netdev - [PATCH net-next 1/4] net: sched: refine extack messages in tcf_change

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Date:   Mon, 23 Mar 2020 21:48:47 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH net-next 1/4] net: sched: refine extack messages in
 tcf_change_indev

Add an error message when device wasn't found.
While there, also set the bad attribute's offset in extack.

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 include/net/pkt_cls.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 1db8b27d4515..41902e10d503 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -502,12 +502,16 @@ tcf_change_indev(struct net *net, struct nlattr *indev_tlv,
 	struct net_device *dev;
 
 	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) {
-		NL_SET_ERR_MSG(extack, "Interface name too long");
+		NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
+				    "Interface name too long");
 		return -EINVAL;
 	}
 	dev = __dev_get_by_name(net, indev);
-	if (!dev)
+	if (!dev) {
+		NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
+				    "Network device not found");
 		return -ENODEV;
+	}
 	return dev->ifindex;
 }
 
-- 
2.21.1