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tcp_bpf: improve ingress redirection performance with message corking #8541

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tcp_bpf: improve ingress redirection performance with message corking #8541

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Pull request for series with
subject: tcp_bpf: improve ingress redirection performance with message corking
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737

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Upstream branch: 63817c7
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 201b62c
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 2398608
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 11ba7ce
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 236d391
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 1ffe30e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 4e4136c
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: 9138048
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: b123480
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=936737
version: 1

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Upstream branch: ae0a457
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

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Upstream branch: f4edc66
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

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Upstream branch: 6ca2162
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

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Upstream branch: a259804
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

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Upstream branch: 79db658
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

Cong Wang and others added 2 commits March 20, 2025 10:39
skmsg: rename sk_msg_alloc() to sk_msg_expand()
f953490 
The name sk_msg_alloc is misleading, that function does not allocate
sk_msg at all, it simply refills sock page frags. Rename it to
sk_msg_expand() to better reflect what it actually does.

Signed-off-by: Cong Wang <[email protected]>
skmsg: implement slab allocator cache for sk_msg
a8c3bd6 
Optimizing redirect ingress performance requires frequent allocation and
deallocation of sk_msg structures. Introduce a dedicated kmem_cache for
sk_msg to reduce memory allocation overhead and improve performance.

Reviewed-by: Cong Wang <[email protected]>
Signed-off-by: Zijian Zhang <[email protected]>
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Upstream branch: e16e64f
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=941243
version: 2

Cong Wang and others added 2 commits March 20, 2025 10:39
skmsg: save some space in struct sk_psock
f614383 
This patch aims to save some space in struct sk_psock and prepares for
the next patch which will add more fields.

psock->eval can only have 4 possible values, make it 8-bit is
sufficient.

psock->redir_ingress is just a boolean, using 1 bit is enough.

Signed-off-by: Cong Wang <[email protected]>
tcp_bpf: improve ingress redirection performance with message corking
5ea0f29 
The TCP_BPF ingress redirection path currently lacks the message corking
mechanism found in standard TCP. This causes the sender to wake up the
receiver for every message, even when messages are small, resulting in
reduced throughput compared to regular TCP in certain scenarios.

This change introduces a kernel worker-based intermediate layer to provide
automatic message corking for TCP_BPF. While this adds a slight latency
overhead, it significantly improves overall throughput by reducing
unnecessary wake-ups and reducing the sock lock contention.

Reviewed-by: Amery Hung <[email protected]>
Co-developed-by: Cong Wang <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: Zijian Zhang <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=936737 irrelevant now. Closing PR.

@kernel-patches-daemon-bpf kernel-patches-daemon-bpf bot deleted the series/936737=>bpf-next branch March 20, 2025 22:56
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