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[PATCH 10/31] FreeBSD OFED support for DPDK MLX5 PMD Adding UIO driver that exposes the synthetic network device resources to userspace for application such as DPDK can drive it. Added rescind CB capability to the VMBUS driver. Whenever the hypervisor wants to close the device channel, VMBUS on receiving this msg, calls the CB of the device driver (hv_uio in our case). Differential revision: https://reviews.freebsd.org/D32184 MFC after: 1 month