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Message-ID: <31db0e5d-4b6d-9b2e-90cc-87a15d500b2e@kernel.org>
Date: Mon, 3 Jul 2023 11:25:50 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Mina Almasry <almasrymina@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
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AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
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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 7/3/23 11:15 AM, Eric Dumazet wrote:
> 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.
I was not referring to ICMP packets coming in to the nic, but rather an
icmp getting triggered during stack processing.
>
> Only chosen TCP flows are steered to these queues.
of course.
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