[dpdk-dev] [PATCH] net/af_xdp: fix xdp_get_channels_info return value

["Július Milan" <jmilan.dev@gmail.com>]

Procedure xdp_get_channels_info was returning error code -1 in case of
unsupported ioctl command SIOCETHTOOL. This patch sets return
value back to 0 as it is valid case.

Fixes: 339b88c6a9 ("net/af_xdp: support multi-queue")

Signed-off-by: Július Milan <jmilan.dev@gmail.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c
b/drivers/net/af_xdp/rte_eth_af_xdp.c
index ff8e90589..33352e10a 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) {
-- 
2.21.0