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[2a10:fc81:a806:d6a9::1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432d286cdecsm32857157f8f.7.2026.01.13.14.13.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 14:13:21 -0800 (PST) Date: Tue, 13 Jan 2026 23:13:20 +0100 From: Stefano Brivio To: David Gibson Subject: Re: [PATCH 1/3] conf: Introduce --no-bindtodevice option for testing Message-ID: <20260113231320.7d9781c2@elisabeth> In-Reply-To: References: <20260105082850.1985300-1-david@gibson.dropbear.id.au> <20260105082850.1985300-2-david@gibson.dropbear.id.au> <20260111003314.2e24f648@elisabeth> <20260113011201.05a80cb7@elisabeth> Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.49; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: p-M-DsyDsRSllubX_LKm6fnpWIHb6IQBHQsKMkkoSPA_1768342403 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID-Hash: QPJWT7HTFCT4LNT5K3YKZ23YEPDRH5TU X-Message-ID-Hash: QPJWT7HTFCT4LNT5K3YKZ23YEPDRH5TU X-MailFrom: sbrivio@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: passt-dev@passt.top X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Tue, 13 Jan 2026 14:00:18 +1100 David Gibson wrote: > On Tue, Jan 13, 2026 at 01:12:01AM +0100, Stefano Brivio wrote: > > On Mon, 12 Jan 2026 14:42:39 +1100 > > David Gibson wrote: > > > > > On Sun, Jan 11, 2026 at 12:33:14AM +0100, Stefano Brivio wrote: > > > > > > > I never really understood the point of --no-splice, as there was no > > > > user request whatsoever behind it, but fine, the argument was that it > > > > added some needed functionality, even though I couldn't quite grasp > > > > which one it was. > > > > > > That was never the argument from _me_ for --no-splice. For me it was > > > always that it was useful for development / testing / debugging, not > > > that it was (directly) useful to end users. > > > > Right, I think Jon meant it was useful to end users. Otherwise, I would > > have argued, it should be mentioned in the man page, and, I would have > > argued further, the option shouldn't exist at all. > > > > > That's true in at least > > > two ways: > > > * Allows testing non-splice functionality without having to either > > > use passt or create some non-loopback addresses > > > > ...but without a loopback address we can't use the tap path anyway. > > I'm not sure what you mean here. Oops, I meant to say "without a loopback address you can't use the spliced path anyway". > If I want to exercise something on > the tap path I can use: > $ pasta --no-splice [whatever else] > [...] > $ socat STDIO TCP:localhost:12345 > > and I don't need to look up my host's current global IP. Ah, right, sorry! That's the bit of functionality it actually adds. I keep forgetting about it. This wasn't possible before. -- Stefano