From: Július Milan <jmilan.dev@gmail.com>
Date: Fri, 12 Jul 2019 07:55:46 +0000 (+0200)
Subject: net/af_xdp: fix handling of not supported feature
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=06bb59f6b4a34a181b81147cc424e7c4685d7624;p=dpdk.git

net/af_xdp: fix handling of not supported feature

Procedure xdp_get_channels_info was returning error code -1 in case of
ioctl command SIOCETHTOOL was not supported. This patch sets return
value back to 0 as it is valid case.

Fixes: 339b88c6a91f ("net/af_xdp: support multi-queue")

Signed-off-by: Július Milan <jmilan.dev@gmail.com>
Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>
---

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index ff8e90589e..33352e10a7 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -852,9 +852,13 @@ xdp_get_channels_info(const char *if_name, int *max_queues,
 	ifr.ifr_data = (void *)&channels;
 	strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
 	ret = ioctl(fd, SIOCETHTOOL, &ifr);
-	if (ret && errno != EOPNOTSUPP) {
-		ret = -errno;
-		goto out;
+	if (ret) {
+		if (errno == EOPNOTSUPP) {
+			ret = 0;
+		} else {
+			ret = -errno;
+			goto out;
+		}
 	}
 
 	if (channels.max_combined == 0 || errno == EOPNOTSUPP) {