netdev - Re: netdev_alloc_skb is failing for 16k length

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Date:   Tue, 28 May 2019 15:38:18 +0530
From:   Arun Kumar Neelakantam <aneela@...eaurora.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Chris Lew <clew@...eaurora.org>
Subject: Re: netdev_alloc_skb is failing for 16k length

On 5/27/2019 8:29 PM, Stephen Hemminger wrote:
> On Mon, 27 May 2019 12:21:51 +0530
> Arun Kumar Neelakantam <aneela@...eaurora.org> wrote:
>
>> Hi team,
>>
>> we are using "skb = netdev_alloc_skb(NULL, len);" which is getting
>> failed sometimes for len = 16k.
>>
>> I suspect mostly system memory got fragmented and hence atomic memory
>> allocation for 16k is failing, can you please suggest best way to handle
>> this failure case.
>>
>> Thanks
>>
>> Arun N
>>
> If you are handling big frames, then put the data in page size chunks
> and use build_skb.

Thank you. Now using alloc_skb_with_frags() with order 0 to allocate the 
memory fragments

and skb_store_bits() to store the data to skb from buffer.