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ch4/ofi: clean up am request data structures
Pull Request Description
Different fields in the request hdr are used in different functionality. For example, some fields are used as data buffer during am send. Some fields are used to track rdma read. Some fields are used to issue fi_read. These data fields should be split into a specific data structures to avoid confusing its usage or even corrupt its data. [skip warnings]
Author Checklist
- [x] Provide Description Particularly focus on why, not what. Reference background, issues, test failures, xfail entries, etc.
- [x] Commits Follow Good Practice
Commits are self-contained and do not do two things at once.
Commit message is of the form:
module: short descriptionCommit message explains what's in the commit. - [ ] Passes All Tests Whitespace checker. Warnings test. Additional tests via comments.
- [x] Contribution Agreement For non-Argonne authors, check contribution agreement. If necessary, request an explicit comment from your companies PR approval manager.
