[PATCH] common/mlx5: fix the sysfs port name translation

[Bing Zhao <bingz@nvidia.com>]

With some OFED or upstream kernel of mlx5, the port name fetched from
"/sys/class/net/[DEV]/phys_port_name" may have a tailing "\n" as the
EOL. The sscanf() will return the scanned items number with this EOL.

In such case, the "equal to" condition is considered as false and
the function mlx5_translate_port_name() will recognize the port type
wrongly with UNKNOWN result.

By changing the condition from "equal to" to "more than or equal
to", the port type can be recognized successfully.

Fixes: 654810b56828 ("common/mlx5: share Netlink commands")
Fixes: 420bbdae89f2 ("net/mlx5: fix host physical function representor naming")

Signed-off-by: Bing Zhao <bingz@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/common/mlx5/linux/mlx5_common_os.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c b/drivers/common/mlx5/linux/mlx5_common_os.c
index aafff60eeb..655347a7c8 100644
--- a/drivers/common/mlx5/linux/mlx5_common_os.c
+++ b/drivers/common/mlx5/linux/mlx5_common_os.c
@@ -108,7 +108,7 @@ mlx5_translate_port_name(const char *port_name_in,
 	sc_items = sscanf(port_name_in, "%c%c%d%c%c%d%c",
 			  &pf_c1, &pf_c2, &port_info_out->pf_num,
 			  &vf_c1, &vf_c2, &port_info_out->port_name, &eol);
-	if (sc_items == 6 && pf_c1 == 'p' && pf_c2 == 'f') {
+	if (sc_items >= 6 && pf_c1 == 'p' && pf_c2 == 'f') {
 		if (vf_c1 == 'v' && vf_c2 == 'f') {
 			/* Kernel ver >= 5.0 or OFED ver >= 4.6 */
 			port_info_out->name_type =
@@ -128,7 +128,7 @@ mlx5_translate_port_name(const char *port_name_in,
 	 */
 	sc_items = sscanf(port_name_in, "%c%d%c",
 			  &pf_c1, &port_info_out->port_name, &eol);
-	if (sc_items == 2 && pf_c1 == 'p') {
+	if (sc_items >= 2 && pf_c1 == 'p') {
 		port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK;
 		return;
 	}
@@ -138,7 +138,7 @@ mlx5_translate_port_name(const char *port_name_in,
 	 */
 	sc_items = sscanf(port_name_in, "%c%c%d%c",
 			  &pf_c1, &pf_c2, &port_info_out->pf_num, &eol);
-	if (sc_items == 3 && pf_c1 == 'p' && pf_c2 == 'f') {
+	if (sc_items >= 3 && pf_c1 == 'p' && pf_c2 == 'f') {
 		port_info_out->port_name = -1;
 		port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFHPF;
 		return;
-- 
2.21.0