Add toggle for default TCP algorithm (#210)

* Make YEAH default

closes #172

* Make default TCP algorithm choice a config toggle

* Add Vegas TCP algorithm, fix westwood

* Simplify TCP alg choice code

* tcp algs: fix mistake from copy-pasta

customization.cfg

@@ -189,6 +189,12 @@ _aggressive_ondemand="true"
 # https://github.com/Tk-Glitch/PKGBUILDS/issues/263
 _disable_acpi_cpufreq=""
 
+# [Advanced] Default TCP IPv4 algorithm to use. Options are: "yeah", "bbr", "cubic", "reno", "vegas" and "westwood". Leave empty if unsure.
+# This config option will not be prompted
+# Can be changed at runtime with the command line `# echo "$name" > /proc/sys/net/ipv4/tcp_congestion_control` where $name is one of the options above.
+# Default (empty) and fallback : cubic
+_tcp_cong_alg=""
+
 # You can pass a default set of kernel command line options here - example: "intel_pstate=passive nowatchdog amdgpu.ppfeaturemask=0xfffd7fff mitigations=off"
 _custom_commandline="intel_pstate=passive"
 

linux-tkg-config/prepare

@@ -742,6 +742,31 @@ CONFIG_DEBUG_INFO_BTF_MODULES=y\n
     sed -i -e 's/CONFIG_DEBUG_PREEMPT=y/# CONFIG_DEBUG_PREEMPT is not set/' ./.config
   fi
 
+  # TCP algorithms
+  _tcp_cong_alg_list=("yeah" "bbr" "cubic" "vegas" "westwood" "reno")
+  _user_set_tcp_alg="false"
+
+  ./scripts/config --enable TCP_CONG_ADVANCED
+
+  for _alg in "${_tcp_cong_alg_list[@]}"
+  do
+    ./scripts/config --enable TCP_CONG_${_alg}
+    ./scripts/config --disable DEFAULT_${_alg}
+    if [ "$_tcp_cong_alg" = "$_alg" ];then
+      _user_set_tcp_alg="true"
+      ./scripts/config --enable DEFAULT_${_alg}
+      ./scripts/config --set-str DEFAULT_TCP_CONG "${_alg}"
+    fi
+  done
+
+  if [ "$_user_set_tcp_alg" = "false" ];then
+    ./scripts/config --enable DEFAULT_CUBIC
+    ./scripts/config --set-str DEFAULT_TCP_CONG "cubic"
+  fi
+
+  #######
+
+
   if [ "${_cpusched}" = "MuQSS" ]; then
     # MuQSS default config
     echo "CONFIG_SCHED_MUQSS=y" >> ./.config