ixgbe: Use 1TC DCB instead of disabling DCB for MSI and legacy interrupts

This change makes it so that we can use 1TC DCB in the case of MSI and
legacy interrupts.  The advantage to this is that it allows us to fully
support FCoE w/ DCB instead of having to drop to link flow control only
when using these interrupt modes.

Cc: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
index 29a2a8528073e8d3da7571650fed78de259010f8..17ecbcedd5481d0dcafa46138839088478cbf2c6 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
@@ -1065,11 +1065,27 @@ static void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
                        return;
        }
 
-       adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
+       /* disable DCB if number of TCs exceeds 1 */
+       if (netdev_get_num_tc(adapter->netdev) > 1) {
+               e_err(probe, "num TCs exceeds number of queues - disabling DCB\n");
+               netdev_reset_tc(adapter->netdev);
 
+               if (adapter->hw.mac.type == ixgbe_mac_82598EB)
+                       adapter->hw.fc.requested_mode = adapter->last_lfc_mode;
+
+               adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
+               adapter->temp_dcb_cfg.pfc_mode_enable = false;
+               adapter->dcb_cfg.pfc_mode_enable = false;
+       }
+       adapter->dcb_cfg.num_tcs.pg_tcs = 1;
+       adapter->dcb_cfg.num_tcs.pfc_tcs = 1;
+
+       /* disable SR-IOV */
        ixgbe_disable_sriov(adapter);
 
+       /* disable RSS */
        adapter->ring_feature[RING_F_RSS].limit = 1;
+
        ixgbe_set_num_queues(adapter);
        adapter->num_q_vectors = 1;
 

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 30699815451cf58a9a26604850c0c3c7f026dd6f..3b6784cf134a8159892f133342f981eb7ad3413f 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6703,12 +6703,6 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
        struct ixgbe_adapter *adapter = netdev_priv(dev);
        struct ixgbe_hw *hw = &adapter->hw;
 
-       /* Multiple traffic classes requires multiple queues */
-       if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) {
-               e_err(drv, "Enable failed, needs MSI-X\n");
-               return -EINVAL;
-       }
-
        /* Hardware supports up to 8 traffic classes */
        if (tc > adapter->dcb_cfg.num_tcs.pg_tcs ||
            (hw->mac.type == ixgbe_mac_82598EB &&