linux-kernel - Re: [PATCH net-next v10 0/4] fix the DMA API misuse problem for page

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Message-ID: <20250227181550.07e429f5@kernel.org>
Date: Thu, 27 Feb 2025 18:15:50 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: <davem@...emloft.net>, <pabeni@...hat.com>, <zhangkun09@...wei.com>,
 <liuyonglong@...wei.com>, <fanghaiqing@...wei.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>, Robin Murphy <robin.murphy@....com>,
 Alexander Duyck <alexander.duyck@...il.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Gaurav Batra <gbatra@...ux.ibm.com>, Matthew
 Rosato <mjrosato@...ux.ibm.com>, IOMMU <iommu@...ts.linux.dev>, MM
 <linux-mm@...ck.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John
 Fastabend <john.fastabend@...il.com>, Matthias Brugger
 <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, <netdev@...r.kernel.org>,
 <intel-wired-lan@...ts.osuosl.org>, <bpf@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net-next v10 0/4] fix the DMA API misuse problem for
 page_pool

On Wed, 26 Feb 2025 19:03:35 +0800 Yunsheng Lin wrote:
> This patchset fix the dma API misuse problem as below:
> Networking driver with page_pool support may hand over page
> still with dma mapping to network stack and try to reuse that
> page after network stack is done with it and passes it back
> to page_pool to avoid the penalty of dma mapping/unmapping.
> With all the caching in the network stack, some pages may be
> held in the network stack without returning to the page_pool
> soon enough, and with VF disable causing the driver unbound,
> the page_pool does not stop the driver from doing it's
> unbounding work, instead page_pool uses workqueue to check
> if there is some pages coming back from the network stack
> periodically, if there is any, it will do the dma unmmapping
> related cleanup work.

Does not build :( Always do an allmodconfig build when working 
on subsystem-wide interfaces..
-- 
pw-bot: cr