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i40e: improve locking of mac_filter_hash

Browse source 
i40e_config_vf_promiscuous_mode() calls
i40e_getnum_vf_vsi_vlan_filters() without acquiring the
mac_filter_hash_lock spinlock.

This is unsafe because mac_filter_hash may get altered in another thread
while i40e_getnum_vf_vsi_vlan_filters() traverses the hashes.

Simply adding the spinlock in i40e_getnum_vf_vsi_vlan_filters() is not
possible as it already gets called in i40e_get_vlan_list_sync() with the
spinlock held. Therefore adding a wrapper that acquires the spinlock and
call the correct function where appropriate.

Fixes: 37d318d780 ("i40e: Remove scheduling while atomic possibility")
Fix-suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Stefan Assmann 2021-03-04 10:34:30 +01:00 • committed by Tony Nguyen
parent 0d6835ffe5
commit 8b4b06919f
1 changed files with 20 additions and 3 deletions
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23
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
View file

@ -1160,12 +1160,12 @@ static int i40e_quiesce_vf_pci(struct i40e_vf *vf)
} }
/** /**
* i40e_getnum_vf_vsi_vlan_filters * __i40e_getnum_vf_vsi_vlan_filters
* @vsi: pointer to the vsi * @vsi: pointer to the vsi
* *
* called to get the number of VLANs offloaded on this VF * called to get the number of VLANs offloaded on this VF
**/ **/
static int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi) static int __i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi)
{ {
struct i40e_mac_filter *f; struct i40e_mac_filter *f;
u16 num_vlans = 0, bkt; u16 num_vlans = 0, bkt;
@ -1178,6 +1178,23 @@ static int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi)
return num_vlans; return num_vlans;
} }
/**
* i40e_getnum_vf_vsi_vlan_filters
* @vsi: pointer to the vsi
*
* wrapper for __i40e_getnum_vf_vsi_vlan_filters() with spinlock held
**/
static int i40e_getnum_vf_vsi_vlan_filters(struct i40e_vsi *vsi)
{
int num_vlans;
spin_lock_bh(&vsi->mac_filter_hash_lock);
num_vlans = __i40e_getnum_vf_vsi_vlan_filters(vsi);
spin_unlock_bh(&vsi->mac_filter_hash_lock);
return num_vlans;
}
/** /**
* i40e_get_vlan_list_sync * i40e_get_vlan_list_sync
* @vsi: pointer to the VSI * @vsi: pointer to the VSI
@ -1195,7 +1212,7 @@ static void i40e_get_vlan_list_sync(struct i40e_vsi *vsi, u16 *num_vlans,
int bkt; int bkt;
spin_lock_bh(&vsi->mac_filter_hash_lock); spin_lock_bh(&vsi->mac_filter_hash_lock);
*num_vlans = i40e_getnum_vf_vsi_vlan_filters(vsi); *num_vlans = __i40e_getnum_vf_vsi_vlan_filters(vsi);
*vlan_list = kcalloc(*num_vlans, sizeof(**vlan_list), GFP_ATOMIC); *vlan_list = kcalloc(*num_vlans, sizeof(**vlan_list), GFP_ATOMIC);
if (!(*vlan_list)) if (!(*vlan_list))
goto err; goto err;