i40e: Delete queue channel for ADq on VF

This patch takes care of freeing up all the VSIs, queues and
other ADq related software and hardware resources, when a user
requests for deletion of ADq on VF.

Example command:
tc qdisc del dev eth0 root

Signed-off-by: Avinash Dayanand <avinash.dayanand@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 7452d43..a5565d0 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1673,6 +1673,27 @@ static int i40e_vc_get_version_msg(struct i40e_vf *vf, u8 *msg)
 }
 
 /**
+ * i40e_del_qch - delete all the additional VSIs created as a part of ADq
+ * @vf: pointer to VF structure
+ **/
+static void i40e_del_qch(struct i40e_vf *vf)
+{
+       struct i40e_pf *pf = vf->pf;
+       int i;
+
+       /* first element in the array belongs to primary VF VSI and we shouldn't
+        * delete it. We should however delete the rest of the VSIs created
+        */
+       for (i = 1; i < vf->num_tc; i++) {
+               if (vf->ch[i].vsi_idx) {
+                       i40e_vsi_release(pf->vsi[vf->ch[i].vsi_idx]);
+                       vf->ch[i].vsi_idx = 0;
+                       vf->ch[i].vsi_id = 0;
+               }
+       }
+}
+
+/**
  * i40e_vc_get_vf_resources_msg
  * @vf: pointer to the VF info
  * @msg: pointer to the msg buffer
@@ -2979,6 +3000,45 @@ err:
 }
 
 /**
+ * i40e_vc_del_qch_msg
+ * @vf: pointer to the VF info
+ * @msg: pointer to the msg buffer
+ **/
+static int i40e_vc_del_qch_msg(struct i40e_vf *vf, u8 *msg)
+{
+       struct i40e_pf *pf = vf->pf;
+       i40e_status aq_ret = 0;
+
+       if (!test_bit(I40E_VF_STATE_ACTIVE, &vf->vf_states)) {
+               aq_ret = I40E_ERR_PARAM;
+               goto err;
+       }
+
+       if (vf->adq_enabled) {
+               i40e_del_qch(vf);
+               vf->adq_enabled = false;
+               vf->num_tc = 0;
+               dev_info(&pf->pdev->dev,
+                        "Deleting Queue Channels for ADq on VF %d\n",
+                        vf->vf_id);
+       } else {
+               dev_info(&pf->pdev->dev, "VF %d trying to delete queue channels but ADq isn't enabled\n",
+                        vf->vf_id);
+               aq_ret = I40E_ERR_PARAM;
+       }
+
+       /* reset the VF in order to allocate resources */
+       i40e_vc_notify_vf_reset(vf);
+       i40e_reset_vf(vf, false);
+
+       return I40E_SUCCESS;
+
+err:
+       return i40e_vc_send_resp_to_vf(vf, VIRTCHNL_OP_DISABLE_CHANNELS,
+                                      aq_ret);
+}
+
+/**
  * i40e_vc_process_vf_msg
  * @pf: pointer to the PF structure
  * @vf_id: source VF id
@@ -3110,6 +3170,9 @@ int i40e_vc_process_vf_msg(struct i40e_pf *pf, s16 vf_id, u32 v_opcode,
        case VIRTCHNL_OP_ENABLE_CHANNELS:
                ret = i40e_vc_add_qch_msg(vf, msg);
                break;
+       case VIRTCHNL_OP_DISABLE_CHANNELS:
+               ret = i40e_vc_del_qch_msg(vf, msg);
+               break;
        case VIRTCHNL_OP_UNKNOWN:
        default:
                dev_err(&pf->pdev->dev, "Unsupported opcode %d from VF %d\n",