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Date:	Thu, 13 Aug 2015 08:46:39 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	sfeldma@...il.com
Cc:	netdev@...r.kernel.org, jiri@...nulli.us
Subject: Re: [PATCH net-next] rocker: add debugfs support to dump internal
 tables

On Thu, 13 Aug 2015 08:35:16 -0700
sfeldma@...il.com wrote:

> From: Scott Feldman <sfeldma@...il.com>
> 
> > tree /sys/kernel/debug/rocker
> /sys/kernel/debug/rocker
> └── 5254001235010000
>     ├── fdb_tbl
>     ├── internal_vlan_tbl
>     ├── neigh_tbl
>     ├── of_dpa_flow_tbl
>     └── of_dpa_group_tbl
> 
> 1 directory, 5 files
> 
> > cat /sys/kernel/debug/rocker/5254001235010000/internal_vlan_tbl
> ifindex 5 ref_count 1 vlan 3843
> ifindex 7 ref_count 2 vlan 3840
> ifindex 4 ref_count 1 vlan 3842
> 
> > cat /sys/kernel/debug/rocker/5254001235010000/fdb_tbl
> learned 1 pport 1 addr 00:02:00:00:02:00 vlan 3840
> learned 1 pport 2 addr 00:02:00:00:03:00 vlan 3840
> 
> > cat /sys/kernel/debug/rocker/5254001235010000/neigh_tbl
> 11.0.0.9 dev sw1p2 ref_count 3 index 1 dst 00:02:00:00:01:00 ttl_check 1
> 11.0.0.1 dev sw1p1 ref_count 3 index 0 dst 00:02:00:00:00:00 ttl_check 1
> 
> > cat /sys/kernel/debug/rocker/5254001235010000/of_dpa_flow_tbl
> cmd 3 cookie 15 priority 3  tbl acl            in_pport 2 01:80:c2:00:00:00/ff:ff:ff:ff:ff:f0 eth_type 0x0000 vlan_id 3841 ip proto 0/0 ip tos 0/0 group_id 0x0f010000
> cmd 3 cookie 2  priority 0  tbl term_mac       in_pport 1 eth_type 0x0800 52:54:00:12:35:01 vlan_id 3840 goto_tbl ucast_routing copy_to_cpu 0
> cmd 3 cookie 1f priority 3  tbl bridge         00:02:00:00:00:00 vlan_id 3840 tunnel_id 0 goto_tbl acl group_id 0x00000000 copy_to_cpu 0
> cmd 3 cookie 4  priority 1  tbl vlan           in_pport 2 vlan_id 0 goto_tbl term_mac untagged 1 new_vlan_id 3841
> cmd 3 cookie 20 priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.1 goto_tbl acl group_id 0x20000000
> cmd 3 cookie 21 priority 3  tbl bridge         00:02:00:00:01:00 vlan_id 3841 tunnel_id 0 goto_tbl acl group_id 0x00000000 copy_to_cpu 0
> cmd 3 cookie 16 priority 2  tbl acl            in_pport 2 eth_type 0x0806 vlan_id 3841 ip proto 0/0 ip tos 0/0 group_id 0x0f010000
> cmd 3 cookie 12 priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.0 goto_tbl acl group_id 0x0f000000
> cmd 3 cookie 9  priority 3  tbl acl            in_pport 1 01:80:c2:00:00:00/ff:ff:ff:ff:ff:f0 eth_type 0x0000 vlan_id 3840 ip proto 0/0 ip tos 0/0 group_id 0x0f000000
> cmd 3 cookie 6  priority 0  tbl term_mac       in_pport 2 eth_type 0x86dd 52:54:00:12:35:02 vlan_id 3841 goto_tbl ucast_routing copy_to_cpu 0
> cmd 4 cookie 0  priority 1  tbl ig_port        in_pport 0/0xffff0000 goto_tbl vlan
> cmd 4 cookie e  priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.3 goto_tbl acl group_id 0x0f000000
> cmd 3 cookie 1  priority 1  tbl vlan           in_pport 1 vlan_id 0 goto_tbl term_mac untagged 1 new_vlan_id 3840
> cmd 3 cookie 24 priority 20 tbl ucast_routing  eth_type 0x0800 11.0.0.4/255.255.255.252 goto_tbl acl group_id 0x20000000
> cmd 4 cookie 14 priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.10 goto_tbl acl group_id 0x0f010000
> cmd 3 cookie 2c priority 20 tbl ucast_routing  eth_type 0x0800 12.0.0.4 goto_tbl acl group_id 0x20000001
> cmd 3 cookie 17 priority 1  tbl term_mac       in_pport 2 eth_type 0x0800 01:00:5e:00:00:00/ff:ff:ff:80:00:00 vlan_id 3841 goto_tbl mcast_routing copy_to_cpu 1
> cmd 3 cookie 26 priority 20 tbl ucast_routing  eth_type 0x0800 12.0.0.3 goto_tbl acl group_id 0x20000000
> cmd 3 cookie 2e priority 30 tbl ucast_routing  eth_type 0x0800 12.0.0.2 goto_tbl acl group_id 0x0f010000
> cmd 3 cookie 22 priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.9 goto_tbl acl group_id 0x20000001
> cmd 3 cookie 1c priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.8/255.255.255.252 goto_tbl acl group_id 0x0f010000
> cmd 3 cookie 18 priority 1  tbl term_mac       in_pport 2 eth_type 0x86dd 33:33:00:00:00:00/ff:ff:00:00:00:00 vlan_id 3841 goto_tbl mcast_routing copy_to_cpu 1
> cmd 3 cookie 5  priority 0  tbl term_mac       in_pport 2 eth_type 0x0800 52:54:00:12:35:02 vlan_id 3841 goto_tbl ucast_routing copy_to_cpu 0
> cmd 3 cookie a  priority 2  tbl acl            in_pport 1 eth_type 0x0806 vlan_id 3840 ip proto 0/0 ip tos 0/0 group_id 0x0f000000
> cmd 4 cookie 1a priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.11 goto_tbl acl group_id 0x0f010000
> cmd 3 cookie 1e priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.8 goto_tbl acl group_id 0x0f010000
> cmd 3 cookie 3  priority 0  tbl term_mac       in_pport 1 eth_type 0x86dd 52:54:00:12:35:01 vlan_id 3840 goto_tbl ucast_routing copy_to_cpu 0
> cmd 3 cookie b  priority 1  tbl term_mac       in_pport 1 eth_type 0x0800 01:00:5e:00:00:00/ff:ff:ff:80:00:00 vlan_id 3840 goto_tbl mcast_routing copy_to_cpu 1
> cmd 4 cookie 8  priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.2 goto_tbl acl group_id 0x0f000000
> cmd 3 cookie 10 priority 0  tbl ucast_routing  eth_type 0x0800 11.0.0.0/255.255.255.252 goto_tbl acl group_id 0x0f000000
> cmd 3 cookie 28 priority 20 tbl ucast_routing  eth_type 0x0800 11.0.0.12/255.255.255.252 goto_tbl acl group_id 0x20000001
> cmd 3 cookie c  priority 1  tbl term_mac       in_pport 1 eth_type 0x86dd 33:33:00:00:00:00/ff:ff:00:00:00:00 vlan_id 3840 goto_tbl mcast_routing copy_to_cpu 1
> 
> > cat /sys/kernel/debug/rocker/5254001235010000/of_dpa_group_tbl
> cmd 7 group_id 0x0f000000 (L2 interface vlan 3840 port 0) pop_vlan 1
> cmd 7 group_id 0x0f010000 (L2 interface vlan 3841 port 0) pop_vlan 1
> cmd 7 group_id 0x20000000 (L3 unicast index 0) src 52:54:00:12:35:01 dst 00:02:00:00:00:00 vlan 3840 ttl_check 1 group_id 0x0f000001
> cmd 7 group_id 0x0f010002 (L2 interface vlan 3841 port 2) pop_vlan 1
> cmd 7 group_id 0x0f000001 (L2 interface vlan 3840 port 1) pop_vlan 1
> cmd 8 group_id 0x20000001 (L3 unicast index 1) src 52:54:00:12:35:02 dst 00:02:00:00:01:00 vlan 3841 ttl_check 1 group_id 0x0f010002
> 
> Signed-off-by: Scott Feldman <sfeldma@...il.com>

Looks good.
A couple caveats about debugfs.
1) Don't use it for API's not available elsewhere. You don't want it to become
   a stable API which other tools get tied too.
2) Best to make it an optional config option (dependent on DEBUGFS)
   that way it is possible to have rocker support w/o having DEBUGF configured.

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