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Message-ID: <cover.1700676682.git.dxu@dxuuu.xyz>
Date: Wed, 22 Nov 2023 11:20:21 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
steffen.klassert@...unet.com,
antony.antony@...unet.com,
alexei.starovoitov@...il.com
Cc: devel@...ux-ipsec.org
Subject: [PATCH ipsec-next v1 0/7] Add bpf_xdp_get_xfrm_state() kfunc
This patchset adds two kfunc helpers, bpf_xdp_get_xfrm_state() and
bpf_xdp_xfrm_state_release() that wrap xfrm_state_lookup() and
xfrm_state_put(). The intent is to support software RSS (via XDP) for
the ongoing/upcoming ipsec pcpu work [0]. Recent experiments performed
on (hopefully) reproducible AWS testbeds indicate that single tunnel
pcpu ipsec can reach line rate on 100G ENA nics.
Note this patchset only tests/shows generic xfrm_state access. The
"secret sauce" (if you can really even call it that) involves accessing
a soon-to-be-upstreamed pcpu_num field in xfrm_state. Early example is
available here [1].
[0]: https://datatracker.ietf.org/doc/draft-ietf-ipsecme-multi-sa-performance/03/
[1]: https://github.com/danobi/xdp-tools/blob/e89a1c617aba3b50d990f779357d6ce2863ecb27/xdp-bench/xdp_redirect_cpumap.bpf.c#L385-L406
Changes from RFCv2:
* Rebased to ipsec-next
* Fix netns leak
Changes from RFCv1:
* Add Antony's commit tags
* Add KF_ACQUIRE and KF_RELEASE semantics
Daniel Xu (7):
bpf: xfrm: Add bpf_xdp_get_xfrm_state() kfunc
bpf: xfrm: Add bpf_xdp_xfrm_state_release() kfunc
bpf: selftests: test_tunnel: Use ping -6 over ping6
bpf: selftests: test_tunnel: Mount bpffs if necessary
bpf: selftests: test_tunnel: Use vmlinux.h declarations
bpf: selftests: test_tunnel: Disable CO-RE relocations
bpf: xfrm: Add selftest for bpf_xdp_get_xfrm_state()
include/net/xfrm.h | 9 ++
net/xfrm/Makefile | 1 +
net/xfrm/xfrm_policy.c | 2 +
net/xfrm/xfrm_state_bpf.c | 127 ++++++++++++++++++
.../selftests/bpf/progs/bpf_tracing_net.h | 1 +
.../selftests/bpf/progs/test_tunnel_kern.c | 98 ++++++++------
tools/testing/selftests/bpf/test_tunnel.sh | 43 ++++--
7 files changed, 227 insertions(+), 54 deletions(-)
create mode 100644 net/xfrm/xfrm_state_bpf.c
--
2.42.1
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