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linux/drivers/net/bonding/bond_3ad.c
Jay Vosburgh e6d265e850 bonding: eliminate bond_close race conditions 
This patch resolves two sets of race conditions.

	Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> reported the
first, as follows:

The bond_close() calls cancel_delayed_work() to cancel delayed works.
It, however, cannot cancel works that were already queued in workqueue.
The bond_open() initializes work->data, and proccess_one_work() refers
get_work_cwq(work)->wq->flags. The get_work_cwq() returns NULL when
work->data has been initialized. Thus, a panic occurs.

	He included a patch that converted the cancel_delayed_work calls
in bond_close to flush_delayed_work_sync, which eliminated the above
problem.

	His patch is incorporated, at least in principle, into this
patch.  In this patch, we use cancel_delayed_work_sync in place of
flush_delayed_work_sync, and also convert bond_uninit in addition to
bond_close.

	This conversion to _sync, however, opens new races between
bond_close and three periodically executing workqueue functions:
bond_mii_monitor, bond_alb_monitor and bond_activebackup_arp_mon.

	The race occurs because bond_close and bond_uninit are always
called with RTNL held, and these workqueue functions may acquire RTNL to
perform failover-related activities.  If bond_close or bond_uninit is
waiting in cancel_delayed_work_sync, deadlock occurs.

	These deadlocks are resolved by having the workqueue functions
acquire RTNL conditionally.  If the rtnl_trylock() fails, the functions
reschedule and return immediately.  For the cases that are attempting to
perform link failover, a delay of 1 is used; for the other cases, the
normal interval is used (as those activities are not as time critical).

	Additionally, the bond_mii_monitor function now stores the delay
in a variable (mimicing the structure of activebackup_arp_mon).

	Lastly, all of the above renders the kill_timers sentinel moot,
and therefore it has been removed.

Tested-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-10-30 03:13:14 -04:00

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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
//dalloun
#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
//endalloun
// compare MAC addresses
#define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
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_port - get the first port in the bond
* @bond: the bond we're looking at
*
* Return the port of the first slave in @bond, or %NULL if it can't be found.
*/
static inline struct port *__get_first_port(struct bonding *bond)
{
if (bond->slave_cnt == 0)
return NULL;
return &(SLAVE_AD_INFO(bond->first_slave).port);
}
/**
* __get_next_port - get the next port in the bond
* @port: the port we're looking at
*
* Return the port of the slave that is next in line of @port's slave in the
* bond, or %NULL if it can't be found.
*/
static inline struct port *__get_next_port(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
struct slave *slave = port->slave;
// If there's no bond for this port, or this is the last slave
if ((bond == NULL) || (slave->next == bond->first_slave))
return NULL;
return &(SLAVE_AD_INFO(slave->next).port);
}
/**
* __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.
*/
static inline struct aggregator *__get_first_agg(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
// If there's no bond for this port, or bond has no slaves
if ((bond == NULL) || (bond->slave_cnt == 0))
return NULL;
return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
}
/**
* __get_next_agg - get the next aggregator in the bond
* @aggregator: the aggregator we're looking at
*
* Return the aggregator of the slave that is next in line of @aggregator's
* slave in the bond, or %NULL if it can't be found.
*/
static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
{
struct slave *slave = aggregator->slave;
struct bonding *bond = bond_get_bond_by_slave(slave);
// If there's no bond for this aggregator, or this is the last slave
if ((bond == NULL) || (slave->next == bond->first_slave))
return NULL;
return &(SLAVE_AD_INFO(slave->next).aggregator);
}
/*
* __agg_has_partner
*
* 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:
speed = 0; // unknown speed value from ethtool. shouldn't happen
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 port we're looking at
*
*/
static inline void __initialize_port_locks(struct port *port)
{
// make sure it isn't called twice
spin_lock_init(&(SLAVE_AD_INFO(port->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); // short timeout
else
retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
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
if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
(ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
!MAC_ADDRESS_COMPARE(&(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))) ||
// or this is individual link(aggregation == FALSE)
((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
) {
// update the state machine Matched variable
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
if (ntohs(lacpdu->actor_port) != partner->port_number ||
ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
MAC_ADDRESS_COMPARE(&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)) {
// update the state machine Selected variable
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
if (admin->port_number != oper->port_number ||
admin->port_priority != oper->port_priority ||
MAC_ADDRESS_COMPARE(&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)) {
// update the state machine Selected variable
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
if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
(ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
MAC_ADDRESS_COMPARE(&(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;
}
}
}
/**
* __attach_bond_to_agg
* @port: the port we're looking at
*
* Handle the attaching of the port's control parser/multiplexer and the
* aggregator. This function does nothing since the parser/multiplexer of the
* receive and the parser/multiplexer of the aggregator are already combined.
*/
static void __attach_bond_to_agg(struct port *port)
{
port = NULL; /* just to satisfy the compiler */
// This function does nothing since the parser/multiplexer of the receive
// and the parser/multiplexer of the aggregator are already combined
}
/**
* __detach_bond_from_agg
* @port: the port we're looking at
*
* Handle the detaching of the port's control parser/multiplexer from the
* aggregator. This function does nothing since the parser/multiplexer of the
* receive and the parser/multiplexer of the aggregator are already combined.
*/
static void __detach_bond_from_agg(struct port *port)
{
port = NULL; /* just to satisfy the compiler */
// This function does nothing sience the parser/multiplexer of the receive
// and the parser/multiplexer of the aggregator are already combined
}
/**
* __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
*
*/
static struct aggregator *__get_active_agg(struct aggregator *aggregator)
{
struct aggregator *retval = NULL;
for (; aggregator; aggregator = __get_next_agg(aggregator)) {
if (aggregator->is_active) {
retval = aggregator;
break;
}
}
return retval;
}
/**
* __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; // struct copy
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; // struct copy
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; // next state
} 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; // next state
break;
case AD_MUX_WAITING:
// if SELECTED == FALSE return to DETACH state
if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
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; // next state
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; // next state
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;// next state
} 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;// next state
}
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;// next state
} 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: //to silence the compiler
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:
__detach_bond_from_agg(port);
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:
__attach_bond_to_agg(port);
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: //to silence the compiler
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)
/* next state */
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))
/* next state */
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; // zero timer
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; // next state
break;
case AD_RX_CURRENT:
port->sm_rx_state = AD_RX_EXPIRED; // next state
break;
default: //to silence the compiler
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; // next state
else if (port->is_enabled
&& (port->sm_vars
& AD_PORT_LACP_ENABLED))
port->sm_rx_state = AD_RX_EXPIRED; // next state
else if (port->is_enabled
&& ((port->sm_vars
& AD_PORT_LACP_ENABLED) == 0))
port->sm_rx_state = AD_RX_LACP_DISABLED; // next state
break;
default: //to silence the compiler
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; // next state
/*- 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_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
// INFO_RECEIVED_LOOPBACK_FRAMES
pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
"Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
port->slave->dev->master->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: //to silence the compiler
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; // next state
}
// 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; // next state
} 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; // next state
break;
case AD_SLOW_PERIODIC:
if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
// stop current timer
port->sm_periodic_timer_counter = 0;
port->sm_periodic_state = AD_PERIODIC_TX; // next state
}
break;
default: //to silence the compiler
break;
}
}
} else {
switch (port->sm_periodic_state) {
case AD_NO_PERIODIC:
port->sm_periodic_state = AD_FAST_PERIODIC; // next state
break;
case AD_PERIODIC_TX:
if (!(port->partner_oper.port_state
& AD_STATE_LACP_TIMEOUT))
port->sm_periodic_state = AD_SLOW_PERIODIC; // next state
else
port->sm_periodic_state = AD_FAST_PERIODIC; // next state
break;
default: //to silence the compiler
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; // zero timer
break;
case AD_FAST_PERIODIC:
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
break;
case AD_SLOW_PERIODIC:
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
break;
case AD_PERIODIC_TX:
port->ntt = true;
break;
default: //to silence the compiler
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;
int found = 0;
// if the port is already Selected, do nothing
if (port->sm_vars & AD_PORT_SELECTED)
return;
// 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 (!last_port) {// if it is the first port attached to the aggregator
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_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
port->slave->dev->master->name,
port->actor_port_number,
port->slave->dev->name,
port->aggregator->aggregator_identifier);
}
}
// search on all aggregators for a suitable aggregator for this port
for (aggregator = __get_first_agg(port); aggregator;
aggregator = __get_next_agg(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_COMPARE(&(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_COMPARE(&(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->dev->master->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_warning("%s: Impossible agg select mode %d\n",
curr->slave->dev->master->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 port *port;
origin = agg;
active = __get_active_agg(agg);
best = (active && agg_device_up(active)) ? active : NULL;
do {
agg->is_active = 0;
if (agg->num_of_ports && agg_device_up(agg))
best = ad_agg_selection_test(best, agg);
} while ((agg = __get_next_agg(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");
for (agg = __get_first_agg(best->lag_ports); agg;
agg = __get_next_agg(agg)) {
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_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
best->slave ? best->slave->dev->master->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);
}
}
}
if (origin->slave) {
struct bonding *bond;
bond = bond_get_bond_by_slave(origin->slave);
if (bond)
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_COMPARE(&(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);
}
}
#if 0
/**
* ad_marker_info_send - send a marker information frame
* @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_info_send(struct port *port)
{
struct bond_marker marker;
u16 index;
// fill the marker PDU with the appropriate values
marker.subtype = 0x02;
marker.version_number = 0x01;
marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
marker.marker_length = 0x16;
// convert requester_port to Big Endian
marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
marker.requester_system = port->actor_system;
// convert requester_port(u32) to Big Endian
marker.requester_transaction_id =
(((++port->transaction_id & 0xFF) << 24)
| ((port->transaction_id & 0xFF00) << 8)
| ((port->transaction_id & 0xFF0000) >> 8)
| ((port->transaction_id & 0xFF000000) >> 24));
marker.pad = 0;
marker.tlv_type_terminator = 0x00;
marker.terminator_length = 0x00;
for (index = 0; index < 90; index++)
marker.reserved_90[index] = 0;
// send the marker information
if (ad_marker_send(port, &marker) >= 0) {
pr_debug("Sent Marker Information on port %d\n",
port->actor_port_number);
}
}
#endif
/**
* 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
//marker = *marker_info;
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; /* just to satisfy the compiler */
port = NULL; /* just to satisfy the compiler */
// 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(struct bonding *bond)
*
* 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_COMPARE(&(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
*/
int bond_3ad_bind_slave(struct slave *slave)
{
struct bonding *bond = bond_get_bond_by_slave(slave);
struct port *port;
struct aggregator *aggregator;
if (bond == NULL) {
pr_err("%s: The slave %s is not attached to its bond\n",
slave->dev->master->name, slave->dev->name);
return -1;
}
//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);
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 key : | User key | Speed |Duplex|
// ------------------------------------------------------------
// 16 6 1 0
port->actor_admin_port_key = 0; // initialize this parameter
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);
__initialize_port_locks(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;
}
return 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;
// find the aggregator related to this slave
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
// find the port related to this slave
port = &(SLAVE_AD_INFO(slave).port);
// if slave is null, the whole port is not initialized
if (!port->slave) {
pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
slave->dev->master->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)
new_aggregator = __get_first_agg(port);
for (; new_aggregator; new_aggregator = __get_next_agg(new_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 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->dev->master->name);
// select new active aggregator
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;
}
// clear the aggregator
ad_clear_agg(aggregator);
if (select_new_active_agg)
ad_agg_selection_logic(__get_first_agg(port));
} else {
pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
slave->dev->master->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;
// clear the aggregator
ad_clear_agg(aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->dev->master->name);
// select new active aggregator
ad_agg_selection_logic(__get_first_agg(port));
}
}
}
pr_debug("Unbinding port %d\n", port->actor_port_number);
// find the aggregator that this port is connected to
temp_aggregator = __get_first_agg(port);
for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_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;
// clear the aggregator
ad_clear_agg(temp_aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->dev->master->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 port *port;
struct aggregator *aggregator;
read_lock(&bond->lock);
//check if there are any slaves
if (bond->slave_cnt == 0)
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)) {
// select the active aggregator for the bond
if ((port = __get_first_port(bond))) {
if (!port->slave) {
pr_warning("%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
for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
if (!port->slave) {
pr_warning("%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:
queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
read_unlock(&bond->lock);
}
/**
* 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 void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
{
struct port *port;
if (length >= sizeof(struct lacpdu)) {
port = &(SLAVE_AD_INFO(slave).port);
if (!port->slave) {
pr_warning("%s: Warning: port of slave %s is uninitialized\n",
slave->dev->name, slave->dev->master->name);
return;
}
switch (lacpdu->subtype) {
case AD_TYPE_LACPDU:
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:
// 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);
}
}
}
}
/**
* 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_warning("Warning: %s: speed changed for uninitialized port on %s\n",
slave->dev->master->name, slave->dev->name);
return;
}
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;
}
/**
* 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_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
slave->dev->master->name, slave->dev->name);
return;
}
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;
}
/**
* 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_warning("Warning: %s: link status changed for uninitialized port on %s\n",
slave->dev->master->name, slave->dev->name);
return;
}
// 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);
}
//BOND_PRINT_DBG(("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;
}
/*
* set link state for bonding master: 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;
active = __get_active_agg(&(SLAVE_AD_INFO(bond->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);
return 1;
}
} else if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
return 1;
}
return 0;
}
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
return 1;
}
return 0;
}
/**
* 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 port *port;
for (port = __get_first_port(bond); port; port = __get_next_port(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;
}
int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
{
struct slave *slave, *start_at;
struct bonding *bond = netdev_priv(dev);
int slave_agg_no;
int slaves_in_agg;
int agg_id;
int i;
struct ad_info ad_info;
int res = 1;
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 out;
}
slaves_in_agg = ad_info.ports;
agg_id = ad_info.aggregator_id;
if (slaves_in_agg == 0) {
/*the aggregator is empty*/
pr_debug("%s: Error: active aggregator is empty\n", dev->name);
goto out;
}
slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
bond_for_each_slave(bond, slave, i) {
struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
if (agg && (agg->aggregator_identifier == agg_id)) {
slave_agg_no--;
if (slave_agg_no < 0)
break;
}
}
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 out;
}
start_at = slave;
bond_for_each_slave_from(bond, slave, i, start_at) {
int slave_agg_id = 0;
struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
if (agg)
slave_agg_id = agg->aggregator_identifier;
if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
break;
}
}
out:
if (res) {
/* no suitable interface, frame not sent */
dev_kfree_skb(skb);
}
return NETDEV_TX_OK;
}
void bond_3ad_lacpdu_recv(struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
if (skb->protocol != PKT_TYPE_LACPDU)
return;
if (!pskb_may_pull(skb, sizeof(struct lacpdu)))
return;
read_lock(&bond->lock);
bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
read_unlock(&bond->lock);
}
/*
* 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)
{
int i;
struct slave *slave;
struct port *port = NULL;
int lacp_fast;
read_lock(&bond->lock);
lacp_fast = bond->params.lacp_fast;
bond_for_each_slave(bond, slave, i) {
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);
}
read_unlock(&bond->lock);
}
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