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snapshot: Remove max_connections and max_pending_resets fields #4913

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Merged
merged 2 commits into from
Nov 14, 2024
Merged

snapshot: Remove max_connections and max_pending_resets fields #4913

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5809687
snapshot: Remove max_connections and max_pending_resets fields
zulinx86 Nov 13, 2024
762ed4f
test(mmds): Do not use MmdsNetworkStack::new() in tests
zulinx86 Nov 13, 2024
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4 changes: 4 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,10 @@ and this project adheres to

### Changed

- [#4913](https://github.com/firecracker-microvm/firecracker/pull/4913): Removed
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Not opposing the change, but what are customers supposed to do in response to this?

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Good point, they need to regenerate a snapshot. We might want to apply the same fix for the previous change.

unnecessary fields (`max_connections` and `max_pending_resets`) from the
snapshot format, bumping the snapshot version to 5.0.0.

### Deprecated

### Removed
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15 changes: 3 additions & 12 deletions src/vmm/src/mmds/ns.rs
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Expand Up @@ -81,8 +81,6 @@ impl MmdsNetworkStack {
mac_addr: MacAddr,
ipv4_addr: Ipv4Addr,
tcp_port: u16,
max_connections: NonZeroUsize,
max_pending_resets: NonZeroUsize,
mmds: Arc<Mutex<Mmds>>,
) -> Self {
MmdsNetworkStack {
Expand All @@ -93,8 +91,8 @@ impl MmdsNetworkStack {
tcp_handler: TcpIPv4Handler::new(
ipv4_addr,
tcp_port,
max_connections,
max_pending_resets,
NonZeroUsize::new(DEFAULT_MAX_CONNECTIONS).unwrap(),
NonZeroUsize::new(DEFAULT_MAX_PENDING_RESETS).unwrap(),
),
mmds,
}
Expand All @@ -105,14 +103,7 @@ impl MmdsNetworkStack {
let ipv4_addr = mmds_ipv4_addr.unwrap_or_else(|| Ipv4Addr::from(DEFAULT_IPV4_ADDR));

// The unwrap()s are safe because the given literals are greater than 0.
Self::new(
mac_addr,
ipv4_addr,
DEFAULT_TCP_PORT,
NonZeroUsize::new(DEFAULT_MAX_CONNECTIONS).unwrap(),
NonZeroUsize::new(DEFAULT_MAX_PENDING_RESETS).unwrap(),
mmds,
)
Self::new(mac_addr, ipv4_addr, DEFAULT_TCP_PORT, mmds)
}

pub fn set_ipv4_addr(&mut self, ipv4_addr: Ipv4Addr) {
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15 changes: 0 additions & 15 deletions src/vmm/src/mmds/persist.rs
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Expand Up @@ -4,7 +4,6 @@
//! Defines the structures needed for saving/restoring MmdsNetworkStack.

use std::net::Ipv4Addr;
use std::num::NonZeroUsize;
use std::sync::{Arc, Mutex};

use serde::{Deserialize, Serialize};
Expand All @@ -20,8 +19,6 @@ pub struct MmdsNetworkStackState {
mac_addr: [u8; MAC_ADDR_LEN as usize],
ipv4_addr: u32,
tcp_port: u16,
max_connections: NonZeroUsize,
max_pending_resets: NonZeroUsize,
}

impl Persist<'_> for MmdsNetworkStack {
Expand All @@ -37,8 +34,6 @@ impl Persist<'_> for MmdsNetworkStack {
mac_addr,
ipv4_addr: self.ipv4_addr.into(),
tcp_port: self.tcp_handler.local_port(),
max_connections: self.tcp_handler.max_connections(),
max_pending_resets: self.tcp_handler.max_pending_resets(),
}
}

Expand All @@ -50,8 +45,6 @@ impl Persist<'_> for MmdsNetworkStack {
MacAddr::from_bytes_unchecked(&state.mac_addr),
Ipv4Addr::from(state.ipv4_addr),
state.tcp_port,
state.max_connections,
state.max_pending_resets,
mmds,
))
}
Expand Down Expand Up @@ -83,13 +76,5 @@ mod tests {
restored_ns.tcp_handler.local_port(),
ns.tcp_handler.local_port()
);
assert_eq!(
restored_ns.tcp_handler.max_connections(),
ns.tcp_handler.max_connections()
);
assert_eq!(
restored_ns.tcp_handler.max_pending_resets(),
ns.tcp_handler.max_pending_resets()
);
}
}
2 changes: 1 addition & 1 deletion src/vmm/src/persist.rs
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Expand Up @@ -157,7 +157,7 @@ pub enum CreateSnapshotError {
}

/// Snapshot version
pub const SNAPSHOT_VERSION: Version = Version::new(4, 0, 0);
pub const SNAPSHOT_VERSION: Version = Version::new(5, 0, 0);

/// Creates a Microvm snapshot.
pub fn create_snapshot(
Expand Down