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([2603:8080:7400:36da:45f:f211:3a7c:9377]) by smtp.gmail.com with ESMTPSA id 3f1490d57ef6-e178e4406b0sm720032276.12.2024.08.23.09.54.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Aug 2024 09:54:15 -0700 (PDT) Message-ID: <33feec1a-2c5d-46eb-8d66-baa802130d7f@digitalocean.com> Date: Fri, 23 Aug 2024 11:54:13 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: eli@mellanox.com, mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, dtatulea@nvidia.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, kvm@vger.kernel.org, eperezma@redhat.com, sashal@kernel.org, yuehaibing@huawei.com, steven.sistare@oracle.com From: Carlos Bilbao Subject: [RFC] Why is set_config not supported in mlx5_vnet? Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello, I'm debugging my vDPA setup, and when using ioctl to retrieve the configuration, I noticed that it's running in half duplex mode: Configuration data (24 bytes):   MAC address: (Mac address)   Status: 0x0001   Max virtqueue pairs: 8   MTU: 1500   Speed: 0 Mb   Duplex: Half Duplex   RSS max key size: 0   RSS max indirection table length: 0   Supported hash types: 0x00000000 I believe this might be contributing to the underperformance of vDPA. While looking into how to change this option for Mellanox, I read the following kernel code in mlx5_vnet.c: static void mlx5_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, const void *buf,                  unsigned int len) {     /* not supported */ } I was wondering why this is the case. Is there another way for me to change these configuration settings? Thank you in advance, Carlos