netdev - Re: [PATCH net] ipvlan: Fix return value of ipvlan_queue

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Message-Id: <30061768-8B85-4E10-AEEC-1A8D4C09D626@linux.alibaba.com>
Date: Fri, 16 Jun 2023 17:05:35 +0800
From: Cambda Zhu <cambda@...ux.alibaba.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Mahesh Bandewar <maheshb@...gle.com>,
 netdev@...r.kernel.org,
 Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 David Ahern <dsahern@...nel.org>,
 Jakub Kicinski <kuba@...nel.org>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 Dust Li <dust.li@...ux.alibaba.com>,
 Tony Lu <tonylu@...ux.alibaba.com>
Subject: Re: [PATCH net] ipvlan: Fix return value of ipvlan_queue_xmit()


> On Jun 16, 2023, at 16:05, Eric Dumazet <edumazet@...gle.com> wrote:
> 
> On Fri, Jun 16, 2023 at 5:34 AM Cambda Zhu <cambda@...ux.alibaba.com> wrote:
>> 
>> The ipvlan_queue_xmit() should return NET_XMIT_XXX,
>> but ipvlan_xmit_mode_l2/l3() returns rx_handler_result_t or NET_RX_XXX
>> in some cases. The skb to forward could be treated as xmitted
>> successfully.
>> 
>> Signed-off-by: Cambda Zhu <cambda@...ux.alibaba.com>
> 
> Please make sure to CC ipvlan author ?
> 
> CC Mahesh
> 
>> ---
>> drivers/net/ipvlan/ipvlan_core.c | 9 ++++++---
>> 1 file changed, 6 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
>> index ab5133eb1d51..e45817caaee8 100644
>> --- a/drivers/net/ipvlan/ipvlan_core.c
>> +++ b/drivers/net/ipvlan/ipvlan_core.c
>> @@ -585,7 +585,8 @@ static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
>>                                consume_skb(skb);
>>                                return NET_XMIT_DROP;
>>                        }
>> -                       return ipvlan_rcv_frame(addr, &skb, true);
>> +                       ipvlan_rcv_frame(addr, &skb, true);
>> +                       return NET_XMIT_SUCCESS;
>>                }
>>        }
>> out:
>> @@ -611,7 +612,8 @@ static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
>>                                        consume_skb(skb);
>>                                        return NET_XMIT_DROP;
>>                                }
>> -                               return ipvlan_rcv_frame(addr, &skb, true);
>> +                               ipvlan_rcv_frame(addr, &skb, true);
>> +                               return NET_XMIT_SUCCESS;
>>                        }
>>                }
>>                skb = skb_share_check(skb, GFP_ATOMIC);
>> @@ -623,7 +625,8 @@ static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
>>                 * the skb for the main-dev. At the RX side we just return
>>                 * RX_PASS for it to be processed further on the stack.
>>                 */
>> -               return dev_forward_skb(ipvlan->phy_dev, skb);
>> +               dev_forward_skb(ipvlan->phy_dev, skb);
>> +               return NET_XMIT_SUCCESS;
>> 
>>        } else if (is_multicast_ether_addr(eth->h_dest)) {
>>                skb_reset_mac_header(skb);
>> --
>> 2.16.6

I have resubmitted v1 patch with Fixes tag and CC Mahesh via reply.

Thanks!
Cambda