netdev - RE: [PATCH 03/10] ravb: Add nc_queue to struct ravb_hw

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Date:   Wed, 6 Oct 2021 20:12:22 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     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 03/10] ravb: Add nc_queue to struct ravb_hw_info

Hi Sergey,

> -----Original Message-----
> From: Sergei Shtylyov <sergei.shtylyov@...il.com>
> Sent: 06 October 2021 20:46
> To: Biju Das <biju.das.jz@...renesas.com>; Sergey Shtylyov
> <s.shtylyov@....ru>; David S. Miller <davem@...emloft.net>; Jakub Kicinski
> <kuba@...nel.org>
> Cc: 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; 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 03/10] ravb: Add nc_queue to struct ravb_hw_info
> 
> On 10/3/21 9:58 AM, Biju Das wrote:
> 
> >>> R-Car supports network control queue whereas RZ/G2L does not support
> >>> it. Add nc_queue to struct ravb_hw_info, so that NC queue is handled
> >>> only by R-Car.
> >>>
> >>> This patch also renames ravb_rcar_dmac_init to ravb_dmac_init_rcar
> >>> to be consistent with the naming convention used in sh_eth driver.
> >>>
> >>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> >>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >>
> >> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> >>
> >>    One little nit below:
> >>
> >>> ---
> >>> RFC->v1:
> >>>  * Handled NC queue only for R-Car.
> >>> ---
> >>>  drivers/net/ethernet/renesas/ravb.h      |   3 +-
> >>>  drivers/net/ethernet/renesas/ravb_main.c | 140
> >>> +++++++++++++++--------
> >>>  2 files changed, 94 insertions(+), 49 deletions(-)
> >>>
> >>> diff --git a/drivers/net/ethernet/renesas/ravb.h
> >>> b/drivers/net/ethernet/renesas/ravb.h
> >>> index a33fbcb4aac3..c91e93e5590f 100644
> >>> --- a/drivers/net/ethernet/renesas/ravb.h
> >>> +++ b/drivers/net/ethernet/renesas/ravb.h
> >>> @@ -986,7 +986,7 @@ struct ravb_hw_info {
> >>>  	bool (*receive)(struct net_device *ndev, int *quota, int q);
> >>>  	void (*set_rate)(struct net_device *ndev);
> >>>  	int (*set_feature)(struct net_device *ndev, netdev_features_t
> >> features);
> >>> -	void (*dmac_init)(struct net_device *ndev);
> >>> +	int (*dmac_init)(struct net_device *ndev);
> >>>  	void (*emac_init)(struct net_device *ndev);
> >>>  	const char (*gstrings_stats)[ETH_GSTRING_LEN];
> >>>  	size_t gstrings_size;
> >>> @@ -1002,6 +1002,7 @@ struct ravb_hw_info {
> >>>  	unsigned multi_irqs:1;		/* AVB-DMAC and E-MAC has multiple
> >> irqs */
> >>>  	unsigned gptp:1;		/* AVB-DMAC has gPTP support */
> >>>  	unsigned ccc_gac:1;		/* AVB-DMAC has gPTP support active in
> >> config mode */
> >>> +	unsigned nc_queue:1;		/* AVB-DMAC has NC queue */
> >>
> >>    Rather "queues" as there are RX and TX NC queues, no?
> >
> > It has NC queue on both RX and TX.
> >
> > If needed, I can send a follow up patch as RFC with the following
> changes.
> >
> > unsigned nc_queue:1;		/* AVB-DMAC has NC queue on both RX and TX
> */
> >
> > or
> >
> > unsigned nc_queues:1;		/* AVB-DMAC has RX and TX NC queues */
> >
> > please let me know.
> 
>    Yes, please do it.

OK I will go with below, as RX has single NC queue and TX has single NC queue.

unsigned nc_queue:1;		/* AVB-DMAC has NC queue on both RX and TX */

Cheers,
Biju

> 
> > Regards,
> > Biju
> 
> MNR, Sergey