netdev - Re: [RFC PATCH] net, gro: fix the truesize of all fragments

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Message-ID: <52B45256.3010602@cogentembedded.com>
Date:	Fri, 20 Dec 2013 18:21:10 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH] net, gro: fix the truesize of all fragments

Hello.

On 20-12-2013 17:59, Zhi Yong Wu wrote:

>>> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>

>>> When the truesize of all fragments was calculated, it didn't take
>>> the first small piece of data into account.

>>> Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
>>> ---
>>>    net/core/skbuff.c |   10 +++++++---
>>>    1 files changed, 7 insertions(+), 3 deletions(-)

>>> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
>>> index 2b6b863..0665bd6 100644
>>> --- a/net/core/skbuff.c
>>> +++ b/net/core/skbuff.c
>>> @@ -3027,9 +3027,12 @@ int skb_gro_receive(struct sk_buff **head, struct
>>> sk_buff *skb)
>>>                  frag->page_offset += offset;
>>>                  skb_frag_size_sub(frag, offset);
>>>
>>> -               /* all fragments truesize : remove (head size + sk_buff)
>>> */
>>> +               /**

>>     Why kernel-doc style comment here? Networking code uses the following
>> comment style:

>> /* bla
>>   * bla
>>   */

> No, If you check other comments in networking code,

    I suggest you do this, and not only comments before functions but also 
inside them. I also suggest that you read chapter 8 of Documentation/CodingStyle.

> you will see why i
> did as that.

    I repeat, this is kernel-doc style comment, that is used to comment on a 
functions/structures, and then can be automatically processed to create kernel 
documentation. Your case does not fit for /** comment.

> /**
>   *    skb_segment - Perform protocol segmentation on skb.
>   *    @skb: buffer to segment
>   *    @features: features for the output path (see dev->features)
>   *
>   *    This function performs segmentation on the given skb.  It returns
>   *    a pointer to the first in a list of new skbs for the segments.
>   *    In case of error it returns ERR_PTR(err).
>   */
> struct sk_buff *skb_segment

>>> +                * all fragments truesize :
>>> +                * remove (head size + sk_buff + offset)
>>> +                */
>>>                  delta_truesize = skb->truesize -
>>> -                                SKB_TRUESIZE(skb_end_offset(skb));
>>> +                                SKB_TRUESIZE(skb_end_offset(skb) +
>>> offset);
>>>
>>>                  skb->truesize -= skb->data_len;
>>>                  skb->len -= skb->data_len;
>>
>>
>> WBR, Sergei

> Sorry, what is WBR?

    With best regards. Nothing offensive. :-)

WBR, Sergei

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