netdev - [PATCH net-next 1/5] net sched actions: routines to calculate common TLVs size

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Date:   Fri,  2 Mar 2018 17:01:39 -0500
From:   Roman Mashak <mrv@...atatu.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kernel@...atatu.com, jhs@...atatu.com,
        jiri@...nulli.us, xiyou.wangcong@...il.com,
        Roman Mashak <mrv@...atatu.com>
Subject: [PATCH net-next 1/5] net sched actions: routines to calculate common TLVs size

Introduce routine to calculate size of the common tc netlink attributes,
and another helper routine to get the full message size including netlink
header and service header.

Signed-off-by: Roman Mashak <mrv@...atatu.com>
---
 net/sched/act_api.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 1f65d6a..acac92a 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -109,6 +109,33 @@ int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
 }
 EXPORT_SYMBOL(__tcf_idr_release);
 
+static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
+{
+	u32 cookie_len = 0;
+
+	if (act->act_cookie)
+		cookie_len = nla_total_size(act->act_cookie->len);
+
+	return	nla_total_size(0) /* action number nested */
+		+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
+		+ cookie_len /* TCA_ACT_COOKIE */
+		+ nla_total_size(0) /* TCA_ACT_STATS nested */
+		/* TCA_STATS_BASIC */
+		+ nla_total_size_64bit(sizeof(struct gnet_stats_basic))
+		/* TCA_STATS_QUEUE */
+		+ nla_total_size_64bit(sizeof(struct gnet_stats_queue))
+		+ nla_total_size(0) /* TCA_OPTIONS nested */
+		+ nla_total_size(sizeof(struct tcf_t));	/* TCA_GACT_TM */
+}
+
+static size_t tcf_action_full_attrs_size(size_t sz)
+{
+	return NLMSG_HDRLEN			/* struct nlmsghdr */
+		+ sizeof(struct tcamsg)
+		+ nla_total_size(0)		/* TCA_ACT_TAB nested */
+		+ sz;
+}
+
 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 			   struct netlink_callback *cb)
 {
-- 
2.7.4