net/core: Add VF link state control

Add netlink directives and ndo entry to allow for controling
VF link, which can be in one of three states:

Auto - VF link state reflects the PF link state (default)

Up - VF link state is up, traffic from VF to VF works even if
the actual PF link is down

Down - VF link state is down, no traffic from/to this VF, can be of
use while configuring the VF

Signed-off-by: Rony Efraim <ronye@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index da05a2698cb5..03f6170ab337 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -338,6 +338,7 @@ enum {
         IFLA_VF_VLAN,
         IFLA_VF_TX_RATE,        /* TX Bandwidth Allocation */
         IFLA_VF_SPOOFCHK,       /* Spoof Checking on/off switch */
+        IFLA_VF_LINK_STATE,     /* link state enable/disable/auto switch */
         __IFLA_VF_MAX,
 };
 
@@ -364,6 +365,18 @@ struct ifla_vf_spoofchk {
         __u32 setting;
 };
 
+enum {
+        IFLA_VF_LINK_STATE_AUTO,        /* link state of the uplink */
+        IFLA_VF_LINK_STATE_ENABLE,      /* link always up */
+        IFLA_VF_LINK_STATE_DISABLE,     /* link always down */
+        __IFLA_VF_LINK_STATE_MAX,
+};
+
+struct ifla_vf_link_state {
+        __u32 vf;
+        __u32 link_state;
+};
+
 /* VF ports management section
  *
  *      Nested layout of set/get msg is: