Revert "Prioritize non-slices over slices"

This reverts commit 14499f01.

Reason for revert: b/312408745

Change-Id: I8b03799fe6e0e256263240909ee7446c178bf508

service/src/com/android/server/connectivity/NetworkRanker.java

@@ -17,8 +17,6 @@
 package com.android.server.connectivity;
 
 import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL;
-import static android.net.NetworkCapabilities.NET_CAPABILITY_PRIORITIZE_BANDWIDTH;
-import static android.net.NetworkCapabilities.NET_CAPABILITY_PRIORITIZE_LATENCY;
 import static android.net.NetworkCapabilities.TRANSPORT_BLUETOOTH;
 import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
 import static android.net.NetworkCapabilities.TRANSPORT_ETHERNET;
@@ -222,19 +220,6 @@ public class NetworkRanker {
                 accepted, rejected);
     }
 
-    /**
-     * Returns whether the scorable has any of the PRIORITIZE_* capabilities.
-     *
-     * These capabilities code for customer slices, and a network that has one is a customer slice.
-     */
-    private boolean hasPrioritizedCapability(@NonNull final Scoreable nai) {
-        final NetworkCapabilities caps = nai.getCapsNoCopy();
-        final long anyPrioritizeCapability =
-                (1L << NET_CAPABILITY_PRIORITIZE_LATENCY)
-                | (1L << NET_CAPABILITY_PRIORITIZE_BANDWIDTH);
-        return 0 != (caps.getCapabilitiesInternal() & anyPrioritizeCapability);
-    }
-
     /**
      * Get the best network among a list of candidates according to policy.
      * @param candidates the candidates
@@ -339,12 +324,6 @@ public class NetworkRanker {
         // change from the previous result. If there were, it's guaranteed candidates.size() > 0
         // because accepted.size() > 0 above.
 
-        // If any network is not a slice with prioritized bandwidth or latency, don't choose one
-        // that is.
-        partitionInto(candidates, nai -> !hasPrioritizedCapability(nai), accepted, rejected);
-        if (accepted.size() == 1) return accepted.get(0);
-        if (accepted.size() > 0 && rejected.size() > 0) candidates = new ArrayList<>(accepted);
-
         // If some of the networks have a better transport than others, keep only the ones with
         // the best transports.
         for (final int transport : PREFERRED_TRANSPORTS_ORDER) {

tests/unit/java/com/android/server/connectivity/NetworkRankerTest.kt

@@ -18,12 +18,9 @@ package com.android.server.connectivity
 
 import android.net.NetworkCapabilities
 import android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL as NET_CAP_PORTAL
-import android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET as NET_CAP_INTERNET
-import android.net.NetworkCapabilities.NET_CAPABILITY_PRIORITIZE_BANDWIDTH as NET_CAP_PRIO_BW
 import android.net.NetworkCapabilities.TRANSPORT_CELLULAR
 import android.net.NetworkCapabilities.TRANSPORT_WIFI
 import android.net.NetworkScore.KEEP_CONNECTED_NONE
-import android.net.NetworkScore.POLICY_TRANSPORT_PRIMARY
 import android.net.NetworkScore.POLICY_EXITING as EXITING
 import android.net.NetworkScore.POLICY_TRANSPORT_PRIMARY as PRIMARY
 import android.net.NetworkScore.POLICY_YIELD_TO_BAD_WIFI as YIELD_TO_BAD_WIFI
@@ -53,8 +50,8 @@ private fun caps(transport: Int, vararg capabilities: Int) =
 class NetworkRankerTest(private val activelyPreferBadWifi: Boolean) {
     private val mRanker = NetworkRanker(NetworkRanker.Configuration(activelyPreferBadWifi))
 
-    private class TestScore(private val sc: FullScore, private val nc: NetworkCapabilities) :
-            NetworkRanker.Scoreable {
+    private class TestScore(private val sc: FullScore, private val nc: NetworkCapabilities)
+            : NetworkRanker.Scoreable {
         override fun getScore() = sc
         override fun getCapsNoCopy(): NetworkCapabilities = nc
     }
@@ -199,41 +196,4 @@ class NetworkRankerTest(private val activelyPreferBadWifi: Boolean) {
         val badExitingWifi = TestScore(score(EVER_EVALUATED, EVER_VALIDATED, EXITING), CAPS_WIFI)
         assertEquals(cell, rank(cell, badExitingWifi))
     }
-
-    @Test
-    fun testValidatedPolicyStrongerThanSlice() {
-        val unvalidatedNonslice = TestScore(score(EVER_EVALUATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET))
-        val slice = TestScore(score(EVER_EVALUATED, IS_VALIDATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET, NET_CAP_PRIO_BW))
-        assertEquals(slice, rank(slice, unvalidatedNonslice))
-    }
-
-    @Test
-    fun testPrimaryPolicyStrongerThanSlice() {
-        val nonslice = TestScore(score(EVER_EVALUATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET))
-        val primarySlice = TestScore(score(EVER_EVALUATED, POLICY_TRANSPORT_PRIMARY),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET, NET_CAP_PRIO_BW))
-        assertEquals(primarySlice, rank(nonslice, primarySlice))
-    }
-
-    @Test
-    fun testPreferNonSlices() {
-        // Slices lose to non-slices for general ranking
-        val nonslice = TestScore(score(EVER_EVALUATED, IS_VALIDATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET))
-        val slice = TestScore(score(EVER_EVALUATED, IS_VALIDATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET, NET_CAP_PRIO_BW))
-        assertEquals(nonslice, rank(slice, nonslice))
-    }
-
-    @Test
-    fun testSlicePolicyStrongerThanTransport() {
-        val nonSliceCell = TestScore(score(EVER_EVALUATED, IS_VALIDATED),
-                caps(TRANSPORT_CELLULAR, NET_CAP_INTERNET))
-        val sliceWifi = TestScore(score(EVER_EVALUATED, IS_VALIDATED),
-                caps(TRANSPORT_WIFI, NET_CAP_INTERNET, NET_CAP_PRIO_BW))
-        assertEquals(nonSliceCell, rank(nonSliceCell, sliceWifi))
-    }
 }