linux-kernel - Re: [PATCH net-next 6/6] net: hns3: use napi_consume

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Date:   Tue, 15 Sep 2020 05:09:55 +0000
From:   Saeed Mahameed <saeedm@...dia.com>
To:     "tanhuazhong@...wei.com" <tanhuazhong@...wei.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "yisen.zhuang@...wei.com" <yisen.zhuang@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linyunsheng@...wei.com" <linyunsheng@...wei.com>,
        "kuba@...nel.org" <kuba@...nel.org>
Subject: Re: [PATCH net-next 6/6] net: hns3: use napi_consume_skb() when
 cleaning tx desc

On Mon, 2020-09-14 at 20:06 +0800, Huazhong Tan wrote:
> From: Yunsheng Lin <linyunsheng@...wei.com>
> 
> Use napi_consume_skb() to batch consuming skb when cleaning
> tx desc in NAPI polling.
> 
> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c    | 27 +++++++++++-
> ----------
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.h    |  2 +-
>  drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c |  4 ++--
>  3 files changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 4a49a76..feeaf75 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> @@ -2333,10 +2333,10 @@ static int hns3_alloc_buffer(struct
> hns3_enet_ring *ring,
>  }
>  
>  static void hns3_free_buffer(struct hns3_enet_ring *ring,
> -			     struct hns3_desc_cb *cb)
> +			     struct hns3_desc_cb *cb, int budget)
>  {
>  	if (cb->type == DESC_TYPE_SKB)
> -		dev_kfree_skb_any((struct sk_buff *)cb->priv);
> +		napi_consume_skb(cb->priv, budget);

This code can be reached from hns3_lb_clear_tx_ring() below which is
your loopback test and called with non-zero budget, I am not sure you
are allowed to call napi_consume_skb() with non-zero budget outside
napi context, perhaps the cb->type for loopback test is different in lb
test case ? Idk.. , please double check other code paths.

[...]

>  static void hns3_lb_clear_tx_ring(struct hns3_nic_priv *priv, u32
> start_ringid,
> -				  u32 end_ringid, u32 budget)
> +				  u32 end_ringid, int budget)
>  {
>  	u32 i;
>  
>  	for (i = start_ringid; i <= end_ringid; i++) {
>  		struct hns3_enet_ring *ring = &priv->ring[i];
>  
> -		hns3_clean_tx_ring(ring);
> +		hns3_clean_tx_ring(ring, budget);
>  	}
>  }
>