linux-kernel - Re: [PATCH v3 net-next 2/2] tcp: minor optimization around tcp

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Message-ID: <CALOAHbBJs_8iTX+JbcG3bbqnH+xY6F16ii7N22y2cwmDzb8HFQ@mail.gmail.com>
Date:   Tue, 29 May 2018 19:08:58 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Song Liu <songliubraving@...com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 net-next 2/2] tcp: minor optimization around tcp_hdr()
 usage in tcp receive path

On Tue, May 29, 2018 at 12:53 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>
> On 05/28/2018 05:41 PM, Yafang Shao wrote:
>
>> OK.
>>
>> And what about introducing a new helper tcp_hdr_fast() ?
>>
>> /* use it when tcp header has not been pulled yet */
>> static inline struct tcphdr *tcp_hdr_fast(const struct sk_buff *skb)
>>
>> {
>>
>>         return (const struct tcphdr *)skb->data;
>>
>> }
>>
>>
>> That could help us to use this optimized one instead of the original
>> one if possilbe.
>
>
> I would rather not add such macro...
>
> The call site needs to know what is going on, so having a macro like that would not help.

OK