netdev - RE: [net-next v5 09/15] net/mlx5: E-switch, Prepare eswitch to handle SF vport

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Date:   Wed, 16 Dec 2020 05:28:02 +0000
From:   Parav Pandit <parav@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>, Saeed Mahameed <saeed@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jason Gunthorpe <jgg@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        David Ahern <dsahern@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        "david.m.ertman@...el.com" <david.m.ertman@...el.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "kiran.patil@...el.com" <kiran.patil@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Vu Pham <vuhuong@...dia.com>, Roi Dayan <roid@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: RE: [net-next v5 09/15] net/mlx5: E-switch, Prepare eswitch to handle
 SF vport



> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Wednesday, December 16, 2020 6:18 AM
> 
> On Tue, 15 Dec 2020 01:03:52 -0800 Saeed Mahameed wrote:
> > From: Vu Pham <vuhuong@...dia.com>
> >
> > Prepare eswitch to handle SF vport during
> > (a) querying eswitch functions
> > (b) egress ACL creation
> > (c) account for SF vports in total vports calculation
> >
> > Assign a dedicated placeholder for SFs vports and their representors.
> > They are placed after VFs vports and before ECPF vports as below:
> > [PF,VF0,...,VFn,SF0,...SFm,ECPF,UPLINK].
> >
> > Change functions to map SF's vport numbers to indices when accessing
> > the vports or representors arrays, and vice versa.
> >
> > Signed-off-by: Vu Pham <vuhuong@...dia.com>
> > Signed-off-by: Parav Pandit <parav@...dia.com>
> > Reviewed-by: Roi Dayan <roid@...dia.com>
> > Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
> 
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > index d6c48582e7a8..ad45d20f9d44 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
> > @@ -212,3 +212,13 @@ config MLX5_SF
> >  	Build support for subfuction device in the NIC. A Mellanox
> subfunction
> >  	device can support RDMA, netdevice and vdpa device.
> >  	It is similar to a SRIOV VF but it doesn't require SRIOV support.
> > +
> > +config MLX5_SF_MANAGER
> > +	bool
> > +	depends on MLX5_SF && MLX5_ESWITCH
> > +	default y
> > +	help
> > +	Build support for subfuction port in the NIC. A Mellanox subfunction
> > +	port is managed through devlink.  A subfunction supports RDMA,
> netdevice
> > +	and vdpa device. It is similar to a SRIOV VF but it doesn't require
> > +	SRIOV support.
> 
> Why is this a separate knob?
> 
> And it's not used anywhere AFAICS.
SF device and SF manager are two different sides. SF manager is only supported when eswitch is enabled.
It is used in subsequent of sf/devlink.c to disable port add/del callbacks.
I should possibly move this hunk to devlink patch 11.