Re: [dpdk-dev] [V5 1/3] ethdev: introduce FEC API

["humin (Connor)" <humin29@huawei.com>]

在 2020/9/17 20:49, Ananyev, Konstantin 写道:
> 
>>
>> This patch adds Forward error correction(FEC) support for ethdev.
>> Introduce APIs which support query and config FEC information in
>> hardware.
>>
>> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
>> Reviewed-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>> Reviewed-by: Chengwen Feng <fengchengwen@huawei.com>
>> Reviewed-by: Chengchang Tang <tangchengchang@huawei.com>
>> ---
>> v4->v5:
>> Modifies FEC capa definitions using macros.
>> Add RTE_ prefix for public FEC mode enum.
>> add release notes about FEC for dpdk20_11.
>>
>> ---
>> v2->v3:
>> add function return value "-ENOTSUP" for API
>>
>> ---
>>   doc/guides/rel_notes/release_20_11.rst   | 13 +++++
>>   lib/librte_ethdev/rte_ethdev.c           | 50 +++++++++++++++++++
>>   lib/librte_ethdev/rte_ethdev.h           | 83 ++++++++++++++++++++++++++++++++
>>   lib/librte_ethdev/rte_ethdev_core.h      | 77 +++++++++++++++++++++++++++++
>>   lib/librte_ethdev/rte_ethdev_version.map |  5 ++
>>   5 files changed, 228 insertions(+)
>>
>> diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst
>> index cc72609..e4f0587 100644
>> --- a/doc/guides/rel_notes/release_20_11.rst
>> +++ b/doc/guides/rel_notes/release_20_11.rst
>> @@ -55,6 +55,19 @@ New Features
>>        Also, make sure to start the actual text at the margin.
>>        =======================================================
>>
>> +* **Added the FEC Library, a generic FEC query and config library.**
>> +
>> +  Added the FEC library which provides an API for query FEC capabilities and
>> +  FEC mode from device. Also, API for configuring FEC mode is also provided.
>> +
>> +  Added hns3 FEC PMD, for supporting query and config FEC mode.
>> +
>> +* **Updated testpmd with a command for FEC.**
>> +
>> +  Added a FEC command to testpmd app,
>> +  ``show port <port_id> fec capabilities`` which queries FEC capabilities device supports.
>> +  ``show port <port_id> fec_mode`` which queries FEC mode from device.
>> +  ``set port <port_id> fec_mode <auto|off|rs|baser>`` which configures FEC mode to device.
>>
>>   Removed Items
>>   -------------
>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
>> index 7858ad5..fde77c1 100644
>> --- a/lib/librte_ethdev/rte_ethdev.c
>> +++ b/lib/librte_ethdev/rte_ethdev.c
>> @@ -3642,6 +3642,56 @@ rte_eth_led_off(uint16_t port_id)
>>   	return eth_err(port_id, (*dev->dev_ops->dev_led_off)(dev));
>>   }
>>
>> +int
>> +rte_eth_fec_get_capability(uint16_t port_id, uint32_t *fec_cap)
>> +{
>> +	struct rte_eth_dev *dev;
>> +
>> +	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
>> +	dev = &rte_eth_devices[port_id];
>> +	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_get_capability, -ENOTSUP);
>> +	return eth_err(port_id, (*dev->dev_ops->fec_get_capability)(dev,
>> +								fec_cap));
>> +}
>> +
>> +int
>> +rte_eth_fec_get(uint16_t port_id, enum rte_fec_mode *mode)
>> +{
>> +	struct rte_eth_dev *dev;
>> +
>> +	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
>> +	dev = &rte_eth_devices[port_id];
>> +	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_get, -ENOTSUP);
>> +	return eth_err(port_id, (*dev->dev_ops->fec_get)(dev, mode));
>> +}
>> +
>> +int
>> +rte_eth_fec_set(uint16_t port_id, enum rte_fec_mode mode)
>> +{
>> +	struct rte_eth_dev *dev;
>> +	uint32_t fec_mode_mask;
>> +	int ret;
>> +
>> +	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
>> +
>> +	ret = rte_eth_fec_get_capability(port_id, &fec_mode_mask);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/*
>> +	 * Check whether the configured mode is within the FEC capability.
>> +	 * If not, the configured mode will not be supported.
>> +	 */
>> +	if (!(fec_mode_mask & (1U << (uint32_t)mode))) {
>> +		RTE_ETHDEV_LOG(ERR, "unsupported fec mode=%d\n", mode);
>> +		return -EINVAL;
>> +	}
>> +
>> +	dev = &rte_eth_devices[port_id];
>> +	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->fec_set, -ENOTSUP);
>> +	return eth_err(port_id, (*dev->dev_ops->fec_set)(dev, mode));
>> +}
>> +
>>   /*
>>    * Returns index into MAC address array of addr. Use 00:00:00:00:00:00 to find
>>    * an empty spot.
>> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
>> index 70295d7..aa79326 100644
>> --- a/lib/librte_ethdev/rte_ethdev.h
>> +++ b/lib/librte_ethdev/rte_ethdev.h
>> @@ -1511,6 +1511,25 @@ struct rte_eth_dcb_info {
>>   	struct rte_eth_dcb_tc_queue_mapping tc_queue;
>>   };
>>
>> +/**
>> + * This enum indicates the possible (forward error correction)FEC modes
>> + * of an ethdev port.
>> + */
>> +enum rte_fec_mode {
>> +	RTE_ETH_FEC_NOFEC = 0,      /**< FEC is off */
>> +	RTE_ETH_FEC_BASER,          /**< FEC using common algorithm */
>> +	RTE_ETH_FEC_RS,             /**< FEC using RS algorithm */
>> +	RTE_ETH_FEC_AUTO,           /**< FEC autonegotiation modes */
>> +	RTE_ETH_FEC_NUM
> 
> It is better not to have RTE_ETH_FEC_NUM here:
> Any future additions to that enum would overwrite _NUM values and would
> considered as ABI breakage.
> Aprart from that:
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> 
HI,
       it does not matter even though RTE_ETH_FEC_NUM value is changed 
when adding new element to that enum. RTE_ETH_FEC_NUM is used as the MAX 
vlaue of FEC modes, not one FEC mode itself.
       One of the application scenarios is as follows,set "testpmd" as 
an example:
show_fec_capability(uint32_t fec_cap)
{
	uint32_t i;

	if (fec_cap == 0) {
		printf("FEC is not supported\n");
		return;
	}

	printf("FEC capabilities: ");
	for (i = RTE_ETH_FEC_BASER; i < RTE_ETH_FEC_NUM; i++) {
		if (fec_cap & 1U << i)
			printf("%s ", fec_mode_name[i].name);
	}
	printf("\n");
}

Hope for your reply.

>> +};
>> +
>> +/* This indicates FEC capabilities */
>> +#define RTE_ETH_FEC_CAPA_NOFEC  (1U << RTE_ETH_FEC_NOFEC)
>> +#define RTE_ETH_FEC_CAPA_BASER  (1U << RTE_ETH_FEC_BASER)
>> +#define RTE_ETH_FEC_CAPA_RS     (1U << RTE_ETH_FEC_RS)
>> +#define RTE_ETH_FEC_CAPA_AUTO   (1U << RTE_ETH_FEC_AUTO)
>> +
>> +
>>   #define RTE_ETH_ALL RTE_MAX_ETHPORTS
>>
>>   /* Macros to check for valid port */
>> @@ -3328,6 +3347,70 @@ int  rte_eth_led_on(uint16_t port_id);
>>   int  rte_eth_led_off(uint16_t port_id);
>>
>>   /**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
>> + *
>> + * Get Forward Error Correction(FEC) capability.
>> + *
>> + * @param port_id
>> + *   The port identifier of the Ethernet device.
>> + * @param fec_cap
>> + *   returns the FEC capability from the device, as follows:
>> + *   RTE_ETH_FEC_CAPA_NOFEC
>> + *   RTE_ETH_FEC_CAPA_BASER
>> + *   RTE_ETH_FEC_CAPA_RS
>> + *   RTE_ETH_FEC_CAPA_AUTO
>> + * @return
>> + *   - (0) if successful.
>> + *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
>> + *     that operation.
>> + *   - (-EIO) if device is removed.
>> + *   - (-ENODEV)  if *port_id* invalid.
>> + */
>> +__rte_experimental
>> +int rte_eth_fec_get_capability(uint16_t port_id, uint32_t *fec_cap);
>> +
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
>> + *
>> + * Get current Forward Error Correction(FEC) mode.
>> + *
>> + * @param port_id
>> + *   The port identifier of the Ethernet device.
>> + * @param mode
>> + *   returns the FEC mode from the device.
>> + * @return
>> + *   - (0) if successful.
>> + *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
>> + *     that operation.
>> + *   - (-EIO) if device is removed.
>> + *   - (-ENODEV)  if *port_id* invalid.
>> + */
>> +__rte_experimental
>> +int rte_eth_fec_get(uint16_t port_id, enum rte_fec_mode *mode);
>> +
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
>> + *
>> + * Set Forward Error Correction(FEC) mode.
>> + *
>> + * @param port_id
>> + *   The port identifier of the Ethernet device.
>> + * @param mode
>> + *   the FEC mode.
>> + * @return
>> + *   - (0) if successful.
>> + *   - (-EINVAL) if the FEC mode is not valid.
>> + *   - (-ENOTSUP) if underlying hardware OR driver doesn't support.
>> + *   - (-EIO) if device is removed.
>> + *   - (-ENODEV)  if *port_id* invalid.
>> + */
>> +__rte_experimental
>> +int rte_eth_fec_set(uint16_t port_id, enum rte_fec_mode mode);
>> +
>> +/**
>>    * Get current status of the Ethernet link flow control for Ethernet device
>>    *
>>    * @param port_id
>> diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
>> index 32407dd..cd1acf1 100644
>> --- a/lib/librte_ethdev/rte_ethdev_core.h
>> +++ b/lib/librte_ethdev/rte_ethdev_core.h
>> @@ -604,6 +604,76 @@ typedef int (*eth_tx_hairpin_queue_setup_t)
>>   	 const struct rte_eth_hairpin_conf *hairpin_conf);
>>
>>   /**
>> + * @internal
>> + * Get Forward Error Correction(FEC) capability.
>> + *
>> + * @param dev
>> + *   ethdev handle of port.
>> + * @param fec_cap
>> + *   returns the FEC capability from the device.
>> + *
>> + * @return
>> + *   Negative errno value on error, 0 on success.
>> + *
>> + * @retval 0
>> + *   Success, get FEC success.
>> + * @retval -ENOTSUP
>> + *   operation is not supported.
>> + * @retval -EIO
>> + *   device is removed.
>> + * @retval -ENODEV
>> + *   Device is gone.
>> + */
>> +typedef int (*eth_fec_get_capability_t)(struct rte_eth_dev *dev,
>> +					uint32_t *fec_cap);
>> +
>> +/**
>> + * @internal
>> + * Get Forward Error Correction(FEC) mode.
>> + *
>> + * @param dev
>> + *   ethdev handle of port.
>> + * @param mode
>> + *   returns the FEC mode from the device.
>> + *
>> + * @return
>> + *   Negative errno value on error, 0 on success.
>> + *
>> + * @retval 0
>> + *   Success, get FEC success.
>> + * @retval -ENOTSUP
>> + *   operation is not supported.
>> + * @retval -EIO
>> + *   device is removed.
>> + * @retval -ENODEV
>> + *   Device is gone.
>> + */
>> +typedef int (*eth_fec_get_t)(struct rte_eth_dev *dev, enum rte_fec_mode *mode);
>> +
>> +/**
>> + * @internal
>> + *   Set Forward Error Correction(FEC) mode.
>> + *
>> + * @param dev
>> + *   ethdev handle of port.
>> + * @param mode
>> + *   the FEC mode.
>> + *
>> + * @return
>> + *   Negative errno value on error, 0 on success.
>> + *
>> + * @retval 0
>> + *   Success, set FEC success.
>> + * @retval -ENOTSUP
>> + *   operation is not supported.
>> + * @retval -EIO
>> + *   device is removed.
>> + * @retval -ENODEV
>> + *   Device is gone.
>> + */
>> +typedef int (*eth_fec_set_t)(struct rte_eth_dev *dev, enum rte_fec_mode mode);
>> +
>> +/**
>>    * @internal A structure containing the functions exported by an Ethernet driver.
>>    */
>>   struct eth_dev_ops {
>> @@ -752,6 +822,13 @@ struct eth_dev_ops {
>>   	/**< Set up device RX hairpin queue. */
>>   	eth_tx_hairpin_queue_setup_t tx_hairpin_queue_setup;
>>   	/**< Set up device TX hairpin queue. */
>> +
>> +	eth_fec_get_capability_t fec_get_capability;
>> +	/**< Get Forward Error Correction(FEC) capability; */
>> +	eth_fec_get_t fec_get;
>> +	/**< Get Forward Error Correction(FEC) mode; */
>> +	eth_fec_set_t fec_set;
>> +	/**< Set Forward Error Correction(FEC) mode; */
>>   };
>>
>>   /**
>> diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
>> index 02081d9..9f3fb8f 100644
>> --- a/lib/librte_ethdev/rte_ethdev_version.map
>> +++ b/lib/librte_ethdev/rte_ethdev_version.map
>> @@ -239,6 +239,11 @@ EXPERIMENTAL {
>>   	__rte_ethdev_trace_rx_burst;
>>   	__rte_ethdev_trace_tx_burst;
>>   	rte_flow_get_aged_flows;
>> +
>> +	# added in 20.11
>> +	rte_eth_fec_get_capability;
>> +	rte_eth_fec_get;
>> +	rte_eth_fec_set;
>>   };
>>
>>   INTERNAL {
>> --
>> 2.7.4
> 
> .
>