rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mbuf split mode.

https://bugs.dpdk.org/show_bug.cgi?id=1761

Bug ID: 1761
Summary: rte_raw_cksum_mbuf obtain incorrect cksum when a
packet in mbuf split mode.
Product: DPDK
Version: unspecified
Hardware: All
OS: Linux
Status: UNCONFIRMED
Severity: critical
Priority: Normal
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

Hi.

This issue is about calc cksum, in rte_raw_cksum_mbuf function, when the packet data is stored in multiple mbufs, below code easy overflow.

File rte_cksum.h

    line 159: if (done & 1)
    line 160:     tmp = rte_bswap16((uint16_t)tmp); 
    line 161: sum += tmp;

The tmp(uint32_t) variable can easily be greater than 0xFFFF, so (uint16_t)tmp will discard the high 16bit, cause incorrect result.

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