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Message-ID: <CY4PR11MB157684F676290E6B6544F961AB1B9@CY4PR11MB1576.namprd11.prod.outlook.com>
Date: Tue, 6 Jul 2021 08:05:24 +0000
From: "Jankowski, Konrad0" <konrad0.jankowski@...el.com>
To: Stefan Assmann <sassmann@...nic.de>,
"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "pabeni@...hat.com" <pabeni@...hat.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH] i40e: improve locking of
mac_filter_hash
> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Stefan Assmann
> Sent: czwartek, 4 marca 2021 10:35
> To: intel-wired-lan@...ts.osuosl.org
> Cc: pabeni@...hat.com; netdev@...r.kernel.org; sassmann@...nic.de
> Subject: [Intel-wired-lan] [PATCH] i40e: improve locking of mac_filter_hash
>
> 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: 37d318d7805f ("i40e: Remove scheduling while atomic possibility")
> Fix-suggested-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Stefan Assmann <sassmann@...nic.de>
> ---
> .../ethernet/intel/i40e/i40e_virtchnl_pf.c | 23 ++++++++++++++++---
> 1 file changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index 1b6ec9be155a..61d3e9a00f65 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -1101,12 +1101,12 @@ 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
> *
> * 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;
> u16 num_vlans = 0, bkt;
> @@ -1119,6 +1119,23 @@ static int i40e_getnum_vf_vsi_vlan_filters(struct
> i40e_vsi *vsi)
> 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
> * @vsi: pointer to the VSI
> @@ -1136,7 +1153,7 @@ static void i40e_get_vlan_list_sync(struct i40e_vsi
> *vsi, u16 *num_vlans,
> int bkt;
>
> 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);
> if (!(*vlan_list))
> goto err;
> --
> 2.29.2
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
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