i40e/virtchnl: refactor code for validate checks

This change updates the arguments passed to the validate function
and fixes the caller, as well as uses the new return values added to
virtchnl.h

One other minor tweak, remove a duplicate set to zero of valid_len.

This is in preparation for moving the function to virtchnl.h.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -2536,15 +2536,16 @@ static int i40e_vc_set_rss_hena(struct i40e_vf *vf, u8 *msg, u16 msglen)
 
 /**
  * i40e_vc_validate_vf_msg
- * @vf: pointer to the VF info
+ * @ver: Virtchnl version info
+ * @v_opcode: Opcode for the message
  * @msg: pointer to the msg buffer
  * @msglen: msg length
- * @msghndl: msg handle
  *
- * validate msg
+ * validate msg format against struct for each opcode
  **/
-static int i40e_vc_validate_vf_msg(struct i40e_vf *vf, u32 v_opcode,
-				   u32 v_retval, u8 *msg, u16 msglen)
+static int
+i40e_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
+			u8 *msg, u16 msglen)
 {
 	bool err_msg_format = false;
 	int valid_len = 0;
@@ -2557,7 +2558,7 @@ static int i40e_vc_validate_vf_msg(struct i40e_vf *vf, u32 v_opcode,
 	case VIRTCHNL_OP_RESET_VF:
 		break;
 	case VIRTCHNL_OP_GET_VF_RESOURCES:
-		if (VF_IS_V11(&vf->vf_ver))
+		if (VF_IS_V11(ver))
 			valid_len = sizeof(u32);
 		break;
 	case VIRTCHNL_OP_CONFIG_TX_QUEUE:
@@ -2633,7 +2634,6 @@ static int i40e_vc_validate_vf_msg(struct i40e_vf *vf, u32 v_opcode,
 			err_msg_format = true;
 		break;
 	case VIRTCHNL_OP_RELEASE_IWARP_IRQ_MAP:
-		valid_len = 0;
 		break;
 	case VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP:
 		valid_len = sizeof(struct virtchnl_iwarp_qvlist_info);
@@ -2673,15 +2673,13 @@ static int i40e_vc_validate_vf_msg(struct i40e_vf *vf, u32 v_opcode,
 	case VIRTCHNL_OP_EVENT:
 	case VIRTCHNL_OP_UNKNOWN:
 	default:
-		return -EPERM;
+		return VIRTCHNL_ERR_PARAM;
 	}
 	/* few more checks */
-	if ((valid_len != msglen) || (err_msg_format)) {
-		i40e_vc_send_resp_to_vf(vf, v_opcode, I40E_ERR_PARAM);
-		return -EINVAL;
-	} else {
+	if ((valid_len != msglen) || (err_msg_format))
+		return VIRTCHNL_STATUS_ERR_OPCODE_MISMATCH;
+
 	return 0;
-	}
 }
 
 /**
@@ -2713,7 +2711,7 @@ int i40e_vc_process_vf_msg(struct i40e_pf *pf, s16 vf_id, u32 v_opcode,
 		return I40E_ERR_PARAM;
 
 	/* perform basic checks on the msg */
-	ret = i40e_vc_validate_vf_msg(vf, v_opcode, v_retval, msg, msglen);
+	ret = i40e_vc_validate_vf_msg(&vf->vf_ver, v_opcode, msg, msglen);
 
 	/* perform additional checks specific to this driver */
 	if (v_opcode == VIRTCHNL_OP_CONFIG_RSS_KEY) {
@@ -2729,9 +2727,15 @@ int i40e_vc_process_vf_msg(struct i40e_pf *pf, s16 vf_id, u32 v_opcode,
 	}
 
 	if (ret) {
+		i40e_vc_send_resp_to_vf(vf, v_opcode, I40E_ERR_PARAM);
 		dev_err(&pf->pdev->dev, "Invalid message from VF %d, opcode %d, len %d\n",
 			local_vf_id, v_opcode, msglen);
-		return ret;
+		switch (ret) {
+		case VIRTCHNL_ERR_PARAM:
+			return -EPERM;
+		default:
+			return -EINVAL;
+		}
 	}
 
 	switch (v_opcode) {

include/linux/avf/virtchnl.h

@@ -53,6 +53,23 @@
  * its queues, optionally add MAC and VLAN filters, and process traffic.
  */
 
+/* START GENERIC DEFINES
+ * Need to ensure the following enums and defines hold the same meaning and
+ * value in current and future projects
+ */
+
+/* Error Codes */
+enum virtchnl_status_code {
+	VIRTCHNL_STATUS_SUCCESS				= 0,
+	VIRTCHNL_ERR_PARAM				= -5,
+	VIRTCHNL_STATUS_ERR_OPCODE_MISMATCH		= -38,
+	VIRTCHNL_STATUS_ERR_CQP_COMPL_ERROR		= -39,
+	VIRTCHNL_STATUS_ERR_INVALID_VF_ID		= -40,
+	VIRTCHNL_STATUS_NOT_SUPPORTED			= -64,
+};
+
+/* END GENERIC DEFINES */
+
 /* Opcodes for VF-PF communication. These are placed in the v_opcode field
  * of the virtchnl_msg structure.
  */