netdev - [PATCH iwl-next 1/2] ice: Schedule service task in IRQ top half

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Date: Fri, 24 Nov 2023 12:41:54 +0100
From: Karol Kolacinski <karol.kolacinski@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com,
	jesse.brandeburg@...el.com,
	Karol Kolacinski <karol.kolacinski@...el.com>,
	Michal Michalik <michal.michalik@...el.com>
Subject: [PATCH iwl-next 1/2] ice: Schedule service task in IRQ top half

Schedule service task and EXTTS in the top half to avoid bottom half
scheduling if possible, which significantly reduces timestamping delay.

Co-developed-by: Michal Michalik <michal.michalik@...el.com>
Signed-off-by: Michal Michalik <michal.michalik@...el.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice.h      |  1 -
 drivers/net/ethernet/intel/ice/ice_main.c | 18 ++++++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 3ea33947b878..d5a8da0c02c3 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -517,7 +517,6 @@ enum ice_pf_flags {
 };
 
 enum ice_misc_thread_tasks {
-	ICE_MISC_THREAD_EXTTS_EVENT,
 	ICE_MISC_THREAD_TX_TSTAMP,
 	ICE_MISC_THREAD_NBITS		/* must be last */
 };
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 1f159b4362ec..6b91ec6f420d 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3078,6 +3078,7 @@ static void ice_ena_misc_vector(struct ice_pf *pf)
 static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 {
 	struct ice_pf *pf = (struct ice_pf *)data;
+	irqreturn_t ret = IRQ_HANDLED;
 	struct ice_hw *hw = &pf->hw;
 	struct device *dev;
 	u32 oicr, ena_mask;
@@ -3161,6 +3162,8 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 		ena_mask &= ~PFINT_OICR_TSYN_TX_M;
 		if (ice_ptp_pf_handles_tx_interrupt(pf))
 			set_bit(ICE_MISC_THREAD_TX_TSTAMP, pf->misc_thread);
+			ret = IRQ_WAKE_THREAD;
+		}
 	}
 
 	if (oicr & PFINT_OICR_TSYN_EVNT_M) {
@@ -3176,7 +3179,7 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 					       GLTSYN_STAT_EVENT1_M |
 					       GLTSYN_STAT_EVENT2_M);
 
-			set_bit(ICE_MISC_THREAD_EXTTS_EVENT, pf->misc_thread);
+			ice_ptp_extts_event(pf);
 		}
 	}
 
@@ -3199,8 +3202,11 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 			set_bit(ICE_PFR_REQ, pf->state);
 		}
 	}
+	ice_service_task_schedule(pf);
+	if (ret == IRQ_HANDLED)
+		ice_irq_dynamic_ena(hw, NULL, NULL);
 
-	return IRQ_WAKE_THREAD;
+	return ret;
 }
 
 /**
@@ -3216,12 +3222,7 @@ static irqreturn_t ice_misc_intr_thread_fn(int __always_unused irq, void *data)
 	hw = &pf->hw;
 
 	if (ice_is_reset_in_progress(pf->state))
-		return IRQ_HANDLED;
-
-	ice_service_task_schedule(pf);
-
-	if (test_and_clear_bit(ICE_MISC_THREAD_EXTTS_EVENT, pf->misc_thread))
-		ice_ptp_extts_event(pf);
+		goto skip_irq;
 
 	if (test_and_clear_bit(ICE_MISC_THREAD_TX_TSTAMP, pf->misc_thread)) {
 		/* Process outstanding Tx timestamps. If there is more work,
@@ -3233,6 +3234,7 @@ static irqreturn_t ice_misc_intr_thread_fn(int __always_unused irq, void *data)
 		}
 	}
 
+skip_irq:
 	ice_irq_dynamic_ena(hw, NULL, NULL);
 
 	return IRQ_HANDLED;

base-commit: 2f5380161e527b085e3a0b1c4898810ef35d4240
-- 
2.40.1