6.1-stable review patch. If anyone has any objections, please let me know.
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From: Michal Swiatkowski michal.swiatkowski@linux.intel.com
[ Upstream commit ee7d79433d783346430ee32f28c9df44a88b3bb6 ]
First case:
ip l a l $VF name vlanx type vlan id 100 ip l d vlanx ip l a l $VF name vlanx type vlan id 100
As workqueue can be execute after sometime, there is a window to have call trace like that: - iavf_del_vlan - iavf_add_vlan - iavf_del_vlans (wq)
It means that our VLAN 100 will change the state from IAVF_VLAN_ACTIVE to IAVF_VLAN_REMOVE (iavf_del_vlan). After that in iavf_add_vlan state won't be changed because VLAN 100 is on the filter list. The final result is that the VLAN 100 filter isn't added in hardware (no iavf_add_vlans call).
To fix that change the state if the filter wasn't removed yet directly to active. It is save as IAVF_VLAN_REMOVE means that virtchnl message wasn't sent yet.
Second case:
ip l a l $VF name vlanx type vlan id 100
Any type of VF reset ex. change trust
ip l s $PF vf $VF_NUM trust on ip l d vlanx ip l a l $VF name vlanx type vlan id 100
In case of reset iavf driver is responsible for readding all filters that are being used. To do that all VLAN filters state are changed to IAVF_VLAN_ADD. Here is even longer window for changing VLAN state from kernel side, as workqueue isn't called immediately. We can have call trace like that:
- changing to IAVF_VLAN_ADD (after reset) - iavf_del_vlan (called from kernel ops) - iavf_del_vlans (wq)
Not exsisitng VLAN filters will be removed from hardware. It isn't a bug, ice driver will handle it fine. However, we can have call trace like that:
- changing to IAVF_VLAN_ADD (after reset) - iavf_del_vlan (called from kernel ops) - iavf_add_vlan (called from kernel ops) - iavf_del_vlans (wq)
With fix for previous case we end up with no VLAN filters in hardware. We have to remove VLAN filters if the state is IAVF_VLAN_ADD and delete VLAN was called. It is save as IAVF_VLAN_ADD means that virtchnl message wasn't sent yet.
Fixes: 0c0da0e95105 ("iavf: refactor VLAN filter states") Signed-off-by: Michal Swiatkowski michal.swiatkowski@linux.intel.com Reviewed-by: Przemek Kitszel przemyslaw.kitszel@intel.com Tested-by: Rafal Romanowski rafal.romanowski@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/iavf/iavf_main.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c index 53b9fe35d8035..7119bce4c091a 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_main.c +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c @@ -830,6 +830,11 @@ iavf_vlan_filter *iavf_add_vlan(struct iavf_adapter *adapter, f->state = IAVF_VLAN_ADD; adapter->num_vlan_filters++; iavf_schedule_aq_request(adapter, IAVF_FLAG_AQ_ADD_VLAN_FILTER); + } else if (f->state == IAVF_VLAN_REMOVE) { + /* IAVF_VLAN_REMOVE means that VLAN wasn't yet removed. + * We can safely only change the state here. + */ + f->state = IAVF_VLAN_ACTIVE; }
clearout: @@ -850,8 +855,18 @@ static void iavf_del_vlan(struct iavf_adapter *adapter, struct iavf_vlan vlan)
f = iavf_find_vlan(adapter, vlan); if (f) { - f->state = IAVF_VLAN_REMOVE; - iavf_schedule_aq_request(adapter, IAVF_FLAG_AQ_DEL_VLAN_FILTER); + /* IAVF_ADD_VLAN means that VLAN wasn't even added yet. + * Remove it from the list. + */ + if (f->state == IAVF_VLAN_ADD) { + list_del(&f->list); + kfree(f); + adapter->num_vlan_filters--; + } else { + f->state = IAVF_VLAN_REMOVE; + iavf_schedule_aq_request(adapter, + IAVF_FLAG_AQ_DEL_VLAN_FILTER); + } }
spin_unlock_bh(&adapter->mac_vlan_list_lock);