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Message-ID: <b52b4aa0-ebae-f9a5-f3da-b0c9cc4ba75b@redhat.com>
Date: Fri, 11 Aug 2023 18:35:43 +0200
From: Jesper Dangaard Brouer <jbrouer@...hat.com>
To: Liang Chen <liangchen.linux@...il.com>,
Jesper Dangaard Brouer <hawk@...nel.org>
Cc: brouer@...hat.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, linyunsheng@...wei.com,
ilias.apalodimas@...aro.org, daniel@...earbox.net, ast@...nel.org,
netdev@...r.kernel.org, Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Subject: Re: [RFC PATCH net-next v2 1/2] net: veth: Page pool creation error
handling for existing pools only
On 11/08/2023 14.02, Liang Chen wrote:
> On Wed, Aug 2, 2023 at 4:56 PM Jesper Dangaard Brouer <hawk@...nel.org> wrote:
>>
[...]
>>> page_pool_destroy(priv->rq[i].page_pool);
>>> priv->rq[i].page_pool = NULL;
>>> }
>>
>> The page_pool_destroy() call handles(exits) if called with NULL.
>> So, I don't think this incorrect walking all (start to end) can trigger
>> an actual bug.
>>
>> Anyhow, I do think this is more correct, so you can append my ACK for
>> the real submission.
>>
>> Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>
>>
>
> Thanks! I will separate this patch out and make a real submission,
> since it's a small fix and not really coupled with the optimization
> patch which still needs some further work after receiving feedback
> from Yunsheng.
Sure, send it as a fix commit. Given it is not super critical i think
it is okay to send for net-next, to avoid merge issues/conflicts with
your 2/2 optimization patch. And for good order we should add a Fixes
tag, but IMHO net-next is still okay, given I don't think this can
trigger a bug.
That said, I do want to encourage you to work on 2/2 optimization patch.
I think this is a very important optimization and actually a fix for
then we introduced page_pool to veth. Well spotted! :-)
In 2/2 I keep getting confused by use of kfree_skb_partial() and if the
right conditions are meet.
--Jesper
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