[PATCH v2 8/9] net/mlx5: use common sysfs routines

[Stephen Hemminger <stephen@networkplumber.org>]

Read the bonding interface indexes with the EAL routine rather than
opening each file and parsing it with fscanf().

The index was read with fscanf("%u") and is now converted with base
0, so a value with a leading zero would parse as octal. The kernel
does not print ifindex with leading zeros.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/mlx5/linux/mlx5_ethdev_os.c | 17 +++++------------
 drivers/net/mlx5/linux/mlx5_os.c        | 13 +++++--------
 2 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/net/mlx5/linux/mlx5_ethdev_os.c b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
index 4bbc590e91..d1c03d66af 100644
--- a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
+++ b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
@@ -36,6 +36,7 @@
 #include <rte_string_fns.h>
 #include <rte_rwlock.h>
 #include <rte_cycles.h>
+#include <rte_sysfs.h>
 
 #include <mlx5_glue.h>
 #include <mlx5_devx_cmds.h>
@@ -1192,27 +1193,19 @@ mlx5_sysfs_bond_info(unsigned int pf_ifindex, unsigned int *ifindex,
 		     char *ifname)
 {
 	char name[IF_NAMESIZE];
-	FILE *file;
 	unsigned int index;
-	int ret;
+	unsigned long val;
 
 	if (!if_indextoname(pf_ifindex, name) || !strlen(name)) {
 		rte_errno = errno;
 		return -rte_errno;
 	}
-	MKSTR(bond_if, "/sys/class/net/%s/master/ifindex", name);
 	/* read bond ifindex */
-	file = fopen(bond_if, "rb");
-	if (file == NULL) {
-		rte_errno = errno;
-		return -rte_errno;
-	}
-	ret = fscanf(file, "%u", &index);
-	fclose(file);
-	if (ret <= 0) {
-		rte_errno = errno;
+	if (rte_sysfs_parse_uint(&val, "/sys/class/net/%s/master/ifindex", name) != 0) {
+		rte_errno = ENODEV;
 		return -rte_errno;
 	}
+	index = val;
 	if (ifindex)
 		*ifindex = index;
 
diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index adc5878296..203e9339bb 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -29,6 +29,7 @@
 #include <rte_string_fns.h>
 #include <rte_alarm.h>
 #include <rte_eal_paging.h>
+#include <rte_sysfs.h>
 
 #include <mlx5_glue.h>
 #include <mlx5_devx_cmds.h>
@@ -2103,6 +2104,7 @@ mlx5_device_bond_pci_match(const struct ibv_device *ibdev,
 		char tmp_str[IF_NAMESIZE + 32];
 		struct rte_pci_addr pci_addr;
 		struct mlx5_switch_info	info;
+		unsigned long val;
 		int ret;
 
 		/* Process slave interface names in the loop. */
@@ -2140,15 +2142,10 @@ mlx5_device_bond_pci_match(const struct ibv_device *ibdev,
 			break;
 		}
 		/* Get ifindex. */
-		snprintf(tmp_str, sizeof(tmp_str),
-			 "/sys/class/net/%s/ifindex", ifname);
-		file = fopen(tmp_str, "rb");
-		if (!file)
-			break;
-		ret = fscanf(file, "%u", &ifindex);
-		fclose(file);
-		if (ret != 1)
+		if (rte_sysfs_parse_uint(&val, "/sys/class/net/%s/ifindex",
+				ifname) != 0)
 			break;
+		ifindex = val;
 		/* Save bonding info. */
 		snprintf(bond_info->ports[info.port_name].ifname,
 			 sizeof(bond_info->ports[0].ifname), "%s", ifname);
-- 
2.53.0