Add support for io_uring

gradle/libs.versions.toml

@@ -51,6 +51,7 @@ netty-codec-haproxy = { module = "io.netty:netty-codec-haproxy", version.ref = "
 netty-codec-http = { module = "io.netty:netty-codec-http", version.ref = "netty" }
 netty-handler = { module = "io.netty:netty-handler", version.ref = "netty" }
 netty-transport-native-epoll = { module = "io.netty:netty-transport-native-epoll", version.ref = "netty" }
+netty-transport-native-iouring = { module = "io.netty.incubator:netty-incubator-transport-native-io_uring", version = "0.0.24.Final" }
 netty-transport-native-kqueue = { module = "io.netty:netty-transport-native-kqueue", version.ref = "netty" }
 nightconfig = "com.electronwill.night-config:toml:3.6.7"
 slf4j = "org.slf4j:slf4j-api:2.0.7"

proxy/build.gradle.kts

@@ -107,6 +107,9 @@ dependencies {
     implementation(libs.netty.transport.native.epoll)
     implementation(variantOf(libs.netty.transport.native.epoll) { classifier("linux-x86_64") })
     implementation(variantOf(libs.netty.transport.native.epoll) { classifier("linux-aarch_64") })
+    implementation(libs.netty.transport.native.iouring)
+    implementation(variantOf(libs.netty.transport.native.iouring) { classifier("linux-x86_64") })
+    implementation(variantOf(libs.netty.transport.native.iouring) { classifier("linux-aarch_64") })
     implementation(libs.netty.transport.native.kqueue)
     implementation(variantOf(libs.netty.transport.native.kqueue) { classifier("osx-x86_64") })
     implementation(variantOf(libs.netty.transport.native.kqueue) { classifier("osx-aarch_64") })

proxy/src/main/java/com/velocitypowered/proxy/network/ConnectionManager.java

@@ -65,7 +65,7 @@ public final class ConnectionManager {
   private final HttpClient httpClient;
 
   /**
-   * Initalizes the {@code ConnectionManager}.
+   * Initializes the {@code ConnectionManager}.
    *
    * @param server a reference to the Velocity server
    */
@@ -104,7 +104,7 @@ public final class ConnectionManager {
         .childOption(ChannelOption.IP_TOS, 0x18)
         .localAddress(address);
 
-    if (server.getConfiguration().useTcpFastOpen()) {
+    if (transportType != TransportType.NIO && server.getConfiguration().useTcpFastOpen()) {
       bootstrap.option(ChannelOption.TCP_FASTOPEN, 3);
     }
 
@@ -167,7 +167,7 @@ public final class ConnectionManager {
             this.server.getConfiguration().getConnectTimeout())
         .group(group == null ? this.workerGroup : group)
         .resolver(this.resolver.asGroup());
-    if (server.getConfiguration().useTcpFastOpen()) {
+    if (transportType != TransportType.NIO && server.getConfiguration().useTcpFastOpen()) {
       bootstrap.option(ChannelOption.TCP_FASTOPEN_CONNECT, true);
     }
     return bootstrap;

proxy/src/main/java/com/velocitypowered/proxy/network/TransportType.java

@@ -37,6 +37,11 @@ import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioDatagramChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.channel.socket.nio.NioSocketChannel;
+import io.netty.incubator.channel.uring.IOUring;
+import io.netty.incubator.channel.uring.IOUringDatagramChannel;
+import io.netty.incubator.channel.uring.IOUringEventLoopGroup;
+import io.netty.incubator.channel.uring.IOUringServerSocketChannel;
+import io.netty.incubator.channel.uring.IOUringSocketChannel;
 import java.util.concurrent.ThreadFactory;
 import java.util.function.BiFunction;
 
@@ -48,6 +53,10 @@ public enum TransportType {
       NioSocketChannel::new,
       NioDatagramChannel::new,
       (name, type) -> new NioEventLoopGroup(0, createThreadFactory(name, type))),
+  IO_URING("io_uring", IOUringServerSocketChannel::new,
+      IOUringSocketChannel::new,
+      IOUringDatagramChannel::new,
+      (name, type) -> new IOUringEventLoopGroup(0, createThreadFactory(name, type))),
   EPOLL("epoll", EpollServerSocketChannel::new,
       EpollSocketChannel::new,
       EpollDatagramChannel::new,
@@ -98,6 +107,10 @@ public enum TransportType {
       return NIO;
     }
 
+    if (Boolean.getBoolean("velocity.enable-iouring") && IOUring.isAvailable()) {
+      return IO_URING;
+    }
+
     if (Epoll.isAvailable()) {
       return EPOLL;
     }