DCB: Add interface to query # of TCs supported by device

Adds interface for Data Center Bridging (DCB) to query (and set if
supported) the number of traffic classes currently supported by the
device for the two (DCB) features: priority groups (PG) and priority
flow control (PFC).

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, 32 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index eb3a6cea1aaa..5921795f8403 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -376,6 +376,35 @@ static u8 ixgbe_dcbnl_getcap(struct net_device *netdev, int capid, u8 *cap)
         return rval;
 }
 
+static u8 ixgbe_dcbnl_getnumtcs(struct net_device *netdev, int tcid, u8 *num)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+        u8 rval = 0;
+
+        if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+                switch (tcid) {
+                case DCB_NUMTCS_ATTR_PG:
+                        *num = MAX_TRAFFIC_CLASS;
+                        break;
+                case DCB_NUMTCS_ATTR_PFC:
+                        *num = MAX_TRAFFIC_CLASS;
+                        break;
+                default:
+                        rval = -EINVAL;
+                        break;
+                }
+        } else {
+                rval = -EINVAL;
+        }
+
+        return rval;
+}
+
+static u8 ixgbe_dcbnl_setnumtcs(struct net_device *netdev, int tcid, u8 num)
+{
+        return -EINVAL;
+}
+
 struct dcbnl_rtnl_ops dcbnl_ops = {
         .getstate       = ixgbe_dcbnl_get_state,
         .setstate       = ixgbe_dcbnl_set_state,
@@ -391,6 +420,8 @@ struct dcbnl_rtnl_ops dcbnl_ops = {
         .setpfccfg      = ixgbe_dcbnl_set_pfc_cfg,
         .getpfccfg      = ixgbe_dcbnl_get_pfc_cfg,
         .setall         = ixgbe_dcbnl_set_all,
-        .getcap         = ixgbe_dcbnl_getcap
+        .getcap         = ixgbe_dcbnl_getcap,
+        .getnumtcs      = ixgbe_dcbnl_getnumtcs,
+        .setnumtcs      = ixgbe_dcbnl_setnumtcs
 };