router: add experimental HTTP/1.1 kTLS body-splice fast path#45581
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Relay a Content-Length HTTP/1.1 body between a kernel-TLS upstream and a
plaintext or kernel-TLS peer with an in-kernel splice(), bypassing the
userspace buffers and codec filter chains in both directions (download and
upload). Dark by default behind the runtime flag
envoy.reloadable_features.http1_ktls_body_splice and observable via the
cluster.<name>.http1_ktls_splice.{engaged,abandoned,completed,truncated}
counters.
Signed-off-by: Rohit Agrawal <rohit.agrawal@databricks.com>
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Description
This PR adds an experimental, disabled-by-default HTTP/1.1 kTLS body-splice fast path. When eligible, Envoy can relay a
Content-Lengthrequest or response body with in-kernelsplice(), bypassing user-space body buffers and codec filter-chain body processing while preserving HTTP/1.1 keep-alive reuse.The fast path is guarded by
envoy.reloadable_features.http1_ktls_body_spliceand only engages for single HTTP/1.1 socket legs with trusted upstream kTLS and a plaintext or installed-kTLS peer. Per-cluster lifecycle counters trackengaged,abandoned,completed, andtruncatedsplice decisions.Commit Message: router: add experimental HTTP/1.1 kTLS body-splice fast path
Additional Description: Added an experimental, disabled-by-default HTTP/1.1 kTLS body-splice fast path.
Risk Level: Low
Testing: Added Unit + Integration Tests
Docs Changes: Added
Release Notes: Added