Subject: Re: [PATCH iproute2 v3] bridge: Add master device name to bridge fdb show

From: Roopa Prabhu <[email-masked]>
Date: Sun, 08 Jun 2014 07:44:39 -0700

On 6/8/14, 4:24 AM, Jamal Hadi Salim wrote:
>
> note: The "Self" addresses are derived from uni/multicast addresses of
> the port i.e they are _not_ part of the fdb.
> IMO, it is unfortunate that  the fdb command is being used for
> dealing with device specific multicast/unicast address management
> as is "ip link" - but the API is out there already.
> Therefore they dont really belong to the fdb table and displaying
> the master as the bridge maybe misleading.

sure, you seemed to be using my below patch in your examples for fdb 
filtering.
so thought i should resubmit. I am now ok with either.

Thanks,
Roopa

>
> On 06/08/14 01:23, [email-masked] wrote:
>> From: Roopa Prabhu <[email-masked]>
>>
>> This patch adds master dev name from NDA_MASTER netlink attribute
>>   to bridge fdb show output
>>
>> current iproute2 tries to print 'master' in the output if NTF_MASTER
>> is present. But, kernel today does not set NTF_MASTER during dump
>> requests. Which means I have not seen iproute2 bridge cmd print 
>> 'master' atall.
>> This patch overrides the NTF_MASTER flag if NDA_MASTER attribute is 
>> present.
>>
>> Example output:
>>
>> before this patch:
>> # bridge fdb show
>> 44:38:39:00:27:ba dev bond2.2003 permanent
>> 44:38:39:00:27:bb dev bond4.2003 permanent
>> 44:38:39:00:27:bc dev bond2.2004 permanent
>>
>> After this patch:
>> # bridge fdb show
>> 44:38:39:00:27:ba dev bond2.2003 master br-2003 permanent
>> 44:38:39:00:27:bb dev bond4.2003 master br-2003 permanent
>> 44:38:39:00:27:bc dev bond2.2004 master br-2004 permanent
>>
>> For comparision with the above, below is the output for NTF_SELF today,
>> # bridge fdb show
>> 33:33:00:00:00:01 dev eth0 self permanent
>> 01:00:5e:00:00:01 dev eth0 self permanent
>> 33:33:ff:00:01:cc dev eth0 self permanent
>>
>> If change in output is a concern, 'master' can be put at the end of 
>> the fdb
>> output line or made optional with -d[etails] option.
>>
>> change from v1 to v2:
>>      use 'bridge' instead of 'master' in fdb show output
>>
>> change from v2 to v3:
>>      use 'master' instead of 'bridge' in fdb show output
>>      (master could also be a vxlan device)
>>
>> Signed-off-by: Wilson Kok <[email-masked]>
>> Signed-off-by: Roopa Prabhu <[email-masked]>
>> ---
>>   bridge/fdb.c              |    5 ++++-
>>   include/linux/neighbour.h |    1 +
>>   2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/bridge/fdb.c b/bridge/fdb.c
>> index 9b720e3..d1c3da6 100644
>> --- a/bridge/fdb.c
>> +++ b/bridge/fdb.c
>> @@ -146,7 +146,10 @@ int print_fdb(const struct sockaddr_nl *who, 
>> struct nlmsghdr *n, void *arg)
>>       }
>>       if (r->ndm_flags & NTF_SELF)
>>           fprintf(fp, "self ");
>> -    if (r->ndm_flags & NTF_MASTER)
>> +    if (tb[NDA_MASTER])
>> +        fprintf(fp, "master %s ",
>> +            ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
>> +    else if (r->ndm_flags & NTF_MASTER)
>>           fprintf(fp, "master ");
>>       if (r->ndm_flags & NTF_ROUTER)
>>           fprintf(fp, "router ");
>> diff --git a/include/linux/neighbour.h b/include/linux/neighbour.h
>> index d3ef583..4a1d7e9 100644
>> --- a/include/linux/neighbour.h
>> +++ b/include/linux/neighbour.h
>> @@ -24,6 +24,7 @@ enum {
>>       NDA_PORT,
>>       NDA_VNI,
>>       NDA_IFINDEX,
>> +    NDA_MASTER,
>>       __NDA_MAX
>>   };
>>
>>
>
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