netdev - Re: [PATCH net 2/9] net: hns3: add sync command to sync io-pgtable

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Message-ID: <20241015181933.3e7afbe3@kernel.org>
Date: Tue, 15 Oct 2024 18:19:33 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jijie Shao <shaojijie@...wei.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <shenjian15@...wei.com>, <salil.mehta@...wei.com>,
 <liuyonglong@...wei.com>, <wangpeiyang1@...wei.com>, <lanhao@...wei.com>,
 <chenhao418@...wei.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 2/9] net: hns3: add sync command to sync io-pgtable

On Fri, 11 Oct 2024 17:45:14 +0800 Jijie Shao wrote:
> To avoid errors in pgtable prefectch, add a sync command to sync
> io-pagtable.

I've never seen net drivers call iommu_iotlb functions.
Could you provide more context on what this is doing and 
why such unusual handling is necessary?