Port new freebsd stack stable release 12.x

[soroshsabz]

ITNOA

I think it is good to port to new FreeBSD release 12.1 for minor improvement in tcp/ip stack

[soroshsabz]

@suyuexin ?

[jfb8856606]

Currently we won't to port FreeBD 12.x, unless there are more changes to the tcp/ip stack, such as BBR.
And we will follow the improvements in new versions, such as critical vulnerability or others, but F-Stack not follow the modified of IPFW and RACK currently.

[Retia-Adolf]

Actually, they had already added BBR several months ago: https://reviews.freebsd.org/D21582

[jfb8856606]

Yes, i has seen this differential before, but we still need to wait for it to release, then we will update F-Stack in branch dev.

[jeff-lv-github]

Currently we won't to port FreeBD 12.x, unless there are more changes to the tcp/ip stack, such as BBR. And we will follow the improvements in new versions, such as critical vulnerability or others, but F-Stack not follow the modified of IPFW and RACK currently.

I am trying to porting the f-stack to arm64 and met some problems in ff_freebsd_init().
Could you share the experience of poring freebsd to x86?

[jfb8856606]

F-Stack has support FreeBSD-13.0, and RACK/BBR, close this issue.