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: dev@dpdk.org
Reporter: yanglanp...@bytedance.com
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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