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Received: from sslproxy01.your-server.de ([78.46.139.224]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1vBuiG-00051H-29; Thu, 23 Oct 2025 14:46:40 +0200 Received: from localhost ([127.0.0.1]) by sslproxy01.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vBuiF-000Ki2-2A; Thu, 23 Oct 2025 14:46:39 +0200 Message-ID: Date: Thu, 23 Oct 2025 14:46:39 +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 v3 02/15] net: Implement netdev_nl_bind_queue_doit To: Paolo Abeni , netdev@vger.kernel.org Cc: bpf@vger.kernel.org, kuba@kernel.org, davem@davemloft.net, razor@blackwall.org, willemb@google.com, sdf@fomichev.me, john.fastabend@gmail.com, martin.lau@kernel.org, jordan@jrife.io, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, dw@davidwei.uk, toke@redhat.com, yangzhenze@bytedance.com, wangdongdong.6@bytedance.com References: <20251020162355.136118-1-daniel@iogearbox.net> <20251020162355.136118-3-daniel@iogearbox.net> <3b091dc8-47ae-48c2-b7e9-ee3deea6d5e9@redhat.com> 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 1.0.9/27801/Thu Oct 23 11:45:29 2025) On 10/23/25 12:17 PM, Paolo Abeni wrote: > On 10/20/25 6:23 PM, Daniel Borkmann wrote: >> + tmp_rxq = __netif_get_rx_queue(dst_dev, dst_dev->real_num_rx_queues - 1); >> + if (tmp_rxq->peer && tmp_rxq->peer->dev != src_dev) { >> + err = -EOPNOTSUPP; >> + NL_SET_ERR_MSG(info->extack, >> + "Binding multiple queues from difference source devices not supported"); >> + goto err_unlock_src_dev; >> + } > > Why checking a single queue on dst/virtual device? Should the above > check be repeated for all the real_num_rx_queues? We could, but this is actually already enough. For example, initially the device has no phys binding at all (tmp_rxq->peer is NULL). Then we bind the first time. In the second request, we reject tmp_rxq->peer->dev != src_dev, and enforce binding to the same device again as previously, and then it repeats for subsequent bind requests. Thanks, Daniel