net_sched: refactor TC action init API

TC action ->init() API has 10 parameters, it becomes harder
to read. Some of them are just boolean and can be replaced
by flags. Similarly for the internal API tcf_action_init()
and tcf_exts_validate().

This patch converts them to flags and fold them into
the upper 16 bits of "flags", whose lower 16 bits are still
reserved for user-space. More specifically, the following
kernel flags are introduced:

TCA_ACT_FLAGS_POLICE replace 'name' in a few contexts, to
distinguish whether it is compatible with policer.

TCA_ACT_FLAGS_BIND replaces 'bind', to indicate whether
this action is bound to a filter.

TCA_ACT_FLAGS_REPLACE  replaces 'ovr' in most contexts,
means we are replacing an existing action.

TCA_ACT_FLAGS_NO_RTNL replaces 'rtnl_held' but has the
opposite meaning, because we still hold RTNL in most
cases.

The only user-space flag TCA_ACT_FLAGS_NO_PERCPU_STATS is
untouched and still stored as before.

I have tested this patch with tdc and I do not see any
failure related to this patch.

Tested-by: Vlad Buslov <vladbu@nvidia.com>
Acked-by: Jamal Hadi Salim<jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 17 insertions, 10 deletions

diff --git a/include/net/act_api.h b/include/net/act_api.h
index 086b291e9530..f19f7f4a463c 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -58,6 +58,14 @@ struct tc_action {
 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \
 			      TCA_ACT_HW_STATS_DELAYED)
 
+/* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */
+#define TCA_ACT_FLAGS_USER_BITS 16
+#define TCA_ACT_FLAGS_USER_MASK 0xffff
+#define TCA_ACT_FLAGS_POLICE	(1U << TCA_ACT_FLAGS_USER_BITS)
+#define TCA_ACT_FLAGS_BIND	(1U << (TCA_ACT_FLAGS_USER_BITS + 1))
+#define TCA_ACT_FLAGS_REPLACE	(1U << (TCA_ACT_FLAGS_USER_BITS + 2))
+#define TCA_ACT_FLAGS_NO_RTNL	(1U << (TCA_ACT_FLAGS_USER_BITS + 3))
+
 /* Update lastuse only if needed, to avoid dirtying a cache line.
  * We use a temp variable to avoid fetching jiffies twice.
  */
@@ -99,8 +107,8 @@ struct tc_action_ops {
 	void	(*cleanup)(struct tc_action *);
 	int     (*lookup)(struct net *net, struct tc_action **a, u32 index);
 	int     (*init)(struct net *net, struct nlattr *nla,
-			struct nlattr *est, struct tc_action **act, int ovr,
-			int bind, bool rtnl_held, struct tcf_proto *tp,
+			struct nlattr *est, struct tc_action **act,
+			struct tcf_proto *tp,
 			u32 flags, struct netlink_ext_ack *extack);
 	int     (*walk)(struct net *, struct sk_buff *,
 			struct netlink_callback *, int,
@@ -179,18 +187,16 @@ int tcf_action_destroy(struct tc_action *actions[], int bind);
 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 		    int nr_actions, struct tcf_result *res);
 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
-		    struct nlattr *est, char *name, int ovr, int bind,
+		    struct nlattr *est,
 		    struct tc_action *actions[], int init_res[], size_t *attr_size,
-		    bool rtnl_held, struct netlink_ext_ack *extack);
-struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
+		    u32 flags, struct netlink_ext_ack *extack);
+struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
 					 bool rtnl_held,
 					 struct netlink_ext_ack *extack);
 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 				    struct nlattr *nla, struct nlattr *est,
-				    char *name, int ovr, int bind,
 				    struct tc_action_ops *a_o, int *init_res,
-				    bool rtnl_held,
-				    struct netlink_ext_ack *extack);
+				    u32 flags, struct netlink_ext_ack *extack);
 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
 		    int ref, bool terse);
 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index dc28fcb6f0a2..64de26b7ad39 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -319,7 +319,7 @@ tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
 
 int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
 		      struct nlattr **tb, struct nlattr *rate_tlv,
-		      struct tcf_exts *exts, bool ovr, bool rtnl_held,
+		      struct tcf_exts *exts, u32 flags,
 		      struct netlink_ext_ack *extack);
 void tcf_exts_destroy(struct tcf_exts *exts);
 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 9ed33e6840bd..c0069ac00e62 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -357,7 +357,7 @@ struct tcf_proto_ops {
 	int			(*change)(struct net *net, struct sk_buff *,
 					struct tcf_proto*, unsigned long,
 					u32 handle, struct nlattr **,
-					void **, bool, bool,
+					void **, u32,
 					struct netlink_ext_ack *);
 	int			(*delete)(struct tcf_proto *tp, void *arg,
 					  bool *last, bool rtnl_held,
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 025c40fef93d..6836ccb9c45d 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -22,6 +22,7 @@ enum {
 	__TCA_ACT_MAX
 };
 
+/* See other TCA_ACT_FLAGS_ * flags in include/net/act_api.h. */
 #define TCA_ACT_FLAGS_NO_PERCPU_STATS 1 /* Don't use percpu allocator for
 					 * actions stats.
 					 */