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Message-ID: <CANn89iJLAnnvFfkmJbQ=ZFMwaqiYDOTD3-P+NpkEMzP9aKV-ig@mail.gmail.com>
Date: Mon, 3 Jul 2023 19:15:48 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: David Ahern <dsahern@...nel.org>
Cc: Mina Almasry <almasrymina@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <jbrouer@...hat.com>,
brouer@...hat.com, Alexander Duyck <alexander.duyck@...il.com>,
Yunsheng Lin <linyunsheng@...wei.com>, davem@...emloft.net,
pabeni@...hat.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Lorenzo Bianconi <lorenzo@...nel.org>,
Yisen Zhuang <yisen.zhuang@...wei.com>,
Salil Mehta <salil.mehta@...wei.com>,
Sunil Goutham <sgoutham@...vell.com>,
Geetha sowjanya <gakula@...vell.com>,
Subbaraya Sundeep <sbhatta@...vell.com>,
hariprasad <hkelam@...vell.com>,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
Felix Fietkau <nbd@....name>,
Ryder Lee <ryder.lee@...iatek.com>,
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Sean Wang <sean.wang@...iatek.com>,
Kalle Valo <kvalo@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
linux-rdma@...r.kernel.org, linux-wireless@...r.kernel.org,
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Jonathan Lemon <jonathan.lemon@...il.com>
Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5]
page_pool: remove PP_FLAG_PAGE_FRAG flag)
On Mon, Jul 3, 2023 at 4:45 PM David Ahern <dsahern@...nel.org> wrote:
> That is my expectation. The tcpdump is just an easy example of accessing
> the skb page frags. skb_copy_and_csum_bits used by icmp is another
> example that can walk frags wanting access to device memory. You did not
> cause a panic or trip a WARN_ON for example with the tcpdump?
>
ICMP packets do not land on the queues having devmem buffers, for
obvious reasons.
Only chosen TCP flows are steered to these queues.
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