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Received: from sslproxy04.your-server.de ([78.46.152.42]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1v38e1-000FJu-1s; Mon, 29 Sep 2025 09:50:01 +0200 Received: from localhost ([127.0.0.1]) by sslproxy04.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1v38e0-000K2r-2K; Mon, 29 Sep 2025 09:50:00 +0200 Message-ID: Date: Mon, 29 Sep 2025 09:50:00 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 16/20] netkit: Implement rtnl_link_ops->alloc To: Jordan Rife Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, kuba@kernel.org, davem@davemloft.net, razor@blackwall.org, pabeni@redhat.com, willemb@google.com, sdf@fomichev.me, john.fastabend@gmail.com, martin.lau@kernel.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, David Wei References: <20250919213153.103606-1-daniel@iogearbox.net> <20250919213153.103606-17-daniel@iogearbox.net> <3yy7htlhsx2c2v7jkoh23iywiwacxdb3y7qpr2s5hwjw3zazhb@kivqcblixanb> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.0.9/27776/Sun Sep 28 10:26:36 2025) On 9/27/25 3:17 AM, Jordan Rife wrote: > On Fri, Sep 19, 2025 at 11:31:49PM +0200, Daniel Borkmann wrote: >> From: David Wei >> >> Implement rtnl_link_ops->alloc that allows the number of rx queues to be >> set when netkit is created. By default, netkit has only a single rxq (and >> single txq). The number of queues is deliberately not allowed to be changed >> via ethtool -L and is fixed for the lifetime of a netkit instance. >> >> For netkit device creation, numrxqueues with larger than one rxq can be >> specified. These rxqs are then mappable to real rxqs in physical netdevs: >> >> ip link add numrxqueues 2 type netkit >> >> As a starting point, the limit of numrxqueues for netkit is currently set >> to 2, but future work is going to allow mapping multiple real rxqs from > > Is the reason for the limit just because QEMU can't take advantage of > more today or is there some other technical limitation? Mainly just to keep the initial series smaller, plan is to lift this to more queues for both io_uring and af_xdp. QEMU supports multiple queues for af_xdp but when I spoke to QEMU folks, there is still the issue that QEMU internally needs to be able to support processing inbound traffic through multiple threads so its not a backend but QEMU internal limitation atm. >> physical netdevs, potentially at some point even from different physical >> netdevs. > > What would be the use case for having proxied queues from multiple > physical netdevs to the same netkit device? Couldn't you just create > multiple netkit devices, one per physical device? Yes, multiple netkit devices would work as well in that case.