Re: [PATCH net] octeontx2-af: nix: Export CN10K admin queue enqueue mbox handler

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issue(s) to consider:

Critical: 0 · High: 1 · Medium: 0 · Low: 0

- [High] New EXPORT_SYMBOL() with no in-tree consumer:
  `EXPORT_SYMBOL(rvu_mbox_handler_nix_cn10k_aq_enq)` is added in…

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octeontx2-af: nix: Export CN10K admin queue enqueue mbox handler

This adds EXPORT_SYMBOL() for rvu_mbox_handler_nix_cn10k_aq_enq() in the
octeontx2 AF driver, with the stated motivation that out-of-tree CN10K
modules fail to load with an unresolved symbol.

[Severity: High]
Is there an in-tree user for this new export?

Grepping under drivers/net/ethernet/marvell/octeontx2/ shows
rvu_mbox_handler_nix_cn10k_aq_enq is referenced only by its own definition
in rvu_nix.c and by the mailbox dispatch that the MBOX_MESSAGES M() list in
af/mbox.h expands inside rvu_process_mbox_msg() in af/rvu.c.

That dispatch lives in the same module as the handler, per af/Makefile:

    rvu_af-y := cgx.o rvu.o rvu_cgx.o rvu_npa.o rvu_nix.o \
		  rvu_reg.o rvu_npc.o rvu_debugfs.o ptp.o rvu_npc_fs.o \
		  ...

So how can the commit message's "causing unresolved symbol failures at
module load time" be reproduced with an in-tree configuration?  With
rvu_nix.o and the dispatch both linked into rvu_af, there does not appear to
be any mainline module that has to resolve this symbol at load time.

The commit message says the caller is out-of-tree:

    "rvu_mbox_handler_nix_cn10k_aq_enq() is used by out-of-tree CN10K
     modules but was not exported"

Would it make more sense to drop this hunk, or to post it together with the
in-tree driver that consumes it?  As it stands the export widens the AF
module ABI to include direct NIX admin-queue context programming, struct rvu
internals and the mailbox request layout struct nix_cn10k_aq_enq_req, with
nothing in the tree using it.

A related question on consistency: the sibling handler
rvu_mbox_handler_nix_cn20k_aq_enq() in af/cn20k/nix.c is not exported, while
rvu_mbox_handler_npa_cn20k_aq_enq() in af/cn20k/npa.c is.  Is the CN20K NIX
handler needed by the same out-of-tree modules, or is the intent to export
only this one?

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Sashiko AI review · https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260915072357.980485-1-rkannoth%40marvell.com