netdev - Re: [PATCH net-next] net: veth: Page pool creation error handling for existing pools only

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Date: Fri, 11 Aug 2023 22:06:11 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Liang Chen <liangchen.linux@...il.com>, horms@...nel.org,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, linyunsheng@...wei.com
Cc: hawk@...nel.org, ilias.apalodimas@...aro.org, daniel@...earbox.net,
 ast@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: veth: Page pool creation error handling for
 existing pools only



On 11/08/2023 14.16, Liang Chen wrote:
> The failure handling procedure destroys page pools for all queues,
> including those that haven't had their page pool created yet. this patch
> introduces necessary adjustments to prevent potential risks and
> inconsistency with the error handling behavior.
> 
> Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>
> Signed-off-by: Liang Chen <liangchen.linux@...il.com>
> ---

Fixes: 0ebab78cbcbf ("net: veth: add page_pool for page recycling")

But not a critical fix, so net-next is okay.

>   drivers/net/veth.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index 614f3e3efab0..509e901da41d 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -1081,8 +1081,9 @@ static int __veth_napi_enable_range(struct net_device *dev, int start, int end)
>   err_xdp_ring:
>   	for (i--; i >= start; i--)
>   		ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free);
> +	i = end;
>   err_page_pool:
> -	for (i = start; i < end; i++) {
> +	for (i--; i >= start; i--) {
>   		page_pool_destroy(priv->rq[i].page_pool);
>   		priv->rq[i].page_pool = NULL;
>   	}