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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7308ac1a373sm4641127b3a.41.2025.02.11.16.37.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Feb 2025 16:37:38 -0800 (PST) Date: Tue, 11 Feb 2025 16:37:35 -0800 From: Stephen Hemminger To: Jakub Kicinski Cc: longli@linuxonhyperv.com, Jason Gunthorpe , Leon Romanovsky , Ajay Sharma , Konstantin Taranov , "David S. Miller" , Eric Dumazet , Paolo Abeni , linux-rdma@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, Long Li Subject: Re: [PATCH net-next v3] hv_netvsc: Set device flags for properly indicating bonding in Hyper-V Message-ID: <20250211163735.18d0fd02@hermes.local> In-Reply-To: <20250211162026.593b0b93@kernel.org> References: <1738965337-23085-1-git-send-email-longli@linuxonhyperv.com> <20250211162026.593b0b93@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 11 Feb 2025 16:20:26 -0800 Jakub Kicinski wrote: > On Fri, 7 Feb 2025 13:55:37 -0800 longli@linuxonhyperv.com wrote: > > On Hyper-V platforms, a slave VF netdev always bonds to Netvsc and remains > > as Netvsc's only active slave as long as the slave device is present. This > > behavior is the same as a bonded device, but it's not user-configurable. > > > > Some kernel APIs (e.g those in "include/linux/netdevice.h") check for > > IFF_MASTER, IFF_SLAVE and IFF_BONDING for determing if those are used in > > a master/slave bonded setup. Netvsc's bonding setup with its slave device > > falls into this category. > > Again, this is way too much of a hack. You're trying to make > netif_is_bond_master() return true for your franken-interfaces > with minimal effort. Agree but disagree as to reasoning. The way bonding is handled in the kernel internal API's is ad-hoc. Really a better solution is needed. The real problem is in any code (other than the bonding driver itself) looking at IFF_BONDING is broken. All that code won't work if used over team or failover devices (luckily no one ever seems to use them).