[PATCH iproute2] devlink: Support DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE

[Saeed Mahameed <saeed@kernel.org>]

From: Saeed Mahameed <saeedm@nvidia.com>

Add support for the new inactive switchdev mode [1].

A user can start the eswitch in switchdev or switchdev_inactive mode.

Active: Traffic is enabled on this eswitch FDB.
Inactive: Traffic is ignored/dropped on this eswitch FDB.

An example use case:
$ devlink dev eswitch set pci/0000:08:00.1 mode switchdev_inactive
Setup FDB pipeline and netdev representors
...
Once ready to start receiving traffic
$ devlink dev eswitch set pci/0000:08:00.1 mode switchdev

[1] https://lore.kernel.org/all/20251107000831.157375-1-saeed@kernel.org/

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 devlink/devlink.c            | 7 ++++++-
 include/uapi/linux/devlink.h | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 35128083..fd9fac21 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -45,6 +45,7 @@
 
 #define ESWITCH_MODE_LEGACY "legacy"
 #define ESWITCH_MODE_SWITCHDEV "switchdev"
+#define ESWITCH_MODE_SWITCHDEV_INACTIVE "switchdev_inactive"
 #define ESWITCH_INLINE_MODE_NONE "none"
 #define ESWITCH_INLINE_MODE_LINK "link"
 #define ESWITCH_INLINE_MODE_NETWORK "network"
@@ -1428,6 +1429,8 @@ static int eswitch_mode_get(const char *typestr,
 		*p_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 	} else if (strcmp(typestr, ESWITCH_MODE_SWITCHDEV) == 0) {
 		*p_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
+	} else if (strcmp(typestr, ESWITCH_MODE_SWITCHDEV_INACTIVE) == 0) {
+		*p_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE;
 	} else {
 		pr_err("Unknown eswitch mode \"%s\"\n", typestr);
 		return -EINVAL;
@@ -2848,7 +2851,7 @@ static bool dl_dump_filter(struct dl *dl, struct nlattr **tb)
 static void cmd_dev_help(void)
 {
 	pr_err("Usage: devlink dev show [ DEV ]\n");
-	pr_err("       devlink dev eswitch set DEV [ mode { legacy | switchdev } ]\n");
+	pr_err("       devlink dev eswitch set DEV [ mode { legacy | switchdev | switchdev_inactive } ]\n");
 	pr_err("                               [ inline-mode { none | link | network | transport } ]\n");
 	pr_err("                               [ encap-mode { none | basic } ]\n");
 	pr_err("       devlink dev eswitch show DEV\n");
@@ -3284,6 +3287,8 @@ static const char *eswitch_mode_name(uint32_t mode)
 	switch (mode) {
 	case DEVLINK_ESWITCH_MODE_LEGACY: return ESWITCH_MODE_LEGACY;
 	case DEVLINK_ESWITCH_MODE_SWITCHDEV: return ESWITCH_MODE_SWITCHDEV;
+	case DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE:
+		return ESWITCH_MODE_SWITCHDEV_INACTIVE;
 	default: return "<unknown mode>";
 	}
 }
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index bcd5fde1..317c088b 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -181,6 +181,7 @@ enum devlink_sb_threshold_type {
 enum devlink_eswitch_mode {
 	DEVLINK_ESWITCH_MODE_LEGACY,
 	DEVLINK_ESWITCH_MODE_SWITCHDEV,
+	DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE,
 };
 
 enum devlink_eswitch_inline_mode {
-- 
2.51.1