netdev - Re: [PATCH RFC iproute2-next 1/2] rdma: add 'link add/delete' commands

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Date:   Wed, 28 Nov 2018 14:18:55 -0600
From:   Steve Wise <swise@...ngridcomputing.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     dsahern@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        BMT@...ich.ibm.com
Subject: Re: [PATCH RFC iproute2-next 1/2] rdma: add 'link add/delete'
 commands



On 11/28/2018 2:13 PM, Leon Romanovsky wrote:
> On Wed, Nov 28, 2018 at 02:07:29PM -0600, Steve Wise wrote:
>>
>> On 11/28/2018 2:04 PM, Leon Romanovsky wrote:
>>> On Wed, Nov 28, 2018 at 01:08:05PM -0600, Steve Wise wrote:
>>>> On 11/28/2018 12:26 PM, Leon Romanovsky wrote:
>>>>> On Thu, Sep 13, 2018 at 10:19:21AM -0700, Steve Wise wrote:
>>>>>> Add new 'link' subcommand 'add' and 'delete' to allow binding a soft-rdma
>>>>>> device to a netdev interface.
>>>>>>
>>>>>> EG:
>>>>>>
>>>>>> rdma link add rxe_eth0 type rxe dev eth0
>>>>>> rdma link delete rxe_eth0
>>>>>>
>>>>>> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
>>>>>> ---
>>>>>>  rdma/link.c  | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>>>>  rdma/rdma.h  |   1 +
>>>>>>  rdma/utils.c |   2 +-
>>>>>>  3 files changed, 108 insertions(+), 1 deletion(-)
>>>>>>
>>>>>> diff --git a/rdma/link.c b/rdma/link.c
>>>>>> index 7a6d4b7e356d..d4f76b0ce11f 100644
>>>>>> --- a/rdma/link.c
>>>>>> +++ b/rdma/link.c
>>>>>> @@ -14,6 +14,8 @@
>>>>>>  static int link_help(struct rd *rd)
>>>>>>  {
>>>>>>  	pr_out("Usage: %s link show [DEV/PORT_INDEX]\n", rd->filename);
>>>>>> +	pr_out("Usage: %s link add NAME type TYPE dev DEV\n", rd->filename);
>>>>> I suggest to rename "dev" to be "netdev", because we are using "dev" for
>>>>> ib devices.
>>>> Yea ok.
>>>>
>>>>>> +	pr_out("Usage: %s link delete NAME type TYPE\n", rd->filename);
>>>>> Why do you need "type" for "delete" command?
>>>> Because the type is used in the kernel to find the appropriate link
>>>> ops.  I could change the kernel side to search all types for the device
>>>> name to delete? 
>>> I would say, yes.
>>> It makes "delete" operation more natural.
>>>
>>> Thanks
>> Perhaps.
>>
>> Note: 'ip link delete' takes a type as well...
> According to man section, yes.
> According to various guides, no.
> https://docs.fedoraproject.org/en-US/Fedora/20/html/Networking_Guide/sec-Configure_802_1Q_VLAN_Tagging_ip_Commands.html
>
> Thanks

It does make sense to not require type.  The name must be unique so that
should be enough.  I'll have to respin the kernel side though...

Thanks,

Steve.