netdev - [PATCH 2/5] net sched actions: add new tc_action

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Date:   Thu,  1 Mar 2018 13:45:28 -0500
From:   Roman Mashak <mrv@...atatu.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, jiri@...nulli.us,
        xiyou.wangcong@...il.com, Roman Mashak <mrv@...atatu.com>
Subject: [PATCH 2/5] net sched actions: add new tc_action_ops callback

Add a new callback in tc_action_ops, it will be needed by the tc actions
to compute its size when a ADD/DELETE notification message is constructed.
This routine has to take into account optional/variable size TLVs specific
per action.

Signed-off-by: Roman Mashak <mrv@...atatu.com>
---
 include/net/act_api.h | 1 +
 net/sched/act_api.c   | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/net/act_api.h b/include/net/act_api.h
index 9c2f226..0a56465 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -97,6 +97,7 @@ struct tc_action_ops {
 			const struct tc_action_ops *,
 			struct netlink_ext_ack *);
 	void	(*stats_update)(struct tc_action *, u64, u32, u64);
+	size_t  (*get_fill_size)(const struct tc_action *act);
 	struct net_device *(*get_dev)(const struct tc_action *a);
 };
 
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index acac92a..6f3307f 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -136,6 +136,14 @@ static size_t tcf_action_full_attrs_size(size_t sz)
 		+ sz;
 }
 
+static size_t tcf_action_fill_size(const struct tc_action *act)
+{
+	if (act->ops->get_fill_size)
+		return act->ops->get_fill_size(act) +
+			tcf_action_shared_attrs_size(act);
+	return 0;
+}
+
 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 			   struct netlink_callback *cb)
 {
-- 
2.7.4