net_sched: remove list_head from tc_action

After commit 90b73b77d0, list_head is no longer needed.
Now we just need to convert the list iteration to array
iteration for drivers.

Fixes: 90b73b77d0 ("net: sched: change action API to use array of pointers to actions")
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

@@ -110,16 +110,14 @@ static int bnxt_tc_parse_actions(struct bnxt *bp,
 				 struct tcf_exts *tc_exts)
 {
 	const struct tc_action *tc_act;
-	LIST_HEAD(tc_actions);
-	int rc;
+	int i, rc;
 
 	if (!tcf_exts_has_actions(tc_exts)) {
 		netdev_info(bp->dev, "no actions");
 		return -EINVAL;
 	}
 
-	tcf_exts_to_list(tc_exts, &tc_actions);
-	list_for_each_entry(tc_act, &tc_actions, list) {
+	tcf_exts_for_each_action(i, tc_act, tc_exts) {
 		/* Drop action */
 		if (is_tcf_gact_shot(tc_act)) {
 			actions->flags |= BNXT_TC_ACTION_FLAG_DROP;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c

@@ -417,10 +417,9 @@ static void cxgb4_process_flow_actions(struct net_device *in,
 				       struct ch_filter_specification *fs)
 {
 	const struct tc_action *a;
-	LIST_HEAD(actions);
+	int i;
 
-	tcf_exts_to_list(cls->exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, cls->exts) {
 		if (is_tcf_gact_ok(a)) {
 			fs->action = FILTER_PASS;
 		} else if (is_tcf_gact_shot(a)) {
@@ -591,10 +590,9 @@ static int cxgb4_validate_flow_actions(struct net_device *dev,
 	bool act_redir = false;
 	bool act_pedit = false;
 	bool act_vlan = false;
-	LIST_HEAD(actions);
+	int i;
 
-	tcf_exts_to_list(cls->exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, cls->exts) {
 		if (is_tcf_gact_ok(a)) {
 			/* Do nothing */
 		} else if (is_tcf_gact_shot(a)) {

drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c

@@ -93,14 +93,13 @@ static int fill_action_fields(struct adapter *adap,
 	unsigned int num_actions = 0;
 	const struct tc_action *a;
 	struct tcf_exts *exts;
-	LIST_HEAD(actions);
+	int i;
 
 	exts = cls->knode.exts;
 	if (!tcf_exts_has_actions(exts))
 		return -EINVAL;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
 		/* Don't allow more than one action per rule. */
 		if (num_actions)
 			return -EINVAL;

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -9171,14 +9171,12 @@ static int parse_tc_actions(struct ixgbe_adapter *adapter,
 			    struct tcf_exts *exts, u64 *action, u8 *queue)
 {
 	const struct tc_action *a;
-	LIST_HEAD(actions);
+	int i;
 
 	if (!tcf_exts_has_actions(exts))
 		return -EINVAL;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
-
+	tcf_exts_for_each_action(i, a, exts) {
 		/* Drop action */
 		if (is_tcf_gact_shot(a)) {
 			*action = IXGBE_FDIR_DROP_QUEUE;

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -1982,14 +1982,15 @@ static bool modify_header_match_supported(struct mlx5_flow_spec *spec,
 		goto out_ok;
 
 	modify_ip_header = false;
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
+		int k;
+
 		if (!is_tcf_pedit(a))
 			continue;
 
 		nkeys = tcf_pedit_nkeys(a);
-		for (i = 0; i < nkeys; i++) {
-			htype = tcf_pedit_htype(a, i);
+		for (k = 0; k < nkeys; k++) {
+			htype = tcf_pedit_htype(a, k);
 			if (htype == TCA_PEDIT_KEY_EX_HDR_TYPE_IP4 ||
 			    htype == TCA_PEDIT_KEY_EX_HDR_TYPE_IP6) {
 				modify_ip_header = true;
@@ -2053,15 +2054,14 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
 	const struct tc_action *a;
 	LIST_HEAD(actions);
 	u32 action = 0;
-	int err;
+	int err, i;
 
 	if (!tcf_exts_has_actions(exts))
 		return -EINVAL;
 
 	attr->flow_tag = MLX5_FS_DEFAULT_FLOW_TAG;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
 		if (is_tcf_gact_shot(a)) {
 			action |= MLX5_FLOW_CONTEXT_ACTION_DROP;
 			if (MLX5_CAP_FLOWTABLE(priv->mdev,
@@ -2666,7 +2666,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
 	LIST_HEAD(actions);
 	bool encap = false;
 	u32 action = 0;
-	int err;
+	int err, i;
 
 	if (!tcf_exts_has_actions(exts))
 		return -EINVAL;
@@ -2674,8 +2674,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
 	attr->in_rep = rpriv->rep;
 	attr->in_mdev = priv->mdev;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
 		if (is_tcf_gact_shot(a)) {
 			action |= MLX5_FLOW_CONTEXT_ACTION_DROP |
 				  MLX5_FLOW_CONTEXT_ACTION_COUNT;

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -1346,8 +1346,7 @@ static int mlxsw_sp_port_add_cls_matchall(struct mlxsw_sp_port *mlxsw_sp_port,
 		return -ENOMEM;
 	mall_tc_entry->cookie = f->cookie;
 
-	tcf_exts_to_list(f->exts, &actions);
-	a = list_first_entry(&actions, struct tc_action, list);
+	a = tcf_exts_first_action(f->exts);
 
 	if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
 		struct mlxsw_sp_port_mall_mirror_tc_entry *mirror;

drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c

@@ -21,8 +21,7 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 					 struct netlink_ext_ack *extack)
 {
 	const struct tc_action *a;
-	LIST_HEAD(actions);
-	int err;
+	int err, i;
 
 	if (!tcf_exts_has_actions(exts))
 		return 0;
@@ -32,8 +31,7 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		return err;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
 		if (is_tcf_gact_ok(a)) {
 			err = mlxsw_sp_acl_rulei_act_terminate(rulei);
 			if (err) {

drivers/net/ethernet/netronome/nfp/flower/action.c

@@ -796,11 +796,10 @@ int nfp_flower_compile_action(struct nfp_app *app,
 			      struct net_device *netdev,
 			      struct nfp_fl_payload *nfp_flow)
 {
-	int act_len, act_cnt, err, tun_out_cnt, out_cnt;
+	int act_len, act_cnt, err, tun_out_cnt, out_cnt, i;
 	enum nfp_flower_tun_type tun_type;
 	const struct tc_action *a;
 	u32 csum_updated = 0;
-	LIST_HEAD(actions);
 
 	memset(nfp_flow->action_data, 0, NFP_FL_MAX_A_SIZ);
 	nfp_flow->meta.act_len = 0;
@@ -810,8 +809,7 @@ int nfp_flower_compile_action(struct nfp_app *app,
 	tun_out_cnt = 0;
 	out_cnt = 0;
 
-	tcf_exts_to_list(flow->exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, flow->exts) {
 		err = nfp_flower_loop_action(app, a, flow, nfp_flow, &act_len,
 					     netdev, &tun_type, &tun_out_cnt,
 					     &out_cnt, &csum_updated);

drivers/net/ethernet/qlogic/qede/qede_filter.c

@@ -2006,18 +2006,16 @@ int qede_get_arfs_filter_count(struct qede_dev *edev)
 static int qede_parse_actions(struct qede_dev *edev,
 			      struct tcf_exts *exts)
 {
-	int rc = -EINVAL, num_act = 0;
+	int rc = -EINVAL, num_act = 0, i;
 	const struct tc_action *a;
 	bool is_drop = false;
-	LIST_HEAD(actions);
 
 	if (!tcf_exts_has_actions(exts)) {
 		DP_NOTICE(edev, "No tc actions received\n");
 		return rc;
 	}
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(a, &actions, list) {
+	tcf_exts_for_each_action(i, a, exts) {
 		num_act++;
 
 		if (is_tcf_gact_shot(a))

drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c

@@ -61,7 +61,7 @@ static int tc_fill_actions(struct stmmac_tc_entry *entry,
 	struct stmmac_tc_entry *action_entry = entry;
 	const struct tc_action *act;
 	struct tcf_exts *exts;
-	LIST_HEAD(actions);
+	int i;
 
 	exts = cls->knode.exts;
 	if (!tcf_exts_has_actions(exts))
@@ -69,8 +69,7 @@ static int tc_fill_actions(struct stmmac_tc_entry *entry,
 	if (frag)
 		action_entry = frag;
 
-	tcf_exts_to_list(exts, &actions);
-	list_for_each_entry(act, &actions, list) {
+	tcf_exts_for_each_action(i, act, exts) {
 		/* Accept */
 		if (is_tcf_gact_ok(act)) {
 			action_entry->val.af = 1;

include/net/act_api.h

@@ -23,7 +23,6 @@ struct tc_action {
 	const struct tc_action_ops	*ops;
 	__u32				type; /* for backward compat(TCA_OLD_COMPAT) */
 	__u32				order;
-	struct list_head		list;
 	struct tcf_idrinfo		*idrinfo;
 
 	u32				tcfa_index;

include/net/pkt_cls.h

@@ -298,19 +298,13 @@ static inline void tcf_exts_put_net(struct tcf_exts *exts)
 #endif
 }
 
-static inline void tcf_exts_to_list(const struct tcf_exts *exts,
-				    struct list_head *actions)
-{
 #ifdef CONFIG_NET_CLS_ACT
-	int i;
-
-	for (i = 0; i < exts->nr_actions; i++) {
-		struct tc_action *a = exts->actions[i];
-
-		list_add_tail(&a->list, actions);
-	}
+#define tcf_exts_for_each_action(i, a, exts) \
+	for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = (exts)->actions[i]); i++)
+#else
+#define tcf_exts_for_each_action(i, a, exts) \
+	for (; 0; )
 #endif
-}
 
 static inline void
 tcf_exts_stats_update(const struct tcf_exts *exts,
@@ -361,6 +355,15 @@ static inline bool tcf_exts_has_one_action(struct tcf_exts *exts)
 #endif
 }
 
+static inline struct tc_action *tcf_exts_first_action(struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	return exts->actions[0];
+#else
+	return NULL;
+#endif
+}
+
 /**
  * tcf_exts_exec - execute tc filter extensions
  * @skb: socket buffer

net/dsa/slave.c

@@ -767,7 +767,6 @@ static int dsa_slave_add_cls_matchall(struct net_device *dev,
 	const struct tc_action *a;
 	struct dsa_port *to_dp;
 	int err = -EOPNOTSUPP;
-	LIST_HEAD(actions);
 
 	if (!ds->ops->port_mirror_add)
 		return err;
@@ -775,8 +774,7 @@ static int dsa_slave_add_cls_matchall(struct net_device *dev,
 	if (!tcf_exts_has_one_action(cls->exts))
 		return err;
 
-	tcf_exts_to_list(cls->exts, &actions);
-	a = list_first_entry(&actions, struct tc_action, list);
+	a = tcf_exts_first_action(cls->exts);
 
 	if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
 		struct dsa_mall_mirror_tc_entry *mirror;

net/sched/act_api.c

@@ -391,7 +391,6 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 
 	p->idrinfo = idrinfo;
 	p->ops = ops;
-	INIT_LIST_HEAD(&p->list);
 	*a = p;
 	return 0;
 err3: