[PATCH 4/4] app/testpmd: report reason when queue setup command fails

[Stephen Hemminger <stephen@networkplumber.org>]

The interactive "port <id> rxq|txq <id> setup" command printed a
bare failure message. rte_eth_rx/tx_queue_setup() can fail with
-EBUSY without logging anything, for example when the port is
started and the PMD does not support runtime queue setup, leaving
the user with no clue:

  testpmd> port 0 rxq 0 setup
  Failed to setup RX queue

Print the error string:

  Failed to setup RX queue: Device or resource busy

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test-pmd/cmdline.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index bb62778a26..e0dcdc1193 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -3092,7 +3092,8 @@ cmd_setup_rxtx_queue_parsed(
 				     &port->rxq[res->qid].conf,
 				     mp);
 		if (ret)
-			fprintf(stderr, "Failed to setup RX queue\n");
+			fprintf(stderr, "Failed to setup RX queue: %s\n",
+				rte_strerror(-ret));
 	} else {
 		socket_id = txring_numa[res->portid];
 		if (!numa_support || socket_id == NUMA_NO_CONFIG)
@@ -3109,7 +3110,8 @@ cmd_setup_rxtx_queue_parsed(
 					     socket_id,
 					     &port->txq[res->qid].conf);
 		if (ret)
-			fprintf(stderr, "Failed to setup TX queue\n");
+			fprintf(stderr, "Failed to setup TX queue: %s\n",
+				rte_strerror(-ret));
 	}
 }
 
-- 
2.53.0