linux-kernel - RE: [EXTERNAL] Re: [PATCH net] net: mana: Switch to page pool for jumbo frames

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Message-ID:
 <MN0PR21MB34373C46ADA00725818EA381CAA72@MN0PR21MB3437.namprd21.prod.outlook.com>
Date: Tue, 25 Mar 2025 16:19:42 +0000
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Dexuan Cui
	<decui@...rosoft.com>, "stephen@...workplumber.org"
	<stephen@...workplumber.org>, KY Srinivasan <kys@...rosoft.com>, Paul
 Rosswurm <paulros@...rosoft.com>, "olaf@...fle.de" <olaf@...fle.de>, vkuznets
	<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>, "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>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>
Subject: RE: [EXTERNAL] Re: [PATCH net] net: mana: Switch to page pool for
 jumbo frames



> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Tuesday, March 25, 2025 12:14 PM
> To: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: linux-hyperv@...r.kernel.org; netdev@...r.kernel.org; Dexuan Cui
> <decui@...rosoft.com>; stephen@...workplumber.org; KY Srinivasan
> <kys@...rosoft.com>; Paul Rosswurm <paulros@...rosoft.com>;
> olaf@...fle.de; vkuznets <vkuznets@...hat.com>; davem@...emloft.net;
> wei.liu@...nel.org; edumazet@...gle.com; pabeni@...hat.com;
> leon@...nel.org; Long Li <longli@...rosoft.com>;
> ssengar@...ux.microsoft.com; linux-rdma@...r.kernel.org;
> daniel@...earbox.net; john.fastabend@...il.com; bpf@...r.kernel.org;
> ast@...nel.org; hawk@...nel.org; tglx@...utronix.de;
> shradhagupta@...ux.microsoft.com; linux-kernel@...r.kernel.org;
> stable@...r.kernel.org
> Subject: [EXTERNAL] Re: [PATCH net] net: mana: Switch to page pool for
> jumbo frames
> 
> On Fri, 21 Mar 2025 18:04:35 -0700 Haiyang Zhang wrote:
> > Since commit 8218f62c9c9b ("mm: page_frag: use initial zero offset for
> > page_frag_alloc_align()"), the netdev_alloc_frag() no longer works for
> > fragsz > PAGE_SIZE. And, this behavior is by design.
> 
> This is inaccurate, AFAIU. The user of frag allocator with fragsz >
> PAGE_SIZE has _always_ been incorrect. It's just that it fails in
> a more obvious way now? Please correct the commit message.

Yes. I will correct the msg.