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alistair23-linux/drivers/net/bonding/bond_3ad.c
dingtianhong 108db73637 bonding: protect port for bond_3ad_handle_link_change() 
The bond_3ad_handle_link_change is called with RTNL only,
and the function will modify the port's information with
no further locking, it will not mutex against bond state
machine and incoming LACPDU which do not hold RTNL, So I
add __get_state_machine_lock to protect the port.

But it is not a critical bug, it exist since day one, and till
now it has never been hit and reported, because changes to
speed is very rare, and will not occur critical problem.

The comments in the function is very old, cleanup it and
add a new pr_debug to debug the port message.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-18 16:52:26 -05:00

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/*
* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_bonding.h>
#include <linux/pkt_sched.h>
#include <net/net_namespace.h>
#include "bonding.h"
#include "bond_3ad.h"
// General definitions
#define AD_SHORT_TIMEOUT 1
#define AD_LONG_TIMEOUT 0
#define AD_STANDBY 0x2
#define AD_MAX_TX_IN_SECOND 3
#define AD_COLLECTOR_MAX_DELAY 0
// Timer definitions(43.4.4 in the 802.3ad standard)
#define AD_FAST_PERIODIC_TIME 1
#define AD_SLOW_PERIODIC_TIME 30
#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
#define AD_CHURN_DETECTION_TIME 60
#define AD_AGGREGATE_WAIT_TIME 2
// Port state definitions(43.4.2.2 in the 802.3ad standard)
#define AD_STATE_LACP_ACTIVITY 0x1
#define AD_STATE_LACP_TIMEOUT 0x2
#define AD_STATE_AGGREGATION 0x4
#define AD_STATE_SYNCHRONIZATION 0x8
#define AD_STATE_COLLECTING 0x10
#define AD_STATE_DISTRIBUTING 0x20
#define AD_STATE_DEFAULTED 0x40
#define AD_STATE_EXPIRED 0x80
// Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
#define AD_PORT_BEGIN 0x1
#define AD_PORT_LACP_ENABLED 0x2
#define AD_PORT_ACTOR_CHURN 0x4
#define AD_PORT_PARTNER_CHURN 0x8
#define AD_PORT_READY 0x10
#define AD_PORT_READY_N 0x20
#define AD_PORT_MATCHED 0x40
#define AD_PORT_STANDBY 0x80
#define AD_PORT_SELECTED 0x100
#define AD_PORT_MOVED 0x200
// Port Key definitions
// key is determined according to the link speed, duplex and
// user key(which is yet not supported)
// ------------------------------------------------------------
// Port key : | User key | Speed |Duplex|
// ------------------------------------------------------------
// 16 6 1 0
#define AD_DUPLEX_KEY_BITS 0x1
#define AD_SPEED_KEY_BITS 0x3E
#define AD_USER_KEY_BITS 0xFFC0
//dalloun
#define AD_LINK_SPEED_BITMASK_1MBPS 0x1
#define AD_LINK_SPEED_BITMASK_10MBPS 0x2
#define AD_LINK_SPEED_BITMASK_100MBPS 0x4
#define AD_LINK_SPEED_BITMASK_1000MBPS 0x8
#define AD_LINK_SPEED_BITMASK_10000MBPS 0x10
//endalloun
// compare MAC addresses
#define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
static u16 ad_ticks_per_sec;
static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
// ================= main 802.3ad protocol functions ==================
static int ad_lacpdu_send(struct port *port);
static int ad_marker_send(struct port *port, struct bond_marker *marker);
static void ad_mux_machine(struct port *port);
static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
static void ad_tx_machine(struct port *port);
static void ad_periodic_machine(struct port *port);
static void ad_port_selection_logic(struct port *port);
static void ad_agg_selection_logic(struct aggregator *aggregator);
static void ad_clear_agg(struct aggregator *aggregator);
static void ad_initialize_agg(struct aggregator *aggregator);
static void ad_initialize_port(struct port *port, int lacp_fast);
static void ad_enable_collecting_distributing(struct port *port);
static void ad_disable_collecting_distributing(struct port *port);
static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
/////////////////////////////////////////////////////////////////////////////////
// ================= api to bonding and kernel code ==================
/////////////////////////////////////////////////////////////////////////////////
/**
* __get_bond_by_port - get the port's bonding struct
* @port: the port we're looking at
*
* Return @port's bonding struct, or %NULL if it can't be found.
*/
static inline struct bonding *__get_bond_by_port(struct port *port)
{
if (port->slave == NULL)
return NULL;
return bond_get_bond_by_slave(port->slave);
}
/**
* __get_first_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);
struct slave *first_slave;
// If there's no bond for this port, or bond has no slaves
if (bond == NULL)
return NULL;
first_slave = bond_first_slave(bond);
return first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
}
/*
* __agg_has_partner
*
* Return nonzero if aggregator has a partner (denoted by a non-zero ether
* address for the partner). Return 0 if not.
*/
static inline int __agg_has_partner(struct aggregator *agg)
{
return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
}
/**
* __disable_port - disable the port's slave
* @port: the port we're looking at
*
*/
static inline void __disable_port(struct port *port)
{
bond_set_slave_inactive_flags(port->slave);
}
/**
* __enable_port - enable the port's slave, if it's up
* @port: the port we're looking at
*
*/
static inline void __enable_port(struct port *port)
{
struct slave *slave = port->slave;
if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
bond_set_slave_active_flags(slave);
}
/**
* __port_is_enabled - check if the port's slave is in active state
* @port: the port we're looking at
*
*/
static inline int __port_is_enabled(struct port *port)
{
return bond_is_active_slave(port->slave);
}
/**
* __get_agg_selection_mode - get the aggregator selection mode
* @port: the port we're looking at
*
* Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
*/
static inline u32 __get_agg_selection_mode(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
if (bond == NULL)
return BOND_AD_STABLE;
return bond->params.ad_select;
}
/**
* __check_agg_selection_timer - check if the selection timer has expired
* @port: the port we're looking at
*
*/
static inline int __check_agg_selection_timer(struct port *port)
{
struct bonding *bond = __get_bond_by_port(port);
if (bond == NULL)
return 0;
return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
}
/**
* __get_state_machine_lock - lock the port's state machines
* @port: the port we're looking at
*
*/
static inline void __get_state_machine_lock(struct port *port)
{
spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
}
/**
* __release_state_machine_lock - unlock the port's state machines
* @port: the port we're looking at
*
*/
static inline void __release_state_machine_lock(struct port *port)
{
spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
}
/**
* __get_link_speed - get a port's speed
* @port: the port we're looking at
*
* Return @port's speed in 802.3ad bitmask format. i.e. one of:
* 0,
* %AD_LINK_SPEED_BITMASK_10MBPS,
* %AD_LINK_SPEED_BITMASK_100MBPS,
* %AD_LINK_SPEED_BITMASK_1000MBPS,
* %AD_LINK_SPEED_BITMASK_10000MBPS
*/
static u16 __get_link_speed(struct port *port)
{
struct slave *slave = port->slave;
u16 speed;
/* this if covers only a special case: when the configuration starts with
* link down, it sets the speed to 0.
* This is done in spite of the fact that the e100 driver reports 0 to be
* compatible with MVT in the future.*/
if (slave->link != BOND_LINK_UP)
speed = 0;
else {
switch (slave->speed) {
case SPEED_10:
speed = AD_LINK_SPEED_BITMASK_10MBPS;
break;
case SPEED_100:
speed = AD_LINK_SPEED_BITMASK_100MBPS;
break;
case SPEED_1000:
speed = AD_LINK_SPEED_BITMASK_1000MBPS;
break;
case SPEED_10000:
speed = AD_LINK_SPEED_BITMASK_10000MBPS;
break;
default:
speed = 0; // unknown speed value from ethtool. shouldn't happen
break;
}
}
pr_debug("Port %d Received link speed %d update from adapter\n",
port->actor_port_number, speed);
return speed;
}
/**
* __get_duplex - get a port's duplex
* @port: the port we're looking at
*
* Return @port's duplex in 802.3ad bitmask format. i.e.:
* 0x01 if in full duplex
* 0x00 otherwise
*/
static u8 __get_duplex(struct port *port)
{
struct slave *slave = port->slave;
u8 retval;
// handling a special case: when the configuration starts with
// link down, it sets the duplex to 0.
if (slave->link != BOND_LINK_UP)
retval = 0x0;
else {
switch (slave->duplex) {
case DUPLEX_FULL:
retval = 0x1;
pr_debug("Port %d Received status full duplex update from adapter\n",
port->actor_port_number);
break;
case DUPLEX_HALF:
default:
retval = 0x0;
pr_debug("Port %d Received status NOT full duplex update from adapter\n",
port->actor_port_number);
break;
}
}
return retval;
}
/**
* __initialize_port_locks - initialize a port's STATE machine spinlock
* @port: the slave of the port we're looking at
*
*/
static inline void __initialize_port_locks(struct slave *slave)
{
// make sure it isn't called twice
spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
}
//conversions
/**
* __ad_timer_to_ticks - convert a given timer type to AD module ticks
* @timer_type: which timer to operate
* @par: timer parameter. see below
*
* If @timer_type is %current_while_timer, @par indicates long/short timer.
* If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
* %SLOW_PERIODIC_TIME.
*/
static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
{
u16 retval = 0; /* to silence the compiler */
switch (timer_type) {
case AD_CURRENT_WHILE_TIMER: // for rx machine usage
if (par)
retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
else
retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
break;
case AD_ACTOR_CHURN_TIMER: // for local churn machine
retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
break;
case AD_PERIODIC_TIMER: // for periodic machine
retval = (par*ad_ticks_per_sec); // long timeout
break;
case AD_PARTNER_CHURN_TIMER: // for remote churn machine
retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
break;
case AD_WAIT_WHILE_TIMER: // for selection machine
retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
break;
}
return retval;
}
/////////////////////////////////////////////////////////////////////////////////
// ================= ad_rx_machine helper functions ==================
/////////////////////////////////////////////////////////////////////////////////
/**
* __choose_matched - update a port's matched variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Update the value of the matched variable, using parameter values from a
* newly received lacpdu. Parameter values for the partner carried in the
* received PDU are compared with the corresponding operational parameter
* values for the actor. Matched is set to TRUE if all of these parameters
* match and the PDU parameter partner_state.aggregation has the same value as
* actor_oper_port_state.aggregation and lacp will actively maintain the link
* in the aggregation. Matched is also set to TRUE if the value of
* actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
* an individual link and lacp will actively maintain the link. Otherwise,
* matched is set to FALSE. LACP is considered to be actively maintaining the
* link if either the PDU's actor_state.lacp_activity variable is TRUE or both
* the actor's actor_oper_port_state.lacp_activity and the PDU's
* partner_state.lacp_activity variables are TRUE.
*
* Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
* used here to implement the language from 802.3ad 43.4.9 that requires
* recordPDU to "match" the LACPDU parameters to the stored values.
*/
static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
{
// check if all parameters are alike
if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
(ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
!MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
(ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
(ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
// or this is individual link(aggregation == FALSE)
((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
) {
// update the state machine Matched variable
port->sm_vars |= AD_PORT_MATCHED;
} else {
port->sm_vars &= ~AD_PORT_MATCHED;
}
}
/**
* __record_pdu - record parameters from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Record the parameter values for the Actor carried in a received lacpdu as
* the current partner operational parameter values and sets
* actor_oper_port_state.defaulted to FALSE.
*/
static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
{
if (lacpdu && port) {
struct port_params *partner = &port->partner_oper;
__choose_matched(lacpdu, port);
// record the new parameter values for the partner operational
partner->port_number = ntohs(lacpdu->actor_port);
partner->port_priority = ntohs(lacpdu->actor_port_priority);
partner->system = lacpdu->actor_system;
partner->system_priority = ntohs(lacpdu->actor_system_priority);
partner->key = ntohs(lacpdu->actor_key);
partner->port_state = lacpdu->actor_state;
// set actor_oper_port_state.defaulted to FALSE
port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
// set the partner sync. to on if the partner is sync. and the port is matched
if ((port->sm_vars & AD_PORT_MATCHED)
&& (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
partner->port_state |= AD_STATE_SYNCHRONIZATION;
else
partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
}
}
/**
* __record_default - record default parameters
* @port: the port we're looking at
*
* This function records the default parameter values for the partner carried
* in the Partner Admin parameters as the current partner operational parameter
* values and sets actor_oper_port_state.defaulted to TRUE.
*/
static void __record_default(struct port *port)
{
if (port) {
// record the partner admin parameters
memcpy(&port->partner_oper, &port->partner_admin,
sizeof(struct port_params));
// set actor_oper_port_state.defaulted to true
port->actor_oper_port_state |= AD_STATE_DEFAULTED;
}
}
/**
* __update_selected - update a port's Selected variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Update the value of the selected variable, using parameter values from a
* newly received lacpdu. The parameter values for the Actor carried in the
* received PDU are compared with the corresponding operational parameter
* values for the ports partner. If one or more of the comparisons shows that
* the value(s) received in the PDU differ from the current operational values,
* then selected is set to FALSE and actor_oper_port_state.synchronization is
* set to out_of_sync. Otherwise, selected remains unchanged.
*/
static void __update_selected(struct lacpdu *lacpdu, struct port *port)
{
if (lacpdu && port) {
const struct port_params *partner = &port->partner_oper;
// check if any parameter is different
if (ntohs(lacpdu->actor_port) != partner->port_number ||
ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
ntohs(lacpdu->actor_key) != partner->key ||
(lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
// update the state machine Selected variable
port->sm_vars &= ~AD_PORT_SELECTED;
}
}
}
/**
* __update_default_selected - update a port's Selected variable from Partner
* @port: the port we're looking at
*
* This function updates the value of the selected variable, using the partner
* administrative parameter values. The administrative values are compared with
* the corresponding operational parameter values for the partner. If one or
* more of the comparisons shows that the administrative value(s) differ from
* the current operational values, then Selected is set to FALSE and
* actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
* Selected remains unchanged.
*/
static void __update_default_selected(struct port *port)
{
if (port) {
const struct port_params *admin = &port->partner_admin;
const struct port_params *oper = &port->partner_oper;
// check if any parameter is different
if (admin->port_number != oper->port_number ||
admin->port_priority != oper->port_priority ||
MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
admin->system_priority != oper->system_priority ||
admin->key != oper->key ||
(admin->port_state & AD_STATE_AGGREGATION)
!= (oper->port_state & AD_STATE_AGGREGATION)) {
// update the state machine Selected variable
port->sm_vars &= ~AD_PORT_SELECTED;
}
}
}
/**
* __update_ntt - update a port's ntt variable from a received lacpdu
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* Updates the value of the ntt variable, using parameter values from a newly
* received lacpdu. The parameter values for the partner carried in the
* received PDU are compared with the corresponding operational parameter
* values for the Actor. If one or more of the comparisons shows that the
* value(s) received in the PDU differ from the current operational values,
* then ntt is set to TRUE. Otherwise, ntt remains unchanged.
*/
static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
{
// validate lacpdu and port
if (lacpdu && port) {
// check if any parameter is different
if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
(ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
(ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
(ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
) {
port->ntt = true;
}
}
}
/**
* __attach_bond_to_agg
* @port: the port we're looking at
*
* Handle the attaching of the port's control parser/multiplexer and the
* aggregator. This function does nothing since the parser/multiplexer of the
* receive and the parser/multiplexer of the aggregator are already combined.
*/
static void __attach_bond_to_agg(struct port *port)
{
port = NULL; /* just to satisfy the compiler */
// This function does nothing since the parser/multiplexer of the receive
// and the parser/multiplexer of the aggregator are already combined
}
/**
* __detach_bond_from_agg
* @port: the port we're looking at
*
* Handle the detaching of the port's control parser/multiplexer from the
* aggregator. This function does nothing since the parser/multiplexer of the
* receive and the parser/multiplexer of the aggregator are already combined.
*/
static void __detach_bond_from_agg(struct port *port)
{
port = NULL; /* just to satisfy the compiler */
// This function does nothing since the parser/multiplexer of the receive
// and the parser/multiplexer of the aggregator are already combined
}
/**
* __agg_ports_are_ready - check if all ports in an aggregator are ready
* @aggregator: the aggregator we're looking at
*
*/
static int __agg_ports_are_ready(struct aggregator *aggregator)
{
struct port *port;
int retval = 1;
if (aggregator) {
// scan all ports in this aggregator to verfy if they are all ready
for (port = aggregator->lag_ports;
port;
port = port->next_port_in_aggregator) {
if (!(port->sm_vars & AD_PORT_READY_N)) {
retval = 0;
break;
}
}
}
return retval;
}
/**
* __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
* @aggregator: the aggregator we're looking at
* @val: Should the ports' ready bit be set on or off
*
*/
static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
{
struct port *port;
for (port = aggregator->lag_ports; port;
port = port->next_port_in_aggregator) {
if (val)
port->sm_vars |= AD_PORT_READY;
else
port->sm_vars &= ~AD_PORT_READY;
}
}
/**
* __get_agg_bandwidth - get the total bandwidth of an aggregator
* @aggregator: the aggregator we're looking at
*
*/
static u32 __get_agg_bandwidth(struct aggregator *aggregator)
{
u32 bandwidth = 0;
if (aggregator->num_of_ports) {
switch (__get_link_speed(aggregator->lag_ports)) {
case AD_LINK_SPEED_BITMASK_1MBPS:
bandwidth = aggregator->num_of_ports;
break;
case AD_LINK_SPEED_BITMASK_10MBPS:
bandwidth = aggregator->num_of_ports * 10;
break;
case AD_LINK_SPEED_BITMASK_100MBPS:
bandwidth = aggregator->num_of_ports * 100;
break;
case AD_LINK_SPEED_BITMASK_1000MBPS:
bandwidth = aggregator->num_of_ports * 1000;
break;
case AD_LINK_SPEED_BITMASK_10000MBPS:
bandwidth = aggregator->num_of_ports * 10000;
break;
default:
bandwidth = 0; /*to silence the compiler ....*/
}
}
return bandwidth;
}
/**
* __get_active_agg - get the current active aggregator
* @aggregator: the aggregator we're looking at
*
*/
static struct aggregator *__get_active_agg(struct aggregator *aggregator)
{
struct bonding *bond = aggregator->slave->bond;
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter)
if (SLAVE_AD_INFO(slave).aggregator.is_active)
return &(SLAVE_AD_INFO(slave).aggregator);
return NULL;
}
/**
* __update_lacpdu_from_port - update a port's lacpdu fields
* @port: the port we're looking at
*
*/
static inline void __update_lacpdu_from_port(struct port *port)
{
struct lacpdu *lacpdu = &port->lacpdu;
const struct port_params *partner = &port->partner_oper;
/* update current actual Actor parameters */
/* lacpdu->subtype initialized
* lacpdu->version_number initialized
* lacpdu->tlv_type_actor_info initialized
* lacpdu->actor_information_length initialized
*/
lacpdu->actor_system_priority = htons(port->actor_system_priority);
lacpdu->actor_system = port->actor_system;
lacpdu->actor_key = htons(port->actor_oper_port_key);
lacpdu->actor_port_priority = htons(port->actor_port_priority);
lacpdu->actor_port = htons(port->actor_port_number);
lacpdu->actor_state = port->actor_oper_port_state;
/* lacpdu->reserved_3_1 initialized
* lacpdu->tlv_type_partner_info initialized
* lacpdu->partner_information_length initialized
*/
lacpdu->partner_system_priority = htons(partner->system_priority);
lacpdu->partner_system = partner->system;
lacpdu->partner_key = htons(partner->key);
lacpdu->partner_port_priority = htons(partner->port_priority);
lacpdu->partner_port = htons(partner->port_number);
lacpdu->partner_state = partner->port_state;
/* lacpdu->reserved_3_2 initialized
* lacpdu->tlv_type_collector_info initialized
* lacpdu->collector_information_length initialized
* collector_max_delay initialized
* reserved_12[12] initialized
* tlv_type_terminator initialized
* terminator_length initialized
* reserved_50[50] initialized
*/
}
//////////////////////////////////////////////////////////////////////////////////////
// ================= main 802.3ad protocol code ======================================
//////////////////////////////////////////////////////////////////////////////////////
/**
* ad_lacpdu_send - send out a lacpdu packet on a given port
* @port: the port we're looking at
*
* Returns: 0 on success
* < 0 on error
*/
static int ad_lacpdu_send(struct port *port)
{
struct slave *slave = port->slave;
struct sk_buff *skb;
struct lacpdu_header *lacpdu_header;
int length = sizeof(struct lacpdu_header);
skb = dev_alloc_skb(length);
if (!skb)
return -ENOMEM;
skb->dev = slave->dev;
skb_reset_mac_header(skb);
skb->network_header = skb->mac_header + ETH_HLEN;
skb->protocol = PKT_TYPE_LACPDU;
skb->priority = TC_PRIO_CONTROL;
lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
/* Note: source address is set to be the member's PERMANENT address,
because we use it to identify loopback lacpdus in receive. */
memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
lacpdu_header->lacpdu = port->lacpdu; // struct copy
dev_queue_xmit(skb);
return 0;
}
/**
* ad_marker_send - send marker information/response on a given port
* @port: the port we're looking at
* @marker: marker data to send
*
* Returns: 0 on success
* < 0 on error
*/
static int ad_marker_send(struct port *port, struct bond_marker *marker)
{
struct slave *slave = port->slave;
struct sk_buff *skb;
struct bond_marker_header *marker_header;
int length = sizeof(struct bond_marker_header);
skb = dev_alloc_skb(length + 16);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 16);
skb->dev = slave->dev;
skb_reset_mac_header(skb);
skb->network_header = skb->mac_header + ETH_HLEN;
skb->protocol = PKT_TYPE_LACPDU;
marker_header = (struct bond_marker_header *)skb_put(skb, length);
memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
/* Note: source address is set to be the member's PERMANENT address,
because we use it to identify loopback MARKERs in receive. */
memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
marker_header->marker = *marker; // struct copy
dev_queue_xmit(skb);
return 0;
}
/**
* ad_mux_machine - handle a port's mux state machine
* @port: the port we're looking at
*
*/
static void ad_mux_machine(struct port *port)
{
mux_states_t last_state;
// keep current State Machine state to compare later if it was changed
last_state = port->sm_mux_state;
if (port->sm_vars & AD_PORT_BEGIN) {
port->sm_mux_state = AD_MUX_DETACHED; // next state
} else {
switch (port->sm_mux_state) {
case AD_MUX_DETACHED:
if ((port->sm_vars & AD_PORT_SELECTED)
|| (port->sm_vars & AD_PORT_STANDBY))
/* if SELECTED or STANDBY */
port->sm_mux_state = AD_MUX_WAITING; // next state
break;
case AD_MUX_WAITING:
// if SELECTED == FALSE return to DETACH state
if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
port->sm_vars &= ~AD_PORT_READY_N;
// in order to withhold the Selection Logic to check all ports READY_N value
// every callback cycle to update ready variable, we check READY_N and update READY here
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
port->sm_mux_state = AD_MUX_DETACHED; // next state
break;
}
// check if the wait_while_timer expired
if (port->sm_mux_timer_counter
&& !(--port->sm_mux_timer_counter))
port->sm_vars |= AD_PORT_READY_N;
// in order to withhold the selection logic to check all ports READY_N value
// every callback cycle to update ready variable, we check READY_N and update READY here
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
// if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
if ((port->sm_vars & AD_PORT_READY)
&& !port->sm_mux_timer_counter)
port->sm_mux_state = AD_MUX_ATTACHED; // next state
break;
case AD_MUX_ATTACHED:
// check also if agg_select_timer expired(so the edable port will take place only after this timer)
if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
} else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if UNSELECTED or STANDBY
port->sm_vars &= ~AD_PORT_READY_N;
// in order to withhold the selection logic to check all ports READY_N value
// every callback cycle to update ready variable, we check READY_N and update READY here
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
port->sm_mux_state = AD_MUX_DETACHED;// next state
}
break;
case AD_MUX_COLLECTING_DISTRIBUTING:
if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
!(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
) {
port->sm_mux_state = AD_MUX_ATTACHED;// next state
} else {
// if port state hasn't changed make
// sure that a collecting distributing
// port in an active aggregator is enabled
if (port->aggregator &&
port->aggregator->is_active &&
!__port_is_enabled(port)) {
__enable_port(port);
}
}
break;
default: //to silence the compiler
break;
}
}
// check if the state machine was changed
if (port->sm_mux_state != last_state) {
pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_mux_state);
switch (port->sm_mux_state) {
case AD_MUX_DETACHED:
__detach_bond_from_agg(port);
port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
ad_disable_collecting_distributing(port);
port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
port->ntt = true;
break;
case AD_MUX_WAITING:
port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
break;
case AD_MUX_ATTACHED:
__attach_bond_to_agg(port);
port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
ad_disable_collecting_distributing(port);
port->ntt = true;
break;
case AD_MUX_COLLECTING_DISTRIBUTING:
port->actor_oper_port_state |= AD_STATE_COLLECTING;
port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
ad_enable_collecting_distributing(port);
port->ntt = true;
break;
default: //to silence the compiler
break;
}
}
}
/**
* ad_rx_machine - handle a port's rx State Machine
* @lacpdu: the lacpdu we've received
* @port: the port we're looking at
*
* If lacpdu arrived, stop previous timer (if exists) and set the next state as
* CURRENT. If timer expired set the state machine in the proper state.
* In other cases, this function checks if we need to switch to other state.
*/
static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
{
rx_states_t last_state;
// keep current State Machine state to compare later if it was changed
last_state = port->sm_rx_state;
// check if state machine should change state
// first, check if port was reinitialized
if (port->sm_vars & AD_PORT_BEGIN)
/* next state */
port->sm_rx_state = AD_RX_INITIALIZE;
// check if port is not enabled
else if (!(port->sm_vars & AD_PORT_BEGIN)
&& !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
/* next state */
port->sm_rx_state = AD_RX_PORT_DISABLED;
// check if new lacpdu arrived
else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
port->sm_rx_timer_counter = 0; // zero timer
port->sm_rx_state = AD_RX_CURRENT;
} else {
// if timer is on, and if it is expired
if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
switch (port->sm_rx_state) {
case AD_RX_EXPIRED:
port->sm_rx_state = AD_RX_DEFAULTED; // next state
break;
case AD_RX_CURRENT:
port->sm_rx_state = AD_RX_EXPIRED; // next state
break;
default: //to silence the compiler
break;
}
} else {
// if no lacpdu arrived and no timer is on
switch (port->sm_rx_state) {
case AD_RX_PORT_DISABLED:
if (port->sm_vars & AD_PORT_MOVED)
port->sm_rx_state = AD_RX_INITIALIZE; // next state
else if (port->is_enabled
&& (port->sm_vars
& AD_PORT_LACP_ENABLED))
port->sm_rx_state = AD_RX_EXPIRED; // next state
else if (port->is_enabled
&& ((port->sm_vars
& AD_PORT_LACP_ENABLED) == 0))
port->sm_rx_state = AD_RX_LACP_DISABLED; // next state
break;
default: //to silence the compiler
break;
}
}
}
// check if the State machine was changed or new lacpdu arrived
if ((port->sm_rx_state != last_state) || (lacpdu)) {
pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_rx_state);
switch (port->sm_rx_state) {
case AD_RX_INITIALIZE:
if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
port->sm_vars &= ~AD_PORT_LACP_ENABLED;
else
port->sm_vars |= AD_PORT_LACP_ENABLED;
port->sm_vars &= ~AD_PORT_SELECTED;
__record_default(port);
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
port->sm_vars &= ~AD_PORT_MOVED;
port->sm_rx_state = AD_RX_PORT_DISABLED; // next state
/*- Fall Through -*/
case AD_RX_PORT_DISABLED:
port->sm_vars &= ~AD_PORT_MATCHED;
break;
case AD_RX_LACP_DISABLED:
port->sm_vars &= ~AD_PORT_SELECTED;
__record_default(port);
port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
port->sm_vars |= AD_PORT_MATCHED;
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
case AD_RX_EXPIRED:
//Reset of the Synchronization flag. (Standard 43.4.12)
//This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
//mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
port->sm_vars &= ~AD_PORT_MATCHED;
port->partner_oper.port_state |=
AD_STATE_LACP_ACTIVITY;
port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
port->actor_oper_port_state |= AD_STATE_EXPIRED;
break;
case AD_RX_DEFAULTED:
__update_default_selected(port);
__record_default(port);
port->sm_vars |= AD_PORT_MATCHED;
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
case AD_RX_CURRENT:
// detect loopback situation
if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
// INFO_RECEIVED_LOOPBACK_FRAMES
pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
"Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
port->slave->bond->dev->name, port->slave->dev->name);
return;
}
__update_selected(lacpdu, port);
__update_ntt(lacpdu, port);
__record_pdu(lacpdu, port);
port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
break;
default: //to silence the compiler
break;
}
}
}
/**
* ad_tx_machine - handle a port's tx state machine
* @port: the port we're looking at
*
*/
static void ad_tx_machine(struct port *port)
{
// check if tx timer expired, to verify that we do not send more than 3 packets per second
if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
// check if there is something to send
if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
__update_lacpdu_from_port(port);
if (ad_lacpdu_send(port) >= 0) {
pr_debug("Sent LACPDU on port %d\n",
port->actor_port_number);
/* mark ntt as false, so it will not be sent again until
demanded */
port->ntt = false;
}
}
// restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
port->sm_tx_timer_counter =
ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
}
}
/**
* ad_periodic_machine - handle a port's periodic state machine
* @port: the port we're looking at
*
* Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
*/
static void ad_periodic_machine(struct port *port)
{
periodic_states_t last_state;
// keep current state machine state to compare later if it was changed
last_state = port->sm_periodic_state;
// check if port was reinitialized
if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
(!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
) {
port->sm_periodic_state = AD_NO_PERIODIC; // next state
}
// check if state machine should change state
else if (port->sm_periodic_timer_counter) {
// check if periodic state machine expired
if (!(--port->sm_periodic_timer_counter)) {
// if expired then do tx
port->sm_periodic_state = AD_PERIODIC_TX; // next state
} else {
// If not expired, check if there is some new timeout parameter from the partner state
switch (port->sm_periodic_state) {
case AD_FAST_PERIODIC:
if (!(port->partner_oper.port_state
& AD_STATE_LACP_TIMEOUT))
port->sm_periodic_state = AD_SLOW_PERIODIC; // next state
break;
case AD_SLOW_PERIODIC:
if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
// stop current timer
port->sm_periodic_timer_counter = 0;
port->sm_periodic_state = AD_PERIODIC_TX; // next state
}
break;
default: //to silence the compiler
break;
}
}
} else {
switch (port->sm_periodic_state) {
case AD_NO_PERIODIC:
port->sm_periodic_state = AD_FAST_PERIODIC; // next state
break;
case AD_PERIODIC_TX:
if (!(port->partner_oper.port_state
& AD_STATE_LACP_TIMEOUT))
port->sm_periodic_state = AD_SLOW_PERIODIC; // next state
else
port->sm_periodic_state = AD_FAST_PERIODIC; // next state
break;
default: //to silence the compiler
break;
}
}
// check if the state machine was changed
if (port->sm_periodic_state != last_state) {
pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
port->actor_port_number, last_state,
port->sm_periodic_state);
switch (port->sm_periodic_state) {
case AD_NO_PERIODIC:
port->sm_periodic_timer_counter = 0; // zero timer
break;
case AD_FAST_PERIODIC:
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
break;
case AD_SLOW_PERIODIC:
port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
break;
case AD_PERIODIC_TX:
port->ntt = true;
break;
default: //to silence the compiler
break;
}
}
}
/**
* ad_port_selection_logic - select aggregation groups
* @port: the port we're looking at
*
* Select aggregation groups, and assign each port for it's aggregetor. The
* selection logic is called in the inititalization (after all the handshkes),
* and after every lacpdu receive (if selected is off).
*/
static void ad_port_selection_logic(struct port *port)
{
struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
struct port *last_port = NULL, *curr_port;
struct list_head *iter;
struct bonding *bond;
struct slave *slave;
int found = 0;
// if the port is already Selected, do nothing
if (port->sm_vars & AD_PORT_SELECTED)
return;
bond = __get_bond_by_port(port);
// if the port is connected to other aggregator, detach it
if (port->aggregator) {
// detach the port from its former aggregator
temp_aggregator = port->aggregator;
for (curr_port = temp_aggregator->lag_ports; curr_port;
last_port = curr_port,
curr_port = curr_port->next_port_in_aggregator) {
if (curr_port == port) {
temp_aggregator->num_of_ports--;
if (!last_port) {// if it is the first port attached to the aggregator
temp_aggregator->lag_ports =
port->next_port_in_aggregator;
} else {// not the first port attached to the aggregator
last_port->next_port_in_aggregator =
port->next_port_in_aggregator;
}
// clear the port's relations to this aggregator
port->aggregator = NULL;
port->next_port_in_aggregator = NULL;
port->actor_port_aggregator_identifier = 0;
pr_debug("Port %d left LAG %d\n",
port->actor_port_number,
temp_aggregator->aggregator_identifier);
// if the aggregator is empty, clear its parameters, and set it ready to be attached
if (!temp_aggregator->lag_ports)
ad_clear_agg(temp_aggregator);
break;
}
}
if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
port->slave->bond->dev->name,
port->actor_port_number,
port->slave->dev->name,
port->aggregator->aggregator_identifier);
}
}
// search on all aggregators for a suitable aggregator for this port
bond_for_each_slave(bond, slave, iter) {
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
// keep a free aggregator for later use(if needed)
if (!aggregator->lag_ports) {
if (!free_aggregator)
free_aggregator = aggregator;
continue;
}
// check if current aggregator suits us
if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
!MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
(aggregator->partner_system_priority == port->partner_oper.system_priority) &&
(aggregator->partner_oper_aggregator_key == port->partner_oper.key)
) &&
((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
!aggregator->is_individual) // but is not individual OR
)
) {
// attach to the founded aggregator
port->aggregator = aggregator;
port->actor_port_aggregator_identifier =
port->aggregator->aggregator_identifier;
port->next_port_in_aggregator = aggregator->lag_ports;
port->aggregator->num_of_ports++;
aggregator->lag_ports = port;
pr_debug("Port %d joined LAG %d(existing LAG)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
// mark this port as selected
port->sm_vars |= AD_PORT_SELECTED;
found = 1;
break;
}
}
// the port couldn't find an aggregator - attach it to a new aggregator
if (!found) {
if (free_aggregator) {
// assign port a new aggregator
port->aggregator = free_aggregator;
port->actor_port_aggregator_identifier =
port->aggregator->aggregator_identifier;
// update the new aggregator's parameters
// if port was responsed from the end-user
if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
/* if port is full duplex */
port->aggregator->is_individual = false;
else
port->aggregator->is_individual = true;
port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
port->aggregator->partner_system =
port->partner_oper.system;
port->aggregator->partner_system_priority =
port->partner_oper.system_priority;
port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
port->aggregator->receive_state = 1;
port->aggregator->transmit_state = 1;
port->aggregator->lag_ports = port;
port->aggregator->num_of_ports++;
// mark this port as selected
port->sm_vars |= AD_PORT_SELECTED;
pr_debug("Port %d joined LAG %d(new LAG)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
} else {
pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
port->slave->bond->dev->name,
port->actor_port_number, port->slave->dev->name);
}
}
// if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
// else set ready=FALSE in all aggregator's ports
__set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
aggregator = __get_first_agg(port);
ad_agg_selection_logic(aggregator);
}
/*
* Decide if "agg" is a better choice for the new active aggregator that
* the current best, according to the ad_select policy.
*/
static struct aggregator *ad_agg_selection_test(struct aggregator *best,
struct aggregator *curr)
{
/*
* 0. If no best, select current.
*
* 1. If the current agg is not individual, and the best is
* individual, select current.
*
* 2. If current agg is individual and the best is not, keep best.
*
* 3. Therefore, current and best are both individual or both not
* individual, so:
*
* 3a. If current agg partner replied, and best agg partner did not,
* select current.
*
* 3b. If current agg partner did not reply and best agg partner
* did reply, keep best.
*
* 4. Therefore, current and best both have partner replies or
* both do not, so perform selection policy:
*
* BOND_AD_COUNT: Select by count of ports. If count is equal,
* select by bandwidth.
*
* BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
*/
if (!best)
return curr;
if (!curr->is_individual && best->is_individual)
return curr;
if (curr->is_individual && !best->is_individual)
return best;
if (__agg_has_partner(curr) && !__agg_has_partner(best))
return curr;
if (!__agg_has_partner(curr) && __agg_has_partner(best))
return best;
switch (__get_agg_selection_mode(curr->lag_ports)) {
case BOND_AD_COUNT:
if (curr->num_of_ports > best->num_of_ports)
return curr;
if (curr->num_of_ports < best->num_of_ports)
return best;
/*FALLTHROUGH*/
case BOND_AD_STABLE:
case BOND_AD_BANDWIDTH:
if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
return curr;
break;
default:
pr_warning("%s: Impossible agg select mode %d\n",
curr->slave->bond->dev->name,
__get_agg_selection_mode(curr->lag_ports));
break;
}
return best;
}
static int agg_device_up(const struct aggregator *agg)
{
struct port *port = agg->lag_ports;
if (!port)
return 0;
return (netif_running(port->slave->dev) &&
netif_carrier_ok(port->slave->dev));
}
/**
* ad_agg_selection_logic - select an aggregation group for a team
* @aggregator: the aggregator we're looking at
*
* It is assumed that only one aggregator may be selected for a team.
*
* The logic of this function is to select the aggregator according to
* the ad_select policy:
*
* BOND_AD_STABLE: select the aggregator with the most ports attached to
* it, and to reselect the active aggregator only if the previous
* aggregator has no more ports related to it.
*
* BOND_AD_BANDWIDTH: select the aggregator with the highest total
* bandwidth, and reselect whenever a link state change takes place or the
* set of slaves in the bond changes.
*
* BOND_AD_COUNT: select the aggregator with largest number of ports
* (slaves), and reselect whenever a link state change takes place or the
* set of slaves in the bond changes.
*
* FIXME: this function MUST be called with the first agg in the bond, or
* __get_active_agg() won't work correctly. This function should be better
* called with the bond itself, and retrieve the first agg from it.
*/
static void ad_agg_selection_logic(struct aggregator *agg)
{
struct aggregator *best, *active, *origin;
struct bonding *bond = agg->slave->bond;
struct list_head *iter;
struct slave *slave;
struct port *port;
origin = agg;
active = __get_active_agg(agg);
best = (active && agg_device_up(active)) ? active : NULL;
bond_for_each_slave(bond, slave, iter) {
agg = &(SLAVE_AD_INFO(slave).aggregator);
agg->is_active = 0;
if (agg->num_of_ports && agg_device_up(agg))
best = ad_agg_selection_test(best, agg);
}
if (best &&
__get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
/*
* For the STABLE policy, don't replace the old active
* aggregator if it's still active (it has an answering
* partner) or if both the best and active don't have an
* answering partner.
*/
if (active && active->lag_ports &&
active->lag_ports->is_enabled &&
(__agg_has_partner(active) ||
(!__agg_has_partner(active) && !__agg_has_partner(best)))) {
if (!(!active->actor_oper_aggregator_key &&
best->actor_oper_aggregator_key)) {
best = NULL;
active->is_active = 1;
}
}
}
if (best && (best == active)) {
best = NULL;
active->is_active = 1;
}
// if there is new best aggregator, activate it
if (best) {
pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
best->aggregator_identifier, best->num_of_ports,
best->actor_oper_aggregator_key,
best->partner_oper_aggregator_key,
best->is_individual, best->is_active);
pr_debug("best ports %p slave %p %s\n",
best->lag_ports, best->slave,
best->slave ? best->slave->dev->name : "NULL");
bond_for_each_slave(bond, slave, iter) {
agg = &(SLAVE_AD_INFO(slave).aggregator);
pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
agg->aggregator_identifier, agg->num_of_ports,
agg->actor_oper_aggregator_key,
agg->partner_oper_aggregator_key,
agg->is_individual, agg->is_active);
}
// check if any partner replys
if (best->is_individual) {
pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
best->slave ? best->slave->bond->dev->name : "NULL");
}
best->is_active = 1;
pr_debug("LAG %d chosen as the active LAG\n",
best->aggregator_identifier);
pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
best->aggregator_identifier, best->num_of_ports,
best->actor_oper_aggregator_key,
best->partner_oper_aggregator_key,
best->is_individual, best->is_active);
// disable the ports that were related to the former active_aggregator
if (active) {
for (port = active->lag_ports; port;
port = port->next_port_in_aggregator) {
__disable_port(port);
}
}
}
/*
* if the selected aggregator is of join individuals
* (partner_system is NULL), enable their ports
*/
active = __get_active_agg(origin);
if (active) {
if (!__agg_has_partner(active)) {
for (port = active->lag_ports; port;
port = port->next_port_in_aggregator) {
__enable_port(port);
}
}
}
bond_3ad_set_carrier(bond);
}
/**
* ad_clear_agg - clear a given aggregator's parameters
* @aggregator: the aggregator we're looking at
*
*/
static void ad_clear_agg(struct aggregator *aggregator)
{
if (aggregator) {
aggregator->is_individual = false;
aggregator->actor_admin_aggregator_key = 0;
aggregator->actor_oper_aggregator_key = 0;
aggregator->partner_system = null_mac_addr;
aggregator->partner_system_priority = 0;
aggregator->partner_oper_aggregator_key = 0;
aggregator->receive_state = 0;
aggregator->transmit_state = 0;
aggregator->lag_ports = NULL;
aggregator->is_active = 0;
aggregator->num_of_ports = 0;
pr_debug("LAG %d was cleared\n",
aggregator->aggregator_identifier);
}
}
/**
* ad_initialize_agg - initialize a given aggregator's parameters
* @aggregator: the aggregator we're looking at
*
*/
static void ad_initialize_agg(struct aggregator *aggregator)
{
if (aggregator) {
ad_clear_agg(aggregator);
aggregator->aggregator_mac_address = null_mac_addr;
aggregator->aggregator_identifier = 0;
aggregator->slave = NULL;
}
}
/**
* ad_initialize_port - initialize a given port's parameters
* @aggregator: the aggregator we're looking at
* @lacp_fast: boolean. whether fast periodic should be used
*
*/
static void ad_initialize_port(struct port *port, int lacp_fast)
{
static const struct port_params tmpl = {
.system_priority = 0xffff,
.key = 1,
.port_number = 1,
.port_priority = 0xff,
.port_state = 1,
};
static const struct lacpdu lacpdu = {
.subtype = 0x01,
.version_number = 0x01,
.tlv_type_actor_info = 0x01,
.actor_information_length = 0x14,
.tlv_type_partner_info = 0x02,
.partner_information_length = 0x14,
.tlv_type_collector_info = 0x03,
.collector_information_length = 0x10,
.collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
};
if (port) {
port->actor_port_number = 1;
port->actor_port_priority = 0xff;
port->actor_system = null_mac_addr;
port->actor_system_priority = 0xffff;
port->actor_port_aggregator_identifier = 0;
port->ntt = false;
port->actor_admin_port_key = 1;
port->actor_oper_port_key = 1;
port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
port->actor_oper_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
if (lacp_fast)
port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
port->is_enabled = true;
// ****** private parameters ******
port->sm_vars = 0x3;
port->sm_rx_state = 0;
port->sm_rx_timer_counter = 0;
port->sm_periodic_state = 0;
port->sm_periodic_timer_counter = 0;
port->sm_mux_state = 0;
port->sm_mux_timer_counter = 0;
port->sm_tx_state = 0;
port->sm_tx_timer_counter = 0;
port->slave = NULL;
port->aggregator = NULL;
port->next_port_in_aggregator = NULL;
port->transaction_id = 0;
memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
}
}
/**
* ad_enable_collecting_distributing - enable a port's transmit/receive
* @port: the port we're looking at
*
* Enable @port if it's in an active aggregator
*/
static void ad_enable_collecting_distributing(struct port *port)
{
if (port->aggregator->is_active) {
pr_debug("Enabling port %d(LAG %d)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
__enable_port(port);
}
}
/**
* ad_disable_collecting_distributing - disable a port's transmit/receive
* @port: the port we're looking at
*
*/
static void ad_disable_collecting_distributing(struct port *port)
{
if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
pr_debug("Disabling port %d(LAG %d)\n",
port->actor_port_number,
port->aggregator->aggregator_identifier);
__disable_port(port);
}
}
#if 0
/**
* ad_marker_info_send - send a marker information frame
* @port: the port we're looking at
*
* This function does nothing since we decided not to implement send and handle
* response for marker PDU's, in this stage, but only to respond to marker
* information.
*/
static void ad_marker_info_send(struct port *port)
{
struct bond_marker marker;
u16 index;
// fill the marker PDU with the appropriate values
marker.subtype = 0x02;
marker.version_number = 0x01;
marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
marker.marker_length = 0x16;
// convert requester_port to Big Endian
marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
marker.requester_system = port->actor_system;
// convert requester_port(u32) to Big Endian
marker.requester_transaction_id =
(((++port->transaction_id & 0xFF) << 24)
| ((port->transaction_id & 0xFF00) << 8)
| ((port->transaction_id & 0xFF0000) >> 8)
| ((port->transaction_id & 0xFF000000) >> 24));
marker.pad = 0;
marker.tlv_type_terminator = 0x00;
marker.terminator_length = 0x00;
for (index = 0; index < 90; index++)
marker.reserved_90[index] = 0;
// send the marker information
if (ad_marker_send(port, &marker) >= 0) {
pr_debug("Sent Marker Information on port %d\n",
port->actor_port_number);
}
}
#endif
/**
* ad_marker_info_received - handle receive of a Marker information frame
* @marker_info: Marker info received
* @port: the port we're looking at
*
*/
static void ad_marker_info_received(struct bond_marker *marker_info,
struct port *port)
{
struct bond_marker marker;
// copy the received marker data to the response marker
//marker = *marker_info;
memcpy(&marker, marker_info, sizeof(struct bond_marker));
// change the marker subtype to marker response
marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
// send the marker response
if (ad_marker_send(port, &marker) >= 0) {
pr_debug("Sent Marker Response on port %d\n",
port->actor_port_number);
}
}
/**
* ad_marker_response_received - handle receive of a marker response frame
* @marker: marker PDU received
* @port: the port we're looking at
*
* This function does nothing since we decided not to implement send and handle
* response for marker PDU's, in this stage, but only to respond to marker
* information.
*/
static void ad_marker_response_received(struct bond_marker *marker,
struct port *port)
{
marker = NULL; /* just to satisfy the compiler */
port = NULL; /* just to satisfy the compiler */
// DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
}
//////////////////////////////////////////////////////////////////////////////////////
// ================= AD exported functions to the main bonding code ==================
//////////////////////////////////////////////////////////////////////////////////////
// Check aggregators status in team every T seconds
#define AD_AGGREGATOR_SELECTION_TIMER 8
/*
* bond_3ad_initiate_agg_selection(struct bonding *bond)
*
* Set the aggregation selection timer, to initiate an agg selection in
* the very near future. Called during first initialization, and during
* any down to up transitions of the bond.
*/
void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
{
BOND_AD_INFO(bond).agg_select_timer = timeout;
}
static u16 aggregator_identifier;
/**
* bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
* @bond: bonding struct to work on
* @tick_resolution: tick duration (millisecond resolution)
*
* Can be called only after the mac address of the bond is set.
*/
void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
{
// check that the bond is not initialized yet
if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
bond->dev->dev_addr)) {
aggregator_identifier = 0;
BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
// initialize how many times this module is called in one second(should be about every 100ms)
ad_ticks_per_sec = tick_resolution;
bond_3ad_initiate_agg_selection(bond,
AD_AGGREGATOR_SELECTION_TIMER *
ad_ticks_per_sec);
}
}
/**
* bond_3ad_bind_slave - initialize a slave's port
* @slave: slave struct to work on
*
* Returns: 0 on success
* < 0 on error
*/
int bond_3ad_bind_slave(struct slave *slave)
{
struct bonding *bond = bond_get_bond_by_slave(slave);
struct port *port;
struct aggregator *aggregator;
if (bond == NULL) {
pr_err("%s: The slave %s is not attached to its bond\n",
slave->bond->dev->name, slave->dev->name);
return -1;
}
//check that the slave has not been initialized yet.
if (SLAVE_AD_INFO(slave).port.slave != slave) {
// port initialization
port = &(SLAVE_AD_INFO(slave).port);
ad_initialize_port(port, bond->params.lacp_fast);
__initialize_port_locks(slave);
port->slave = slave;
port->actor_port_number = SLAVE_AD_INFO(slave).id;
// key is determined according to the link speed, duplex and user key(which is yet not supported)
// ------------------------------------------------------------
// Port 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);
// 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;
struct bonding *bond = slave->bond;
struct slave *slave_iter;
struct list_head *iter;
// find the aggregator related to this slave
aggregator = &(SLAVE_AD_INFO(slave).aggregator);
// find the port related to this slave
port = &(SLAVE_AD_INFO(slave).port);
// if slave is null, the whole port is not initialized
if (!port->slave) {
pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
pr_debug("Unbinding Link Aggregation Group %d\n",
aggregator->aggregator_identifier);
/* Tell the partner that this port is not suitable for aggregation */
port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
__update_lacpdu_from_port(port);
ad_lacpdu_send(port);
// check if this aggregator is occupied
if (aggregator->lag_ports) {
// check if there are other ports related to this aggregator except
// the port related to this slave(thats ensure us that there is a
// reason to search for new aggregator, and that we will find one
if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
// find new aggregator for the related port(s)
bond_for_each_slave(bond, slave_iter, iter) {
new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
// if the new aggregator is empty, or it is connected to our port only
if (!new_aggregator->lag_ports
|| ((new_aggregator->lag_ports == port)
&& !new_aggregator->lag_ports->next_port_in_aggregator))
break;
}
if (!slave_iter)
new_aggregator = NULL;
// if new aggregator found, copy the aggregator's parameters
// and connect the related lag_ports to the new aggregator
if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
aggregator->aggregator_identifier,
new_aggregator->aggregator_identifier);
if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
pr_info("%s: Removing an active aggregator\n",
aggregator->slave->bond->dev->name);
// select new active aggregator
select_new_active_agg = 1;
}
new_aggregator->is_individual = aggregator->is_individual;
new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
new_aggregator->partner_system = aggregator->partner_system;
new_aggregator->partner_system_priority = aggregator->partner_system_priority;
new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
new_aggregator->receive_state = aggregator->receive_state;
new_aggregator->transmit_state = aggregator->transmit_state;
new_aggregator->lag_ports = aggregator->lag_ports;
new_aggregator->is_active = aggregator->is_active;
new_aggregator->num_of_ports = aggregator->num_of_ports;
// update the information that is written on the ports about the aggregator
for (temp_port = aggregator->lag_ports; temp_port;
temp_port = temp_port->next_port_in_aggregator) {
temp_port->aggregator = new_aggregator;
temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
}
// clear the aggregator
ad_clear_agg(aggregator);
if (select_new_active_agg)
ad_agg_selection_logic(__get_first_agg(port));
} else {
pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
slave->bond->dev->name);
}
} else { // in case that the only port related to this aggregator is the one we want to remove
select_new_active_agg = aggregator->is_active;
// clear the aggregator
ad_clear_agg(aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->bond->dev->name);
// select new active aggregator
temp_aggregator = __get_first_agg(port);
if (temp_aggregator)
ad_agg_selection_logic(temp_aggregator);
}
}
}
pr_debug("Unbinding port %d\n", port->actor_port_number);
// find the aggregator that this port is connected to
bond_for_each_slave(bond, slave_iter, iter) {
temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
prev_port = NULL;
// search the port in the aggregator's related ports
for (temp_port = temp_aggregator->lag_ports; temp_port;
prev_port = temp_port,
temp_port = temp_port->next_port_in_aggregator) {
if (temp_port == port) { // the aggregator found - detach the port from this aggregator
if (prev_port)
prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
else
temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
temp_aggregator->num_of_ports--;
if (temp_aggregator->num_of_ports == 0) {
select_new_active_agg = temp_aggregator->is_active;
// clear the aggregator
ad_clear_agg(temp_aggregator);
if (select_new_active_agg) {
pr_info("%s: Removing an active aggregator\n",
slave->bond->dev->name);
// select new active aggregator
ad_agg_selection_logic(__get_first_agg(port));
}
}
break;
}
}
}
port->slave = NULL;
}
/**
* bond_3ad_state_machine_handler - handle state machines timeout
* @bond: bonding struct to work on
*
* The state machine handling concept in this module is to check every tick
* which state machine should operate any function. The execution order is
* round robin, so when we have an interaction between state machines, the
* reply of one to each other might be delayed until next tick.
*
* This function also complete the initialization when the agg_select_timer
* times out, and it selects an aggregator for the ports that are yet not
* related to any aggregator, and selects the active aggregator for a bond.
*/
void bond_3ad_state_machine_handler(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
ad_work.work);
struct aggregator *aggregator;
struct list_head *iter;
struct slave *slave;
struct port *port;
read_lock(&bond->lock);
//check if there are any slaves
if (!bond_has_slaves(bond))
goto re_arm;
// check if agg_select_timer timer after initialize is timed out
if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
slave = bond_first_slave(bond);
port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
// select the active aggregator for the bond
if (port) {
if (!port->slave) {
pr_warning("%s: Warning: bond's first port is uninitialized\n",
bond->dev->name);
goto re_arm;
}
aggregator = __get_first_agg(port);
ad_agg_selection_logic(aggregator);
}
bond_3ad_set_carrier(bond);
}
// for each port run the state machines
bond_for_each_slave(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
if (!port->slave) {
pr_warning("%s: Warning: Found an uninitialized port\n",
bond->dev->name);
goto re_arm;
}
/* Lock around state machines to protect data accessed
* by all (e.g., port->sm_vars). ad_rx_machine may run
* concurrently due to incoming LACPDU.
*/
__get_state_machine_lock(port);
ad_rx_machine(NULL, port);
ad_periodic_machine(port);
ad_port_selection_logic(port);
ad_mux_machine(port);
ad_tx_machine(port);
// turn off the BEGIN bit, since we already handled it
if (port->sm_vars & AD_PORT_BEGIN)
port->sm_vars &= ~AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
re_arm:
queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
read_unlock(&bond->lock);
}
/**
* bond_3ad_rx_indication - handle a received frame
* @lacpdu: received lacpdu
* @slave: slave struct to work on
* @length: length of the data received
*
* It is assumed that frames that were sent on this NIC don't returned as new
* received frames (loopback). Since only the payload is given to this
* function, it check for loopback.
*/
static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
{
struct port *port;
int ret = RX_HANDLER_ANOTHER;
if (length >= sizeof(struct lacpdu)) {
port = &(SLAVE_AD_INFO(slave).port);
if (!port->slave) {
pr_warning("%s: Warning: port of slave %s is uninitialized\n",
slave->dev->name, slave->bond->dev->name);
return ret;
}
switch (lacpdu->subtype) {
case AD_TYPE_LACPDU:
ret = RX_HANDLER_CONSUMED;
pr_debug("Received LACPDU on port %d\n",
port->actor_port_number);
/* Protect against concurrent state machines */
__get_state_machine_lock(port);
ad_rx_machine(lacpdu, port);
__release_state_machine_lock(port);
break;
case AD_TYPE_MARKER:
ret = RX_HANDLER_CONSUMED;
// No need to convert fields to Little Endian since we don't use the marker's fields.
switch (((struct bond_marker *)lacpdu)->tlv_type) {
case AD_MARKER_INFORMATION_SUBTYPE:
pr_debug("Received Marker Information on port %d\n",
port->actor_port_number);
ad_marker_info_received((struct bond_marker *)lacpdu, port);
break;
case AD_MARKER_RESPONSE_SUBTYPE:
pr_debug("Received Marker Response on port %d\n",
port->actor_port_number);
ad_marker_response_received((struct bond_marker *)lacpdu, port);
break;
default:
pr_debug("Received an unknown Marker subtype on slot %d\n",
port->actor_port_number);
}
}
}
return ret;
}
/**
* bond_3ad_adapter_speed_changed - handle a slave's speed change indication
* @slave: slave struct to work on
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_adapter_speed_changed(struct slave *slave)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
(__get_link_speed(port) << 1);
pr_debug("Port %d changed speed\n", port->actor_port_number);
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/**
* bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
* @slave: slave struct to work on
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_adapter_duplex_changed(struct slave *slave)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
__get_duplex(port);
pr_debug("Port %d changed duplex\n", port->actor_port_number);
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/**
* bond_3ad_handle_link_change - handle a slave's link status change indication
* @slave: slave struct to work on
* @status: whether the link is now up or down
*
* Handle reselection of aggregator (if needed) for this port.
*/
void bond_3ad_handle_link_change(struct slave *slave, char link)
{
struct port *port;
port = &(SLAVE_AD_INFO(slave).port);
/* if slave is null, the whole port is not initialized */
if (!port->slave) {
pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
slave->bond->dev->name, slave->dev->name);
return;
}
__get_state_machine_lock(port);
/* on link down we are zeroing duplex and speed since
* some of the adaptors(ce1000.lan) report full duplex/speed
* instead of N/A(duplex) / 0(speed).
*
* on link up we are forcing recheck on the duplex and speed since
* some of he adaptors(ce1000.lan) report.
*/
if (link == BOND_LINK_UP) {
port->is_enabled = true;
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
__get_duplex(port);
port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
port->actor_oper_port_key = port->actor_admin_port_key |=
(__get_link_speed(port) << 1);
} else {
/* link has failed */
port->is_enabled = false;
port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
port->actor_oper_port_key = (port->actor_admin_port_key &=
~AD_SPEED_KEY_BITS);
}
pr_debug("Port %d changed link status to %s",
port->actor_port_number,
(link == BOND_LINK_UP) ? "UP" : "DOWN");
/* there is no need to reselect a new aggregator, just signal the
* state machines to reinitialize
*/
port->sm_vars |= AD_PORT_BEGIN;
__release_state_machine_lock(port);
}
/*
* set link state for bonding master: if we have an active
* aggregator, we're up, if not, we're down. Presumes that we cannot
* have an active aggregator if there are no slaves with link up.
*
* This behavior complies with IEEE 802.3 section 43.3.9.
*
* Called by bond_set_carrier(). Return zero if carrier state does not
* change, nonzero if it does.
*/
int bond_3ad_set_carrier(struct bonding *bond)
{
struct aggregator *active;
struct slave *first_slave;
first_slave = bond_first_slave(bond);
if (!first_slave)
return 0;
active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
if (active) {
/* are enough slaves available to consider link up? */
if (active->num_of_ports < bond->params.min_links) {
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
return 1;
}
} else if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
return 1;
}
return 0;
}
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
return 1;
}
return 0;
}
/**
* __bond_3ad_get_active_agg_info - get information of the active aggregator
* @bond: bonding struct to work on
* @ad_info: ad_info struct to fill with the bond's info
*
* Returns: 0 on success
* < 0 on error
*/
int __bond_3ad_get_active_agg_info(struct bonding *bond,
struct ad_info *ad_info)
{
struct aggregator *aggregator = NULL;
struct list_head *iter;
struct slave *slave;
struct port *port;
bond_for_each_slave_rcu(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
if (port->aggregator && port->aggregator->is_active) {
aggregator = port->aggregator;
break;
}
}
if (aggregator) {
ad_info->aggregator_id = aggregator->aggregator_identifier;
ad_info->ports = aggregator->num_of_ports;
ad_info->actor_key = aggregator->actor_oper_aggregator_key;
ad_info->partner_key = aggregator->partner_oper_aggregator_key;
memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
return 0;
}
return -1;
}
/* Wrapper used to hold bond->lock so no slave manipulation can occur */
int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
{
int ret;
rcu_read_lock();
ret = __bond_3ad_get_active_agg_info(bond, ad_info);
rcu_read_unlock();
return ret;
}
int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
{
struct bonding *bond = netdev_priv(dev);
struct slave *slave, *first_ok_slave;
struct aggregator *agg;
struct ad_info ad_info;
struct list_head *iter;
int slaves_in_agg;
int slave_agg_no;
int res = 1;
int agg_id;
if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
dev->name);
goto out;
}
slaves_in_agg = ad_info.ports;
agg_id = ad_info.aggregator_id;
if (slaves_in_agg == 0) {
pr_debug("%s: Error: active aggregator is empty\n", dev->name);
goto out;
}
slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
first_ok_slave = NULL;
bond_for_each_slave_rcu(bond, slave, iter) {
agg = SLAVE_AD_INFO(slave).port.aggregator;
if (!agg || agg->aggregator_identifier != agg_id)
continue;
if (slave_agg_no >= 0) {
if (!first_ok_slave && SLAVE_IS_OK(slave))
first_ok_slave = slave;
slave_agg_no--;
continue;
}
if (SLAVE_IS_OK(slave)) {
res = bond_dev_queue_xmit(bond, skb, slave->dev);
goto out;
}
}
if (slave_agg_no >= 0) {
pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
dev->name, agg_id);
goto out;
}
/* we couldn't find any suitable slave after the agg_no, so use the
* first suitable found, if found. */
if (first_ok_slave)
res = bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
out:
if (res) {
/* no suitable interface, frame not sent */
kfree_skb(skb);
}
return NETDEV_TX_OK;
}
int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
int ret = RX_HANDLER_ANOTHER;
struct lacpdu *lacpdu, _lacpdu;
if (skb->protocol != PKT_TYPE_LACPDU)
return ret;
lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
if (!lacpdu)
return ret;
read_lock(&bond->lock);
ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
read_unlock(&bond->lock);
return ret;
}
/*
* When modify lacp_rate parameter via sysfs,
* update actor_oper_port_state of each port.
*
* Hold slave->state_machine_lock,
* so we can modify port->actor_oper_port_state,
* no matter bond is up or down.
*/
void bond_3ad_update_lacp_rate(struct bonding *bond)
{
struct port *port = NULL;
struct list_head *iter;
struct slave *slave;
int lacp_fast;
lacp_fast = bond->params.lacp_fast;
bond_for_each_slave(bond, slave, iter) {
port = &(SLAVE_AD_INFO(slave).port);
__get_state_machine_lock(port);
if (lacp_fast)
port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
else
port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
__release_state_machine_lock(port);
}
}
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