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ice: Add support for dynamic interrupt moderation

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Currently there is no support for dynamic interrupt moderation. This
patch adds some initial code to support this. The following changes
were made:

1. Currently we are using multiple members to store the interrupt
   granularity (itr_gran_25/50/100/200). This is not necessary because
   we can query the device to determine what the interrupt granularity
   should be set to, done by a new function ice_get_itr_intrl_gran.

2. Added intrl to ice_q_vector structure to support interrupt rate
   limiting.

3. Added the function ice_intrl_usecs_to_reg for converting to a value
   in usecs that the device understands.

4. Added call to write to the GLINT_RATE register. Disable intrl by
   default for now.

5. Changed rx/tx_itr_setting to itr_setting because having both seems
   redundant because a ring is either Tx or Rx.

6. Initialize itr_setting for both Tx/Rx rings in ice_vsi_alloc_rings()

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Brett Creeley
2018-09-19 17:23:19 -07:00
committed by Jeff Kirsher
parent ca4929b6df
commit 9e4ab4c29a
7 changed files with 102 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/net/ethernet/intel/ice/ice_common.c
View File

@@ -597,6 +597,39 @@ void ice_output_fw_log(struct ice_hw *hw, struct ice_aq_desc *desc, void *buf)
ice_debug(hw, ICE_DBG_AQ_MSG, "[ FW Log Msg End ]\n");
}
/**
* ice_get_itr_intrl_gran - determine int/intrl granularity
* @hw: pointer to the hw struct
*
* Determines the itr/intrl granularities based on the maximum aggregate
* bandwidth according to the device's configuration during power-on.
*/
static enum ice_status ice_get_itr_intrl_gran(struct ice_hw *hw)
{
u8 max_agg_bw = (rd32(hw, GL_PWR_MODE_CTL) &
GL_PWR_MODE_CTL_CAR_MAX_BW_M) >>
GL_PWR_MODE_CTL_CAR_MAX_BW_S;
switch (max_agg_bw) {
case ICE_MAX_AGG_BW_200G:
case ICE_MAX_AGG_BW_100G:
case ICE_MAX_AGG_BW_50G:
hw->itr_gran = ICE_ITR_GRAN_ABOVE_25;
hw->intrl_gran = ICE_INTRL_GRAN_ABOVE_25;
break;
case ICE_MAX_AGG_BW_25G:
hw->itr_gran = ICE_ITR_GRAN_MAX_25;
hw->intrl_gran = ICE_INTRL_GRAN_MAX_25;
break;
default:
ice_debug(hw, ICE_DBG_INIT,
"Failed to determine itr/intrl granularity\n");
return ICE_ERR_CFG;
}
return 0;
}
/**
* ice_init_hw - main hardware initialization routine
* @hw: pointer to the hardware structure
@@ -621,11 +654,9 @@ enum ice_status ice_init_hw(struct ice_hw *hw)
if (status)
return status;
/* set these values to minimum allowed */
hw->itr_gran_200 = ICE_ITR_GRAN_MIN_200;
hw->itr_gran_100 = ICE_ITR_GRAN_MIN_100;
hw->itr_gran_50 = ICE_ITR_GRAN_MIN_50;
hw->itr_gran_25 = ICE_ITR_GRAN_MIN_25;
status = ice_get_itr_intrl_gran(hw);
if (status)
return status;
status = ice_init_all_ctrlq(hw);
if (status)