linux-kernel - Re: [PATCH -next] net: mlx5: Kconfig: Fix MLX5_CORE

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Date:   Tue, 27 Aug 2019 21:15:23 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "wharms@....de" <wharms@....de>,
        "maowenan@...wei.com" <maowenan@...wei.com>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] net: mlx5: Kconfig: Fix MLX5_CORE_EN dependencies

On Tue, 2019-08-27 at 17:51 +0800, maowenan wrote:
> 
> On 2019/8/27 15:24, walter harms wrote:
> > 
> > Am 27.08.2019 05:12, schrieb Mao Wenan:
> > > When MLX5_CORE_EN=y and PCI_HYPERV_INTERFACE is not set, below
> > > errors are found:
> > > drivers/net/ethernet/mellanox/mlx5/core/en_main.o: In function
> > > `mlx5e_nic_enable':
> > > en_main.c:(.text+0xb649): undefined reference to
> > > `mlx5e_hv_vhca_stats_create'
> > > drivers/net/ethernet/mellanox/mlx5/core/en_main.o: In function
> > > `mlx5e_nic_disable':
> > > en_main.c:(.text+0xb8c4): undefined reference to
> > > `mlx5e_hv_vhca_stats_destroy'
> > > 
> > > This because CONFIG_PCI_HYPERV_INTERFACE is newly introduced by
> > > 'commit 348dd93e40c1
> > > ("PCI: hv: Add a Hyper-V PCI interface driver for software
> > > backchannel interface"),
> > > Fix this by making MLX5_CORE_EN imply PCI_HYPERV_INTERFACE.
> > > 
> > > Fixes: cef35af34d6d ("net/mlx5e: Add mlx5e HV VHCA stats agent")
> > > Signed-off-by: Mao Wenan <maowenan@...wei.com>
> > > ---
> > >  drivers/net/ethernet/mellanox/mlx5/core/Kconfig | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > > b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > > index 37fef8c..a6a70ce 100644
> > > --- a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > > +++ b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > > @@ -35,6 +35,7 @@ config MLX5_CORE_EN
> > >  	depends on IPV6=y || IPV6=n || MLX5_CORE=m
> > 
> > OT but ...
> > is that IPV6 needed at all ? can there be something else that yes
> > or no ?

only needed for en_rep.c/en_tc.c which are only compiled when
MLX5_ESWITCH is selected, so actually such condition should be for
MLX5_ESWITCH and not MLX5_CORE_EN

tested with:
MLX5_CORE=y
MLX5_CORE_EN=y
IPV6=m

and removed the dependency.
so if ipv6 is a module but mlx5 is builtin this will happen.. 

ld: drivers/net/ethernet/mellanox/mlx5/core/en_rep.o: in function
`mlx5e_rep_neigh_update_init_interval':
/home/saeedm/devel/linux/drivers/net/ethernet/mellanox/mlx5/core/en_rep
.c:505: undefined reference to `nd_tbl'
ld: drivers/net/ethernet/mellanox/mlx5/core/en_rep.o: in function
`mlx5e_rep_netevent_event':
/home/saeedm/devel/linux/drivers/net/ethernet/mellanox/mlx5/core/en_rep
.c:946: undefined reference to `nd_tbl'
ld:
/home/saeedm/devel/linux/drivers/net/ethernet/mellanox/mlx5/core/en_rep
.c:919: undefined reference to `nd_tbl'
ld: drivers/net/ethernet/mellanox/mlx5/core/en_tc.o: in function
`mlx5e_tc_update_neigh_used_value':
/home/saeedm/devel/linux/drivers/net/ethernet/mellanox/mlx5/core/en_tc.
c:1497: undefined reference to `nd_tbl'

the problem is that mlx5_core can't be builtin if ipv6 is a module due
to this nd_tbl dependency 

I think this is solvable by using ipv6_stub->nd_tbl, instead of
referencing md_tbl directly from mlx5.

> 
> If I set IPV6=m, errors are found as below:
> drivers/net/ethernet/mellanox/mlx5/core/main.o: In function
> `mlx5_unload':
> main.c:(.text+0x275): undefined reference to `mlx5_hv_vhca_cleanup'
> drivers/net/ethernet/mellanox/mlx5/core/main.o: In function
> `mlx5_cleanup_once':
> main.c:(.text+0x2e8): undefined reference to `mlx5_hv_vhca_destroy'
> drivers/net/ethernet/mellanox/mlx5/core/main.o: In function
> `mlx5_load_one':
> main.c:(.text+0x23c1): undefined reference to `mlx5_hv_vhca_create'
> main.c:(.text+0x248f): undefined reference to `mlx5_hv_vhca_init'
> main.c:(.text+0x25e0): undefined reference to `mlx5_hv_vhca_cleanup

this is not related, i think there is something wrong with your local
repository.