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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 3/26/19 3:03 PM, Vladimir Oltean wrote: > On 3/26/19 4:31 AM, Florian Fainelli wrote: >> >> >> On 3/23/2019 8:23 PM, Vladimir Oltean wrote: >>> In order to support this, we are creating a make-shift switch tag out of >>> a VLAN trunk configured on the CPU port. Termination on switch ports >>> only works when not under a vlan_filtering bridge. We are making use of >>> the generic CONFIG_NET_DSA_TAG_8021Q code and leveraging it from our own >>> CONFIG_NET_DSA_TAG_SJA1105. >>> >>> There are two types of traffic: regular and link-local. >>> The link-local traffic received on the CPU port is trapped from the >>> switch's regular forwarding decisions because it matched one of the two >>> DMAC filters for management traffic. >>> On transmission, the switch requires special massaging for these >>> link-local frames. Due to a weird implementation of the switching IP, by >>> default it drops link-local frames that originate on the CPU port. It >>> needs to be told where to forward them to, through an SPI command >>> ("management route") that is valid for only a single frame. >>> So when we're sending link-local traffic, we need to clone skb's from >>> DSA and send them in our custom xmit worker that also performs SPI >>> access. >>> >>> For that purpose, the DSA xmit handler and the xmit worker communicate >>> through a per-port "skb ring" software structure, with a producer and a >>> consumer index. At the moment this structure is rather fragile >>> (ping-flooding to a link-local DMAC would cause most of the frames to >>> get dropped). I would like to move the management traffic on a separate >>> netdev queue that I can stop when the skb ring got full and hardware is >>> busy processing, so that we are not forced to drop traffic. >>> >>> Signed-off-by: Vladimir Oltean >> >> Reviewed-by: Florian Fainelli >> >> I do like the idea of setting up specific management queue later on, >> although it is not clear to me how you would go about integrating it as >> a network device, given the DSA slave and master devices, do you know >> roughly how you would proceed? >> > > Actually I was thinking about leveraging the multiqueue support that you > added in 55199df6d2af ("net: dsa: Allow switch drivers to indicate > number of TX queues") and expose the slave netdev .ndo_select_queue > callback towards DSA ports. There I would return queue #0 if > sja1105_is_link_local(skb), and queue #1 otherwise. > Are there any complications that I'm missing? So that queue could be used to steer management traffic, but it would still attempt to perform a dev_queue_xmit() using the master DSA network device unless you somehow change that and/or parent that queue to a different network device that the sja1105 switch driver creates (which is doable). -- Florian