ixgbe: Add support for multiple Tx queues for FCoE in 82599

This patch adds support for multiple transmit queues to the Fiber Channel
over Ethernet (FCoE) feature found in 82599. Currently, FCoE has multiple
Rx queues available, along with a redirection table, that helps distribute
the I/O load across multiple CPUs based on the FC exchange ID. To make
this the most effective, we need to provide the same layout of transmit
queues to match receive.

Particularly, when Data Center Bridging (DCB) is enabled, the designated
traffic class for FCoE can have dedicated queues for just FCoE traffic,
while not affecting any other type of traffic flow.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 6 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 47d9dde82a8a..a6bc1ef28f92 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -36,6 +36,7 @@
 #define BIT_PFC         0x02
 #define BIT_PG_RX       0x04
 #define BIT_PG_TX       0x08
+#define BIT_APP_UPCHG   0x10
 #define BIT_RESETLINK   0x40
 #define BIT_LINKSPEED   0x80
 
@@ -348,8 +349,14 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
                 while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
                         msleep(1);
 
-                if (netif_running(netdev))
-                        ixgbe_down(adapter);
+                if (adapter->dcb_set_bitmap & BIT_APP_UPCHG) {
+                        if (netif_running(netdev))
+                                netdev->netdev_ops->ndo_stop(netdev);
+                        ixgbe_clear_interrupt_scheme(adapter);
+                } else {
+                        if (netif_running(netdev))
+                                ixgbe_down(adapter);
+                }
         }
 
         ret = ixgbe_copy_dcb_cfg(&adapter->temp_dcb_cfg, &adapter->dcb_cfg,
@@ -373,8 +380,14 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
         }
 
         if (adapter->dcb_set_bitmap & BIT_RESETLINK) {
-                if (netif_running(netdev))
-                        ixgbe_up(adapter);
+                if (adapter->dcb_set_bitmap & BIT_APP_UPCHG) {
+                        ixgbe_init_interrupt_scheme(adapter);
+                        if (netif_running(netdev))
+                                netdev->netdev_ops->ndo_open(netdev);
+                } else {
+                        if (netif_running(netdev))
+                                ixgbe_up(adapter);
+                }
                 ret = DCB_HW_CHG_RST;
         } else if (adapter->dcb_set_bitmap & BIT_PFC) {
                 if (adapter->hw.mac.type == ixgbe_mac_82598EB)
@@ -526,8 +539,20 @@ static u8 ixgbe_dcbnl_setapp(struct net_device *netdev,
         switch (idtype) {
         case DCB_APP_IDTYPE_ETHTYPE:
 #ifdef IXGBE_FCOE
-                if (id == ETH_P_FCOE)
-                        rval = ixgbe_fcoe_setapp(netdev_priv(netdev), up);
+                if (id == ETH_P_FCOE) {
+                        u8 tc;
+                        struct ixgbe_adapter *adapter;
+
+                        adapter = netdev_priv(netdev);
+                        tc = adapter->fcoe.tc;
+                        rval = ixgbe_fcoe_setapp(adapter, up);
+                        if ((!rval) && (tc != adapter->fcoe.tc) &&
+                            (adapter->flags & IXGBE_FLAG_DCB_ENABLED) &&
+                            (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)) {
+                                adapter->dcb_set_bitmap |= BIT_APP_UPCHG;
+                                adapter->dcb_set_bitmap |= BIT_RESETLINK;
+                        }
+                }
 #endif
                 break;
         case DCB_APP_IDTYPE_PORTNUM: