/*
* Show RLB hash table
*/
static int bond_debug_rlb_hash_show(struct seq_file *m, void *v)
{
struct bonding *bond = m->private;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info;
u32 hash_index;
if (bond->params.mode != BOND_MODE_ALB)
return 0;
seq_printf(m, "SourceIP DestinationIP "
"Destination MAC DEV\n");
spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
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]);
seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n",
&client_info->ip_src,
&client_info->ip_dst,
&client_info->mac_dst,
client_info->slave->dev->name);
}
spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
return 0;
}
/* sends ARP REPLIES that update the clients that need updating */
static void
rlb_update_rx_clients(struct bonding *bond)
{
u32 hash_index;
struct rlb_client_info *client_info = NULL;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
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]);
if (client_info->ntt) {
rlb_update_client(client_info);
if (bond_info->rlb_update_retry_counter == 0) {
client_info->ntt = 0;
}
}
}
/* do not update the entries again untill this counter is zero so that
* not to confuse the clients.
*/
bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
_unlock_rx_hashtbl(bond);
}
/* Must be called before starting the monitor timer */
static int tlb_initialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
struct tlb_client_info *new_hashtbl;
int i;
spin_lock_init(&(bond_info->tx_hashtbl_lock));
new_hashtbl = kzalloc(size, GFP_KERNEL);
if (!new_hashtbl) {
pr_err("%s: Error: Failed to allocate TLB hash table\n",
bond->dev->name);
return -1;
}
_lock_tx_hashtbl(bond);
bond_info->tx_hashtbl = new_hashtbl;
for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
}
_unlock_tx_hashtbl(bond);
return 0;
}
/* 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 = NULL;
u32 hash_index;
struct rlb_client_info *client_info = NULL;
u8 ntt = 0;
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
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);
}
/* when an ARP REPLY is received from a client update its info
* in the rx_hashtbl
*/
static void
rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
{
u32 hash_index;
struct rlb_client_info *client_info = NULL;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
hash_index = _simple_hash((u8*)&(arp->ip_src), 4);
client_info = &(bond_info->rx_hashtbl[hash_index]);
if ((client_info->assigned) &&
(client_info->ip_src == arp->ip_dst) &&
(client_info->ip_dst == arp->ip_src)) {
/* update the clients MAC address */
memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
client_info->ntt = 1;
bond_info->rx_ntt = 1;
}
_unlock_rx_hashtbl(bond);
}
/* Caller must hold bond lock for read */
static struct slave*
rlb_next_rx_slave(struct bonding *bond)
{
struct slave *rx_slave = NULL, *slave = NULL;
unsigned int i = 0;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
slave = bond_info->next_rx_slave;
if (slave == NULL) {
slave = bond->next;
}
/* this loop uses the circular linked list property of the
* slave's list to go through all slaves
*/
for (i = 0; i < bond->slave_cnt; i++, slave = slave->next) {
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;
}
/* Caller must hold bond lock for read */
static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct tlb_client_info *hash_table;
struct slave *assigned_slave,max_assigned_slave,slave;
int i;
_lock_tx_hashtbl(bond);
hash_table = bond_info->tx_hashtbl;
assigned_slave = hash_table[hash_index].tx_slave;
if (!assigned_slave) {
assigned_slave = tlb_get_least_loaded_slave(bond);
if(assigned_slave == assigend_slave_old) {
max_assigned_slave = assigned_slave;
assigned_slave = max_assigned_slave->next;
bond_for_each_slave_from(bond,slave,i) {
if (IS_UP(slave->dev) && (slave->link == BOND_LINK_UP)
&& (slave->state == BOND_STATE_ACTIVE)) {
if (compute_gap(slave) > compute_gap(assigned_slave)
&& slave != max_assigned_slave)
assigned_slave = slave;
}
}
}
static int
rlb_initialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
int i;
size_t size;
spin_lock_init(&(bond_info->rx_hashtbl_lock));
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl != NULL) {
printk (KERN_ERR "%s: RLB hash table is not NULL\n",
bond->device->name);
_unlock_rx_hashtbl(bond);
return -1;
}
size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
bond_info->rx_hashtbl = kmalloc(size, GFP_KERNEL);
if (bond_info->rx_hashtbl == NULL) {
printk (KERN_ERR "%s: Failed to allocate"
" RLB hash table\n", bond->device->name);
_unlock_rx_hashtbl(bond);
return -1;
}
bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
for (i=0; i<RLB_HASH_TABLE_SIZE; i++) {
rlb_init_table_entry(bond_info->rx_hashtbl + i);
}
_unlock_rx_hashtbl(bond);
/* register to receive ARPs */
/*initialize packet type*/
pk_type->type = __constant_htons(ETH_P_ARP);
pk_type->dev = bond->device;
pk_type->func = rlb_arp_recv;
pk_type->data = (void*)1; /* understand shared skbs */
dev_add_pack(pk_type);
return 0;
}
/* Must be called only after all slaves have been released */
static void tlb_deinitialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
_lock_tx_hashtbl(bond);
kfree(bond_info->tx_hashtbl);
bond_info->tx_hashtbl = NULL;
_unlock_tx_hashtbl(bond);
}
/* slave being removed should not be active at this point
*
* Caller must hold bond lock for read
*/
static void
rlb_clear_slave(struct bonding *bond, struct slave *slave)
{
struct rlb_client_info *rx_hash_table = NULL;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
u32 index, next_index;
/* clear slave from rx_hashtbl */
_lock_rx_hashtbl(bond);
rx_hash_table = bond_info->rx_hashtbl;
if (rx_hash_table == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
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);
if (assigned_slave) {
rx_hash_table[index].slave = assigned_slave;
if (memcmp(rx_hash_table[index].mac_dst,
mac_bcast, ETH_ALEN)) {
bond_info->rx_hashtbl[index].ntt = 1;
bond_info->rx_ntt = 1;
/* A slave has been removed from the
* table because it is either disabled
* or being released. We must retry the
* update to avoid clients from not
* being updated & disconnecting when
* there is stress
*/
bond_info->rlb_update_retry_counter =
RLB_UPDATE_RETRY;
}
} else { /* there is no active slave */
rx_hash_table[index].slave = NULL;
}
}
}
_unlock_rx_hashtbl(bond);
write_lock(&bond->ptrlock);
if (slave != bond->current_slave) {
rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
}
write_unlock(&bond->ptrlock);
}
void
bond_alb_deinitialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
tlb_deinitialize(bond);
if (bond_info->rlb_enabled) {
rlb_deinitialize(bond);
}
}
/* Caller must hold tx_hashtbl lock */
static inline void
tlb_init_table_entry(struct bonding *bond, u8 index, u8 save_load)
{
struct tlb_client_info *entry;
if (BOND_ALB_INFO(bond).tx_hashtbl == NULL) {
return;
}
entry = &(BOND_ALB_INFO(bond).tx_hashtbl[index]);
/* at end of cycle, save the load that was transmitted to the client
* during the cycle, and set the tx_bytes counter to 0 for counting
* the load during the next cycle
*/
if (save_load) {
entry->load_history = 1 + entry->tx_bytes /
BOND_TLB_REBALANCE_INTERVAL;
entry->tx_bytes = 0;
}
entry->tx_slave = NULL;
entry->next = TLB_NULL_INDEX;
entry->prev = TLB_NULL_INDEX;
}
/* Caller must hold bond lock for read */
struct slave*
tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct tlb_client_info *hash_table = NULL;
struct slave *assigned_slave = NULL;
_lock_tx_hashtbl(bond);
hash_table = bond_info->tx_hashtbl;
if (hash_table == NULL) {
printk (KERN_ERR "%s: TLB hash table is NULL\n",
bond->device->name);
_unlock_tx_hashtbl(bond);
return NULL;
}
assigned_slave = hash_table[hash_index].tx_slave;
if (!assigned_slave) {
assigned_slave = tlb_get_least_loaded_slave(bond);
if (assigned_slave) {
struct tlb_slave_info *slave_info =
&(SLAVE_TLB_INFO(assigned_slave));
u32 next_index = slave_info->head;
hash_table[hash_index].tx_slave = assigned_slave;
hash_table[hash_index].next = next_index;
hash_table[hash_index].prev = TLB_NULL_INDEX;
if (next_index != TLB_NULL_INDEX) {
hash_table[next_index].prev = hash_index;
}
slave_info->head = hash_index;
slave_info->load +=
hash_table[hash_index].load_history;
}
}
if (assigned_slave) {
hash_table[hash_index].tx_bytes += skb_len;
}
_unlock_tx_hashtbl(bond);
return assigned_slave;
}
static void
rlb_deinitialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
dev_remove_pack(&(bond_info->rlb_pkt_type));
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
kfree(bond_info->rx_hashtbl);
bond_info->rx_hashtbl = NULL;
_unlock_rx_hashtbl(bond);
}
/* mark all clients using src_ip to be updated */
static void
rlb_req_update_subnet_clients(struct bonding *bond, u32 src_ip)
{
u32 hash_index;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
struct rlb_client_info *client_info = NULL;
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
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]);
if (!client_info->slave) {
printk(KERN_ERR "Bonding: Error: found a client with no"
" channel in the client's hash table\n");
continue;
}
/*update all clients using this src_ip, that are not assigned
* to the team's address (current_slave) and have a known
* unicast mac address.
*/
if ((client_info->ip_src == src_ip) &&
memcmp(client_info->slave->dev->dev_addr,
bond->device->dev_addr, ETH_ALEN) &&
memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
client_info->ntt = 1;
bond_info->rx_ntt = 1;
}
}
_unlock_rx_hashtbl(bond);
}
/* Must be called before starting the monitor timer */
static int
tlb_initialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
int i;
size_t size;
#if(TLB_HASH_TABLE_SIZE != 256)
/* Key to the hash table is byte wide. Check the size! */
#error Hash Table size is wrong.
#endif
spin_lock_init(&(bond_info->tx_hashtbl_lock));
_lock_tx_hashtbl(bond);
if (bond_info->tx_hashtbl != NULL) {
printk (KERN_ERR "%s: TLB hash table is not NULL\n",
bond->device->name);
_unlock_tx_hashtbl(bond);
return -1;
}
size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
bond_info->tx_hashtbl = kmalloc(size, GFP_KERNEL);
if (bond_info->tx_hashtbl == NULL) {
printk (KERN_ERR "%s: Failed to allocate TLB hash table\n",
bond->device->name);
_unlock_tx_hashtbl(bond);
return -1;
}
memset(bond_info->tx_hashtbl, 0, size);
for (i=0; i<TLB_HASH_TABLE_SIZE; i++) {
tlb_init_table_entry(bond, i, 1);
}
_unlock_tx_hashtbl(bond);
return 0;
}
/* Caller must hold bond lock for read */
static inline void
tlb_clear_slave(struct bonding *bond, struct slave *slave, u8 save_load)
{
struct tlb_client_info *tx_hash_table = NULL;
u32 index, next_index;
/* clear slave from tx_hashtbl */
_lock_tx_hashtbl(bond);
tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
if (tx_hash_table) {
index = SLAVE_TLB_INFO(slave).head;
while (index != TLB_NULL_INDEX) {
next_index = tx_hash_table[index].next;
tlb_init_table_entry(bond, index, save_load);
index = next_index;
}
}
_unlock_tx_hashtbl(bond);
tlb_init_slave(slave);
}
/* Caller must hold bond lock for read */
void
bond_alb_handle_link_change(struct bonding *bond, struct slave *slave,
char link)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
if (link == BOND_LINK_DOWN) {
tlb_clear_slave(bond, slave, 0);
if (bond->alb_info.rlb_enabled) {
rlb_clear_slave(bond, slave);
}
} else if (link == BOND_LINK_UP) {
/* order a rebalance ASAP */
bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
if (bond->alb_info.rlb_enabled) {
bond->alb_info.rlb_rebalance = 1;
/* If the updelay module parameter is smaller than the
* forwarding delay of the switch the rebalance will
* not work because the rebalance arp replies will
* not be forwarded to the clients..
*/
}
}
}
/* The slave was assigned a new mac address - update the clients */
static void
rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
{
u32 hash_index;
u8 ntt = 0;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
struct rlb_client_info* client_info = NULL;
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return;
}
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]);
if ((client_info->slave == slave) &&
memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
client_info->ntt = 1;
ntt = 1;
}
}
// update the team's flag only after the whole iteration
if (ntt) {
bond_info->rx_ntt = 1;
//fasten the change
bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
}
_unlock_rx_hashtbl(bond);
}
/* Caller must hold bond lock for read */
static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
{
struct tlb_client_info *tx_hash_table;
u32 index;
_lock_tx_hashtbl(bond);
/* clear slave from tx_hashtbl */
tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
/* skip this if we've already freed the tx hash table */
if (tx_hash_table) {
index = SLAVE_TLB_INFO(slave).head;
while (index != TLB_NULL_INDEX) {
u32 next_index = tx_hash_table[index].next;
tlb_init_table_entry(&tx_hash_table[index], save_load);
index = next_index;
}
}
tlb_init_slave(slave);
_unlock_tx_hashtbl(bond);
}
void
bond_alb_monitor(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct slave *slave = NULL;
read_lock(&bond->lock);
if ((bond->slave_cnt == 0) || !(bond->device->flags & IFF_UP)) {
bond_info->tx_rebalance_counter = 0;
bond_info->lp_counter = 0;
goto out;
}
bond_info->tx_rebalance_counter++;
bond_info->lp_counter++;
/* send learning packets */
if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
/* change of current_slave involves swapping of mac addresses.
* in order to avoid this swapping from happening while
* sending the learning packets, the ptrlock must be held for
* read.
*/
read_lock(&bond->ptrlock);
slave = bond_get_first_slave(bond);
while (slave) {
alb_send_learning_packets(slave,slave->dev->dev_addr);
slave = bond_get_next_slave(bond, slave);
}
read_unlock(&bond->ptrlock);
bond_info->lp_counter = 0;
}
/* rebalance tx traffic */
if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
read_lock(&bond->ptrlock);
slave = bond_get_first_slave(bond);
while (slave) {
tlb_clear_slave(bond, slave, 1);
if (slave == bond->current_slave) {
SLAVE_TLB_INFO(slave).load =
bond_info->unbalanced_load /
BOND_TLB_REBALANCE_INTERVAL;
bond_info->unbalanced_load = 0;
}
slave = bond_get_next_slave(bond, slave);
}
read_unlock(&bond->ptrlock);
bond_info->tx_rebalance_counter = 0;
}
/* handle rlb stuff */
if (bond_info->rlb_enabled) {
/* the following code changes the promiscuity of the
* the current_slave. It needs to be locked with a
* write lock to protect from other code that also
* sets the promiscuity.
*/
write_lock(&bond->ptrlock);
if (bond_info->primary_is_promisc &&
(++bond_info->rlb_promisc_timeout_counter >=
RLB_PROMISC_TIMEOUT)) {
bond_info->rlb_promisc_timeout_counter = 0;
/* If the primary was set to promiscuous mode
* because a slave was disabled then
* it can now leave promiscuous mode.
*/
dev_set_promiscuity(bond->current_slave->dev, -1);
bond_info->primary_is_promisc = 0;
}
write_unlock(&bond->ptrlock);
if (bond_info->rlb_rebalance == 1) {
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) {
--bond_info->rlb_update_delay_counter;
} else {
rlb_update_rx_clients(bond);
if (bond_info->rlb_update_retry_counter) {
--bond_info->rlb_update_retry_counter;
} else {
bond_info->rx_ntt = 0;
}
}
}
}
out:
read_unlock(&bond->lock);
if (bond->device->flags & IFF_UP) {
/* re-arm the timer */
mod_timer(&(bond_info->alb_timer),
jiffies + (HZ/ALB_TIMER_TICKS_PER_SEC));
}
}
/*********************** rlb specific functions ***************************/
static inline void
_lock_rx_hashtbl(struct bonding *bond)
{
spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
}
int
bond_alb_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = (struct bonding *) dev->priv;
struct ethhdr *eth_data = (struct ethhdr *)skb->data;
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct slave *tx_slave = NULL;
char do_tx_balance = 1;
int hash_size = 0;
u32 hash_index = 0;
u8 *hash_start = NULL;
u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
if (!IS_UP(dev)) { /* bond down */
dev_kfree_skb(skb);
return 0;
}
/* make sure that the current_slave and the slaves list do
* not change during tx
*/
read_lock(&bond->lock);
if (bond->slave_cnt == 0) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
read_unlock(&bond->lock);
return 0;
}
read_lock(&bond->ptrlock);
switch (ntohs(skb->protocol)) {
case ETH_P_IP:
if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
(skb->nh.iph->daddr == 0xffffffff)) {
do_tx_balance = 0;
break;
}
hash_start = (char*)&(skb->nh.iph->daddr);
hash_size = 4;
break;
case ETH_P_IPV6:
if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
do_tx_balance = 0;
break;
}
hash_start = (char*)&(skb->nh.ipv6h->daddr);
hash_size = 16;
break;
case ETH_P_IPX:
if (skb->nh.ipxh->ipx_checksum !=
__constant_htons(IPX_NO_CHECKSUM)) {
/* something is wrong with this packet */
do_tx_balance = 0;
break;
}
if (skb->nh.ipxh->ipx_type !=
__constant_htons(IPX_TYPE_NCP)) {
/* The only protocol worth balancing in
* this family since it has an "ARP" like
* mechanism
*/
do_tx_balance = 0;
break;
}
hash_start = (char*)eth_data->h_dest;
hash_size = ETH_ALEN;
break;
case ETH_P_ARP:
do_tx_balance = 0;
if (bond_info->rlb_enabled) {
tx_slave = rlb_arp_xmit(skb, bond);
}
break;
default:
do_tx_balance = 0;
break;
}
if (do_tx_balance) {
hash_index = _simple_hash(hash_start, hash_size);
tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
}
if (!tx_slave) {
/* unbalanced or unassigned, send through primary */
tx_slave = bond->current_slave;
bond_info->unbalanced_load += skb->len;
}
if (tx_slave && SLAVE_IS_OK(tx_slave)) {
skb->dev = tx_slave->dev;
if (tx_slave != bond->current_slave) {
memcpy(eth_data->h_source,
tx_slave->dev->dev_addr,
ETH_ALEN);
}
dev_queue_xmit(skb);
} else {
/* no suitable interface, frame not sent */
if (tx_slave) {
tlb_clear_slave(bond, tx_slave, 0);
}
dev_kfree_skb(skb);
}
read_unlock(&bond->ptrlock);
read_unlock(&bond->lock);
return 0;
}
/* Caller must hold both bond and ptr locks for read */
struct slave*
rlb_choose_channel(struct bonding *bond, struct arp_pkt *arp)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info = NULL;
u32 hash_index = 0;
struct slave *assigned_slave = NULL;
u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
_lock_rx_hashtbl(bond);
if (bond_info->rx_hashtbl == NULL) {
_unlock_rx_hashtbl(bond);
return NULL;
}
hash_index = _simple_hash((u8 *)&arp->ip_dst, 4);
client_info = &(bond_info->rx_hashtbl[hash_index]);
if (client_info->assigned == 1) {
if ((client_info->ip_src == arp->ip_src) &&
(client_info->ip_dst == arp->ip_dst)) {
/* the entry is already assigned to this client */
if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
/* update mac address from arp */
memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
}
assigned_slave = client_info->slave;
if (assigned_slave) {
_unlock_rx_hashtbl(bond);
return assigned_slave;
}
} else {
/* the entry is already assigned to some other client,
* move the old client to primary (current_slave) so
* that the new client can be assigned to this entry.
*/
if (bond->current_slave &&
client_info->slave != bond->current_slave) {
client_info->slave = bond->current_slave;
rlb_update_client(client_info);
}
}
}
/* assign a new slave */
assigned_slave = rlb_next_rx_slave(bond);
if (assigned_slave) {
client_info->ip_src = arp->ip_src;
client_info->ip_dst = arp->ip_dst;
/* arp->mac_dst is broadcast for arp reqeusts.
* will be updated with clients actual unicast mac address
* upon receiving an arp reply.
*/
memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
client_info->slave = assigned_slave;
if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
client_info->ntt = 1;
bond->alb_info.rx_ntt = 1;
}
else {
client_info->ntt = 0;
}
if (!client_info->assigned) {
u32 prev_tbl_head = bond_info->rx_hashtbl_head;
bond_info->rx_hashtbl_head = hash_index;
client_info->next = prev_tbl_head;
if (prev_tbl_head != RLB_NULL_INDEX) {
bond_info->rx_hashtbl[prev_tbl_head].prev =
hash_index;
}
client_info->assigned = 1;
}
}
_unlock_rx_hashtbl(bond);
return assigned_slave;
}
static inline void _unlock_tx_hashtbl(struct bonding *bond)
{
spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
}