netdev - Re: [PATCH v2 bpf-next 0/8] bpf: Allow bpf tcp iter to do bpf

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Message-ID: <20210706154416.v63cvb6ylr5cnyxo@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 6 Jul 2021 08:44:16 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     David Laight <David.Laight@...LAB.COM>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "kernel-team@...com" <kernel-team@...com>,
        Neal Cardwell <ncardwell@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH v2 bpf-next 0/8] bpf: Allow bpf tcp iter to do
 bpf_(get|set)sockopt

On Fri, Jul 02, 2021 at 10:50:43AM +0000, David Laight wrote:
> From: Martin KaFai Lau
> > Sent: 01 July 2021 21:06
> > 
> > This set is to allow bpf tcp iter to call bpf_(get|set)sockopt.
> 
> How does that work at all?
> 
> IIRC only setsockopt() was converted so that it is callable
> with a kernel buffer.
> The corresponding change wasn't done to getsockopt().
It calls _bpf_getsockopt which does not depend on sys_getsockopt.