Subject: Re: [PATCH net-next 2/4] bridge: Allow an ability to designate an uplink port

From: Vlad Yasevich <[email-masked]>
Date: Wed, 13 Mar 2013 19:43:57 -0400

On 03/13/2013 04:33 PM, Michael S. Tsirkin wrote:
> On Tue, Mar 12, 2013 at 09:45:24PM -0400, Vlad Yasevich wrote:
>> Allow a ports to be designated as uplink.  Multiple ports
>> may be designated as uplinks and they will be kept in a
>> list.
>>
>> Signed-off-by: Vlad Yasevich <[email-masked]>
>
> It looks like if you make two links uplink, bridging
> between them won't work at all?

only if they are non-promisc, but yes it does look like that...

hm... I need to think about this...

-vlad

>
>> ---
>>   include/uapi/linux/if_link.h |    1 +
>>   net/bridge/br_netlink.c      |    2 ++
>>   net/bridge/br_private.h      |    1 +
>>   net/bridge/br_sysfs_if.c     |    2 ++
>>   4 files changed, 6 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>> index c4edfe1..b9444e9 100644
>> --- a/include/uapi/linux/if_link.h
>> +++ b/include/uapi/linux/if_link.h
>> @@ -220,6 +220,7 @@ enum {
>>   	IFLA_BRPORT_GUARD,	/* bpdu guard              */
>>   	IFLA_BRPORT_PROTECT,	/* root port protection    */
>>   	IFLA_BRPORT_FAST_LEAVE,	/* multicast fast leave    */
>> +	IFLA_BRPORT_UPLINK,	/* uplink port */
>>   	__IFLA_BRPORT_MAX
>>   };
>>   #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>> index 27aa3ee..e08a50e 100644
>> --- a/net/bridge/br_netlink.c
>> +++ b/net/bridge/br_netlink.c
>> @@ -283,6 +283,7 @@ static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
>>   	[IFLA_BRPORT_MODE]	= { .type = NLA_U8 },
>>   	[IFLA_BRPORT_GUARD]	= { .type = NLA_U8 },
>>   	[IFLA_BRPORT_PROTECT]	= { .type = NLA_U8 },
>> +	[IFLA_BRPORT_UPLINK]	= { .type = NLA_U8 },
>>   };
>>
>>   /* Change the state of the port and notify spanning tree */
>> @@ -329,6 +330,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
>>   	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
>>   	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
>>   	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
>> +	br_set_port_flag(p, tb, IFLA_BRPORT_UPLINK, BR_UPLINK);
>>
>>   	if (tb[IFLA_BRPORT_COST]) {
>>   		err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
>> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
>> index 4a0fa29..44ae584 100644
>> --- a/net/bridge/br_private.h
>> +++ b/net/bridge/br_private.h
>> @@ -156,6 +156,7 @@ struct net_bridge_port
>>   #define BR_BPDU_GUARD           0x00000002
>>   #define BR_ROOT_BLOCK		0x00000004
>>   #define BR_MULTICAST_FAST_LEAVE	0x00000008
>> +#define BR_UPLINK		0x00000010
>>
>>   #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
>>   	u32				multicast_startup_queries_sent;
>> diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
>> index a1ef1b6..1f28cd4 100644
>> --- a/net/bridge/br_sysfs_if.c
>> +++ b/net/bridge/br_sysfs_if.c
>> @@ -158,6 +158,7 @@ static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
>>   BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
>>   BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
>>   BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
>> +BRPORT_ATTR_FLAG(uplink, BR_UPLINK);
>>
>>   #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
>>   static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
>> @@ -195,6 +196,7 @@ static const struct brport_attribute *brport_attrs[] = {
>>   	&brport_attr_hairpin_mode,
>>   	&brport_attr_bpdu_guard,
>>   	&brport_attr_root_block,
>> +	&brport_attr_uplink,
>>   #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
>>   	&brport_attr_multicast_router,
>>   	&brport_attr_multicast_fast_leave,
>> --
>> 1.7.7.6
>>
>> --
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