ixgbe: DCB X540 devices support max traffic class of 4

X540 devices can only support up to 4 traffic classes and
guarantee a "lossless" traffic class on some platforms.
This patch sets the X540 devices to initialize a max
traffic class value of 4 at probe time.

Signed-off-by: John Fastabend <john.r.fastabend@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_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 2b8ff95..1f936c8 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4990,17 +4990,32 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
        spin_lock_init(&adapter->fdir_perfect_lock);
 
 #ifdef CONFIG_IXGBE_DCB
+       switch (hw->mac.type) {
+       case ixgbe_mac_X540:
+               adapter->dcb_cfg.num_tcs.pg_tcs = X540_TRAFFIC_CLASS;
+               adapter->dcb_cfg.num_tcs.pfc_tcs = X540_TRAFFIC_CLASS;
+               break;
+       default:
+               adapter->dcb_cfg.num_tcs.pg_tcs = MAX_TRAFFIC_CLASS;
+               adapter->dcb_cfg.num_tcs.pfc_tcs = MAX_TRAFFIC_CLASS;
+               break;
+       }
+
        /* Configure DCB traffic classes */
        for (j = 0; j < MAX_TRAFFIC_CLASS; j++) {
                tc = &adapter->dcb_cfg.tc_config[j];
                tc->path[DCB_TX_CONFIG].bwg_id = 0;
                tc->path[DCB_TX_CONFIG].bwg_percent = 12 + (j & 1);
-               tc->path[DCB_TX_CONFIG].up_to_tc_bitmap = 1 << j;
                tc->path[DCB_RX_CONFIG].bwg_id = 0;
                tc->path[DCB_RX_CONFIG].bwg_percent = 12 + (j & 1);
-               tc->path[DCB_RX_CONFIG].up_to_tc_bitmap = 1 << j;
                tc->dcb_pfc = pfc_disabled;
        }
+
+       /* Initialize default user to priority mapping, UPx->TC0 */
+       tc = &adapter->dcb_cfg.tc_config[0];
+       tc->path[DCB_TX_CONFIG].up_to_tc_bitmap = 0xFF;
+       tc->path[DCB_RX_CONFIG].up_to_tc_bitmap = 0xFF;
+
        adapter->dcb_cfg.bw_percentage[DCB_TX_CONFIG][0] = 100;
        adapter->dcb_cfg.bw_percentage[DCB_RX_CONFIG][0] = 100;
        adapter->dcb_cfg.pfc_mode_enable = false;
@@ -7019,7 +7034,7 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
        }
 
        /* Hardware supports up to 8 traffic classes */
-       if (tc > MAX_TRAFFIC_CLASS ||
+       if (tc > adapter->dcb_cfg.num_tcs.pg_tcs ||
            (hw->mac.type == ixgbe_mac_82598EB && tc < MAX_TRAFFIC_CLASS))
                return -EINVAL;
 

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index baad0cb..4ea909c 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -406,6 +406,7 @@
 
 /* DCB registers */
 #define MAX_TRAFFIC_CLASS        8
+#define X540_TRAFFIC_CLASS       4
 #define IXGBE_RMCS      0x03D00
 #define IXGBE_DPMCS     0x07F40
 #define IXGBE_PDPMCS    0x0CD00