netdev - [PATCH net-next v4 1/4] net/sched: act_tunnel_key: add support for "don't fragment"

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Date:   Wed, 29 Mar 2023 11:54:52 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ilya Maximets <i.maximets@....org>
Cc:     Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next v4 1/4] net/sched: act_tunnel_key: add support for "don't fragment"

extend "act_tunnel_key" to allow specifying TUNNEL_DONT_FRAGMENT.

Suggested-by: Ilya Maximets <i.maximets@....org>
Reviewed-by: Pedro Tammela <pctammela@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 include/uapi/linux/tc_act/tc_tunnel_key.h | 1 +
 net/sched/act_tunnel_key.c                | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/uapi/linux/tc_act/tc_tunnel_key.h b/include/uapi/linux/tc_act/tc_tunnel_key.h
index 49ad4033951b..37c6f612f161 100644
--- a/include/uapi/linux/tc_act/tc_tunnel_key.h
+++ b/include/uapi/linux/tc_act/tc_tunnel_key.h
@@ -34,6 +34,7 @@ enum {
 					 */
 	TCA_TUNNEL_KEY_ENC_TOS,		/* u8 */
 	TCA_TUNNEL_KEY_ENC_TTL,		/* u8 */
+	TCA_TUNNEL_KEY_NO_FRAG,		/* flag */
 	__TCA_TUNNEL_KEY_MAX,
 };
 
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 2d12d2626415..0c8aa7e686ea 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -420,6 +420,9 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 		    nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
 			flags &= ~TUNNEL_CSUM;
 
+		if (nla_get_flag(tb[TCA_TUNNEL_KEY_NO_FRAG]))
+			flags |= TUNNEL_DONT_FRAGMENT;
+
 		if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
 			dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
 
@@ -747,6 +750,8 @@ static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 				   key->tp_dst)) ||
 		    nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
 			       !(key->tun_flags & TUNNEL_CSUM)) ||
+		    ((key->tun_flags & TUNNEL_DONT_FRAGMENT) &&
+		     nla_put_flag(skb, TCA_TUNNEL_KEY_NO_FRAG)) ||
 		    tunnel_key_opts_dump(skb, info))
 			goto nla_put_failure;
 
-- 
2.39.2