[v2] net/bonding: change the state machine to defaulted

  From: Weifeng Li <liweifeng2@huawei.com>

A dpdk bonding 802.3ad network as follows:
+----------+                     +-----------+
|dpdk lacp |slave1 <------> port1|switch lacp|
|          |slave2 <------> port2|           |
+----------+                     +-----------+
If a fiber optic go wrong about single pass during normal running like
this:
slave2 -----> port2 ok
slave2 <----- port2 error: salve2 receive no LACPDU Some packets from
			   switch to dpdk will choose port2 and lost.

DPDK lacp state machine will transits to the expired state if no LACPDU
is received before the current_while_timer expires. But if no LACPDU is
received before the current_while_timer expires again, DPDK lacp state
machine has no change. Port2 can not change to inactive depend on the
received LACPDU.
According to IEEE 802.3ad, if no lacpdu is received before the
current_while_timer expires again, the state machine should transits from
expired to defaulted. Port2 will change to inactive depend on the LACPDU
with defaulted state.

This patch adds a state machine change from expired to defaulted when no
lacpdu is received before the current_while_timer expires again according
to IEEE 802.3ad:
If no LACPDU is received before the current_while timer expires again,
the state machine transits to the DEFAULTED state. The record Default
function overwrites the current operational parameters for the Partner
with administratively configured values. This allows configuration of
aggregations and individual links when no protocol partner is present,
while still permitting an active partner to override default settings.
The update_Default_Selected function sets the Selected variable FALSE
if the Link Aggregation Group has changed. Since all operational parameters
are now set to locally administered values there can be no disagreement as
to the Link Aggregation Group, so the Matched variable is set TRUE.

The relevant description is in the chapter 43.4.12 of the link below:
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=850426

Signed-off-by: Weifeng Li <liweifeng2@huawei.com>
---
v1 -> v2: adjust the formate of commit log
---
 drivers/net/bonding/eth_bond_8023ad_private.h |  2 ++
 drivers/net/bonding/rte_eth_bond_8023ad.c     | 21 +++++++++++++++++----
 2 files changed, 19 insertions(+), 4 deletions(-)
  

Hi, Weifeng Li


On 2020/7/7 22:38, Weifeng Li wrote:
> From: Weifeng Li <liweifeng2@huawei.com>
>
> A dpdk bonding 802.3ad network as follows:
> +----------+                     +-----------+
> |dpdk lacp |slave1 <------> port1|switch lacp|
> |          |slave2 <------> port2|           |
> +----------+                     +-----------+
> If a fiber optic go wrong about single pass during normal running like
> this:
> slave2 -----> port2 ok
> slave2 <----- port2 error: salve2 receive no LACPDU Some packets from
> 			   switch to dpdk will choose port2 and lost.
>
> DPDK lacp state machine will transits to the expired state if no LACPDU
> is received before the current_while_timer expires. But if no LACPDU is
> received before the current_while_timer expires again, DPDK lacp state
> machine has no change. Port2 can not change to inactive depend on the
> received LACPDU.
> According to IEEE 802.3ad, if no lacpdu is received before the
> current_while_timer expires again, the state machine should transits from
> expired to defaulted. Port2 will change to inactive depend on the LACPDU
> with defaulted state.
>
> This patch adds a state machine change from expired to defaulted when no
> lacpdu is received before the current_while_timer expires again according
> to IEEE 802.3ad:
> If no LACPDU is received before the current_while timer expires again,
> the state machine transits to the DEFAULTED state. The record Default
> function overwrites the current operational parameters for the Partner
> with administratively configured values. This allows configuration of
> aggregations and individual links when no protocol partner is present,
> while still permitting an active partner to override default settings.
> The update_Default_Selected function sets the Selected variable FALSE
> if the Link Aggregation Group has changed. Since all operational parameters
> are now set to locally administered values there can be no disagreement as
> to the Link Aggregation Group, so the Matched variable is set TRUE.
>
> The relevant description is in the chapter 43.4.12 of the link below:
> https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=850426
>
> Signed-off-by: Weifeng Li <liweifeng2@huawei.com>
> ---
> v1 -> v2: adjust the formate of commit log
> ---
>   drivers/net/bonding/eth_bond_8023ad_private.h |  2 ++
>   drivers/net/bonding/rte_eth_bond_8023ad.c     | 21 +++++++++++++++++----
>   2 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/bonding/eth_bond_8023ad_private.h b/drivers/net/bonding/eth_bond_8023ad_private.h
> index 6e44ffd..76f8b8d 100644
> --- a/drivers/net/bonding/eth_bond_8023ad_private.h
> +++ b/drivers/net/bonding/eth_bond_8023ad_private.h
> @@ -50,6 +50,7 @@
>   #define SM_FLAGS_MOVED                      0x0100
>   #define SM_FLAGS_PARTNER_SHORT_TIMEOUT      0x0200
>   #define SM_FLAGS_NTT                        0x0400
> +#define SM_FLAGS_EXPIRED                    0x0800
>   
>   #define BOND_LINK_FULL_DUPLEX_KEY           0x01
>   #define BOND_LINK_SPEED_KEY_10M             0x02
> @@ -103,6 +104,7 @@ struct port {
>   
>   	/** The operational Partner's port parameters */
>   	struct port_params partner;
> +	struct port_params partner_admin;
Could you add some description about partner_admin here or in the commit 
log？
It would be better if there was decription from IEEE spec.

Thanks, Xavier
>   
>   	/* Additional port parameters not listed in documentation */
>   	/** State machine flags */
> diff --git a/drivers/net/bonding/rte_eth_bond_8023ad.c b/drivers/net/bonding/rte_eth_bond_8023ad.c
> index b77a37d..bfa418d 100644
> --- a/drivers/net/bonding/rte_eth_bond_8023ad.c
> +++ b/drivers/net/bonding/rte_eth_bond_8023ad.c
> @@ -356,16 +356,28 @@ rx_machine(struct bond_dev_private *internals, uint16_t slave_id,
>   
>   		timer_set(&port->current_while_timer, timeout);
>   		ACTOR_STATE_CLR(port, EXPIRED);
> +		SM_FLAG_CLR(port, EXPIRED);
>   		return; /* No state change */
>   	}
>   
>   	/* If CURRENT state timer is not running (stopped or expired)
>   	 * transit to EXPIRED state from DISABLED or CURRENT */
>   	if (!timer_is_running(&port->current_while_timer)) {
> -		ACTOR_STATE_SET(port, EXPIRED);
> -		PARTNER_STATE_CLR(port, SYNCHRONIZATION);
> -		PARTNER_STATE_SET(port, LACP_SHORT_TIMEOUT);
> -		timer_set(&port->current_while_timer, internals->mode4.short_timeout);
> +		if (SM_FLAG(port, EXPIRED)) {
> +			port->selected = UNSELECTED;
> +			memcpy(&port->partner, &port->partner_admin,
> +				sizeof(struct port_params));
> +			record_default(port);
> +			ACTOR_STATE_CLR(port, EXPIRED);
> +			timer_cancel(&port->current_while_timer);
> +		} else {
> +			SM_FLAG_SET(port, EXPIRED);
> +			ACTOR_STATE_SET(port, EXPIRED);
> +			PARTNER_STATE_CLR(port, SYNCHRONIZATION);
> +			PARTNER_STATE_SET(port, LACP_SHORT_TIMEOUT);
> +			timer_set(&port->current_while_timer,
> +				internals->mode4.short_timeout);
> +		}
>   	}
>   }
>   
> @@ -1020,6 +1032,7 @@ bond_mode_8023ad_activate_slave(struct rte_eth_dev *bond_dev,
>   	port->actor.port_number = rte_cpu_to_be_16(slave_id + 1);
>   
>   	memcpy(&port->partner, &initial, sizeof(struct port_params));
> +	memcpy(&port->partner_admin, &initial, sizeof(struct port_params));
>   
>   	/* default states */
>   	port->actor_state = STATE_AGGREGATION | STATE_LACP_ACTIVE | STATE_DEFAULTED;