【微知】Mellanox驱动中UAR是什么？Mkey是什么作用是什么？TPT机制是什么？MPT表是什么？

UAR

UAR（User Access Region），用户访问区域

a memory region that can be mapped directly to an un-trusted application by the OS and can be addressed by non-privileged code
The HCA provides a memory region that can be mapped directly to an un-trusted application by the OS and can be addressed by non-privileged code. This region is used to allow unprivileged applications to access needed HCA resources, such as ringing DoorBells, from userspace. Each process should get a distinct page mapped to this region to access HCA for data path operation, thereby isolating HCA access between the processes

Memory key

网卡设备将VA获取PA是使用memory key的地址空间标识符来处理。

The device translates the given virtual address to a physical address using the given memory key as an address space identifier. Memory protection checks are done in this stage.