From: subashab@codeaurora.org
To: Alex Elder <elder@ieee.org>
Cc: Jakub Kicinski <kuba@kernel.org>,
Sharath Chandra Vurukala <sharathv@codeaurora.org>,
davem@davemloft.net, elder@kernel.org, cpratapa@codeaurora.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] net:ethernet:rmnet:Support for downlink MAPv5 csum offload
Date: Fri, 12 Feb 2021 13:11:26 -0700 [thread overview]
Message-ID: <f950b355214bd78f80df24391b85c4cc@codeaurora.org> (raw)
In-Reply-To: <dfa87271-0ade-f8b5-b41f-1128353b3248@ieee.org>
On 2021-02-12 12:06, Alex Elder wrote:
> On 2/12/21 12:51 PM, Jakub Kicinski wrote:
>> On Fri, 12 Feb 2021 08:01:15 -0600 Alex Elder wrote:
>>> On 2/11/21 8:04 PM, Jakub Kicinski wrote:
>>>> On Fri, 12 Feb 2021 03:05:23 +0530 Sharath Chandra Vurukala wrote:
>>>>> +/* MAP CSUM headers */
>>>>> +struct rmnet_map_v5_csum_header {
>>>>> + u8 next_hdr:1;
>>>>> + u8 header_type:7;
>>>>> + u8 hw_reserved:5;
>>>>> + u8 priority:1;
>>>>> + u8 hw_reserved_bit:1;
>>>>> + u8 csum_valid_required:1;
>>>>> + __be16 reserved;
>>>>> +} __aligned(1);
>>>>
>>>> Will this work on big endian?
>>>
>>> Sort of related to this point...
>>>
>>> I'm sure the response to this will be to add two versions
>>> of the definition, surrounded __LITTLE_ENDIAN_BITFIELD
>>> and __BIG_ENDIAN_BITFIELD tests.
>>>
>>> I really find this non-intuitive, and every time I
>>> look at it I have to think about it a bit to figure
>>> out where the bits actually lie in the word.
>>>
>>> I know this pattern is used elsewhere in the networking
>>> code, but that doesn't make it any easier for me to
>>> understand...
>>>
>>> Can we used mask, defined in host byte order, to
>>> specify the positions of these fields?
>>>
>>> I proposed a change at one time that did this and
>>> this *_ENDIAN_BITFIELD thing was used instead.
>>>
>>> I will gladly implement this change (completely
>>> separate from what's being done here), but thought
>>> it might be best to see what people think about it
>>> before doing that work.
>>
>> Most definitely agree, please convert.
>
> KS, would you like me to do this to the existing code
> first?
>
> I don't think it will take me very long. If it were
> a priority I could probably get it done by the end of
> today, but I'd want to ensure the result worked for
> the testing you do.
>
> -Alex
Sorry, I am not convinced that it is helping
to improve anything. It just adds a big
overhead of testing everything again without any
apparent improvement of performance or readablity
of code.
next prev parent reply other threads:[~2021-02-12 20:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 21:35 [PATCH 0/3]net:qualcomm:rmnet:Enable Mapv5 Sharath Chandra Vurukala
2021-02-11 21:35 ` [PATCH 1/3] docs:networking: Add documentation for MAP v5 Sharath Chandra Vurukala
2021-02-11 21:35 ` [PATCH 2/3] net:ethernet:rmnet:Support for downlink MAPv5 csum offload Sharath Chandra Vurukala
2021-02-12 2:04 ` Jakub Kicinski
2021-02-12 14:01 ` Alex Elder
2021-02-12 17:49 ` subashab
2021-02-12 18:51 ` Jakub Kicinski
2021-02-12 19:06 ` Alex Elder
2021-02-12 20:11 ` subashab [this message]
2021-02-12 4:53 ` kernel test robot
2021-02-11 21:35 ` [PATCH 3/3] net:ethernet:rmnet: Add support for Mapv5 Uplink packet Sharath Chandra Vurukala
2021-02-12 2:25 ` kernel test robot
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