linux-kernel - Re: [PATCH 3/3] net: ethernet: ti-cpsw: fix linking built-in code to modules

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Date:   Mon, 12 Jun 2023 17:27:14 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        linux-omap@...r.kernel.org, Vignesh Raghavendra <vigneshr@...com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Mao Wenan <maowenan@...wei.com>, Andrew Lunn <andrew@...n.ch>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Simon Horman <simon.horman@...igine.com>,
        Vladimir Oltean <vladimir.oltean@....com>, bpf@...r.kernel.org
Subject: Re: [PATCH 3/3] net: ethernet: ti-cpsw: fix linking built-in code to
 modules

Hi Arnd,

On 12/06/2023 15:40, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> There are six variants of the cpsw driver, sharing various parts of
> the code: davinci-emac, cpsw, cpsw-switchdev, netcp, netcp_ethss and
> am65-cpsw-nuss.
> 
> I noticed that this means some files can be linked into more than
> one loadable module, or even part of vmlinux but also linked into
> a loadable module, both of which mess up assumptions of the build
> system.
> 
> Change this back to having separate modules for each portion that
> can be linked standalone, exporting symbols as needed:
> 
>  - ti-cpsw-common.ko now contains both cpsw-common.o and
>    davinci_cpdma.o as they are always used together
> 
>  - ti-cpsw-priv.ko contains cpsw_priv.o, cpsw_sl.o and cpsw_ethtool.o,
>    which are the core of the cpsw and cpsw-new drivers.
> 
>  - ti-cpsw-ale.o is the one standalone module that is used by all
>    except davinci_emac.
> 
> Each of these will be built-in if any of its users are built-in,
> otherwise it's a loadable module if there is at least one module
> using it. I did not bring back the separate Kconfig symbols for
> this, but just handle it using Makefile logic.
> 
> Note: ideally this is something that Kbuild complains about, but
> usually we just notice when something using THIS_MODULS misbehaves
> in a way that a user notices.
> 
> Fixes: 99f6297182729 ("net: ethernet: ti: cpsw: drop TI_DAVINCI_CPDMA config option")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/ethernet/ti/Makefile        | 29 +++++++++++-----------
>  drivers/net/ethernet/ti/cpsw_ale.c      | 23 +++++++++++++++++
>  drivers/net/ethernet/ti/cpsw_ethtool.c  | 25 +++++++++++++++++++
>  drivers/net/ethernet/ti/cpsw_priv.c     | 33 +++++++++++++++++++++++++
>  drivers/net/ethernet/ti/cpsw_sl.c       |  8 ++++++
>  drivers/net/ethernet/ti/davinci_cpdma.c | 27 ++++++++++++++++++++
>  6 files changed, 130 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
> index 75f761efbea71..d1f44f7667a96 100644
> --- a/drivers/net/ethernet/ti/Makefile
> +++ b/drivers/net/ethernet/ti/Makefile
> @@ -3,28 +3,27 @@
>  # Makefile for the TI network device drivers.
>  #
>  
> -obj-$(CONFIG_TI_CPSW) += cpsw-common.o
> -obj-$(CONFIG_TI_DAVINCI_EMAC) += cpsw-common.o
> -obj-$(CONFIG_TI_CPSW_SWITCHDEV) += cpsw-common.o
> +ti-cpsw-common-y += cpsw-common.o davinci_cpdma.o
> +ti-cpsw-priv-y += cpsw_priv.o cpsw_sl.o cpsw_ethtool.o
> +ti-cpsw-ale-y += cpsw_ale.o
>  
>  obj-$(CONFIG_TLAN) += tlan.o
>  obj-$(CONFIG_CPMAC) += cpmac.o
> -obj-$(CONFIG_TI_DAVINCI_EMAC) += ti_davinci_emac.o
> -ti_davinci_emac-y := davinci_emac.o davinci_cpdma.o
> +obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o ti-cpsw-common.o
>  obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o
>  obj-$(CONFIG_TI_CPSW_PHY_SEL) += cpsw-phy-sel.o
>  obj-$(CONFIG_TI_CPTS) += cpts.o
> -obj-$(CONFIG_TI_CPSW) += ti_cpsw.o
> -ti_cpsw-y := cpsw.o davinci_cpdma.o cpsw_ale.o cpsw_priv.o cpsw_sl.o cpsw_ethtool.o
> -obj-$(CONFIG_TI_CPSW_SWITCHDEV) += ti_cpsw_new.o
> -ti_cpsw_new-y := cpsw_switchdev.o cpsw_new.o davinci_cpdma.o cpsw_ale.o cpsw_sl.o cpsw_priv.o cpsw_ethtool.o
> +obj-$(CONFIG_TI_CPSW) += ti_cpsw.o ti-cpsw-common.o ti-cpsw-priv.o ti-cpsw-ale.o
> +ti_cpsw-y := cpsw.o
> +obj-$(CONFIG_TI_CPSW_SWITCHDEV) += ti_cpsw_new.o ti-cpsw-common.o ti-cpsw-priv.o ti-cpsw-ale.o
> +ti_cpsw_new-y := cpsw_switchdev.o cpsw_new.o
>  
> -obj-$(CONFIG_TI_KEYSTONE_NETCP) += keystone_netcp.o
> -keystone_netcp-y := netcp_core.o cpsw_ale.o
> -obj-$(CONFIG_TI_KEYSTONE_NETCP_ETHSS) += keystone_netcp_ethss.o
> -keystone_netcp_ethss-y := netcp_ethss.o netcp_sgmii.o netcp_xgbepcsr.o cpsw_ale.o
> +obj-$(CONFIG_TI_KEYSTONE_NETCP) += keystone_netcp.o ti-cpsw-ale.o
> +keystone_netcp-y := netcp_core.o
> +obj-$(CONFIG_TI_KEYSTONE_NETCP_ETHSS) += keystone_netcp_ethss.o ti-cpsw-ale.o
> +keystone_netcp_ethss-y := netcp_ethss.o netcp_sgmii.o netcp_xgbepcsr.o
>  
> -obj-$(CONFIG_TI_K3_AM65_CPSW_NUSS) += ti-am65-cpsw-nuss.o
> -ti-am65-cpsw-nuss-y := am65-cpsw-nuss.o cpsw_sl.o am65-cpsw-ethtool.o cpsw_ale.o k3-cppi-desc-pool.o am65-cpsw-qos.o
> +obj-$(CONFIG_TI_K3_AM65_CPSW_NUSS) += ti-am65-cpsw-nuss.o ti-cpsw-priv.o ti-cpsw-ale.o

cpsw_priv.o and cpsw_ethtool.o (included in ti-cpsw-priv.o) are not required by ti-am65-cpsw-nuss.
It only needs cpsw_sl.o

-- 
cheers,
-roger