[thweetkomputer]

DPDK's netvsc event-buffer expansion leaks the old allocation when rte_realloc() fails. Vendor the fix under third_party/patches/dpdk/ and apply it before Bycorf configures and compiles DPDK, so source builds include the fix automatically.

Group dependency patches under third_party/patches/<dependency>/, moving the existing FreeBSD TCP patch unchanged into third_party/patches/freebsd/. Update the FreeBSD build helper and CMake dependency tracking to use its new location; it still patches a fresh build-directory copy and preserves imported source digests. Both directories use the shared patch-byte preservation attributes.

The patch helper checks the complete reverse patch to recognize an already-patched checkout. Otherwise it validates the forward patch before applying it, rejecting conflicts and partial applications. Patch changes trigger CMake reconfiguration. Preserve the supplied patch bytes and document that patching changes the DPDK submodule working tree; external BYCORF_DPDK_PREFIX installations must include the patch themselves.

Validation:

• Verified the bundled patch is byte-for-byte identical to the supplied patch.
• Applied the patch to pristine source fixtures, verified a repeated invocation makes no changes, and confirmed conflicting and partially patched fixtures fail without additional changes.
• Built and installed DPDK with bus/vmbus,net/netvsc enabled through the production cmake/Dpdk.cmake module in an isolated CMake harness, including compilation of the patched hn_rxtx.c.
• Verified a patch timestamp change makes cmake --build rerun configuration and recognize the already-applied patch.
• Verified the relocated FreeBSD patch is unchanged, applies repeatedly to the generated copy without modifying imported source, and is resolved by the CMake dependency graph and build command.
• git diff --cached --check passed.

Validation covers build integration and patch handling; no netvsc hardware allocation-failure test was run.

[coderabbitai]

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