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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Wei Hu (Xavier)" <xavier.huwei@tom.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 2/9] net/hns3: get link state change through mailbox
Date: Tue, 3 Dec 2019 13:16:27 +0000
Message-ID: <01debb84-b7de-e9fa-10f0-7fbf85dddc17@intel.com> (raw)
In-Reply-To: <20191202025126.73423-3-xavier.huwei@tom.com>

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asked for the link status, it can be outdated regarding the status of the timers.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fixes the problem above that user is getting out of date link status.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


> 
> 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
> 


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02  2:51 [dpdk-dev] [PATCH 0/9] updates for hns3 PMD driver Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 1/9] net/hns3: support Rx interrupt Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 2/9] net/hns3: get link state change through mailbox Wei Hu (Xavier)
2019-12-03 13:16   ` Ferruh Yigit [this message]
2019-12-03 13:19     ` Ferruh Yigit
2019-12-14 10:12       ` Wei Hu (Xavier)
2019-12-14 10:26     ` Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 3/9] net/hns3: modify the return value of enable msix Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 4/9] net/hns3: modify custom macro Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 5/9] net/hns3: optimize RSS's default algorithm Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 6/9] net/hns3: remove the redundant function call Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 7/9] net/hns3: remove the redundant variable initialization Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 8/9] net/hns3: remove the unnecessary assignment Wei Hu (Xavier)
2019-12-02  2:51 ` [dpdk-dev] [PATCH 9/9] net/hns3: remove the unused macros Wei Hu (Xavier)
  -- strict thread matches above, loose matches on Subject: below --
2019-11-30 10:58 [dpdk-dev] [PATCH 0/9] updates for hns3 PMD driver Wei Hu (Xavier)
2019-11-30 10:58 ` [dpdk-dev] [PATCH 2/9] net/hns3: get link state change through mailbox Wei Hu (Xavier)

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