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From: Haiyang Zhang <haiyangz@microsoft.com>
To: Jakub Kicinski <kuba@kernel.org>
CC: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>, Dexuan Cui
	<decui@microsoft.com>, "stephen@networkplumber.org"
	<stephen@networkplumber.org>, KY Srinivasan <kys@microsoft.com>, Paul
 Rosswurm <paulros@microsoft.com>, "olaf@aepfle.de" <olaf@aepfle.de>, vkuznets
	<vkuznets@redhat.com>, "davem@davemloft.net" <davem@davemloft.net>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>, "edumazet@google.com"
	<edumazet@google.com>, "pabeni@redhat.com" <pabeni@redhat.com>,
	"leon@kernel.org" <leon@kernel.org>, Long Li <longli@microsoft.com>,
	"ssengar@linux.microsoft.com" <ssengar@linux.microsoft.com>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"daniel@iogearbox.net" <daniel@iogearbox.net>, "john.fastabend@gmail.com"
	<john.fastabend@gmail.com>, "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	"ast@kernel.org" <ast@kernel.org>, "hawk@kernel.org" <hawk@kernel.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>, "shradhagupta@linux.microsoft.com"
	<shradhagupta@linux.microsoft.com>, "linux-kernel@vger.kernel.org"
	<linux-kernel@vger.kernel.org>
Subject: RE: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with 4K
 page size
Thread-Topic: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with 4K
 page size
Thread-Index: AQHapXRSoF8bWF0GzU23EBNbj3wY2rGVoRqAgAABNAA=
Date: Mon, 13 May 2024 20:50:37 +0000
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 <20240513134201.5f5acbae@kernel.org>
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> -----Original Message-----
> From: Jakub Kicinski <kuba@kernel.org>
> Sent: Monday, May 13, 2024 4:42 PM
> To: Haiyang Zhang <haiyangz@microsoft.com>
> Cc: linux-hyperv@vger.kernel.org; netdev@vger.kernel.org; Dexuan Cui
> <decui@microsoft.com>; stephen@networkplumber.org; KY Srinivasan
> <kys@microsoft.com>; Paul Rosswurm <paulros@microsoft.com>;
> olaf@aepfle.de; vkuznets <vkuznets@redhat.com>; davem@davemloft.net;
> wei.liu@kernel.org; edumazet@google.com; pabeni@redhat.com;
> leon@kernel.org; Long Li <longli@microsoft.com>;
> ssengar@linux.microsoft.com; linux-rdma@vger.kernel.org;
> daniel@iogearbox.net; john.fastabend@gmail.com; bpf@vger.kernel.org;
> ast@kernel.org; hawk@kernel.org; tglx@linutronix.de;
> shradhagupta@linux.microsoft.com; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH net-next] net: mana: Enable MANA driver on ARM64 with
> 4K page size
>=20
> 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)
>=20
> 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."=20
https://developer.arm.com/documentation/den0042/a/Coding-for-Cortex-R-Proce=
ssors/Endianness

MANA driver doesn't support big endian.

Thanks,
- Haiyang