Merge pull request #7 from shutton/optional-gro

Make enabling GRO optional

src/unix.rs

@@ -116,6 +116,17 @@ impl UdpSocket {
  self.io.set_broadcast(broadcast)
  }
 
+ /// Opportunistically try to enable GRO support for this socket. This is
+ /// only supported on Linux platforms.
+ #[cfg(target_os = "linux")]
+ pub fn set_gro(&self, enable: bool) -> io::Result<()> {
+ // See gro::gro_segments().
+ const OPTION_OFF: libc::c_int = 0;
+
+ let value = if enable { OPTION_ON } else { OPTION_OFF };
+ set_socket_option(&self.io, libc::SOL_UDP, libc::UDP_GRO, value)
+ }
+
  pub async fn connect<A: ToSocketAddrs>(&self, addrs: A) -> io::Result<()> {
  self.io.connect(addrs).await
  }
@@ -609,9 +620,6 @@ fn init(io: SockRef<'_>) -> io::Result<()> {
  }
  #[cfg(target_os = "linux")]
  {
- // opportunistically try to enable GRO. See gro::gro_segments().
- let _ = set_socket_option(&*io, libc::SOL_UDP, libc::UDP_GRO, OPTION_ON);
-
  // Forbid IPv4 fragmentation. Set even for IPv6 to account for IPv6 mapped IPv4 addresses.
  set_socket_option(
  &*io,