches.
> >
> > Representation change and switch to accessors do matter, though.
> > OTOH, I can put just those into never-rebased branch (basically,
> > "introduce fd_file(), convert all accessors to it" +
> > "struct fd representation change" + possibly "add struct fd constructors,
> > get rid of __to_fd()", for completeness sake), so you could pull it.
> > Otherwise you'll get textual conflicts on all those f.file vs. fd_file(f)...
> 
> Yep, makes sense. Let's do that, we can merge that branch into
> bpf-next/master and I will follow up with my changes on top of that.
> 
> Let's just drop the do_one_ldimm64() extraction, and keep fdput(f)
> logic, plus add fd_file() accessor changes. I'll then add a switch to
> CLASS(fd) after a bit more BPF-specific clean ups. This code is pretty
> sensitive, so I'd rather have all the non-trivial refactoring done
> separately. Thanks!

Done (#stable-struct_fd); BTW, which tree do you want "convert __bpf_prog_get()
to CLASS(fd)" to go through?