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 ff8e905..33352e1 100644 (file)
--- 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) {