linux_mptcp_94: 0.94.4 -> 0.94.6

Also move to a pkgs/os-specific/linux/kernel/linux-mptcp-94.nix. makes
updates easier.
Added a structured config pkgs/os-specific/linux/kernel/mptcp-config.nix
that can be shared between the different kernels.

pkgs/os-specific/linux/kernel/linux-mptcp-94.nix

···
+{ stdenv, buildPackages, fetchFromGitHub, perl, buildLinux, structuredExtraConfig ? {}, ... } @ args:
+let
+  mptcpVersion = "0.94.6";
+  modDirVersion = "4.14.127";
+in
+buildLinux ({
+  version = "${modDirVersion}-mptcp_v${mptcpVersion}";
+  inherit modDirVersion;
+
+  extraMeta = {
+    branch = "4.4";
+    maintainers = with stdenv.lib.maintainers; [ teto layus ];
+  };
+
+  src = fetchFromGitHub {
+    owner = "multipath-tcp";
+    repo = "mptcp";
+    rev = "v${mptcpVersion}";
+    sha256 = "071cx9205wpzhi5gc2da79w2abs3czd60jg0xml7j1szc5wl4yfn";
+  };
+
+  structuredExtraConfig = stdenv.lib.mkMerge [
+    (import ./mptcp-config.nix { inherit stdenv; })
+    structuredExtraConfig
+  ];
+} // args)

pkgs/os-specific/linux/kernel/linux-mptcp.nix

···
-{ stdenv, buildPackages, fetchFromGitHub, perl, buildLinux, structuredExtraConfig ? {}, ... } @ args:
-let
-  mptcpVersion = "0.94.4";
-  modDirVersion = "4.14.110";
-in
-buildLinux ({
-  version = "${modDirVersion}-mptcp_v${mptcpVersion}";
-  inherit modDirVersion;
-
-  extraMeta = {
-    branch = "4.4";
-    maintainers = with stdenv.lib.maintainers; [ teto layus ];
-  };
-
-  src = fetchFromGitHub {
-    owner = "multipath-tcp";
-    repo = "mptcp";
-    rev = "v${mptcpVersion}";
-    sha256 = "1ng6p1djhm3m5g44yyq7gpqqbzsnhm9rimsafp5g4dx8cm27a70f";
-  };
-
-  structuredExtraConfig = with import ../../../../lib/kernel.nix { inherit (stdenv) lib; version = null; };
-    stdenv.lib.mkMerge [ {
-    IPV6               = yes;
-    MPTCP              = yes;
-    IP_MULTIPLE_TABLES = yes;
-
-    # Enable advanced path-managers...
-    MPTCP_PM_ADVANCED = yes;
-    MPTCP_FULLMESH = yes;
-    MPTCP_NDIFFPORTS = yes;
-    # ... but use none by default.
-    # The default is safer if source policy routing is not setup.
-    DEFAULT_DUMMY = yes;
-    DEFAULT_MPTCP_PM.freeform = "default";
-
-    # MPTCP scheduler selection.
-    MPTCP_SCHED_ADVANCED = yes;
-    DEFAULT_MPTCP_SCHED.freeform = "default";
-
-    # Smarter TCP congestion controllers
-    TCP_CONG_LIA = module;
-    TCP_CONG_OLIA = module;
-    TCP_CONG_WVEGAS = module;
-    TCP_CONG_BALIA = module;
-  }
-  structuredExtraConfig
-  ];
-} // args)

pkgs/os-specific/linux/kernel/mptcp-config.nix

···
+{ stdenv }:
+with import ../../../../lib/kernel.nix { inherit (stdenv) lib; version = null; };
+{
+    # DRM_AMDGPU = yes;
+
+    IPV6               = yes;
+    MPTCP              = yes;
+    IP_MULTIPLE_TABLES = yes;
+
+    # Enable advanced path-managers...
+    MPTCP_PM_ADVANCED = yes;
+    MPTCP_FULLMESH = yes;
+    MPTCP_NDIFFPORTS = yes;
+    # ... but use none by default.
+    # The default is safer if source policy routing is not setup.
+    DEFAULT_DUMMY = yes;
+    DEFAULT_MPTCP_PM.freeform = "default";
+
+    # MPTCP scheduler selection.
+    MPTCP_SCHED_ADVANCED = yes;
+    DEFAULT_MPTCP_SCHED.freeform = "default";
+
+    # Smarter TCP congestion controllers
+    TCP_CONG_LIA = module;
+    TCP_CONG_OLIA = module;
+    TCP_CONG_WVEGAS = module;
+    TCP_CONG_BALIA = module;
+}

pkgs/top-level/all-packages.nix

···
   klibcShrunk = lowPrio (callPackage ../os-specific/linux/klibc/shrunk.nix { });
 
   linux_mptcp = linux_mptcp_94;
-  linux_mptcp_94 = callPackage ../os-specific/linux/kernel/linux-mptcp.nix {
+  linux_mptcp_94 = callPackage ../os-specific/linux/kernel/linux-mptcp-94.nix {
     kernelPatches =
       [ kernelPatches.bridge_stp_helper
         kernelPatches.cpu-cgroup-v2."4.11"