linux-kernel - Re: [PATCH] net: Relax the npages test against MAX_SKB

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Message-ID: <c6f895470c8c4c36ad1ed2c5ebfbe82c@huawei.com>
Date:   Wed, 19 Aug 2020 01:48:15 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Eric Dumazet <edumazet@...gle.com>
CC:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "martin.varghese@...ia.com" <martin.varghese@...ia.com>,
        Florian Westphal <fw@...len.de>,
        Pravin B Shelar <pshelar@....org>,
        Davide Caratti <dcaratti@...hat.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "Paolo Abeni" <pabeni@...hat.com>,
        "shmulik@...anetworks.com" <shmulik@...anetworks.com>,
        "kyk.segfault@...il.com" <kyk.segfault@...il.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: Relax the npages test against MAX_SKB_FRAGS

Eric Dumazet <edumazet@...gle.com> wrote:
>On Tue, Aug 18, 2020 at 4:58 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>>
>> The npages test against MAX_SKB_FRAGS can be relaxed if we succeed to 
>> allocate high order pages as the note in comment said.
>>
>
>
>We do not want this change.
>
>This interface is used by datagram providers, we do not want to claim they can safely use skb allocations over 64KB.
>
>Returning -EMSGSIZE should not depend on availability of high-order pages.
>
>The comment was a hint, but we need first a valid user before considering expanding the interface.

I see. Many thanks for reply and explaination. :)