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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/core
parente5a55a898720096f43bc24938f8875c0a1b34cd7 (diff)
downloadop-kernel-dev-2469ffd723f76ac2d3ce3d4f31ee31ee0a06cd38.zip
op-kernel-dev-2469ffd723f76ac2d3ce3d4f31ee31ee0a06cd38.tar.gz
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/core')
-rw-r--r--net/core/rtnetlink.c85
1 files changed, 81 insertions, 4 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a068666..8d2af0f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2295,13 +2295,60 @@ static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
+static inline size_t bridge_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
+ + nla_total_size(sizeof(u32)) /* IFLA_MTU */
+ + nla_total_size(sizeof(u32)) /* IFLA_LINK */
+ + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
+ + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
+ + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
+ + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
+ + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
+}
+
+static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
+{
+ struct net *net = dev_net(dev);
+ struct net_device *master = dev->master;
+ struct sk_buff *skb;
+ int err = -EOPNOTSUPP;
+
+ skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
+ if (!skb) {
+ err = -ENOMEM;
+ goto errout;
+ }
+
+ if (!flags && master && master->netdev_ops->ndo_bridge_getlink)
+ err = master->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
+ else if (dev->netdev_ops->ndo_bridge_getlink)
+ err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
+
+ if (err < 0)
+ goto errout;
+
+ rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+ return 0;
+errout:
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ rtnl_set_sk_err(net, RTNLGRP_LINK, err);
+ return err;
+}
+
static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
void *arg)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
struct net_device *dev;
- int err = -EINVAL;
+ struct nlattr *br_spec, *attr = NULL;
+ int rem, err = -EOPNOTSUPP;
+ u16 flags = 0;
if (nlmsg_len(nlh) < sizeof(*ifm))
return -EINVAL;
@@ -2316,15 +2363,45 @@ static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
return -ENODEV;
}
- if (dev->master && dev->master->netdev_ops->ndo_bridge_setlink) {
+ br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
+ if (br_spec) {
+ nla_for_each_nested(attr, br_spec, rem) {
+ if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
+ flags = nla_get_u16(attr);
+ break;
+ }
+ }
+ }
+
+ if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
+ if (!dev->master ||
+ !dev->master->netdev_ops->ndo_bridge_setlink) {
+ err = -EOPNOTSUPP;
+ goto out;
+ }
+
err = dev->master->netdev_ops->ndo_bridge_setlink(dev, nlh);
if (err)
goto out;
+
+ flags &= ~BRIDGE_FLAGS_MASTER;
}
- if (dev->netdev_ops->ndo_bridge_setlink)
- err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
+ if ((flags & BRIDGE_FLAGS_SELF)) {
+ if (!dev->netdev_ops->ndo_bridge_setlink)
+ err = -EOPNOTSUPP;
+ else
+ err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
+
+ if (!err)
+ flags &= ~BRIDGE_FLAGS_SELF;
+ }
+ if (attr && nla_type(attr) == IFLA_BRIDGE_FLAGS)
+ memcpy(nla_data(attr), &flags, sizeof(flags));
+ /* Generate event to notify upper layer of bridge change */
+ if (!err)
+ err = rtnl_bridge_notify(dev, flags);
out:
return err;
}
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