/* * Copyright (c) 2016, The Linux Foundation. All rights reserved. * * 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. * */ #include #include #include #include #include #include #include #include #include #include #include /* 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 #define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN) /* Port Key definitions * key is determined according to the link speed, duplex and * user key (which is yet not supported) * -------------------------------------------------------------- * Port key | User key (10 bits) | Speed (5 bits) | Duplex| * -------------------------------------------------------------- * |15 6|5 1|0 */ #define AD_DUPLEX_KEY_MASKS 0x1 #define AD_SPEED_KEY_MASKS 0x3E #define AD_USER_KEY_MASKS 0xFFC0 enum ad_link_speed_type { AD_LINK_SPEED_1MBPS = 1, AD_LINK_SPEED_10MBPS, AD_LINK_SPEED_100MBPS, AD_LINK_SPEED_1000MBPS, AD_LINK_SPEED_2500MBPS, AD_LINK_SPEED_10000MBPS, AD_LINK_SPEED_20000MBPS, AD_LINK_SPEED_40000MBPS, AD_LINK_SPEED_56000MBPS }; /* compare MAC addresses */ #define MAC_ADDRESS_EQUAL(A, B) \ ether_addr_equal_64bits((const u8 *)A, (const u8 *)B) static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } }; static u16 ad_ticks_per_sec; static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR; /* ================= main 802.3ad protocol functions ================== */ static int ad_lacpdu_send(struct port *port); static int ad_marker_send(struct port *port, struct bond_marker *marker); static void ad_mux_machine(struct port *port, bool *update_slave_arr); 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, bool *update_slave_arr); static void ad_agg_selection_logic(struct aggregator *aggregator, bool *update_slave_arr); 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, bool *update_slave_arr); static void ad_disable_collecting_distributing(struct port *port, bool *update_slave_arr); 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); static void ad_update_actor_keys(struct port *port, bool reset); struct bond_cb __rcu *bond_cb; int bond_register_cb(struct bond_cb *cb) { struct bond_cb *lag_cb; rcu_read_lock(); lag_cb = kzalloc(sizeof(*lag_cb), GFP_ATOMIC | __GFP_NOWARN); if (!lag_cb) { rcu_read_unlock(); return -1; } memcpy((void *)lag_cb, (void *)cb, sizeof(*cb)); rcu_assign_pointer(bond_cb, lag_cb); rcu_read_unlock(); return 0; } EXPORT_SYMBOL(bond_register_cb); void bond_unregister_cb(void) { struct bond_cb *lag_cb_main; rcu_read_lock(); lag_cb_main = rcu_dereference(bond_cb); kfree(lag_cb_main); rcu_assign_pointer(bond_cb, NULL); rcu_read_unlock(); } EXPORT_SYMBOL(bond_unregister_cb); /* ================= api to bonding and kernel code ================== */ /** * __get_bond_by_port - get the port's bonding struct * @port: the port we're looking at * * Return @port's bonding struct, or %NULL if it can't be found. */ static inline struct bonding *__get_bond_by_port(struct port *port) { if (port->slave == NULL) return NULL; return bond_get_bond_by_slave(port->slave); } /** * __get_first_agg - get the first aggregator in the bond * @bond: the bond we're looking at * * Return the aggregator of the first slave in @bond, or %NULL if it can't be * found. * The caller must hold RCU or RTNL lock. */ static inline struct aggregator *__get_first_agg(struct port *port) { struct bonding *bond = __get_bond_by_port(port); struct slave *first_slave; struct aggregator *agg; /* If there's no bond for this port, or bond has no slaves */ if (bond == NULL) return NULL; rcu_read_lock(); first_slave = bond_first_slave_rcu(bond); agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL; rcu_read_unlock(); return agg; } /** * __agg_has_partner - see if we have a partner * @agg: the agregator we're looking at * * Return nonzero if aggregator has a partner (denoted by a non-zero ether * address for the partner). Return 0 if not. */ static inline int __agg_has_partner(struct aggregator *agg) { return !is_zero_ether_addr(agg->partner_system.mac_addr_value); } /** * __disable_port - disable the port's slave * @port: the port we're looking at */ static inline void __disable_port(struct port *port) { bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); } /** * __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) && bond_slave_is_up(slave)) bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER); } /** * __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_link_speed - get a port's speed * @port: the port we're looking at * * Return @port's speed in 802.3ad enum format. i.e. one of: * 0, * %AD_LINK_SPEED_10MBPS, * %AD_LINK_SPEED_100MBPS, * %AD_LINK_SPEED_1000MBPS, * %AD_LINK_SPEED_2500MBPS, * %AD_LINK_SPEED_10000MBPS * %AD_LINK_SPEED_20000MBPS * %AD_LINK_SPEED_40000MBPS * %AD_LINK_SPEED_56000MBPS */ 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_10MBPS; break; case SPEED_100: speed = AD_LINK_SPEED_100MBPS; break; case SPEED_1000: speed = AD_LINK_SPEED_1000MBPS; break; case SPEED_2500: speed = AD_LINK_SPEED_2500MBPS; break; case SPEED_10000: speed = AD_LINK_SPEED_10000MBPS; break; case SPEED_20000: speed = AD_LINK_SPEED_20000MBPS; break; case SPEED_40000: speed = AD_LINK_SPEED_40000MBPS; break; case SPEED_56000: speed = AD_LINK_SPEED_56000MBPS; break; default: /* unknown speed value from ethtool. shouldn't happen */ speed = 0; break; } } netdev_dbg(slave->bond->dev, "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 = 0x0; /* handling a special case: when the configuration starts with * link down, it sets the duplex to 0. */ if (slave->link == BOND_LINK_UP) { switch (slave->duplex) { case DUPLEX_FULL: retval = 0x1; netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n", port->actor_port_number); break; case DUPLEX_HALF: default: retval = 0x0; netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number); break; } } return retval; } /* Conversions */ /** * __ad_timer_to_ticks - convert a given timer type to AD module ticks * @timer_type: which timer to operate * @par: timer parameter. see below * * If @timer_type is %current_while_timer, @par indicates long/short timer. * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME, * %SLOW_PERIODIC_TIME. */ static u16 __ad_timer_to_ticks(u16 timer_type, u16 par) { u16 retval = 0; /* to silence the compiler */ switch (timer_type) { case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */ if (par) retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); else retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); break; case AD_ACTOR_CHURN_TIMER: /* for local churn machine */ retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); break; case AD_PERIODIC_TIMER: /* for periodic machine */ retval = (par*ad_ticks_per_sec); /* long timeout */ break; case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */ retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); break; case AD_WAIT_WHILE_TIMER: /* for selection machine */ retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec); break; } return retval; } /* ================= ad_rx_machine helper functions ================== */ /** * __choose_matched - update a port's matched variable from a received lacpdu * @lacpdu: the lacpdu we've received * @port: the port we're looking at * * Update the value of the matched variable, using parameter values from a * newly received lacpdu. Parameter values for the partner carried in the * received PDU are compared with the corresponding operational parameter * values for the actor. Matched is set to TRUE if all of these parameters * match and the PDU parameter partner_state.aggregation has the same value as * actor_oper_port_state.aggregation and lacp will actively maintain the link * in the aggregation. Matched is also set to TRUE if the value of * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates * an individual link and lacp will actively maintain the link. Otherwise, * matched is set to FALSE. LACP is considered to be actively maintaining the * link if either the PDU's actor_state.lacp_activity variable is TRUE or both * the actor's actor_oper_port_state.lacp_activity and the PDU's * partner_state.lacp_activity variables are TRUE. * * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is * used here to implement the language from 802.3ad 43.4.9 that requires * recordPDU to "match" the LACPDU parameters to the stored values. */ static void __choose_matched(struct lacpdu *lacpdu, struct port *port) { /* check if all parameters are alike * or this is individual link(aggregation == FALSE) * then update the state machine Matched variable. */ if (((ntohs(lacpdu->partner_port) == port->actor_port_number) && (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) && MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) && (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) && (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) && ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) || ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0) ) { port->sm_vars |= AD_PORT_MATCHED; } else { port->sm_vars &= ~AD_PORT_MATCHED; } } /** * __record_pdu - record parameters from a received lacpdu * @lacpdu: the lacpdu we've received * @port: the port we're looking at * * Record the parameter values for the Actor carried in a received lacpdu as * the current partner operational parameter values and sets * actor_oper_port_state.defaulted to FALSE. */ static void __record_pdu(struct lacpdu *lacpdu, struct port *port) { if (lacpdu && port) { struct port_params *partner = &port->partner_oper; __choose_matched(lacpdu, port); /* record the new parameter values for the partner * operational */ partner->port_number = ntohs(lacpdu->actor_port); partner->port_priority = ntohs(lacpdu->actor_port_priority); partner->system = lacpdu->actor_system; partner->system_priority = ntohs(lacpdu->actor_system_priority); partner->key = ntohs(lacpdu->actor_key); partner->port_state = lacpdu->actor_state; /* set actor_oper_port_state.defaulted to FALSE */ port->actor_oper_port_state &= ~AD_STATE_DEFAULTED; /* set the partner sync. to on if the partner is sync, * and the port is matched */ if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) { partner->port_state |= AD_STATE_SYNCHRONIZATION; pr_debug("%s partner sync=1\n", port->slave->dev->name); } else { partner->port_state &= ~AD_STATE_SYNCHRONIZATION; pr_debug("%s partner sync=0\n", port->slave->dev->name); } } } /** * __record_default - record default parameters * @port: the port we're looking at * * This function records the default parameter values for the partner carried * in the Partner Admin parameters as the current partner operational parameter * values and sets actor_oper_port_state.defaulted to TRUE. */ static void __record_default(struct port *port) { if (port) { /* record the partner admin parameters */ memcpy(&port->partner_oper, &port->partner_admin, sizeof(struct port_params)); /* set actor_oper_port_state.defaulted to true */ port->actor_oper_port_state |= AD_STATE_DEFAULTED; } } /** * __update_selected - update a port's Selected variable from a received lacpdu * @lacpdu: the lacpdu we've received * @port: the port we're looking at * * Update the value of the selected variable, using parameter values from a * newly received lacpdu. The parameter values for the Actor carried in the * received PDU are compared with the corresponding operational parameter * values for the ports partner. If one or more of the comparisons shows that * the value(s) received in the PDU differ from the current operational values, * then selected is set to FALSE and actor_oper_port_state.synchronization is * set to out_of_sync. Otherwise, selected remains unchanged. */ static void __update_selected(struct lacpdu *lacpdu, struct port *port) { if (lacpdu && port) { const struct port_params *partner = &port->partner_oper; /* check if any parameter is different then * update the state machine selected variable. */ if (ntohs(lacpdu->actor_port) != partner->port_number || ntohs(lacpdu->actor_port_priority) != partner->port_priority || !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) || ntohs(lacpdu->actor_system_priority) != partner->system_priority || ntohs(lacpdu->actor_key) != partner->key || (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) { port->sm_vars &= ~AD_PORT_SELECTED; } } } /** * __update_default_selected - update a port's Selected variable from Partner * @port: the port we're looking at * * This function updates the value of the selected variable, using the partner * administrative parameter values. The administrative values are compared with * the corresponding operational parameter values for the partner. If one or * more of the comparisons shows that the administrative value(s) differ from * the current operational values, then Selected is set to FALSE and * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise, * Selected remains unchanged. */ static void __update_default_selected(struct port *port) { if (port) { const struct port_params *admin = &port->partner_admin; const struct port_params *oper = &port->partner_oper; /* check if any parameter is different then * update the state machine selected variable. */ if (admin->port_number != oper->port_number || admin->port_priority != oper->port_priority || !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) || admin->system_priority != oper->system_priority || admin->key != oper->key || (admin->port_state & AD_STATE_AGGREGATION) != (oper->port_state & AD_STATE_AGGREGATION)) { port->sm_vars &= ~AD_PORT_SELECTED; } } } /** * __update_ntt - update a port's ntt variable from a received lacpdu * @lacpdu: the lacpdu we've received * @port: the port we're looking at * * Updates the value of the ntt variable, using parameter values from a newly * received lacpdu. The parameter values for the partner carried in the * received PDU are compared with the corresponding operational parameter * values for the Actor. If one or more of the comparisons shows that the * value(s) received in the PDU differ from the current operational values, * then ntt is set to TRUE. Otherwise, ntt remains unchanged. */ static void __update_ntt(struct lacpdu *lacpdu, struct port *port) { /* validate lacpdu and port */ if (lacpdu && port) { /* check if any parameter is different then * update the port->ntt. */ if ((ntohs(lacpdu->partner_port) != port->actor_port_number) || (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) || !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) || (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) || (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) || ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) || ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) || ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) || ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION)) ) { port->ntt = true; } } } /** * __agg_ports_are_ready - check if all ports in an aggregator are ready * @aggregator: the aggregator we're looking at * */ static int __agg_ports_are_ready(struct aggregator *aggregator) { struct port *port; int retval = 1; if (aggregator) { /* scan all ports in this aggregator to verfy if they are * all ready. */ for (port = aggregator->lag_ports; port; port = port->next_port_in_aggregator) { if (!(port->sm_vars & AD_PORT_READY_N)) { retval = 0; break; } } } return retval; } /** * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator * @aggregator: the aggregator we're looking at * @val: Should the ports' ready bit be set on or off * */ static void __set_agg_ports_ready(struct aggregator *aggregator, int val) { struct port *port; for (port = aggregator->lag_ports; port; port = port->next_port_in_aggregator) { if (val) port->sm_vars |= AD_PORT_READY; else port->sm_vars &= ~AD_PORT_READY; } } /** * __get_agg_bandwidth - get the total bandwidth of an aggregator * @aggregator: the aggregator we're looking at * */ static u32 __get_agg_bandwidth(struct aggregator *aggregator) { u32 bandwidth = 0; if (aggregator->num_of_ports) { switch (__get_link_speed(aggregator->lag_ports)) { case AD_LINK_SPEED_1MBPS: bandwidth = aggregator->num_of_ports; break; case AD_LINK_SPEED_10MBPS: bandwidth = aggregator->num_of_ports * 10; break; case AD_LINK_SPEED_100MBPS: bandwidth = aggregator->num_of_ports * 100; break; case AD_LINK_SPEED_1000MBPS: bandwidth = aggregator->num_of_ports * 1000; break; case AD_LINK_SPEED_2500MBPS: bandwidth = aggregator->num_of_ports * 2500; break; case AD_LINK_SPEED_10000MBPS: bandwidth = aggregator->num_of_ports * 10000; break; case AD_LINK_SPEED_20000MBPS: bandwidth = aggregator->num_of_ports * 20000; break; case AD_LINK_SPEED_40000MBPS: bandwidth = aggregator->num_of_ports * 40000; break; case AD_LINK_SPEED_56000MBPS: bandwidth = aggregator->num_of_ports * 56000; break; default: bandwidth = 0; /* to silence the compiler */ } } return bandwidth; } /** * __get_active_agg - get the current active aggregator * @aggregator: the aggregator we're looking at * * Caller must hold RCU lock. */ static struct aggregator *__get_active_agg(struct aggregator *aggregator) { struct bonding *bond = aggregator->slave->bond; struct list_head *iter; struct slave *slave; bond_for_each_slave_rcu(bond, slave, iter) if (SLAVE_AD_INFO(slave)->aggregator.is_active) return &(SLAVE_AD_INFO(slave)->aggregator); return NULL; } /** * __update_lacpdu_from_port - update a port's lacpdu fields * @port: the port we're looking at */ static inline void __update_lacpdu_from_port(struct port *port) { struct lacpdu *lacpdu = &port->lacpdu; const struct port_params *partner = &port->partner_oper; /* update current actual Actor parameters * lacpdu->subtype initialized * lacpdu->version_number initialized * lacpdu->tlv_type_actor_info initialized * lacpdu->actor_information_length initialized */ lacpdu->actor_system_priority = htons(port->actor_system_priority); lacpdu->actor_system = port->actor_system; lacpdu->actor_key = htons(port->actor_oper_port_key); lacpdu->actor_port_priority = htons(port->actor_port_priority); lacpdu->actor_port = htons(port->actor_port_number); lacpdu->actor_state = port->actor_oper_port_state; pr_debug("update lacpdu: %s, actor port state %x\n", port->slave->dev->name, 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); ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr); /* Note: source address is set to be the member's PERMANENT address, * because we use it to identify loopback lacpdus in receive. */ ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr); lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU; lacpdu_header->lacpdu = port->lacpdu; dev_queue_xmit(skb); return 0; } /** * ad_marker_send - send marker information/response on a given port * @port: the port we're looking at * @marker: marker data to send * * Returns: 0 on success * < 0 on error */ static int ad_marker_send(struct port *port, struct bond_marker *marker) { struct slave *slave = port->slave; struct sk_buff *skb; struct bond_marker_header *marker_header; int length = sizeof(struct bond_marker_header); skb = dev_alloc_skb(length + 16); if (!skb) return -ENOMEM; skb_reserve(skb, 16); skb->dev = slave->dev; skb_reset_mac_header(skb); skb->network_header = skb->mac_header + ETH_HLEN; skb->protocol = PKT_TYPE_LACPDU; marker_header = (struct bond_marker_header *)skb_put(skb, length); ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr); /* Note: source address is set to be the member's PERMANENT address, * because we use it to identify loopback MARKERs in receive. */ ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr); marker_header->hdr.h_proto = PKT_TYPE_LACPDU; marker_header->marker = *marker; dev_queue_xmit(skb); return 0; } /** * ad_mux_machine - handle a port's mux state machine * @port: the port we're looking at * @update_slave_arr: Does slave array need update? */ static void ad_mux_machine(struct port *port, bool *update_slave_arr) { mux_states_t last_state; /* keep current State Machine state to compare later if it was * changed */ last_state = port->sm_mux_state; if (port->sm_vars & AD_PORT_BEGIN) { port->sm_mux_state = AD_MUX_DETACHED; } else { switch (port->sm_mux_state) { case AD_MUX_DETACHED: if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) /* if SELECTED or STANDBY */ port->sm_mux_state = AD_MUX_WAITING; break; case AD_MUX_WAITING: /* if SELECTED == FALSE return to DETACH state */ if (!(port->sm_vars & AD_PORT_SELECTED)) { port->sm_vars &= ~AD_PORT_READY_N; /* in order to withhold the Selection Logic to * check all ports READY_N value every callback * cycle to update ready variable, we check * READY_N and update READY here */ __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); port->sm_mux_state = AD_MUX_DETACHED; break; } /* check if the wait_while_timer expired */ if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) port->sm_vars |= AD_PORT_READY_N; /* in order to withhold the selection logic to check * all ports READY_N value every callback cycle to * update ready variable, we check READY_N and update * READY here */ __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); /* if the wait_while_timer expired, and the port is * in READY state, move to ATTACHED state */ if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) port->sm_mux_state = AD_MUX_ATTACHED; break; case AD_MUX_ATTACHED: /* check also if agg_select_timer expired (so the * edable port will take place only after this timer) */ if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) { if (port->aggregator->is_active) port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING; } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { /* if UNSELECTED or STANDBY */ port->sm_vars &= ~AD_PORT_READY_N; /* in order to withhold the selection logic to * check all ports READY_N value every callback * cycle to update ready variable, we check * READY_N and update READY here */ __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); port->sm_mux_state = AD_MUX_DETACHED; } else if (port->aggregator->is_active) { port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION; } 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->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) { port->sm_mux_state = AD_MUX_ATTACHED; } else { /* if port state hasn't changed make * sure that a collecting distributing * port in an active aggregator is enabled */ if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) { __enable_port(port); } } break; default: break; } } /* check if the state machine was changed */ if (port->sm_mux_state != last_state) { pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n", port->actor_port_number, port->slave->dev->name, last_state, port->sm_mux_state); switch (port->sm_mux_state) { case AD_MUX_DETACHED: port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION; ad_disable_collecting_distributing(port, update_slave_arr); 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: if (port->aggregator->is_active) port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION; else 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, update_slave_arr); port->ntt = true; /* Send a notificaton about change in state of this * port. We only want to handle case where port moves * from AD_MUX_COLLECTING_DISTRIBUTING -> * AD_MUX_ATTACHED. */ if (bond_slave_is_up(port->slave) && (last_state == AD_MUX_COLLECTING_DISTRIBUTING)) { struct bond_cb *lag_cb_main; rcu_read_lock(); lag_cb_main = rcu_dereference(bond_cb); if (lag_cb_main && lag_cb_main->bond_cb_link_down) { struct net_device *dev; dev = port->slave->dev; lag_cb_main->bond_cb_link_down(dev); } rcu_read_unlock(); } break; case AD_MUX_COLLECTING_DISTRIBUTING: port->actor_oper_port_state |= AD_STATE_COLLECTING; port->actor_oper_port_state |= AD_STATE_DISTRIBUTING; port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION; ad_enable_collecting_distributing(port, update_slave_arr); port->ntt = true; break; default: break; } } } /** * ad_rx_machine - handle a port's rx State Machine * @lacpdu: the lacpdu we've received * @port: the port we're looking at * * If lacpdu arrived, stop previous timer (if exists) and set the next state as * CURRENT. If timer expired set the state machine in the proper state. * In other cases, this function checks if we need to switch to other state. */ static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port) { rx_states_t last_state; /* keep current State Machine state to compare later if it was * changed */ last_state = port->sm_rx_state; /* check if state machine should change state */ /* first, check if port was reinitialized */ if (port->sm_vars & AD_PORT_BEGIN) { port->sm_rx_state = AD_RX_INITIALIZE; port->sm_vars |= AD_PORT_CHURNED; /* check if port is not enabled */ } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) port->sm_rx_state = AD_RX_PORT_DISABLED; /* check if new lacpdu arrived */ else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) { if (port->sm_rx_state != AD_RX_CURRENT) port->sm_vars |= AD_PORT_CHURNED; port->sm_rx_timer_counter = 0; port->sm_rx_state = AD_RX_CURRENT; } else { /* if timer is on, and if it is expired */ if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) { switch (port->sm_rx_state) { case AD_RX_EXPIRED: port->sm_rx_state = AD_RX_DEFAULTED; break; case AD_RX_CURRENT: port->sm_rx_state = AD_RX_EXPIRED; break; default: break; } } else { /* if no lacpdu arrived and no timer is on */ switch (port->sm_rx_state) { case AD_RX_PORT_DISABLED: if (port->sm_vars & AD_PORT_MOVED) port->sm_rx_state = AD_RX_INITIALIZE; else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) port->sm_rx_state = AD_RX_EXPIRED; else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) port->sm_rx_state = AD_RX_LACP_DISABLED; break; default: break; } } } /* check if the State machine was changed or new lacpdu arrived */ if ((port->sm_rx_state != last_state) || (lacpdu)) { pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n", port->actor_port_number, port->slave->dev->name, last_state, port->sm_rx_state); switch (port->sm_rx_state) { case AD_RX_INITIALIZE: if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)) port->sm_vars &= ~AD_PORT_LACP_ENABLED; else port->sm_vars |= AD_PORT_LACP_ENABLED; port->sm_vars &= ~AD_PORT_SELECTED; __record_default(port); port->actor_oper_port_state &= ~AD_STATE_EXPIRED; port->sm_vars &= ~AD_PORT_MOVED; port->sm_rx_state = AD_RX_PORT_DISABLED; /* Fall Through */ case AD_RX_PORT_DISABLED: port->sm_vars &= ~AD_PORT_MATCHED; break; case AD_RX_LACP_DISABLED: port->sm_vars &= ~AD_PORT_SELECTED; __record_default(port); port->partner_oper.port_state &= ~AD_STATE_AGGREGATION; port->sm_vars |= AD_PORT_MATCHED; port->actor_oper_port_state &= ~AD_STATE_EXPIRED; break; case AD_RX_EXPIRED: /* Reset of the Synchronization flag (Standard 43.4.12) * This reset cause to disable this port in the * COLLECTING_DISTRIBUTING state of the mux machine in * case of EXPIRED even if LINK_DOWN didn't arrive for * the port. */ port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION; port->sm_vars &= ~AD_PORT_MATCHED; port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT; 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; port->sm_vars |= AD_PORT_CHURNED; break; case AD_RX_DEFAULTED: __update_default_selected(port); __record_default(port); port->sm_vars |= AD_PORT_MATCHED; port->actor_oper_port_state &= ~AD_STATE_EXPIRED; break; case AD_RX_CURRENT: /* detect loopback situation */ if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), &(port->actor_system))) { netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n" "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n", port->slave->dev->name); return; } __update_selected(lacpdu, port); __update_ntt(lacpdu, port); __record_pdu(lacpdu, port); port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)); port->actor_oper_port_state &= ~AD_STATE_EXPIRED; break; default: break; } } } /** * ad_churn_machine - handle port churn's state machine * @port: the port we're looking at * */ static void ad_churn_machine(struct port *port) { if (port->sm_vars & AD_PORT_CHURNED) { port->sm_vars &= ~AD_PORT_CHURNED; port->sm_churn_actor_state = AD_CHURN_MONITOR; port->sm_churn_partner_state = AD_CHURN_MONITOR; port->sm_churn_actor_timer_counter = __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0); port->sm_churn_partner_timer_counter = __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0); return; } if (port->sm_churn_actor_timer_counter && !(--port->sm_churn_actor_timer_counter) && port->sm_churn_actor_state == AD_CHURN_MONITOR) { if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) { port->sm_churn_actor_state = AD_NO_CHURN; } else { port->churn_actor_count++; port->sm_churn_actor_state = AD_CHURN; } } if (port->sm_churn_partner_timer_counter && !(--port->sm_churn_partner_timer_counter) && port->sm_churn_partner_state == AD_CHURN_MONITOR) { if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) { port->sm_churn_partner_state = AD_NO_CHURN; } else { port->churn_partner_count++; port->sm_churn_partner_state = AD_CHURN; } } } /** * ad_tx_machine - handle a port's tx state machine * @port: the port we're looking at */ static void ad_tx_machine(struct port *port) { /* check if tx timer expired, to verify that we do not send more than * 3 packets per second */ if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) { /* check if there is something to send */ if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) { __update_lacpdu_from_port(port); if (ad_lacpdu_send(port) >= 0) { pr_debug("Sent LACPDU on port %d\n", port->actor_port_number); /* mark ntt as false, so it will not be sent * again until demanded */ port->ntt = false; } } /* restart tx timer(to verify that we will not exceed * AD_MAX_TX_IN_SECOND */ port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; } } /** * ad_periodic_machine - handle a port's periodic state machine * @port: the port we're looking at * * Turn ntt flag on priodically to perform periodic transmission of lacpdu's. */ static void ad_periodic_machine(struct port *port) { periodic_states_t last_state; /* keep current state machine state to compare later if it was changed */ last_state = port->sm_periodic_state; /* check if port was reinitialized */ if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) || (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY)) ) { port->sm_periodic_state = AD_NO_PERIODIC; } /* check if state machine should change state */ else if (port->sm_periodic_timer_counter) { /* check if periodic state machine expired */ if (!(--port->sm_periodic_timer_counter)) { /* if expired then do tx */ port->sm_periodic_state = AD_PERIODIC_TX; } else { /* If not expired, check if there is some new timeout * parameter from the partner state */ switch (port->sm_periodic_state) { case AD_FAST_PERIODIC: if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) port->sm_periodic_state = AD_SLOW_PERIODIC; break; case AD_SLOW_PERIODIC: if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) { port->sm_periodic_timer_counter = 0; port->sm_periodic_state = AD_PERIODIC_TX; } break; default: break; } } } else { switch (port->sm_periodic_state) { case AD_NO_PERIODIC: port->sm_periodic_state = AD_FAST_PERIODIC; break; case AD_PERIODIC_TX: if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) port->sm_periodic_state = AD_SLOW_PERIODIC; else port->sm_periodic_state = AD_FAST_PERIODIC; break; default: break; } } /* check if the state machine was changed */ if (port->sm_periodic_state != last_state) { pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state); switch (port->sm_periodic_state) { case AD_NO_PERIODIC: port->sm_periodic_timer_counter = 0; break; case AD_FAST_PERIODIC: /* decrement 1 tick we lost in the PERIODIC_TX cycle */ port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; break; case AD_SLOW_PERIODIC: /* decrement 1 tick we lost in the PERIODIC_TX cycle */ port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; break; case AD_PERIODIC_TX: port->ntt = true; break; default: break; } } } /** * ad_port_selection_logic - select aggregation groups * @port: the port we're looking at * @update_slave_arr: Does slave array need update? * * 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, bool *update_slave_arr) { struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator; struct port *last_port = NULL, *curr_port; struct list_head *iter; struct bonding *bond; struct slave *slave; int found = 0; /* if the port is already Selected, do nothing */ if (port->sm_vars & AD_PORT_SELECTED) return; bond = __get_bond_by_port(port); /* if the port is connected to other aggregator, detach it */ if (port->aggregator) { /* detach the port from its former aggregator */ temp_aggregator = port->aggregator; for (curr_port = temp_aggregator->lag_ports; curr_port; last_port = curr_port, curr_port = curr_port->next_port_in_aggregator) { if (curr_port == port) { temp_aggregator->num_of_ports--; /* if it is the first port attached to the * aggregator */ if (!last_port) { temp_aggregator->lag_ports = port->next_port_in_aggregator; } else { /* not the first port attached to the * aggregator */ last_port->next_port_in_aggregator = port->next_port_in_aggregator; } /* clear the port's relations to this * aggregator */ port->aggregator = NULL; port->next_port_in_aggregator = NULL; port->actor_port_aggregator_identifier = 0; netdev_dbg(bond->dev, "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 */ net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n", port->slave->bond->dev->name, port->actor_port_number, port->slave->dev->name, port->aggregator->aggregator_identifier); } } /* search on all aggregators for a suitable aggregator for this port */ bond_for_each_slave(bond, slave, iter) { aggregator = &(SLAVE_AD_INFO(slave)->aggregator); /* keep a free aggregator for later use(if needed) */ if (!aggregator->lag_ports) { if (!free_aggregator) free_aggregator = aggregator; continue; } /* check if current aggregator suits us */ if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */ MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) && (aggregator->partner_system_priority == port->partner_oper.system_priority) && (aggregator->partner_oper_aggregator_key == port->partner_oper.key) ) && ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */ !aggregator->is_individual) /* but is not individual OR */ ) ) { /* attach to the founded aggregator */ port->aggregator = aggregator; port->actor_port_aggregator_identifier = port->aggregator->aggregator_identifier; port->next_port_in_aggregator = aggregator->lag_ports; port->aggregator->num_of_ports++; aggregator->lag_ports = port; netdev_dbg(bond->dev, "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_MASKS) /* 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; netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier); } else { netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n", 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, update_slave_arr); if (!port->aggregator->is_active) port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION; } /* 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: net_warn_ratelimited("%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 * @update_slave_arr: Does slave array need update? * * 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, bool *update_slave_arr) { struct aggregator *best, *active, *origin; struct bonding *bond = agg->slave->bond; struct list_head *iter; struct slave *slave; struct port *port; rcu_read_lock(); origin = agg; active = __get_active_agg(agg); best = (active && agg_device_up(active)) ? active : NULL; bond_for_each_slave_rcu(bond, slave, iter) { agg = &(SLAVE_AD_INFO(slave)->aggregator); agg->is_active = 0; if (agg->num_of_ports && agg_device_up(agg)) best = ad_agg_selection_test(best, agg); } if (best && __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) { /* For the STABLE policy, don't replace the old active * aggregator if it's still active (it has an answering * partner) or if both the best and active don't have an * answering partner. */ if (active && active->lag_ports && active->lag_ports->is_enabled && (__agg_has_partner(active) || (!__agg_has_partner(active) && !__agg_has_partner(best)))) { if (!(!active->actor_oper_aggregator_key && best->actor_oper_aggregator_key)) { best = NULL; active->is_active = 1; } } } if (best && (best == active)) { best = NULL; active->is_active = 1; } /* if there is new best aggregator, activate it */ if (best) { netdev_dbg(bond->dev, "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); netdev_dbg(bond->dev, "best ports %p slave %p %s\n", best->lag_ports, best->slave, best->slave ? best->slave->dev->name : "NULL"); bond_for_each_slave_rcu(bond, slave, iter) { agg = &(SLAVE_AD_INFO(slave)->aggregator); netdev_dbg(bond->dev, "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) { net_warn_ratelimited("%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; netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n", best->aggregator_identifier); netdev_dbg(bond->dev, "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); } } /* Slave array needs update. */ *update_slave_arr = true; } /* if the selected aggregator is of join individuals * (partner_system is NULL), enable their ports */ active = __get_active_agg(origin); if (active) { if (!__agg_has_partner(active)) { for (port = active->lag_ports; port; port = port->next_port_in_aggregator) { __enable_port(port); } } } rcu_read_unlock(); bond_3ad_set_carrier(bond); } /** * ad_clear_agg - clear a given aggregator's parameters * @aggregator: the aggregator we're looking at */ static void ad_clear_agg(struct aggregator *aggregator) { if (aggregator) { aggregator->is_individual = false; aggregator->actor_admin_aggregator_key = 0; aggregator->actor_oper_aggregator_key = 0; aggregator->partner_system = null_mac_addr; aggregator->partner_system_priority = 0; aggregator->partner_oper_aggregator_key = 0; aggregator->receive_state = 0; aggregator->transmit_state = 0; aggregator->lag_ports = NULL; aggregator->is_active = 0; aggregator->num_of_ports = 0; pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier); } } /** * ad_initialize_agg - initialize a given aggregator's parameters * @aggregator: the aggregator we're looking at */ static void ad_initialize_agg(struct aggregator *aggregator) { if (aggregator) { ad_clear_agg(aggregator); aggregator->aggregator_mac_address = null_mac_addr; aggregator->aggregator_identifier = 0; aggregator->slave = NULL; } } /** * ad_initialize_port - initialize a given port's parameters * @aggregator: the aggregator we're looking at * @lacp_fast: boolean. whether fast periodic should be used */ static void ad_initialize_port(struct port *port, int lacp_fast) { static const struct port_params tmpl = { .system_priority = 0xffff, .key = 1, .port_number = 1, .port_priority = 0xff, .port_state = 1, }; static const struct lacpdu lacpdu = { .subtype = 0x01, .version_number = 0x01, .tlv_type_actor_info = 0x01, .actor_information_length = 0x14, .tlv_type_partner_info = 0x02, .partner_information_length = 0x14, .tlv_type_collector_info = 0x03, .collector_information_length = 0x10, .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY), }; if (port) { port->actor_port_priority = 0xff; port->actor_port_aggregator_identifier = 0; port->ntt = false; 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 = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED; 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->aggregator = NULL; port->next_port_in_aggregator = NULL; port->transaction_id = 0; port->sm_churn_actor_timer_counter = 0; port->sm_churn_actor_state = 0; port->churn_actor_count = 0; port->sm_churn_partner_timer_counter = 0; port->sm_churn_partner_state = 0; port->churn_partner_count = 0; memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu)); } } /** * ad_enable_collecting_distributing - enable a port's transmit/receive * @port: the port we're looking at * @update_slave_arr: Does slave array need update? * * Enable @port if it's in an active aggregator */ static void ad_enable_collecting_distributing(struct port *port, bool *update_slave_arr) { if (port->aggregator->is_active) { struct bond_cb *lag_cb_main; pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier); __enable_port(port); /* Slave array needs update */ *update_slave_arr = true; rcu_read_lock(); lag_cb_main = rcu_dereference(bond_cb); if (lag_cb_main && lag_cb_main->bond_cb_link_up) lag_cb_main->bond_cb_link_up(port->slave->dev); rcu_read_unlock(); } } /** * ad_disable_collecting_distributing - disable a port's transmit/receive * @port: the port we're looking at * @update_slave_arr: Does slave array need update? */ static void ad_disable_collecting_distributing(struct port *port, bool *update_slave_arr) { if (port->aggregator && !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system), &(null_mac_addr))) { pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier); __disable_port(port); /* Slave array needs an update */ *update_slave_arr = true; } } /** * ad_marker_info_received - handle receive of a Marker information frame * @marker_info: Marker info received * @port: the port we're looking at */ static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port) { struct bond_marker marker; /* copy the received marker data to the response marker */ memcpy(&marker, marker_info, sizeof(struct bond_marker)); /* change the marker subtype to marker response */ marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE; /* send the marker response */ if (ad_marker_send(port, &marker) >= 0) { pr_debug("Sent Marker Response on port %d\n", port->actor_port_number); } } /** * ad_marker_response_received - handle receive of a marker response frame * @marker: marker PDU received * @port: the port we're looking at * * This function does nothing since we decided not to implement send and handle * response for marker PDU's, in this stage, but only to respond to marker * information. */ static void ad_marker_response_received(struct bond_marker *marker, struct port *port) { /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */ } /* ========= AD exported functions to the main bonding code ========= */ /* Check aggregators status in team every T seconds */ #define AD_AGGREGATOR_SELECTION_TIMER 8 /** * bond_3ad_initiate_agg_selection - initate aggregator selection * @bond: bonding struct * * Set the aggregation selection timer, to initiate an agg selection in * the very near future. Called during first initialization, and during * any down to up transitions of the bond. */ void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout) { BOND_AD_INFO(bond).agg_select_timer = timeout; } /** * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures * @bond: bonding struct to work on * @tick_resolution: tick duration (millisecond resolution) * * Can be called only after the mac address of the bond is set. */ void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution) { /* check that the bond is not initialized yet */ if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr), bond->dev->dev_addr)) { BOND_AD_INFO(bond).aggregator_identifier = 0; BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio; if (is_zero_ether_addr(bond->params.ad_actor_system)) BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr); else BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->params.ad_actor_system); /* initialize how many times this module is called in one * second (should be about every 100ms) */ ad_ticks_per_sec = tick_resolution; bond_3ad_initiate_agg_selection(bond, AD_AGGREGATOR_SELECTION_TIMER * ad_ticks_per_sec); } } /** * bond_3ad_bind_slave - initialize a slave's port * @slave: slave struct to work on * * Returns: 0 on success * < 0 on error */ void bond_3ad_bind_slave(struct slave *slave) { struct bonding *bond = bond_get_bond_by_slave(slave); struct port *port; struct aggregator *aggregator; /* check that the slave has not been initialized yet. */ if (SLAVE_AD_INFO(slave)->port.slave != slave) { /* port initialization */ port = &(SLAVE_AD_INFO(slave)->port); ad_initialize_port(port, bond->params.lacp_fast); port->slave = slave; port->actor_port_number = SLAVE_AD_INFO(slave)->id; /* key is determined according to the link speed, duplex and * user key */ port->actor_admin_port_key = bond->params.ad_user_port_key << 6; ad_update_actor_keys(port, false); /* actor system is the bond's system */ port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr; port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority; /* 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; __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 = ++BOND_AD_INFO(bond).aggregator_identifier; aggregator->slave = slave; aggregator->is_active = 0; aggregator->num_of_ports = 0; } } /** * bond_3ad_unbind_slave - deinitialize a slave's port * @slave: slave struct to work on * * Search for the aggregator that is related to this port, remove the * aggregator and assign another aggregator for other port related to it * (if any), and remove the port. */ void bond_3ad_unbind_slave(struct slave *slave) { struct port *port, *prev_port, *temp_port; struct aggregator *aggregator, *new_aggregator, *temp_aggregator; int select_new_active_agg = 0; struct bonding *bond = slave->bond; struct slave *slave_iter; struct list_head *iter; bool dummy_slave_update; /* Ignore this value as caller updates array */ /* Sync against bond_3ad_state_machine_handler() */ spin_lock_bh(&bond->mode_lock); aggregator = &(SLAVE_AD_INFO(slave)->aggregator); port = &(SLAVE_AD_INFO(slave)->port); /* if slave is null, the whole port is not initialized */ if (!port->slave) { netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n", slave->dev->name); goto out; } netdev_dbg(bond->dev, "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))) { netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier); if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) { netdev_info(bond->dev, "Removing an active aggregator\n"); select_new_active_agg = 1; } new_aggregator->is_individual = aggregator->is_individual; new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key; new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key; new_aggregator->partner_system = aggregator->partner_system; new_aggregator->partner_system_priority = aggregator->partner_system_priority; new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key; new_aggregator->receive_state = aggregator->receive_state; new_aggregator->transmit_state = aggregator->transmit_state; new_aggregator->lag_ports = aggregator->lag_ports; new_aggregator->is_active = aggregator->is_active; new_aggregator->num_of_ports = aggregator->num_of_ports; /* update the information that is written on * the ports about the aggregator */ for (temp_port = aggregator->lag_ports; temp_port; temp_port = temp_port->next_port_in_aggregator) { temp_port->aggregator = new_aggregator; temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier; } ad_clear_agg(aggregator); if (select_new_active_agg) ad_agg_selection_logic(__get_first_agg(port), &dummy_slave_update); } else { netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n"); } } else { /* in case that the only port related to this * aggregator is the one we want to remove */ select_new_active_agg = aggregator->is_active; ad_clear_agg(aggregator); if (select_new_active_agg) { netdev_info(bond->dev, "Removing an active aggregator\n"); /* select new active aggregator */ temp_aggregator = __get_first_agg(port); if (temp_aggregator) ad_agg_selection_logic(temp_aggregator, &dummy_slave_update); } } } netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number); /* find the aggregator that this port is connected to */ bond_for_each_slave(bond, slave_iter, iter) { temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); prev_port = NULL; /* search the port in the aggregator's related ports */ for (temp_port = temp_aggregator->lag_ports; temp_port; prev_port = temp_port, temp_port = temp_port->next_port_in_aggregator) { if (temp_port == port) { /* the aggregator found - detach the port from * this aggregator */ if (prev_port) prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator; else temp_aggregator->lag_ports = temp_port->next_port_in_aggregator; temp_aggregator->num_of_ports--; if (temp_aggregator->num_of_ports == 0) { select_new_active_agg = temp_aggregator->is_active; ad_clear_agg(temp_aggregator); if (select_new_active_agg) { netdev_info(bond->dev, "Removing an active aggregator\n"); /* select new active aggregator */ ad_agg_selection_logic(__get_first_agg(port), &dummy_slave_update); } } break; } } } port->slave = NULL; out: spin_unlock_bh(&bond->mode_lock); } /** * 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; bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; bool update_slave_arr = false; /* Lock to protect data accessed by all (e.g., port->sm_vars) and * against running with bond_3ad_unbind_slave. ad_rx_machine may run * concurrently due to incoming LACPDU as well. */ spin_lock_bh(&bond->mode_lock); rcu_read_lock(); /* check if there are any slaves */ if (!bond_has_slaves(bond)) goto re_arm; /* check if agg_select_timer timer after initialize is timed out */ if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) { slave = bond_first_slave_rcu(bond); port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL; /* select the active aggregator for the bond */ if (port) { if (!port->slave) { net_warn_ratelimited("%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, &update_slave_arr); } bond_3ad_set_carrier(bond); } /* for each port run the state machines */ bond_for_each_slave_rcu(bond, slave, iter) { port = &(SLAVE_AD_INFO(slave)->port); if (!port->slave) { net_warn_ratelimited("%s: Warning: Found an uninitialized port\n", bond->dev->name); goto re_arm; } ad_rx_machine(NULL, port); ad_periodic_machine(port); ad_port_selection_logic(port, &update_slave_arr); ad_mux_machine(port, &update_slave_arr); ad_tx_machine(port); ad_churn_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: bond_for_each_slave_rcu(bond, slave, iter) { if (slave->should_notify) { should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; break; } } rcu_read_unlock(); spin_unlock_bh(&bond->mode_lock); if (update_slave_arr) bond_slave_arr_work_rearm(bond, 0); if (should_notify_rtnl && rtnl_trylock()) { bond_slave_state_notify(bond); rtnl_unlock(); } queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); } /** * bond_3ad_rx_indication - handle a received frame * @lacpdu: received lacpdu * @slave: slave struct to work on * @length: length of the data received * * It is assumed that frames that were sent on this NIC don't returned as new * received frames (loopback). Since only the payload is given to this * function, it check for loopback. */ static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length) { struct port *port; int ret = RX_HANDLER_ANOTHER; if (length >= sizeof(struct lacpdu)) { port = &(SLAVE_AD_INFO(slave)->port); if (!port->slave) { net_warn_ratelimited("%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; netdev_dbg(slave->bond->dev, "Received LACPDU on port %d slave %s\n", port->actor_port_number, slave->dev->name); /* Protect against concurrent state machines */ spin_lock(&slave->bond->mode_lock); ad_rx_machine(lacpdu, port); spin_unlock(&slave->bond->mode_lock); 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: netdev_dbg(slave->bond->dev, "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: netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n", port->actor_port_number); ad_marker_response_received((struct bond_marker *)lacpdu, port); break; default: netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n", port->actor_port_number); } } } return ret; } /** * ad_update_actor_keys - Update the oper / admin keys for a port based on * its current speed and duplex settings. * * @port: the port we'are looking at * @reset: Boolean to just reset the speed and the duplex part of the key * * The logic to change the oper / admin keys is: * (a) A full duplex port can participate in LACP with partner. * (b) When the speed is changed, LACP need to be reinitiated. */ static void ad_update_actor_keys(struct port *port, bool reset) { u8 duplex = 0; u16 ospeed = 0, speed = 0; u16 old_oper_key = port->actor_oper_port_key; port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS); if (!reset) { speed = __get_link_speed(port); ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1; duplex = __get_duplex(port); port->actor_admin_port_key |= (speed << 1) | duplex; } port->actor_oper_port_key = port->actor_admin_port_key; if (old_oper_key != port->actor_oper_port_key) { /* Only 'duplex' port participates in LACP */ if (duplex) port->sm_vars |= AD_PORT_LACP_ENABLED; else port->sm_vars &= ~AD_PORT_LACP_ENABLED; if (!reset) { if (!speed) { netdev_err(port->slave->dev, "speed changed to 0 for port %s", port->slave->dev->name); } else if (duplex && ospeed != speed) { /* Speed change restarts LACP state-machine */ port->sm_vars |= AD_PORT_BEGIN; } } } } /** * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex * change indication * * @slave: slave struct to work on * * Handle reselection of aggregator (if needed) for this port. */ void bond_3ad_adapter_speed_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) { netdev_warn(slave->bond->dev, "speed/duplex changed for uninitialized port %s\n", slave->dev->name); return; } spin_lock_bh(&slave->bond->mode_lock); ad_update_actor_keys(port, false); netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n", port->actor_port_number, slave->dev->name); spin_unlock_bh(&slave->bond->mode_lock); } /** * 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) { netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n", slave->dev->name); return; } spin_lock_bh(&slave->bond->mode_lock); /* 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; ad_update_actor_keys(port, false); } else { /* link has failed */ port->is_enabled = false; ad_update_actor_keys(port, true); } netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n", port->actor_port_number, link == BOND_LINK_UP ? "UP" : "DOWN"); spin_unlock_bh(&slave->bond->mode_lock); /* RTNL is held and mode_lock is released so it's safe * to update slave_array here. */ bond_update_slave_arr(slave->bond, NULL); } /** * bond_3ad_set_carrier - set link state for bonding master * @bond - bonding structure * * if we have an active aggregator, we're up, if not, we're down. * Presumes that we cannot have an active aggregator if there are * no slaves with link up. * * This behavior complies with IEEE 802.3 section 43.3.9. * * Called by bond_set_carrier(). Return zero if carrier state does not * change, nonzero if it does. */ int bond_3ad_set_carrier(struct bonding *bond) { struct aggregator *active; struct slave *first_slave; int ret = 1; rcu_read_lock(); first_slave = bond_first_slave_rcu(bond); if (!first_slave) { ret = 0; goto out; } active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator)); if (active) { /* are enough slaves available to consider link up? */ if (active->num_of_ports < bond->params.min_links) { if (netif_carrier_ok(bond->dev)) { netif_carrier_off(bond->dev); goto out; } } else if (!netif_carrier_ok(bond->dev)) { netif_carrier_on(bond->dev); goto out; } } else if (netif_carrier_ok(bond->dev)) { netif_carrier_off(bond->dev); } out: rcu_read_unlock(); return ret; } /** * __bond_3ad_get_active_agg_info - get information of the active aggregator * @bond: bonding struct to work on * @ad_info: ad_info struct to fill with the bond's info * * Returns: 0 on success * < 0 on error */ int __bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info) { struct aggregator *aggregator = NULL; struct list_head *iter; struct slave *slave; struct port *port; bond_for_each_slave_rcu(bond, slave, iter) { port = &(SLAVE_AD_INFO(slave)->port); if (port->aggregator && port->aggregator->is_active) { aggregator = port->aggregator; break; } } if (!aggregator) return -1; 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; ether_addr_copy(ad_info->partner_system, aggregator->partner_system.mac_addr_value); return 0; } 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; } /* bond_3ad_get_tx_dev - Calculate egress interface for a given packet, * for a LAG that is configured in 802.3AD mode * @skb: pointer to skb to be egressed * @src_mac: pointer to source L2 address * @dst_mac: pointer to destination L2 address * @src: pointer to source L3 address * @dst: pointer to destination L3 address * @protocol: L3 protocol id from L2 header * @bond_dev: pointer to bond master device * * If @skb is NULL, bond_xmit_hash is used to calculate hash using L2/L3 * addresses. * * Returns: Either valid slave device, or NULL otherwise */ struct net_device *bond_3ad_get_tx_dev(struct sk_buff *skb, u8 *src_mac, u8 *dst_mac, void *src, void *dst, u16 protocol, struct net_device *bond_dev, __be16 *layer4hdr) { struct bonding *bond = netdev_priv(bond_dev); struct aggregator *agg; struct ad_info ad_info; struct list_head *iter; struct slave *slave; struct slave *first_ok_slave = NULL; u32 hash = 0; int slaves_in_agg; int slave_agg_no = 0; 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", bond_dev->name); return NULL; } 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", bond_dev->name); return NULL; } if (skb) { hash = bond_xmit_hash(bond, skb); slave_agg_no = hash % slaves_in_agg; } else { if (bond->params.xmit_policy != BOND_XMIT_POLICY_LAYER23 && bond->params.xmit_policy != BOND_XMIT_POLICY_LAYER2 && bond->params.xmit_policy != BOND_XMIT_POLICY_LAYER34) { pr_debug("%s: Error: Unsupported hash policy for 802.3AD fast path\n", bond_dev->name); return NULL; } hash = bond_xmit_hash_without_skb(src_mac, dst_mac, src, dst, protocol, bond_dev, layer4hdr); slave_agg_no = hash % slaves_in_agg; } 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 && bond_slave_can_tx(slave)) first_ok_slave = slave; slave_agg_no--; continue; } if (bond_slave_can_tx(slave)) return slave->dev; } if (slave_agg_no >= 0) { pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n", bond_dev->name, agg_id); return NULL; } /* we couldn't find any suitable slave after the agg_no, so use the * first suitable found, if found. */ if (first_ok_slave) return first_ok_slave->dev; return NULL; } int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave) { struct lacpdu *lacpdu, _lacpdu; if (skb->protocol != PKT_TYPE_LACPDU) return RX_HANDLER_ANOTHER; if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr)) return RX_HANDLER_ANOTHER; lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu); if (!lacpdu) return RX_HANDLER_ANOTHER; return bond_3ad_rx_indication(lacpdu, slave, skb->len); } /** * bond_3ad_update_lacp_rate - change the lacp rate * @bond - bonding struct * * When modify lacp_rate parameter via sysfs, * update actor_oper_port_state of each port. * * Hold bond->mode_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; spin_lock_bh(&bond->mode_lock); bond_for_each_slave(bond, slave, iter) { port = &(SLAVE_AD_INFO(slave)->port); if (lacp_fast) port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT; else port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT; } spin_unlock_bh(&bond->mode_lock); }