Cleaned-up discusion start roughly at message 263 Qualcomm Fast Path For LEDE - #263 by dissent1
and continues e.g. until 420 Qualcomm Fast Path For LEDE - #420 by dissent1
The dissent1 patch as a pull request:
https://github.com/lede-project/source/pull/1269/commits/b87b4734c6e56fa45ec612350e2aa480ed2d8dd6
(and the patch itself can be downloaded as https://github.com/lede-project/source/pull/1269/commits/b87b4734c6e56fa45ec612350e2aa480ed2d8dd6.patch )
But I haven't tested building it myself lately.