bond_3ad.c 79.7 KB
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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.
 *
 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/if_bonding.h>
#include <linux/pkt_sched.h>
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#include <net/net_namespace.h>
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#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
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#define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
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//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;

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static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

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// ================= main 802.3ad protocol functions ==================
static int ad_lacpdu_send(struct port *port);
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static int ad_marker_send(struct port *port, struct bond_marker *marker);
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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);
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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);
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/////////////////////////////////////////////////////////////////////////////////
// ================= 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);
}

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/*
 * __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);
}

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/**
 * __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(port->slave->state == BOND_STATE_ACTIVE);
}

/**
 * __get_agg_selection_mode - get the aggregator selection mode
 * @port: the port we're looking at
 *
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 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
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 */
static inline u32 __get_agg_selection_mode(struct port *port)
{
	struct bonding *bond = __get_bond_by_port(port);

	if (bond == NULL) {
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		return BOND_AD_STABLE;
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	}

	return BOND_AD_INFO(bond).agg_select_mode;
}

/**
 * __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_rx_machine_lock - lock the port's RX machine
 * @port: the port we're looking at
 *
 */
static inline void __get_rx_machine_lock(struct port *port)
{
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	spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
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}

/**
 * __release_rx_machine_lock - unlock the port's RX machine
 * @port: the port we're looking at
 *
 */
static inline void __release_rx_machine_lock(struct port *port)
{
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	spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
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}

/**
 * __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,
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 *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 *     %AD_LINK_SPEED_BITMASK_10000MBPS
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 */
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;

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		case SPEED_10000:
			speed = AD_LINK_SPEED_BITMASK_10000MBPS;
			break;

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		default:
			speed = 0; // unknown speed value from ethtool. shouldn't happen
			break;
		}
	}

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	pr_debug("Port %d Received link speed %d update from adapter\n",
		 port->actor_port_number, speed);
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	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;
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			pr_debug("Port %d Received status full duplex update from adapter\n",
				 port->actor_port_number);
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			break;
		case DUPLEX_HALF:
		default:
			retval=0x0;
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			pr_debug("Port %d Received status NOT full duplex update from adapter\n",
				 port->actor_port_number);
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			break;
		}
	}
	return retval;
}

/**
 * __initialize_port_locks - initialize a port's RX 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).rx_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) {	      // for short or long timeout
			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 ==================
/////////////////////////////////////////////////////////////////////////////////

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/**
 * __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;
	}
}

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/**
 * __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) {
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		struct port_params *partner = &port->partner_oper;

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		__choose_matched(lacpdu, port);
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		// record the new parameter values for the partner operational
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		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;
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		// 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)) {
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			partner->port_state |= AD_STATE_SYNCHRONIZATION;
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		} else {
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			partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
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		}
	}
}

/**
 * __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
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		memcpy(&port->partner_oper, &port->partner_admin,
		       sizeof(struct port_params));
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		// 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) {
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		const struct port_params *partner = &port->partner_oper;

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		// check if any parameter is different
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		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)) {
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			// 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) {
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		const struct port_params *admin = &port->partner_admin;
		const struct port_params *oper = &port->partner_oper;

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		// check if any parameter is different
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		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)
606
			!= (oper->port_state & AD_STATE_AGGREGATION)) {
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			// 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
630 631
		if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
		    (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
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		    MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
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		    (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
		    (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
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		    ((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))
		   ) {
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			port->ntt = true;
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		}
	}
}

/**
 * __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;
	u32 basic_speed;

	if (aggregator->num_of_ports) {
		basic_speed = __get_link_speed(aggregator->lag_ports);
		switch (basic_speed) {
		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;
743 744 745
		case AD_LINK_SPEED_BITMASK_10000MBPS:
			bandwidth = aggregator->num_of_ports * 10000;
			break;
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		default:
			bandwidth=0; // to silent the compilor ....
		}
	}
	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;
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	const struct port_params *partner = &port->partner_oper;
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	/* update current actual Actor parameters */
	/* lacpdu->subtype                   initialized
	 * lacpdu->version_number            initialized
	 * lacpdu->tlv_type_actor_info       initialized
	 * lacpdu->actor_information_length  initialized
	 */

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	lacpdu->actor_system_priority = htons(port->actor_system_priority);
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	lacpdu->actor_system = port->actor_system;
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	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);
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	lacpdu->actor_state = port->actor_oper_port_state;

	/* lacpdu->reserved_3_1              initialized
	 * lacpdu->tlv_type_partner_info     initialized
	 * lacpdu->partner_information_length initialized
	 */

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	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;
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	/* 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;
843
	skb_reset_mac_header(skb);
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	skb->network_header = skb->mac_header + ETH_HLEN;
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	skb->protocol = PKT_TYPE_LACPDU;
	skb->priority = TC_PRIO_CONTROL;

	lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);

850
	memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
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	/* Note: source addres is set to be the member's PERMANENT address,
	   because we use it to identify loopback lacpdus in receive. */
853 854
	memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
	lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
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	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
 */
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static int ad_marker_send(struct port *port, struct bond_marker *marker)
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{
	struct slave *slave = port->slave;
	struct sk_buff *skb;
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	struct bond_marker_header *marker_header;
	int length = sizeof(struct bond_marker_header);
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	skb = dev_alloc_skb(length + 16);
	if (!skb) {
		return -ENOMEM;
	}

	skb_reserve(skb, 16);

	skb->dev = slave->dev;
886
	skb_reset_mac_header(skb);
887
	skb->network_header = skb->mac_header + ETH_HLEN;
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	skb->protocol = PKT_TYPE_LACPDU;

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	marker_header = (struct bond_marker_header *)skb_put(skb, length);
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892
	memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
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	/* Note: source addres is set to be the member's PERMANENT address,
	   because we use it to identify loopback MARKERs in receive. */
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	memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
	marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
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	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)
953
			if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
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				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) ||
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			    !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
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			   ) {
				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) {
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		pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
			 port->actor_port_number, last_state,
			 port->sm_mux_state);
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		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;
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			port->ntt = true;
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			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);
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			port->ntt = true;
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			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);
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			port->ntt = true;
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			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;

	// Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
	__get_rx_machine_lock(port);

	// 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;		    // next state
	}
	// 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;	    // next state
	}
	// 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)) {
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		pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
			 port->actor_port_number, last_state,
			 port->sm_rx_state);
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		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);
1113
			port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
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			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.
1121
			port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
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			port->sm_vars &= ~AD_PORT_MATCHED;
1123 1124
			port->partner_oper.port_state |=
				AD_STATE_LACP_ACTIVITY;
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			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
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				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",
1140
				       port->slave->dev->master->name, port->slave->dev->name);
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				__release_rx_machine_lock(port);
				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;
			// verify that if the aggregator is enabled, the port is enabled too.
			//(because if the link goes down for a short time, the 802.3ad will not
			// catch it, and the port will continue to be disabled)
			if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
				__enable_port(port);
			}
			break;
		default:    //to silence the compiler
			break;
		}
	}
	__release_rx_machine_lock(port);
}

/**
 * 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);
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			if (ad_lacpdu_send(port) >= 0) {
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				pr_debug("Sent LACPDU on port %d\n",
					 port->actor_port_number);
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				/* mark ntt as false, so it will not be sent again until
				   demanded */
				port->ntt = false;
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			}
		}
		// 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) ||
1205
	    (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
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	   ) {
		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:
1219
				if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
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					port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
				}
				break;
			case AD_SLOW_PERIODIC:
1224
				if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
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					// 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:
1240
			if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
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				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) {
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		pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
			 port->actor_port_number, last_state,
			 port->sm_periodic_state);
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		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:
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			port->ntt = true;
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			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;

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				pr_debug("Port %d left LAG %d\n",
					 port->actor_port_number,
					 temp_aggregator->aggregator_identifier);
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				// 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
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			pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
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				   port->slave->dev->master->name,
				   port->actor_port_number,
				   port->slave->dev->name,
				   port->aggregator->aggregator_identifier);
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		}
	}
	// 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
1343 1344 1345
		     !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)
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		    ) &&
1347
		    ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
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		      !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;
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			pr_debug("Port %d joined LAG %d(existing LAG)\n",
				 port->actor_port_number,
				 port->aggregator->aggregator_identifier);
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			// 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
1378
				port->aggregator->is_individual = false;
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			} else {
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				port->aggregator->is_individual = true;
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			}

			port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
			port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
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			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;
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			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;

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			pr_debug("Port %d joined LAG %d(new LAG)\n",
				 port->actor_port_number,
				 port->aggregator->aggregator_identifier);
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		} else {
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			pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1401
			       port->slave->dev->master->name,
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			       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));

1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
	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:
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		pr_warning("%s: Impossible agg select mode %d\n",
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			   curr->slave->dev->master->name,
			   __get_agg_selection_mode(curr->lag_ports));
1480
		break;
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	}
1482 1483

	return best;
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}

1486 1487 1488 1489 1490 1491
static int agg_device_up(const struct aggregator *agg)
{
	return (netif_running(agg->slave->dev) &&
		netif_carrier_ok(agg->slave->dev));
}

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/**
 * 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.
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 *
 * 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.
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 *
 * 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.
 */
1517
static void ad_agg_selection_logic(struct aggregator *agg)
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{
1519
	struct aggregator *best, *active, *origin;
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	struct port *port;

1522 1523
	origin = agg;
	active = __get_active_agg(agg);
1524
	best = (active && agg_device_up(active)) ? active : NULL;
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	do {
1527 1528
		agg->is_active = 0;

1529
		if (agg->num_of_ports && agg_device_up(agg))
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
			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;
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			}
		}
1552
	}
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	if (best && (best == active)) {
		best = NULL;
		active->is_active = 1;
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	}

	// if there is new best aggregator, activate it
1560
	if (best) {
1561
		pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
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			 best->aggregator_identifier, best->num_of_ports,
			 best->actor_oper_aggregator_key,
			 best->partner_oper_aggregator_key,
			 best->is_individual, best->is_active);
1566
		pr_debug("best ports %p slave %p %s\n",
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			 best->lag_ports, best->slave,
			 best->slave ? best->slave->dev->name : "NULL");
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		for (agg = __get_first_agg(best->lag_ports); agg;
		     agg = __get_next_agg(agg)) {

1573
			pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
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				 agg->aggregator_identifier, agg->num_of_ports,
				 agg->actor_oper_aggregator_key,
				 agg->partner_oper_aggregator_key,
				 agg->is_individual, agg->is_active);
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		}

		// check if any partner replys
1581
		if (best->is_individual) {
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			pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1583
				   best->slave ? best->slave->dev->master->name : "NULL");
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		}

1586
		best->is_active = 1;
1587
		pr_debug("LAG %d chosen as the active LAG\n",
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			 best->aggregator_identifier);
1589
		pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
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			 best->aggregator_identifier, best->num_of_ports,
			 best->actor_oper_aggregator_key,
			 best->partner_oper_aggregator_key,
			 best->is_individual, best->is_active);
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		// disable the ports that were related to the former active_aggregator
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		if (active) {
			for (port = active->lag_ports; port;
			     port = port->next_port_in_aggregator) {
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				__disable_port(port);
			}
		}
	}

1604 1605 1606 1607 1608
	/*
	 * if the selected aggregator is of join individuals
	 * (partner_system is NULL), enable their ports
	 */
	active = __get_active_agg(origin);
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1610 1611 1612 1613
	if (active) {
		if (!__agg_has_partner(active)) {
			for (port = active->lag_ports; port;
			     port = port->next_port_in_aggregator) {
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				__enable_port(port);
			}
		}
	}
1618 1619 1620 1621 1622 1623 1624 1625

	if (origin->slave) {
		struct bonding *bond;

		bond = bond_get_bond_by_slave(origin->slave);
		if (bond)
			bond_3ad_set_carrier(bond);
	}
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}

/**
 * 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) {
1636
		aggregator->is_individual = false;
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		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;
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		pr_debug("LAG %d was cleared\n",
			 aggregator->aggregator_identifier);
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	}
}

/**
 * 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)
{
1676 1677 1678 1679 1680 1681 1682
	static const struct port_params tmpl = {
		.system_priority = 0xffff,
		.key             = 1,
		.port_number     = 1,
		.port_priority   = 0xff,
		.port_state      = 1,
	};
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
	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),
	};
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	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;
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		port->ntt = false;
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		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;
		}

1711 1712 1713
		memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
		memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));

1714
		port->is_enabled = true;
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		// ****** 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;

1730
		memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
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	}
}

/**
 * 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) {
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		pr_debug("Enabling port %d(LAG %d)\n",
			 port->actor_port_number,
			 port->aggregator->aggregator_identifier);
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		__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))) {
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		pr_debug("Disabling port %d(LAG %d)\n",
			 port->actor_port_number,
			 port->aggregator->aggregator_identifier);
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		__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)
{
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	struct bond_marker marker;
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	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) {
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		pr_debug("Sent Marker Information on port %d\n",
			 port->actor_port_number);
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	}
}
#endif

/**
 * ad_marker_info_received - handle receive of a Marker information frame
 * @marker_info: Marker info received
 * @port: the port we're looking at
 *
 */
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static void ad_marker_info_received(struct bond_marker *marker_info,
	struct port *port)
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{
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	struct bond_marker marker;
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	// copy the received marker data to the response marker
	//marker = *marker_info;
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	memcpy(&marker, marker_info, sizeof(struct bond_marker));
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	// 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) {
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		pr_debug("Sent Marker Response on port %d\n",
			 port->actor_port_number);
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	}
}

/**
 * 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.
 */
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static void ad_marker_response_received(struct bond_marker *marker,
	struct port *port)
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{
	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

1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
/*
 * 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;
	BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
}

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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)
 * @lacp_fast: boolean. whether fast periodic should be used
 *
 * Can be called only after the mac address of the bond is set.
 */
void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1876
{
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	// check that the bond is not initialized yet
1878 1879
	if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
				bond->dev->dev_addr)) {
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		aggregator_identifier = 0;

		BOND_AD_INFO(bond).lacp_fast = lacp_fast;
		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;

1890 1891 1892
		bond_3ad_initiate_agg_selection(bond,
						AD_AGGREGATOR_SELECTION_TIMER *
						ad_ticks_per_sec);
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	}
}

/**
 * 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) {
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		pr_err("%s: The slave %s is not attached to its bond\n",
1911
		       slave->dev->master->name, slave->dev->name);
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		return -1;
	}

	//check that the slave has not been intialized yet.
	if (SLAVE_AD_INFO(slave).port.slave != slave) {

		// port initialization
		port = &(SLAVE_AD_INFO(slave).port);

		ad_initialize_port(port, BOND_AD_INFO(bond).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;
1977

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	// 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) {
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		pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
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			   slave->dev->master->name, slave->dev->name);
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		return;
	}

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	pr_debug("Unbinding Link Aggregation Group %d\n",
		 aggregator->aggregator_identifier);
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	/* 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)) {
2008
				// if the new aggregator is empty, or it is connected to our port only
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				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))) {
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				pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
					 aggregator->aggregator_identifier,
					 new_aggregator->aggregator_identifier);
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				if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
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					pr_info("%s: Removing an active aggregator\n",
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						aggregator->slave->dev->master->name);
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					// 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);
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				if (select_new_active_agg) {
					ad_agg_selection_logic(__get_first_agg(port));
				}
			} else {
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				pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
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					   slave->dev->master->name);
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			}
		} 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) {
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				pr_info("%s: Removing an active aggregator\n",
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					slave->dev->master->name);
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				// select new active aggregator
				ad_agg_selection_logic(__get_first_agg(port));
			}
		}
	}

2068
	pr_debug("Unbinding port %d\n", port->actor_port_number);
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	// 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) {
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						pr_info("%s: Removing an active aggregator\n",
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							slave->dev->master->name);
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						// select new active aggregator
						ad_agg_selection_logic(__get_first_agg(port));
					}
				}
				break;
			}
		}
	}
2097
	port->slave=NULL;
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}

/**
 * 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.
 */
2113
void bond_3ad_state_machine_handler(struct work_struct *work)
L
Linus Torvalds 已提交
2114
{
2115 2116
	struct bonding *bond = container_of(work, struct bonding,
					    ad_work.work);
L
Linus Torvalds 已提交
2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135
	struct port *port;
	struct aggregator *aggregator;

	read_lock(&bond->lock);

	if (bond->kill_timers) {
		goto out;
	}

	//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) {
J
Joe Perches 已提交
2136 2137
				pr_warning("%s: Warning: bond's first port is uninitialized\n",
					   bond->dev->name);
L
Linus Torvalds 已提交
2138 2139 2140 2141 2142 2143
				goto re_arm;
			}

			aggregator = __get_first_agg(port);
			ad_agg_selection_logic(aggregator);
		}
J
Jay Vosburgh 已提交
2144
		bond_3ad_set_carrier(bond);
L
Linus Torvalds 已提交
2145 2146 2147 2148 2149
	}

	// for each port run the state machines
	for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
		if (!port->slave) {
J
Joe Perches 已提交
2150 2151
			pr_warning("%s: Warning: Found an uninitialized port\n",
				   bond->dev->name);
L
Linus Torvalds 已提交
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
			goto re_arm;
		}

		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;
		}
	}

re_arm:
2168
	queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
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Linus Torvalds 已提交
2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191
out:
	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) {
J
Joe Perches 已提交
2192
			pr_warning("%s: Warning: port of slave %s is uninitialized\n",
J
Jiri Pirko 已提交
2193
				   slave->dev->name, slave->dev->master->name);
L
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2194 2195 2196 2197 2198
			return;
		}

		switch (lacpdu->subtype) {
		case AD_TYPE_LACPDU:
J
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2199 2200
			pr_debug("Received LACPDU on port %d\n",
				 port->actor_port_number);
L
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2201 2202 2203 2204 2205 2206
			ad_rx_machine(lacpdu, port);
			break;

		case AD_TYPE_MARKER:
			// No need to convert fields to Little Endian since we don't use the marker's fields.

M
Mathieu Desnoyers 已提交
2207
			switch (((struct bond_marker *)lacpdu)->tlv_type) {
L
Linus Torvalds 已提交
2208
			case AD_MARKER_INFORMATION_SUBTYPE:
J
Joe Perches 已提交
2209 2210
				pr_debug("Received Marker Information on port %d\n",
					 port->actor_port_number);
M
Mathieu Desnoyers 已提交
2211
				ad_marker_info_received((struct bond_marker *)lacpdu, port);
L
Linus Torvalds 已提交
2212 2213 2214
				break;

			case AD_MARKER_RESPONSE_SUBTYPE:
J
Joe Perches 已提交
2215 2216
				pr_debug("Received Marker Response on port %d\n",
					 port->actor_port_number);
M
Mathieu Desnoyers 已提交
2217
				ad_marker_response_received((struct bond_marker *)lacpdu, port);
L
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2218 2219 2220
				break;

			default:
J
Joe Perches 已提交
2221 2222
				pr_debug("Received an unknown Marker subtype on slot %d\n",
					 port->actor_port_number);
L
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2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241
			}
		}
	}
}

/**
 * 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) {
J
Joe Perches 已提交
2242
		pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
J
Jiri Pirko 已提交
2243
			   slave->dev->master->name, slave->dev->name);
L
Linus Torvalds 已提交
2244 2245 2246 2247 2248
		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);
2249
	pr_debug("Port %d changed speed\n", port->actor_port_number);
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Linus Torvalds 已提交
2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268
	// 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) {
J
Joe Perches 已提交
2269
		pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
J
Jiri Pirko 已提交
2270
			   slave->dev->master->name, slave->dev->name);
L
Linus Torvalds 已提交
2271 2272 2273 2274 2275
		return;
	}

	port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
	port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2276
	pr_debug("Port %d changed duplex\n", port->actor_port_number);
L
Linus Torvalds 已提交
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
	// 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) {
J
Joe Perches 已提交
2297
		pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
J
Jiri Pirko 已提交
2298
			   slave->dev->master->name, slave->dev->name);
L
Linus Torvalds 已提交
2299 2300 2301 2302 2303 2304
		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) {
2305
		port->is_enabled = true;
L
Linus Torvalds 已提交
2306 2307 2308 2309 2310 2311
		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 */
2312
		port->is_enabled = false;
L
Linus Torvalds 已提交
2313 2314 2315 2316 2317 2318 2319 2320 2321
		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;
}

2322
/*
2323
 * set link state for bonding master: if we have an active
2324 2325 2326
 * 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.
 *
2327 2328
 * This behavior complies with IEEE 802.3 section 43.3.9.
 *
2329 2330 2331 2332 2333
 * 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)
{
2334
	if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348
		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;
}

L
Linus Torvalds 已提交
2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
/**
 * 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;
2384
	struct bonding *bond = netdev_priv(dev);
L
Linus Torvalds 已提交
2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
	int slave_agg_no;
	int slaves_in_agg;
	int agg_id;
	int i;
	struct ad_info ad_info;
	int res = 1;

	/* make sure that the slaves list will
	 * not change during tx
	 */
	read_lock(&bond->lock);

	if (!BOND_IS_OK(bond)) {
		goto out;
	}

	if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
J
Joe Perches 已提交
2402 2403
		pr_debug("%s: Error: bond_3ad_get_active_agg_info failed\n",
			 dev->name);
L
Linus Torvalds 已提交
2404 2405 2406 2407 2408 2409 2410 2411
		goto out;
	}

	slaves_in_agg = ad_info.ports;
	agg_id = ad_info.aggregator_id;

	if (slaves_in_agg == 0) {
		/*the aggregator is empty*/
J
Joe Perches 已提交
2412
		pr_debug("%s: Error: active aggregator is empty\n", dev->name);
L
Linus Torvalds 已提交
2413 2414 2415
		goto out;
	}

2416
	slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
L
Linus Torvalds 已提交
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429

	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) {
J
Joe Perches 已提交
2430 2431
		pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
		       dev->name, agg_id);
L
Linus Torvalds 已提交
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456
		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);
	}
	read_unlock(&bond->lock);
2457
	return NETDEV_TX_OK;
L
Linus Torvalds 已提交
2458 2459
}

D
David S. Miller 已提交
2460
int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
L
Linus Torvalds 已提交
2461
{
2462
	struct bonding *bond = netdev_priv(dev);
L
Linus Torvalds 已提交
2463 2464 2465
	struct slave *slave = NULL;
	int ret = NET_RX_DROP;

D
David S. Miller 已提交
2466
	if (!(dev->flags & IFF_MASTER))
L
Linus Torvalds 已提交
2467 2468 2469
		goto out;

	read_lock(&bond->lock);
2470 2471
	slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
					orig_dev);
D
David S. Miller 已提交
2472
	if (!slave)
L
Linus Torvalds 已提交
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485
		goto out_unlock;

	bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);

	ret = NET_RX_SUCCESS;

out_unlock:
	read_unlock(&bond->lock);
out:
	dev_kfree_skb(skb);

	return ret;
}