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bpf: Remove extra lock_sock for TCP_ZEROCOPY_RECEIVE

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Add custom implementation of getsockopt hook for TCP_ZEROCOPY_RECEIVE.
We skip generic hooks for TCP_ZEROCOPY_RECEIVE and have a custom
call in do_tcp_getsockopt using the on-stack data. This removes
3% overhead for locking/unlocking the socket.

Without this patch:
     3.38%     0.07%  tcp_mmap  [kernel.kallsyms]  [k] __cgroup_bpf_run_filter_getsockopt
            |
             --3.30%--__cgroup_bpf_run_filter_getsockopt
                       |
                        --0.81%--__kmalloc

With the patch applied:
     0.52%     0.12%  tcp_mmap  [kernel.kallsyms]  [k] __cgroup_bpf_run_filter_getsockopt_kern

Note, exporting uapi/tcp.h requires removing netinet/tcp.h
from test_progs.h because those headers have confliciting
definitions.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210115163501.805133-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev
2021-01-15 08:34:59 -08:00
committed by Alexei Starovoitov
parent 13ca51d5eb
commit 9cacf81f81
16 changed files with 506 additions and 7 deletions
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1
tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
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@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Cloudflare
#include <error.h>
#include <netinet/tcp.h>
#include "test_progs.h"
#include "test_skmsg_load_helpers.skel.h"