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[78.45.163.186]) by smtp.gmail.com with ESMTPSA id j20sm9610535wre.65.2019.08.30.01.01.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Aug 2019 01:01:32 -0700 (PDT) Date: Fri, 30 Aug 2019 10:01:31 +0200 From: Jiri Pirko To: David Miller Cc: idosch@idosch.org, andrew@lunn.ch, horatiu.vultur@microchip.com, alexandre.belloni@bootlin.com, UNGLinuxDriver@microchip.com, allan.nielsen@microchip.com, ivecera@redhat.com, f.fainelli@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/2] net: core: Notify on changes to dev->promiscuity. Message-ID: <20190830080131.GQ2312@nanopsycho> References: <20190830063624.GN2312@nanopsycho> <20190830.001223.669650763835949848.davem@davemloft.net> <20190830072133.GP2312@nanopsycho> <20190830.003225.292019185488425085.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190830.003225.292019185488425085.davem@davemloft.net> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fri, Aug 30, 2019 at 09:32:25AM CEST, davem@davemloft.net wrote: >From: Jiri Pirko >Date: Fri, 30 Aug 2019 09:21:33 +0200 > >> Fri, Aug 30, 2019 at 09:12:23AM CEST, davem@davemloft.net wrote: >>>From: Jiri Pirko >>>Date: Fri, 30 Aug 2019 08:36:24 +0200 >>> >>>> The promiscuity is a way to setup the rx filter. So promics == rx filter >>>> off. For normal nics, where there is no hw fwd datapath, >>>> this coincidentally means all received packets go to cpu. >>> >>>You cannot convince me that the HW datapath isn't a "rx filter" too, sorry. >> >> If you look at it that way, then we have 2: rx_filter and hw_rx_filter. >> The point is, those 2 are not one item, that is the point I'm trying to >> make :/ > >And you can turn both of them off when I ask for promiscuous mode, that's >a detail of the device not a semantic issue. Well, bridge asks for promiscuous mode during enslave -> hw_rx_filter off When you, want to see all traffic in tcpdump -> rx_filter off So basically there are 2 flavours of promiscuous mode we have to somehow distinguish between, so the driver knows what to do. Nothe that the hw_rx_filter off is not something special to bridge. There is a usecase for this when no bridge is there, only TC filters for example.