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linux/drivers/net/bonding/bond_3ad.c
Veaceslav Falico 49b7624eda bonding: fix __get_active_agg() RCU logic 
Currently, the implementation is meaningless - once again, we take the
slave structure and use it after we've exited RCU critical section.

Fix this by removing the rcu_read_lock() from __get_active_agg(), and
ensuring that all its callers are holding RCU.

Fixes: be79bd048 ("bonding: add RCU for bond_3ad_state_machine_handler()")
CC: dingtianhong@huawei.com
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-13 22:22:27 -08:00

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/*
* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_bonding.h>
#include <linux/pkt_sched.h>
#include <net/net_namespace.h>
#include "bonding.h"
#include "bond_3ad.h"
/* General definitions */
#define AD_SHORT_TIMEOUT 1
#define AD_LONG_TIMEOUT 0
#define AD_STANDBY 0x2
#define AD_MAX_TX_IN_SECOND 3
#define AD_COLLECTOR_MAX_DELAY 0
/* Timer definitions (43.4.4 in the 802.3ad standard) */
#define AD_FAST_PERIODIC_TIME 1
#define AD_SLOW_PERIODIC_TIME 30
#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
#define AD_CHURN_DETECTION_TIME 60
#define AD_AGGREGATE_WAIT_TIME 2
/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
#define AD_STATE_LACP_ACTIVITY 0x1
#define AD_STATE_LACP_TIMEOUT 0x2
#define AD_STATE_AGGREGATION 0x4
#define AD_STATE_SYNCHRONIZATION 0x8
#define AD_STATE_COLLECTING 0x10
#define AD_STATE_DISTRIBUTING 0x20
#define AD_STATE_DEFAULTED 0x40
#define AD_STATE_EXPIRED 0x80
/* Port Variables definitions used by the State Machines (43.4.7 in the
* 802.3ad standard)
*/
#define AD_PORT_BEGIN 0x1
#define AD_PORT_LACP_ENABLED 0x2
#define AD_PORT_ACTOR_CHURN 0x4
#define AD_PORT_PARTNER_CHURN 0x8
#define AD_PORT_READY 0x10
#define AD_PORT_READY_N 0x20
#define AD_PORT_MATCHED 0x40
#define AD_PORT_STANDBY 0x80
#define AD_PORT_SELECTED 0x100
#define AD_PORT_MOVED 0x200
/* Port Key definitions
* key is determined according to the link speed, duplex and
* user key (which is yet not supported)
* --------------------------------------------------------------
* Port key : | User key | Speed | Duplex |
* --------------------------------------------------------------
* 16 6 1 0
*/
#define AD_DUPLEX_KEY_BITS 0x1
#define AD_SPEED_KEY_BITS 0x3E
#define AD_USER_KEY_BITS 0xFFC0
#define AD_LINK_SPEED_BITMASK_1MBPS 0x1
#define AD_LINK_SPEED_BITMASK_10MBPS 0x2
#define AD_LINK_SPEED_BITMASK_100MBPS 0x4
#define AD_LINK_SPEED_BITMASK_1000MBPS 0x8
#define AD_LINK_SPEED_BITMASK_10000MBPS 0x10
/* compare MAC addresses */
#define MAC_ADDRESS_EQUAL(A, B) \
ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
static u16 ad_ticks_per_sec;
static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
/* ================= main 802.3ad protocol functions ================== */
static int ad_lacpdu_send(struct port *port);
static int ad_marker_send(struct port *port, struct bond_marker *marker);
static void ad_mux_machine(struct port *port);
static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
static void ad_tx_machine(struct port *port);
static void ad_periodic_machine(struct port *port);
static void ad_port_selection_logic(struct port *port);
static void ad_agg_selection_logic(struct aggregator *aggregator);
static void ad_clear_agg(struct aggregator *aggregator);
static void ad_initialize_agg(struct aggregator *aggregator);
static void ad_initialize_port(struct port *port, int lacp_fast);
static void ad_enable_collecting_distributing(struct port *port);
static void ad_disable_collecting_distributing(struct port *port);
static void ad_marker_info_received(struct bond_marker *marker_info,
struct port *port);
static void ad_marker_response_received(struct bond_marker *marker,
struct port *port);
/* ================= api to bonding and kernel code ================== */
/**
* __get_bond_by_port - get the port's bonding struct
* @port: the port we're looking at
*
* Return @port's bonding struct, or %NULL if it can't be found.
*/
static inline struct bonding *__get_bond_by_port(struct port *port)
{
if (port->slave == NULL)
return NULL;
return bond_get_bond_by_slave(port->slave);
}
/**
* __get_first_agg - get the first aggregator in the bond
* @bond: the bond we're looking at
*
* Return the aggregator of the first slave in @bond, or %NULL if it can't be
* found.
* The caller must hold RCU or RTNL lock.
*/
static inline struct aggregator *__get_first_agg(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
struct slave *first_slave;
struct aggregator *agg;
/* If there's no bond for this port, or bond has no slaves */
if (bond == NULL)
return NULL;
rcu_read_lock();
first_slave = bond_first_slave_rcu(bond);
agg = first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
rcu_read_unlock();
return agg;
}
/**
* __agg_has_partner - see if we have a partner
* @agg: the agregator we're looking at
*
* Return nonzero if aggregator has a partner (denoted by a non-zero ether
* address for the partner). Return 0 if not.
*/
static inline int __agg_has_partner(struct aggregator *agg)
{
return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
}
/**
* __disable_port - disable the port's slave
* @port: the port we're looking at
*/
static inline void __disable_port(struct port *port)
{
bond_set_slave_inactive_flags(port->slave);
}
/**
* __enable_port - enable the port's slave, if it's up
* @port: the port we're looking at
*/
static inline void __enable_port(struct port *port)
{
struct slave *slave = port->slave;
if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
bond_set_slave_active_flags(slave);
}
/**
* __port_is_enabled - check if the port's slave is in active state
* @port: the port we're looking at
*/
static inline int __port_is_enabled(struct port *port)
{
return bond_is_active_slave(port->slave);
}
/**
* __get_agg_selection_mode - get the aggregator selection mode
* @port: the port we're looking at
*
* Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
*/
static inline u32 __get_agg_selection_mode(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
if (bond == NULL)
return BOND_AD_STABLE;
return bond->params.ad_select;
}
/**
* __check_agg_selection_timer - check if the selection timer has expired
* @port: the port we're looking at
*/
static inline int __check_agg_selection_timer(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
if (bond == NULL)
return 0;
return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
}
/**
* __get_state_machine_lock - lock the port's state machines
* @port: the port we're looking at
*/
static inline void __get_state_machine_lock(struct port *port)
{
spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
}
/**
* __release_state_machine_lock - unlock the port's state machines
* @port: the port we're looking at
*/
static inline void __release_state_machine_lock(struct port *port)
{
spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
}
/**
* __get_link_speed - get a port's speed
* @port: the port we're looking at
*
* Return @port's speed in 802.3ad bitmask format. i.e. one of:
* 0,
* %AD_LINK_SPEED_BITMASK_10MBPS,
* %AD_LINK_SPEED_BITMASK_100MBPS,
* %AD_LINK_SPEED_BITMASK_1000MBPS,
* %AD_LINK_SPEED_BITMASK_10000MBPS
*/
static u16 __get_link_speed(struct port *port)
{
struct slave *slave = port->slave;
u16 speed;
/* this if covers only a special case: when the configuration starts
* with link down, it sets the speed to 0.
* This is done in spite of the fact that the e100 driver reports 0
* to be compatible with MVT in the future.
*/
if (slave->link != BOND_LINK_UP)
speed = 0;
else {
switch (slave->speed) {
case SPEED_10:
speed = AD_LINK_SPEED_BITMASK_10MBPS;
break;
case SPEED_100:
speed = AD_LINK_SPEED_BITMASK_100MBPS;
break;
case SPEED_1000:
speed = AD_LINK_SPEED_BITMASK_1000MBPS;
break;
case SPEED_10000:
speed = AD_LINK_SPEED_BITMASK_10000MBPS;
break;
default:
/* unknown speed value from ethtool. shouldn't happen */
speed = 0;
break;
}
}
pr_debug("Port %d Received link speed %d update from adapter\n",
port->actor_port_number, speed);
return speed;
}
/**
* __get_duplex - get a port's duplex
* @port: the port we're looking at
*
* Return @port's duplex in 802.3ad bitmask format. i.e.:
* 0x01 if in full duplex
* 0x00 otherwise
*/
static u8 __get_duplex(struct port *port)
{
struct slave *slave = port->slave;
u8 retval;
/* handling a special case: when the configuration starts with
* link down, it sets the duplex to 0.
*/
if (slave->link != BOND_LINK_UP)
retval = 0x0;
else {
switch (slave->duplex) {
case DUPLEX_FULL:
retval = 0x1;
pr_debug("Port %d Received status full duplex update from adapter\n",
port->actor_port_number);
break;
case DUPLEX_HALF:
default:
retval = 0x0;
pr_debug("Port %d Received status NOT full duplex update from adapter\n",
port->actor_port_number);
break;
}
}
return retval;
}
/**
* __initialize_port_locks - initialize a port's STATE machine spinlock
* @port: the slave of the port we're looking at
*/
static inline void __initialize_port_locks(struct slave *slave)
{
/* make sure it isn't called twice */
spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
}
/* Conversions */
/**
* __ad_timer_to_ticks - convert a given timer type to AD module ticks
* @timer_type: which timer to operate
* @par: timer parameter. see below
*
* If @timer_type is %current_while_timer, @par indicates long/short timer.
* If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
* %SLOW_PERIODIC_TIME.
*/
static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
{
u16 retval = 0; /* to silence the compiler */
switch (timer_type) {
case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
if (par)
retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
else
retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
break;
case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
break;
case AD_PERIODIC_TIMER: /* for periodic machine */
retval = (par*ad_ticks_per_sec); /* long timeout */
break;
case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
break;
case AD_WAIT_WHILE_TIMER: /* for selection machine */
retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
break;
}
return retval;
}
/* ================= ad_rx_machine helper functions ================== */
/**
* __choose_matched - update a port's matched variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Update the value of the matched variable, using parameter values from a
* newly received lacpdu. Parameter values for the partner carried in the
* received PDU are compared with the corresponding operational parameter
* values for the actor. Matched is set to TRUE if all of these parameters
* match and the PDU parameter partner_state.aggregation has the same value as
* actor_oper_port_state.aggregation and lacp will actively maintain the link
* in the aggregation. Matched is also set to TRUE if the value of
* actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
* an individual link and lacp will actively maintain the link. Otherwise,
* matched is set to FALSE. LACP is considered to be actively maintaining the
* link if either the PDU's actor_state.lacp_activity variable is TRUE or both
* the actor's actor_oper_port_state.lacp_activity and the PDU's
* partner_state.lacp_activity variables are TRUE.
*
* Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
* used here to implement the language from 802.3ad 43.4.9 that requires
* recordPDU to "match" the LACPDU parameters to the stored values.
*/
static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
{
/* check if all parameters are alike
* or this is individual link(aggregation == FALSE)
* then update the state machine Matched variable.
*/
if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
(ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
(ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
(ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
) {
port->sm_vars |= AD_PORT_MATCHED;
} else {
port->sm_vars &= ~AD_PORT_MATCHED;
}
}
/**
* __record_pdu - record parameters from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Record the parameter values for the Actor carried in a received lacpdu as
* the current partner operational parameter values and sets
* actor_oper_port_state.defaulted to FALSE.
*/
static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
{
if (lacpdu && port) {
struct port_params *partner = &port->partner_oper;
__choose_matched(lacpdu, port);
/* record the new parameter values for the partner
* operational
*/
partner->port_number = ntohs(lacpdu->actor_port);
partner->port_priority = ntohs(lacpdu->actor_port_priority);
partner->system = lacpdu->actor_system;
partner->system_priority = ntohs(lacpdu->actor_system_priority);
partner->key = ntohs(lacpdu->actor_key);
partner->port_state = lacpdu->actor_state;
/* set actor_oper_port_state.defaulted to FALSE */
port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
/* set the partner sync. to on if the partner is sync,
* and the port is matched
*/
if ((port->sm_vars & AD_PORT_MATCHED)
&& (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
partner->port_state |= AD_STATE_SYNCHRONIZATION;
else
partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
}
}
/**
* __record_default - record default parameters
* @port: the port we're looking at
*
* This function records the default parameter values for the partner carried
* in the Partner Admin parameters as the current partner operational parameter
* values and sets actor_oper_port_state.defaulted to TRUE.
*/
static void __record_default(struct port *port)
{
if (port) {
/* record the partner admin parameters */
memcpy(&port->partner_oper, &port->partner_admin,
sizeof(struct port_params));
/* set actor_oper_port_state.defaulted to true */
port->actor_oper_port_state |= AD_STATE_DEFAULTED;
}
}
/**
* __update_selected - update a port's Selected variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Update the value of the selected variable, using parameter values from a
* newly received lacpdu. The parameter values for the Actor carried in the
* received PDU are compared with the corresponding operational parameter
* values for the ports partner. If one or more of the comparisons shows that
* the value(s) received in the PDU differ from the current operational values,
* then selected is set to FALSE and actor_oper_port_state.synchronization is
* set to out_of_sync. Otherwise, selected remains unchanged.
*/
static void __update_selected(struct lacpdu *lacpdu, struct port *port)
{
if (lacpdu && port) {
const struct port_params *partner = &port->partner_oper;
/* check if any parameter is different then
* update the state machine selected variable.
*/
if (ntohs(lacpdu->actor_port) != partner->port_number ||
ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
!MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
ntohs(lacpdu->actor_key) != partner->key ||
(lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
port->sm_vars &= ~AD_PORT_SELECTED;
}
}
}
/**
* __update_default_selected - update a port's Selected variable from Partner
* @port: the port we're looking at
*
* This function updates the value of the selected variable, using the partner
* administrative parameter values. The administrative values are compared with
* the corresponding operational parameter values for the partner. If one or
* more of the comparisons shows that the administrative value(s) differ from
* the current operational values, then Selected is set to FALSE and
* actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
* Selected remains unchanged.
*/
static void __update_default_selected(struct port *port)
{
if (port) {
const struct port_params *admin = &port->partner_admin;
const struct port_params *oper = &port->partner_oper;
/* check if any parameter is different then
* update the state machine selected variable.
*/
if (admin->port_number != oper->port_number ||
admin->port_priority != oper->port_priority ||
!MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
admin->system_priority != oper->system_priority ||
admin->key != oper->key ||
(admin->port_state & AD_STATE_AGGREGATION)
!= (oper->port_state & AD_STATE_AGGREGATION)) {
port->sm_vars &= ~AD_PORT_SELECTED;
}
}
}
/**
* __update_ntt - update a port's ntt variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Updates the value of the ntt variable, using parameter values from a newly
* received lacpdu. The parameter values for the partner carried in the
* received PDU are compared with the corresponding operational parameter
* values for the Actor. If one or more of the comparisons shows that the
* value(s) received in the PDU differ from the current operational values,
* then ntt is set to TRUE. Otherwise, ntt remains unchanged.
*/
static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
{
/* validate lacpdu and port */
if (lacpdu && port) {
/* check if any parameter is different then
* update the port->ntt.
*/
if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
(ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
!MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
(ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
(ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
) {
port->ntt = true;
}
}
}
/**
* __agg_ports_are_ready - check if all ports in an aggregator are ready
* @aggregator: the aggregator we're looking at
*
*/
static int __agg_ports_are_ready(struct aggregator *aggregator)
{
struct port *port;
int retval = 1;
if (aggregator) {
/* scan all ports in this aggregator to verfy if they are
* all ready.
*/
for (port = aggregator->lag_ports;
port;
port = port->next_port_in_aggregator) {
if (!(port->sm_vars & AD_PORT_READY_N)) {
retval = 0;
break;
}
}
}
return retval;
}
/**
* __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
* @aggregator: the aggregator we're looking at
* @val: Should the ports' ready bit be set on or off
*
*/
static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
{
struct port *port;
for (port = aggregator->lag_ports; port;
port = port->next_port_in_aggregator) {
if (val)
port->sm_vars |= AD_PORT_READY;
else
port->sm_vars &= ~AD_PORT_READY;
}
}
/**
* __get_agg_bandwidth - get the total bandwidth of an aggregator
* @aggregator: the aggregator we're looking at
*
*/
static u32 __get_agg_bandwidth(struct aggregator *aggregator)
{
u32 bandwidth = 0;
if (aggregator->num_of_ports) {
switch (__get_link_speed(aggregator->lag_ports)) {
case AD_LINK_SPEED_BITMASK_1MBPS:
bandwidth = aggregator->num_of_ports;
break;
case AD_LINK_SPEED_BITMASK_10MBPS:
bandwidth = aggregator->num_of_ports * 10;
break;
case AD_LINK_SPEED_BITMASK_100MBPS:
bandwidth = aggregator->num_of_ports * 100;
break;
case AD_LINK_SPEED_BITMASK_1000MBPS:
bandwidth = aggregator->num_of_ports * 1000;
break;
case AD_LINK_SPEED_BITMASK_10000MBPS:
bandwidth = aggregator->num_of_ports * 10000;
break;
default:
bandwidth = 0; /* to silence the compiler */
}
}
return bandwidth;
}
/**
* __get_active_agg - get the current active aggregator
* @aggregator: the aggregator we're looking at
*
* Caller must hold RCU lock.
*/
static struct aggregator *__get_active_agg(struct aggregator *aggregator)
{
struct bonding *bond = aggregator->slave->bond;
struct list_head *iter;
struct slave *slave;
bond_for_each_slave_rcu(bond, slave, iter)
if (SLAVE_AD_INFO(slave).aggregator.is_active)
return &(SLAVE_AD_INFO(slave).aggregator);
return NULL;
}
/**
* __update_lacpdu_from_port - update a port's lacpdu fields
* @port: the port we're looking at
*/
static inline void __update_lacpdu_from_port(struct port *port)
{
struct lacpdu *lacpdu = &port->lacpdu;
const struct port_params *partner = &port->partner_oper;
/* update current actual Actor parameters
* lacpdu->subtype initialized
* lacpdu->version_number initialized
* lacpdu->tlv_type_actor_info initialized
* lacpdu->actor_information_length initialized
*/
lacpdu->actor_system_priority = htons(port->actor_system_priority);
lacpdu->actor_system = port->actor_system;
lacpdu->actor_key = htons(port->actor_oper_port_key);
lacpdu->actor_port_priority = htons(port->actor_port_priority);
lacpdu->actor_port = htons(port->actor_port_number);
lacpdu->actor_state = port->actor_oper_port_state;
/* lacpdu->reserved_3_1 initialized
* lacpdu->tlv_type_partner_info initialized
* lacpdu->partner_information_length initialized
*/
lacpdu->partner_system_priority = htons(partner->system_priority);
lacpdu->partner_system = partner->system;
lacpdu->partner_key = htons(partner->key);
lacpdu->partner_port_priority = htons(partner->port_priority);
lacpdu->partner_port = htons(partner->port_number);
lacpdu->partner_state = partner->port_state;
/* lacpdu->reserved_3_2 initialized
* lacpdu->tlv_type_collector_info initialized
* lacpdu->collector_information_length initialized
* collector_max_delay initialized
* reserved_12[12] initialized
* tlv_type_terminator initialized
* terminator_length initialized
* reserved_50[50] initialized
*/
}
/* ================= main 802.3ad protocol code ========================= */
/**
* ad_lacpdu_send - send out a lacpdu packet on a given port
* @port: the port we're looking at
*
* Returns: 0 on success
* < 0 on error
*/
static int ad_lacpdu_send(struct port *port)
{
struct slave *slave = port->slave;
struct sk_buff *skb;
struct lacpdu_header *lacpdu_header;
int length = sizeof(struct lacpdu_header);
skb = dev_alloc_skb(length);
if (!skb)
return -ENOMEM;
skb->dev = slave->dev;
skb_reset_mac_header(skb);
skb->network_header = skb->mac_header + ETH_HLEN;
skb->protocol = PKT_TYPE_LACPDU;
skb->priority = TC_PRIO_CONTROL;
lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
/* Note: source address is set to be the member's PERMANENT address,
* because we use it to identify loopback lacpdus in receive.
*/
memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
lacpdu_header->lacpdu = port->lacpdu;
dev_queue_xmit(skb);
return 0;
}
/**
* ad_marker_send - send marker information/response on a given port
* @port: the port we're looking at
* @marker: marker data to send
*
* Returns: 0 on success
* < 0 on error
*/
static int ad_marker_send(struct port *port, struct bond_marker *marker)
{
struct slave *slave = port->slave;
struct sk_buff *skb;
struct bond_marker_header *marker_header;
int length = sizeof(struct bond_marker_header);
skb = dev_alloc_skb(length + 16);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 16);
skb->dev = slave->dev;
skb_reset_mac_header(skb);
skb->network_header = skb->mac_header + ETH_HLEN;
skb->protocol = PKT_TYPE_LACPDU;
marker_header = (struct bond_marker_header *)skb_put(skb, length);
memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
/* Note: source address is set to be the member's PERMANENT address,
* because we use it to identify loopback MARKERs in receive.
*/
memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
marker_header->marker = *marker;
dev_queue_xmit(skb);
return 0;
}
/**
* ad_mux_machine - handle a port's mux state machine
* @port: the port we're looking at
*/
static void ad_mux_machine(struct port *port)
{
mux_states_t last_state;
/* keep current State Machine state to compare later if it was
* changed
*/
last_state = port->sm_mux_state;
if (port->sm_vars & AD_PORT_BEGIN) {
port->sm_mux_state = AD_MUX_DETACHED;
} else {
switch (port->sm_mux_state) {
case AD_MUX_DETACHED:
if ((port->sm_vars & AD_PORT_SELECTED)
|| (port->sm_vars & AD_PORT_STANDBY))
/* if SELECTED or STANDBY */
port->sm_mux_state = AD_MUX_WAITING;
break;
case AD_MUX_WAITING:
/* if SELECTED == FALSE return to DETACH state */
if (!(port->sm_vars & AD_PORT_SELECTED)) {
port->sm_vars &= ~AD_PORT_READY_N;
/* in order to withhold the Selection Logic to
* check all ports READY_N value every callback
* cycle to update ready variable, we check
* READY_N and update READY here
*/
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
port->sm_mux_state = AD_MUX_DETACHED;
break;
}
/* check if the wait_while_timer expired */
if (port->sm_mux_timer_counter
&& !(--port->sm_mux_timer_counter))
port->sm_vars |= AD_PORT_READY_N;
/* in order to withhold the selection logic to check
* all ports READY_N value every callback cycle to
* update ready variable, we check READY_N and update
* READY here
*/
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
/* if the wait_while_timer expired, and the port is
* in READY state, move to ATTACHED state
*/
if ((port->sm_vars & AD_PORT_READY)
&& !port->sm_mux_timer_counter)
port->sm_mux_state = AD_MUX_ATTACHED;
break;
case AD_MUX_ATTACHED:
/* check also if agg_select_timer expired (so the
* edable port will take place only after this timer)
*/
if ((port->sm_vars & AD_PORT_SELECTED) &&
(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
!__check_agg_selection_timer(port)) {
port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
} else if (!(port->sm_vars & AD_PORT_SELECTED) ||
(port->sm_vars & AD_PORT_STANDBY)) {
/* if UNSELECTED or STANDBY */
port->sm_vars &= ~AD_PORT_READY_N;
/* in order to withhold the selection logic to
* check all ports READY_N value every callback
* cycle to update ready variable, we check
* READY_N and update READY here
*/
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
port->sm_mux_state = AD_MUX_DETACHED;
}
break;
case AD_MUX_COLLECTING_DISTRIBUTING:
if (!(port->sm_vars & AD_PORT_SELECTED) ||
(port->sm_vars & AD_PORT_STANDBY) ||
!(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
port->sm_mux_state = AD_MUX_ATTACHED;
} else {
/* if port state hasn't changed make
* sure that a collecting distributing
* port in an active aggregator is enabled
*/
if (port->aggregator &&
port->aggregator->is_active &&
!__port_is_enabled(port)) {
__enable_port(port);
}
}
break;
default:
break;
}
}
/* check if the state machine was changed */
if (port->sm_mux_state != last_state) {
pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_mux_state);
switch (port->sm_mux_state) {
case AD_MUX_DETACHED:
port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
ad_disable_collecting_distributing(port);
port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
port->ntt = true;
break;
case AD_MUX_WAITING:
port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
break;
case AD_MUX_ATTACHED:
port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
ad_disable_collecting_distributing(port);
port->ntt = true;
break;
case AD_MUX_COLLECTING_DISTRIBUTING:
port->actor_oper_port_state |= AD_STATE_COLLECTING;
port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
ad_enable_collecting_distributing(port);
port->ntt = true;
break;
default:
break;
}
}
}
/**
* ad_rx_machine - handle a port's rx State Machine
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* If lacpdu arrived, stop previous timer (if exists) and set the next state as
* CURRENT. If timer expired set the state machine in the proper state.
* In other cases, this function checks if we need to switch to other state.
*/
static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
{
rx_states_t last_state;
/* keep current State Machine state to compare later if it was
* changed
*/
last_state = port->sm_rx_state;
/* check if state machine should change state */
/* first, check if port was reinitialized */
if (port->sm_vars & AD_PORT_BEGIN)
port->sm_rx_state = AD_RX_INITIALIZE;
/* check if port is not enabled */
else if (!(port->sm_vars & AD_PORT_BEGIN)
&& !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
port->sm_rx_state = AD_RX_PORT_DISABLED;
/* check if new lacpdu arrived */
else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
(port->sm_rx_state == AD_RX_DEFAULTED) ||
(port->sm_rx_state == AD_RX_CURRENT))) {
port->sm_rx_timer_counter = 0;
port->sm_rx_state = AD_RX_CURRENT;
} else {
/* if timer is on, and if it is expired */
if (port->sm_rx_timer_counter &&
!(--port->sm_rx_timer_counter)) {
switch (port->sm_rx_state) {
case AD_RX_EXPIRED:
port->sm_rx_state = AD_RX_DEFAULTED;
break;
case AD_RX_CURRENT:
port->sm_rx_state = AD_RX_EXPIRED;
break;
default:
break;
}
} else {
/* if no lacpdu arrived and no timer is on */
switch (port->sm_rx_state) {
case AD_RX_PORT_DISABLED:
if (port->sm_vars & AD_PORT_MOVED)
port->sm_rx_state = AD_RX_INITIALIZE;
else if (port->is_enabled
&& (port->sm_vars
& AD_PORT_LACP_ENABLED))
port->sm_rx_state = AD_RX_EXPIRED;
else if (port->is_enabled
&& ((port->sm_vars
& AD_PORT_LACP_ENABLED) == 0))
port->sm_rx_state = AD_RX_LACP_DISABLED;
break;
default:
break;
}
}
}
/* check if the State machine was changed or new lacpdu arrived */
if ((port->sm_rx_state != last_state) || (lacpdu)) {
pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_rx_state);
switch (port->sm_rx_state) {
case AD_RX_INITIALIZE:
if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
port->sm_vars &= ~AD_PORT_LACP_ENABLED;
else
port->sm_vars |= AD_PORT_LACP_ENABLED;
port->sm_vars &= ~AD_PORT_SELECTED;
__record_default(port);
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
port->sm_vars &= ~AD_PORT_MOVED;
port->sm_rx_state = AD_RX_PORT_DISABLED;
/* Fall Through */
case AD_RX_PORT_DISABLED:
port->sm_vars &= ~AD_PORT_MATCHED;
break;
case AD_RX_LACP_DISABLED:
port->sm_vars &= ~AD_PORT_SELECTED;
__record_default(port);
port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
port->sm_vars |= AD_PORT_MATCHED;
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
case AD_RX_EXPIRED:
/* Reset of the Synchronization flag (Standard 43.4.12)
* This reset cause to disable this port in the
* COLLECTING_DISTRIBUTING state of the mux machine in
* case of EXPIRED even if LINK_DOWN didn't arrive for
* the port.
*/
port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
port->sm_vars &= ~AD_PORT_MATCHED;
port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
port->actor_oper_port_state |= AD_STATE_EXPIRED;
break;
case AD_RX_DEFAULTED:
__update_default_selected(port);
__record_default(port);
port->sm_vars |= AD_PORT_MATCHED;
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
case AD_RX_CURRENT:
/* detect loopback situation */
if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
&(port->actor_system))) {
pr_err("%s: An illegal loopback occurred on adapter (%s).\nCheck the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
port->slave->bond->dev->name,
port->slave->dev->name);
return;
}
__update_selected(lacpdu, port);
__update_ntt(lacpdu, port);
__record_pdu(lacpdu, port);
port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
default:
break;
}
}
}
/**
* ad_tx_machine - handle a port's tx state machine
* @port: the port we're looking at
*/
static void ad_tx_machine(struct port *port)
{
/* check if tx timer expired, to verify that we do not send more than
* 3 packets per second
*/
if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
/* check if there is something to send */
if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
__update_lacpdu_from_port(port);
if (ad_lacpdu_send(port) >= 0) {
pr_debug("Sent LACPDU on port %d\n",
port->actor_port_number);
/* mark ntt as false, so it will not be sent
* again until demanded
*/
port->ntt = false;
}
}
/* restart tx timer(to verify that we will not exceed
* AD_MAX_TX_IN_SECOND
*/
port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
}
}
/**
* ad_periodic_machine - handle a port's periodic state machine
* @port: the port we're looking at
*
* Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
*/
static void ad_periodic_machine(struct port *port)
{
periodic_states_t last_state;
/* keep current state machine state to compare later if it was changed */
last_state = port->sm_periodic_state;
/* check if port was reinitialized */
if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
(!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
) {
port->sm_periodic_state = AD_NO_PERIODIC;
}
/* check if state machine should change state */
else if (port->sm_periodic_timer_counter) {
/* check if periodic state machine expired */
if (!(--port->sm_periodic_timer_counter)) {
/* if expired then do tx */
port->sm_periodic_state = AD_PERIODIC_TX;
} else {
/* If not expired, check if there is some new timeout
* parameter from the partner state
*/
switch (port->sm_periodic_state) {
case AD_FAST_PERIODIC:
if (!(port->partner_oper.port_state
& AD_STATE_LACP_TIMEOUT))
port->sm_periodic_state = AD_SLOW_PERIODIC;
break;
case AD_SLOW_PERIODIC:
if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
port->sm_periodic_timer_counter = 0;
port->sm_periodic_state = AD_PERIODIC_TX;
}
break;
default:
break;
}
}
} else {
switch (port->sm_periodic_state) {
case AD_NO_PERIODIC:
port->sm_periodic_state = AD_FAST_PERIODIC;
break;
case AD_PERIODIC_TX:
if (!(port->partner_oper.port_state &
AD_STATE_LACP_TIMEOUT))
port->sm_periodic_state = AD_SLOW_PERIODIC;
else
port->sm_periodic_state = AD_FAST_PERIODIC;
break;
default:
break;
}
}
/* check if the state machine was changed */
if (port->sm_periodic_state != last_state) {
pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_periodic_state);
switch (port->sm_periodic_state) {
case AD_NO_PERIODIC:
port->sm_periodic_timer_counter = 0;
break;
case AD_FAST_PERIODIC:
/* decrement 1 tick we lost in the PERIODIC_TX cycle */
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
break;
case AD_SLOW_PERIODIC:
/* decrement 1 tick we lost in the PERIODIC_TX cycle */
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
break;
case AD_PERIODIC_TX:
port->ntt = true;
break;
default:
break;
}
}
}
/**
* ad_port_selection_logic - select aggregation groups
* @port: the port we're looking at
*
* Select aggregation groups, and assign each port for it's aggregetor. The
* selection logic is called in the inititalization (after all the handshkes),
* and after every lacpdu receive (if selected is off).
*/
static void ad_port_selection_logic(struct port *port)
{
struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
struct port *last_port = NULL, *curr_port;
struct list_head *iter;
struct bonding *bond;
struct slave *slave;
int found = 0;
/* if the port is already Selected, do nothing */
if (port->sm_vars & AD_PORT_SELECTED)
return;
bond = __get_bond_by_port(port);
/* if the port is connected to other aggregator, detach it */
if (port->aggregator) {
/* detach the port from its former aggregator */
temp_aggregator = port->aggregator;
for (curr_port = temp_aggregator->lag_ports; curr_port;
last_port = curr_port,
curr_port = curr_port->next_port_in_aggregator) {
if (curr_port == port) {
temp_aggregator->num_of_ports--;
/* if it is the first port attached to the
* aggregator
*/
if (!last_port) {
temp_aggregator->lag_ports =
port->next_port_in_aggregator;
} else {
/* not the first port attached to the
* aggregator
*/
last_port->next_port_in_aggregator =
port->next_port_in_aggregator;
}
/* clear the port's relations to this
* aggregator
*/
port->aggregator = NULL;
port->next_port_in_aggregator = NULL;
port->actor_port_aggregator_identifier = 0;
pr_debug("Port %d left LAG %d\n",
port->actor_port_number,
temp_aggregator->aggregator_identifier);
/* if the aggregator is empty, clear its
* parameters, and set it ready to be attached
*/
if (!temp_aggregator->lag_ports)
ad_clear_agg(temp_aggregator);
break;
}
}
if (!curr_port) {
/* meaning: the port was related to an aggregator
* but was not on the aggregator port list
*/
pr_warn("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
port->slave->bond->dev->name,
port->actor_port_number,
port->slave->dev->name,
port->aggregator->aggregator_identifier);
}
}
/* search on all aggregators for a suitable aggregator for this port */
bond_for_each_slave(bond, slave, iter) {
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
/* keep a free aggregator for later use(if needed) */
if (!aggregator->lag_ports) {
if (!free_aggregator)
free_aggregator = aggregator;
continue;
}
/* check if current aggregator suits us */
if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
(aggregator->partner_system_priority == port->partner_oper.system_priority) &&
(aggregator->partner_oper_aggregator_key == port->partner_oper.key)
) &&
((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
!aggregator->is_individual) /* but is not individual OR */
)
) {
/* attach to the founded aggregator */
port->aggregator = aggregator;
port->actor_port_aggregator_identifier =
port->aggregator->aggregator_identifier;
port->next_port_in_aggregator = aggregator->lag_ports;
port->aggregator->num_of_ports++;
aggregator->lag_ports = port;
pr_debug("Port %d joined LAG %d(existing LAG)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
/* mark this port as selected */
port->sm_vars |= AD_PORT_SELECTED;
found = 1;
break;
}
}
/* the port couldn't find an aggregator - attach it to a new
* aggregator
*/
if (!found) {
if (free_aggregator) {
/* assign port a new aggregator */
port->aggregator = free_aggregator;
port->actor_port_aggregator_identifier =
port->aggregator->aggregator_identifier;
/* update the new aggregator's parameters
* if port was responsed from the end-user
*/
if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
/* if port is full duplex */
port->aggregator->is_individual = false;
else
port->aggregator->is_individual = true;
port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
port->aggregator->partner_system =
port->partner_oper.system;
port->aggregator->partner_system_priority =
port->partner_oper.system_priority;
port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
port->aggregator->receive_state = 1;
port->aggregator->transmit_state = 1;
port->aggregator->lag_ports = port;
port->aggregator->num_of_ports++;
/* mark this port as selected */
port->sm_vars |= AD_PORT_SELECTED;
pr_debug("Port %d joined LAG %d(new LAG)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
} else {
pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
port->slave->bond->dev->name,
port->actor_port_number, port->slave->dev->name);
}
}
/* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
* in all aggregator's ports, else set ready=FALSE in all
* aggregator's ports
*/
__set_agg_ports_ready(port->aggregator,
__agg_ports_are_ready(port->aggregator));
aggregator = __get_first_agg(port);
ad_agg_selection_logic(aggregator);
}
/* Decide if "agg" is a better choice for the new active aggregator that
* the current best, according to the ad_select policy.
*/
static struct aggregator *ad_agg_selection_test(struct aggregator *best,
struct aggregator *curr)
{
/* 0. If no best, select current.
*
* 1. If the current agg is not individual, and the best is
* individual, select current.
*
* 2. If current agg is individual and the best is not, keep best.
*
* 3. Therefore, current and best are both individual or both not
* individual, so:
*
* 3a. If current agg partner replied, and best agg partner did not,
* select current.
*
* 3b. If current agg partner did not reply and best agg partner
* did reply, keep best.
*
* 4. Therefore, current and best both have partner replies or
* both do not, so perform selection policy:
*
* BOND_AD_COUNT: Select by count of ports. If count is equal,
* select by bandwidth.
*
* BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
*/
if (!best)
return curr;
if (!curr->is_individual && best->is_individual)
return curr;
if (curr->is_individual && !best->is_individual)
return best;
if (__agg_has_partner(curr) && !__agg_has_partner(best))
return curr;
if (!__agg_has_partner(curr) && __agg_has_partner(best))
return best;
switch (__get_agg_selection_mode(curr->lag_ports)) {
case BOND_AD_COUNT:
if (curr->num_of_ports > best->num_of_ports)
return curr;
if (curr->num_of_ports < best->num_of_ports)
return best;
/*FALLTHROUGH*/
case BOND_AD_STABLE:
case BOND_AD_BANDWIDTH:
if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
return curr;
break;
default:
pr_warn("%s: Impossible agg select mode %d\n",
curr->slave->bond->dev->name,
__get_agg_selection_mode(curr->lag_ports));
break;
}
return best;
}
static int agg_device_up(const struct aggregator *agg)
{
struct port *port = agg->lag_ports;
if (!port)
return 0;
return netif_running(port->slave->dev) &&
netif_carrier_ok(port->slave->dev);
}
/**
* ad_agg_selection_logic - select an aggregation group for a team
* @aggregator: the aggregator we're looking at
*
* It is assumed that only one aggregator may be selected for a team.
*
* The logic of this function is to select the aggregator according to
* the ad_select policy:
*
* BOND_AD_STABLE: select the aggregator with the most ports attached to
* it, and to reselect the active aggregator only if the previous
* aggregator has no more ports related to it.
*
* BOND_AD_BANDWIDTH: select the aggregator with the highest total
* bandwidth, and reselect whenever a link state change takes place or the
* set of slaves in the bond changes.
*
* BOND_AD_COUNT: select the aggregator with largest number of ports
* (slaves), and reselect whenever a link state change takes place or the
* set of slaves in the bond changes.
*
* FIXME: this function MUST be called with the first agg in the bond, or
* __get_active_agg() won't work correctly. This function should be better
* called with the bond itself, and retrieve the first agg from it.
*/
static void ad_agg_selection_logic(struct aggregator *agg)
{
struct aggregator *best, *active, *origin;
struct bonding *bond = agg->slave->bond;
struct list_head *iter;
struct slave *slave;
struct port *port;
rcu_read_lock();
origin = agg;
active = __get_active_agg(agg);
best = (active && agg_device_up(active)) ? active : NULL;
bond_for_each_slave_rcu(bond, slave, iter) {
agg = &(SLAVE_AD_INFO(slave).aggregator);
agg->is_active = 0;
if (agg->num_of_ports && agg_device_up(agg))
best = ad_agg_selection_test(best, agg);
}
if (best &&
__get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
/* For the STABLE policy, don't replace the old active
* aggregator if it's still active (it has an answering
* partner) or if both the best and active don't have an
* answering partner.
*/
if (active && active->lag_ports &&
active->lag_ports->is_enabled &&
(__agg_has_partner(active) ||
(!__agg_has_partner(active) &&
!__agg_has_partner(best)))) {
if (!(!active->actor_oper_aggregator_key &&
best->actor_oper_aggregator_key)) {
best = NULL;
active->is_active = 1;
}
}
}
if (best && (best == active)) {
best = NULL;
active->is_active = 1;
}
/* if there is new best aggregator, activate it */
if (best) {
pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
best->aggregator_identifier, best->num_of_ports,
best->actor_oper_aggregator_key,
best->partner_oper_aggregator_key,
best->is_individual, best->is_active);
pr_debug("best ports %p slave %p %s\n",
best->lag_ports, best->slave,
best->slave ? best->slave->dev->name : "NULL");
bond_for_each_slave_rcu(bond, slave, iter) {
agg = &(SLAVE_AD_INFO(slave).aggregator);
pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
agg->aggregator_identifier, agg->num_of_ports,
agg->actor_oper_aggregator_key,
agg->partner_oper_aggregator_key,
agg->is_individual, agg->is_active);
}
/* check if any partner replys */
if (best->is_individual) {
pr_warn("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
best->slave ?
best->slave->bond->dev->name : "NULL");
}
best->is_active = 1;
pr_debug("LAG %d chosen as the active LAG\n",
best->aggregator_identifier);
pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
best->aggregator_identifier, best->num_of_ports,
best->actor_oper_aggregator_key,
best->partner_oper_aggregator_key,
best->is_individual, best->is_active);
/* disable the ports that were related to the former
* active_aggregator
*/
if (active) {
for (port = active->lag_ports; port;
port = port->next_port_in_aggregator) {
__disable_port(port);
}
}
}
/* if the selected aggregator is of join individuals
* (partner_system is NULL), enable their ports
*/
active = __get_active_agg(origin);
if (active) {
if (!__agg_has_partner(active)) {
for (port = active->lag_ports; port;
port = port->next_port_in_aggregator) {
__enable_port(port);
}
}
}
rcu_read_unlock();
bond_3ad_set_carrier(bond);
}
/**
* ad_clear_agg - clear a given aggregator's parameters
* @aggregator: the aggregator we're looking at
*/
static void ad_clear_agg(struct aggregator *aggregator)
{
if (aggregator) {
aggregator->is_individual = false;
aggregator->actor_admin_aggregator_key = 0;
aggregator->actor_oper_aggregator_key = 0;
aggregator->partner_system = null_mac_addr;
aggregator->partner_system_priority = 0;
aggregator->partner_oper_aggregator_key = 0;
aggregator->receive_state = 0;
aggregator->transmit_state = 0;
aggregator->lag_ports = NULL;
aggregator->is_active = 0;
aggregator->num_of_ports = 0;
pr_debug("LAG %d was cleared\n",
aggregator->aggregator_identifier);
}
}
/**
* ad_initialize_agg - initialize a given aggregator's parameters
* @aggregator: the aggregator we're looking at
*/
static void ad_initialize_agg(struct aggregator *aggregator)
{
if (aggregator) {
ad_clear_agg(aggregator);
aggregator->aggregator_mac_address = null_mac_addr;
aggregator->aggregator_identifier = 0;
aggregator->slave = NULL;
}
}
/**
* ad_initialize_port - initialize a given port's parameters
* @aggregator: the aggregator we're looking at
* @lacp_fast: boolean. whether fast periodic should be used
*/
static void ad_initialize_port(struct port *port, int lacp_fast)
{
static const struct port_params tmpl = {
.system_priority = 0xffff,
.key = 1,
.port_number = 1,
.port_priority = 0xff,
.port_state = 1,
};
static const struct lacpdu lacpdu = {
.subtype = 0x01,
.version_number = 0x01,
.tlv_type_actor_info = 0x01,
.actor_information_length = 0x14,
.tlv_type_partner_info = 0x02,
.partner_information_length = 0x14,
.tlv_type_collector_info = 0x03,
.collector_information_length = 0x10,
.collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
};
if (port) {
port->actor_port_number = 1;
port->actor_port_priority = 0xff;
port->actor_system = null_mac_addr;
port->actor_system_priority = 0xffff;
port->actor_port_aggregator_identifier = 0;
port->ntt = false;
port->actor_admin_port_key = 1;
port->actor_oper_port_key = 1;
port->actor_admin_port_state = AD_STATE_AGGREGATION |
AD_STATE_LACP_ACTIVITY;
port->actor_oper_port_state = AD_STATE_AGGREGATION |
AD_STATE_LACP_ACTIVITY;
if (lacp_fast)
port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
port->is_enabled = true;
/* private parameters */
port->sm_vars = 0x3;
port->sm_rx_state = 0;
port->sm_rx_timer_counter = 0;
port->sm_periodic_state = 0;
port->sm_periodic_timer_counter = 0;
port->sm_mux_state = 0;
port->sm_mux_timer_counter = 0;
port->sm_tx_state = 0;
port->sm_tx_timer_counter = 0;
port->slave = NULL;
port->aggregator = NULL;
port->next_port_in_aggregator = NULL;
port->transaction_id = 0;
memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
}
}
/**
* ad_enable_collecting_distributing - enable a port's transmit/receive
* @port: the port we're looking at
*
* Enable @port if it's in an active aggregator
*/
static void ad_enable_collecting_distributing(struct port *port)
{
if (port->aggregator->is_active) {
pr_debug("Enabling port %d(LAG %d)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
__enable_port(port);
}
}
/**
* ad_disable_collecting_distributing - disable a port's transmit/receive
* @port: the port we're looking at
*/
static void ad_disable_collecting_distributing(struct port *port)
{
if (port->aggregator &&
!MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
&(null_mac_addr))) {
pr_debug("Disabling port %d(LAG %d)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
__disable_port(port);
}
}
/**
* ad_marker_info_received - handle receive of a Marker information frame
* @marker_info: Marker info received
* @port: the port we're looking at
*/
static void ad_marker_info_received(struct bond_marker *marker_info,
struct port *port)
{
struct bond_marker marker;
/* copy the received marker data to the response marker */
memcpy(&marker, marker_info, sizeof(struct bond_marker));
/* change the marker subtype to marker response */
marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
/* send the marker response */
if (ad_marker_send(port, &marker) >= 0) {
pr_debug("Sent Marker Response on port %d\n",
port->actor_port_number);
}
}
/**
* ad_marker_response_received - handle receive of a marker response frame
* @marker: marker PDU received
* @port: the port we're looking at
*
* This function does nothing since we decided not to implement send and handle
* response for marker PDU's, in this stage, but only to respond to marker
* information.
*/
static void ad_marker_response_received(struct bond_marker *marker,
struct port *port)
{
marker = NULL;
port = NULL;
/* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
}
/* ========= AD exported functions to the main bonding code ========= */
/* Check aggregators status in team every T seconds */
#define AD_AGGREGATOR_SELECTION_TIMER 8
/**
* bond_3ad_initiate_agg_selection - initate aggregator selection
* @bond: bonding struct
*
* Set the aggregation selection timer, to initiate an agg selection in
* the very near future. Called during first initialization, and during
* any down to up transitions of the bond.
*/
void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
{
BOND_AD_INFO(bond).agg_select_timer = timeout;
}
static u16 aggregator_identifier;
/**
* bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
* @bond: bonding struct to work on
* @tick_resolution: tick duration (millisecond resolution)
*
* Can be called only after the mac address of the bond is set.
*/
void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
{
/* check that the bond is not initialized yet */
if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
bond->dev->dev_addr)) {
aggregator_identifier = 0;
BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
/* initialize how many times this module is called in one
* second (should be about every 100ms)
*/
ad_ticks_per_sec = tick_resolution;
bond_3ad_initiate_agg_selection(bond,
AD_AGGREGATOR_SELECTION_TIMER *
ad_ticks_per_sec);
}
}
/**
* bond_3ad_bind_slave - initialize a slave's port
* @slave: slave struct to work on
*
* Returns: 0 on success
* < 0 on error
*/
void bond_3ad_bind_slave(struct slave *slave)
{
struct bonding *bond = bond_get_bond_by_slave(slave);
struct port *port;
struct aggregator *aggregator;
/* check that the slave has not been initialized yet. */
if (SLAVE_AD_INFO(slave).port.slave != slave) {
/* port initialization */
port = &(SLAVE_AD_INFO(slave).port);
ad_initialize_port(port, bond->params.lacp_fast);
__initialize_port_locks(slave);
port->slave = slave;
port->actor_port_number = SLAVE_AD_INFO(slave).id;
/* key is determined according to the link speed, duplex and user key(which
* is yet not supported)
*/
port->actor_admin_port_key = 0;
port->actor_admin_port_key |= __get_duplex(port);
port->actor_admin_port_key |= (__get_link_speed(port) << 1);
port->actor_oper_port_key = port->actor_admin_port_key;
/* if the port is not full duplex, then the port should be not
* lacp Enabled
*/
if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
port->sm_vars &= ~AD_PORT_LACP_ENABLED;
/* actor system is the bond's system */
port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
/* tx timer(to verify that no more than MAX_TX_IN_SECOND
* lacpdu's are sent in one second)
*/
port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
port->aggregator = NULL;
port->next_port_in_aggregator = NULL;
__disable_port(port);
/* aggregator initialization */
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
ad_initialize_agg(aggregator);
aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
aggregator->aggregator_identifier = (++aggregator_identifier);
aggregator->slave = slave;
aggregator->is_active = 0;
aggregator->num_of_ports = 0;
}
}
/**
* bond_3ad_unbind_slave - deinitialize a slave's port
* @slave: slave struct to work on
*
* Search for the aggregator that is related to this port, remove the
* aggregator and assign another aggregator for other port related to it
* (if any), and remove the port.
*/
void bond_3ad_unbind_slave(struct slave *slave)
{
struct port *port, *prev_port, *temp_port;
struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
int select_new_active_agg = 0;
struct bonding *bond = slave->bond;
struct slave *slave_iter;
struct list_head *iter;
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
pr_debug("Unbinding Link Aggregation Group %d\n",
aggregator->aggregator_identifier);
/* Tell the partner that this port is not suitable for aggregation */
port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
__update_lacpdu_from_port(port);
ad_lacpdu_send(port);
/* check if this aggregator is occupied */
if (aggregator->lag_ports) {
/* check if there are other ports related to this aggregator
* except the port related to this slave(thats ensure us that
* there is a reason to search for new aggregator, and that we
* will find one
*/
if ((aggregator->lag_ports != port) ||
(aggregator->lag_ports->next_port_in_aggregator)) {
/* find new aggregator for the related port(s) */
bond_for_each_slave(bond, slave_iter, iter) {
new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
/* if the new aggregator is empty, or it is
* connected to our port only
*/
if (!new_aggregator->lag_ports ||
((new_aggregator->lag_ports == port) &&
!new_aggregator->lag_ports->next_port_in_aggregator))
break;
}
if (!slave_iter)
new_aggregator = NULL;
/* if new aggregator found, copy the aggregator's
* parameters and connect the related lag_ports to the
* new aggregator
*/
if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
aggregator->aggregator_identifier,
new_aggregator->aggregator_identifier);
if ((new_aggregator->lag_ports == port) &&
new_aggregator->is_active) {
pr_info("%s: Removing an active aggregator\n",
aggregator->slave->bond->dev->name);
select_new_active_agg = 1;
}
new_aggregator->is_individual = aggregator->is_individual;
new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
new_aggregator->partner_system = aggregator->partner_system;
new_aggregator->partner_system_priority = aggregator->partner_system_priority;
new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
new_aggregator->receive_state = aggregator->receive_state;
new_aggregator->transmit_state = aggregator->transmit_state;
new_aggregator->lag_ports = aggregator->lag_ports;
new_aggregator->is_active = aggregator->is_active;
new_aggregator->num_of_ports = aggregator->num_of_ports;
/* update the information that is written on
* the ports about the aggregator
*/
for (temp_port = aggregator->lag_ports; temp_port;
temp_port = temp_port->next_port_in_aggregator) {
temp_port->aggregator = new_aggregator;
temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
}
ad_clear_agg(aggregator);
if (select_new_active_agg)
ad_agg_selection_logic(__get_first_agg(port));
} else {
pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
slave->bond->dev->name);
}
} else {
/* in case that the only port related to this
* aggregator is the one we want to remove
*/
select_new_active_agg = aggregator->is_active;
ad_clear_agg(aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->bond->dev->name);
/* select new active aggregator */
temp_aggregator = __get_first_agg(port);
if (temp_aggregator)
ad_agg_selection_logic(temp_aggregator);
}
}
}
pr_debug("Unbinding port %d\n", port->actor_port_number);
/* find the aggregator that this port is connected to */
bond_for_each_slave(bond, slave_iter, iter) {
temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
prev_port = NULL;
/* search the port in the aggregator's related ports */
for (temp_port = temp_aggregator->lag_ports; temp_port;
prev_port = temp_port,
temp_port = temp_port->next_port_in_aggregator) {
if (temp_port == port) {
/* the aggregator found - detach the port from
* this aggregator
*/
if (prev_port)
prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
else
temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
temp_aggregator->num_of_ports--;
if (temp_aggregator->num_of_ports == 0) {
select_new_active_agg = temp_aggregator->is_active;
ad_clear_agg(temp_aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->bond->dev->name);
/* select new active aggregator */
ad_agg_selection_logic(__get_first_agg(port));
}
}
break;
}
}
}
port->slave = NULL;
}
/**
* bond_3ad_state_machine_handler - handle state machines timeout
* @bond: bonding struct to work on
*
* The state machine handling concept in this module is to check every tick
* which state machine should operate any function. The execution order is
* round robin, so when we have an interaction between state machines, the
* reply of one to each other might be delayed until next tick.
*
* This function also complete the initialization when the agg_select_timer
* times out, and it selects an aggregator for the ports that are yet not
* related to any aggregator, and selects the active aggregator for a bond.
*/
void bond_3ad_state_machine_handler(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
ad_work.work);
struct aggregator *aggregator;
struct list_head *iter;
struct slave *slave;
struct port *port;
read_lock(&bond->lock);
rcu_read_lock();
/* check if there are any slaves */
if (!bond_has_slaves(bond))
goto re_arm;
/* check if agg_select_timer timer after initialize is timed out */
if (BOND_AD_INFO(bond).agg_select_timer &&
!(--BOND_AD_INFO(bond).agg_select_timer)) {
slave = bond_first_slave_rcu(bond);
port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
/* select the active aggregator for the bond */
if (port) {
if (!port->slave) {
pr_warn("%s: Warning: bond's first port is uninitialized\n",
bond->dev->name);
goto re_arm;
}
aggregator = __get_first_agg(port);
ad_agg_selection_logic(aggregator);
}
bond_3ad_set_carrier(bond);
}
/* for each port run the state machines */
bond_for_each_slave_rcu(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
if (!port->slave) {
pr_warn("%s: Warning: Found an uninitialized port\n",
bond->dev->name);
goto re_arm;
}
/* Lock around state machines to protect data accessed
* by all (e.g., port->sm_vars). ad_rx_machine may run
* concurrently due to incoming LACPDU.
*/
__get_state_machine_lock(port);
ad_rx_machine(NULL, port);
ad_periodic_machine(port);
ad_port_selection_logic(port);
ad_mux_machine(port);
ad_tx_machine(port);
/* turn off the BEGIN bit, since we already handled it */
if (port->sm_vars & AD_PORT_BEGIN)
port->sm_vars &= ~AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
re_arm:
rcu_read_unlock();
read_unlock(&bond->lock);
queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
}
/**
* bond_3ad_rx_indication - handle a received frame
* @lacpdu: received lacpdu
* @slave: slave struct to work on
* @length: length of the data received
*
* It is assumed that frames that were sent on this NIC don't returned as new
* received frames (loopback). Since only the payload is given to this
* function, it check for loopback.
*/
static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
u16 length)
{
struct port *port;
int ret = RX_HANDLER_ANOTHER;
if (length >= sizeof(struct lacpdu)) {
port = &(SLAVE_AD_INFO(slave).port);
if (!port->slave) {
pr_warn("%s: Warning: port of slave %s is uninitialized\n",
slave->dev->name, slave->bond->dev->name);
return ret;
}
switch (lacpdu->subtype) {
case AD_TYPE_LACPDU:
ret = RX_HANDLER_CONSUMED;
pr_debug("Received LACPDU on port %d\n",
port->actor_port_number);
/* Protect against concurrent state machines */
__get_state_machine_lock(port);
ad_rx_machine(lacpdu, port);
__release_state_machine_lock(port);
break;
case AD_TYPE_MARKER:
ret = RX_HANDLER_CONSUMED;
/* No need to convert fields to Little Endian since we
* don't use the marker's fields.
*/
switch (((struct bond_marker *)lacpdu)->tlv_type) {
case AD_MARKER_INFORMATION_SUBTYPE:
pr_debug("Received Marker Information on port %d\n",
port->actor_port_number);
ad_marker_info_received((struct bond_marker *)lacpdu, port);
break;
case AD_MARKER_RESPONSE_SUBTYPE:
pr_debug("Received Marker Response on port %d\n",
port->actor_port_number);
ad_marker_response_received((struct bond_marker *)lacpdu, port);
break;
default:
pr_debug("Received an unknown Marker subtype on slot %d\n",
port->actor_port_number);
}
}
}
return ret;
}
/**
* bond_3ad_adapter_speed_changed - handle a slave's speed change indication
* @slave: slave struct to work on
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_adapter_speed_changed(struct slave *slave)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
(__get_link_speed(port) << 1);
pr_debug("Port %d changed speed\n", port->actor_port_number);
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/**
* bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
* @slave: slave struct to work on
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_adapter_duplex_changed(struct slave *slave)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
__get_duplex(port);
pr_debug("Port %d changed duplex\n", port->actor_port_number);
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/**
* bond_3ad_handle_link_change - handle a slave's link status change indication
* @slave: slave struct to work on
* @status: whether the link is now up or down
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_handle_link_change(struct slave *slave, char link)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
/* on link down we are zeroing duplex and speed since
* some of the adaptors(ce1000.lan) report full duplex/speed
* instead of N/A(duplex) / 0(speed).
*
* on link up we are forcing recheck on the duplex and speed since
* some of he adaptors(ce1000.lan) report.
*/
if (link == BOND_LINK_UP) {
port->is_enabled = true;
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
__get_duplex(port);
port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
(__get_link_speed(port) << 1);
} else {
/* link has failed */
port->is_enabled = false;
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = (port->actor_admin_port_key &=
~AD_SPEED_KEY_BITS);
}
pr_debug("Port %d changed link status to %s",
port->actor_port_number,
(link == BOND_LINK_UP) ? "UP" : "DOWN");
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/**
* bond_3ad_set_carrier - set link state for bonding master
* @bond - bonding structure
*
* if we have an active aggregator, we're up, if not, we're down.
* Presumes that we cannot have an active aggregator if there are
* no slaves with link up.
*
* This behavior complies with IEEE 802.3 section 43.3.9.
*
* Called by bond_set_carrier(). Return zero if carrier state does not
* change, nonzero if it does.
*/
int bond_3ad_set_carrier(struct bonding *bond)
{
struct aggregator *active;
struct slave *first_slave;
int ret = 1;
rcu_read_lock();
first_slave = bond_first_slave_rcu(bond);
if (!first_slave) {
ret = 0;
goto out;
}
active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
if (active) {
/* are enough slaves available to consider link up? */
if (active->num_of_ports < bond->params.min_links) {
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
goto out;
}
} else if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
goto out;
}
} else if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
}
out:
rcu_read_unlock();
return ret;
}
/**
* __bond_3ad_get_active_agg_info - get information of the active aggregator
* @bond: bonding struct to work on
* @ad_info: ad_info struct to fill with the bond's info
*
* Returns: 0 on success
* < 0 on error
*/
int __bond_3ad_get_active_agg_info(struct bonding *bond,
struct ad_info *ad_info)
{
struct aggregator *aggregator = NULL;
struct list_head *iter;
struct slave *slave;
struct port *port;
bond_for_each_slave_rcu(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
if (port->aggregator && port->aggregator->is_active) {
aggregator = port->aggregator;
break;
}
}
if (aggregator) {
ad_info->aggregator_id = aggregator->aggregator_identifier;
ad_info->ports = aggregator->num_of_ports;
ad_info->actor_key = aggregator->actor_oper_aggregator_key;
ad_info->partner_key = aggregator->partner_oper_aggregator_key;
memcpy(ad_info->partner_system,
aggregator->partner_system.mac_addr_value, ETH_ALEN);
return 0;
}
return -1;
}
/* Wrapper used to hold bond->lock so no slave manipulation can occur */
int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
{
int ret;
rcu_read_lock();
ret = __bond_3ad_get_active_agg_info(bond, ad_info);
rcu_read_unlock();
return ret;
}
int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = netdev_priv(dev);
struct slave *slave, *first_ok_slave;
struct aggregator *agg;
struct ad_info ad_info;
struct list_head *iter;
int slaves_in_agg;
int slave_agg_no;
int agg_id;
if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
dev->name);
goto err_free;
}
slaves_in_agg = ad_info.ports;
agg_id = ad_info.aggregator_id;
if (slaves_in_agg == 0) {
pr_debug("%s: Error: active aggregator is empty\n", dev->name);
goto err_free;
}
slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
first_ok_slave = NULL;
bond_for_each_slave_rcu(bond, slave, iter) {
agg = SLAVE_AD_INFO(slave).port.aggregator;
if (!agg || agg->aggregator_identifier != agg_id)
continue;
if (slave_agg_no >= 0) {
if (!first_ok_slave && SLAVE_IS_OK(slave))
first_ok_slave = slave;
slave_agg_no--;
continue;
}
if (SLAVE_IS_OK(slave)) {
bond_dev_queue_xmit(bond, skb, slave->dev);
goto out;
}
}
if (slave_agg_no >= 0) {
pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
dev->name, agg_id);
goto err_free;
}
/* we couldn't find any suitable slave after the agg_no, so use the
* first suitable found, if found.
*/
if (first_ok_slave)
bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
else
goto err_free;
out:
return NETDEV_TX_OK;
err_free:
/* no suitable interface, frame not sent */
kfree_skb(skb);
goto out;
}
int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
int ret = RX_HANDLER_ANOTHER;
struct lacpdu *lacpdu, _lacpdu;
if (skb->protocol != PKT_TYPE_LACPDU)
return ret;
lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
if (!lacpdu)
return ret;
read_lock(&bond->lock);
ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
read_unlock(&bond->lock);
return ret;
}
/**
* bond_3ad_update_lacp_rate - change the lacp rate
* @bond - bonding struct
*
* When modify lacp_rate parameter via sysfs,
* update actor_oper_port_state of each port.
*
* Hold slave->state_machine_lock,
* so we can modify port->actor_oper_port_state,
* no matter bond is up or down.
*/
void bond_3ad_update_lacp_rate(struct bonding *bond)
{
struct port *port = NULL;
struct list_head *iter;
struct slave *slave;
int lacp_fast;
lacp_fast = bond->params.lacp_fast;
bond_for_each_slave(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
__get_state_machine_lock(port);
if (lacp_fast)
port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
else
port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
__release_state_machine_lock(port);
}
}
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