netdev - [PATCH iproute2] tc/mqprio: Print extra info on invalid args.

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Message-Id: <20180905202419.238812-1-caleb.raitto@gmail.com>
Date:   Wed,  5 Sep 2018 13:24:19 -0700
From:   Caleb Raitto <caleb.raitto@...il.com>
To:     stephen@...workplumber.org, netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        Caleb Raitto <caraitto@...gle.com>
Subject: [PATCH iproute2] tc/mqprio: Print extra info on invalid args.

From: Caleb Raitto <caraitto@...gle.com>

Print the name of the argument that wasn't understood, and also print
the usage string.

Signed-off-by: Caleb Raitto <caraitto@...gle.com>
---
 tc/q_mqprio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tc/q_mqprio.c b/tc/q_mqprio.c
index 89b46002..cf2eceb4 100644
--- a/tc/q_mqprio.c
+++ b/tc/q_mqprio.c
@@ -167,7 +167,8 @@ static int mqprio_parse_opt(struct qdisc_util *qu, int argc,
 			explain();
 			return -1;
 		} else {
-			fprintf(stderr, "Unknown argument\n");
+			fprintf(stderr, "Unknown argument: %s\n", *argv);
+			explain();
 			return -1;
 		}
 		argc--; argv++;
-- 
2.19.0.rc1.350.ge57e33dbd1-goog