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linux/include/net/tc_wrapper.h

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net/sched: add retpoline wrapper for tc On kernels using retpoline as a spectrev2 mitigation, optimize actions and filters that are compiled as built-ins into a direct call. On subsequent patches we expose the classifiers and actions functions and wire up the wrapper into tc. Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-12-06 10:55:11 -03:00
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_TC_WRAPPER_H
#define __NET_TC_WRAPPER_H
#include <net/pkt_cls.h>
#if IS_ENABLED(CONFIG_RETPOLINE)
#include <linux/cpufeature.h>
#include <linux/static_key.h>
#include <linux/indirect_call_wrapper.h>
#define TC_INDIRECT_SCOPE
extern struct static_key_false tc_skip_wrapper;
/* TC Actions */
#ifdef CONFIG_NET_CLS_ACT
#define TC_INDIRECT_ACTION_DECLARE(fname) \
INDIRECT_CALLABLE_DECLARE(int fname(struct sk_buff *skb, \
const struct tc_action *a, \
struct tcf_result *res))
TC_INDIRECT_ACTION_DECLARE(tcf_bpf_act);
TC_INDIRECT_ACTION_DECLARE(tcf_connmark_act);
TC_INDIRECT_ACTION_DECLARE(tcf_csum_act);
TC_INDIRECT_ACTION_DECLARE(tcf_ct_act);
TC_INDIRECT_ACTION_DECLARE(tcf_ctinfo_act);
TC_INDIRECT_ACTION_DECLARE(tcf_gact_act);
TC_INDIRECT_ACTION_DECLARE(tcf_gate_act);
TC_INDIRECT_ACTION_DECLARE(tcf_ife_act);
TC_INDIRECT_ACTION_DECLARE(tcf_ipt_act);
TC_INDIRECT_ACTION_DECLARE(tcf_mirred_act);
TC_INDIRECT_ACTION_DECLARE(tcf_mpls_act);
TC_INDIRECT_ACTION_DECLARE(tcf_nat_act);
TC_INDIRECT_ACTION_DECLARE(tcf_pedit_act);
TC_INDIRECT_ACTION_DECLARE(tcf_police_act);
TC_INDIRECT_ACTION_DECLARE(tcf_sample_act);
TC_INDIRECT_ACTION_DECLARE(tcf_simp_act);
TC_INDIRECT_ACTION_DECLARE(tcf_skbedit_act);
TC_INDIRECT_ACTION_DECLARE(tcf_skbmod_act);
TC_INDIRECT_ACTION_DECLARE(tcf_vlan_act);
TC_INDIRECT_ACTION_DECLARE(tunnel_key_act);
static inline int tc_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
if (static_branch_likely(&tc_skip_wrapper))
goto skip;
#if IS_BUILTIN(CONFIG_NET_ACT_GACT)
if (a->ops->act == tcf_gact_act)
return tcf_gact_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_MIRRED)
if (a->ops->act == tcf_mirred_act)
return tcf_mirred_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_PEDIT)
if (a->ops->act == tcf_pedit_act)
return tcf_pedit_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_SKBEDIT)
if (a->ops->act == tcf_skbedit_act)
return tcf_skbedit_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_SKBMOD)
if (a->ops->act == tcf_skbmod_act)
return tcf_skbmod_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_POLICE)
if (a->ops->act == tcf_police_act)
return tcf_police_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_BPF)
if (a->ops->act == tcf_bpf_act)
return tcf_bpf_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_CONNMARK)
if (a->ops->act == tcf_connmark_act)
return tcf_connmark_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_CSUM)
if (a->ops->act == tcf_csum_act)
return tcf_csum_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_CT)
if (a->ops->act == tcf_ct_act)
return tcf_ct_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_CTINFO)
if (a->ops->act == tcf_ctinfo_act)
return tcf_ctinfo_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_GATE)
if (a->ops->act == tcf_gate_act)
return tcf_gate_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_MPLS)
if (a->ops->act == tcf_mpls_act)
return tcf_mpls_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_NAT)
if (a->ops->act == tcf_nat_act)
return tcf_nat_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_TUNNEL_KEY)
if (a->ops->act == tunnel_key_act)
return tunnel_key_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_VLAN)
if (a->ops->act == tcf_vlan_act)
return tcf_vlan_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_IFE)
if (a->ops->act == tcf_ife_act)
return tcf_ife_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_IPT)
if (a->ops->act == tcf_ipt_act)
return tcf_ipt_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_SIMP)
if (a->ops->act == tcf_simp_act)
return tcf_simp_act(skb, a, res);
#endif
#if IS_BUILTIN(CONFIG_NET_ACT_SAMPLE)
if (a->ops->act == tcf_sample_act)
return tcf_sample_act(skb, a, res);
#endif
skip:
return a->ops->act(skb, a, res);
}
#endif /* CONFIG_NET_CLS_ACT */
/* TC Filters */
#ifdef CONFIG_NET_CLS
#define TC_INDIRECT_FILTER_DECLARE(fname) \
INDIRECT_CALLABLE_DECLARE(int fname(struct sk_buff *skb, \
const struct tcf_proto *tp, \
struct tcf_result *res))
TC_INDIRECT_FILTER_DECLARE(basic_classify);
TC_INDIRECT_FILTER_DECLARE(cls_bpf_classify);
TC_INDIRECT_FILTER_DECLARE(cls_cgroup_classify);
TC_INDIRECT_FILTER_DECLARE(fl_classify);
TC_INDIRECT_FILTER_DECLARE(flow_classify);
TC_INDIRECT_FILTER_DECLARE(fw_classify);
TC_INDIRECT_FILTER_DECLARE(mall_classify);
TC_INDIRECT_FILTER_DECLARE(route4_classify);
TC_INDIRECT_FILTER_DECLARE(u32_classify);
static inline int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
if (static_branch_likely(&tc_skip_wrapper))
goto skip;
#if IS_BUILTIN(CONFIG_NET_CLS_BPF)
if (tp->classify == cls_bpf_classify)
return cls_bpf_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_U32)
if (tp->classify == u32_classify)
return u32_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_FLOWER)
if (tp->classify == fl_classify)
return fl_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_FW)
if (tp->classify == fw_classify)
return fw_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_MATCHALL)
if (tp->classify == mall_classify)
return mall_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_BASIC)
if (tp->classify == basic_classify)
return basic_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_CGROUP)
if (tp->classify == cls_cgroup_classify)
return cls_cgroup_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_FLOW)
if (tp->classify == flow_classify)
return flow_classify(skb, tp, res);
#endif
#if IS_BUILTIN(CONFIG_NET_CLS_ROUTE4)
if (tp->classify == route4_classify)
return route4_classify(skb, tp, res);
#endif
skip:
return tp->classify(skb, tp, res);
}
net/sched: fix retpoline wrapper compilation on configs without tc filters Rudi reports a compilation failure on x86_64 when CONFIG_NET_CLS or CONFIG_NET_CLS_ACT is not set but CONFIG_RETPOLINE is set. A misplaced '#endif' was causing the issue. Fixes: 7f0e810220e2 ("net/sched: add retpoline wrapper for tc") Tested-by: Rudi Heitbaum <rudi@heitbaum.com> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-12-27 11:04:59 -03:00
#endif /* CONFIG_NET_CLS */
net/sched: add retpoline wrapper for tc On kernels using retpoline as a spectrev2 mitigation, optimize actions and filters that are compiled as built-ins into a direct call. On subsequent patches we expose the classifiers and actions functions and wire up the wrapper into tc. Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-12-06 10:55:11 -03:00
static inline void tc_wrapper_init(void)
{
#ifdef CONFIG_X86
if (!cpu_feature_enabled(X86_FEATURE_RETPOLINE))
static_branch_enable(&tc_skip_wrapper);
#endif
}
#else
#define TC_INDIRECT_SCOPE static
static inline int tc_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
return a->ops->act(skb, a, res);
}
static inline int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
return tp->classify(skb, tp, res);
}
static inline void tc_wrapper_init(void)
{
}
#endif
#endif /* __NET_TC_WRAPPER_H */
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