netdev - [net-next v2 11/15] i40evf: Clean-up flags for promisc mode to avoid high polling rate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180109161930.75657-12-jeffrey.t.kirsher@intel.com>
Date:   Tue,  9 Jan 2018 08:19:26 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Alexander Duyck <alexander.h.duyck@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next v2 11/15] i40evf: Clean-up flags for promisc mode to avoid high polling rate

From: Alexander Duyck <alexander.h.duyck@...el.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@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
index 2719a057b211..feb95b62a077 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");
 	}
 
-- 
2.15.1