Update FreeBSD CI environment

To the latest stable release: 14.3.  And fix the tcp_congestion test:

* On FreeBSD 14 or later, it requires the cc_newreno kernel module to be
  loaded.  By default it is not.

* If newreno happens to be the default, switch to cubic for the second
  part of the test, just as on Linux.

Author: asomers

.cirrus.yml

@@ -1,5 +1,5 @@
 freebsd_instance:
-  image: freebsd-13-2-release-amd64
+  image: freebsd-14-3-release-amd64-ufs
 
 env:
   RUST_BACKTRACE: full
@@ -9,6 +9,7 @@ task:
   setup_script:
     - fetch https://sh.rustup.rs -o rustup.sh
     - sh rustup.sh -y --profile minimal
+    - kldload cc_newreno  # For the tcp_congestion test
   cargo_cache:
     folder: $HOME/.cargo/registry
   build_script:

tests/socket.rs

@@ -1769,23 +1769,29 @@ fn tcp_congestion() {
         "expected {origin_tcp_ca:?} but get {cur_tcp_ca:?}"
     );
     let cur_tcp_ca = cur_tcp_ca.splitn(2, |num| *num == 0).next().unwrap();
-    const OPTIONS: [&[u8]; 2] = [
-        b"cubic",
+    const OPTIONS: [&str; 2] = [
+        "cubic",
         #[cfg(target_os = "linux")]
-        b"reno",
+        "reno",
         #[cfg(target_os = "freebsd")]
-        b"newreno",
+        "newreno",
     ];
     // Set a new tcp ca
-    #[cfg(target_os = "linux")]
-    let new_tcp_ca = if cur_tcp_ca == OPTIONS[0] {
-        OPTIONS[1]
+    let new_tcp_ca = if cur_tcp_ca == OPTIONS[0].as_bytes() {
+        OPTIONS[1].as_bytes()
     } else {
-        OPTIONS[0]
+        OPTIONS[0].as_bytes()
     };
-    #[cfg(target_os = "freebsd")]
-    let new_tcp_ca = OPTIONS[1];
-    socket.set_tcp_congestion(new_tcp_ca).unwrap();
+    if let Err(e) = socket.set_tcp_congestion(new_tcp_ca) {
+        if e.raw_os_error() == Some(libc::ESRCH) {
+            panic!(
+                "Could not set the {:?} CC protocol.  Is the kernel module loaded?",
+                new_tcp_ca
+            );
+        } else {
+            panic!("set_tcp_congestion: {e}");
+        }
+    }
     // Check if new tcp ca is successfully set
     let cur_tcp_ca = socket.tcp_congestion().unwrap();
     assert_eq!(