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Thu, 10 Sep 2026 16:31:30 +0000 Message-ID: <6cd59005-16b9-402f-896e-a031c1e0b20d@suse.de> Date: Thu, 10 Sep 2026 18:30:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/13 net-next] net: ipv4: introduce CONFIG_IPV4 to decouple the IPv4 stack From: Fernando Fernandez Mancera To: netdev@vger.kernel.org Cc: horms@kernel.org, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, davem@davemloft.net, Jason Gunthorpe , Leon Romanovsky , Andrew Lunn , Tony Nguyen , Przemek Kitszel , Elad Nachman , Saeed Mahameed , Tariq Toukan , Mark Bloch , Ido Schimmel , Petr Machata , Edward Cree , Maxime Chevallier , Maxime Coquelin , Alexandre Torgue , Arend van Spriel , Miri Korenblit , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , Saurav Kashyap , Javed Hasan , GR-QLogic-Storage-Upstream@marvell.com, "James E.J. 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Hallyn" , Vikas Gupta , Bhargava Marreddy , Rajashekar Hudumula , Nicolai Buchwitz , =?UTF-8?Q?Markus_Bl=C3=B6chl?= , Arnd Bergmann , Heiner Kallweit , Florian Fainelli , Krzysztof Kozlowski , Qingfang Deng , Julian Braha , Ethan Nelson-Moore , Greg Kroah-Hartman , Eric Biggers , Ard Biesheuvel , Neal Cardwell , Kuniyuki Iwashima , Willem de Bruijn , Alyssa Ross , Joel Granados , Oleg Nesterov , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org, oss-drivers@corigine.com, linux-net-drivers@amd.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org, bridge@lists.linux.dev, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, mptcp@lists.linux.dev, lvs-devel@vger.kernel.org, dev@openvswitch.org, rds-devel@oss.oracle.com, linux-sctp@vger.kernel.org, linux-s390@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-security-module@vger.kernel.org References: <20260910144914.8025-1-fmancera@suse.de> <20260910144914.8025-2-fmancera@suse.de> Content-Language: en-US In-Reply-To: Content-Type: text/plain; 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MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLt8y6wi1bfiy5zg4r6hmh87bb)]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCPT_COUNT_GT_50(0.00)[133]; DWL_DNSWL_BLOCKED(0.00)[suse.de:dkim]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[netdev]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim, suse.de:email, suse.de:mid, imap1.dmz-prg2.suse.org:helo, imap1.dmz-prg2.suse.org:rdns] X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org On 9/10/26 6:22 PM, Fernando Fernandez Mancera wrote: > On 9/10/26 4:48 PM, Fernando Fernandez Mancera wrote: >> Historically, the IPv4 protocol has been linked to the core INET >> subsystem. Because shared infrastructure like the TCP/UDP engine, >> routing or INET hashtables live inside net/ipv4/, it has been impossible >> to compile a kernel with only IPv6 support. >> >> This patch introduces the CONFIG_IPV4 Kconfig symbol, which is set to >> 'def_bool y' for now. This does not allow to completely disable the >> IPv4 stack yet but it lays the necessary build-system work for that >> goal. >> >> In addition, multiple subsystems Kconfig symbols across networking >> features like tunnels, drivers and filesystems have been adjusted to >> depend on IPv4. Keep on mind that follow-up work is required to convert >> the Kconfig symbol to bool and remove the dependency on IPv4 where it >> makes sense. >> >> Signed-off-by: Fernando Fernandez Mancera > FWIW, I just checked and the following symbols that are currently marked > as "depends on IPV4" can already be compiled without IPV4: > > IPV6_MIP6, IPV6_ILA and IPV6_MROUTE > MIP6 depends on XFRM so it actually depends on IPV4 for now. > They will be adjusted on the next revision of the series. A re-check for > all the symbols will be performed. > > Thanks, > Fernando.