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Date: Wed, 18 Feb 2015 13:41:07 +0100
From: Nikolay Aleksandrov <nikolay@...hat.com>
To: Mahesh Bandewar <maheshb@...gle.com>,
Jay Vosburgh <j.vosburgh@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
Veaceslav Falico <vfalico@...il.com>,
David Miller <davem@...emloft.net>
CC: Maciej Zenczykowski <maze@...gle.com>,
netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH next v4 3/6] bonding: Implement port churn-machine (AD
standard 43.4.17).
On 02/18/2015 08:17 AM, Mahesh Bandewar wrote:
> The Churn Detection machines detect the situation where a port is operable,
> but the Actor and Partner have not attached the link to an Aggregator and
> brought the link into operation within a bound time period. Under normal
> operation of the LACP, agreement between Actor and Partner should be reached
> very rapidly. Continued failure to reach agreement can be symptomatic of
> device failure.
>
> Actor-churn-detection state-machine
> ===================================
>
> BEGIN=True + PortEnable=False
> |
> v
> +------------------------+ ActorPort.Sync=True +------------------+
> | ACTOR_CHURN_MONITOR | ---------------------> | NO_ACTOR_CHURN |
> |========================| |==================|
> | ActorChurn=False | ActorPort.Sync=False | ActorChurn=False |
> | ActorChurn.Timer=Start | <--------------------- | |
> +------------------------+ +------------------+
> | ^
> | |
> ActorChurn.Timer=Expired |
> | ActorPort.Sync=True
> | |
> | +-----------------+ |
> | | ACTOR_CHURN | |
> | |=================| |
> +--------------> | ActorChurn=True | ------------+
> | |
> +-----------------+
>
> Similar for the Partner-churn-detection.
>
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> ---
> v1:
> Initial version
> v2-v4:
> Rebase
>
> drivers/net/bonding/bond_3ad.c | 56 +++++++++++++++++++++++++++++++++++++--
> drivers/net/bonding/bond_procfs.c | 40 +++++++++++++++++++++++++---
> include/net/bond_3ad.h | 29 ++++++++++++++++++++
> 3 files changed, 119 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
> index 9b436696b95e..c728ece78154 100644
> --- a/drivers/net/bonding/bond_3ad.c
> +++ b/drivers/net/bonding/bond_3ad.c
> @@ -38,6 +38,7 @@
> #define AD_STANDBY 0x2
> #define AD_MAX_TX_IN_SECOND 3
> #define AD_COLLECTOR_MAX_DELAY 0
> +#define AD_MONITOR_CHURNED 0x1000
>
> /* Timer definitions (43.4.4 in the 802.3ad standard) */
> #define AD_FAST_PERIODIC_TIME 1
> @@ -1013,16 +1014,19 @@ static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
> /* check if state machine should change state */
>
> /* first, check if port was reinitialized */
> - if (port->sm_vars & AD_PORT_BEGIN)
> + if (port->sm_vars & AD_PORT_BEGIN) {
> port->sm_rx_state = AD_RX_INITIALIZE;
> + port->sm_vars |= AD_MONITOR_CHURNED;
> /* check if port is not enabled */
> - else if (!(port->sm_vars & AD_PORT_BEGIN)
> + } 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_MONITOR_CHURNED;
> port->sm_rx_timer_counter = 0;
> port->sm_rx_state = AD_RX_CURRENT;
> } else {
> @@ -1100,9 +1104,11 @@ static void ad_rx_machine(struct lacpdu *lacpdu, struct port *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_MONITOR_CHURNED;
> break;
> case AD_RX_DEFAULTED:
> __update_default_selected(port);
> @@ -1131,6 +1137,44 @@ static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
> }
> }
>
> +/* 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_MONITOR_CHURNED) {
> + port->sm_vars &= ~AD_MONITOR_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)) {
^^^^^^^
These are too indented, also you can drop the () around:
(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)) {
^^^^^^^
Same here.
> + 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
> @@ -1745,6 +1789,13 @@ static void ad_initialize_port(struct port *port, int lacp_fast)
> 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));
> }
> }
> @@ -2164,6 +2215,7 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
> 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)
> diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c
> index 976f5ad2a0f2..83095a0b4b90 100644
> --- a/drivers/net/bonding/bond_procfs.c
> +++ b/drivers/net/bonding/bond_procfs.c
> @@ -178,13 +178,45 @@ static void bond_info_show_slave(struct seq_file *seq,
> seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
>
> if (BOND_MODE(bond) == BOND_MODE_8023AD) {
> - const struct aggregator *agg
> - = SLAVE_AD_INFO(slave)->port.aggregator;
> + const struct port *port = &SLAVE_AD_INFO(slave)->port;
> + const struct aggregator *agg = port->aggregator;
>
> - if (agg)
> + if (agg) {
> seq_printf(seq, "Aggregator ID: %d\n",
> agg->aggregator_identifier);
> - else
> + seq_printf(seq, "Actor Churn State: %s\n",
> + bond_3ad_churn_desc(port->sm_churn_actor_state));
> + seq_printf(seq, "Partner Churn State: %s\n",
> + bond_3ad_churn_desc(port->sm_churn_partner_state));
> + seq_printf(seq, "Actor Churned Count: %d\n",
> + port->churn_actor_count);
> + seq_printf(seq, "Partner Churned Count: %d\n",
> + port->churn_partner_count);
> +
> + seq_puts(seq, "details actor lacp pdu:\n");
> + seq_printf(seq, " system priority: %d\n",
> + port->actor_system_priority);
> + seq_printf(seq, " port key: %d\n",
> + port->actor_oper_port_key);
> + seq_printf(seq, " port priority: %d\n",
> + port->actor_port_priority);
> + seq_printf(seq, " port number: %d\n",
> + port->actor_port_number);
> + seq_printf(seq, " port state: %d\n",
> + port->actor_oper_port_state);
> +
> + seq_puts(seq, "details partner lacp pdu:\n");
> + seq_printf(seq, " system priority: %d\n",
> + port->partner_oper.system_priority);
> + seq_printf(seq, " oper key: %d\n",
> + port->partner_oper.key);
> + seq_printf(seq, " port priority: %d\n",
> + port->partner_oper.port_priority);
> + seq_printf(seq, " port number: %d\n",
> + port->partner_oper.port_number);
> + seq_printf(seq, " port state: %d\n",
> + port->partner_oper.port_state);
> + } else
> seq_puts(seq, "Aggregator ID: N/A\n");
^^^^^^^^^^^^^^^^^^^^
"else" part should also have curly braces.
> }
> seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
> diff --git a/include/net/bond_3ad.h b/include/net/bond_3ad.h
> index f04cdbb7848e..22ac75dd8bd5 100644
> --- a/include/net/bond_3ad.h
> +++ b/include/net/bond_3ad.h
> @@ -82,6 +82,13 @@ typedef enum {
> AD_TRANSMIT /* tx Machine */
> } tx_states_t;
>
> +/* churn machine states(43.4.17 in the 802.3ad standard) */
> +typedef enum {
> + AD_CHURN_MONITOR, /* monitoring for churn */
> + AD_CHURN, /* churn detected (error) */
> + AD_NO_CHURN /* no churn (no error) */
> +} churn_state_t;
> +
> /* rx indication types */
> typedef enum {
> AD_TYPE_LACPDU = 1, /* type lacpdu */
> @@ -229,6 +236,12 @@ typedef struct port {
> u16 sm_mux_timer_counter; /* state machine mux timer counter */
> tx_states_t sm_tx_state; /* state machine tx state */
> u16 sm_tx_timer_counter; /* state machine tx timer counter(allways on - enter to transmit state 3 time per second) */
> + u16 sm_churn_actor_timer_counter;
> + u16 sm_churn_partner_timer_counter;
> + u32 churn_actor_count;
> + u32 churn_partner_count;
> + churn_state_t sm_churn_actor_state;
> + churn_state_t sm_churn_partner_state;
> struct slave *slave; /* pointer to the bond slave that this port belongs to */
> struct aggregator *aggregator; /* pointer to an aggregator that this port related to */
> struct port *next_port_in_aggregator; /* Next port on the linked list of the parent aggregator */
> @@ -262,6 +275,22 @@ struct ad_slave_info {
> u16 id;
> };
>
> +static inline const char *bond_3ad_churn_desc(churn_state_t state)
> +{
> + static const char *const churn_description[] =
> + { "monitoring",
> + "churned",
> + "none",
> + "unknown"
> + };
> + int max_size = sizeof(churn_description) / sizeof(churn_description[0]);
> +
> + if (state >= max_size)
> + state = max_size - 1;
> +
> + return churn_description[state];
> +}
> +
> /* ========== AD Exported functions to the main bonding code ========== */
> void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution);
> void bond_3ad_bind_slave(struct slave *slave);
>
--
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