netdev - Re: [PATCH iproute2 net-next] bridge: add option extern_learn to set NTF_EXT

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Date:   Tue, 20 Mar 2018 09:30:21 -0600
From:   David Ahern <dsahern@...il.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH iproute2 net-next] bridge: add option extern_learn to set
 NTF_EXT_LEARNED on fdb entries

On 3/19/18 12:05 PM, Roopa Prabhu wrote:
> On Mon, Mar 19, 2018 at 10:56 AM, David Ahern <dsahern@...il.com> wrote:
>> On 3/19/18 11:54 AM, Stephen Hemminger wrote:
>>> On Mon, 19 Mar 2018 10:20:10 -0700
>>> Roopa Prabhu <roopa@...ulusnetworks.com> wrote:
>>>
>>>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>>
>>>> NTF_EXT_LEARNED can be set by a user on bridge fdb entry.
>>>> Provide a bridge command option to allow a user to set
>>>> NTF_EXT_LEARNED on a bridge fdb entry.
>>>>
>>>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>> ---
>>>>  bridge/fdb.c      | 4 +++-
>>>>  man/man8/bridge.8 | 8 +++++++-
>>>>  2 files changed, 10 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/bridge/fdb.c b/bridge/fdb.c
>>>> index 205b4fa..4dbc894 100644
>>>> --- a/bridge/fdb.c
>>>> +++ b/bridge/fdb.c
>>>> @@ -36,7 +36,7 @@ static void usage(void)
>>>>  {
>>>>      fprintf(stderr,
>>>>              "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
>>>> -            "              [ self ] [ master ] [ use ] [ router ]\n"
>>>> +            "              [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n"
>>>>              "              [ local | static | dynamic ] [ dst IPADDR ] [ vlan VID ]\n"
>>>>              "              [ port PORT] [ vni VNI ] [ via DEV ]\n"
>>>>              "       bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] [ state STATE ] ]\n");
>>>> @@ -412,6 +412,8 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv)
>>>>                      vid = atoi(*argv);
>>>>              } else if (matches(*argv, "use") == 0) {
>>>>                      req.ndm.ndm_flags |= NTF_USE;
>>>> +            } else if (matches(*argv, "extern_learn") == 0) {
>>>> +                    req.ndm.ndm_flags |= NTF_EXT_LEARNED;
>>>>              } else {
>>>>                      if (strcmp(*argv, "to") == 0)
>>>>                              NEXT_ARG();
>>>> diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
>>>> index 05512b0..e7f7148 100644
>>>> --- a/man/man8/bridge.8
>>>> +++ b/man/man8/bridge.8
>>>> @@ -61,7 +61,7 @@ bridge \- show / manipulate bridge addresses and devices
>>>>  .B dev
>>>>  .IR DEV " { "
>>>>  .BR local " | " static " | " dynamic " } [ "
>>>> -.BR self " ] [ " master " ] [ " router " ] [ " use " ] [ "
>>>> +.BR self " ] [ " master " ] [ " router " ] [ " use " ] [ " extern_learn " ] [ "
>>>>  .B dst
>>>>  .IR IPADDR " ] [ "
>>>>  .B vni
>>>> @@ -414,6 +414,12 @@ route shortcircuit enabled.
>>>>  indicate to the kernel that the fdb entry is in use.
>>>>  .sp
>>>>
>>>> +.B extern_learn
>>>> +- this entry was learned externally. This option can be used to
>>>> +indicate to the kernel that an entry was hardware or user-space
>>>> +controller learnt dynamic entry. Kernel will not age such an entry.
>>>> +.sp
>>>> +
>>>>  .in -8
>>>>  The next command line parameters apply only
>>>>  when the specified device
>>>
>>>
>>> What about displaying the flag as well?
>>>
>>
>> Also, I believe other commands have converged on 'external' for the keyword.
> 
> 
> There is already code to display it and it displays it as
> 'extern_learn' (hence the choice of extern_learn)
> 
> static void fdb_print_flags(FILE *fp, unsigned int flags)
> 
> {
> 
>         ....
> 
> 
>         if (flags & NTF_EXT_LEARNED)
> 
>                 print_string(PRINT_ANY, NULL, "%s ", "extern_learn");
> 
>         ....
> }
> 

ok. Applied to iproute2-next