DCB: Add interface to query the state of PFC feature.

Adds a netlink interface for Data Center Bridging (DCB) to get and set
the enable state of the Priority Flow Control (PFC) feature.
Primarily, this is a way to turn off PFC in the driver while DCB
remains enabled.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 5921795f8403..dd940a8f9357 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -405,6 +405,18 @@ static u8 ixgbe_dcbnl_setnumtcs(struct net_device *netdev, int tcid, u8 num)
         return -EINVAL;
 }
 
+static u8 ixgbe_dcbnl_getpfcstate(struct net_device *netdev)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        return !!(adapter->flags & IXGBE_FLAG_DCB_ENABLED);
+}
+
+static void ixgbe_dcbnl_setpfcstate(struct net_device *netdev, u8 state)
+{
+        return;
+}
+
 struct dcbnl_rtnl_ops dcbnl_ops = {
         .getstate       = ixgbe_dcbnl_get_state,
         .setstate       = ixgbe_dcbnl_set_state,
@@ -422,6 +434,8 @@ struct dcbnl_rtnl_ops dcbnl_ops = {
         .setall         = ixgbe_dcbnl_set_all,
         .getcap         = ixgbe_dcbnl_getcap,
         .getnumtcs      = ixgbe_dcbnl_getnumtcs,
-        .setnumtcs      = ixgbe_dcbnl_setnumtcs
+        .setnumtcs      = ixgbe_dcbnl_setnumtcs,
+        .getpfcstate    = ixgbe_dcbnl_getpfcstate,
+        .setpfcstate    = ixgbe_dcbnl_setpfcstate
 };