netdev - Re: [PATCH net-next v10 01/22] net: make page_pool_ref

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Message-ID: <52fffbfb-dadb-48fe-84e4-8296b18fd22e@gmail.com>
Date: Thu, 16 Jan 2025 02:12:06 +0000
From: Pavel Begunkov <asml.silence@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, David Wei <dw@...idwei.uk>
Cc: io-uring@...r.kernel.org, netdev@...r.kernel.org,
 Jens Axboe <axboe@...nel.dk>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>, David Ahern <dsahern@...nel.org>,
 Mina Almasry <almasrymina@...gle.com>,
 Stanislav Fomichev <stfomichev@...il.com>, Joe Damato <jdamato@...tly.com>,
 Pedro Tammela <pctammela@...atatu.com>
Subject: Re: [PATCH net-next v10 01/22] net: make page_pool_ref_netmem work
 with net iovs

On 1/16/25 00:30, Jakub Kicinski wrote:
> On Wed,  8 Jan 2025 14:06:22 -0800 David Wei wrote:
>> From: Pavel Begunkov <asml.silence@...il.com>
>>
>> page_pool_ref_netmem() should work with either netmem representation, but
>> currently it casts to a page with netmem_to_page(), which will fail with
>> net iovs. Use netmem_get_pp_ref_count_ref() instead.
> 
> This is a fix, right? If we try to coalesce a cloned netmem skb
> we'll crash.

True, I missed it it's actually used.

-- 
Pavel Begunkov