net/sched: introduce ACT_P_BOUND return code

Bound actions always return '0' and as of today we rely on '0'
being returned in order to properly skip bound actions in
tcf_idr_insert_many. In order to further improve maintainability,
introduce the ACT_P_BOUND return code.

Actions are updated to return 'ACT_P_BOUND' instead of plain '0'.
tcf_idr_insert_many is then updated to check for 'ACT_P_BOUND'.
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20231229132642.1489088-1-pctammela@mojatatu.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/act_api.h

@@ -137,6 +137,7 @@ struct tc_action_ops {
 
 #ifdef CONFIG_NET_CLS_ACT
 
+#define ACT_P_BOUND 0
 #define ACT_P_CREATED 1
 #define ACT_P_DELETED 1
 

net/sched/act_api.c

@@ -1313,7 +1313,7 @@ void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
 	tcf_act_for_each_action(i, a, actions) {
 		struct tcf_idrinfo *idrinfo;
 
-		if (init_res[i] == 0) /* Bound */
+		if (init_res[i] == ACT_P_BOUND)
 			continue;
 
 		idrinfo = a->idrinfo;

net/sched/act_bpf.c

@@ -318,7 +318,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
 	} else if (ret > 0) {
 		/* Don't override defaults. */
 		if (bind)
-			return 0;
+			return ACT_P_BOUND;
 
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*act, bind);

net/sched/act_connmark.c

@@ -146,7 +146,7 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 	} else if (ret > 0) {
 		ci = to_connmark(*a);
 		if (bind) {
-			err = 0;
+			err = ACT_P_BOUND;
 			goto out_free;
 		}
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {

net/sched/act_csum.c

@@ -77,8 +77,8 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
 		}
 		ret = ACT_P_CREATED;
 	} else if (err > 0) {
-		if (bind)/* dont override defaults */
-			return 0;
+		if (bind) /* dont override defaults */
+			return ACT_P_BOUND;
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*a, bind);
 			return -EEXIST;

net/sched/act_ct.c

@@ -1349,7 +1349,7 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
 		res = ACT_P_CREATED;
 	} else {
 		if (bind)
-			return 0;
+			return ACT_P_BOUND;
 
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*a, bind);

net/sched/act_ctinfo.c

@@ -221,7 +221,7 @@ static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
 		ret = ACT_P_CREATED;
 	} else if (err > 0) {
 		if (bind) /* don't override defaults */
-			return 0;
+			return ACT_P_BOUND;
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*a, bind);
 			return -EEXIST;

net/sched/act_gact.c

@@ -108,7 +108,7 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
 		ret = ACT_P_CREATED;
 	} else if (err > 0) {
 		if (bind)/* dont override defaults */
-			return 0;
+			return ACT_P_BOUND;
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*a, bind);
 			return -EEXIST;

net/sched/act_gate.c

@@ -356,7 +356,7 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
 		return err;
 
 	if (err && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!err) {
 		ret = tcf_idr_create_from_flags(tn, index, est, a,

net/sched/act_ife.c

@@ -548,7 +548,7 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 	exists = err;
 	if (exists && bind) {
 		kfree(p);
-		return 0;
+		return ACT_P_BOUND;
 	}
 
 	if (!exists) {

net/sched/act_mirred.c

@@ -135,7 +135,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (tb[TCA_MIRRED_BLOCKID] && parm->ifindex) {
 		NL_SET_ERR_MSG_MOD(extack,

net/sched/act_mpls.c

@@ -195,7 +195,7 @@ static int tcf_mpls_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!exists) {
 		ret = tcf_idr_create(tn, index, est, a, &act_mpls_ops, bind,

net/sched/act_nat.c

@@ -69,7 +69,7 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 		ret = ACT_P_CREATED;
 	} else if (err > 0) {
 		if (bind)
-			return 0;
+			return ACT_P_BOUND;
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			tcf_idr_release(*a, bind);
 			return -EEXIST;

net/sched/act_pedit.c

@@ -202,7 +202,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 		ret = ACT_P_CREATED;
 	} else if (err > 0) {
 		if (bind)
-			return 0;
+			return ACT_P_BOUND;
 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 			ret = -EEXIST;
 			goto out_release;

net/sched/act_police.c

@@ -77,7 +77,7 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!exists) {
 		ret = tcf_idr_create(tn, index, NULL, a,

net/sched/act_sample.c

@@ -66,7 +66,7 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!exists) {
 		ret = tcf_idr_create(tn, index, est, a,

net/sched/act_simple.c

@@ -118,7 +118,7 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (tb[TCA_DEF_DATA] == NULL) {
 		if (exists)

net/sched/act_skbedit.c

@@ -209,7 +209,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!flags) {
 		if (exists)

net/sched/act_skbmod.c

@@ -157,7 +157,7 @@ static int tcf_skbmod_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	if (!lflags) {
 		if (exists)

net/sched/act_tunnel_key.c

@@ -401,7 +401,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	switch (parm->t_action) {
 	case TCA_TUNNEL_KEY_ACT_RELEASE:

net/sched/act_vlan.c

@@ -151,7 +151,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
 		return err;
 	exists = err;
 	if (exists && bind)
-		return 0;
+		return ACT_P_BOUND;
 
 	switch (parm->v_action) {
 	case TCA_VLAN_ACT_POP: