11/06/2021 07:14, Xia, Chenbo: > From: Thomas Monjalon <tho...@monjalon.net> > > 10/06/2021 12:33, Ferruh Yigit: > > > On 5/27/2021 2:37 PM, Xueming Li wrote: > > > > SubFunction [1] is a portion of the PCI device, a SF netdev has its > > own > > > > dedicated queues(txq, rxq). A SF shares PCI level resources with other > > > > SFs and/or with its parent PCI function. Auxiliary bus is the > > > > fundamental of SF. > > > > > > > > This patch set introduces SubFunction support for mlx5 PMD driver > > > > including class net, regex, vdpa and compress. > > > > > > > > > > There is already an mdev patch, originated from long ago. Aren't > > subfunctions > > > presented as mdev device? If so can't we use mdev for it? > > > > No unfortunately that's different. > > mlx5 SF is based on top of auxiliary bus in the kernel/sysfs. > > Just out of curiosity: > > Does SF use mdev before aux bus is introduced in kernel. I see some history > of it but am not sure: [1] seems SF was base on mdev. [2] seems BlueField > software v2.5 is using mdev for SF. I saw it yesterday and try to figure > out the history. Since you are here, guess you know something 😊 > > [1] > https://patchwork.ozlabs.org/project/netdev/cover/20191107160448.20962-1-pa...@mellanox.com/ > [2] https://docs.mellanox.com/display/BlueFieldSWv25011176/Mediated+Devices
Kernel maintainers rejected the use of mdev for this purpose and suggested to use a real bus. You can follow the discussion here: https://lore.kernel.org/netdev/20191108205204.gb1277...@kroah.com/ Does Intel plan to use mdev for SF? For the sake of follow-up discussion, this is the official mdev doc: https://www.kernel.org/doc/Documentation/vfio-mediated-device.txt
