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Date:   Wed, 2 Sep 2020 12:14:23 -0400
From:   Murali Karicheri <m-karicheri2@...com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <nsekhar@...com>,
        <grygorii.strashko@...com>
Subject: Re: [PATCH net-next 0/1] Support for VLAN interface over HSR/PRP

All,

On 9/1/20 3:54 PM, Murali Karicheri wrote:
> This series add support for creating VLAN interface over HSR or
> PRP interface. Typically industrial networks uses VLAN in
> deployment and this capability is needed to support these
> networks.
> 
> This is tested using two TI AM572x IDK boards connected back
> to back over CPSW  ports (eth0 and eth1).
> 
> Following is the setup
> 
>                  Physical Setup
>                  ++++++++++++++
>                        
>   _______________    (CPSW)     _______________
>   |              |----eth0-----|               |
>   |TI AM572x IDK1|             | TI AM572x IDK2|
>   |______________|----eth1-----|_______________|
> 
> 
>                  Network Topolgy
>                  +++++++++++++++
> 
>                         TI AM571x IDK  TI AM572x IDK
> 
>                                    
> 192.168.100.10                 CPSW ports                 192.168.100.20
>               IDK-1                                        IDK-2
> hsr0/prp0.100--| 192.168.2.10  |--eth0--| 192.168.2.20 |--hsr0/prp0.100
>                 |----hsr0/prp0--|        |---hsr0/prp0--|
> hsr0/prp0.101--|               |--eth1--|              |--hsr0/prp0/101
> 
> 192.168.101.10                                            192.168.101.20
> 
> Following tests:-
>   - create hsr or prp interface and ping the interface IP address
>     and verify ping is successful.
>   - Create 2 VLANs over hsr or prp interface on both IDKs (VID 100 and
>     101). Ping between the IP address of the VLAN interfaces
>   - Do iperf UDP traffic test with server on one IDK and client on the
>     other. Do this using 100 and 101 subnet IP addresses
>   - Dump /proc/net/vlan/{hsr|prp}0.100 and verify frames are transmitted
>     and received at these interfaces.
>   - Delete the vlan and hsr/prp interface and verify interfaces are
>     removed cleanly.
> 
> Logs for IDK-1 at https://pastebin.ubuntu.com/p/NxF83yZFDX/
> Logs for IDK-2 at https://pastebin.ubuntu.com/p/YBXBcsPgVK/
> 
> Murali Karicheri (1):
>    net: hsr/prp: add vlan support
> 
>   net/hsr/hsr_device.c  |  4 ----
>   net/hsr/hsr_forward.c | 16 +++++++++++++---
>   2 files changed, 13 insertions(+), 7 deletions(-)
> 
I am not sure if the packet flow is right for this?

VLAN over HSR frame format is like this.

<Start of Frame><VLAN tag><HSR Tag><IP><CRC>

My ifconfig stats shows both hsr and hsr0.100 interfaces receiving
frames.

So I did a WARN_ON() in HSR driver before frame is forwarded to upper
layer.

a0868495local@...0868495:~/Projects/upstream-kernel$ git diff
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index de21df30b0d9..545a3cd8c71b 100644
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -415,9 +415,11 @@ static void hsr_forward_do(struct hsr_frame_info 
*frame)
                 }

                 skb->dev = port->dev;
-               if (port->type == HSR_PT_MASTER)
+               if (port->type == HSR_PT_MASTER) {
+                       if (skb_vlan_tag_present(skb))
+                               WARN_ON(1);
                         hsr_deliver_master(skb, port->dev, 
frame->node_src);
-               else
+               } else
                         hsr_xmit(skb, port, frame);
         }
  }

And I get the trace shown below.

[  275.125431] WARNING: CPU: 0 PID: 0 at net/hsr/hsr_forward.c:420 
hsr_forward_skb+0x460/0x564
[  275.133822] Modules linked in: snd_soc_omap_hdmi snd_soc_ti_sdma 
snd_soc_core snd_pcm_dmaengine snd_pcm snd_time4
[  275.199705] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W 
5.9.0-rc1-00658-g473e463812c2-dirty #8
[  275.209573] Hardware name: Generic DRA74X (Flattened Device Tree)
[  275.215703] [<c011177c>] (unwind_backtrace) from [<c010b6f0>] 
(show_stack+0x10/0x14)
[  275.223487] [<c010b6f0>] (show_stack) from [<c055690c>] 
(dump_stack+0xc4/0xe4)
[  275.230747] [<c055690c>] (dump_stack) from [<c01386ac>] 
(__warn+0xc0/0xf4)
[  275.237656] [<c01386ac>] (__warn) from [<c0138a3c>] 
(warn_slowpath_fmt+0x58/0xb8)
[  275.245177] [<c0138a3c>] (warn_slowpath_fmt) from [<c09564bc>] 
(hsr_forward_skb+0x460/0x564)
[  275.253657] [<c09564bc>] (hsr_forward_skb) from [<c0955534>] 
(hsr_handle_frame+0x15c/0x190)
[  275.262047] [<c0955534>] (hsr_handle_frame) from [<c07c6704>] 
(__netif_receive_skb_core+0x23c/0xc88)
[  275.271223] [<c07c6704>] (__netif_receive_skb_core) from [<c07c7180>] 
(__netif_receive_skb_one_core+0x30/0x74)
[  275.281266] [<c07c7180>] (__netif_receive_skb_one_core) from 
[<c07c72a4>] (netif_receive_skb+0x50/0x1c4)
[  275.290793] [<c07c72a4>] (netif_receive_skb) from [<c071a55c>] 
(cpsw_rx_handler+0x230/0x308)
[  275.299272] [<c071a55c>] (cpsw_rx_handler) from [<c0715ee8>] 
(__cpdma_chan_process+0xf4/0x188)
[  275.307925] [<c0715ee8>] (__cpdma_chan_process) from [<c0717294>] 
(cpdma_chan_process+0x3c/0x5c)
[  275.316754] [<c0717294>] (cpdma_chan_process) from [<c071dd14>] 
(cpsw_rx_mq_poll+0x44/0x98)
[  275.325145] [<c071dd14>] (cpsw_rx_mq_poll) from [<c07c8ae0>] 
(net_rx_action+0xf0/0x400)
[  275.333185] [<c07c8ae0>] (net_rx_action) from [<c0101370>] 
(__do_softirq+0xf0/0x3ac)
[  275.340965] [<c0101370>] (__do_softirq) from [<c013f5ec>] 
(irq_exit+0xa8/0xe4)
[  275.348224] [<c013f5ec>] (irq_exit) from [<c0199344>] 
(__handle_domain_irq+0x6c/0xe0)
[  275.356093] [<c0199344>] (__handle_domain_irq) from [<c056f8fc>] 
(gic_handle_irq+0x4c/0xa8)
[  275.364481] [<c056f8fc>] (gic_handle_irq) from [<c0100b6c>] 
(__irq_svc+0x6c/0x90)
[  275.371996] Exception stack(0xc0e01f18 to 0xc0e01f60)

Shouldn't it show vlan_do_receive() ?

	if (skb_vlan_tag_present(skb)) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
		if (vlan_do_receive(&skb))
			goto another_round;
		else if (unlikely(!skb))
			goto out;
	}

Thanks

-- 
Murali Karicheri
Texas Instruments

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