linux-kernel - RE: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with 4K page size

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Date: Mon, 13 May 2024 20:50:37 +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>
Subject: RE: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with 4K
 page size



> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Monday, May 13, 2024 4:42 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
> Subject: Re: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with
> 4K page size
> 
> On Mon, 13 May 2024 13:29:01 -0700 Haiyang Zhang wrote:
> > -	depends on PCI_MSI && X86_64
> > +	depends on PCI_MSI
> > +	depends on X86_64 || (ARM64 && !CPU_BIG_ENDIAN && ARM64_4K_PAGES)
> 
> Can ARM64 be big endian?

>From the document, it can be:
"ARM cores support both modes, but are most commonly used in, and typically default to little-endian mode. Most Linux distributions for ARM tend to be little-endian only." 
https://developer.arm.com/documentation/den0042/a/Coding-for-Cortex-R-Processors/Endianness

MANA driver doesn't support big endian.

Thanks,
- Haiyang