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authorJohn Fastabend <john.r.fastabend@intel.com>2012-10-24 08:13:03 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-31 13:18:29 -0400
commit2469ffd723f76ac2d3ce3d4f31ee31ee0a06cd38 (patch)
treed385b74ac144c06e11e70e2ace08b00b3433d77f /net/bridge/br_private.h
parente5a55a898720096f43bc24938f8875c0a1b34cd7 (diff)
net: set and query VEB/VEPA bridge mode via PF_BRIDGE
Hardware switches may support enabling and disabling the loopback switch which puts the device in a VEPA mode defined in the IEEE 802.1Qbg specification. In this mode frames are not switched in the hardware but sent directly to the switch. SR-IOV capable NICs will likely support this mode I am aware of at least two such devices. Also I am told (but don't have any of this hardware available) that there are devices that only support VEPA modes. In these cases it is important at a minimum to be able to query these attributes. This patch adds an additional IFLA_BRIDGE_MODE attribute that can be set and dumped via the PF_BRIDGE:{SET|GET}LINK operations. Also anticipating bridge attributes that may be common for both embedded bridges and software bridges this adds a flags attribute IFLA_BRIDGE_FLAGS currently used to determine if the command or event is being generated to/from an embedded bridge or software bridge. Finally, the event generation is pulled out of the bridge module and into rtnetlink proper. For example using the macvlan driver in VEPA mode on top of an embedded switch requires putting the embedded switch into a VEPA mode to get the expected results. -------- -------- | VEPA | | VEPA | <-- macvlan vepa edge relays -------- -------- | | | | ------------------ | VEPA | <-- embedded switch in NIC ------------------ | | ------------------- | external switch | <-- shiny new physical ------------------- switch with VEPA support A packet sent from the macvlan VEPA at the top could be loopbacked on the embedded switch and never seen by the external switch. So in order for this to work the embedded switch needs to be set in the VEPA state via the above described commands. By making these attributes nested in IFLA_AF_SPEC we allow future extensions to be made as needed. CC: Lennert Buytenhek <buytenh@wantstofly.org> CC: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_private.h')
-rw-r--r--net/bridge/br_private.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index fdcd5f626ca..6f40c14a2a6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -158,7 +158,9 @@ struct net_bridge_port
static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
{
- struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data);
+ struct net_bridge_port *port =
+ rcu_dereference_rtnl(dev->rx_handler_data);
+
return br_port_exists(dev) ? port : NULL;
}