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authorJesse Brandeburg <jesse.brandeburg@intel.com>2013-09-28 07:13:08 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2013-10-22 05:33:43 -0700
commit1022cb6c35a8c815549566473504ac5feb0b5889 (patch)
tree95892e3c53e3a6dfa89a3a81ecf78e0fcf49648f
parentMerge branch 'sit_tso' (diff)
downloadlinux-dev-1022cb6c35a8c815549566473504ac5feb0b5889.tar.xz
linux-dev-1022cb6c35a8c815549566473504ac5feb0b5889.zip
i40e: do not flush after re-enabling interrupts
Hot path doesn't need read-flush after interrupt enable, and this flush really causes a lot of extra cpu utilization. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_main.c3
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_txrx.c2
2 files changed, 2 insertions, 3 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index fbe7fe2914a9..69ed8014afbd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2560,7 +2560,7 @@ void i40e_irq_dynamic_enable(struct i40e_vsi *vsi, int vector)
I40E_PFINT_DYN_CTLN_CLEARPBA_MASK |
(I40E_ITR_NONE << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT);
wr32(hw, I40E_PFINT_DYN_CTLN(vector - 1), val);
- i40e_flush(hw);
+ /* skip the flush */
}
/**
@@ -2709,6 +2709,7 @@ static int i40e_vsi_enable_irq(struct i40e_vsi *vsi)
i40e_irq_dynamic_enable_icr0(pf);
}
+ i40e_flush(&pf->hw);
return 0;
}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index dc89e72fd0f4..fbc40cd29d23 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -559,8 +559,6 @@ static void i40e_update_dynamic_itr(struct i40e_q_vector *q_vector)
i40e_set_new_dynamic_itr(&q_vector->tx);
if (old_itr != q_vector->tx.itr)
wr32(hw, reg_addr, q_vector->tx.itr);
-
- i40e_flush(hw);
}
/**