diff mbox series

[net-next,10/15] i40e: Fix crash caused by stress setting of VF MAC addresses

Message ID 20190821201623.5506-11-jeffrey.t.kirsher@intel.com
State Changes Requested
Delegated to: David Miller
Headers show
Series 40GbE Intel Wired LAN Driver Updates 2019-08-21 | expand

Commit Message

Kirsher, Jeffrey T Aug. 21, 2019, 8:16 p.m. UTC 
From: Slawomir Laba <slawomirx.laba@intel.com>

Add update to the VSI pointer passed to the i40e_set_vf_mac function.
If VF is in reset state the driver waits in i40e_set_vf_mac function
for the reset to be complete, yet after reset the vsi pointer
that was passed into this function is no longer valid.

The patch updates local VSI pointer directly from pf->vsi array,
by using the id stored in VF pointer (lan_vsi_idx).

Without this commit the driver might occasionally invoke general
protection fault in kernel and disable the OS entirely.

Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 4601f9e4e998..f8aa4deceb5e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3967,10 +3967,15 @@  int i40e_ndo_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac)
 	/* When the VF is resetting wait until it is done.
 	 * It can take up to 200 milliseconds,
 	 * but wait for up to 300 milliseconds to be safe.
+	 * If the VF is indeed in reset, the vsi pointer has
+	 * to show on the newly loaded vsi under pf->vsi[id].
 	 */
 	for (i = 0; i < 15; i++) {
-		if (test_bit(I40E_VF_STATE_INIT, &vf->vf_states))
+		if (test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) {
+			if (i > 0)
+				vsi = pf->vsi[vf->lan_vsi_idx];
 			break;
+		}
 		msleep(20);
 	}
 	if (!test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) {