bnxt_en: Return standard Linux error codes for hwrm flow cmds.

Currently, internal error value is returned by the driver, when
hwrm_cfa_flow_alloc() fails due lack of resources.  We should be returning
Linux errno value -ENOSPC instead.

This patch also converts other similar command errors to standard Linux errno
code (-EIO) in bnxt_tc.c

Fixes: db1d36a ("bnxt_en: add TC flower offload flow_alloc/free FW cmds")
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

@@ -349,6 +349,9 @@ static int bnxt_hwrm_cfa_flow_free(struct bnxt *bp, __le16 flow_handle)
 	if (rc)
 		netdev_info(bp->dev, "Error: %s: flow_handle=0x%x rc=%d",
 			    __func__, flow_handle, rc);
+
+	if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -484,13 +487,15 @@ static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow,
 	req.action_flags = cpu_to_le16(action_flags);
 
 	mutex_lock(&bp->hwrm_cmd_lock);
-
 	rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 	if (!rc)
 		*flow_handle = resp->flow_handle;
-
 	mutex_unlock(&bp->hwrm_cmd_lock);
 
+	if (rc == HWRM_ERR_CODE_RESOURCE_ALLOC_ERROR)
+		rc = -ENOSPC;
+	else if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -561,6 +566,8 @@ static int hwrm_cfa_decap_filter_alloc(struct bnxt *bp,
 		netdev_info(bp->dev, "%s: Error rc=%d", __func__, rc);
 	mutex_unlock(&bp->hwrm_cmd_lock);
 
+	if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -576,6 +583,9 @@ static int hwrm_cfa_decap_filter_free(struct bnxt *bp,
 	rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 	if (rc)
 		netdev_info(bp->dev, "%s: Error rc=%d", __func__, rc);
+
+	if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -624,6 +634,8 @@ static int hwrm_cfa_encap_record_alloc(struct bnxt *bp,
 		netdev_info(bp->dev, "%s: Error rc=%d", __func__, rc);
 	mutex_unlock(&bp->hwrm_cmd_lock);
 
+	if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -639,6 +651,9 @@ static int hwrm_cfa_encap_record_free(struct bnxt *bp,
 	rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 	if (rc)
 		netdev_info(bp->dev, "%s: Error rc=%d", __func__, rc);
+
+	if (rc)
+		rc = -EIO;
 	return rc;
 }
 
@@ -1338,8 +1353,10 @@ bnxt_hwrm_cfa_flow_stats_get(struct bnxt *bp, int num_flows,
 	} else {
 		netdev_info(bp->dev, "error rc=%d", rc);
 	}
-
 	mutex_unlock(&bp->hwrm_cmd_lock);
+
+	if (rc)
+		rc = -EIO;
 	return rc;
 }