From 8187cd485b1a74b6ae258786b9ade3ecaafec318 Mon Sep 17 00:00:00 2001
From: John Fastabend <john.r.fastabend@intel.com>
Date: Wed, 23 Feb 2011 05:58:08 +0000
Subject: [PATCH] ixgbe: DCB: enable RSS to be used with DCB
RSS had previously been disabled when DCB was enabled because
DCB was single queued per traffic class. Now that DCB implements
multiple Tx/Rx rings per traffic class enable RSS.
Here RSS hashes across the queues in the traffic class.
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>
---
drivers/net/ixgbe/ixgbe_dcb_nl.c | 2 --
drivers/net/ixgbe/ixgbe_main.c | 32 +++++++++++++++++++++++++-------
2 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index b7b6db3bbd59..91ff51c53b04 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -129,7 +129,6 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
netdev->netdev_ops->ndo_stop(netdev);
ixgbe_clear_interrupt_scheme(adapter);
- adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
switch (adapter->hw.mac.type) {
case ixgbe_mac_82598EB:
adapter->last_lfc_mode = adapter->hw.fc.current_mode;
@@ -162,7 +161,6 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
adapter->temp_dcb_cfg.pfc_mode_enable = false;
adapter->dcb_cfg.pfc_mode_enable = false;
adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
- adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
switch (adapter->hw.mac.type) {
case ixgbe_mac_82599EB:
case ixgbe_mac_X540:
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 3ce0f4f956df..be2e145646bf 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2892,17 +2892,20 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
);
switch (mask) {
+#ifdef CONFIG_IXGBE_DCB
+ case (IXGBE_FLAG_DCB_ENABLED | IXGBE_FLAG_RSS_ENABLED):
+ mrqc = IXGBE_MRQC_RTRSS8TCEN;
+ break;
+ case (IXGBE_FLAG_DCB_ENABLED):
+ mrqc = IXGBE_MRQC_RT8TCEN;
+ break;
+#endif /* CONFIG_IXGBE_DCB */
case (IXGBE_FLAG_RSS_ENABLED):
mrqc = IXGBE_MRQC_RSSEN;
break;
case (IXGBE_FLAG_SRIOV_ENABLED):
mrqc = IXGBE_MRQC_VMDQEN;
break;
-#ifdef CONFIG_IXGBE_DCB
- case (IXGBE_FLAG_DCB_ENABLED):
- mrqc = IXGBE_MRQC_RT8TCEN;
- break;
-#endif /* CONFIG_IXGBE_DCB */
default:
break;
}
@@ -3672,6 +3675,23 @@ static void ixgbe_configure_dcb(struct ixgbe_adapter *adapter)
/* reconfigure the hardware */
ixgbe_dcb_hw_config(hw, &adapter->dcb_cfg);
+
+ /* Enable RSS Hash per TC */
+ if (hw->mac.type != ixgbe_mac_82598EB) {
+ int i;
+ u32 reg = 0;
+
+ for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+ u8 msb = 0;
+ u8 cnt = adapter->netdev->tc_to_txq[i].count;
+
+ while (cnt >>= 1)
+ msb++;
+
+ reg |= msb << IXGBE_RQTC_SHIFT_TC(i);
+ }
+ IXGBE_WRITE_REG(hw, IXGBE_RQTC, reg);
+ }
}
#endif
@@ -7343,8 +7363,6 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
adapter->flags &= ~(IXGBE_FLAG_RSS_ENABLED |
IXGBE_FLAG_DCB_ENABLED);
- if (adapter->flags & IXGBE_FLAG_DCB_ENABLED)
- adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
#ifdef CONFIG_IXGBE_DCB
netdev->dcbnl_ops = &dcbnl_ops;
--
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