netdev - Re: [PATCH bpf-next v3 0/4] net/smc: Introduce BPF injection capability

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Date:   Tue, 28 Feb 2023 19:24:28 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     "D. Wythe" <alibuda@...ux.alibaba.com>, kgraul@...ux.ibm.com,
        wenjia@...ux.ibm.com, jaka@...ux.ibm.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-rdma@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 0/4] net/smc: Introduce BPF injection
 capability

On Wed, 1 Mar 2023 10:41:57 +0800 Tony Lu wrote:
> Actually, this patch set is going to replace the patch of TCP ULP for
> SMC. If this patch set is accepted, I am going to revert that patch.
> 
> For the reasons, the TCP ULP for SMC doesn't use wildly. It's not
> possible to know which applications are suitable to be replaced with
> SMC. But it's easier to detect the behavior of applications and
> determine whether to replace applications with SMC. And this patch set
> is going to fallback to TCP by behavior with eBPF.
> 
> So this is the _fix_ for that patch.

Good to hear, I was worried you'd still want to install the ULP at some
point whether the decision is via BPF or user space.