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Date: Tue, 6 Dec 2022 14:12:15 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Pedro Tammela <pctammela@...atatu.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
pabeni@...hat.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
jiri@...nulli.us, kuniyu@...zon.com,
Victor Nogueira <victor@...atatu.com>
Subject: Re: [PATCH net-next v5 2/4] net/sched: add retpoline wrapper for tc
On Tue, Dec 6, 2022 at 1:58 PM Pedro Tammela <pctammela@...atatu.com> wrote:
>
> 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@...atatu.com>
> Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
> Reviewed-by: Victor Nogueira <victor@...atatu.com>
> ---
> include/net/tc_wrapper.h | 250 +++++++++++++++++++++++++++++++++++++++
> net/sched/act_api.c | 2 +
> net/sched/cls_api.c | 2 +
> 3 files changed, 254 insertions(+)
> create mode 100644 include/net/tc_wrapper.h
>
> diff --git a/include/net/tc_wrapper.h b/include/net/tc_wrapper.h
> new file mode 100644
> index 000000000000..429ebd7255b4
> --- /dev/null
> +++ b/include/net/tc_wrapper.h
> @@ -0,0 +1,250 @@
> +/* 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 <asm/cpufeature.h>
> +
> +#include <linux/static_key.h>
> +#include <linux/indirect_call_wrapper.h>
> +
> +#define TC_INDIRECT_SCOPE
> +
> +static DEFINE_STATIC_KEY_FALSE(tc_skip_wrapper);
I guess this should not be static.
A single key should be shared by all users.
In the include file, you probably should have:
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(rsvp_classify);
> +TC_INDIRECT_FILTER_DECLARE(rsvp6_classify);
> +TC_INDIRECT_FILTER_DECLARE(tcindex_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
> +#if IS_BUILTIN(CONFIG_NET_CLS_RSVP)
> + if (tp->classify == rsvp_classify)
> + return rsvp_classify(skb, tp, res);
> +#endif
> +#if IS_BUILTIN(CONFIG_NET_CLS_RSVP6)
> + if (tp->classify == rsvp6_classify)
> + return rsvp6_classify(skb, tp, res);
> +#endif
> +#if IS_BUILTIN(CONFIG_NET_CLS_TCINDEX)
> + if (tp->classify == tcindex_classify)
> + return tcindex_classify(skb, tp, res);
> +#endif
> +
> +skip:
> + return tp->classify(skb, tp, res);
> +}
> +
> +static inline void tc_wrapper_init(void)
> +{
> + if (!cpu_feature_enabled(X86_FEATURE_RETPOLINE))
> + static_branch_enable(&tc_skip_wrapper);
This is CONFIG_X86 specific.
> +}
> +
> +#endif /* CONFIG_NET_CLS */
> +
> +#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 */
> diff --git a/net/sched/act_api.c b/net/sched/act_api.c
> index 9b31a10cc639..9f4c0f5f45c1 100644
> --- a/net/sched/act_api.c
> +++ b/net/sched/act_api.c
> @@ -2178,6 +2178,8 @@ static int __init tc_action_init(void)
> rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
> 0);
>
> + tc_wrapper_init();
> +
> return 0;
> }
>
> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
> index 23d1cfa4f58c..a2c276116244 100644
> --- a/net/sched/cls_api.c
> +++ b/net/sched/cls_api.c
> @@ -3764,6 +3764,8 @@ static int __init tc_filter_init(void)
> rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
> tc_dump_chain, 0);
>
> + tc_wrapper_init();
> +
> return 0;
>
> err_register_pernet_subsys:
> --
> 2.34.1
>
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