[dpdk-dev] [PATCH] examples/vhost: fix failure without hints

[Jianfeng Tan <jianfeng.tan@intel.com>]

When the specified cores and memory lie on different numa socket with
physical NIC, vhost fails to set up rx queue, and exits without any
hints. This could leads to confusion of users.

This patch fixes it by adding some error messages when calling ether
APIs returns errors.

Fixes: 4796ad63ba1f ("examples/vhost: import userspace vhost application")

Reported-by: Yulong Pei <yulong.pei@intel.com>
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 examples/vhost/main.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 3aff2cc..3b98f42 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -332,8 +332,11 @@ port_init(uint8_t port)
 	rx_rings = (uint16_t)dev_info.max_rx_queues;
 	/* Configure ethernet device. */
 	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
-	if (retval != 0)
+	if (retval != 0) {
+		RTE_LOG(ERR, VHOST_PORT, "Failed to configure port %u: %s.\n",
+			port, strerror(-retval));
 		return retval;
+	}
 
 	/* Setup the queues. */
 	for (q = 0; q < rx_rings; q ++) {
@@ -341,21 +344,30 @@ port_init(uint8_t port)
 						rte_eth_dev_socket_id(port),
 						rxconf,
 						mbuf_pool);
-		if (retval < 0)
+		if (retval < 0) {
+			RTE_LOG(ERR, VHOST_PORT,
+				"Failed to setup rx queue %u of port %u: %s.\n",
+				q, port, strerror(-retval));
 			return retval;
+		}
 	}
 	for (q = 0; q < tx_rings; q ++) {
 		retval = rte_eth_tx_queue_setup(port, q, tx_ring_size,
 						rte_eth_dev_socket_id(port),
 						txconf);
-		if (retval < 0)
+		if (retval < 0) {
+			RTE_LOG(ERR, VHOST_PORT,
+				"Failed to setup tx queue %u of port %u: %s.\n",
+				q, port, strerror(-retval));
 			return retval;
+		}
 	}
 
 	/* Start the device. */
 	retval  = rte_eth_dev_start(port);
 	if (retval < 0) {
-		RTE_LOG(ERR, VHOST_DATA, "Failed to start the device.\n");
+		RTE_LOG(ERR, VHOST_PORT, "Failed to start port %u: %s\n",
+			port, strerror(-retval));
 		return retval;
 	}
 
-- 
2.1.4