linux-kernel - Re: [RFC PATCH] net: macb: Apply RXUBR workaround only to versions with errata

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Message-ID: <88ca959b-6fed-8afb-e433-6a21e17ec067@microchip.com>
Date:   Thu, 29 Nov 2018 10:00:22 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <brandon.streiff@...com>, <harini.katakam@...inx.com>,
        <Nicolas.Ferre@...rochip.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <michal.simek@...inx.com>, <harinikatakamlinux@...il.com>
Subject: Re: [RFC PATCH] net: macb: Apply RXUBR workaround only to versions
 with errata



On 28.11.2018 23:09, Brandon Streiff wrote:
> On 11/23/2018 3:59 AM, Harini Katakam wrote:
>> +/* Errata mask bits */
>> +#define MACB_ERRATA_RXLOCKUP			0x00000001
>> +
>>  /* LSO settings */
>>  #define MACB_LSO_UFO_ENABLE			0x01
>>  #define MACB_LSO_TSO_ENABLE			0x02
>> @@ -1085,6 +1088,7 @@ struct macb_config {
>>  			    struct clk **rx_clk);
>>  	int	(*init)(struct platform_device *pdev);
>>  	int	jumbo_max_len;
>> +	u32	errata;
>>  };
>>  
>>  struct tsu_incr {
>> @@ -1214,6 +1218,8 @@ struct macb {
>>  
>>  	int	rx_bd_rd_prefetch;
>>  	int	tx_bd_rd_prefetch;
>> +
>> +	u32 errata;
>>  };
> 
> Hi Harini,
> 
> Could this be made into simpler by instead adding a caps bit, named
> (perhaps) MACB_CAPS_BUGGY_RXUBR or MACB_CAPS_NEEDS_RXUBR_RESETS or
> something?
> 
> That would save needing to add a new u32 field into the macb_config and
> macb structs (both of which already have this caps field).
> 

I avoid duplicating these fields from struct macb_config to struct macb I
would start to move macb_config part of struct macb as a const * member
(see [1]).


[1]
https://github.com/linux4sam/linux-at91/commit/8c588136189148d79c4078c55da2242a2ba2b8d3#diff-921c839dba439fd502a24aed0845dc9d