pub use gemachain_perf::packet::NUM_RCVMMSGS;
use {
crate::packet::Packet,
std::{cmp, io, net::UdpSocket},
};
#[cfg(target_os = "linux")]
use {
itertools::izip,
libc::{iovec, mmsghdr, sockaddr_storage, socklen_t, AF_INET, AF_INET6, MSG_WAITFORONE},
nix::sys::socket::InetAddr,
std::{mem, os::unix::io::AsRawFd},
};
#[cfg(not(target_os = "linux"))]
pub fn recv_mmsg(socket: &UdpSocket, packets: &mut [Packet]) -> io::Result<(usize, usize)> {
let mut i = 0;
let count = cmp::min(NUM_RCVMMSGS, packets.len());
let mut total_size = 0;
for p in packets.iter_mut().take(count) {
p.meta.size = 0;
match socket.recv_from(&mut p.data) {
Err(_) if i > 0 => {
break;
}
Err(e) => {
return Err(e);
}
Ok((nrecv, from)) => {
total_size += nrecv;
p.meta.size = nrecv;
p.meta.set_addr(&from);
if i == 0 {
socket.set_nonblocking(true)?;
}
}
}
i += 1;
}
Ok((total_size, i))
}
#[cfg(target_os = "linux")]
fn cast_socket_addr(addr: &sockaddr_storage, hdr: &mmsghdr) -> Option<InetAddr> {
use libc::{sa_family_t, sockaddr_in, sockaddr_in6};
const SOCKADDR_IN_SIZE: usize = std::mem::size_of::<sockaddr_in>();
const SOCKADDR_IN6_SIZE: usize = std::mem::size_of::<sockaddr_in6>();
if addr.ss_family == AF_INET as sa_family_t
&& hdr.msg_hdr.msg_namelen == SOCKADDR_IN_SIZE as socklen_t
{
let addr = addr as *const _ as *const sockaddr_in;
return Some(unsafe { InetAddr::V4(*addr) });
}
if addr.ss_family == AF_INET6 as sa_family_t
&& hdr.msg_hdr.msg_namelen == SOCKADDR_IN6_SIZE as socklen_t
{
let addr = addr as *const _ as *const sockaddr_in6;
return Some(unsafe { InetAddr::V6(*addr) });
}
error!(
"recvmmsg unexpected ss_family:{} msg_namelen:{}",
addr.ss_family, hdr.msg_hdr.msg_namelen
);
None
}
#[cfg(target_os = "linux")]
#[allow(clippy::uninit_assumed_init)]
pub fn recv_mmsg(sock: &UdpSocket, packets: &mut [Packet]) -> io::Result<(usize, usize)> {
const SOCKADDR_STORAGE_SIZE: usize = mem::size_of::<sockaddr_storage>();
let mut hdrs: [mmsghdr; NUM_RCVMMSGS] = unsafe { mem::zeroed() };
let mut iovs: [iovec; NUM_RCVMMSGS] = unsafe { mem::MaybeUninit::uninit().assume_init() };
let mut addrs: [sockaddr_storage; NUM_RCVMMSGS] = unsafe { mem::zeroed() };
let sock_fd = sock.as_raw_fd();
let count = cmp::min(iovs.len(), packets.len());
for (packet, hdr, iov, addr) in
izip!(packets.iter_mut(), &mut hdrs, &mut iovs, &mut addrs).take(count)
{
*iov = iovec {
iov_base: packet.data.as_mut_ptr() as *mut libc::c_void,
iov_len: packet.data.len(),
};
hdr.msg_hdr.msg_name = addr as *mut _ as *mut _;
hdr.msg_hdr.msg_namelen = SOCKADDR_STORAGE_SIZE as socklen_t;
hdr.msg_hdr.msg_iov = iov;
hdr.msg_hdr.msg_iovlen = 1;
}
let mut ts = libc::timespec {
tv_sec: 1,
tv_nsec: 0,
};
let nrecv =
unsafe { libc::recvmmsg(sock_fd, &mut hdrs[0], count as u32, MSG_WAITFORONE, &mut ts) };
if nrecv < 0 {
return Err(io::Error::last_os_error());
}
let mut npkts = 0;
addrs
.iter()
.zip(hdrs)
.take(nrecv as usize)
.filter_map(|(addr, hdr)| {
let addr = cast_socket_addr(addr, &hdr)?.to_std();
Some((addr, hdr))
})
.zip(packets.iter_mut())
.for_each(|((addr, hdr), pkt)| {
pkt.meta.size = hdr.msg_len as usize;
pkt.meta.set_addr(&addr);
npkts += 1;
});
let total_size = packets.iter().take(npkts).map(|pkt| pkt.meta.size).sum();
Ok((total_size, npkts))
}
#[cfg(test)]
mod tests {
use crate::packet::PACKET_DATA_SIZE;
use crate::recvmmsg::*;
use std::net::{SocketAddr, UdpSocket};
use std::time::{Duration, Instant};
type TestConfig = (UdpSocket, SocketAddr, UdpSocket, SocketAddr);
fn test_setup_reader_sender(ip_str: &str) -> io::Result<TestConfig> {
let reader = UdpSocket::bind(ip_str)?;
let addr = reader.local_addr()?;
let sender = UdpSocket::bind(ip_str)?;
let saddr = sender.local_addr()?;
Ok((reader, addr, sender, saddr))
}
const TEST_NUM_MSGS: usize = 32;
#[test]
pub fn test_recv_mmsg_one_iter() {
let test_one_iter = |(reader, addr, sender, saddr): TestConfig| {
let sent = TEST_NUM_MSGS - 1;
for _ in 0..sent {
let data = [0; PACKET_DATA_SIZE];
sender.send_to(&data[..], &addr).unwrap();
}
let mut packets = vec![Packet::default(); TEST_NUM_MSGS];
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(sent, recv);
for packet in packets.iter().take(recv) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr);
}
};
test_one_iter(test_setup_reader_sender("127.0.0.1:0").unwrap());
match test_setup_reader_sender("::1:0") {
Ok(config) => test_one_iter(config),
Err(e) => warn!("Failed to configure IPv6: {:?}", e),
}
}
#[test]
pub fn test_recv_mmsg_multi_iter() {
let test_multi_iter = |(reader, addr, sender, saddr): TestConfig| {
let sent = TEST_NUM_MSGS + 10;
for _ in 0..sent {
let data = [0; PACKET_DATA_SIZE];
sender.send_to(&data[..], &addr).unwrap();
}
let mut packets = vec![Packet::default(); TEST_NUM_MSGS];
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(TEST_NUM_MSGS, recv);
for packet in packets.iter().take(recv) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr);
}
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(sent - TEST_NUM_MSGS, recv);
for packet in packets.iter().take(recv) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr);
}
};
test_multi_iter(test_setup_reader_sender("127.0.0.1:0").unwrap());
match test_setup_reader_sender("::1:0") {
Ok(config) => test_multi_iter(config),
Err(e) => warn!("Failed to configure IPv6: {:?}", e),
}
}
#[test]
pub fn test_recv_mmsg_multi_iter_timeout() {
let reader = UdpSocket::bind("127.0.0.1:0").expect("bind");
let addr = reader.local_addr().unwrap();
reader.set_read_timeout(Some(Duration::new(5, 0))).unwrap();
reader.set_nonblocking(false).unwrap();
let sender = UdpSocket::bind("127.0.0.1:0").expect("bind");
let saddr = sender.local_addr().unwrap();
let sent = TEST_NUM_MSGS;
for _ in 0..sent {
let data = [0; PACKET_DATA_SIZE];
sender.send_to(&data[..], &addr).unwrap();
}
let start = Instant::now();
let mut packets = vec![Packet::default(); TEST_NUM_MSGS];
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(TEST_NUM_MSGS, recv);
for packet in packets.iter().take(recv) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr);
}
reader.set_nonblocking(true).unwrap();
let _recv = recv_mmsg(&reader, &mut packets[..]);
assert!(start.elapsed().as_secs() < 5);
}
#[test]
pub fn test_recv_mmsg_multi_addrs() {
let reader = UdpSocket::bind("127.0.0.1:0").expect("bind");
let addr = reader.local_addr().unwrap();
let sender1 = UdpSocket::bind("127.0.0.1:0").expect("bind");
let saddr1 = sender1.local_addr().unwrap();
let sent1 = TEST_NUM_MSGS - 1;
let sender2 = UdpSocket::bind("127.0.0.1:0").expect("bind");
let saddr2 = sender2.local_addr().unwrap();
let sent2 = TEST_NUM_MSGS + 1;
for _ in 0..sent1 {
let data = [0; PACKET_DATA_SIZE];
sender1.send_to(&data[..], &addr).unwrap();
}
for _ in 0..sent2 {
let data = [0; PACKET_DATA_SIZE];
sender2.send_to(&data[..], &addr).unwrap();
}
let mut packets = vec![Packet::default(); TEST_NUM_MSGS];
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(TEST_NUM_MSGS, recv);
for packet in packets.iter().take(sent1) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr1);
}
for packet in packets.iter().skip(sent1).take(recv - sent1) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr2);
}
let recv = recv_mmsg(&reader, &mut packets[..]).unwrap().1;
assert_eq!(sent1 + sent2 - TEST_NUM_MSGS, recv);
for packet in packets.iter().take(recv) {
assert_eq!(packet.meta.size, PACKET_DATA_SIZE);
assert_eq!(packet.meta.addr(), saddr2);
}
}
}