Re: [dpdk-dev] [PATCH 2/9] net/hns3: get link state change through mailbox

["Wei Hu (Xavier)" <huwei013@chinasoftinc.com>]

Hi, Ferruh Yigit

On 2019/12/3 21:19, Ferruh Yigit wrote:
> On 12/3/2019 1:16 PM, Ferruh Yigit wrote:
>> On 12/2/2019 2:51 AM, Wei Hu (Xavier) wrote:
>>> From: Hongbo Zheng <zhenghongbo3@huawei.com>
>>>
>>> When link down occurs, firmware adds the function of sending message
>>> to PF driver through mailbox, hns3 PMD driver can recognize link state
>>> change faster through the message.
>>
>> Hi Xavier,
>>
>> As far as I can see the 'link_update' dev_ops (hns3_dev_link_update()), is just
>> copying data from internal structure to "struct rte_eth_link". And you have
>> timers set to regularly (ever second?) update the internal structure for link
>> status.
>>
>> Instead, unless you are not using or need those status internally, you can pull
>> the internal link status in the 'hns3_dev_link_update()', this way it can be
>> possible to get rid of the timers. Also in current implementation, when used
>> asked for the link status, it can be outdated regarding the status of the timers.
>>
>>
>> In this patch, interrupt seems used to update the internal link status, this
>> fixes the problem above that user is getting out of date link status. But
>> instead of this, what do you think updating "struct rte_eth_link" too in the
>> interrupt handler and advertising 'RTE_ETH_DEV_INTR_LSC' capability ("Link
>> status event" feature in .ini file), so user can enable the lsc interrupt
>> ('dev_conf.intr_conf.lsc') and gets the link status quicker because of the
>> support in the API ('rte_eth_link_get')?
>>
>> Thanks,
>> ferruh
> 
> 'Wei Hu (Xavier) <xavier.huwei@tom.com>' email address is failing, not sure what
> it is, adding the @huawei.com addresses.
> 
Sorry, there is something wrong for the email service: 
xavier.huwei@tom.com,
Now I use the current mailbox that can provide relatively stable 
services as an alternative.

Thanks,
Xavier
>>
>>
>>>
>>> Signed-off-by: Hongbo Zheng <zhenghongbo3@huawei.com>
>>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>>> ---
>>>   drivers/net/hns3/hns3_ethdev.c |  8 ++++++--
>>>   drivers/net/hns3/hns3_ethdev.h |  1 +
>>>   drivers/net/hns3/hns3_mbx.c    | 37 ++++++++++++++++++++++++++++++++++
>>>   drivers/net/hns3/hns3_mbx.h    |  8 ++++++++
>>>   4 files changed, 52 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
>>> index bf0ab458f..3c591be51 100644
>>> --- a/drivers/net/hns3/hns3_ethdev.c
>>> +++ b/drivers/net/hns3/hns3_ethdev.c
>>> @@ -218,6 +218,8 @@ hns3_interrupt_handler(void *param)
>>>   		hns3_schedule_reset(hns);
>>>   	} else if (event_cause == HNS3_VECTOR0_EVENT_RST)
>>>   		hns3_schedule_reset(hns);
>>> +	else if (event_cause == HNS3_VECTOR0_EVENT_MBX)
>>> +		hns3_dev_handle_mbx_msg(hw);
>>>   	else
>>>   		hns3_err(hw, "Received unknown event");
>>>   
>>> @@ -3806,14 +3808,16 @@ hns3_get_mac_link_status(struct hns3_hw *hw)
>>>   	return !!link_status;
>>>   }
>>>   
>>> -static void
>>> +void
>>>   hns3_update_link_status(struct hns3_hw *hw)
>>>   {
>>>   	int state;
>>>   
>>>   	state = hns3_get_mac_link_status(hw);
>>> -	if (state != hw->mac.link_status)
>>> +	if (state != hw->mac.link_status) {
>>>   		hw->mac.link_status = state;
>>> +		hns3_warn(hw, "Link status change to %s!", state ? "up" : "down");
>>> +	}
>>>   }
>>>   
>>>   static void
>>> diff --git a/drivers/net/hns3/hns3_ethdev.h b/drivers/net/hns3/hns3_ethdev.h
>>> index e9a3fe410..004cd75a9 100644
>>> --- a/drivers/net/hns3/hns3_ethdev.h
>>> +++ b/drivers/net/hns3/hns3_ethdev.h
>>> @@ -631,6 +631,7 @@ int hns3_dev_filter_ctrl(struct rte_eth_dev *dev,
>>>   			 enum rte_filter_op filter_op, void *arg);
>>>   bool hns3_is_reset_pending(struct hns3_adapter *hns);
>>>   bool hns3vf_is_reset_pending(struct hns3_adapter *hns);
>>> +void hns3_update_link_status(struct hns3_hw *hw);
>>>   
>>>   static inline bool
>>>   is_reset_pending(struct hns3_adapter *hns)
>>> diff --git a/drivers/net/hns3/hns3_mbx.c b/drivers/net/hns3/hns3_mbx.c
>>> index c1647af4b..26807bc4b 100644
>>> --- a/drivers/net/hns3/hns3_mbx.c
>>> +++ b/drivers/net/hns3/hns3_mbx.c
>>> @@ -282,6 +282,40 @@ hns3_update_resp_position(struct hns3_hw *hw, uint32_t resp_msg)
>>>   	resp->tail = tail;
>>>   }
>>>   
>>> +static void
>>> +hns3_link_fail_parse(struct hns3_hw *hw, uint8_t link_fail_code)
>>> +{
>>> +	switch (link_fail_code) {
>>> +	case HNS3_MBX_LF_NORMAL:
>>> +		break;
>>> +	case HNS3_MBX_LF_REF_CLOCK_LOST:
>>> +		hns3_warn(hw, "Reference clock lost!");
>>> +		break;
>>> +	case HNS3_MBX_LF_XSFP_TX_DISABLE:
>>> +		hns3_warn(hw, "SFP tx is disabled!");
>>> +		break;
>>> +	case HNS3_MBX_LF_XSFP_ABSENT:
>>> +		hns3_warn(hw, "SFP is absent!");
>>> +		break;
>>> +	default:
>>> +		hns3_warn(hw, "Unknown fail code:%u!", link_fail_code);
>>> +		break;
>>> +	}
>>> +}
>>> +
>>> +static void
>>> +hns3_handle_link_change_event(struct hns3_hw *hw,
>>> +			      struct hns3_mbx_pf_to_vf_cmd *req)
>>> +{
>>> +#define LINK_STATUS_OFFSET     1
>>> +#define LINK_FAIL_CODE_OFFSET  2
>>> +
>>> +	if (!req->msg[LINK_STATUS_OFFSET])
>>> +		hns3_link_fail_parse(hw, req->msg[LINK_FAIL_CODE_OFFSET]);
>>> +
>>> +	hns3_update_link_status(hw);
>>> +}
>>> +
>>>   void
>>>   hns3_dev_handle_mbx_msg(struct hns3_hw *hw)
>>>   {
>>> @@ -335,6 +369,9 @@ hns3_dev_handle_mbx_msg(struct hns3_hw *hw)
>>>   
>>>   			hns3_mbx_handler(hw);
>>>   			break;
>>> +		case HNS3_MBX_PUSH_LINK_STATUS:
>>> +			hns3_handle_link_change_event(hw, req);
>>> +			break;
>>>   		default:
>>>   			hns3_err(hw,
>>>   				 "VF received unsupported(%d) mbx msg from PF",
>>> diff --git a/drivers/net/hns3/hns3_mbx.h b/drivers/net/hns3/hns3_mbx.h
>>> index d1a6bfead..3722c8760 100644
>>> --- a/drivers/net/hns3/hns3_mbx.h
>>> +++ b/drivers/net/hns3/hns3_mbx.h
>>> @@ -41,6 +41,7 @@ enum HNS3_MBX_OPCODE {
>>>   	HNS3_MBX_GET_QID_IN_PF,         /* (VF -> PF) get queue id in pf */
>>>   
>>>   	HNS3_MBX_HANDLE_VF_TBL = 38,    /* (VF -> PF) store/clear hw cfg tbl */
>>> +	HNS3_MBX_PUSH_LINK_STATUS = 201, /* (IMP -> PF) get port link status */
>>>   };
>>>   
>>>   /* below are per-VF mac-vlan subcodes */
>>> @@ -64,6 +65,13 @@ enum hns3_mbx_tbl_cfg_subcode {
>>>   	HNS3_MBX_VPORT_LIST_CLEAR = 0,
>>>   };
>>>   
>>> +enum hns3_mbx_link_fail_subcode {
>>> +	HNS3_MBX_LF_NORMAL = 0,
>>> +	HNS3_MBX_LF_REF_CLOCK_LOST,
>>> +	HNS3_MBX_LF_XSFP_TX_DISABLE,
>>> +	HNS3_MBX_LF_XSFP_ABSENT,
>>> +};
>>> +
>>>   #define HNS3_MBX_MAX_MSG_SIZE	16
>>>   #define HNS3_MBX_MAX_RESP_DATA_SIZE	8
>>>   #define HNS3_MBX_RING_MAP_BASIC_MSG_NUM	3
>>>
>>