i40e: Limit the number of MAC and VLAN addresses that can be added for VFs

If the VF is privileged/trusted it can do as it may please including
but not limited to hogging resources and playing unfair.
But if the VF is not privileged/trusted it still can add some number
(8) of MAC and VLAN addresses.
Other restrictions with respect to Port VLAN and normal VLAN still apply
to not privileged/trusted VF.

Change-Id: I3a9529201b184c8873e1ad2e300aff468c9e6296
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 4c365d7..a8a65e0 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1831,6 +1831,10 @@ error_param:
                                      (u8 *)&stats, sizeof(stats));
 }
 
+/* If the VF is not trusted restrict the number of MAC/VLAN it can program */
+#define I40E_VC_MAX_MAC_ADDR_PER_VF 8
+#define I40E_VC_MAX_VLAN_PER_VF 8
+
 /**
  * i40e_check_vf_permission
  * @vf: pointer to the VF info
@@ -1863,6 +1867,11 @@ 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;
 }
@@ -1924,6 +1933,8 @@ static int i40e_vc_add_mac_addr_msg(struct i40e_vf *vf, u8 *msg, u16 msglen)
                        ret = I40E_ERR_PARAM;
                        spin_unlock_bh(&vsi->mac_filter_list_lock);
                        goto error_param;
+               } else {
+                       vf->num_mac++;
                }
        }
        spin_unlock_bh(&vsi->mac_filter_list_lock);
@@ -1982,6 +1993,8 @@ static int i40e_vc_del_mac_addr_msg(struct i40e_vf *vf, u8 *msg, u16 msglen)
                        ret = I40E_ERR_INVALID_MAC_ADDR;
                        spin_unlock_bh(&vsi->mac_filter_list_lock);
                        goto error_param;
+               } else {
+                       vf->num_mac--;
                }
 
        spin_unlock_bh(&vsi->mac_filter_list_lock);
@@ -2016,8 +2029,13 @@ 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_STAT_ACTIVE, &vf->vf_states) ||
-           !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps) ||
            !i40e_vc_isvalid_vsi_id(vf, vsi_id)) {
                aq_ret = I40E_ERR_PARAM;
                goto error_param;
@@ -2041,6 +2059,8 @@ static int i40e_vc_add_vlan_msg(struct i40e_vf *vf, u8 *msg, u16 msglen)
        for (i = 0; i < vfl->num_elements; i++) {
                /* add new VLAN filter */
                int ret = i40e_vsi_add_vlan(vsi, vfl->vlan_id[i]);
+               if (!ret)
+                       vf->num_vlan++;
 
                if (test_bit(I40E_VF_STAT_UC_PROMISC, &vf->vf_states))
                        i40e_aq_set_vsi_uc_promisc_on_vlan(&pf->hw, vsi->seid,
@@ -2083,7 +2103,6 @@ static int i40e_vc_remove_vlan_msg(struct i40e_vf *vf, u8 *msg, u16 msglen)
        int i;
 
        if (!test_bit(I40E_VF_STAT_ACTIVE, &vf->vf_states) ||
-           !test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps) ||
            !i40e_vc_isvalid_vsi_id(vf, vsi_id)) {
                aq_ret = I40E_ERR_PARAM;
                goto error_param;
@@ -2104,6 +2123,8 @@ static int i40e_vc_remove_vlan_msg(struct i40e_vf *vf, u8 *msg, u16 msglen)
 
        for (i = 0; i < vfl->num_elements; i++) {
                int ret = i40e_vsi_kill_vlan(vsi, vfl->vlan_id[i]);
+               if (!ret)
+                       vf->num_vlan--;
 
                if (test_bit(I40E_VF_STAT_UC_PROMISC, &vf->vf_states))
                        i40e_aq_set_vsi_uc_promisc_on_vlan(&pf->hw, vsi->seid,

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
index 8cbf579..bf54873 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h
@@ -111,6 +111,9 @@ struct i40e_vf {
        bool link_forced;
        bool link_up;           /* only valid if VF link is forced */
        bool spoofchk;
+       u16 num_mac;
+       u16 num_vlan;
+
        /* RDMA Client */
        struct i40e_virtchnl_iwarp_qvlist_info *qvlist_info;
 };