devlink: Support DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE

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>
Signed-off-by: David Ahern <dsahern@kernel.org>

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 35128083376e3e83a8ffb175588333a30338a51e..fd9fac216e45f0d3cdb61cb606560d7433c9d2c4 100644 (file)
--- 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>";
        }
 }