From: Murali Karicheri <m-karicheri2@ti•com>
To: Arnd Bergmann <arnd@arndb•de>
Cc: <linux-kernel@vger•kernel.org>, <netdev@vger•kernel.org>,
<davem@davemloft•net>
Subject: Re: [PATCH v2 3/3] net: netcp: rework the code for get/set sw_data in dma desc
Date: Mon, 22 Feb 2016 12:04:08 -0500 [thread overview]
Message-ID: <56CB3F88.2050104@ti.com> (raw)
In-Reply-To: <4850949.nFTN7kbEd4@wuerfel>
On 02/19/2016 05:25 PM, Arnd Bergmann wrote:
> On Friday 19 February 2016 17:21:57 Murali Karicheri wrote:
>>>> get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
>>>> - get_sw_data((u32 *)&buf_ptr, &buf_len, ndesc);
>>>> + /* warning!!!! We are retrieving the virtual ptr in the sw_data
>>>> + * field as a 32bit value. Will not work on 64bit machines
>>>> + */
>>>> + buf_ptr = (void *)GET_SW_DATA0(ndesc);
>>>> + buf_len = (int)GET_SW_DATA1(desc);
>>>
>>> I would have abstracted the retrieval of a pointer again,
>>> and added the comment in the helper function once, it doesn't
>>> really need to be duplicated everywhere.
>>>
>> Arnd,
>>
>> I thought about it to add it to the API. API currently set buffer
>> and ptr. It would be an issue only if store/retrieve ptr in/from the sw_data.
>> So for the comment to be really useful to someone who is changing the code,
>> doesn't it make sense to add it at the point of invocation as done in this
>> patch? No?
>>
>
> Up to you, it was just an idea and you have my Ack either way.
>
> Arnd
>
Ok. Thanks
--
Murali Karicheri
Linux Kernel, Keystone
next prev parent reply other threads:[~2016-02-22 17:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-19 17:58 [PATCH v2 0/3] net: ti: netcp: restore get/set_pad_info() functionality Murali Karicheri
2016-02-19 17:58 ` [PATCH v2 1/3] " Murali Karicheri
2016-02-19 20:56 ` Arnd Bergmann
2016-02-19 17:58 ` [PATCH v2 2/3] soc: ti: knav_dma: rename pad in struct knav_dma_desc to sw_data Murali Karicheri
2016-02-19 20:55 ` Arnd Bergmann
2016-02-19 17:58 ` [PATCH v2 3/3] net: netcp: rework the code for get/set sw_data in dma desc Murali Karicheri
2016-02-19 20:55 ` Arnd Bergmann
2016-02-19 22:21 ` Murali Karicheri
2016-02-19 22:25 ` Arnd Bergmann
2016-02-22 17:04 ` Murali Karicheri [this message]
2016-02-22 3:02 ` [PATCH v2 0/3] net: ti: netcp: restore get/set_pad_info() functionality David Miller
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