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Sun, 28 Apr 2024 08:49:56 -0700 (PDT) Received: from localhost ([2601:647:6881:9060:89bd:330c:30be:6758]) by smtp.gmail.com with ESMTPSA id l5-20020a170902d34500b001dd578121d4sm18592101plk.204.2024.04.28.08.49.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 Apr 2024 08:49:55 -0700 (PDT) Date: Sun, 28 Apr 2024 08:49:54 -0700 From: Cong Wang To: Wen Gu Cc: wintera@linux.ibm.com, twinkler@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wenjia@linux.ibm.com, jaka@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH net-next v7 00/11] net/smc: SMC intra-OS shortcut with loopback-ism Message-ID: References: <20240428060738.60843-1-guwen@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240428060738.60843-1-guwen@linux.alibaba.com> On Sun, Apr 28, 2024 at 02:07:27PM +0800, Wen Gu wrote: > This patch set acts as the second part of the new version of [1] (The first > part can be referred from [2]), the updated things of this version are listed > at the end. > > - Background > > SMC-D is now used in IBM z with ISM function to optimize network interconnect > for intra-CPC communications. Inspired by this, we try to make SMC-D available > on the non-s390 architecture through a software-implemented Emulated-ISM device, > that is the loopback-ism device here, to accelerate inter-process or > inter-containers communication within the same OS instance. Just FYI: Cilium has implemented this kind of shortcut with sockmap and sockops. In fact, for intra-OS case, it is _very_ simple. The core code is less than 50 lines. Please take a look here: https://github.com/cilium/cilium/blob/v1.11.4/bpf/sockops/bpf_sockops.c Like I mentioned in my LSF/MM/BPF proposal, we plan to implement similiar eBPF things for inter-OS (aka VM) case. More importantly, even LD_PRELOAD is not needed for this eBPF approach. :) Thanks.