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Commit 0693e88e authored by Michał Mirosław's avatar Michał Mirosław Committed by David S. Miller
Browse files

net: bonding: factor out rlock(bond->lock) in xmit path 



Pull read_lock(&bond->lock) and BOND_IS_OK() to bond_start_xmit() from
mode-dependent xmit functions.

netif_running() is always true in hard_start_xmit.

Signed-off-by: default avatarMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 48752e1b

drivers/net/bonding/bond_3ad.c

+1 −9
Original line number Diff line number Diff line
@@ -2403,14 +2403,6 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev) 
	struct ad_info ad_info;

	int res = 1;



	/* make sure that the slaves list will

	 * not change during tx

	 */

	read_lock(&bond->lock);



	if (!BOND_IS_OK(bond))

		goto out;



	if (bond_3ad_get_active_agg_info(bond, &ad_info)) {

		pr_debug("%s: Error: bond_3ad_get_active_agg_info failed\n",

			 dev->name);
@@ -2464,7 +2456,7 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev) 
		/* no suitable interface, frame not sent */

		dev_kfree_skb(skb);

	}

	read_unlock(&bond->lock);



	return NETDEV_TX_OK;

}

drivers/net/bonding/bond_alb.c

+2 −9
Original line number Diff line number Diff line
@@ -1225,16 +1225,10 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) 
	skb_reset_mac_header(skb);

	eth_data = eth_hdr(skb);



	/* make sure that the curr_active_slave and the slaves list do

	 * not change during tx

	/* make sure that the curr_active_slave do not change during tx

	 */

	read_lock(&bond->lock);

	read_lock(&bond->curr_slave_lock);



	if (!BOND_IS_OK(bond)) {

		goto out;

	}



	switch (ntohs(skb->protocol)) {

	case ETH_P_IP: {

		const struct iphdr *iph = ip_hdr(skb);
@@ -1334,13 +1328,12 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) 
		}

	}



out:

	if (res) {

		/* no suitable interface, frame not sent */

		dev_kfree_skb(skb);

	}

	read_unlock(&bond->curr_slave_lock);

	read_unlock(&bond->lock);



	return NETDEV_TX_OK;

}

drivers/net/bonding/bond_main.c

+32 −42
Original line number Diff line number Diff line
@@ -4004,10 +4004,6 @@ static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev 
	int i, slave_no, res = 1;

	struct iphdr *iph = ip_hdr(skb);



	read_lock(&bond->lock);



	if (!BOND_IS_OK(bond))

		goto out;

	/*

	 * Start with the curr_active_slave that joined the bond as the

	 * default for sending IGMP traffic.  For failover purposes one
@@ -4054,7 +4050,7 @@ static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev 
		/* no suitable interface, frame not sent */

		dev_kfree_skb(skb);

	}

	read_unlock(&bond->lock);



	return NETDEV_TX_OK;

}
@@ -4068,24 +4064,18 @@ static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_d 
	struct bonding *bond = netdev_priv(bond_dev);

	int res = 1;



	read_lock(&bond->lock);

	read_lock(&bond->curr_slave_lock);



	if (!BOND_IS_OK(bond))

		goto out;



	if (!bond->curr_active_slave)

		goto out;



	res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);

	if (bond->curr_active_slave)

		res = bond_dev_queue_xmit(bond, skb,

			bond->curr_active_slave->dev);



out:

	if (res)

		/* no suitable interface, frame not sent */

		dev_kfree_skb(skb);



	read_unlock(&bond->curr_slave_lock);

	read_unlock(&bond->lock);



	return NETDEV_TX_OK;

}
@@ -4102,11 +4092,6 @@ static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 
	int i;

	int res = 1;



	read_lock(&bond->lock);



	if (!BOND_IS_OK(bond))

		goto out;



	slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);



	bond_for_each_slave(bond, slave, i) {
@@ -4126,12 +4111,11 @@ static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 
		}

	}



out:

	if (res) {

		/* no suitable interface, frame not sent */

		dev_kfree_skb(skb);

	}

	read_unlock(&bond->lock);



	return NETDEV_TX_OK;

}
@@ -4146,11 +4130,6 @@ static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 
	int i;

	int res = 1;



	read_lock(&bond->lock);



	if (!BOND_IS_OK(bond))

		goto out;



	read_lock(&bond->curr_slave_lock);

	start_at = bond->curr_active_slave;

	read_unlock(&bond->curr_slave_lock);
@@ -4189,7 +4168,6 @@ static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 
		dev_kfree_skb(skb);



	/* frame sent to all suitable interfaces */

	read_unlock(&bond->lock);

	return NETDEV_TX_OK;

}
@@ -4221,10 +4199,8 @@ static inline int bond_slave_override(struct bonding *bond, 
	struct slave *slave = NULL;

	struct slave *check_slave;



	read_lock(&bond->lock);



	if (!BOND_IS_OK(bond) || !skb->queue_mapping)

		goto out;

	if (!skb->queue_mapping)

		return 1;



	/* Find out if any slaves have the same mapping as this skb. */

	bond_for_each_slave(bond, check_slave, i) {
@@ -4240,8 +4216,6 @@ static inline int bond_slave_override(struct bonding *bond, 
		res = bond_dev_queue_xmit(bond, skb, slave->dev);

	}



out:

	read_unlock(&bond->lock);

	return res;

}
@@ -4263,17 +4237,10 @@ static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 
	return txq;

}



static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)

static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct bonding *bond = netdev_priv(dev);



	/*

	 * If we risk deadlock from transmitting this in the

	 * netpoll path, tell netpoll to queue the frame for later tx

	 */

	if (is_netpoll_tx_blocked(dev))

		return NETDEV_TX_BUSY;



	if (TX_QUEUE_OVERRIDE(bond->params.mode)) {

		if (!bond_slave_override(bond, skb))

			return NETDEV_TX_OK;
@@ -4303,6 +4270,29 @@ static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 
	}

}



static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct bonding *bond = netdev_priv(dev);

	netdev_tx_t ret = NETDEV_TX_OK;



	/*

	 * If we risk deadlock from transmitting this in the

	 * netpoll path, tell netpoll to queue the frame for later tx

	 */

	if (is_netpoll_tx_blocked(dev))

		return NETDEV_TX_BUSY;



	read_lock(&bond->lock);



	if (bond->slave_cnt)

		ret = __bond_start_xmit(skb, dev);

	else

		dev_kfree_skb(skb);



	read_unlock(&bond->lock);



	return ret;

}



/*

 * set bond mode specific net device operations