Re: [PATCH v2] net/ixgbe: ensure link status is updated

[Laurent Hardy <laurent.hardy@6wind.com>]

Hi Wei,
Thanks for your reply.

If autoneg is false, then we set a default speed to the highest value 
before performing the link setup.
You are right, there is no relevant reason to keep this check on speed 
mask.
should be:
+                       if (!autoneg)
+                               speed = IXGBE_LINK_SPEED_10GB_FULL;

Patch has been tested using testpmd with following setups:

Autoneg setup:
=========
- On dut, both ports of 82599 are connected to a switch with 1Gb ports
- auto-negotiate option is enabled on switch

Defined speed setup:
============
- set link speed to 1Gb on both ports of the switch connected to the dut


Test plan:
======
- set down ports on switch before starting testpmd on dut
- start testpmd, then set up ports on switch
- show port on dut through testpmd

without patch:
---------------------
testpmd> show port info 0

********************* Infos for port 0  *********************
MAC address: 00:1B:21:C7:3B:84
Driver name: net_ixgbe
Connect to socket: 0
memory allocation on the socket: 0
Link status: down
Link speed: 0 Mbps
Link duplex: half-duplex
Promiscuous mode: enabled
Allmulticast mode: disabled
Maximum number of MAC addresses: 127
Maximum number of MAC addresses of hash filtering: 4096
VLAN offload:
   strip on
   filter on
   qinq(extend) off
Hash key size in bytes: 40
Redirection table size: 128
Supported flow types:
   ipv4
   ipv4-tcp
   ipv4-udp
   ipv6
   ipv6-tcp
   ipv6-udp
   unknown
   unknown
   unknown
Max possible RX queues: 128
Max possible number of RXDs per queue: 4096
Min possible number of RXDs per queue: 32
RXDs number alignment: 8
Max possible TX queues: 64
Max possible number of TXDs per queue: 4096
Min possible number of TXDs per queue: 32
TXDs number alignment: 8


With patch:
---------------
testpmd> show port info 0

********************* Infos for port 0  *********************
MAC address: 00:1B:21:C7:3B:84
Driver name: net_ixgbe
Connect to socket: 0
memory allocation on the socket: 0
Link status: up
Link speed: 1000 Mbps
Link duplex: full-duplex
Promiscuous mode: enabled
Allmulticast mode: disabled
Maximum number of MAC addresses: 127
Maximum number of MAC addresses of hash filtering: 4096
VLAN offload:
   strip on
   filter on
   qinq(extend) off
Hash key size in bytes: 40
Redirection table size: 128
Supported flow types:
   ipv4
   ipv4-tcp
   ipv4-udp
   ipv6
   ipv6-tcp
   ipv6-udp
   unknown
   unknown
   unknown
Max possible RX queues: 128
Max possible number of RXDs per queue: 4096
Min possible number of RXDs per queue: 32
RXDs number alignment: 8
Max possible TX queues: 64
Max possible number of TXDs per queue: 4096
Min possible number of TXDs per queue: 32
TXDs number alignment: 8


Thanks & regards,
Laurent

On 03/30/2017 06:32 PM, Dai, Wei wrote:
> Hi, Olivier
>
> Has anyone already tested this patch ?
> Can you present some useful info on how to test it ?
> Can I use ethtool with some argument to downgrade or upgrade the rate of peer port ?
>
> I have just run testpmd with 82599, the hw->phy. autoneg_advertised is 0 after rte_eal_init() and rte_eth_dev_start().
> So I think the codes in if (!speed) { ... } is likely to be run.
> I agree with most of your codes.
> But why to limit speed of NIC to 10Gbps if autoneg is false and 10Gbps is supported ?
> In this case,  how about setting multiple speed ?
>
> Thanks
> -Wei
>
>
>> -----Original Message-----
>> From: Olivier Matz [mailto:olivier.matz@6wind.com]
>> Sent: Thursday, March 30, 2017 5:20 PM
>> To: dev@dpdk.org; Zhang, Helin <helin.zhang@intel.com>; Ananyev,
>> Konstantin <konstantin.ananyev@intel.com>; Dai, Wei <wei.dai@intel.com>
>> Cc: laurent.hardy@6wind.com
>> Subject: Re: [dpdk-dev] [PATCH v2] net/ixgbe: ensure link status is updated
>>
>> Hi,
>>
>> Can this patch be applied?
>>
>> Thanks,
>> Olivier
>>
>>
>> On Thu, 16 Feb 2017 17:32:01 +0100, Olivier Matz <olivier.matz@6wind.com>
>> wrote:
>>> From: Laurent Hardy <laurent.hardy@6wind.com>
>>>
>>> In case of fiber and link speed set to 1Gb at peer side (with autoneg
>>> or with defined speed), link status could be not properly updated at
>>> time cable is plugged-in.
>>> Indeed if cable was not plugged when device has been configured and
>>> started then link status will not be updated properly with new speed
>>> as no link setup will be triggered.
>>>
>>> To avoid this issue, IXGBE_FLAG_NEED_LINK_CONFIG is set to try a link
>>> setup each time link_update() is triggered and current link status is
>>> down. When cable is plugged-in, link setup will be performed via
>>> ixgbe_setup_link().
>>>
>>> Signed-off-by: Laurent Hardy <laurent.hardy@6wind.com>
>>> ---
>>>
>>> v1 -> v2:
>>> - rebase on top of head (change flag to 1<<4)
>>> - fix regression with copper links: only update link for fiber links
>>>
>>>   drivers/net/ixgbe/ixgbe_ethdev.c | 21 +++++++++++++++++++++
>>> drivers/net/ixgbe/ixgbe_ethdev.h |  1 +
>>>   2 files changed, 22 insertions(+)
>>>
>>> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
>>> b/drivers/net/ixgbe/ixgbe_ethdev.c
>>> index 0b89598..1114106 100644
>>> --- a/drivers/net/ixgbe/ixgbe_ethdev.c
>>> +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
>>> @@ -2357,6 +2357,7 @@ ixgbe_dev_configure(struct rte_eth_dev *dev)
>>>
>>>   	/* set flag to update link status after init */
>>>   	intr->flags |= IXGBE_FLAG_NEED_LINK_UPDATE;
>>> +	intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
>>>
>>>   	/*
>>>   	 * Initialize to TRUE. If any of Rx queues doesn't meet the bulk @@
>>> -3515,8 +3516,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int
>> wait_to_complete)
>>>   	struct ixgbe_hw *hw =
>> IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>>>   	struct rte_eth_link link, old;
>>>   	ixgbe_link_speed link_speed = IXGBE_LINK_SPEED_UNKNOWN;
>>> +	struct ixgbe_interrupt *intr =
>>> +		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
>>>   	int link_up;
>>>   	int diag;
>>> +	u32 speed = 0;
>>> +	bool autoneg = false;
>>>
>>>   	link.link_status = ETH_LINK_DOWN;
>>>   	link.link_speed = 0;
>>> @@ -3526,6 +3531,20 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev,
>>> int wait_to_complete)
>>>
>>>   	hw->mac.get_link_status = true;
>>>
>>> +	if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) &&
>>> +		hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber) {
>>> +		speed = hw->phy.autoneg_advertised;
>>> +		if (!speed) {
>>> +			ixgbe_get_link_capabilities(hw, &speed, &autoneg);
>>> +			/* setup the highest link when no autoneg */
>>> +			if (!autoneg) {
>>> +				if (speed & IXGBE_LINK_SPEED_10GB_FULL)
>>> +					speed = IXGBE_LINK_SPEED_10GB_FULL;
>>> +			}
>>> +		}
>>> +		ixgbe_setup_link(hw, speed, true);
>>> +	}
>>> +
>>>   	/* check if it needs to wait to complete, if lsc interrupt is enabled */
>>>   	if (wait_to_complete == 0 || dev->data->dev_conf.intr_conf.lsc != 0)
>>>   		diag = ixgbe_check_link(hw, &link_speed, &link_up, 0); @@ -3543,10
>>> +3562,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int
>>> wait_to_complete)
>>>
>>>   	if (link_up == 0) {
>>>   		rte_ixgbe_dev_atomic_write_link_status(dev, &link);
>>> +		intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
>>>   		if (link.link_status == old.link_status)
>>>   			return -1;
>>>   		return 0;
>>>   	}
>>> +	intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG;
>>>   	link.link_status = ETH_LINK_UP;
>>>   	link.link_duplex = ETH_LINK_FULL_DUPLEX;
>>>
>>> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h
>>> b/drivers/net/ixgbe/ixgbe_ethdev.h
>>> index aabbb00..bed4379 100644
>>> --- a/drivers/net/ixgbe/ixgbe_ethdev.h
>>> +++ b/drivers/net/ixgbe/ixgbe_ethdev.h
>>> @@ -45,6 +45,7 @@
>>>   #define IXGBE_FLAG_MAILBOX          (uint32_t)(1 << 1)
>>>   #define IXGBE_FLAG_PHY_INTERRUPT    (uint32_t)(1 << 2)
>>>   #define IXGBE_FLAG_MACSEC           (uint32_t)(1 << 3)
>>> +#define IXGBE_FLAG_NEED_LINK_CONFIG (uint32_t)(1 << 4)
>>>
>>>   /*
>>>    * Defines that were not part of ixgbe_type.h as they are not used by
>>> the