linux-kernel - Re: [PATCH net 3/9] virtio-net: fix page miscount during XDP linearizing

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Message-ID: <585D48A7.3040701@gmail.com>
Date:   Fri, 23 Dec 2016 07:54:15 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     john.r.fastabend@...el.com
Subject: Re: [PATCH net 3/9] virtio-net: fix page miscount during XDP
 linearizing

On 16-12-23 06:37 AM, Jason Wang wrote:
> We don't put page during linearizing, the would cause leaking when
> xmit through XDP_TX or the packet exceeds PAGE_SIZE. Fix them by
> put page accordingly. Also decrease the number of buffers during
> linearizing to make sure caller can free buffers correctly when packet
> exceeds PAGE_SIZE. With this patch, we won't get OOM after linearize
> huge number of packets.
> 
> Cc: John Fastabend <john.r.fastabend@...el.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---

Thanks! looks good. By the way do you happen to have any actual
configuration where this path is hit? I obviously didn't test this
very long other than a quick test with my hacked vhost driver.

Acked-by: John Fastabend <john.r.fastabend@...el.com>