[dpdk-stable] [PATCH] common/mlx5: fix physical port name pattern recognition

[Viacheslav Ovsiienko]

This patch makes the Infiniband device physical port name
recognition more strict. Currently mlx5 PMD might recognize
the names like "pf0sf0" erroneously as "pf0" and the wrong
device type (host PF representor) is reported.

The names like "pf0sf0" belong to PCI subfunctions which
is currently not supported by mlx5 PMD and this false
recognition must be eliminated.

Fixes: 420bbdae89f2 ("net/mlx5: fix host physical function representor naming")
Cc: stable at dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>
---
 drivers/common/mlx5/linux/mlx5_common_os.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c b/drivers/common/mlx5/linux/mlx5_common_os.c
index e74aa89..7bb3ba6 100644
--- a/drivers/common/mlx5/linux/mlx5_common_os.c
+++ b/drivers/common/mlx5/linux/mlx5_common_os.c
@@ -89,7 +89,7 @@
 mlx5_translate_port_name(const char *port_name_in,
 			 struct mlx5_switch_info *port_info_out)
 {
-	char pf_c1, pf_c2, vf_c1, vf_c2;
+	char pf_c1, pf_c2, vf_c1, vf_c2, eol;
 	char *end;
 	int sc_items;
 
@@ -97,9 +97,9 @@
 	 * Check for port-name as a string of the form pf0vf0
 	 * (support kernel ver >= 5.0 or OFED ver >= 4.6).
 	 */
-	sc_items = sscanf(port_name_in, "%c%c%d%c%c%d",
+	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);
+			  &vf_c1, &vf_c2, &port_info_out->port_name, &eol);
 	if (sc_items == 6 &&
 	    pf_c1 == 'p' && pf_c2 == 'f' &&
 	    vf_c1 == 'v' && vf_c2 == 'f') {
@@ -110,8 +110,8 @@
 	 * Check for port-name as a string of the form p0
 	 * (support kernel ver >= 5.0, or OFED ver >= 4.6).
 	 */
-	sc_items = sscanf(port_name_in, "%c%d",
-			  &pf_c1, &port_info_out->port_name);
+	sc_items = sscanf(port_name_in, "%c%d%c",
+			  &pf_c1, &port_info_out->port_name, &eol);
 	if (sc_items == 2 && pf_c1 == 'p') {
 		port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK;
 		return;
@@ -120,8 +120,8 @@
 	 * Check for port-name as a string of the form pf0
 	 * (support kernel ver >= 5.7 for HPF representor on BF).
 	 */
-	sc_items = sscanf(port_name_in, "%c%c%d",
-			  &pf_c1, &pf_c2, &port_info_out->pf_num);
+	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') {
 		port_info_out->port_name = -1;
 		port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFHPF;
-- 
1.8.3.1