flow_offload: add flow action infrastructure

This new infrastructure defines the nic actions that you can perform
from existing network drivers. This infrastructure allows us to avoid a
direct dependency with the native software TC action representation.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_api.c

@@ -31,6 +31,7 @@
 #include <net/netlink.h>
 #include <net/pkt_sched.h>
 #include <net/pkt_cls.h>
+#include <net/tc_act/tc_pedit.h>
 
 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
 
@@ -2515,6 +2516,22 @@ int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
 }
 EXPORT_SYMBOL(tc_setup_cb_call);
 
+unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
+{
+	unsigned int num_acts = 0;
+	struct tc_action *act;
+	int i;
+
+	tcf_exts_for_each_action(i, act, exts) {
+		if (is_tcf_pedit(act))
+			num_acts += tcf_pedit_nkeys(act);
+		else
+			num_acts++;
+	}
+	return num_acts;
+}
+EXPORT_SYMBOL(tcf_exts_num_actions);
+
 static __net_init int tcf_net_init(struct net *net)
 {
 	struct tcf_net *tn = net_generic(net, tcf_net_id);

net/sched/cls_flower.c

@@ -381,7 +381,7 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	bool skip_sw = tc_skip_sw(f->flags);
 	int err;
 
-	cls_flower.rule = flow_rule_alloc();
+	cls_flower.rule = flow_rule_alloc(tcf_exts_num_actions(&f->exts));
 	if (!cls_flower.rule)
 		return -ENOMEM;
 
@@ -1469,7 +1469,8 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
 			if (tc_skip_hw(f->flags))
 				continue;
 
-			cls_flower.rule = flow_rule_alloc();
+			cls_flower.rule =
+				flow_rule_alloc(tcf_exts_num_actions(&f->exts));
 			if (!cls_flower.rule)
 				return -ENOMEM;
 
@@ -1508,7 +1509,7 @@ static int fl_hw_create_tmplt(struct tcf_chain *chain,
 	struct tcf_block *block = chain->block;
 	struct tcf_exts dummy_exts = { 0, };
 
-	cls_flower.rule = flow_rule_alloc();
+	cls_flower.rule = flow_rule_alloc(0);
 	if (!cls_flower.rule)
 		return -ENOMEM;