On 26.08.24 16:24, Andrew Lunn wrote: > On Mon, Aug 26, 2024 at 11:06:09AM +0200, Dragos Tatulea wrote: >> >> >> On 23.08.24 18:54, Carlos Bilbao wrote: >>> 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. >> mlx5_vdpa vDPA devicess currently do not support the VIRTIO_NET_F_SPEED_DUPLEX >> feature which reports speed and duplex. You can check the state on the >> PF. > > Then it should probably report DUPLEX_UNKNOWN. > > The speed of 0 also suggests SPEED_UNKNOWN is not being returned. So > this just looks buggy in general. > The virtio spec doesn't mention what those values should be when VIRTIO_NET_F_SPEED_DUPLEX is not supported. Jason, should vdpa_dev_net_config_fill() initialize the speed/duplex fields to SPEED/DUPLEX_UNKNOWN instead of 0? Thanks, Dragos
