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Date: Fri, 29 Sep 2017 09:13:25 +0000
From: wangyunjian <wangyunjian@...wei.com>
To: Alexander Duyck <alexander.duyck@...il.com>
CC: David Miller <davem@...emloft.net>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
Netdev <netdev@...r.kernel.org>, caihe <caihe@...wei.com>,
intel-wired-lan <intel-wired-lan@...ts.osuosl.org>
Subject: RE: [Intel-wired-lan] [PATCH net v2] i40e: Fix limit imprecise of
the number of MAC/VLAN that can be added for VFs
> -----Original Message-----
> From: Alexander Duyck [mailto:alexander.duyck@...il.com]
> Sent: Thursday, September 28, 2017 11:44 PM
> To: wangyunjian <wangyunjian@...wei.com>
> Cc: David Miller <davem@...emloft.net>; Jeff Kirsher
> <jeffrey.t.kirsher@...el.com>; Sergei Shtylyov
> <sergei.shtylyov@...entembedded.com>; Netdev
> <netdev@...r.kernel.org>; caihe <caihe@...wei.com>; intel-wired-lan
> <intel-wired-lan@...ts.osuosl.org>
> Subject: Re: [Intel-wired-lan] [PATCH net v2] i40e: Fix limit imprecise of the
> number of MAC/VLAN that can be added for VFs
>
> On Wed, Sep 27, 2017 at 7:01 PM, w00273186 <wangyunjian@...wei.com>
> wrote:
> > From: Yunjian Wang <wangyunjian@...wei.com>
> >
> > Now it doesn't limit the number of MAC/VLAN strictly. When there is more
> > elements in the virtchnl MAC/VLAN list, it can still add successfully.
>
> You could still add but should you. I'm not clear from this patch
> description what this is supposed to be addressing. If you enable the
> "trust" flag for a VF via the "ip link set dev <iface> vf <vfnum>
> trust on" it can make use of any resources on the device, but without
> that there is an upper limit that is supposed to be enforced to
> prevent the VF from making use of an excessive amount of resources.
> That is what is being enforced by the code you are moving out of the
> way below.
I don't enable the "trust" flag for a VF. But this script can successfully add
MACs more than I40E_VC_MAX_MAC_ADDR_PER_VF(12) in VM. It has
same problem with VLAN.
Test script:
for((i=10;i<50;i++))
do
ipmaddr add 01:00:5e:01:02:$i dev eth0
done
for ((i=1;i<40;i++))
do
ip link add link eth0 name eth0.$i type vlan id $i
done
>
> > Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
> > ---
> > drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 27 +++++++++++++--
> -------
> > 1 file changed, 16 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> > index 4d1e670..285b96a 100644
> > --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> > +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> > @@ -2065,11 +2065,6 @@ static inline int i40e_check_vf_permission(struct
> i40e_vf *vf, u8 *macaddr)
> > dev_err(&pf->pdev->dev,
> > "VF attempting to override administratively set MAC address,
> reload the VF driver to resume normal operation\n");
> > ret = -EPERM;
> > - } else if ((vf->num_mac >= I40E_VC_MAX_MAC_ADDR_PER_VF) &&
> > - !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps)) {
> > - dev_err(&pf->pdev->dev,
> > - "VF is not trusted, switch the VF to trusted to add more
> functionality\n");
> > - ret = -EPERM;
> > }
> > return ret;
> > }
> > @@ -2128,6 +2123,15 @@ static int i40e_vc_add_mac_addr_msg(struct
> i40e_vf *vf, u8 *msg, u16 msglen)
> > } else {
> > vf->num_mac++;
> > }
> > +
> > + if ((vf->num_mac >= I40E_VC_MAX_MAC_ADDR_PER_VF) &&
> > + !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps)) {
> > + dev_err(&pf->pdev->dev,
> > + "VF is not trusted, switch the VF to trusted to add more
> functionality\n");
> > + ret = -EPERM;
> > + spin_unlock_bh(&vsi->mac_filter_hash_lock);
> > + goto error_param;
> > + }
> > }
> > spin_unlock_bh(&vsi->mac_filter_hash_lock);
> >
>
> This doesn't make any sense. You are doing the checks after you have
> already added the MAC. The only part you aren't doing is sending the
> message to the VF indicating that the request was successful.
>
> > @@ -2221,12 +2225,6 @@ static int i40e_vc_add_vlan_msg(struct i40e_vf
> *vf, u8 *msg, u16 msglen)
> > i40e_status aq_ret = 0;
> > int i;
> >
> > - if ((vf->num_vlan >= I40E_VC_MAX_VLAN_PER_VF) &&
> > - !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps)) {
> > - dev_err(&pf->pdev->dev,
> > - "VF is not trusted, switch the VF to trusted to add more VLAN
> addresses\n");
> > - goto error_param;
> > - }
> > if (!test_bit(I40E_VF_STATE_ACTIVE, &vf->vf_states) ||
> > !i40e_vc_isvalid_vsi_id(vf, vsi_id)) {
> > aq_ret = I40E_ERR_PARAM;
> > @@ -2269,6 +2267,13 @@ static int i40e_vc_add_vlan_msg(struct i40e_vf
> *vf, u8 *msg, u16 msglen)
> > dev_err(&pf->pdev->dev,
> > "Unable to add VLAN filter %d for VF %d, error %d\n",
> > vfl->vlan_id[i], vf->vf_id, ret);
> > + if ((vf->num_vlan >= I40E_VC_MAX_VLAN_PER_VF) &&
> > + !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps)) {
> > + dev_err(&pf->pdev->dev,
> > + "VF is not trusted, switch the VF to trusted to add more
> VLAN addresses\n");
> > + aq_ret = -EPERM;
> > + goto error_param;
> > + }
> > }
> >
> > error_param:
>
> Same here. You are doing this after the call to i40e_vsi_add_vlan. The
> code makes no sense here. This bit of code is supposed to be
> preventing a VF from abusing resources if the VF is not privelaged.
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