[ofa-general] [PATCH 00/11] IPoIB support for bonding

[ofa-general] [PATCH 00/11] IPoIB support for bonding

[Jay Vosburgh]

	Following is patch set to provide IPoIB support for bonding in
active-backup mode.  Patches 1 - 10 were originally posted by Moni Shoua
<monis@voltaire.com>.  The changes look reasonable to me, but others (for
IB and net/core changes) probably need to ack.

	Patch 11 modifies the IB "don't copy MAC to all slaves" code in
bonding to also be optional for ethernet devices; this is occasionally
useful.

Original preface for patches 1 - 10 from Moni Shoua <monis@voltaire.com>:

This patch series is the fourth version (see below link to V3) of the 
suggested changes to the bonding driver so it would be able to support 
non ARPHRD_ETHER netdevices for its High-Availability (active-backup) mode. 

The motivation is to enable the bonding driver on its HA mode to work with
the IP over Infiniband (IPoIB) driver. With these patches I was able to
enslave IPoIB netdevices and run TCP, UDP, IP (UDP) Multicast and ICMP
traffic with fail-over and fail-back working fine. The working environment
was the net-2.6 git.

More over, as IPoIB is also the IB ARP provider for the RDMA CM driver which 
is used by native IB ULPs whose addressing scheme is based on IP (e.g. iSER, 
SDP, Lustre, NFSoRDMA, RDS), bonding support for IPoIB devices **enables** HA 
for these ULPs. This holds as when the ULP is informed by the IB HW on the 
failure of the current IB connection, it just need to reconnect, where the 
bonding device will now issue the IB ARP over the active IPoIB slave. 

This series also includes patches to the IPoIB driver that fix some fix 
some neighboring related issues. 

Major changes from the previous version:

1) Addressing the issue of safety when unloading the IPoIB module before
the bonding module
2) style changes


Links to earlier discussion: 

1. A discussion in netdev about bonding support for IPoIB.
http://lists.openwall.net/netdev/2006/11/30/46

2. A discussion in openfabrics regarding changes in the IPoIB that 
enable using it as a slave for bonding.
http://lists.openfabrics.org/pipermail/general/2007-July/038914.html

[PATCH 01/11] IB/ipoib: Export call to call_netdevice_notifiers and add new private flag

[Jay Vosburgh]

From: Moni Shoua <monisonlists@gmail.com>

Export the call to raw_notifier_call_chain so modules can send notifications
on netdev events to the netdev_chain.
Add IFF_SLAVE_DETACH to the list of priv_flags for net_device.
This flag is set by a slave that is about to unregisster from the kernel.

Both changes are used in bonding slaves that wish to inform the bonding master
about coming detachment.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 include/linux/if.h |    1 +
 net/core/dev.c     |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/if.h b/include/linux/if.h
index 32bf419..b302b22 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -61,6 +61,7 @@
 #define IFF_MASTER_ALB	0x10		/* bonding master, balance-alb.	*/
 #define IFF_BONDING	0x20		/* bonding master or slave	*/
 #define IFF_SLAVE_NEEDARP 0x40		/* need ARPs for validation	*/
+#define IFF_SLAVE_DETACH 0x80		/* slave is about to unregister */
 
 #define IF_GET_IFACE	0x0001		/* for querying only */
 #define IF_GET_PROTO	0x0002
diff --git a/net/core/dev.c b/net/core/dev.c
index a76021c..5322add 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1148,6 +1148,7 @@ int call_netdevice_notifiers(unsigned long val, void *v)
 {
 	return raw_notifier_call_chain(&netdev_chain, val, v);
 }
+EXPORT_SYMBOL(call_netdevice_notifiers);
 
 /* When > 0 there are consumers of rx skb time stamps */
 static atomic_t netstamp_needed = ATOMIC_INIT(0);
-- 
1.5.2-rc2.GIT

[ofa-general] [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

When the bonding device enslaves IPoIB devices it takes pointers to
functions in the ib_ipoib module. This is fine as long as the ib_ipoib
nodule remains loaded while the references to its functions exist.
So, to help bonding do a cleanup on time, when the IPoIB net device is a
slave of a bonding master, let the master know that the IPoIB device is
about to unregister (but before calling unregister).

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 894b1dc..97a9661 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -48,6 +48,7 @@
 #include <linux/in.h>
 
 #include <net/dst.h>
+#include <linux/netdevice.h>
 
 MODULE_AUTHOR("Roland Dreier");
 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
@@ -772,6 +773,18 @@ static void ipoib_timeout(struct net_device *dev)
 	/* XXX reset QP, etc. */
 }
 
+static int ipoib_slave_detach(struct net_device *dev)
+{
+	int ret = 0;
+	if (dev->flags & IFF_SLAVE) {
+		dev->priv_flags |= IFF_SLAVE_DETACH;
+		rtnl_lock();
+		ret = call_netdevice_notifiers(NETDEV_CHANGE, dev);
+		rtnl_unlock();
+	}
+	return ret;
+}
+
 static int ipoib_hard_header(struct sk_buff *skb,
 			     struct net_device *dev,
 			     unsigned short type,
@@ -921,6 +934,7 @@ void ipoib_dev_cleanup(struct net_device *dev)
 
 	/* Delete any child interfaces first */
 	list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
+		ipoib_slave_detach(cpriv->dev);
 		unregister_netdev(cpriv->dev);
 		ipoib_dev_cleanup(cpriv->dev);
 		free_netdev(cpriv->dev);
@@ -1208,6 +1222,7 @@ static void ipoib_remove_one(struct ib_device *device)
 		ib_unregister_event_handler(&priv->event_handler);
 		flush_scheduled_work();
 
+		ipoib_slave_detach(priv->dev);
 		unregister_netdev(priv->dev);
 		ipoib_dev_cleanup(priv->dev);
 		free_netdev(priv->dev);
-- 
1.5.2-rc2.GIT

[PATCH 03/11] IB/ipoib: Bound the net device to the ipoib_neigh structue

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

IPoIB uses a two layer neighboring scheme, such that for each struct neighbour
whose device is an ipoib one, there is a struct ipoib_neigh buddy which is
created on demand at the tx flow by an ipoib_neigh_alloc(skb->dst->neighbour)
call.

When using the bonding driver, neighbours are created by the net stack on behalf
of the bonding (master) device. On the tx flow the bonding code gets an skb such
that skb->dev points to the master device, it changes this skb to point on the
slave device and calls the slave hard_start_xmit function.

Under this scheme, ipoib_neigh_destructor assumption that for each struct
neighbour it gets, n->dev is an ipoib device and hence netdev_priv(n->dev)
can be casted to struct ipoib_dev_priv is buggy.

To fix it, this patch adds a dev field to struct ipoib_neigh which is used
instead of the struct neighbour dev one, when n->dev->flags has the
IFF_MASTER bit set.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/infiniband/ulp/ipoib/ipoib.h           |    4 +++-
 drivers/infiniband/ulp/ipoib/ipoib_main.c      |   17 +++++++++++++++--
 drivers/infiniband/ulp/ipoib/ipoib_multicast.c |    3 ++-
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 285c143..a13730c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -328,6 +328,7 @@ struct ipoib_neigh {
 	struct sk_buff_head queue;
 
 	struct neighbour   *neighbour;
+	struct net_device *dev;
 
 	struct list_head    list;
 };
@@ -344,7 +345,8 @@ static inline struct ipoib_neigh **to_ipoib_neigh(struct neighbour *neigh)
 				     INFINIBAND_ALEN, sizeof(void *));
 }
 
-struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh);
+struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh,
+				      struct net_device *dev);
 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh);
 
 extern struct workqueue_struct *ipoib_workqueue;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 97a9661..cb26cfd 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -511,7 +511,7 @@ static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 	struct ipoib_path *path;
 	struct ipoib_neigh *neigh;
 
-	neigh = ipoib_neigh_alloc(skb->dst->neighbour);
+	neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 	if (!neigh) {
 		++priv->stats.tx_dropped;
 		dev_kfree_skb_any(skb);
@@ -830,6 +830,17 @@ static void ipoib_neigh_cleanup(struct neighbour *n)
 	unsigned long flags;
 	struct ipoib_ah *ah = NULL;
 
+	if (n->dev->flags & IFF_MASTER) {
+		/* n->dev is not an IPoIB device and we have
+			to take priv from elsewhere */
+		neigh = *to_ipoib_neigh(n);
+		if (neigh) {
+			priv = netdev_priv(neigh->dev);
+			ipoib_dbg(priv, "neigh_destructor for bonding device: %s\n",
+				  n->dev->name);
+		} else
+			return;
+	}
 	ipoib_dbg(priv,
 		  "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 		  IPOIB_QPN(n->ha),
@@ -851,7 +862,8 @@ static void ipoib_neigh_cleanup(struct neighbour *n)
 		ipoib_put_ah(ah);
 }
 
-struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
+struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
+				      struct net_device *dev)
 {
 	struct ipoib_neigh *neigh;
 
@@ -860,6 +872,7 @@ struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
 		return NULL;
 
 	neigh->neighbour = neighbour;
+	neigh->dev = dev;
 	*to_ipoib_neigh(neighbour) = neigh;
 	skb_queue_head_init(&neigh->queue);
 	ipoib_cm_set(neigh, NULL);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index aae3670..ed0f0bb 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -727,7 +727,8 @@ out:
 		if (skb->dst            &&
 		    skb->dst->neighbour &&
 		    !*to_ipoib_neigh(skb->dst->neighbour)) {
-			struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
+			struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
+									skb->dev);
 
 			if (neigh) {
 				kref_get(&mcast->ah->ref);
-- 
1.5.2-rc2.GIT

[PATCH 04/11] IB/ipoib: Verify address handle validity on send

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

When the bonding device senses a carrier loss of its active slave it replaces
that slave with a new one. In between the times when the carrier of an IPoIB
device goes down and ipoib_neigh is destroyed, it is possible that the
bonding driver will send a packet on a new slave that uses an old ipoib_neigh.
This patch detects and prevents this from happenning.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index cb26cfd..6c4e9fb 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -686,9 +686,10 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 				goto out;
 			}
 		} else if (neigh->ah) {
-			if (unlikely(memcmp(&neigh->dgid.raw,
+			if (unlikely((memcmp(&neigh->dgid.raw,
 					    skb->dst->neighbour->ha + 4,
-					    sizeof(union ib_gid)))) {
+					    sizeof(union ib_gid))) ||
+						 (neigh->dev != dev))) {
 				spin_lock(&priv->lock);
 				/*
 				 * It's safe to call ipoib_put_ah() inside
-- 
1.5.2-rc2.GIT

[PATCH 05/11] net/bonding: Enable bonding to enslave non ARPHRD_ETHER

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

This patch changes some of the bond netdevice attributes and functions
to be that of the active slave for the case of the enslaved device not being
of ARPHRD_ETHER type. Basically it overrides those setting done by ether_setup(),
which are netdevice **type** dependent and hence might be not appropriate for
devices of other types. It also enforces mutual exclusion on bonding slaves
from dissimilar ether types, as was concluded over the v1 discussion.

IPoIB (see Documentation/infiniband/ipoib.txt) MAC address is made of a 3 bytes
IB QP (Queue Pair) number and 16 bytes IB port GID (Global ID) of the port this
IPoIB device is bounded to. The QP is a resource created by the IB HW and the
GID is an identifier burned into the HCA (i have omitted here some details which
are not important for the bonding RFC).

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 1afda32..13ec73d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1237,6 +1237,26 @@ static int bond_compute_features(struct bonding *bond)
 	return 0;
 }
 
+
+static void bond_setup_by_slave(struct net_device *bond_dev,
+				struct net_device *slave_dev)
+{
+	bond_dev->hard_header	        = slave_dev->hard_header;
+	bond_dev->rebuild_header        = slave_dev->rebuild_header;
+	bond_dev->hard_header_cache	= slave_dev->hard_header_cache;
+	bond_dev->header_cache_update   = slave_dev->header_cache_update;
+	bond_dev->hard_header_parse	= slave_dev->hard_header_parse;
+
+	bond_dev->neigh_setup           = slave_dev->neigh_setup;
+
+	bond_dev->type		    = slave_dev->type;
+	bond_dev->hard_header_len   = slave_dev->hard_header_len;
+	bond_dev->addr_len	    = slave_dev->addr_len;
+
+	memcpy(bond_dev->broadcast, slave_dev->broadcast,
+		slave_dev->addr_len);
+}
+
 /* enslave device <slave> to bond device <master> */
 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 {
@@ -1311,6 +1331,25 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		goto err_undo_flags;
 	}
 
+	/* set bonding device ether type by slave - bonding netdevices are
+	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
+	 * there is a need to override some of the type dependent attribs/funcs.
+	 *
+	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
+	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
+	 */
+	if (bond->slave_cnt == 0) {
+		if (slave_dev->type != ARPHRD_ETHER)
+			bond_setup_by_slave(bond_dev, slave_dev);
+	} else if (bond_dev->type != slave_dev->type) {
+		printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
+			"from other slaves (%d), can not enslave it.\n",
+			slave_dev->name,
+			slave_dev->type, bond_dev->type);
+			res = -EINVAL;
+			goto err_undo_flags;
+	}
+
 	if (slave_dev->set_mac_address == NULL) {
 		printk(KERN_ERR DRV_NAME
 			": %s: Error: The slave device you specified does "
-- 
1.5.2-rc2.GIT

[PATCH 06/11] net/bonding: Enable bonding to enslave netdevices not supporting set_mac_address()

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

This patch allows for enslaving netdevices which do not support
the set_mac_address() function. In that case the bond mac address is the one
of the active slave, where remote peers are notified on the mac address
(neighbour) change by Gratuitous ARP sent by bonding when fail-over occurs
(this is already done by the bonding code).

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c |   87 ++++++++++++++++++++++++++------------
 drivers/net/bonding/bonding.h   |    1 +
 2 files changed, 60 insertions(+), 28 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 13ec73d..d937bae 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1095,6 +1095,14 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 		if (new_active) {
 			bond_set_slave_active_flags(new_active);
 		}
+
+		/* when bonding does not set the slave MAC address, the bond MAC
+		 * address is the one of the active slave.
+		 */
+		if (new_active && !bond->do_set_mac_addr)
+			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
+				new_active->dev->addr_len);
+
 		bond_send_gratuitous_arp(bond);
 	}
 }
@@ -1351,13 +1359,22 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	}
 
 	if (slave_dev->set_mac_address == NULL) {
-		printk(KERN_ERR DRV_NAME
-			": %s: Error: The slave device you specified does "
-			"not support setting the MAC address. "
-			"Your kernel likely does not support slave "
-			"devices.\n", bond_dev->name);
-  		res = -EOPNOTSUPP;
-		goto err_undo_flags;
+		if (bond->slave_cnt == 0) {
+			printk(KERN_WARNING DRV_NAME
+				": %s: Warning: The first slave device you "
+				"specified does not support setting the MAC "
+				"address. This bond MAC address would be that "
+				"of the active slave.\n", bond_dev->name);
+			bond->do_set_mac_addr = 0;
+		} else if (bond->do_set_mac_addr) {
+			printk(KERN_ERR DRV_NAME
+				": %s: Error: The slave device you specified "
+				"does not support setting the MAC addres,."
+				"but this bond uses this practice. \n"
+				, bond_dev->name);
+			res = -EOPNOTSUPP;
+			goto err_undo_flags;
+		}
 	}
 
 	new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
@@ -1378,16 +1395,18 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	 */
 	memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
 
-	/*
-	 * Set slave to master's mac address.  The application already
-	 * set the master's mac address to that of the first slave
-	 */
-	memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
-	addr.sa_family = slave_dev->type;
-	res = dev_set_mac_address(slave_dev, &addr);
-	if (res) {
-		dprintk("Error %d calling set_mac_address\n", res);
-		goto err_free;
+	if (bond->do_set_mac_addr) {
+		/*
+		 * Set slave to master's mac address.  The application already
+		 * set the master's mac address to that of the first slave
+		 */
+		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
+		addr.sa_family = slave_dev->type;
+		res = dev_set_mac_address(slave_dev, &addr);
+		if (res) {
+			dprintk("Error %d calling set_mac_address\n", res);
+			goto err_free;
+		}
 	}
 
 	res = netdev_set_master(slave_dev, bond_dev);
@@ -1612,9 +1631,11 @@ err_close:
 	dev_close(slave_dev);
 
 err_restore_mac:
-	memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
-	addr.sa_family = slave_dev->type;
-	dev_set_mac_address(slave_dev, &addr);
+	if (bond->do_set_mac_addr) {
+		memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
+		addr.sa_family = slave_dev->type;
+		dev_set_mac_address(slave_dev, &addr);
+	}
 
 err_free:
 	kfree(new_slave);
@@ -1792,10 +1813,12 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 	/* close slave before restoring its mac address */
 	dev_close(slave_dev);
 
-	/* restore original ("permanent") mac address */
-	memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
-	addr.sa_family = slave_dev->type;
-	dev_set_mac_address(slave_dev, &addr);
+	if (bond->do_set_mac_addr) {
+		/* restore original ("permanent") mac address */
+		memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
+		addr.sa_family = slave_dev->type;
+		dev_set_mac_address(slave_dev, &addr);
+	}
 
 	slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
 				   IFF_SLAVE_INACTIVE | IFF_BONDING |
@@ -1882,10 +1905,12 @@ static int bond_release_all(struct net_device *bond_dev)
 		/* close slave before restoring its mac address */
 		dev_close(slave_dev);
 
-		/* restore original ("permanent") mac address*/
-		memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
-		addr.sa_family = slave_dev->type;
-		dev_set_mac_address(slave_dev, &addr);
+		if (bond->do_set_mac_addr) {
+			/* restore original ("permanent") mac address*/
+			memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
+			addr.sa_family = slave_dev->type;
+			dev_set_mac_address(slave_dev, &addr);
+		}
 
 		slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
 					   IFF_SLAVE_INACTIVE);
@@ -3922,6 +3947,9 @@ static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
 
 	dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
 
+	if (!bond->do_set_mac_addr)
+		return -EOPNOTSUPP;
+
 	if (!is_valid_ether_addr(sa->sa_data)) {
 		return -EADDRNOTAVAIL;
 	}
@@ -4312,6 +4340,9 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
 	bond_create_proc_entry(bond);
 #endif
 
+	/* set do_set_mac_addr to true on startup */
+	bond->do_set_mac_addr = 1;
+
 	list_add_tail(&bond->bond_list, &bond_dev_list);
 
 	return 0;
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 6dcbd25..700d40a 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -185,6 +185,7 @@ struct bonding {
 	struct   timer_list mii_timer;
 	struct   timer_list arp_timer;
 	s8       kill_timers;
+	s8       do_set_mac_addr;
 	struct   net_device_stats stats;
 #ifdef CONFIG_PROC_FS
 	struct   proc_dir_entry *proc_entry;
-- 
1.5.2-rc2.GIT

[PATCH 07/11] net/bonding: Enable IP multicast for bonding IPoIB devices

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

Allow to enslave devices when the bonding device is not up. Over the discussion
held at the previous post this seemed to be the most clean way to go, where it
is not expected to cause instabilities.

Normally, the bonding driver is UP before any enslavement takes place.
Once a netdevice is UP, the network stack acts to have it join some multicast groups
(eg the all-hosts 224.0.0.1). Now, since ether_setup() have set the bonding device
type to be ARPHRD_ETHER and address len to be ETHER_ALEN, the net core code
computes a wrong multicast link address. This is b/c ip_eth_mc_map() is called
where for multicast joins taking place after the enslavement another ip_xxx_mc_map()
is called (eg ip_ib_mc_map() when the bond type is ARPHRD_INFINIBAND)

Signed-off-by: Moni Shoua <monis@voltaire.com>
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c  |    5 +++--
 drivers/net/bonding/bond_sysfs.c |    6 ++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index d937bae..a1fe87a 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1285,8 +1285,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 
 	/* bond must be initialized by bond_open() before enslaving */
 	if (!(bond_dev->flags & IFF_UP)) {
-		dprintk("Error, master_dev is not up\n");
-		return -EPERM;
+		printk(KERN_WARNING DRV_NAME
+			" %s: master_dev is not up in bond_enslave\n",
+			bond_dev->name);
 	}
 
 	/* already enslaved */
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 9afd172..073841f 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -265,11 +265,9 @@ static ssize_t bonding_store_slaves(struct device *d,
 
 	/* Quick sanity check -- is the bond interface up? */
 	if (!(bond->dev->flags & IFF_UP)) {
-		printk(KERN_ERR DRV_NAME
-		       ": %s: Unable to update slaves because interface is down.\n",
+		printk(KERN_WARNING DRV_NAME
+		       ": %s: doing slave updates when interface is down.\n",
 		       bond->dev->name);
-		ret = -EPERM;
-		goto out;
 	}
 
 	/* Note:  We can't hold bond->lock here, as bond_create grabs it. */
-- 
1.5.2-rc2.GIT

[PATCH 08/11] net/bonding: Handle wrong assumptions that slave is always an Ethernet device

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

bonding sometimes uses Ethernet constants (such as MTU and address length) which
are not good when it enslaves non Ethernet devices (such as InfiniBand).

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c  |    3 ++-
 drivers/net/bonding/bond_sysfs.c |   19 +++++++++++++------
 drivers/net/bonding/bonding.h    |    1 +
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a1fe87a..9ff2cf6 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1224,7 +1224,8 @@ static int bond_compute_features(struct bonding *bond)
 	struct slave *slave;
 	struct net_device *bond_dev = bond->dev;
 	unsigned long features = bond_dev->features;
-	unsigned short max_hard_header_len = ETH_HLEN;
+	unsigned short max_hard_header_len = max((u16)ETH_HLEN,
+						bond_dev->hard_header_len);
 	int i;
 
 	features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 073841f..71db5d9 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -163,9 +163,7 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 				printk(KERN_INFO DRV_NAME
 					": %s is being deleted...\n",
 					bond->dev->name);
-				bond_deinit(bond->dev);
-		        	bond_destroy_sysfs_entry(bond);
-				unregister_netdevice(bond->dev);
+				bond_destroy(bond);
 				rtnl_unlock();
 				goto out;
 			}
@@ -259,6 +257,7 @@ static ssize_t bonding_store_slaves(struct device *d,
 	char command[IFNAMSIZ + 1] = { 0, };
 	char *ifname;
 	int i, res, found, ret = count;
+	u32 original_mtu;
 	struct slave *slave;
 	struct net_device *dev = NULL;
 	struct bonding *bond = to_bond(d);
@@ -324,6 +323,7 @@ static ssize_t bonding_store_slaves(struct device *d,
 		}
 
 		/* Set the slave's MTU to match the bond */
+		original_mtu = dev->mtu;
 		if (dev->mtu != bond->dev->mtu) {
 			if (dev->change_mtu) {
 				res = dev->change_mtu(dev,
@@ -338,6 +338,9 @@ static ssize_t bonding_store_slaves(struct device *d,
 		}
 		rtnl_lock();
 		res = bond_enslave(bond->dev, dev);
+		bond_for_each_slave(bond, slave, i)
+			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
+				slave->original_mtu = original_mtu;
 		rtnl_unlock();
 		if (res) {
 			ret = res;
@@ -350,13 +353,17 @@ static ssize_t bonding_store_slaves(struct device *d,
 		bond_for_each_slave(bond, slave, i)
 			if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 				dev = slave->dev;
+				original_mtu = slave->original_mtu;
 				break;
 			}
 		if (dev) {
 			printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
 				bond->dev->name, dev->name);
 			rtnl_lock();
-			res = bond_release(bond->dev, dev);
+			if (bond->setup_by_slave)
+				res = bond_release_and_destroy(bond->dev, dev);
+			else
+				res = bond_release(bond->dev, dev);
 			rtnl_unlock();
 			if (res) {
 				ret = res;
@@ -364,9 +371,9 @@ static ssize_t bonding_store_slaves(struct device *d,
 			}
 			/* set the slave MTU to the default */
 			if (dev->change_mtu) {
-				dev->change_mtu(dev, 1500);
+				dev->change_mtu(dev, original_mtu);
 			} else {
-				dev->mtu = 1500;
+				dev->mtu = original_mtu;
 			}
 		}
 		else {
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 700d40a..b7b4f4a 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -156,6 +156,7 @@ struct slave {
 	s8     link;    /* one of BOND_LINK_XXXX */
 	s8     state;   /* one of BOND_STATE_XXXX */
 	u32    original_flags;
+	u32    original_mtu;
 	u32    link_failure_count;
 	u16    speed;
 	u8     duplex;
-- 
1.5.2-rc2.GIT

[PATCH 9/11] net/bonding: Delay sending of gratuitous ARP to avoid failure

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

Delay sending a gratuitous_arp when LINK_STATE_LINKWATCH_PENDING bit
in dev->state field is on. This improves the chances for the arp packet to
be transmitted.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c |   24 +++++++++++++++++++++---
 drivers/net/bonding/bonding.h   |    1 +
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 9ff2cf6..dfbfb00 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1102,8 +1102,14 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 		if (new_active && !bond->do_set_mac_addr)
 			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 				new_active->dev->addr_len);
-
-		bond_send_gratuitous_arp(bond);
+		if (bond->curr_active_slave &&
+			test_bit(__LINK_STATE_LINKWATCH_PENDING,
+					&bond->curr_active_slave->dev->state)) {
+			dprintk("delaying gratuitous arp on %s\n",
+				bond->curr_active_slave->dev->name);
+			bond->send_grat_arp = 1;
+		} else
+			bond_send_gratuitous_arp(bond);
 	}
 }
 
@@ -2083,6 +2089,17 @@ void bond_mii_monitor(struct net_device *bond_dev)
 	 * program could monitor the link itself if needed.
 	 */
 
+	if (bond->send_grat_arp) {
+		if (bond->curr_active_slave && test_bit(__LINK_STATE_LINKWATCH_PENDING,
+				&bond->curr_active_slave->dev->state))
+			dprintk("Needs to send gratuitous arp but not yet\n");
+		else {
+			dprintk("sending delayed gratuitous arp on on %s\n",
+				bond->curr_active_slave->dev->name);
+			bond_send_gratuitous_arp(bond);
+			bond->send_grat_arp = 0;
+		}
+	}
 	read_lock(&bond->curr_slave_lock);
 	oldcurrent = bond->curr_active_slave;
 	read_unlock(&bond->curr_slave_lock);
@@ -2484,7 +2501,7 @@ static void bond_send_gratuitous_arp(struct bonding *bond)
 
 	if (bond->master_ip) {
 		bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
-				  bond->master_ip, 0);
+				bond->master_ip, 0);
 	}
 
 	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
@@ -4293,6 +4310,7 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
 	bond->current_arp_slave = NULL;
 	bond->primary_slave = NULL;
 	bond->dev = bond_dev;
+	bond->send_grat_arp = 0;
 	INIT_LIST_HEAD(&bond->vlan_list);
 
 	/* Initialize the device entry points */
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index b7b4f4a..b1cdb1f 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -187,6 +187,7 @@ struct bonding {
 	struct   timer_list arp_timer;
 	s8       kill_timers;
 	s8       do_set_mac_addr;
+	s8	 send_grat_arp;
 	struct   net_device_stats stats;
 #ifdef CONFIG_PROC_FS
 	struct   proc_dir_entry *proc_entry;
-- 
1.5.2-rc2.GIT

[PATCH 10/11] net/bonding: Destroy bonding master when last slave is gone

[Jay Vosburgh]

From: Moni Shoua <monis@voltaire.com>

When bonding enslaves non Ethernet devices it takes pointers to functions
in the module that owns the slaves. In this case it becomes unsafe
to keep the bonding master registered after last slave was unenslaved
because we don't know if the pointers are still valid.  Destroying the bond when slave_cnt is zero
ensures that these functions be used anymore.

Signed-off-by: Moni Shoua <monis@voltaire.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
---
 drivers/net/bonding/bond_main.c |   45 ++++++++++++++++++++++++++++++++++++++-
 drivers/net/bonding/bonding.h   |    3 ++
 2 files changed, 47 insertions(+), 1 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index dfbfb00..77caca3 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1256,6 +1256,7 @@ static int bond_compute_features(struct bonding *bond)
 static void bond_setup_by_slave(struct net_device *bond_dev,
 				struct net_device *slave_dev)
 {
+	struct bonding *bond = bond_dev->priv;
 	bond_dev->hard_header	        = slave_dev->hard_header;
 	bond_dev->rebuild_header        = slave_dev->rebuild_header;
 	bond_dev->hard_header_cache	= slave_dev->hard_header_cache;
@@ -1270,6 +1271,7 @@ static void bond_setup_by_slave(struct net_device *bond_dev,
 
 	memcpy(bond_dev->broadcast, slave_dev->broadcast,
 		slave_dev->addr_len);
+	bond->setup_by_slave = 1;
 }
 
 /* enslave device <slave> to bond device <master> */
@@ -1838,6 +1840,35 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 }
 
 /*
+* Destroy a bonding device.
+* Must be under rtnl_lock when this function is called.
+*/
+void bond_destroy(struct bonding *bond)
+{
+	bond_deinit(bond->dev);
+	bond_destroy_sysfs_entry(bond);
+	unregister_netdevice(bond->dev);
+}
+
+/*
+* First release a slave and than destroy the bond if no more slaves iare left.
+* Must be under rtnl_lock when this function is called.
+*/
+int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
+{
+	struct bonding *bond = bond_dev->priv;
+	int ret;
+
+	ret = bond_release(bond_dev, slave_dev);
+	if ((ret == 0) && (bond->slave_cnt == 0)) {
+		printk(KERN_INFO DRV_NAME " %s: destroying bond for.\n",
+					bond_dev->name);
+		bond_destroy(bond);
+	}
+	return ret;
+}
+
+/*
  * This function releases all slaves.
  */
 static int bond_release_all(struct net_device *bond_dev)
@@ -3322,7 +3353,11 @@ static int bond_slave_netdev_event(unsigned long event, struct net_device *slave
 	switch (event) {
 	case NETDEV_UNREGISTER:
 		if (bond_dev) {
-			bond_release(bond_dev, slave_dev);
+			dprintk("slave %s unregisters\n", slave_dev->name);
+			if (bond->setup_by_slave)
+				bond_release_and_destroy(bond_dev, slave_dev);
+			else
+				bond_release(bond_dev, slave_dev);
 		}
 		break;
 	case NETDEV_CHANGE:
@@ -3331,6 +3366,13 @@ static int bond_slave_netdev_event(unsigned long event, struct net_device *slave
 		 * sets up a hierarchical bond, then rmmod's
 		 * one of the slave bonding devices?
 		 */
+		if (slave_dev->priv_flags & IFF_SLAVE_DETACH) {
+			dprintk("slave %s detaching\n", slave_dev->name);
+			if (bond->setup_by_slave)
+				bond_release_and_destroy(bond_dev, slave_dev);
+			else
+				bond_release(bond_dev, slave_dev);
+		}
 		break;
 	case NETDEV_DOWN:
 		/*
@@ -4311,6 +4353,7 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
 	bond->primary_slave = NULL;
 	bond->dev = bond_dev;
 	bond->send_grat_arp = 0;
+	bond->setup_by_slave = 0;
 	INIT_LIST_HEAD(&bond->vlan_list);
 
 	/* Initialize the device entry points */
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index b1cdb1f..ed0f587 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -188,6 +188,7 @@ struct bonding {
 	s8       kill_timers;
 	s8       do_set_mac_addr;
 	s8	 send_grat_arp;
+	s8	 setup_by_slave;
 	struct   net_device_stats stats;
 #ifdef CONFIG_PROC_FS
 	struct   proc_dir_entry *proc_entry;
@@ -295,6 +296,8 @@ static inline void bond_unset_master_alb_flags(struct bonding *bond)
 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 int bond_create(char *name, struct bond_params *params, struct bonding **newbond);
+void bond_destroy(struct bonding *bond);
+int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev);
 void bond_deinit(struct net_device *bond_dev);
 int bond_create_sysfs(void);
 void bond_destroy_sysfs(void);
-- 
1.5.2-rc2.GIT

[PATCH 11/11] bonding: Optionally allow ethernet slaves to keep own MAC

[Jay Vosburgh]

 	Update the "don't change MAC of slaves" functionality added in
previous changes to be a generic option, rather than something tied to IB
devices, as it's occasionally useful for regular ethernet devices as well.

	Adds "fail_over_mac" option (which is automatically enabled for IB
slaves), applicable only to active-backup mode.

	Includes documentation update.

	Updates bonding driver version to 3.2.0.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
---
 Documentation/networking/bonding.txt |   33 +++++++++++++++++++
 drivers/net/bonding/bond_main.c      |   57 +++++++++++++++++++++------------
 drivers/net/bonding/bond_sysfs.c     |   49 +++++++++++++++++++++++++++++
 drivers/net/bonding/bonding.h        |    6 ++--
 4 files changed, 121 insertions(+), 24 deletions(-)

diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index 1da5666..1134062 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -281,6 +281,39 @@ downdelay
 	will be rounded down to the nearest multiple.  The default
 	value is 0.
 
+fail_over_mac
+
+	Specifies whether active-backup mode should set all slaves to
+	the same MAC address (the traditional behavior), or, when
+	enabled, change the bond's MAC address when changing the
+	active interface (i.e., fail over the MAC address itself).
+
+	Fail over MAC is useful for devices that cannot ever alter
+	their MAC address, or for devices that refuse incoming
+	broadcasts with their own source MAC (which interferes with
+	the ARP monitor).
+
+	The down side of fail over MAC is that every device on the
+	network must be updated via gratuitous ARP, vs. just updating
+	a switch or set of switches (which often takes place for any
+	traffic, not just ARP traffic, if the switch snoops incoming
+	traffic to update its tables) for the traditional method.  If
+	the gratuitous ARP is lost, communication may be disrupted.
+
+	When fail over MAC is used in conjuction with the mii monitor,
+	devices which assert link up prior to being able to actually
+	transmit and receive are particularly susecptible to loss of
+	the gratuitous ARP, and an appropriate updelay setting may be
+	required.
+
+	A value of 0 disables fail over MAC, and is the default.  A
+	value of 1 enables fail over MAC.  This option is enabled
+	automatically if the first slave added cannot change its MAC
+	address.  This option may be modified via sysfs only when no
+	slaves are present in the bond.
+
+	This option was added in bonding version 3.2.0.
+
 lacp_rate
 
 	Option specifying the rate in which we'll ask our link partner
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 77caca3..c01ff9d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -97,6 +97,7 @@ static char *xmit_hash_policy = NULL;
 static int arp_interval = BOND_LINK_ARP_INTERV;
 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
 static char *arp_validate = NULL;
+static int fail_over_mac = 0;
 struct bond_params bonding_defaults;
 
 module_param(max_bonds, int, 0);
@@ -130,6 +131,8 @@ module_param_array(arp_ip_target, charp, NULL, 0);
 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 module_param(arp_validate, charp, 0);
 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
+module_param(fail_over_mac, int, 0);
+MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  0 of off (default), 1 for on.");
 
 /*----------------------------- Global variables ----------------------------*/
 
@@ -1099,7 +1102,7 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 		/* when bonding does not set the slave MAC address, the bond MAC
 		 * address is the one of the active slave.
 		 */
-		if (new_active && !bond->do_set_mac_addr)
+		if (new_active && bond->params.fail_over_mac)
 			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 				new_active->dev->addr_len);
 		if (bond->curr_active_slave &&
@@ -1371,16 +1374,16 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	if (slave_dev->set_mac_address == NULL) {
 		if (bond->slave_cnt == 0) {
 			printk(KERN_WARNING DRV_NAME
-				": %s: Warning: The first slave device you "
-				"specified does not support setting the MAC "
-				"address. This bond MAC address would be that "
-				"of the active slave.\n", bond_dev->name);
-			bond->do_set_mac_addr = 0;
-		} else if (bond->do_set_mac_addr) {
+			       ": %s: Warning: The first slave device "
+			       "specified does not support setting the MAC "
+			       "address. Enabling the fail_over_mac option.",
+			       bond_dev->name);
+			bond->params.fail_over_mac = 1;
+		} else if (!bond->params.fail_over_mac) {
 			printk(KERN_ERR DRV_NAME
-				": %s: Error: The slave device you specified "
-				"does not support setting the MAC addres,."
-				"but this bond uses this practice. \n"
+				": %s: Error: The slave device specified "
+				"does not support setting the MAC address, "
+				"but fail_over_mac is not enabled.\n"
 				, bond_dev->name);
 			res = -EOPNOTSUPP;
 			goto err_undo_flags;
@@ -1405,7 +1408,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	 */
 	memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
 
-	if (bond->do_set_mac_addr) {
+	if (!bond->params.fail_over_mac) {
 		/*
 		 * Set slave to master's mac address.  The application already
 		 * set the master's mac address to that of the first slave
@@ -1641,7 +1644,7 @@ err_close:
 	dev_close(slave_dev);
 
 err_restore_mac:
-	if (bond->do_set_mac_addr) {
+	if (!bond->params.fail_over_mac) {
 		memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
 		addr.sa_family = slave_dev->type;
 		dev_set_mac_address(slave_dev, &addr);
@@ -1823,7 +1826,7 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 	/* close slave before restoring its mac address */
 	dev_close(slave_dev);
 
-	if (bond->do_set_mac_addr) {
+	if (!bond->params.fail_over_mac) {
 		/* restore original ("permanent") mac address */
 		memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
 		addr.sa_family = slave_dev->type;
@@ -1944,7 +1947,7 @@ static int bond_release_all(struct net_device *bond_dev)
 		/* close slave before restoring its mac address */
 		dev_close(slave_dev);
 
-		if (bond->do_set_mac_addr) {
+		if (!bond->params.fail_over_mac) {
 			/* restore original ("permanent") mac address*/
 			memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
 			addr.sa_family = slave_dev->type;
@@ -3066,9 +3069,15 @@ static void bond_info_show_master(struct seq_file *seq)
 	curr = bond->curr_active_slave;
 	read_unlock(&bond->curr_slave_lock);
 
-	seq_printf(seq, "Bonding Mode: %s\n",
+	seq_printf(seq, "Bonding Mode: %s",
 		   bond_mode_name(bond->params.mode));
 
+	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
+	    bond->params.fail_over_mac)
+		seq_printf(seq, " (fail_over_mac)");
+
+	seq_printf(seq, "\n");
+
 	if (bond->params.mode == BOND_MODE_XOR ||
 		bond->params.mode == BOND_MODE_8023AD) {
 		seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
@@ -4008,8 +4017,12 @@ static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
 
 	dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
 
-	if (!bond->do_set_mac_addr)
-		return -EOPNOTSUPP;
+	/*
+	 * If fail_over_mac is enabled, do nothing and return success.
+	 * Returning an error causes ifenslave to fail.
+	 */
+	if (bond->params.fail_over_mac)
+		return 0;
 
 	if (!is_valid_ether_addr(sa->sa_data)) {
 		return -EADDRNOTAVAIL;
@@ -4402,10 +4415,6 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
 #ifdef CONFIG_PROC_FS
 	bond_create_proc_entry(bond);
 #endif
-
-	/* set do_set_mac_addr to true on startup */
-	bond->do_set_mac_addr = 1;
-
 	list_add_tail(&bond->bond_list, &bond_dev_list);
 
 	return 0;
@@ -4739,6 +4748,11 @@ static int bond_check_params(struct bond_params *params)
 		primary = NULL;
 	}
 
+	if (fail_over_mac && (bond_mode != BOND_MODE_ACTIVEBACKUP))
+		printk(KERN_WARNING DRV_NAME
+		       ": Warning: fail_over_mac only affects "
+		       "active-backup mode.\n");
+
 	/* fill params struct with the proper values */
 	params->mode = bond_mode;
 	params->xmit_policy = xmit_hashtype;
@@ -4750,6 +4764,7 @@ static int bond_check_params(struct bond_params *params)
 	params->use_carrier = use_carrier;
 	params->lacp_fast = lacp_fast;
 	params->primary[0] = 0;
+	params->fail_over_mac = fail_over_mac;
 
 	if (primary) {
 		strncpy(params->primary, primary, IFNAMSIZ);
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 71db5d9..a907b68 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -567,6 +567,54 @@ static ssize_t bonding_store_arp_validate(struct device *d,
 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
 
 /*
+ * Show and store fail_over_mac.  User only allowed to change the
+ * value when there are no slaves.
+ */
+static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
+{
+	struct bonding *bond = to_bond(d);
+
+	return sprintf(buf, "%d\n", bond->params.fail_over_mac) + 1;
+}
+
+static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
+{
+	int new_value;
+	int ret = count;
+	struct bonding *bond = to_bond(d);
+
+	if (bond->slave_cnt != 0) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: Can't alter fail_over_mac with slaves in bond.\n",
+		       bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (sscanf(buf, "%d", &new_value) != 1) {
+		printk(KERN_ERR DRV_NAME
+		       ": %s: no fail_over_mac value specified.\n",
+		       bond->dev->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if ((new_value == 0) || (new_value == 1)) {
+		bond->params.fail_over_mac = new_value;
+		printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %d.\n",
+		       bond->dev->name, new_value);
+	} else {
+		printk(KERN_INFO DRV_NAME
+		       ": %s: Ignoring invalid fail_over_mac value %d.\n",
+		       bond->dev->name, new_value);
+	}
+out:
+	return ret;
+}
+
+static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
+
+/*
  * Show and set the arp timer interval.  There are two tricky bits
  * here.  First, if ARP monitoring is activated, then we must disable
  * MII monitoring.  Second, if the ARP timer isn't running, we must
@@ -1390,6 +1438,7 @@ static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
 static struct attribute *per_bond_attrs[] = {
 	&dev_attr_slaves.attr,
 	&dev_attr_mode.attr,
+	&dev_attr_fail_over_mac.attr,
 	&dev_attr_arp_validate.attr,
 	&dev_attr_arp_interval.attr,
 	&dev_attr_arp_ip_target.attr,
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index ed0f587..9d6153e 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -22,8 +22,8 @@
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
-#define DRV_VERSION	"3.1.3"
-#define DRV_RELDATE	"June 13, 2007"
+#define DRV_VERSION	"3.2.0"
+#define DRV_RELDATE	"September 13, 2007"
 #define DRV_NAME	"bonding"
 #define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"
 
@@ -128,6 +128,7 @@ struct bond_params {
 	int arp_interval;
 	int arp_validate;
 	int use_carrier;
+	int fail_over_mac;
 	int updelay;
 	int downdelay;
 	int lacp_fast;
@@ -186,7 +187,6 @@ struct bonding {
 	struct   timer_list mii_timer;
 	struct   timer_list arp_timer;
 	s8       kill_timers;
-	s8       do_set_mac_addr;
 	s8	 send_grat_arp;
 	s8	 setup_by_slave;
 	struct   net_device_stats stats;
-- 
1.5.2-rc2.GIT

[ofa-general] Re: [PATCH 01/11] IB/ipoib: Export call to call_netdevice_notifiers and add new private flag

[Roland Dreier]

I tried to look at the ipoib stuff in this series... this patch looks
fine but it doesn't actually touch ipoib, so the subject line is a bit
misleading...

Re: [PATCH 04/11] IB/ipoib: Verify address handle validity on send

[Roland Dreier]

Looks fine overall, with one minor nitpick:

 > -			if (unlikely(memcmp(&neigh->dgid.raw,
 > +			if (unlikely((memcmp(&neigh->dgid.raw,
 >  					    skb->dst->neighbour->ha + 4,
 > -					    sizeof(union ib_gid)))) {
 > +					    sizeof(union ib_gid))) ||
 > +						 (neigh->dev != dev))) {

the indentation here makes this confusing to read -- I would just do:

 		} else if (neigh->ah) {
 			if (unlikely(memcmp(&neigh->dgid.raw,
 					    skb->dst->neighbour->ha + 4,
-					    sizeof(union ib_gid)))) {
+					    sizeof(union ib_gid)) ||
+				     neigh->dev != dev)) {

[ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Roland Dreier]

OK with me.

[ofa-general] Re: [PATCH 03/11] IB/ipoib: Bound the net device to the ipoib_neigh structue

[Roland Dreier]

Overall idea looks good... one comment:

 > +	if (n->dev->flags & IFF_MASTER) {
 > +		/* n->dev is not an IPoIB device and we have
 > +			to take priv from elsewhere */
 > +		neigh = *to_ipoib_neigh(n);
 > +		if (neigh) {
 > +			priv = netdev_priv(neigh->dev);
 > +			ipoib_dbg(priv, "neigh_destructor for bonding device: %s\n",
 > +				  n->dev->name);
 > +		} else
 > +			return;
 > +	}

seems like it would be cleaner not to worry about bonding here and
just use neigh->dev all the time rather than having two ways to look
up the device.

[ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Roland Dreier]

Actually, thinking about this some more... would it be cleaner to more
the knowledge about bonding out of the ipoib driver?  in other words,
export something similar to

 > +static int ipoib_slave_detach(struct net_device *dev)
 > +{
 > +	int ret = 0;
 > +	if (dev->flags & IFF_SLAVE) {
 > +		dev->priv_flags |= IFF_SLAVE_DETACH;
 > +		rtnl_lock();
 > +		ret = call_netdevice_notifiers(NETDEV_CHANGE, dev);
 > +		rtnl_unlock();
 > +	}
 > +	return ret;
 > +}

for drivers to use, rather than putting use of IFF_SLAVE and
IFF_SLAVE_DETACH outside of the bonding driver.

Also it seems this function could return void, since both call sites
ignore the return value and I don't see anything sensible that IPoIB
could do with the notifier chain return value anyway.

 - R.

[ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Jay Vosburgh]

Roland Dreier <rdreier@cisco.com> wrote:

>Actually, thinking about this some more... would it be cleaner to more
>the knowledge about bonding out of the ipoib driver?  in other words,
>export something similar to
>
> > +static int ipoib_slave_detach(struct net_device *dev)
> > +{
> > +	int ret = 0;
> > +	if (dev->flags & IFF_SLAVE) {
> > +		dev->priv_flags |= IFF_SLAVE_DETACH;
> > +		rtnl_lock();
> > +		ret = call_netdevice_notifiers(NETDEV_CHANGE, dev);
> > +		rtnl_unlock();
> > +	}
> > +	return ret;
> > +}
>
>for drivers to use, rather than putting use of IFF_SLAVE and
>IFF_SLAVE_DETACH outside of the bonding driver.

	Conceptually, I see your point and I'm ok with doing it either
way.  My only question is, would this change would make the ipoib module
dependent upon having the bonding module loaded (to resolve all of the
symbols)?

	-J

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@us.ibm.com

Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Roland Dreier]

 > 	Conceptually, I see your point and I'm ok with doing it either
 > way.  My only question is, would this change would make the ipoib module
 > dependent upon having the bonding module loaded (to resolve all of the
 > symbols)?

Yes, I guess so, if that function is in bonding.  Hmm, that wouldn't
be a good change.

Maybe this new notification function should be in net/core/dev.c
instead of exporting call_netdevice_notifiers()?

 - R.

Re: [ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Roland Dreier]

 > Maybe this new notification function should be in net/core/dev.c
 > instead of exporting call_netdevice_notifiers()?

Or actually, does it work to add the call to the notifiers directly in
unregister_netdev() so that device drivers don't have to worry about it?

(And is the existing patch missing a call to notifiers in ipoib_vlan_delete()?)

 - R.

Re: [ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Moni Shoua]

Roland, Jay, 
Thanks a lot for the comments.
I'd like to summarize the points raised so far

1. Reduce the indentation in patch #4 (Roland)
	I will resend
2. Remove the "if (n->dev->flags & IFF_MASTER)" from patch #3 (Roland)
	I will resend
3. Consider making ipoib_slave_detach() net/core/dev.c (Roland, Jay)
	I think that this is a good idea. I can make the patch (and necessary changes to 
	the other patches) assuming this is agreed by all.
4. Change header for patch #1 (Roland)
	I will resend
5. Use NETDEV_GOING_DOWN and not NETDEV_CHANGE + IFF_SLAVE_DETACH (Jay)
	The  NETDEV_GOING_DOWN event is sent in the contex of unregister_netdevice() 
	Since the action in bonding to the event should be unregister the bonding master
	it is not possible to do so. bonding needs to know about the slave detach earlier.
6. call notifiers from unregister_netdev()
	See answer to 5.
7. missing call to notifiers in ipoib_vlan_delete() (Roland)
	It seems like you're right. I will fix and resend.

I think that if there are no other comments, I will submit the entire 11 patches 
again (with changes) to make it easier to merge into the kernel. Since the most of the 
content in the patch series is in bonding I thought it would be right that Jay will 
push all the patches to the networking git. Is it OK with you Roland?




 

Re: [ofa-general] Re: [PATCH 02/11] IB/ipoib: Notify the world before doing unregister

[Roland Dreier]

 > I think that if there are no other comments, I will submit the entire 11 patches 
 > again (with changes) to make it easier to merge into the kernel. Since the most of the 
 > content in the patch series is in bonding I thought it would be right that Jay will 
 > push all the patches to the networking git. Is it OK with you Roland?

Yes, that's fine.

 - R.