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Date: Sat, 06 Dec 2014 00:03:30 -0800
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: Scott Feldman <sfeldma@...il.com>
CC: Jiří Pírko <jiri@...nulli.us>,
Jamal Hadi Salim <jhs@...atatu.com>,
Benjamin LaHaise <bcrl@...ck.org>, Thomas Graf <tgraf@...g.ch>,
john fastabend <john.fastabend@...il.com>,
"stephen@...workplumber.org" <stephen@...workplumber.org>,
John Linville <linville@...driver.com>,
"vyasevic@...hat.com" <vyasevic@...hat.com>,
Netdev <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>, shm@...ulusnetworks.com,
Andy Gospodarek <gospo@...ulusnetworks.com>
Subject: Re: [PATCH v2 iproute] bridge link: add option 'self'
On 12/5/14, 9:36 PM, Scott Feldman wrote:
> On Fri, Dec 5, 2014 at 4:59 PM, <roopa@...ulusnetworks.com> wrote:
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>
>> Currently self is set internally only if hwmode is set.
>> This makes it necessary for the hw to have a mode.
>> There is no hwmode really required to go to hardware. So, introduce
>> self for anybody who wants to target hardware.
>>
>> v1 -> v2
>> - fix a few bugs. Initialize flags to zero: this was required to
>> keep the current behaviour unchanged.
>>
>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>> ---
>> bridge/link.c | 9 ++++++---
>> 1 file changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/bridge/link.c b/bridge/link.c
>> index 90d9e7f..b8b8675 100644
>> --- a/bridge/link.c
>> +++ b/bridge/link.c
>> @@ -261,7 +261,7 @@ static int brlink_modify(int argc, char **argv)
>> __s16 priority = -1;
>> __s8 state = -1;
>> __s16 mode = -1;
>> - __u16 flags = BRIDGE_FLAGS_MASTER;
>> + __u16 flags = 0;
> I don't follow why this change is necessary. Seems defaulting to
> MASTER unless SELF is set due to "self" or "hwmode" would be more
> correct (and expected).
That flags initialization was always a no-op. IFLA_BRIDGE_FLAGS was
always set only with the 'self' flag on.
And i don't want to change that unnecessarily with my patch.
Setting it to master now means we will always include IFLA_AF_SPEC with
IFLA_BRIDGE_FLAGS in every 'bridge setlink' msg.
Which will be a change from the current behavior. And i dont intend to
introduce it with this patch.
Kernel has always treated no flags as 'master', so we are good from
kernel perspective.
>
>> struct rtattr *nest;
>>
>> memset(&req, 0, sizeof(req));
>> @@ -321,6 +321,8 @@ static int brlink_modify(int argc, char **argv)
>> "\"veb\".\n");
>> exit(-1);
>> }
>> + } else if (strcmp(*argv, "self") == 0) {
>> + flags = BRIDGE_FLAGS_SELF;
>> } else {
>> usage();
>> }
>> @@ -375,10 +377,11 @@ static int brlink_modify(int argc, char **argv)
>> * devices so far. Thus we only need to include the flags attribute
>> * if we are setting the hw mode.
>> */
> The comment above needs to be updated to reflect the new logic.
ok, will do, Thanks
>
>> - if (mode >= 0) {
>> + if (mode >= 0 || flags > 0) {
>> nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
>>
>> - addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
>> + if (flags > 0)
>> + addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
>>
>> if (mode >= 0)
>> addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
>> --
>> 1.7.10.4
>>
> --
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