---
title: MBUF_CSUM_DID_DATA
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1644526-anonymous/mbuf_csum_did_data
---

# MBUF_CSUM_DID_DATA

## Declaration

```occ
MBUF_CSUM_DID_DATA = 0x0400
```

## Discussion

Discussion Indicates that the TCP or UDP checksum was calculated. The value for the checksum calculated in hardware should be passed as the second parameter of mbuf_set_csum_performed. The hardware calculated checksum value can be retrieved using the second parameter passed to mbuf_get_csum_performed. This should be done for IPv4 or IPv6.