Commit 1022cb6c authored by Jesse Brandeburg's avatar Jesse Brandeburg Committed by Jeff Kirsher
Browse files

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: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: default avatarKavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent bda301c9

drivers/net/ethernet/intel/i40e/i40e_main.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

}

drivers/net/ethernet/intel/i40e/i40e_txrx.c

+0 −2
Original line number Diff line number Diff line
@@ -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);

}



/**

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