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sigverify_stage.rs
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sigverify_stage.rs
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//! The `sigverify_stage` implements the signature verification stage of the TPU. It
//! receives a list of lists of packets and outputs the same list, but tags each
//! top-level list with a list of booleans, telling the next stage whether the
//! signature in that packet is valid. It assumes each packet contains one
//! transaction. All processing is done on the CPU by default and on a GPU
//! if perf-libs are available
use {
crate::sigverify,
crossbeam_channel::{SendError, Sender as CrossbeamSender},
itertools::Itertools,
solana_measure::measure::Measure,
solana_perf::packet::PacketBatch,
solana_perf::sigverify::Deduper,
solana_sdk::timing,
solana_streamer::streamer::{self, PacketBatchReceiver, StreamerError},
std::{
sync::mpsc::{Receiver, RecvTimeoutError},
thread::{self, Builder, JoinHandle},
time::Instant,
},
thiserror::Error,
};
const MAX_SIGVERIFY_BATCH: usize = 10_000;
#[derive(Error, Debug)]
pub enum SigVerifyServiceError {
#[error("send packets batch error")]
Send(#[from] SendError<Vec<PacketBatch>>),
#[error("streamer error")]
Streamer(#[from] StreamerError),
}
type Result<T> = std::result::Result<T, SigVerifyServiceError>;
pub struct SigVerifyStage {
thread_hdl: JoinHandle<()>,
}
pub trait SigVerifier {
fn verify_batches(&self, batches: Vec<PacketBatch>) -> Vec<PacketBatch>;
}
#[derive(Default, Clone)]
pub struct DisabledSigVerifier {}
#[derive(Default)]
struct SigVerifierStats {
recv_batches_us_hist: histogram::Histogram, // time to call recv_batch
verify_batches_pp_us_hist: histogram::Histogram, // per-packet time to call verify_batch
discard_packets_pp_us_hist: histogram::Histogram, // per-packet time to call verify_batch
dedup_packets_pp_us_hist: histogram::Histogram, // per-packet time to call verify_batch
batches_hist: histogram::Histogram, // number of packet batches per verify call
packets_hist: histogram::Histogram, // number of packets per verify call
total_batches: usize,
total_packets: usize,
total_dedup: usize,
total_excess_fail: usize,
}
impl SigVerifierStats {
fn report(&self) {
datapoint_info!(
"sigverify_stage-total_verify_time",
(
"recv_batches_us_90pct",
self.recv_batches_us_hist.percentile(90.0).unwrap_or(0),
i64
),
(
"recv_batches_us_min",
self.recv_batches_us_hist.minimum().unwrap_or(0),
i64
),
(
"recv_batches_us_max",
self.recv_batches_us_hist.maximum().unwrap_or(0),
i64
),
(
"recv_batches_us_mean",
self.recv_batches_us_hist.mean().unwrap_or(0),
i64
),
(
"verify_batches_pp_us_90pct",
self.verify_batches_pp_us_hist.percentile(90.0).unwrap_or(0),
i64
),
(
"verify_batches_pp_us_min",
self.verify_batches_pp_us_hist.minimum().unwrap_or(0),
i64
),
(
"verify_batches_pp_us_max",
self.verify_batches_pp_us_hist.maximum().unwrap_or(0),
i64
),
(
"verify_batches_pp_us_mean",
self.verify_batches_pp_us_hist.mean().unwrap_or(0),
i64
),
(
"discard_packets_pp_us_90pct",
self.discard_packets_pp_us_hist
.percentile(90.0)
.unwrap_or(0),
i64
),
(
"discard_packets_pp_us_min",
self.discard_packets_pp_us_hist.minimum().unwrap_or(0),
i64
),
(
"discard_packets_pp_us_max",
self.discard_packets_pp_us_hist.maximum().unwrap_or(0),
i64
),
(
"discard_packets_pp_us_mean",
self.discard_packets_pp_us_hist.mean().unwrap_or(0),
i64
),
(
"dedup_packets_pp_us_90pct",
self.dedup_packets_pp_us_hist.percentile(90.0).unwrap_or(0),
i64
),
(
"dedup_packets_pp_us_min",
self.dedup_packets_pp_us_hist.minimum().unwrap_or(0),
i64
),
(
"dedup_packets_pp_us_max",
self.dedup_packets_pp_us_hist.maximum().unwrap_or(0),
i64
),
(
"dedup_packets_pp_us_mean",
self.dedup_packets_pp_us_hist.mean().unwrap_or(0),
i64
),
(
"batches_90pct",
self.batches_hist.percentile(90.0).unwrap_or(0),
i64
),
("batches_min", self.batches_hist.minimum().unwrap_or(0), i64),
("batches_max", self.batches_hist.maximum().unwrap_or(0), i64),
("batches_mean", self.batches_hist.mean().unwrap_or(0), i64),
(
"packets_90pct",
self.packets_hist.percentile(90.0).unwrap_or(0),
i64
),
("packets_min", self.packets_hist.minimum().unwrap_or(0), i64),
("packets_max", self.packets_hist.maximum().unwrap_or(0), i64),
("packets_mean", self.packets_hist.mean().unwrap_or(0), i64),
("total_batches", self.total_batches, i64),
("total_packets", self.total_packets, i64),
("total_dedup", self.total_dedup, i64),
("total_excess_fail", self.total_excess_fail, i64),
);
}
}
impl SigVerifier for DisabledSigVerifier {
fn verify_batches(&self, mut batches: Vec<PacketBatch>) -> Vec<PacketBatch> {
sigverify::ed25519_verify_disabled(&mut batches);
batches
}
}
impl SigVerifyStage {
#[allow(clippy::new_ret_no_self)]
pub fn new<T: SigVerifier + 'static + Send + Clone>(
packet_receiver: Receiver<PacketBatch>,
verified_sender: CrossbeamSender<Vec<PacketBatch>>,
verifier: T,
) -> Self {
let thread_hdl = Self::verifier_services(packet_receiver, verified_sender, verifier);
Self { thread_hdl }
}
pub fn discard_excess_packets(batches: &mut [PacketBatch], mut max_packets: usize) {
// Group packets by their incoming IP address.
let mut addrs = batches
.iter_mut()
.rev()
.flat_map(|batch| batch.packets.iter_mut().rev())
.filter(|packet| !packet.meta.discard())
.map(|packet| (packet.meta.addr, packet))
.into_group_map();
// Allocate max_packets evenly across addresses.
while max_packets > 0 && !addrs.is_empty() {
let num_addrs = addrs.len();
addrs.retain(|_, packets| {
let cap = (max_packets + num_addrs - 1) / num_addrs;
max_packets -= packets.len().min(cap);
packets.truncate(packets.len().saturating_sub(cap));
!packets.is_empty()
});
}
// Discard excess packets from each address.
for packet in addrs.values_mut().flatten() {
packet.meta.discard = true;
}
}
fn verifier<T: SigVerifier>(
deduper: &Deduper,
recvr: &PacketBatchReceiver,
sendr: &CrossbeamSender<Vec<PacketBatch>>,
verifier: &T,
stats: &mut SigVerifierStats,
) -> Result<()> {
let (mut batches, num_packets, recv_time) = streamer::recv_batch(recvr)?;
let batches_len = batches.len();
debug!(
"@{:?} verifier: verifying: {}",
timing::timestamp(),
num_packets,
);
let mut dedup_time = Measure::start("sigverify_dedup_time");
let dedup_fail = deduper.dedup_packets(&mut batches) as usize;
dedup_time.stop();
let num_unique = num_packets.saturating_sub(dedup_fail);
let mut discard_time = Measure::start("sigverify_discard_time");
if num_unique > MAX_SIGVERIFY_BATCH {
Self::discard_excess_packets(&mut batches, MAX_SIGVERIFY_BATCH)
};
let excess_fail = num_unique.saturating_sub(MAX_SIGVERIFY_BATCH);
discard_time.stop();
let mut verify_batch_time = Measure::start("sigverify_batch_time");
let batches = verifier.verify_batches(batches);
sendr.send(batches)?;
verify_batch_time.stop();
debug!(
"@{:?} verifier: done. batches: {} total verify time: {:?} verified: {} v/s {}",
timing::timestamp(),
batches_len,
verify_batch_time.as_ms(),
num_packets,
(num_packets as f32 / verify_batch_time.as_s())
);
datapoint_debug!(
"sigverify_stage-total_verify_time",
("num_batches", batches_len, i64),
("num_packets", num_packets, i64),
("verify_time_ms", verify_batch_time.as_ms(), i64),
("recv_time", recv_time, i64),
);
stats
.recv_batches_us_hist
.increment(recv_time as u64)
.unwrap();
stats
.verify_batches_pp_us_hist
.increment(verify_batch_time.as_us() / (num_packets as u64))
.unwrap();
stats
.discard_packets_pp_us_hist
.increment(discard_time.as_us() / (num_packets as u64))
.unwrap();
stats
.dedup_packets_pp_us_hist
.increment(dedup_time.as_us() / (num_packets as u64))
.unwrap();
stats.batches_hist.increment(batches_len as u64).unwrap();
stats.packets_hist.increment(num_packets as u64).unwrap();
stats.total_batches += batches_len;
stats.total_packets += num_packets;
stats.total_dedup += dedup_fail;
stats.total_excess_fail += excess_fail;
Ok(())
}
fn verifier_service<T: SigVerifier + 'static + Send + Clone>(
packet_receiver: PacketBatchReceiver,
verified_sender: CrossbeamSender<Vec<PacketBatch>>,
verifier: &T,
) -> JoinHandle<()> {
let verifier = verifier.clone();
let mut stats = SigVerifierStats::default();
let mut last_print = Instant::now();
const MAX_DEDUPER_AGE_MS: u64 = 2_000;
const MAX_DEDUPER_ITEMS: u32 = 1_000_000;
Builder::new()
.name("solana-verifier".to_string())
.spawn(move || {
let mut deduper = Deduper::new(MAX_DEDUPER_ITEMS, MAX_DEDUPER_AGE_MS);
loop {
deduper.reset();
if let Err(e) = Self::verifier(
&deduper,
&packet_receiver,
&verified_sender,
&verifier,
&mut stats,
) {
match e {
SigVerifyServiceError::Streamer(StreamerError::RecvTimeout(
RecvTimeoutError::Disconnected,
)) => break,
SigVerifyServiceError::Streamer(StreamerError::RecvTimeout(
RecvTimeoutError::Timeout,
)) => (),
SigVerifyServiceError::Send(_) => {
break;
}
_ => error!("{:?}", e),
}
}
if last_print.elapsed().as_secs() > 2 {
stats.report();
stats = SigVerifierStats::default();
last_print = Instant::now();
}
}
})
.unwrap()
}
fn verifier_services<T: SigVerifier + 'static + Send + Clone>(
packet_receiver: PacketBatchReceiver,
verified_sender: CrossbeamSender<Vec<PacketBatch>>,
verifier: T,
) -> JoinHandle<()> {
Self::verifier_service(packet_receiver, verified_sender, &verifier)
}
pub fn join(self) -> thread::Result<()> {
self.thread_hdl.join()
}
}
#[cfg(test)]
mod tests {
use {super::*, solana_perf::packet::Packet};
fn count_non_discard(packet_batches: &[PacketBatch]) -> usize {
packet_batches
.iter()
.map(|batch| {
batch
.packets
.iter()
.map(|p| if p.meta.discard { 0 } else { 1 })
.sum::<usize>()
})
.sum::<usize>()
}
#[test]
fn test_packet_discard() {
solana_logger::setup();
let mut batch = PacketBatch::default();
batch.packets.resize(10, Packet::default());
batch.packets[3].meta.addr = std::net::IpAddr::from([1u16; 8]);
batch.packets[3].meta.set_discard(true);
batch.packets[4].meta.addr = std::net::IpAddr::from([2u16; 8]);
let mut batches = vec![batch];
let max = 3;
SigVerifyStage::discard_excess_packets(&mut batches, max);
assert_eq!(count_non_discard(&batches), max);
assert!(!batches[0].packets[0].meta.discard());
assert!(batches[0].packets[3].meta.discard());
assert!(!batches[0].packets[4].meta.discard());
}
}