Date:	Mon, 28 Sep 2009 18:00:20 -0400
From:	Andy Gospodarek <andy@...yhouse.net>
To:	Jay Vosburgh <fubar@...ibm.com>, netdev@...r.kernel.org,
	bonding-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/4 v3] bonding: make sure tx and rx hash tables stay
	in sync when using alb mode

On Fri, Sep 18, 2009 at 11:56:45AM -0400, Andy Gospodarek wrote:
> On Fri, Sep 18, 2009 at 11:36:22AM -0400, Andy Gospodarek wrote:
> > On Wed, Sep 16, 2009 at 04:36:09PM -0700, Jay Vosburgh wrote:
> > > Andy Gospodarek <andy@...yhouse.net> wrote:
> > > 
> > > >
> > > >Subject: [PATCH] bonding: make sure tx and rx hash tables stay in sync when using alb mode
> > > 
> > > 	When testing this, I'm getting a lockdep warning.  It appears to
> > > be unhappy that tlb_choose_channel acquires the tx / rx hash table locks
> > > in the order tx then rx, but rlb_choose_channel -> alb_get_best_slave
> > > acquires the locks in the other order.  I applied all four patches, but
> > > it looks like the change that trips lockdep is in this patch (#2).
> > > 
> > > 	I haven't gotten an actual deadlock from this, although it seems
> > > plausible if there are two cpus in bond_alb_xmit at the same time, and
> > > one of them is sending an ARP.
> > > 
> > > 	One fairly straightforward fix would be to combine the rx and tx
> > > hash table locks into a single lock.  I suspect that wouldn't have any
> > > real performance penalty, since the rx hash table lock is generally not
> > > acquired very often (unlike the tx lock, which is taken for every packet
> > > that goes out).
> > > 
> > > 	Also, FYI, two of the four patches had trailing whitespace.  I
> > > believe it was #2 and #4.
> > > 
> > > 	Thoughts?
> > 
> > Jay,
> > 
> > This patch should address both the the deadlock and whitespace conerns.
> > I ran a kernel with LOCKDEP enabled and saw no warnings while passing
> > traffic on the bond while pulling cables and while removing the module.
> > Here it is....
> > 
> 
> Adding the version and signed-off-by lines might be nice, eh?
> 
> [PATCH v3] bonding: make sure tx and rx hash tables stay in sync when using alb mode
> 
> I noticed that it was easy for alb (mode 6) bonding to get into a state
> where the tx hash-table and rx hash-table are out of sync (there is
> really nothing to keep them synchronized), and we will transmit traffic
> destined for a host on one slave and send ARP frames to the same slave
> from another interface using a different source MAC.
> 
> There is no compelling reason to do this, so this patch makes sure the
> rx hash-table changes whenever the tx hash-table is updated based on
> device load.  This patch also drops the code that does rlb re-balancing
> since the balancing will not be controlled by the tx hash-table based on
> transmit load.  In order to address an issue found with the initial
> patch, I have also combined the rx and tx hash table lock into a single
> lock.  This will facilitate moving these into a single table at some
> point.
> 
> Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
> 
> ---
>  drivers/net/bonding/bond_alb.c |  203 +++++++++++++++-------------------------
>  drivers/net/bonding/bond_alb.h |    3 +-
>  2 files changed, 75 insertions(+), 131 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
> index bcf25c6..04b7055 100644
> --- a/drivers/net/bonding/bond_alb.c
> +++ b/drivers/net/bonding/bond_alb.c
> @@ -111,6 +111,7 @@ static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
>  
>  /* Forward declaration */
>  static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
> +static struct slave *alb_get_best_slave(struct bonding *bond, u32 hash_index);
>  
>  static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
>  {
> @@ -124,18 +125,18 @@ static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
>  	return hash;
>  }
>  
> -/*********************** tlb specific functions ***************************/
> -
> -static inline void _lock_tx_hashtbl(struct bonding *bond)
> +/********************* hash table lock functions *************************/
> +static inline void _lock_hashtbl(struct bonding *bond)
>  {
> -	spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
> +	spin_lock_bh(&(BOND_ALB_INFO(bond).hashtbl_lock));
>  }
>  
> -static inline void _unlock_tx_hashtbl(struct bonding *bond)
> +static inline void _unlock_hashtbl(struct bonding *bond)
>  {
> -	spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
> +	spin_unlock_bh(&(BOND_ALB_INFO(bond).hashtbl_lock));
>  }
>  
> +/*********************** tlb specific functions ***************************/
>  /* Caller must hold tx_hashtbl lock */
>  static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
>  {
> @@ -163,7 +164,7 @@ static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_
>  	struct tlb_client_info *tx_hash_table;
>  	u32 index;
>  
> -	_lock_tx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	/* clear slave from tx_hashtbl */
>  	tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
> @@ -180,7 +181,7 @@ static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_
>  
>  	tlb_init_slave(slave);
>  
> -	_unlock_tx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /* Must be called before starting the monitor timer */
> @@ -191,7 +192,7 @@ static int tlb_initialize(struct bonding *bond)
>  	struct tlb_client_info *new_hashtbl;
>  	int i;
>  
> -	spin_lock_init(&(bond_info->tx_hashtbl_lock));
> +	spin_lock_init(&(bond_info->hashtbl_lock));
>  
>  	new_hashtbl = kzalloc(size, GFP_KERNEL);
>  	if (!new_hashtbl) {
> @@ -200,7 +201,7 @@ static int tlb_initialize(struct bonding *bond)
>  		       bond->dev->name);
>  		return -1;
>  	}
> -	_lock_tx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	bond_info->tx_hashtbl = new_hashtbl;
>  
> @@ -208,7 +209,7 @@ static int tlb_initialize(struct bonding *bond)
>  		tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
>  	}
>  
> -	_unlock_tx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  
>  	return 0;
>  }
> @@ -218,12 +219,12 @@ static void tlb_deinitialize(struct bonding *bond)
>  {
>  	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
>  
> -	_lock_tx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	kfree(bond_info->tx_hashtbl);
>  	bond_info->tx_hashtbl = NULL;
>  
> -	_unlock_tx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /* Caller must hold bond lock for read */
> @@ -264,24 +265,6 @@ static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
>  	return least_loaded;
>  }
>  
> -/* Caller must hold bond lock for read and hashtbl lock */
> -static struct slave *tlb_get_best_slave(struct bonding *bond, u32 hash_index)
> -{
> -	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> -	struct tlb_client_info *tx_hash_table = bond_info->tx_hashtbl;
> -	struct slave *last_slave = tx_hash_table[hash_index].last_slave;
> -	struct slave *next_slave = NULL;
> -
> -	if (last_slave && SLAVE_IS_OK(last_slave)) {
> -		/* Use the last slave listed in the tx hashtbl if:
> -		   the last slave currently is essentially unloaded. */
> -		if (SLAVE_TLB_INFO(last_slave).load < 10)
> -			next_slave = last_slave;
> -	}
> -
> -	return next_slave ? next_slave : tlb_get_least_loaded_slave(bond);
> -}
> -
>  /* Caller must hold bond lock for read */
>  static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
>  {
> @@ -289,13 +272,12 @@ static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u3
>  	struct tlb_client_info *hash_table;
>  	struct slave *assigned_slave;
>  
> -	_lock_tx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_table = bond_info->tx_hashtbl;
>  	assigned_slave = hash_table[hash_index].tx_slave;
>  	if (!assigned_slave) {
> -		assigned_slave = tlb_get_best_slave(bond, hash_index);
> -
> +		assigned_slave = alb_get_best_slave(bond, hash_index);
>  		if (assigned_slave) {
>  			struct tlb_slave_info *slave_info =
>  				&(SLAVE_TLB_INFO(assigned_slave));
> @@ -319,20 +301,52 @@ static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u3
>  		hash_table[hash_index].tx_bytes += skb_len;
>  	}
>  
> -	_unlock_tx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  
>  	return assigned_slave;
>  }
>  
>  /*********************** rlb specific functions ***************************/
> -static inline void _lock_rx_hashtbl(struct bonding *bond)
> +
> +/* Caller must hold bond lock for read and hashtbl lock */
> +static struct slave *rlb_update_rx_table(struct bonding *bond, struct slave *next_slave, u32 hash_index)
>  {
> -	spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
> +	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> +
> +	/* check rlb table and correct it if wrong */
> +	if (bond_info->rlb_enabled) {
> +		struct rlb_client_info *rx_client_info = &(bond_info->rx_hashtbl[hash_index]);
> +
> +		/* if the new slave computed by tlb checks doesn't match rlb, stop rlb from using it */
> +		if (next_slave && (next_slave != rx_client_info->slave))
> +			rx_client_info->slave = next_slave;
> +	}
> +	return next_slave;
>  }
>  
> -static inline void _unlock_rx_hashtbl(struct bonding *bond)
> +/* Caller must hold bond lock for read and hashtbl lock */
> +static struct slave *alb_get_best_slave(struct bonding *bond, u32 hash_index)
>  {
> -	spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
> +	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> +	struct tlb_client_info *tx_hash_table = bond_info->tx_hashtbl;
> +	struct slave *last_slave = tx_hash_table[hash_index].last_slave;
> +	struct slave *next_slave = NULL;
> +
> +	/* presume the next slave will be the least loaded one */
> +	next_slave = tlb_get_least_loaded_slave(bond);
> +
> +	if (last_slave && SLAVE_IS_OK(last_slave)) {
> +		/* Use the last slave listed in the tx hashtbl if:
> +		   the last slave currently is essentially unloaded. */
> +		if (SLAVE_TLB_INFO(last_slave).load < 10)
> +			next_slave = last_slave;
> +	}
> +
> +	/* update the rlb hashtbl if there was a previous entry */
> +	if (bond_info->rlb_enabled)
> +		rlb_update_rx_table(bond, next_slave, hash_index);
> +
> +	return next_slave;
>  }
>  
>  /* when an ARP REPLY is received from a client update its info
> @@ -344,7 +358,7 @@ static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
>  	struct rlb_client_info *client_info;
>  	u32 hash_index;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
>  	client_info = &(bond_info->rx_hashtbl[hash_index]);
> @@ -358,7 +372,7 @@ static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
>  		bond_info->rx_ntt = 1;
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
> @@ -402,38 +416,6 @@ out:
>  	return res;
>  }
>  
> -/* Caller must hold bond lock for read */
> -static struct slave *rlb_next_rx_slave(struct bonding *bond)
> -{
> -	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> -	struct slave *rx_slave, *slave, *start_at;
> -	int i = 0;
> -
> -	if (bond_info->next_rx_slave) {
> -		start_at = bond_info->next_rx_slave;
> -	} else {
> -		start_at = bond->first_slave;
> -	}
> -
> -	rx_slave = NULL;
> -
> -	bond_for_each_slave_from(bond, slave, i, start_at) {
> -		if (SLAVE_IS_OK(slave)) {
> -			if (!rx_slave) {
> -				rx_slave = slave;
> -			} else if (slave->speed > rx_slave->speed) {
> -				rx_slave = slave;
> -			}
> -		}
> -	}
> -
> -	if (rx_slave) {
> -		bond_info->next_rx_slave = rx_slave->next;
> -	}
> -
> -	return rx_slave;
> -}
> -
>  /* teach the switch the mac of a disabled slave
>   * on the primary for fault tolerance
>   *
> @@ -468,14 +450,14 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
>  	u32 index, next_index;
>  
>  	/* clear slave from rx_hashtbl */
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	rx_hash_table = bond_info->rx_hashtbl;
>  	index = bond_info->rx_hashtbl_head;
>  	for (; index != RLB_NULL_INDEX; index = next_index) {
>  		next_index = rx_hash_table[index].next;
>  		if (rx_hash_table[index].slave == slave) {
> -			struct slave *assigned_slave = rlb_next_rx_slave(bond);
> +			struct slave *assigned_slave = alb_get_best_slave(bond, index);
>  
>  			if (assigned_slave) {
>  				rx_hash_table[index].slave = assigned_slave;
> @@ -499,7 +481,7 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
>  		}
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  
>  	write_lock_bh(&bond->curr_slave_lock);
>  
> @@ -558,7 +540,7 @@ static void rlb_update_rx_clients(struct bonding *bond)
>  	struct rlb_client_info *client_info;
>  	u32 hash_index;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_index = bond_info->rx_hashtbl_head;
>  	for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
> @@ -576,7 +558,7 @@ static void rlb_update_rx_clients(struct bonding *bond)
>  	 */
>  	bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /* The slave was assigned a new mac address - update the clients */
> @@ -587,7 +569,7 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla
>  	int ntt = 0;
>  	u32 hash_index;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_index = bond_info->rx_hashtbl_head;
>  	for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
> @@ -607,7 +589,7 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla
>  		bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /* mark all clients using src_ip to be updated */
> @@ -617,7 +599,7 @@ static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
>  	struct rlb_client_info *client_info;
>  	u32 hash_index;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_index = bond_info->rx_hashtbl_head;
>  	for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
> @@ -643,7 +625,7 @@ static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
>  		}
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /* Caller must hold both bond and ptr locks for read */
> @@ -655,7 +637,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
>  	struct rlb_client_info *client_info;
>  	u32 hash_index = 0;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src));
>  	client_info = &(bond_info->rx_hashtbl[hash_index]);
> @@ -671,7 +653,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
>  
>  			assigned_slave = client_info->slave;
>  			if (assigned_slave) {
> -				_unlock_rx_hashtbl(bond);
> +				_unlock_hashtbl(bond);
>  				return assigned_slave;
>  			}
>  		} else {
> @@ -687,7 +669,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
>  		}
>  	}
>  	/* assign a new slave */
> -	assigned_slave = rlb_next_rx_slave(bond);
> +	assigned_slave = alb_get_best_slave(bond, hash_index);
>  
>  	if (assigned_slave) {
>  		client_info->ip_src = arp->ip_src;
> @@ -723,7 +705,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
>  		}
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  
>  	return assigned_slave;
>  }
> @@ -771,36 +753,6 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
>  	return tx_slave;
>  }
>  
> -/* Caller must hold bond lock for read */
> -static void rlb_rebalance(struct bonding *bond)
> -{
> -	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
> -	struct slave *assigned_slave;
> -	struct rlb_client_info *client_info;
> -	int ntt;
> -	u32 hash_index;
> -
> -	_lock_rx_hashtbl(bond);
> -
> -	ntt = 0;
> -	hash_index = bond_info->rx_hashtbl_head;
> -	for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
> -		client_info = &(bond_info->rx_hashtbl[hash_index]);
> -		assigned_slave = rlb_next_rx_slave(bond);
> -		if (assigned_slave && (client_info->slave != assigned_slave)) {
> -			client_info->slave = assigned_slave;
> -			client_info->ntt = 1;
> -			ntt = 1;
> -		}
> -	}
> -
> -	/* update the team's flag only after the whole iteration */
> -	if (ntt) {
> -		bond_info->rx_ntt = 1;
> -	}
> -	_unlock_rx_hashtbl(bond);
> -}
> -
>  /* Caller must hold rx_hashtbl lock */
>  static void rlb_init_table_entry(struct rlb_client_info *entry)
>  {
> @@ -817,8 +769,6 @@ static int rlb_initialize(struct bonding *bond)
>  	int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
>  	int i;
>  
> -	spin_lock_init(&(bond_info->rx_hashtbl_lock));
> -
>  	new_hashtbl = kmalloc(size, GFP_KERNEL);
>  	if (!new_hashtbl) {
>  		printk(KERN_ERR DRV_NAME
> @@ -826,7 +776,7 @@ static int rlb_initialize(struct bonding *bond)
>  		       bond->dev->name);
>  		return -1;
>  	}
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	bond_info->rx_hashtbl = new_hashtbl;
>  
> @@ -836,7 +786,7 @@ static int rlb_initialize(struct bonding *bond)
>  		rlb_init_table_entry(bond_info->rx_hashtbl + i);
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  
>  	/*initialize packet type*/
>  	pk_type->type = cpu_to_be16(ETH_P_ARP);
> @@ -855,13 +805,13 @@ static void rlb_deinitialize(struct bonding *bond)
>  
>  	dev_remove_pack(&(bond_info->rlb_pkt_type));
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	kfree(bond_info->rx_hashtbl);
>  	bond_info->rx_hashtbl = NULL;
>  	bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
> @@ -869,7 +819,7 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
>  	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
>  	u32 curr_index;
>  
> -	_lock_rx_hashtbl(bond);
> +	_lock_hashtbl(bond);
>  
>  	curr_index = bond_info->rx_hashtbl_head;
>  	while (curr_index != RLB_NULL_INDEX) {
> @@ -894,7 +844,7 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
>  		curr_index = next_index;
>  	}
>  
> -	_unlock_rx_hashtbl(bond);
> +	_unlock_hashtbl(bond);
>  }
>  
>  /*********************** tlb/rlb shared functions *********************/
> @@ -1521,11 +1471,6 @@ void bond_alb_monitor(struct work_struct *work)
>  			read_lock(&bond->lock);
>  		}
>  
> -		if (bond_info->rlb_rebalance) {
> -			bond_info->rlb_rebalance = 0;
> -			rlb_rebalance(bond);
> -		}
> -
>  		/* check if clients need updating */
>  		if (bond_info->rx_ntt) {
>  			if (bond_info->rlb_update_delay_counter) {
> diff --git a/drivers/net/bonding/bond_alb.h b/drivers/net/bonding/bond_alb.h
> index b65fd29..09d755a 100644
> --- a/drivers/net/bonding/bond_alb.h
> +++ b/drivers/net/bonding/bond_alb.h
> @@ -90,7 +90,7 @@ struct tlb_slave_info {
>  struct alb_bond_info {
>  	struct timer_list	alb_timer;
>  	struct tlb_client_info	*tx_hashtbl; /* Dynamically allocated */
> -	spinlock_t		tx_hashtbl_lock;
> +	spinlock_t		hashtbl_lock; /* lock for both tables */
>  	u32			unbalanced_load;
>  	int			tx_rebalance_counter;
>  	int			lp_counter;
> @@ -98,7 +98,6 @@ struct alb_bond_info {
>  	int rlb_enabled;
>  	struct packet_type	rlb_pkt_type;
>  	struct rlb_client_info	*rx_hashtbl;	/* Receive hash table */
> -	spinlock_t		rx_hashtbl_lock;
>  	u32			rx_hashtbl_head;
>  	u8			rx_ntt;	/* flag - need to transmit
>  					 * to all rx clients

Any thoughts on this, Jay?
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