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From: Sergey Shtylyov <s.shtylyov@omp.ru>
To: Biju Das <biju.das.jz@bp.renesas.com>,
	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 13:11:44 +0300	[thread overview]
Message-ID: <dcbf2171-080c-d743-6aeb-6936b498d1fd@omp.ru> (raw)
In-Reply-To: <OS0PR01MB59225D98CEA7E2E0FD959B3186FF9@OS0PR01MB5922.jpnprd01.prod.outlook.com>

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.
> 
> Regards,
> Biju

MBR, Sergey

  reply	other threads:[~2021-08-18 10:11 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 [this message]
2021-08-18 10:23                   ` Biju Das
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

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