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The introduction of IPPROTO_SMC enables eBPF programs to determine whether to use SMC based on the context of socket creation, such as network namespaces, PID and comm name, etc. As a subsequent enhancement, to introduce a new generic hook that allows decisions on whether to use SMC or not at runtime, including but not limited to local/remote IP address or ports. User can write their own implememtion via bpf_struct_ops now to choose whether to use SMC or not before TCP 3rd handshake to be comleted. Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Reviewed-by: Dust Li <dust.li@linux.alibaba.com> Link: https://patch.msgid.link/20251107035632.115950-3-alibuda@linux.alibaba.com
32 lines
819 B
C
32 lines
819 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Generic hook for SMC handshake flow.
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*
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* Copyright IBM Corp. 2016
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* Copyright (c) 2025, Alibaba Inc.
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*
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* Author: D. Wythe <alibuda@linux.alibaba.com>
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*/
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#ifndef __SMC_HS_CTRL
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#define __SMC_HS_CTRL
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#include <net/smc.h>
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/* Find hs_ctrl by the target name, which required to be a c-string.
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* Return NULL if no such ctrl was found,otherwise, return a valid ctrl.
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*
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* Note: Caller MUST ensure it's was invoked under rcu_read_lock.
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*/
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struct smc_hs_ctrl *smc_hs_ctrl_find_by_name(const char *name);
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#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
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int bpf_smc_hs_ctrl_init(void);
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#else
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static inline int bpf_smc_hs_ctrl_init(void) { return 0; }
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#endif /* CONFIG_SMC_HS_CTRL_BPF */
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#endif /* __SMC_HS_CTRL */
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