netdev - [PATCHv2 net-next] geneve: allow to clear ttl inherit

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Message-Id: <1538233589-13899-1-git-send-email-liuhangbin@gmail.com>
Date:   Sat, 29 Sep 2018 23:06:29 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, Phil Sutter <phil@....cc>,
        Hangbin Liu <liuhangbin@...il.com>,
        Michal Kubecek <mkubecek@...e.cz>
Subject: [PATCHv2 net-next] geneve: allow to clear ttl inherit

As Michal remaind, we should allow to clear ttl inherit. Then we will
have three states:

1. set the flag, and do ttl inherit.
2. do not set the flag, use configured ttl value, or default ttl (0) if
   not set.
3. disable ttl inherit, use previous configured ttl value, or default ttl (0).

Fixes: 52d0d404d39dd ("geneve: add ttl inherit support")
CC: Michal Kubecek <mkubecek@...e.cz>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 drivers/net/geneve.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 6625fab..82eccc9 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1325,11 +1325,15 @@ static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
 		info->key.tun_id = tunid;
 	}
 
-	if (data[IFLA_GENEVE_TTL])
+	if (data[IFLA_GENEVE_TTL_INHERIT]) {
+		if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
+			*ttl_inherit = true;
+		else
+			*ttl_inherit = false;
+	} else if (data[IFLA_GENEVE_TTL]) {
 		info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
-
-	if (data[IFLA_GENEVE_TTL_INHERIT])
-		*ttl_inherit = true;
+		*ttl_inherit = false;
+	}
 
 	if (data[IFLA_GENEVE_TOS])
 		info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
-- 
2.5.5