LinuxLists.cc - [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

2024-01-05 00:07:21

Subject: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

2024-01-05 00:07:39

Subject: [PATCH 2/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

Introduces two new states, AD_MUX_COLLECTING and AD_MUX_DISTRIBUTING in
the LACP MUX state machine for separated handling of an initial
Collecting state before the Collecting and Distributing state. This
enables a port to be in a state where it can receive incoming packets
while not still distributing. This is useful for reducing packet loss when
a port begins distributing before its partner is able to collect.
Additionally this also brings the 802.3ad bonding driver's implementation
closer to the LACP specification which already predefined this behaviour,
that is currently the implementation only supports coupled control.

Added new functions such as bond_set_slave_tx_disabled_flags and
bond_set_slave_rx_enabled_flags to precisely manage the port's collecting
and distributing states. Previously, there was no dedicated method to
disable TX while keeping RX enabled, which this patch addresses.

Note that the regular flow process in the kernel's bonding driver remains
unaffected by this patch. The extension requires explicit opt-in by the
user (in order to ensure no disruptions for existing setups) via netlink
support using the new bonding parameter coupled_control. The default value
for coupled_control is set to 1 so as to preserve existing behaviour.

Signed-off-by: Aahil Awatramani <[email protected]>
---
drivers/net/bonding/bond_3ad.c | 159 +++++++++++++++++++++++++++--
drivers/net/bonding/bond_main.c | 1 +
drivers/net/bonding/bond_netlink.c | 16 +++
drivers/net/bonding/bond_options.c | 26 ++++-
include/net/bond_3ad.h | 2 +
include/net/bond_options.h | 1 +
include/net/bonding.h | 23 +++++
include/uapi/linux/if_link.h | 1 +
tools/include/uapi/linux/if_link.h | 1 +
9 files changed, 222 insertions(+), 8 deletions(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index c99ffe6c683a..c2a658f2aaa3 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -106,6 +106,9 @@ 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(struct port *port);
+static void ad_disable_distributing(struct port *port,
+ bool *update_slave_arr);
static void ad_enable_collecting_distributing(struct port *port,
bool *update_slave_arr);
static void ad_disable_collecting_distributing(struct port *port,
@@ -171,9 +174,38 @@ static inline int __agg_has_partner(struct aggregator *agg)
return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
}

+/**
+ * __disable_distributing_port - disable the port's slave for distributing.
+ * Port will still be able to collect.
+ * @port: the port we're looking at
+ *
+ * This will disable only distributing on the port's slave.
+ */
+static inline void __disable_distributing_port(struct port *port)
+{
+ bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
+}
+
+/**
+ * __enable_collecting_port - enable the port's slave for collecting,
+ * if it's up
+ * @port: the port we're looking at
+ *
+ * This will enable only collecting on the port's slave.
+ */
+static inline void __enable_collecting_port(struct port *port)
+{
+ struct slave *slave = port->slave;
+
+ if (slave->link == BOND_LINK_UP && bond_slave_is_up(slave))
+ bond_set_slave_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER);
+}
+
/**
* __disable_port - disable the port's slave
* @port: the port we're looking at
+ *
+ * This will disable both collecting and distributing on the port's slave.
*/
static inline void __disable_port(struct port *port)
{
@@ -183,6 +215,8 @@ static inline void __disable_port(struct port *port)
/**
* __enable_port - enable the port's slave, if it's up
* @port: the port we're looking at
+ *
+ * This will enable both collecting and distributing on the port's slave.
*/
static inline void __enable_port(struct port *port)
{
@@ -193,10 +227,24 @@ static inline void __enable_port(struct port *port)
}

/**
- * __port_is_enabled - check if the port's slave is in active state
+ * __port_should_mux_attached - check if port should transition back to attached
+ * state.
* @port: the port we're looking at
*/
-static inline int __port_is_enabled(struct port *port)
+static inline int __port_should_mux_attached(struct port *port)
+{
+ return !(port->sm_vars & AD_PORT_SELECTED) ||
+ (port->sm_vars & AD_PORT_STANDBY) ||
+ !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
+ !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION);
+}
+
+/**
+ * __port_is_collecting_distributing - check if the port's slave is in the
+ * combined collecting/distributing state
+ * @port: the port we're looking at
+ */
+static inline int __port_is_collecting_distributing(struct port *port)
{
return bond_is_active_slave(port->slave);
}
@@ -942,6 +990,7 @@ static int ad_marker_send(struct port *port, struct bond_marker *marker)
*/
static void ad_mux_machine(struct port *port, bool *update_slave_arr)
{
+ struct bonding *bond = __get_bond_by_port(port);
mux_states_t last_state;

/* keep current State Machine state to compare later if it was
@@ -999,9 +1048,13 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
if ((port->sm_vars & AD_PORT_SELECTED) &&
(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
!__check_agg_selection_timer(port)) {
- if (port->aggregator->is_active)
- port->sm_mux_state =
- AD_MUX_COLLECTING_DISTRIBUTING;
+ if (port->aggregator->is_active) {
+ int state = AD_MUX_COLLECTING_DISTRIBUTING;
+
+ if (!bond->params.coupled_control)
+ state = AD_MUX_COLLECTING;
+ port->sm_mux_state = state;
+ }
} else if (!(port->sm_vars & AD_PORT_SELECTED) ||
(port->sm_vars & AD_PORT_STANDBY)) {
/* if UNSELECTED or STANDBY */
@@ -1019,11 +1072,50 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
}
break;
case AD_MUX_COLLECTING_DISTRIBUTING:
+ if (__port_should_mux_attached(port)) {
+ 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_collecting_distributing(port)) {
+ __enable_port(port);
+ *update_slave_arr = true;
+ }
+ }
+ break;
+ case AD_MUX_COLLECTING:
+ if (__port_should_mux_attached(port)) {
+ port->sm_mux_state = AD_MUX_ATTACHED;
+ } else if ((port->sm_vars & AD_PORT_SELECTED) &&
+ (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
+ (port->partner_oper.port_state & LACP_STATE_COLLECTING)) {
+ port->sm_mux_state = AD_MUX_DISTRIBUTING;
+ } else {
+ /* If port state hasn't changed, make sure that a collecting
+ * port is enabled for an active aggregator.
+ */
+ if (port->aggregator &&
+ port->aggregator->is_active) {
+ struct slave *slave = port->slave;
+
+ if (bond_is_slave_rx_disabled(slave) != 0) {
+ ad_enable_collecting(port);
+ *update_slave_arr = true;
+ }
+ }
+ }
+ break;
+ case AD_MUX_DISTRIBUTING:
if (!(port->sm_vars & AD_PORT_SELECTED) ||
(port->sm_vars & AD_PORT_STANDBY) ||
+ !(port->partner_oper.port_state & LACP_STATE_COLLECTING) ||
!(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
!(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
- port->sm_mux_state = AD_MUX_ATTACHED;
+ port->sm_mux_state = AD_MUX_COLLECTING;
} else {
/* if port state hasn't changed make
* sure that a collecting distributing
@@ -1031,7 +1123,7 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
*/
if (port->aggregator &&
port->aggregator->is_active &&
- !__port_is_enabled(port)) {
+ !__port_is_collecting_distributing(port)) {
__enable_port(port);
*update_slave_arr = true;
}
@@ -1082,6 +1174,20 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
update_slave_arr);
port->ntt = true;
break;
+ case AD_MUX_COLLECTING:
+ port->actor_oper_port_state |= LACP_STATE_COLLECTING;
+ port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
+ port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
+ ad_enable_collecting(port);
+ ad_disable_distributing(port, update_slave_arr);
+ port->ntt = true;
+ break;
+ case AD_MUX_DISTRIBUTING:
+ port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
+ port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
+ ad_enable_collecting_distributing(port,
+ update_slave_arr);
+ break;
default:
break;
}
@@ -1906,6 +2012,45 @@ static void ad_initialize_port(struct port *port, int lacp_fast)
}
}

+/**
+ * ad_enable_collecting - enable a port's receive
+ * @port: the port we're looking at
+ *
+ * Enable @port if it's in an active aggregator
+ */
+static void ad_enable_collecting(struct port *port)
+{
+ if (port->aggregator->is_active) {
+ struct slave *slave = port->slave;
+
+ slave_dbg(slave->bond->dev, slave->dev,
+ "Enabling collecting on port %d (LAG %d)\n",
+ port->actor_port_number,
+ port->aggregator->aggregator_identifier);
+ __enable_collecting_port(port);
+ }
+}
+
+/**
+ * ad_disable_distributing - disable a port's transmit
+ * @port: the port we're looking at
+ * @update_slave_arr: Does slave array need update?
+ */
+static void ad_disable_distributing(struct port *port, bool *update_slave_arr)
+{
+ if (port->aggregator &&
+ !MAC_ADDRESS_EQUAL(&port->aggregator->partner_system,
+ &(null_mac_addr))) {
+ slave_dbg(port->slave->bond->dev, port->slave->dev,
+ "Disabling distributing on port %d (LAG %d)\n",
+ port->actor_port_number,
+ port->aggregator->aggregator_identifier);
+ __disable_distributing_port(port);
+ /* Slave array needs an update */
+ *update_slave_arr = true;
+ }
+}
+
/**
* ad_enable_collecting_distributing - enable a port's transmit/receive
* @port: the port we're looking at
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 8e6cc0e133b7..30f4b0ff01c0 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -6331,6 +6331,7 @@ static int __init bond_check_params(struct bond_params *params)
params->ad_actor_sys_prio = ad_actor_sys_prio;
eth_zero_addr(params->ad_actor_system);
params->ad_user_port_key = ad_user_port_key;
+ params->coupled_control = 1;
if (packets_per_slave > 0) {
params->reciprocal_packets_per_slave =
reciprocal_value(packets_per_slave);
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index cfa74cf8bb1a..29b4c3d1b9b6 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -122,6 +122,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
[IFLA_BOND_PEER_NOTIF_DELAY] = NLA_POLICY_FULL_RANGE(NLA_U32, &delay_range),
[IFLA_BOND_MISSED_MAX] = { .type = NLA_U8 },
[IFLA_BOND_NS_IP6_TARGET] = { .type = NLA_NESTED },
+ [IFLA_BOND_COUPLED_CONTROL] = { .type = NLA_U8 },
};

static const struct nla_policy bond_slave_policy[IFLA_BOND_SLAVE_MAX + 1] = {
@@ -549,6 +550,16 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
return err;
}

+ if (data[IFLA_BOND_COUPLED_CONTROL]) {
+ int coupled_control = nla_get_u8(data[IFLA_BOND_COUPLED_CONTROL]);
+
+ bond_opt_initval(&newval, coupled_control);
+ err = __bond_opt_set(bond, BOND_OPT_COUPLED_CONTROL, &newval,
+ data[IFLA_BOND_COUPLED_CONTROL], extack);
+ if (err)
+ return err;
+ }
+
return 0;
}

@@ -615,6 +626,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
/* IFLA_BOND_NS_IP6_TARGET */
nla_total_size(sizeof(struct nlattr)) +
nla_total_size(sizeof(struct in6_addr)) * BOND_MAX_NS_TARGETS +
+ nla_total_size(sizeof(u8)) + /* IFLA_BOND_COUPLED_CONTROL */
0;
}

@@ -774,6 +786,10 @@ static int bond_fill_info(struct sk_buff *skb,
bond->params.missed_max))
goto nla_put_failure;

+ if (nla_put_u8(skb, IFLA_BOND_COUPLED_CONTROL,
+ bond->params.coupled_control))
+ goto nla_put_failure;
+
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
struct ad_info info;

diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index f3f27f0bd2a6..af5d3c57700b 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -84,7 +84,8 @@ static int bond_option_ad_user_port_key_set(struct bonding *bond,
const struct bond_opt_value *newval);
static int bond_option_missed_max_set(struct bonding *bond,
const struct bond_opt_value *newval);
-
+static int bond_option_coupled_control_set(struct bonding *bond,
+ const struct bond_opt_value *newval);

static const struct bond_opt_value bond_mode_tbl[] = {
{ "balance-rr", BOND_MODE_ROUNDROBIN, BOND_VALFLAG_DEFAULT},
@@ -232,6 +233,12 @@ static const struct bond_opt_value bond_missed_max_tbl[] = {
{ NULL, -1, 0},
};

+static const struct bond_opt_value bond_coupled_control_tbl[] = {
+ { "on", 1, BOND_VALFLAG_DEFAULT},
+ { "off", 0, 0},
+ { NULL, -1, 0},
+};
+
static const struct bond_option bond_opts[BOND_OPT_LAST] = {
[BOND_OPT_MODE] = {
.id = BOND_OPT_MODE,
@@ -496,6 +503,14 @@ static const struct bond_option bond_opts[BOND_OPT_LAST] = {
.desc = "Delay between each peer notification on failover event, in milliseconds",
.values = bond_peer_notif_delay_tbl,
.set = bond_option_peer_notif_delay_set
+ },
+ [BOND_OPT_COUPLED_CONTROL] = {
+ .id = BOND_OPT_COUPLED_CONTROL,
+ .name = "coupled_control",
+ .desc = "Opt into using coupled control MUX for LACP states",
+ .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
+ .values = bond_coupled_control_tbl,
+ .set = bond_option_coupled_control_set,
}
};

@@ -1692,3 +1707,12 @@ static int bond_option_ad_user_port_key_set(struct bonding *bond,
bond->params.ad_user_port_key = newval->value;
return 0;
}
+
+static int bond_option_coupled_control_set(struct bonding *bond,
+ const struct bond_opt_value *newval)
+{
+ netdev_info(bond->dev, "Setting coupled_control to %s (%llu)\n",
+ newval->string, newval->value);
+ bond->params.coupled_control = newval->value;
+ return 0;
+}
diff --git a/include/net/bond_3ad.h b/include/net/bond_3ad.h
index c5e57c6bd873..9ce5ac2bfbad 100644
--- a/include/net/bond_3ad.h
+++ b/include/net/bond_3ad.h
@@ -54,6 +54,8 @@ typedef enum {
AD_MUX_DETACHED, /* mux machine */
AD_MUX_WAITING, /* mux machine */
AD_MUX_ATTACHED, /* mux machine */
+ AD_MUX_COLLECTING, /* mux machine */
+ AD_MUX_DISTRIBUTING, /* mux machine */
AD_MUX_COLLECTING_DISTRIBUTING /* mux machine */
} mux_states_t;

diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index 69292ecc0325..473a0147769e 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -76,6 +76,7 @@ enum {
BOND_OPT_MISSED_MAX,
BOND_OPT_NS_TARGETS,
BOND_OPT_PRIO,
+ BOND_OPT_COUPLED_CONTROL,
BOND_OPT_LAST
};

diff --git a/include/net/bonding.h b/include/net/bonding.h
index 5b8b1b644a2d..b61fb1aa3a56 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -148,6 +148,7 @@ struct bond_params {
#if IS_ENABLED(CONFIG_IPV6)
struct in6_addr ns_targets[BOND_MAX_NS_TARGETS];
#endif
+ int coupled_control;

/* 2 bytes of padding : see ether_addr_equal_64bits() */
u8 ad_actor_system[ETH_ALEN + 2];
@@ -167,6 +168,7 @@ struct slave {
u8 backup:1, /* indicates backup slave. Value corresponds with
BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
inactive:1, /* indicates inactive slave */
+ rx_disabled:1, /* indicates whether slave's Rx is disabled */
should_notify:1, /* indicates whether the state changed */
should_notify_link:1; /* indicates whether the link changed */
u8 duplex;
@@ -568,6 +570,14 @@ static inline void bond_set_slave_inactive_flags(struct slave *slave,
bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
if (!slave->bond->params.all_slaves_active)
slave->inactive = 1;
+ if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
+ slave->rx_disabled = 1;
+}
+
+static inline void bond_set_slave_tx_disabled_flags(struct slave *slave,
+ bool notify)
+{
+ bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
}

static inline void bond_set_slave_active_flags(struct slave *slave,
@@ -575,6 +585,14 @@ static inline void bond_set_slave_active_flags(struct slave *slave,
{
bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
slave->inactive = 0;
+ if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
+ slave->rx_disabled = 0;
+}
+
+static inline void bond_set_slave_rx_enabled_flags(struct slave *slave,
+ bool notify)
+{
+ slave->rx_disabled = 0;
}

static inline bool bond_is_slave_inactive(struct slave *slave)
@@ -582,6 +600,11 @@ static inline bool bond_is_slave_inactive(struct slave *slave)
return slave->inactive;
}

+static inline bool bond_is_slave_rx_disabled(struct slave *slave)
+{
+ return slave->rx_disabled;
+}
+
static inline void bond_propose_link_state(struct slave *slave, int state)
{
slave->link_new_state = state;
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 29ff80da2775..7a54fcff2eec 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -976,6 +976,7 @@ enum {
IFLA_BOND_AD_LACP_ACTIVE,
IFLA_BOND_MISSED_MAX,
IFLA_BOND_NS_IP6_TARGET,
+ IFLA_BOND_COUPLED_CONTROL,
__IFLA_BOND_MAX,
};

diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h
index a0aa05a28cf2..f0d71b2a3f1e 100644
--- a/tools/include/uapi/linux/if_link.h
+++ b/tools/include/uapi/linux/if_link.h
@@ -974,6 +974,7 @@ enum {
IFLA_BOND_AD_LACP_ACTIVE,
IFLA_BOND_MISSED_MAX,
IFLA_BOND_NS_IP6_TARGET,
+ IFLA_BOND_COUPLED_CONTROL,
__IFLA_BOND_MAX,
};

--
2.43.0.472.g3155946c3a-goog

2024-01-05 01:36:12

by Jay Vosburgh

[permalink] [raw]

Subject: Re: [PATCH 2/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

Aahil Awatramani <[email protected]> wrote:

>Introduces two new states, AD_MUX_COLLECTING and AD_MUX_DISTRIBUTING in
>the LACP MUX state machine for separated handling of an initial
>Collecting state before the Collecting and Distributing state. This
>enables a port to be in a state where it can receive incoming packets
>while not still distributing. This is useful for reducing packet loss when
>a port begins distributing before its partner is able to collect.
>Additionally this also brings the 802.3ad bonding driver's implementation
>closer to the LACP specification which already predefined this behaviour,
>that is currently the implementation only supports coupled control.

I think this last sentence is (a) unclear, and (b) should be
first in the paragraph; I'd suggest something like:

Add support for the independent control state machine per IEEE
802.1AX-2008 5.4.15 in addition to the existing implementation of the
coupled control state machine.

The Subject should change in a similar way, e.g., "Add
independent control state machine."

>Added new functions such as bond_set_slave_tx_disabled_flags and
>bond_set_slave_rx_enabled_flags to precisely manage the port's collecting
>and distributing states. Previously, there was no dedicated method to
>disable TX while keeping RX enabled, which this patch addresses.
>
>Note that the regular flow process in the kernel's bonding driver remains
>unaffected by this patch. The extension requires explicit opt-in by the
>user (in order to ensure no disruptions for existing setups) via netlink
>support using the new bonding parameter coupled_control. The default value
>for coupled_control is set to 1 so as to preserve existing behaviour.

How did you test this to insure that the new logic works
correctly against both coupled and independent control implementations?

>Signed-off-by: Aahil Awatramani <[email protected]>
>---
> drivers/net/bonding/bond_3ad.c | 159 +++++++++++++++++++++++++++--
> drivers/net/bonding/bond_main.c | 1 +
> drivers/net/bonding/bond_netlink.c | 16 +++
> drivers/net/bonding/bond_options.c | 26 ++++-
> include/net/bond_3ad.h | 2 +
> include/net/bond_options.h | 1 +
> include/net/bonding.h | 23 +++++
> include/uapi/linux/if_link.h | 1 +
> tools/include/uapi/linux/if_link.h | 1 +
> 9 files changed, 222 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
>index c99ffe6c683a..c2a658f2aaa3 100644
>--- a/drivers/net/bonding/bond_3ad.c
>+++ b/drivers/net/bonding/bond_3ad.c
>@@ -106,6 +106,9 @@ 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(struct port *port);
>+static void ad_disable_distributing(struct port *port,
>+ bool *update_slave_arr);
> static void ad_enable_collecting_distributing(struct port *port,
> bool *update_slave_arr);
> static void ad_disable_collecting_distributing(struct port *port,
>@@ -171,9 +174,38 @@ static inline int __agg_has_partner(struct aggregator *agg)
> return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
> }
>
>+/**
>+ * __disable_distributing_port - disable the port's slave for distributing.
>+ * Port will still be able to collect.
>+ * @port: the port we're looking at
>+ *
>+ * This will disable only distributing on the port's slave.
>+ */
>+static inline void __disable_distributing_port(struct port *port)
>+{
>+ bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
>+}
>+
>+/**
>+ * __enable_collecting_port - enable the port's slave for collecting,
>+ * if it's up
>+ * @port: the port we're looking at
>+ *
>+ * This will enable only collecting on the port's slave.
>+ */
>+static inline void __enable_collecting_port(struct port *port)
>+{
>+ struct slave *slave = port->slave;
>+
>+ if (slave->link == BOND_LINK_UP && bond_slave_is_up(slave))
>+ bond_set_slave_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER);
>+}
>+
> /**
> * __disable_port - disable the port's slave
> * @port: the port we're looking at
>+ *
>+ * This will disable both collecting and distributing on the port's slave.
> */
> static inline void __disable_port(struct port *port)
> {
>@@ -183,6 +215,8 @@ static inline void __disable_port(struct port *port)
> /**
> * __enable_port - enable the port's slave, if it's up
> * @port: the port we're looking at
>+ *
>+ * This will enable both collecting and distributing on the port's slave.
> */
> static inline void __enable_port(struct port *port)
> {
>@@ -193,10 +227,24 @@ static inline void __enable_port(struct port *port)
> }
>
> /**
>- * __port_is_enabled - check if the port's slave is in active state
>+ * __port_should_mux_attached - check if port should transition back to attached
>+ * state.
> * @port: the port we're looking at
> */
>-static inline int __port_is_enabled(struct port *port)
>+static inline int __port_should_mux_attached(struct port *port)

This name seems suboptimal, perhaps __port_should_goto_attached_state?

I'll also note that every use of this function then immediately
executes "port->sm_mux_state = AD_MUX_ATTACHED", this could plausibly be
combined into a __port_move_to_attached_state function that returns true
or false, e.g.,

if (__port_should_mux_attached(port)) {
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 &&

would become something like:

if (!__port_move_to_attached_state(port)) {
/* 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 &&

>+{
>+ return !(port->sm_vars & AD_PORT_SELECTED) ||
>+ (port->sm_vars & AD_PORT_STANDBY) ||
>+ !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
>+ !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION);
>+}
>+
>+/**
>+ * __port_is_collecting_distributing - check if the port's slave is in the
>+ * combined collecting/distributing state
>+ * @port: the port we're looking at
>+ */
>+static inline int __port_is_collecting_distributing(struct port *port)
> {
> return bond_is_active_slave(port->slave);
> }
>@@ -942,6 +990,7 @@ static int ad_marker_send(struct port *port, struct bond_marker *marker)
> */
> static void ad_mux_machine(struct port *port, bool *update_slave_arr)
> {
>+ struct bonding *bond = __get_bond_by_port(port);
> mux_states_t last_state;
>
> /* keep current State Machine state to compare later if it was
>@@ -999,9 +1048,13 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
> if ((port->sm_vars & AD_PORT_SELECTED) &&
> (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
> !__check_agg_selection_timer(port)) {
>- if (port->aggregator->is_active)
>- port->sm_mux_state =
>- AD_MUX_COLLECTING_DISTRIBUTING;
>+ if (port->aggregator->is_active) {
>+ int state = AD_MUX_COLLECTING_DISTRIBUTING;
>+
>+ if (!bond->params.coupled_control)
>+ state = AD_MUX_COLLECTING;
>+ port->sm_mux_state = state;
>+ }
> } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
> (port->sm_vars & AD_PORT_STANDBY)) {
> /* if UNSELECTED or STANDBY */
>@@ -1019,11 +1072,50 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
> }
> break;
> case AD_MUX_COLLECTING_DISTRIBUTING:
>+ if (__port_should_mux_attached(port)) {
>+ 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 &&

Is it possible for port->aggregator to be NULL here? I don't
think it's possible for a port to get to this state and not be attached
to an aggregator (it has to be SELECTED by this point).

This test logic could also be moved into a helper function if
the NULL check is necessary.

>+ !__port_is_collecting_distributing(port)) {
>+ __enable_port(port);
>+ *update_slave_arr = true;
>+ }
>+ }
>+ break;
>+ case AD_MUX_COLLECTING:
>+ if (__port_should_mux_attached(port)) {
>+ port->sm_mux_state = AD_MUX_ATTACHED;
>+ } else if ((port->sm_vars & AD_PORT_SELECTED) &&
>+ (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
>+ (port->partner_oper.port_state & LACP_STATE_COLLECTING)) {
>+ port->sm_mux_state = AD_MUX_DISTRIBUTING;
>+ } else {
>+ /* If port state hasn't changed, make sure that a collecting
>+ * port is enabled for an active aggregator.
>+ */
>+ if (port->aggregator &&
>+ port->aggregator->is_active) {

Same comment as previous.

>+ struct slave *slave = port->slave;
>+
>+ if (bond_is_slave_rx_disabled(slave) != 0) {

The "!= 0" is superfluous here as bond_is_slave_rx_disabled()
returns a boolean.

>+ ad_enable_collecting(port);
>+ *update_slave_arr = true;
>+ }
>+ }
>+ }
>+ break;
>+ case AD_MUX_DISTRIBUTING:
> if (!(port->sm_vars & AD_PORT_SELECTED) ||
> (port->sm_vars & AD_PORT_STANDBY) ||
>+ !(port->partner_oper.port_state & LACP_STATE_COLLECTING) ||
> !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
> !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
>- port->sm_mux_state = AD_MUX_ATTACHED;
>+ port->sm_mux_state = AD_MUX_COLLECTING;
> } else {
> /* if port state hasn't changed make
> * sure that a collecting distributing
>@@ -1031,7 +1123,7 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
> */
> if (port->aggregator &&
> port->aggregator->is_active &&
>- !__port_is_enabled(port)) {
>+ !__port_is_collecting_distributing(port)) {
> __enable_port(port);
> *update_slave_arr = true;
> }
>@@ -1082,6 +1174,20 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
> update_slave_arr);
> port->ntt = true;
> break;
>+ case AD_MUX_COLLECTING:
>+ port->actor_oper_port_state |= LACP_STATE_COLLECTING;
>+ port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
>+ port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
>+ ad_enable_collecting(port);
>+ ad_disable_distributing(port, update_slave_arr);
>+ port->ntt = true;
>+ break;
>+ case AD_MUX_DISTRIBUTING:
>+ port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
>+ port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
>+ ad_enable_collecting_distributing(port,
>+ update_slave_arr);
>+ break;
> default:
> break;
> }
>@@ -1906,6 +2012,45 @@ static void ad_initialize_port(struct port *port, int lacp_fast)
> }
> }
>
>+/**
>+ * ad_enable_collecting - enable a port's receive
>+ * @port: the port we're looking at
>+ *
>+ * Enable @port if it's in an active aggregator
>+ */
>+static void ad_enable_collecting(struct port *port)
>+{
>+ if (port->aggregator->is_active) {
>+ struct slave *slave = port->slave;
>+
>+ slave_dbg(slave->bond->dev, slave->dev,
>+ "Enabling collecting on port %d (LAG %d)\n",
>+ port->actor_port_number,
>+ port->aggregator->aggregator_identifier);
>+ __enable_collecting_port(port);
>+ }
>+}
>+
>+/**
>+ * ad_disable_distributing - disable a port's transmit
>+ * @port: the port we're looking at
>+ * @update_slave_arr: Does slave array need update?
>+ */
>+static void ad_disable_distributing(struct port *port, bool *update_slave_arr)
>+{
>+ if (port->aggregator &&
>+ !MAC_ADDRESS_EQUAL(&port->aggregator->partner_system,
>+ &(null_mac_addr))) {
>+ slave_dbg(port->slave->bond->dev, port->slave->dev,
>+ "Disabling distributing on port %d (LAG %d)\n",
>+ port->actor_port_number,
>+ port->aggregator->aggregator_identifier);
>+ __disable_distributing_port(port);
>+ /* Slave array needs an update */
>+ *update_slave_arr = true;
>+ }
>+}
>+
> /**
> * ad_enable_collecting_distributing - enable a port's transmit/receive
> * @port: the port we're looking at
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 8e6cc0e133b7..30f4b0ff01c0 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -6331,6 +6331,7 @@ static int __init bond_check_params(struct bond_params *params)
> params->ad_actor_sys_prio = ad_actor_sys_prio;
> eth_zero_addr(params->ad_actor_system);
> params->ad_user_port_key = ad_user_port_key;
>+ params->coupled_control = 1;
> if (packets_per_slave > 0) {
> params->reciprocal_packets_per_slave =
> reciprocal_value(packets_per_slave);
>diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
>index cfa74cf8bb1a..29b4c3d1b9b6 100644
>--- a/drivers/net/bonding/bond_netlink.c
>+++ b/drivers/net/bonding/bond_netlink.c
>@@ -122,6 +122,7 @@ static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
> [IFLA_BOND_PEER_NOTIF_DELAY] = NLA_POLICY_FULL_RANGE(NLA_U32, &delay_range),
> [IFLA_BOND_MISSED_MAX] = { .type = NLA_U8 },
> [IFLA_BOND_NS_IP6_TARGET] = { .type = NLA_NESTED },
>+ [IFLA_BOND_COUPLED_CONTROL] = { .type = NLA_U8 },
> };
>
> static const struct nla_policy bond_slave_policy[IFLA_BOND_SLAVE_MAX + 1] = {
>@@ -549,6 +550,16 @@ static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[],
> return err;
> }
>
>+ if (data[IFLA_BOND_COUPLED_CONTROL]) {
>+ int coupled_control = nla_get_u8(data[IFLA_BOND_COUPLED_CONTROL]);
>+
>+ bond_opt_initval(&newval, coupled_control);
>+ err = __bond_opt_set(bond, BOND_OPT_COUPLED_CONTROL, &newval,
>+ data[IFLA_BOND_COUPLED_CONTROL], extack);
>+ if (err)
>+ return err;
>+ }
>+
> return 0;
> }
>
>@@ -615,6 +626,7 @@ static size_t bond_get_size(const struct net_device *bond_dev)
> /* IFLA_BOND_NS_IP6_TARGET */
> nla_total_size(sizeof(struct nlattr)) +
> nla_total_size(sizeof(struct in6_addr)) * BOND_MAX_NS_TARGETS +
>+ nla_total_size(sizeof(u8)) + /* IFLA_BOND_COUPLED_CONTROL */
> 0;
> }
>
>@@ -774,6 +786,10 @@ static int bond_fill_info(struct sk_buff *skb,
> bond->params.missed_max))
> goto nla_put_failure;
>
>+ if (nla_put_u8(skb, IFLA_BOND_COUPLED_CONTROL,
>+ bond->params.coupled_control))
>+ goto nla_put_failure;
>+
> if (BOND_MODE(bond) == BOND_MODE_8023AD) {
> struct ad_info info;
>
>diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
>index f3f27f0bd2a6..af5d3c57700b 100644
>--- a/drivers/net/bonding/bond_options.c
>+++ b/drivers/net/bonding/bond_options.c
>@@ -84,7 +84,8 @@ static int bond_option_ad_user_port_key_set(struct bonding *bond,
> const struct bond_opt_value *newval);
> static int bond_option_missed_max_set(struct bonding *bond,
> const struct bond_opt_value *newval);
>-
>+static int bond_option_coupled_control_set(struct bonding *bond,
>+ const struct bond_opt_value *newval);
>
> static const struct bond_opt_value bond_mode_tbl[] = {
> { "balance-rr", BOND_MODE_ROUNDROBIN, BOND_VALFLAG_DEFAULT},
>@@ -232,6 +233,12 @@ static const struct bond_opt_value bond_missed_max_tbl[] = {
> { NULL, -1, 0},
> };
>
>+static const struct bond_opt_value bond_coupled_control_tbl[] = {
>+ { "on", 1, BOND_VALFLAG_DEFAULT},
>+ { "off", 0, 0},
>+ { NULL, -1, 0},
>+};
>+
> static const struct bond_option bond_opts[BOND_OPT_LAST] = {
> [BOND_OPT_MODE] = {
> .id = BOND_OPT_MODE,
>@@ -496,6 +503,14 @@ static const struct bond_option bond_opts[BOND_OPT_LAST] = {
> .desc = "Delay between each peer notification on failover event, in milliseconds",
> .values = bond_peer_notif_delay_tbl,
> .set = bond_option_peer_notif_delay_set
>+ },
>+ [BOND_OPT_COUPLED_CONTROL] = {
>+ .id = BOND_OPT_COUPLED_CONTROL,
>+ .name = "coupled_control",
>+ .desc = "Opt into using coupled control MUX for LACP states",
>+ .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
>+ .values = bond_coupled_control_tbl,
>+ .set = bond_option_coupled_control_set,
> }
> };
>
>@@ -1692,3 +1707,12 @@ static int bond_option_ad_user_port_key_set(struct bonding *bond,
> bond->params.ad_user_port_key = newval->value;
> return 0;
> }
>+
>+static int bond_option_coupled_control_set(struct bonding *bond,
>+ const struct bond_opt_value *newval)
>+{
>+ netdev_info(bond->dev, "Setting coupled_control to %s (%llu)\n",
>+ newval->string, newval->value);
>+ bond->params.coupled_control = newval->value;
>+ return 0;
>+}

I believe this should permit changes to coupled_control only if
the bond is down, or up with no interfaces attached to it. The two
state machines are not interchangable.

-J

>diff --git a/include/net/bond_3ad.h b/include/net/bond_3ad.h
>index c5e57c6bd873..9ce5ac2bfbad 100644
>--- a/include/net/bond_3ad.h
>+++ b/include/net/bond_3ad.h
>@@ -54,6 +54,8 @@ typedef enum {
> AD_MUX_DETACHED, /* mux machine */
> AD_MUX_WAITING, /* mux machine */
> AD_MUX_ATTACHED, /* mux machine */
>+ AD_MUX_COLLECTING, /* mux machine */
>+ AD_MUX_DISTRIBUTING, /* mux machine */
> AD_MUX_COLLECTING_DISTRIBUTING /* mux machine */
> } mux_states_t;
>
>diff --git a/include/net/bond_options.h b/include/net/bond_options.h
>index 69292ecc0325..473a0147769e 100644
>--- a/include/net/bond_options.h
>+++ b/include/net/bond_options.h
>@@ -76,6 +76,7 @@ enum {
> BOND_OPT_MISSED_MAX,
> BOND_OPT_NS_TARGETS,
> BOND_OPT_PRIO,
>+ BOND_OPT_COUPLED_CONTROL,
> BOND_OPT_LAST
> };
>
>diff --git a/include/net/bonding.h b/include/net/bonding.h
>index 5b8b1b644a2d..b61fb1aa3a56 100644
>--- a/include/net/bonding.h
>+++ b/include/net/bonding.h
>@@ -148,6 +148,7 @@ struct bond_params {
> #if IS_ENABLED(CONFIG_IPV6)
> struct in6_addr ns_targets[BOND_MAX_NS_TARGETS];
> #endif
>+ int coupled_control;
>
> /* 2 bytes of padding : see ether_addr_equal_64bits() */
> u8 ad_actor_system[ETH_ALEN + 2];
>@@ -167,6 +168,7 @@ struct slave {
> u8 backup:1, /* indicates backup slave. Value corresponds with
> BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
> inactive:1, /* indicates inactive slave */
>+ rx_disabled:1, /* indicates whether slave's Rx is disabled */
> should_notify:1, /* indicates whether the state changed */
> should_notify_link:1; /* indicates whether the link changed */
> u8 duplex;
>@@ -568,6 +570,14 @@ static inline void bond_set_slave_inactive_flags(struct slave *slave,
> bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
> if (!slave->bond->params.all_slaves_active)
> slave->inactive = 1;
>+ if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
>+ slave->rx_disabled = 1;
>+}
>+
>+static inline void bond_set_slave_tx_disabled_flags(struct slave *slave,
>+ bool notify)
>+{
>+ bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
> }
>
> static inline void bond_set_slave_active_flags(struct slave *slave,
>@@ -575,6 +585,14 @@ static inline void bond_set_slave_active_flags(struct slave *slave,
> {
> bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
> slave->inactive = 0;
>+ if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
>+ slave->rx_disabled = 0;
>+}
>+
>+static inline void bond_set_slave_rx_enabled_flags(struct slave *slave,
>+ bool notify)
>+{
>+ slave->rx_disabled = 0;
> }
>
> static inline bool bond_is_slave_inactive(struct slave *slave)
>@@ -582,6 +600,11 @@ static inline bool bond_is_slave_inactive(struct slave *slave)
> return slave->inactive;
> }
>
>+static inline bool bond_is_slave_rx_disabled(struct slave *slave)
>+{
>+ return slave->rx_disabled;
>+}
>+
> static inline void bond_propose_link_state(struct slave *slave, int state)
> {
> slave->link_new_state = state;
>diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>index 29ff80da2775..7a54fcff2eec 100644
>--- a/include/uapi/linux/if_link.h
>+++ b/include/uapi/linux/if_link.h
>@@ -976,6 +976,7 @@ enum {
> IFLA_BOND_AD_LACP_ACTIVE,
> IFLA_BOND_MISSED_MAX,
> IFLA_BOND_NS_IP6_TARGET,
>+ IFLA_BOND_COUPLED_CONTROL,
> __IFLA_BOND_MAX,
> };
>
>diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h
>index a0aa05a28cf2..f0d71b2a3f1e 100644
>--- a/tools/include/uapi/linux/if_link.h
>+++ b/tools/include/uapi/linux/if_link.h
>@@ -974,6 +974,7 @@ enum {
> IFLA_BOND_AD_LACP_ACTIVE,
> IFLA_BOND_MISSED_MAX,
> IFLA_BOND_NS_IP6_TARGET,
>+ IFLA_BOND_COUPLED_CONTROL,
> __IFLA_BOND_MAX,
> };
>
>--
>2.43.0.472.g3155946c3a-goog
>
>

---
-Jay Vosburgh, [email protected]

2024-01-05 01:39:06

by Jay Vosburgh

[permalink] [raw]

Subject: Re: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

2024-01-08 03:47:11

by Hangbin Liu

[permalink] [raw]

Subject: Re: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

On Thu, Jan 04, 2024 at 05:38:52PM -0800, Jay Vosburgh wrote:
> >+coupled_control
> >+
> >+ Specifies whether the LACP state machine's MUX in the 802.3ad mode
> >+ should have separate Collecting and Distributing states.
> >+
> >+ The default value is 1. This setting does not separate the Collecting
> >+ and Distributing states, maintaining the bond in coupled control.
> >+
>
> Please reference the standard in the description; this is
> implementing the independent control state machine per IEEE 802.1AX-2008
> 5.4.15 in addition to the existing coupled control state machine.

The status of IEEE 802.1AX-2008[1] is "Superseded Standard". Maybe we should
use IEEE 802.1AX-2020[2].

[1] https://standards.ieee.org/ieee/802.1AX/4176/
[2] https://standards.ieee.org/ieee/802.1AX/6768/

Thanks
Hangbin

2024-01-09 19:07:19

by Aahil Awatramani

[permalink] [raw]

Subject: Re: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

Thank you folk for your feedback.

Currently due to travelling reasons there will be a slight delay in my updates
but this should be resolved soon and I should be able to provide quicker
iterative feedback.

Thank you again for your reviews,
Aahil

On Sun, Jan 7, 2024 at 7:46 PM Hangbin Liu <[email protected]> wrote:
>
> On Thu, Jan 04, 2024 at 05:38:52PM -0800, Jay Vosburgh wrote:
> > >+coupled_control
> > >+
> > >+ Specifies whether the LACP state machine's MUX in the 802.3ad mode
> > >+ should have separate Collecting and Distributing states.
> > >+
> > >+ The default value is 1. This setting does not separate the Collecting
> > >+ and Distributing states, maintaining the bond in coupled control.
> > >+
> >
> > Please reference the standard in the description; this is
> > implementing the independent control state machine per IEEE 802.1AX-2008
> > 5.4.15 in addition to the existing coupled control state machine.
>
> The status of IEEE 802.1AX-2008[1] is "Superseded Standard". Maybe we should
> use IEEE 802.1AX-2020[2].
>
> [1] https://standards.ieee.org/ieee/802.1AX/4176/
> [2] https://standards.ieee.org/ieee/802.1AX/6768/
>
> Thanks
> Hangbin

2024-01-09 19:56:50

by Jay Vosburgh

[permalink] [raw]

Subject: Re: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

Hangbin Liu <[email protected]> wrote:

>On Thu, Jan 04, 2024 at 05:38:52PM -0800, Jay Vosburgh wrote:
>> >+coupled_control
>> >+
>> >+ Specifies whether the LACP state machine's MUX in the 802.3ad mode
>> >+ should have separate Collecting and Distributing states.
>> >+
>> >+ The default value is 1. This setting does not separate the Collecting
>> >+ and Distributing states, maintaining the bond in coupled control.
>> >+
>>
>> Please reference the standard in the description; this is
>> implementing the independent control state machine per IEEE 802.1AX-2008
>> 5.4.15 in addition to the existing coupled control state machine.
>
>The status of IEEE 802.1AX-2008[1] is "Superseded Standard". Maybe we should
>use IEEE 802.1AX-2020[2].
>
>[1] https://standards.ieee.org/ieee/802.1AX/4176/
>[2] https://standards.ieee.org/ieee/802.1AX/6768/

I'm fine to still reference the 2008 (or 2014) standard even
though it's superseded; the 2020 standard is much more complicated, and
I find it harder to follow (particularly for the coupled / independent
control sections, the older standard explains them more clearly in my
reading). Bonding does not implement any of the new things added for
the 2020 version, so we're not really missing anything.

That said, as long as the citations are for the correct section
(the numbering is not consistent between versions) any version is
acceptable.

-J

---
-Jay Vosburgh, [email protected]

2024-01-11 20:32:09

by Aahil Awatramani

[permalink] [raw]

Subject: Re: [PATCH 1/2 net-next v2] bonding: Extending LACP MUX State Machine to include a Collecting State.

> > >> Please reference the standard in the description; this is
> > >> implementing the independent control state machine per IEEE 802.1AX-2008
> > >> 5.4.15 in addition to the existing coupled control state machine.
> > >
> > >The status of IEEE 802.1AX-2008[1] is "Superseded Standard". Maybe we should
> > >use IEEE 802.1AX-2020[2].
> > >
> > >[1] https://standards.ieee.org/ieee/802.1AX/4176/
> > >[2] https://standards.ieee.org/ieee/802.1AX/6768/
> >
> > I'm fine to still reference the 2008 (or 2014) standard even
> > though it's superseded; the 2020 standard is much more complicated, and
> > I find it harder to follow (particularly for the coupled / independent
> > control sections, the older standard explains them more clearly in my
> > reading). Bonding does not implement any of the new things added for
> > the 2020 version, so we're not really missing anything.
> >
> > That said, as long as the citations are for the correct section
> > (the numbering is not consistent between versions) any version is
> > acceptable.

I have gone ahead and referenced 2008 in the documentation.

On Tue, Jan 9, 2024 at 11:53 AM Jay Vosburgh <[email protected]> wrote:
>
> Hangbin Liu <[email protected]> wrote:
>
> >On Thu, Jan 04, 2024 at 05:38:52PM -0800, Jay Vosburgh wrote:
> >> >+coupled_control
> >> >+
> >> >+ Specifies whether the LACP state machine's MUX in the 802.3ad mode
> >> >+ should have separate Collecting and Distributing states.
> >> >+
> >> >+ The default value is 1. This setting does not separate the Collecting
> >> >+ and Distributing states, maintaining the bond in coupled control.
> >> >+
> >>
> >> Please reference the standard in the description; this is
> >> implementing the independent control state machine per IEEE 802.1AX-2008
> >> 5.4.15 in addition to the existing coupled control state machine.
> >
> >The status of IEEE 802.1AX-2008[1] is "Superseded Standard". Maybe we should
> >use IEEE 802.1AX-2020[2].
> >
> >[1] https://standards.ieee.org/ieee/802.1AX/4176/
> >[2] https://standards.ieee.org/ieee/802.1AX/6768/
>
> I'm fine to still reference the 2008 (or 2014) standard even
> though it's superseded; the 2020 standard is much more complicated, and
> I find it harder to follow (particularly for the coupled / independent
> control sections, the older standard explains them more clearly in my
> reading). Bonding does not implement any of the new things added for
> the 2020 version, so we're not really missing anything.
>
> That said, as long as the citations are for the correct section
> (the numbering is not consistent between versions) any version is
> acceptable.
>
> -J
>
> ---
> -Jay Vosburgh, [email protected]