From 8f0ec8c681755f523cf842bfe350ea40609b83a9 Mon Sep 17 00:00:00 2001 From: Daniel Xu Date: Thu, 14 Dec 2023 15:49:02 -0700 Subject: bpf: xfrm: Add bpf_xdp_get_xfrm_state() kfunc This commit adds an unstable kfunc helper to access internal xfrm_state associated with an SA. This is intended to be used for the upcoming IPsec pcpu work to assign special pcpu SAs to a particular CPU. In other words: for custom software RSS. That being said, the function that this kfunc wraps is fairly generic and used for a lot of xfrm tasks. I'm sure people will find uses elsewhere over time. This commit also adds a corresponding bpf_xdp_xfrm_state_release() kfunc to release the refcnt acquired by bpf_xdp_get_xfrm_state(). The verifier will require that all acquired xfrm_state's are released. Co-developed-by: Antony Antony Signed-off-by: Antony Antony Acked-by: Steffen Klassert Signed-off-by: Daniel Xu Link: https://lore.kernel.org/r/a29699c42f5fad456b875c98dd11c6afc3ffb707.1702593901.git.dxu@dxuuu.xyz Signed-off-by: Alexei Starovoitov --- include/net/xfrm.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include') diff --git a/include/net/xfrm.h b/include/net/xfrm.h index c9bb0f892f55..1d107241b901 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -2190,4 +2190,13 @@ static inline int register_xfrm_interface_bpf(void) #endif +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) +int register_xfrm_state_bpf(void); +#else +static inline int register_xfrm_state_bpf(void) +{ + return 0; +} +#endif + #endif /* _NET_XFRM_H */ -- cgit v1.2.3