Re: [PATCH net-next v8 0/4] net: Add Keystone NetCP ethernet driver support

[Murali Karicheri]

+ Felipe, Mugunthan for commenting on TI_CPSW, ALE.

On 01/28/2015 04:03 PM, Arnd Bergmann wrote:
> On Wednesday 28 January 2015 15:43:57 Murali Karicheri wrote:
> > > this. Hope I am on the right track.
> >
> > Reproduced this. Following errors seen when building the modules.
> >
> >     LD [M]  drivers/net/ethernet/ti/keystone_netcp.o
> > drivers/net/ethernet/ti/netcp_ethss.o: In function `init_module':
> > netcp_ethss.c:(.init.text+0x0): multiple definition of `init_module'
> > drivers/net/ethernet/ti/netcp_core.o:netcp_core.c:(.init.text+0x0):
> > first defined here
> > drivers/net/ethernet/ti/netcp_ethss.o: In function `cleanup_module':
> > netcp_ethss.c:(.exit.text+0x0): multiple definition of `cleanup_module'
> > drivers/net/ethernet/ti/netcp_core.o:netcp_core.c:(.exit.text+0x0):
> > first defined here
> > make[4]: *** [drivers/net/ethernet/ti/keystone_netcp.o] Error 1
> >
> > BTW, I had to disable cpsw_ale.c to get to build keystone NetCP. I am
> > assuming someone from TI is addressing this.
> >
> > drivers/net/ethernet/ti/cpsw_ale.c: In function âcpsw_ale_startâ:
> > drivers/net/ethernet/ti/cpsw_ale.c:759:2: error: âKBUILD_MODNAMEâ
> > undeclared (first use in this function)
> > drivers/net/ethernet/ti/cpsw_ale.c:759:2: note: each undeclared
> > identifier is reported only once for each function it appears in
>
> I think both problems are nontrivial to fix. The first one is obviously
> that there are multiple init_module functions in one module. You have
> to either split the driver into multiple loadable modules with at most
> one init_module/cleanup_module pair each, or call one of the functions
> from the other one in the right order.
I have a version that is building now with out issues. I had to make 
several modifications.

1. export functions from drivers/soc/ti/knav* that are used by the netcp 
driver. I will be sending a patch for this soon.

2. Convert netcp_ethss.o to a module and add Kconfig for the same

 config TI_KEYSTONE_NETCP
-       tristate "TI Keystone NETCP Ethernet subsystem Support"
+       tristate "TI Keystone NETCP Core Support"
+       select TI_CPSW_ALE
        depends on OF
        depends on KEYSTONE_NAVIGATOR_DMA && KEYSTONE_NAVIGATOR_QMSS
        ---help---
-         This driver supports TI's Keystone NETCP Ethernet subsystem.
+         This driver supports TI's Keystone NETCP Core.
+
+         To compile this driver as a module, choose M here: the module
+         will be called keystone_netcp.
+
+config TI_KEYSTONE_NETCP_ETHSS
+       depends on TI_KEYSTONE_NETCP
+       tristate "TI Keystone NETCP Ethernet subsystem Support"
+       ---help---


And Makefile to change as

diff --git a/drivers/net/ethernet/ti/Makefile 
b/drivers/net/ethernet/ti/Makefile
index 0a9813b..1dbb8b5 100644
--- a/drivers/net/ethernet/ti/Makefile
+++ b/drivers/net/ethernet/ti/Makefile
@@ -8,9 +8,13 @@ obj-$(CONFIG_TI_DAVINCI_EMAC) += davinci_emac.o
 obj-$(CONFIG_TI_DAVINCI_MDIO) += davinci_mdio.o
 obj-$(CONFIG_TI_DAVINCI_CPDMA) += davinci_cpdma.o
 obj-$(CONFIG_TI_CPSW_PHY_SEL) += cpsw-phy-sel.o
 obj-$(CONFIG_TI_CPSW) += ti_cpsw.o
 ti_cpsw-y := cpsw_ale.o cpsw.o cpts.o

 obj-$(CONFIG_TI_KEYSTONE_NETCP) += keystone_netcp.o
-keystone_netcp-y := netcp_core.o netcp_ethss.o netcp_sgmii.o \
-                       netcp_xgbepcsr.o cpsw_ale.o
+keystone_netcp-y := netcp_core.o
+
+obj-$(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

3. export some of the functions in netcp_core.c to support building 
keystone_netcp_ethss as module.

> The second problem is where I got stuck myself: cpsw_ale.c (also cpts.c)
> is getting linked into both modules, which is not allowed: It is
> impossible for the kernel to compile these if one driver is a module
> and the other one is not, and any use of KBUILD_MODNAME fails because
> it is unclear what the modname is if the file is compiled once to
> be linked into two drivers.

I am still looking into this. Both Keystone and TI CPSW driver would 
need to use cpsw_ale.o and cpts.o (currently not used, but will need 
this later). Not found a solution yet.

Murali
> 	Arnd


--
Murali Karicheri
Linux Kernel, Texas Instruments
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