netdev - RE: [PATCH 04/10] ravb: Add support for RZ/G2L SoC

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Date:   Sun, 3 Oct 2021 06:51:16 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH 04/10] ravb: Add support for RZ/G2L SoC

> Subject: Re: [PATCH 04/10] ravb: Add support for RZ/G2L SoC
> 
> On 10/1/21 6:06 PM, Biju Das wrote:
> 
> > RZ/G2L SoC has Gigabit Ethernet IP consisting of Ethernet controller
> > (E-MAC), Internal TCP/IP Offload Engine (TOE) and Dedicated Direct
> > memory access controller (DMAC).
> >
> > This patch adds compatible string for RZ/G2L and fills up the
> > ravb_hw_info struct. Function stubs are added which will be used by
> > gbeth_hw_info and will be filled incrementally.
> 
>    I've always been against this patch -- we get a support for the GbEther
> whihc doesn't work after this patch. I believe we should have the GbEther
> support in the last patch. of the overall series.


This is the common practice. We use bricks to build a wall. The function stubs are just
Bricks. 

After filling stubs, we will add SoC dt and board DT, after that one will get GBsupport on
RZ/G2L platform.

Regards,
Biju

> 
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > RFC->v1:
> >  * Added compatible string for RZ/G2L.
> >  * Added feature bits max_rx_len, aligned_tx and tx_counters for RZ/G2L.
> > ---
> >  drivers/net/ethernet/renesas/ravb.h      |  2 +
> >  drivers/net/ethernet/renesas/ravb_main.c | 62
> > ++++++++++++++++++++++++
> >  2 files changed, 64 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/renesas/ravb.h
> > b/drivers/net/ethernet/renesas/ravb.h
> > index c91e93e5590f..f6398fdcead2 100644
> > --- a/drivers/net/ethernet/renesas/ravb.h
> > +++ b/drivers/net/ethernet/renesas/ravb.h
> [...]
> > diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> > b/drivers/net/ethernet/renesas/ravb_main.c
> > index 8bf13586e90a..dc817b4d95a1 100644
> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> [...]
> > @@ -2073,12 +2120,27 @@ static const struct ravb_hw_info
> ravb_gen2_hw_info = {
> >  	.nc_queue = 1,
> >  };
> >
> > +static const struct ravb_hw_info gbeth_hw_info = {
> > +	.rx_ring_free = ravb_rx_ring_free_gbeth,
> > +	.rx_ring_format = ravb_rx_ring_format_gbeth,
> > +	.alloc_rx_desc = ravb_alloc_rx_desc_gbeth,
> > +	.receive = ravb_rx_gbeth,
> > +	.set_rate = ravb_set_rate_gbeth,
> > +	.set_feature = ravb_set_features_gbeth,
> > +	.dmac_init = ravb_dmac_init_gbeth,
> > +	.emac_init = ravb_emac_init_gbeth,
> > +	.max_rx_len = GBETH_RX_BUFF_MAX + RAVB_ALIGN - 1,
> 
>    ALIGN(GBETH_RX_BUFF_MAX, RAVB_ALIGN)?
> 
> > +	.aligned_tx = 1,
> > +	.tx_counters = 1,
> > +};
> > +
> 
> [...]
> 
> MBR. Sergey