netdev - Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of page

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Message-ID: <20180326171938.47dc699e@redhat.com>
Date:   Mon, 26 Mar 2018 17:19:38 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org,
        BjörnTöpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, eugenia@...lanox.com,
        Jason Wang <jasowang@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>, galp@...lanox.com,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>, brouer@...hat.com
Subject: Re: [bpf-next V5 PATCH 11/15] page_pool: refurbish version of
 page_pool code

On Fri, 23 Mar 2018 07:55:37 -0700
Eric Dumazet <eric.dumazet@...il.com> wrote:

> rcu grace period before freeing huge quantitites of pages is
> problematic and could be used by syzbot to OOM the host.

Okay. Adjusted code to empty ring "right-way" when driver calls
destroy, and then only RCU delay/free the page_pool pointer and also
free/empty ring for pages of any in-flight producers.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer