Add support for RAT-based TCP buffer sizes

If the RAT-based resource overlay is not set,
config_tcp_buffers will be used instead.

Test: atest FrameworksTelephonyTests
Bug: 222323543
Change-Id: I55ccb2a2f0b2408e97aa851b5a6e77cf2abac9f2

2 files changed, 12 insertions, 7 deletions

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 94eb45cab8d6..e1b7a0c08cb3 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -2693,23 +2693,27 @@
          rat-name:rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max
          If no value is found for the rat-name in use, the system default will be applied.
 
-         This is deprecated. Please use config_tcp_buffers.
+         This is deprecated. Please use config_mobile_tcp_buffers for rat-based TCP buffers sizes or
+         config_tcp_buffers for rat-independent TCP buffer sizes.
     -->
     <string-array name="config_mobile_tcp_buffers">
     </string-array>
 
+    <!-- Configure tcp buffer sizes per network type in the form:
+         network-type:rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max
+
+         The network-type must be a valid DataConfigNetworkType value. If no value is found for the
+         network-type in use, config_tcp_buffers will be used instead.
+    -->
+    <string-array name="config_network_type_tcp_buffers">
+    </string-array>
+
     <!-- Configure tcp buffer sizes in the form:
          rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max
          If this is configured as an empty string, the system default will be applied.
 
          For now this config is used by mobile data only. In the future it should be
          used by Wi-Fi as well.
-
-         Note that starting from Android 13, the TCP buffer size is fixed after boot up, and should
-         never be changed based on carriers or the network types. The value should be configured
-         appropriately based on the device's memory and performance. It is recommended to use lower
-         values if the device has low memory or doesn't support high-speed network such like LTE,
-         NR, or Wifi.
     -->
     <string name="config_tcp_buffers" translatable="false"></string>
 
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index bb9142a56db3..94c9a122ee75 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -472,6 +472,7 @@
   <java-symbol type="integer" name="config_safe_media_volume_usb_mB" />
   <java-symbol type="integer" name="config_mobile_mtu" />
   <java-symbol type="array"   name="config_mobile_tcp_buffers" />
+  <java-symbol type="array"   name="config_network_type_tcp_buffers" />
   <java-symbol type="string"  name="config_tcp_buffers" />
   <java-symbol type="bool" name="config_force_enable_telephony_new_data_stack" />
   <java-symbol type="integer" name="config_volte_replacement_rat"/>