Netdev Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Biju Das <biju.das.jz@bp.renesas.com>
To: Sergey Shtylyov <s.shtylyov@omp.ru>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Sergey Shtylyov <s.shtylyov@omprussia.ru>
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@gmail.com>,
	Adam Ford <aford173@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
	Yuusuke Ashizuka <ashiduka@fujitsu.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	netdev <netdev@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: RE: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to driver data
Date: Wed, 18 Aug 2021 10:23:40 +0000	[thread overview]
Message-ID: <OS0PR01MB59228540B0F69FA3FE13501886FF9@OS0PR01MB5922.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <dcbf2171-080c-d743-6aeb-6936b498d1fd@omp.ru>

Hi Sergei,

> -----Original Message-----
> Subject: Re: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to
> driver data
> 
> Hello!
> 
> On 18.08.2021 9:29, Biju Das wrote:
> 
> [...]
> >>>>>>> -----Original Message-----
> >>>>>>> On Mon, Aug 2, 2021 at 12:27 PM Biju Das
> >>>>>>> <biju.das.jz@bp.renesas.com>
> >>>>>>> wrote:
> >>>>>>>> The DMAC and EMAC blocks of Gigabit Ethernet IP found on RZ/G2L
> >>>>>>>> SoC are similar to the R-Car Ethernet AVB IP. With a few
> >>>>>>>> changes in the driver we can support both IPs.
> >>>>>>>>
> >>>>>>>> Currently a runtime decision based on the chip type is used to
> >>>>>>>> distinguish the HW differences between the SoC families.
> >>>>>>>>
> >>>>>>>> The number of TX descriptors for R-Car Gen3 is 1 whereas on
> >>>>>>>> R-Car
> >>>>>>>> Gen2 and RZ/G2L it is 2. For cases like this it is better to
> >>>>>>>> select the number of TX descriptors by using a structure with a
> >>>>>>>> value, rather than a runtime decision based on the chip type.
> >>>>>>>>
> >>>>>>>> This patch adds the num_tx_desc variable to struct ravb_hw_info
> >>>>>>>> and also replaces the driver data chip type with struct
> >>>>>>>> ravb_hw_info by moving chip type to it.
> >>>>>>>>
> >>>>>>>> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> >>>>>>>> Reviewed-by: Lad Prabhakar
> >>>>>>>> <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >>>>>>>
> >>>>>>> Thanks for your patch!
> >>>>>>>
> >>>>>>>> --- a/drivers/net/ethernet/renesas/ravb.h
> >>>>>>>> +++ b/drivers/net/ethernet/renesas/ravb.h
> >>>>>>>> @@ -988,6 +988,11 @@ enum ravb_chip_id {
> >>>>>>>>          RCAR_GEN3,
> >>>>>>>>   };
> >>>>>>>>
> >>>>>>>> +struct ravb_hw_info {
> >>>>>>>> +       enum ravb_chip_id chip_id;
> >>>>>>>> +       int num_tx_desc;
> >>>>>>>
> >>>>>>> Why not "unsigned int"? ...
> >>>>>>> This comment applies to a few more subsequent patches.
> >>>>>>
> >>>>>> To avoid signed and unsigned comparison warnings.
> >>>>>>
> >>>>>>>
> >>>>>>>> +};
> >>>>>>>> +
> >>>>>>>>   struct ravb_private {
> >>>>>>>>          struct net_device *ndev;
> >>>>>>>>          struct platform_device *pdev; @@ -1040,6 +1045,8 @@
> >>>>>>>> struct ravb_private {
> >>>>>>>>          unsigned txcidm:1;              /* TX Clock Internal
> Delay
> >>>>> Mode
> >>>>>>> */
> >>>>>>>>          unsigned rgmii_override:1;      /* Deprecated rgmii-*id
> >>>>> behavior
> >>>>>>> */
> >>>>>>>>          int num_tx_desc;                /* TX descriptors per
> >>>> packet
> >>>>> */
> >>>>>>>
> >>>>>>> ... oh, here's the original culprit.
> >>>>>>
> >>>>>> Exactly, this the reason.
> >>>>>>
> >>>>>> Do you want me to change this into unsigned int? Please let me
> know.
> >>>>>
> >>>>> Up to you (or the maintainer? ;-)
> >>>>>
> >>>>> For new fields (in the other patches), I would use unsigned for
> >>>>> all unsigned values.  Signed values have more pitfalls related to
> >>>>> undefined behavior.
> >>>>
> >>>> Sergei, What is your thoughts here? Please let me know.
> >>>
> >>> Here is my plan.
> >>>
> >>> I will split this patch into two as Andrew suggested and
> >>
> >>     If you mran changing the ravb_private::num_tx_desc to *unsigned*,
> >> it'll be a good cleanup. What's would be the 2nd part tho?
> >
> > OK in that case, I will split this patch into 3.
> >
> > First patch for adding struct ravb_hw_info to driver data and replace
> > driver data chip type with struct ravb_hw_info
> 
>     Couldn't this be a 2nd patch?..
> 
> > Second patch for changing ravb_private::num_tx_desc from int to unsigned
> int.
> 
>     ... and this one the 1st?
> 
> > Third patch for adding aligned_tx to struct ravb_hw_info.

Sure. Will do.

Cheers,
Biju

  reply	other threads:[~2021-08-18 10:23 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 10:26 [PATCH net-next v2 0/8] Add Gigabit Ethernet driver support Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to driver data Biju Das
2021-08-02 15:02   ` Andrew Lunn
2021-08-02 20:42   ` Sergei Shtylyov
2021-08-03  5:57     ` Biju Das
2021-08-03  6:36       ` Biju Das
2021-08-04 19:27       ` Sergei Shtylyov
2021-08-04 20:27         ` Sergei Shtylyov
2021-08-09 12:06   ` Geert Uytterhoeven
2021-08-12  7:26     ` Biju Das
2021-08-12  7:58       ` Geert Uytterhoeven
2021-08-12  8:13         ` Biju Das
2021-08-17 11:24           ` Biju Das
2021-08-17 20:11             ` Sergey Shtylyov
2021-08-18  6:29               ` Biju Das
2021-08-18 10:11                 ` Sergey Shtylyov
2021-08-18 10:23                   ` Biju Das [this message]
2021-08-02 10:26 ` [PATCH net-next v2 2/8] ravb: Add skb_sz to struct ravb_hw_info Biju Das
2021-08-02 15:08   ` Andrew Lunn
2021-08-02 20:54   ` Sergei Shtylyov
2021-08-03  7:13     ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 3/8] ravb: Add num_gstat_queue " Biju Das
2021-08-02 15:09   ` Andrew Lunn
2021-08-03 18:21   ` Sergei Shtylyov
2021-08-03 19:13     ` Biju Das
2021-08-03 19:22       ` Sergei Shtylyov
2021-08-03 19:47         ` Biju Das
2021-08-17 15:08           ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 4/8] ravb: Add stats_len " Biju Das
2021-08-03 18:35   ` Sergei Shtylyov
2021-08-03 18:47     ` Biju Das
2021-08-03 19:20       ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 5/8] ravb: Add gstrings_stats and gstrings_size " Biju Das
2021-08-02 15:11   ` Andrew Lunn
2021-08-04 20:36   ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 6/8] ravb: Add net_features and net_hw_features " Biju Das
2021-08-02 15:12   ` Andrew Lunn
2021-08-05 19:07   ` Sergei Shtylyov
2021-08-05 19:18     ` Biju Das
2021-08-06 20:20       ` Sergei Shtylyov
2021-08-12  7:35         ` Biju Das
2021-08-06 20:31   ` Sergei Shtylyov
2021-08-02 10:26 ` [PATCH net-next v2 7/8] ravb: Add internal delay hw feature " Biju Das
2021-08-02 15:13   ` Andrew Lunn
2021-08-03 21:06   ` Sergei Shtylyov
2021-08-04  6:19     ` Biju Das
2021-08-03 21:12   ` Sergei Shtylyov
2021-08-04  5:13     ` Biju Das
2021-08-04  9:51       ` Sergey Shtylyov
2021-08-04 10:08         ` Biju Das
2021-08-04 10:34           ` Sergei Shtylyov
2021-08-04 10:20       ` Sergei Shtylyov
2021-08-04 10:32         ` Biju Das
2021-08-02 10:26 ` [PATCH net-next v2 8/8] ravb: Add tx_drop_cntrs " Biju Das
2021-08-02 15:14   ` Andrew Lunn
2021-08-04 20:50   ` Sergei Shtylyov
2021-08-17 15:47     ` Biju Das
2021-08-17 16:30       ` Sergey Shtylyov
2021-08-17 16:33         ` Biju Das

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=OS0PR01MB59228540B0F69FA3FE13501886FF9@OS0PR01MB5922.jpnprd01.prod.outlook.com \
    --to=biju.das.jz@bp.renesas.com \
    --cc=Chris.Paterson2@renesas.com \
    --cc=aford173@gmail.com \
    --cc=andrew@lunn.ch \
    --cc=ashiduka@fujitsu.com \
    --cc=biju.das@bp.renesas.com \
    --cc=davem@davemloft.net \
    --cc=geert@linux-m68k.org \
    --cc=kuba@kernel.org \
    --cc=linux-renesas-soc@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=prabhakar.mahadev-lad.rj@bp.renesas.com \
    --cc=s.shtylyov@omp.ru \
    --cc=s.shtylyov@omprussia.ru \
    --cc=sergei.shtylyov@gmail.com \
    --cc=yoshihiro.shimoda.uh@renesas.com \
    --subject='RE: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to driver data' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).