net/iavf: add devargs to enable watchdog

  This patch adds devargs to enable reset watchdog for iavf, use
'-a {pci:xxxx:xx:xx:x},watchdog_period={microseconds}' to enable watchdog.

If the watchdog period is configured through the IAVF_DEV_WATCHDOG_PERIOD
and devargs at the same time, the IAVF_DEV_WATCHDOG_PERIOD will prevail.

Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
---
 drivers/net/iavf/iavf.h        |  1 +
 drivers/net/iavf/iavf_ethdev.c | 54 ++++++++++++++++++++++++++++++++--
 drivers/net/iavf/iavf_vchnl.c  |  9 ++++--
 3 files changed, 58 insertions(+), 6 deletions(-)
  

> -----Original Message-----
> From: Zeng, ZhichaoX <zhichaox.zeng@intel.com>
> Sent: Tuesday, April 18, 2023 1:42 PM
> To: dev@dpdk.org
> Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; Zeng, ZhichaoX
> <zhichaox.zeng@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Xing,
> Beilei <beilei.xing@intel.com>
> Subject: [PATCH] net/iavf: add devargs to enable watchdog
> 
> This patch adds devargs to enable reset watchdog for iavf, use '-a
> {pci:xxxx:xx:xx:x},watchdog_period={microseconds}' to enable watchdog.
> 
> If the watchdog period is configured through the
> IAVF_DEV_WATCHDOG_PERIOD and devargs at the same time, the
> IAVF_DEV_WATCHDOG_PERIOD will prevail.

Is devargs prevail is more reasonable for user?

> 
> Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
> ---
>  drivers/net/iavf/iavf.h        |  1 +
>  drivers/net/iavf/iavf_ethdev.c | 54 ++++++++++++++++++++++++++++++++--
>  drivers/net/iavf/iavf_vchnl.c  |  9 ++++--
>  3 files changed, 58 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf.h b/drivers/net/iavf/iavf.h index
> aa18650ffa..fc0ce529ce 100644
> --- a/drivers/net/iavf/iavf.h
> +++ b/drivers/net/iavf/iavf.h
> @@ -304,6 +304,7 @@ struct iavf_devargs {
>  	uint8_t proto_xtr_dflt;
>  	uint8_t proto_xtr[IAVF_MAX_QUEUE_NUM];
>  	uint16_t quanta_size;
> +	uint32_t watchdog_period; /* microseconds */
>  };
> 
>  struct iavf_security_ctx;
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index f6d68403ce..f7c7ee3348 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -36,6 +36,7 @@
>  /* devargs */
>  #define IAVF_PROTO_XTR_ARG         "proto_xtr"
>  #define IAVF_QUANTA_SIZE_ARG       "quanta_size"
> +#define IAVF_RESET_WATCHDOG_ARG    "watchdog_period"
> 
>  uint64_t iavf_timestamp_dynflag;
>  int iavf_timestamp_dynfield_offset = -1; @@ -43,6 +44,7 @@ int
> iavf_timestamp_dynfield_offset = -1;  static const char * const
> iavf_valid_args[] = {
>  	IAVF_PROTO_XTR_ARG,
>  	IAVF_QUANTA_SIZE_ARG,
> +	IAVF_RESET_WATCHDOG_ARG,
>  	NULL
>  };
> 
> @@ -301,15 +303,23 @@ iavf_dev_watchdog(void *cb_arg)
> 
>  			/* enter reset state with VFLR event */
>  			adapter->vf.vf_reset = true;
> +			adapter->vf.link_up = false;
> 
>  			rte_eth_dev_callback_process(adapter->vf.eth_dev,
>  				RTE_ETH_EVENT_INTR_RESET, NULL);
>  		}
>  	}
> 
> +#if (IAVF_DEV_WATCHDOG_PERIOD > 0)
>  	/* re-alarm watchdog */
>  	rc = rte_eal_alarm_set(IAVF_DEV_WATCHDOG_PERIOD,
>  			&iavf_dev_watchdog, cb_arg);
> +#else
> +	/* re-alarm watchdog by devargs */
> +	if (adapter->devargs.watchdog_period)
> +		rc = rte_eal_alarm_set(adapter->devargs.watchdog_period,
> +				&iavf_dev_watchdog, cb_arg);
> +#endif
> 
>  	if (rc)
>  		PMD_DRV_LOG(ERR, "Failed \"%s\" to reset device watchdog
> alarm", @@ -317,23 +327,37 @@ iavf_dev_watchdog(void *cb_arg)  }
> 
>  static void
> -iavf_dev_watchdog_enable(struct iavf_adapter *adapter __rte_unused)
> +iavf_dev_watchdog_enable(struct iavf_adapter *adapter)
>  {
>  #if (IAVF_DEV_WATCHDOG_PERIOD > 0)
> -	PMD_DRV_LOG(INFO, "Enabling device watchdog");
> +	PMD_DRV_LOG(INFO, "Enabling device watchdog, macro: %dμs",
> +IAVF_DEV_WATCHDOG_PERIOD);
>  	adapter->vf.watchdog_enabled = true;
>  	if (rte_eal_alarm_set(IAVF_DEV_WATCHDOG_PERIOD,
>  			&iavf_dev_watchdog, (void *)adapter))
>  		PMD_DRV_LOG(ERR, "Failed to enabled device watchdog");
> +#else
> +	if (adapter->devargs.watchdog_period) {
> +		PMD_DRV_LOG(INFO, "Enabling device watchdog,
> devargs: %dμs",
> +				adapter->devargs.watchdog_period);
> +		adapter->vf.watchdog_enabled = true;
> +		if (rte_eal_alarm_set(adapter->devargs.watchdog_period,
> +				&iavf_dev_watchdog, (void *)adapter))
> +			PMD_DRV_LOG(ERR, "Failed to enabled device
> watchdog");
> +	}
>  #endif
>  }
> 
>  static void
> -iavf_dev_watchdog_disable(struct iavf_adapter *adapter __rte_unused)
> +iavf_dev_watchdog_disable(struct iavf_adapter *adapter)
>  {
>  #if (IAVF_DEV_WATCHDOG_PERIOD > 0)
>  	PMD_DRV_LOG(INFO, "Disabling device watchdog");
>  	adapter->vf.watchdog_enabled = false;
> +#else
> +	if (adapter->devargs.watchdog_period) {
> +		PMD_DRV_LOG(INFO, "Disabling device watchdog");
> +		adapter->vf.watchdog_enabled = false;
> +	}
>  #endif
>  }
> 
> @@ -2201,6 +2225,25 @@ parse_u16(__rte_unused const char *key, const
> char *value, void *args)
>  	return 0;
>  }
> 
> +static int
> +iavf_parse_watchdog_period(__rte_unused const char *key, const char
> +*value, void *args) {
> +	u32 *num = (u32 *)args;
> +	u32 tmp;
> +
> +	errno = 0;
> +	tmp = strtoul(value, NULL, 10);
> +	if (errno || !tmp) {
> +		PMD_DRV_LOG(WARNING, "%s: \"%s\" is not a valid u32",
> +				key, value);
> +		return -1;
> +	}
> +
> +	*num = tmp;
> +
> +	return 0;
> +}
> +
>  static int iavf_parse_devargs(struct rte_eth_dev *dev)  {
>  	struct iavf_adapter *ad =
> @@ -2232,6 +2275,11 @@ static int iavf_parse_devargs(struct rte_eth_dev
> *dev)
>  	if (ret)
>  		goto bail;
> 
> +	ret = rte_kvargs_process(kvlist, IAVF_RESET_WATCHDOG_ARG,
> +				 &iavf_parse_watchdog_period, &ad-
> >devargs.watchdog_period);
> +	if (ret)
> +		goto bail;
> +
>  	if (ad->devargs.quanta_size != 0 &&
>  	    (ad->devargs.quanta_size < 256 || ad->devargs.quanta_size > 4096
> ||
>  	     ad->devargs.quanta_size & 0x40)) { diff --git
> a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c index
> 9adaadb173..402261ba9c 100644
> --- a/drivers/net/iavf/iavf_vchnl.c
> +++ b/drivers/net/iavf/iavf_vchnl.c
> @@ -433,9 +433,12 @@ iavf_handle_pf_event_msg(struct rte_eth_dev *dev,
> uint8_t *msg,
>  	switch (pf_msg->event) {
>  	case VIRTCHNL_EVENT_RESET_IMPENDING:
>  		PMD_DRV_LOG(DEBUG,
> "VIRTCHNL_EVENT_RESET_IMPENDING event");
> -		vf->vf_reset = true;
> -		iavf_dev_event_post(dev, RTE_ETH_EVENT_INTR_RESET,
> -					      NULL, 0);
> +		vf->link_up = false;
> +		if (!vf->vf_reset) {
> +			vf->vf_reset = true;
> +			iavf_dev_event_post(dev,
> RTE_ETH_EVENT_INTR_RESET,
> +				NULL, 0);
> +		}
>  		break;
>  	case VIRTCHNL_EVENT_LINK_CHANGE:
>  		PMD_DRV_LOG(DEBUG, "VIRTCHNL_EVENT_LINK_CHANGE
> event");
> --
> 2.25.1