(6) drop unused DPDK driver scaffolding

[daniel-noland]

The DPDK driver was stubbed out behind #![cfg(feature = "dpdk")] and the dispatch in runtime.rs already routes the "dpdk" argument through todo!(). Remove the empty drivers/dpdk module, the dpdk cargo feature, the dpdk-sysroot-helper build dependency, and the now-empty build.rs.

The DPDK driver supervisor will be re-introduced from scratch when the DPDK threading model lands.

Predecessor for #1555 (threading rewrite); merge this first.

[Copilot]

Pull request overview

This PR removes the unused dataplane DPDK driver scaffolding and, as part of enabling broader “model-checker friendly” builds, standardizes synchronization primitives behind the concurrency facade while improving cross-arch test execution (qemu-user) and test gating via a shared emulated cfg.

Changes:

• Removed the dataplane DPDK driver module/feature/build-script scaffolding (while keeping dpdk selection routed to todo!()).
• Migrated many crates from direct std::sync::* usage to concurrency::sync::*, and added enforcement (Clippy + Semgrep) plus improved loom/shuttle test infrastructure.
• Added cross-arch test runner plumbing (scripts/test-runner.sh, cargo runner config, emulated cfg), plus Nix/CI updates and dependency pin bumps.

Reviewed changes

Copilot reviewed 99 out of 101 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tracectl/src/control.rs	Switches sync imports to concurrency::sync and simplifies locking calls.
tracectl/Cargo.toml	Adds concurrency dependency for new sync imports.
sysfs/src/lib.rs	Moves LazyLock import to concurrency::sync.
sysfs/Cargo.toml	Adds concurrency dependency.
scripts/test-runner.sh	Adds a cargo runner wrapper to execute tests via qemu-user when needed.
scripts/doc/custom-header.html	Bumps KaTeX CDN URLs to 0.17.0 for rendered docs.
routing/src/router/rio.rs	Uses concurrency::sync::Arc and gates UDS tests on emulated.
routing/src/router/ctl.rs	Uses concurrency::sync::Arc.
routing/src/rib/vrftable.rs	Gates traced_test usage on not(emulated).
routing/src/rib/nexthop.rs	Gates traced_test usage on not(emulated).
routing/src/frr/test.rs	Gates traced_test and ignores flaky/unsupported emulated socket test.
routing/src/fib/test.rs	Moves test threading/atomics to concurrency and adds model-checker-focused tests.
routing/src/config/mod.rs	Gates traced_test usage on not(emulated).
routing/src/cli/handler.rs	Uses concurrency::sync::Arc.
routing/src/atable/resolver.rs	Marks ARP/proc-dependent test ignored under emulated.
routing/Cargo.toml	Adds loom/shuttle feature wiring to concurrency features.
npins/sources.json	Updates KaTeX, rust-overlay, nixpkgs, and dplane-plugin pins/hashes.
nix/profiles.nix	Adds host-arch awareness and emits --cfg=emulated for cross-arch test runs.
nix/pkgs/dplane-plugin/default.nix	Drops a now-unneeded musl compatibility postPatch workaround.
net/src/packet/hash.rs	Reduces test workload under emulated.
nat/src/stateless/test.rs	Gates traced_test usage on not(emulated).
nat/src/stateful/test.rs	Gates traced_test usage on not(emulated).
nat/src/stateful/apalloc/test_alloc.rs	Refactors shuttle/std tests into #[concurrency::test]-driven modules.
nat/src/stateful/apalloc/port_alloc.rs	Uses concurrency::thread::ThreadId and adds loom-deterministic shuffle shim.
nat/src/portfw/test.rs	Gates traced_test usage on not(emulated).
nat/src/portfw/portfwtable/objects.rs	Gates traced_test usage on not(emulated).
nat/src/portfw/portfwtable/access.rs	Gates traced_test usage on not(emulated).
nat/src/lib.rs	Enables arbitrary_self_types under loom for self: Arc<Self> with loom Arc shim.
nat/Cargo.toml	Adds loom feature and simplifies shuttle feature set.
miri.just	Aligns miri runs with --cfg=emulated umbrella.
mgmt/tests/reconcile.rs	Uses concurrency::sync::Arc, gates tracing under emulated, and documents intentional std::sync::Mutex use.
mgmt/src/vpc_manager/mod.rs	Uses concurrency::sync::Arc.
mgmt/src/tests/mgmt.rs	Gates traced_test usage on not(emulated).
mgmt/src/processor/mgmt_client.rs	Uses concurrency::sync::Arc.
mgmt/src/processor/k8s_less_client.rs	Uses concurrency::sync::Arc.
mgmt/src/processor/k8s_client.rs	Uses concurrency::sync::Arc.
mgmt/src/processor/gwconfigdb.rs	Uses concurrency::sync::Arc.
mgmt/src/processor/confbuild/router.rs	Uses concurrency::sync::Arc.
left-right-tlcache/src/lib.rs	Uses concurrency::sync::Mutex in tests and removes unwrap() on locks.
left-right-tlcache/Cargo.toml	Adds concurrency dev-dependency for tests.
k8s-less/src/local.rs	Gates traced_test usage on not(emulated).
k8s-intf/src/client.rs	Uses concurrency::sync::Arc.
k8s-intf/src/bolero/support.rs	Reduces iterations under emulated.
k8s-intf/Cargo.toml	Adds optional concurrency dep to the client feature set.
justfile	Updates nextest filtering logic for loom/shuttle runs.
interface-manager/src/lib.rs	Uses concurrency::sync::Arc.
interface-manager/Cargo.toml	Adds concurrency dependency.
flow-filter/src/tests.rs	Gates traced_test usage on not(emulated).
flow-entry/src/flow_table/table.rs	Avoids timers under loom/shuttle and refactors shuttle tests to #[concurrency::test].
flow-entry/src/flow_table/nf_lookup.rs	Reduces packets under emulated.
flow-entry/Cargo.toml	Adds loom feature and simplifies shuttle feature set.
dpdk/src/acl/mod.rs	Uses concurrency threading primitives in tests.
dpdk/src/acl/config.rs	Adds aarch64 ignore for a bindgen constant discrepancy test.
default.nix	Threads host-arch into profiles and adds qemu-user to build inputs.
dataplane/src/runtime.rs	Extracts dataplane runtime from main.rs and keeps DPDK selection as todo!().
dataplane/src/main.rs	Gates dataplane binary out under loom and delegates to runtime::main().
dataplane/src/drivers/mod.rs	Removes the dpdk driver module export.
dataplane/src/drivers/dpdk.rs	Deletes the unused/empty DPDK driver implementation file.
dataplane/Cargo.toml	Removes default dpdk feature/build dep; adds loom feature for workspace feature resolution.
dataplane/build.rs	Deletes now-empty build script (previously for dpdk sysroot helper).
config/src/utils/collapse.rs	Reduces bolero generator size under emulated.
config/src/gwconfig.rs	Replaces ArcSwap with concurrency::slot::Slot for backend-portable config metadata storage.
config/src/external/overlay/vpcpeering.rs	Uses concurrency::sync::LazyLock for a static empty set.
config/Cargo.toml	Adds concurrency dependency.
concurrency/tests/thread_scope.rs	Updates shuttle gating and allows disallowed types for test internals.
concurrency/tests/stress_dispatch.rs	Adjusts shuttle gating and clarifies dispatch behavior.
concurrency/tests/scope_property.rs	Allows disallowed types for test internals.
concurrency/tests/quiescent_shuttle.rs	Allows disallowed types for test internals.
concurrency/tests/quiescent_protocol.rs	Allows disallowed types for test internals.
concurrency/tests/quiescent_properties.rs	Allows disallowed types for test internals.
concurrency/tests/quiescent_model.rs	Updates shuttle gating semantics around PCT/portfolio behavior.
concurrency/tests/arc_weak.rs	Opts out under shuttle portfolio; allows disallowed types.
concurrency/src/thread/mod.rs	Adds loom spawn with larger stack and provides BuilderExt::spawn_scoped adapter.
concurrency/src/thread/loom_scope.rs	Uses the loom spawn shim from the facade thread module.
concurrency/src/sync/std_backend.rs	Re-exports LazyLock and allows disallowed std sync types inside the facade.
concurrency/src/sync/shuttle_backend.rs	Re-exports std LazyLock/OnceLock with lint allow for shuttle backend.
concurrency/src/sync/parking_lot_backend.rs	Re-exports LazyLock and allows disallowed types inside the facade.
concurrency/src/sync/mod.rs	Updates docs to reflect shuttle portfolio runner behavior.
concurrency/src/sync/loom_backend.rs	Re-exports std LazyLock with lint allow under loom backend.
concurrency/src/stress.rs	Reworks stress dispatch to use shuttle PortfolioRunner and loom stack-size workaround.
concurrency/src/slot.rs	Adds load() convenience methods to match ArcSwap-style APIs across backends.
concurrency/src/quiescent.rs	Allows disallowed types for internal implementation needs.
concurrency/Cargo.toml	Simplifies shuttle feature set and documents portfolio approach.
concurrency-macros/src/lib.rs	Updates #[concurrency::test] expansion for new shuttle backend behavior (single shuttle leaf).
common/src/cliprovider.rs	Uses Slot::load() (instead of load_full()) for CLI providers.
clippy.toml	Disallows direct std::sync::{Mutex,RwLock,...} types to enforce facade usage.
cli/src/cliproto.rs	Ignores UDS test under emulated (miri/qemu-user).
cli/Cargo.toml	Adds concurrency dependency.
cli/bin/terminal.rs	Uses concurrency::sync::Arc.
cli/bin/main.rs	Uses concurrency::sync::Arc.
cli/bin/completions.rs	Uses concurrency::sync::Arc.
Cargo.toml	Bumps netgauze-* and serde_json workspace dependency versions.
Cargo.lock	Updates lockfile for dependency version bumps and graph changes.
.semgrep/rules/no-std-sync-direct.yaml	Adds Semgrep enforcement for avoiding direct std::sync usage.
.gitignore	Ignores qemu-user core dumps.
.github/workflows/lint-opengrep.yml	Configures opengrep to scan with auto + local Semgrep rules.
.github/workflows/dev.yml	Adds cross test execution, refactors model-checker jobs, and surfaces cross failures via sticky PR comment.
.github/workflows/bump.yml	Ensures bump PRs opt into full cross matrix via label.
.github/actions/sticky-pr-comment/action.yml	Adds a composite action for create/update sticky PR comments.
.config/nextest.toml	Adds a cross-qemu nextest profile tuned for qemu-user runs.
.cargo/config.toml	Registers emulated cfg and wires target runners to scripts/test-runner.sh.