linux-kernel - Re: [PATCH net-next] net: mana: Add page pool for RX buffers

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Message-ID: <85bfa818-6856-e3ea-ef4d-16646c57d1cc@redhat.com>
Date:   Fri, 14 Jul 2023 09:43:04 +0200
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     brouer@...hat.com,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Paul Rosswurm <paulros@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "leon@...nel.org" <leon@...nel.org>,
        Long Li <longli@...rosoft.com>,
        "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "shradhagupta@...ux.microsoft.com" <shradhagupta@...ux.microsoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: Re: [PATCH net-next] net: mana: Add page pool for RX buffers



On 14/07/2023 05.53, Jakub Kicinski wrote:
> On Thu, 13 Jul 2023 14:48:45 +0000 Haiyang Zhang wrote:
>> Add page pool for RX buffers for faster buffer cycle and reduce CPU
>> usage.
>>
>> Get an extra ref count of a page after allocation, so after upper
>> layers put the page, it's still referenced by the pool. We can reuse
>> it as RX buffer without alloc a new page.
> 
> Please use the real page_pool API from include/net/page_pool.h
> We've moved past every driver reinventing the wheel, sorry.

+1

Quoting[1]: Documentation/networking/page_pool.rst

  Basic use involves replacing alloc_pages() calls with the 
page_pool_alloc_pages() call.
  Drivers should use page_pool_dev_alloc_pages() replacing 
dev_alloc_pages().


[1] https://kernel.org/doc/html/latest/networking/page_pool.html