From 80cd22c35c9001fe72bf614d29439de41933deca Mon Sep 17 00:00:00 2001 From: Paul Blakey Date: Sat, 18 Feb 2023 00:36:14 +0200 Subject: net/sched: cls_api: Support hardware miss to tc action For drivers to support partial offload of a filter's action list, add support for action miss to specify an action instance to continue from in sw. CT action in particular can't be fully offloaded, as new connections need to be handled in software. This imposes other limitations on the actions that can be offloaded together with the CT action, such as packet modifications. Assign each action on a filter's action list a unique miss_cookie which drivers can then use to fill action_miss part of the tc skb extension. On getting back this miss_cookie, find the action instance with relevant cookie and continue classifying from there. Signed-off-by: Paul Blakey Reviewed-by: Jiri Pirko Reviewed-by: Simon Horman Reviewed-by: Marcelo Ricardo Leitner Acked-by: Jamal Hadi Salim Signed-off-by: Jakub Kicinski --- include/net/flow_offload.h | 1 + include/net/pkt_cls.h | 34 ++++++++++++++++++++-------------- include/net/sch_generic.h | 2 ++ 3 files changed, 23 insertions(+), 14 deletions(-) (limited to 'include/net') diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h index 9c5cb12f8a90..118082eae48c 100644 --- a/include/net/flow_offload.h +++ b/include/net/flow_offload.h @@ -229,6 +229,7 @@ struct flow_action_entry { enum flow_action_id id; u32 hw_index; unsigned long cookie; + u64 miss_cookie; enum flow_action_hw_stats hw_stats; action_destr destructor; void *destructor_priv; diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h index ace437c6754b..b3b5b0b62f16 100644 --- a/include/net/pkt_cls.h +++ b/include/net/pkt_cls.h @@ -59,6 +59,8 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, void tcf_block_put(struct tcf_block *block); void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei); +int tcf_exts_init_ex(struct tcf_exts *exts, struct net *net, int action, + int police, struct tcf_proto *tp, u32 handle, bool used_action_miss); static inline bool tcf_block_shared(struct tcf_block *block) { @@ -229,6 +231,7 @@ struct tcf_exts { struct tc_action **actions; struct net *net; netns_tracker ns_tracker; + struct tcf_exts_miss_cookie_node *miss_cookie_node; #endif /* Map to export classifier specific extension TLV types to the * generic extensions API. Unsupported extensions must be set to 0. @@ -240,21 +243,11 @@ struct tcf_exts { static inline int tcf_exts_init(struct tcf_exts *exts, struct net *net, int action, int police) { -#ifdef CONFIG_NET_CLS_ACT - exts->type = 0; - exts->nr_actions = 0; - /* Note: we do not own yet a reference on net. - * This reference might be taken later from tcf_exts_get_net(). - */ - exts->net = net; - exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *), - GFP_KERNEL); - if (!exts->actions) - return -ENOMEM; +#ifdef CONFIG_NET_CLS + return tcf_exts_init_ex(exts, net, action, police, NULL, 0, false); +#else + return -EOPNOTSUPP; #endif - exts->action = action; - exts->police = police; - return 0; } /* Return false if the netns is being destroyed in cleanup_net(). Callers @@ -360,6 +353,18 @@ tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, return TC_ACT_OK; } +static inline int +tcf_exts_exec_ex(struct sk_buff *skb, struct tcf_exts *exts, int act_index, + struct tcf_result *res) +{ +#ifdef CONFIG_NET_CLS_ACT + return tcf_action_exec(skb, exts->actions + act_index, + exts->nr_actions - act_index, res); +#else + return TC_ACT_OK; +#endif +} + int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, struct nlattr *rate_tlv, struct tcf_exts *exts, u32 flags, @@ -584,6 +589,7 @@ int tc_setup_offload_action(struct flow_action *flow_action, void tc_cleanup_offload_action(struct flow_action *flow_action); int tc_setup_action(struct flow_action *flow_action, struct tc_action *actions[], + u32 miss_cookie_base, struct netlink_ext_ack *extack); int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index af4aa66aaa4e..fab5ba3e61b7 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -369,6 +369,8 @@ struct tcf_proto_ops { struct nlattr **tca, struct netlink_ext_ack *extack); void (*tmplt_destroy)(void *tmplt_priv); + struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, + u32 handle); /* rtnetlink specific */ int (*dump)(struct net*, struct tcf_proto*, void *, -- cgit v1.2.3