* [PATCH net v2] ipvlan: Fix return value of ipvlan_queue_xmit()
@ 2023-06-26 9:33 Cambda Zhu
2023-06-27 10:30 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Cambda Zhu @ 2023-06-26 9:33 UTC (permalink / raw)
To: netdev
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
t.feng, Xin Long, Lu Wei, Mahesh Bandewar, Xuan Zhuo, Dust Li,
Tony Lu, Cambda Zhu
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. ipvlan_rcv_frame() will only return RX_HANDLER_CONSUMED
in ipvlan_xmit_mode_l2/l3() because 'local' is true. It's equal to
NET_XMIT_SUCCESS. But dev_forward_skb() can return NET_RX_SUCCESS or
NET_RX_DROP, and returning NET_RX_DROP(NET_XMIT_DROP) will increase
both ipvlan and ipvlan->phy_dev drops counter.
The skb to forward can be treated as xmitted successfully. This patch
makes ipvlan_queue_xmit() return NET_XMIT_SUCCESS for forward skb.
Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.")
Signed-off-by: Cambda Zhu <cambda@linux.alibaba.com>
---
v2:
- Add explanation to commit message.
- Add CC Mahesh.
v1:
- Add Fixes tag.
---
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net v2] ipvlan: Fix return value of ipvlan_queue_xmit()
2023-06-26 9:33 [PATCH net v2] ipvlan: Fix return value of ipvlan_queue_xmit() Cambda Zhu
@ 2023-06-27 10:30 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2023-06-27 10:30 UTC (permalink / raw)
To: Cambda Zhu
Cc: netdev, davem, edumazet, kuba, pabeni, fengtao40, lucien.xin,
luwei32, maheshb, xuanzhuo, dust.li, tonylu
Hello:
This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:
On Mon, 26 Jun 2023 17:33:47 +0800 you wrote:
> 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. ipvlan_rcv_frame() will only return RX_HANDLER_CONSUMED
> in ipvlan_xmit_mode_l2/l3() because 'local' is true. It's equal to
> NET_XMIT_SUCCESS. But dev_forward_skb() can return NET_RX_SUCCESS or
> NET_RX_DROP, and returning NET_RX_DROP(NET_XMIT_DROP) will increase
> both ipvlan and ipvlan->phy_dev drops counter.
>
> [...]
Here is the summary with links:
- [net,v2] ipvlan: Fix return value of ipvlan_queue_xmit()
https://git.kernel.org/netdev/net/c/8a9922e7be6d
You are awesome, thank you!
--
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2023-06-26 9:33 [PATCH net v2] ipvlan: Fix return value of ipvlan_queue_xmit() Cambda Zhu
2023-06-27 10:30 ` patchwork-bot+netdevbpf
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