[next,S82-V4,2/9] i40evf: Clean-up flags for promisc mode to avoid high polling rate

Message ID 20171114120052.86665-2-alice.michael@intel.com
State Under Review
Delegated to: Jeff Kirsher
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Series
  • [next,S82-V4,1/9] i40evf: Do not clear MSI-X PBA manually
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Commit Message

Alice Michael Nov. 14, 2017, noon
From: Alexander Duyck <alexander.h.duyck@intel.com>

If you enabled and disabled promiscuous mode on a VF you could easily put
it into a state where it would start firing interrupts on all queues at a
rate of 50+ interrupts per second even though there was no traffic present.
The issue seems to have been a stray admin queue feature flag set that was
leaving us in a high polling rate for the adminq task.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Bowers, AndrewX Nov. 16, 2017, 10:19 p.m. | #1
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On
> Behalf Of Alice Michael
> Sent: Tuesday, November 14, 2017 4:01 AM
> To: Michael, Alice <alice.michael@intel.com>; intel-wired-
> lan@lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH S82-V4 2/9] i40evf: Clean-up flags for
> promisc mode to avoid high polling rate
> 
> From: Alexander Duyck <alexander.h.duyck@intel.com>
> 
> If you enabled and disabled promiscuous mode on a VF you could easily put it
> into a state where it would start firing interrupts on all queues at a rate of 50+
> interrupts per second even though there was no traffic present.
> The issue seems to have been a stray admin queue feature flag set that was
> leaving us in a high polling rate for the adminq task.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> ---
>  drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>

Patch

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
index 2719a05..feb95b6 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
@@ -739,8 +739,10 @@  void i40evf_set_promiscuous(struct i40evf_adapter *adapter, int flags)
 	}
 
 	if (!flags) {
-		adapter->flags &= ~I40EVF_FLAG_PROMISC_ON;
-		adapter->aq_required &= ~I40EVF_FLAG_AQ_RELEASE_PROMISC;
+		adapter->flags &= ~(I40EVF_FLAG_PROMISC_ON |
+				    I40EVF_FLAG_ALLMULTI_ON);
+		adapter->aq_required &= ~(I40EVF_FLAG_AQ_RELEASE_PROMISC |
+					  I40EVF_FLAG_AQ_RELEASE_ALLMULTI);
 		dev_info(&adapter->pdev->dev, "Leaving promiscuous mode\n");
 	}