patch 'net/mlx5: fix sysfs port name translation' has been queued to stable release 22.11.2

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 22.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 04/11/23. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://git.dpdk.org/dpdk-stable/log/?h=22.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/log/?h=22.11-staging/commit/2fe7fcc1a35b392a1e1903a2d047829621744c8d

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From 2fe7fcc1a35b392a1e1903a2d047829621744c8d Mon Sep 17 00:00:00 2001
From: Bing Zhao <bingz at nvidia.com>
Date: Thu, 23 Mar 2023 12:54:14 +0200
Subject: [PATCH] net/mlx5: fix sysfs port name translation
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit f8a226ed65fa1c6e085fb0d5a91bab7fb5034aec ]

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.

The tailing carriage return character should be removed before
calling the mlx5_translate_port_name(), this was already done in the
NL message handling. In the meanwhile, the possible incorrect line
feed character is also taken into consideration.

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

Signed-off-by: Bing Zhao <bingz at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_ethdev_os.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/linux/mlx5_ethdev_os.c b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
index f1ff6f49f9..55801534d1 100644
--- a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
+++ b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
@@ -1035,7 +1035,8 @@ int
 mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 {
 	char ifname[IF_NAMESIZE];
-	char port_name[IF_NAMESIZE];
+	char *port_name = NULL;
+	size_t port_name_size = 0;
 	FILE *file;
 	struct mlx5_switch_info data = {
 		.master = 0,
@@ -1048,6 +1049,7 @@ mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 	bool port_switch_id_set = false;
 	bool device_dir = false;
 	char c;
+	ssize_t line_size;
 
 	if (!if_indextoname(ifindex, ifname)) {
 		rte_errno = errno;
@@ -1063,8 +1065,21 @@ mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 
 	file = fopen(phys_port_name, "rb");
 	if (file != NULL) {
-		if (fgets(port_name, IF_NAMESIZE, file) != NULL)
+		char *tail_nl;
+
+		line_size = getline(&port_name, &port_name_size, file);
+		if (line_size < 0) {
+			fclose(file);
+			rte_errno = errno;
+			return -rte_errno;
+		} else if (line_size > 0) {
+			/* Remove tailing newline character. */
+			tail_nl = strchr(port_name, '\n');
+			if (tail_nl)
+				*tail_nl = '\0';
 			mlx5_translate_port_name(port_name, &data);
+		}
+		free(port_name);
 		fclose(file);
 	}
 	file = fopen(phys_switch_id, "rb");
-- 
2.25.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2023-04-09 21:45:42.165751400 +0800
+++ 0133-net-mlx5-fix-sysfs-port-name-translation.patch	2023-04-09 21:45:38.809042200 +0800
@@ -1 +1 @@
-From f8a226ed65fa1c6e085fb0d5a91bab7fb5034aec Mon Sep 17 00:00:00 2001
+From 2fe7fcc1a35b392a1e1903a2d047829621744c8d Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit f8a226ed65fa1c6e085fb0d5a91bab7fb5034aec ]
@@ -21 +23,0 @@
-Cc: stable at dpdk.org