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Subject: RE: DPDK libs as one big shared object
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Date: Wed, 18 Jun 2025 09:39:07 +0200
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Thread-Topic: DPDK libs as one big shared object
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From: =?iso-8859-1?Q?Morten_Br=F8rup?= <mb@smartsharesystems.com>
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Cc: "Tomasz Duszynski" <tduszynski@marvell.com>
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> Why are we still building one .so file per DPDK library, instead of =
just
> building one big dpdk.so for all DPDK libraries?
> I think it's legacy from when DPDK libraries were versioned =
individually, and
> thus not relevant anymore.
>=20
> Wouldn't building one big dpdk.so eliminate the problems with circular
> dependencies between DPDK libraries?

Obviously, the source code should remain organized as individual =
directories per library.
I'm only suggesting linking them all into one object, so any DPDK lib =
can call any function in any other DPDK lib.

Perhaps only the core libs or always_enable libs should be linked into =
one object.

Here's an example benefit:
I'm currently trying to convince the PMU lib author to make PMU depend =
on EAL [1], so missing error handling of sysconf(_SC_PAGESIZE) can be in =
the EAL for all uses, instead of copy-pasting sysconf(_SC_PAGESIZE) =
error handling to everywhere it is used.
But this is difficult with the dependency chain for the patch adding PMU =
to Trace: Trace depends on PMU, and EAL depends on Trace, therefore EAL =
depends on PMU.

[1]: =
https://inbox.dpdk.org/dev/98CBD80474FA8B44BF855DF32C47DC35E9FD08@smartse=
rver.smartshare.dk/