Re: [dpdk-dev] [PATCH v2] net/bonding: change the state machine to defaulted

["Wei Hu (Xavier)" <xavier.huwei@huawei.com>]

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;