[DPDK/doc Bug 1485] Checksum function should require the whole packet to be on one segment

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1485

            Bug ID: 1485
           Summary: Checksum function should require the whole packet to
                    be on one segment
           Product: DPDK
           Version: 24.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: doc
          Assignee: dev at dpdk.org
          Reporter: user202729 at protonmail.com
  Target Milestone: ---

The function rte_ipv4_udptcp_cksum (and probably also
rte_ipv4_udptcp_cksum_verify ) does not work properly when the header is taken
from a mbuf that consist of multiple segments.

I suggest editing the documentation to say e.g. "if the header is taken from a
mbuf with e.g. rte_pktmbuf_mtod which potentially consist of multiple segments,
use rte_ipv4_udptcp_cksum_mbuf instead."

Related:
https://inbox.dpdk.org/dev/20211015051306.320328-1-xiaoyun.li@intel.com/T/

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