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Date: Thu, 12 Nov 2015 16:02:18 +0000
From: Premkumar Jonnala <pjonnala@...adcom.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] bonding: Offloading bonds to hardware
Packet forwarding to/from bond interfaces is done in software.
This patch enables certain platforms to bridge traffic to/from
bond interfaces in hardware. Notifications are sent out when
the "active" slave set for a bond interface is updated in
software. Platforms use the notifications to program the
hardware accordingly. The changes have been verified to work
with configured and 802.3ad bond interfaces.
Signed-off-by: Premkumar Jonnala <pjonnala@...adcom.com>
---
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index b4351ca..4b53733 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3759,6 +3759,101 @@ err:
bond_slave_arr_work_rearm(bond, 1);
}
+static int slave_present(struct slave *slave, struct bond_up_slave *arr)
+{
+ int i;
+
+ if (!arr)
+ return 0;
+
+ for (i = 0; i < arr->count; i++) {
+ if (arr->arr[i] == slave)
+ return 1;
+ }
+ return 0;
+}
+
+/* Send notification to clear/remove slaves for 'bond' in 'arr' except for
+ * slaves in 'ignore_arr'.
+ */
+static int bond_slave_arr_clear_notify(struct bonding *bond,
+ struct bond_up_slave *arr,
+ struct bond_up_slave *ignore_arr)
+{
+ struct slave *slave;
+ struct net_device *slave_dev;
+ int i, rv;
+ const struct net_device_ops *ops;
+
+ if (!bond->dev || !arr)
+ return -EINVAL;
+
+ rv = 0;
+ for (i = 0; i < arr->count; i++) {
+ slave = arr->arr[i];
+ if (!slave || !slave->dev)
+ continue;
+
+ slave_dev = slave->dev;
+ if (slave_present(slave, ignore_arr)) {
+ netdev_dbg(bond->dev, "ignoring clear of slave %s\n",
+ slave_dev->name);
+ continue;
+ }
+ ops = slave_dev->netdev_ops;
+ if (!ops || !ops->ndo_bond_slave_discard) {
+ netdev_dbg(bond->dev, "No slave discard ops for %s\n",
+ slave_dev->name);
+ continue;
+ }
+ rv = ops->ndo_bond_slave_discard(slave_dev, bond->dev);
+ if (rv < 0)
+ return rv;
+ }
+ return rv;
+}
+
+/* Send notification about updated slaves for 'bond' except for slaves in
+ * 'ignore_arr'.
+ */
+static int bond_slave_arr_set_notify(struct bonding *bond,
+ struct bond_up_slave *ignore_arr)
+{
+ struct slave *slave;
+ struct net_device *slave_dev;
+ struct bond_up_slave *arr;
+ int i, rv;
+ const struct net_device_ops *ops;
+
+ if (!bond || !bond->dev)
+ return -EINVAL;
+ rv = 0;
+
+ arr = rtnl_dereference(bond->slave_arr);
+ if (!arr)
+ return -EINVAL;
+
+ for (i = 0; i < arr->count; i++) {
+ slave = arr->arr[i];
+ slave_dev = slave->dev;
+ if (slave_present(slave, ignore_arr)) {
+ netdev_dbg(bond->dev, "ignoring add of slave %s\n",
+ slave->dev->name);
+ continue;
+ }
+ ops = slave_dev->netdev_ops;
+ if (!ops || !ops->ndo_bond_slave_add) {
+ netdev_dbg(bond->dev, "No slave add ops for %s\n",
+ slave_dev->name);
+ continue;
+ }
+ rv = ops->ndo_bond_slave_add(slave_dev, bond->dev);
+ if (rv < 0)
+ return rv;
+ }
+ return rv;
+}
+
/* Build the usable slaves array in control path for modes that use xmit-hash
* to determine the slave interface -
* (a) BOND_MODE_8023AD
@@ -3771,7 +3866,7 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
{
struct slave *slave;
struct list_head *iter;
- struct bond_up_slave *new_arr, *old_arr;
+ struct bond_up_slave *new_arr, *old_arr, *discard_arr = 0;
int agg_id = 0;
int ret = 0;
@@ -3786,6 +3881,12 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
pr_err("Failed to build slave-array.\n");
goto out;
}
+ discard_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
+ GFP_KERNEL);
+ if (!discard_arr) {
+ ret = -ENOMEM;
+ goto out;
+ }
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
struct ad_info ad_info;
@@ -3797,6 +3898,7 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
*/
old_arr = rtnl_dereference(bond->slave_arr);
if (old_arr) {
+ bond_slave_arr_clear_notify(bond, old_arr, 0);
RCU_INIT_POINTER(bond->slave_arr, NULL);
kfree_rcu(old_arr, rcu);
}
@@ -3809,8 +3911,10 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
struct aggregator *agg;
agg = SLAVE_AD_INFO(slave)->port.aggregator;
- if (!agg || agg->aggregator_identifier != agg_id)
+ if (!agg || agg->aggregator_identifier != agg_id) {
+ discard_arr->arr[discard_arr->count++] = slave;
continue;
+ }
}
if (!bond_slave_can_tx(slave))
continue;
@@ -3820,10 +3924,15 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
}
old_arr = rtnl_dereference(bond->slave_arr);
+ bond_slave_arr_clear_notify(bond, old_arr, new_arr);
+ bond_slave_arr_clear_notify(bond, discard_arr, 0);
rcu_assign_pointer(bond->slave_arr, new_arr);
+ bond_slave_arr_set_notify(bond, old_arr);
if (old_arr)
kfree_rcu(old_arr, rcu);
out:
+ if (discard_arr)
+ kfree(discard_arr);
if (ret != 0 && skipslave) {
int idx;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4ac653b..facc35f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1236,6 +1236,10 @@ struct net_device_ops {
bool proto_down);
int (*ndo_fill_metadata_dst)(struct net_device *dev,
struct sk_buff *skb);
+ int (*ndo_bond_slave_add)(struct net_device *slave_dev,
+ struct net_device *bond);
+ int (*ndo_bond_slave_discard)(struct net_device *slave_dev,
+ struct net_device *bond);
};
/**
--
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