linux-kernel - Re: [PATCH V3,net-next, 2/4] net: mana: Refactor RX buffer allocation code to prepare for various MTU

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Message-ID: <20230413165929.GU17993@unreal>
Date:   Thu, 13 Apr 2023 19:59:29 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Haiyang Zhang <haiyangz@...rosoft.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>,
        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>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3,net-next, 2/4] net: mana: Refactor RX buffer
 allocation code to prepare for various MTU

On Thu, Apr 13, 2023 at 09:40:03AM -0700, Jakub Kicinski wrote:
> On Thu, 13 Apr 2023 19:30:59 +0300 Leon Romanovsky wrote:
> > > So the page pool is optimized for the XDP, and that sentence is applicable to drivers
> > > that have set up page pool for XDP optimization.  
> > 
> > "but it can fallback on the regular page allocator APIs."
> 
> The XDP thing is historic AFAIU, page_pool has been expanded to cover
> all uses cases, and is "just better" (tm) than using page allocator
> directly. Maybe we should update the doc.

The last sentence is always true :)