[dpdk-dev,v8,7/9] ethdev: add switch domain allocator

  Add switch domain allocate and free API to enable NET devices to synchronise
switch domain allocation.

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
---
 lib/librte_ether/rte_ethdev.c           | 54 +++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev_driver.h    | 39 ++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev_version.map |  2 ++
 3 files changed, 95 insertions(+)
  

> -----Original Message-----
> From: Doherty, Declan
> Sent: Thursday, April 26, 2018 11:41 AM
> To: dev@dpdk.org
> Cc: Adrien Mazarguil <adrien.mazarguil@6wind.com>; Yigit, Ferruh <ferruh.yigit@intel.com>; Thomas Monjalon <thomas@monjalon.net>;
> Shahaf Shuler <shahafs@mellanox.com>; Ananyev, Konstantin <konstantin.ananyev@intel.com>; Doherty, Declan
> <declan.doherty@intel.com>
> Subject: [dpdk-dev][PATCH v8 7/9] ethdev: add switch domain allocator
> 
> Add switch domain allocate and free API to enable NET devices to synchronise
> switch domain allocation.
> 
> Signed-off-by: Declan Doherty <declan.doherty@intel.com>
> ---
>  lib/librte_ether/rte_ethdev.c           | 54 +++++++++++++++++++++++++++++++++
>  lib/librte_ether/rte_ethdev_driver.h    | 39 ++++++++++++++++++++++++
>  lib/librte_ether/rte_ethdev_version.map |  2 ++
>  3 files changed, 95 insertions(+)
> 
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index cb85d8bb7..a09c7e5b3 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -4102,6 +4102,60 @@ rte_eth_dev_pool_ops_supported(uint16_t port_id, const char *pool)
>  	return (*dev->dev_ops->pool_ops_supported)(dev, pool);
>  }
> 
> +/**
> + * A set of values to describe the possible states of a switch domain.
> + */
> +enum rte_eth_switch_domain_state {
> +	RTE_ETH_SWITCH_DOMAIN_UNUSED = 0,
> +	RTE_ETH_SWITCH_DOMAIN_ALLOCATED
> +};
> +
> +/**
> + * Array of switch domains available for allocation. Array is sized to
> + * RTE_MAX_ETHPORTS elements as there cannot be more active switch domains than
> + * ethdev ports in a single process.
> + */

Question from previous version review:
Probably already discussed before, but  if we can't have more than one switch_id per port,
while we can't use port_id as switch_id?
Or switch_id can represent some other entity (not rte_ethdev)?
Konstantin

> +struct rte_eth_dev_switch {
> +	enum rte_eth_switch_domain_state state;
> +} rte_eth_switch_domains[RTE_MAX_ETHPORTS];
> +
> +int __rte_experimental
> +rte_eth_switch_domain_alloc(uint16_t *domain_id)
> +{
> +	unsigned int i;
> +
> +	*domain_id = RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID;
> +
> +	for (i = RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID + 1;
> +		i < RTE_MAX_ETHPORTS; i++) {
> +		if (rte_eth_switch_domains[i].state ==
> +			RTE_ETH_SWITCH_DOMAIN_UNUSED) {
> +			rte_eth_switch_domains[i].state =
> +				RTE_ETH_SWITCH_DOMAIN_ALLOCATED;
> +			*domain_id = i;
> +			return 0;
> +		}
> +	}
> +
> +	return -ENOSPC;
> +}
> +
> +int __rte_experimental
> +rte_eth_switch_domain_free(uint16_t domain_id)
> +{
> +	if (domain_id == RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID ||
> +		domain_id >= RTE_MAX_ETHPORTS)
> +		return -EINVAL;
> +
> +	if (rte_eth_switch_domains[domain_id].state !=
> +		RTE_ETH_SWITCH_DOMAIN_ALLOCATED)
> +		return -EINVAL;
> +
> +	rte_eth_switch_domains[domain_id].state = RTE_ETH_SWITCH_DOMAIN_UNUSED;
> +
> +	return 0;
> +}
> +
>  typedef int (*rte_eth_devargs_callback_t)(char *str, void *data);
> 
>  static int
> diff --git a/lib/librte_ether/rte_ethdev_driver.h b/lib/librte_ether/rte_ethdev_driver.h
> index 492da754a..f428afa72 100644
> --- a/lib/librte_ether/rte_ethdev_driver.h
> +++ b/lib/librte_ether/rte_ethdev_driver.h
> @@ -188,6 +188,45 @@ rte_eth_linkstatus_get(const struct rte_eth_dev *dev,
>  #endif
>  }
> 
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Allocate an unique switch domain identifier.
> + *
> + * A pool of switch domain identifiers which can be allocated on request. This
> + * will enabled devices which support the concept of switch domains to request
> + * a switch domain id which is guaranteed to be unique from other devices
> + * running in the same process.
> + *
> + * @param domain_id
> + *  switch domain identifier parameter to pass back to application
> + *
> + * @return
> + *   Negative errno value on error, 0 on success.
> + */
> +int __rte_experimental
> +rte_eth_switch_domain_alloc(uint16_t *domain_id);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Free switch domain.
> + *
> + * Return a switch domain identifier to the pool of free identifiers after it is
> + * no longer in use by device.
> + *
> + * @param domain_id
> + *  switch domain identifier to free
> + *
> + * @return
> + *   Negative errno value on error, 0 on success.
> + */
> +int __rte_experimental
> +rte_eth_switch_domain_free(uint16_t domain_id);
> +
> +
> 
>  /** Generic Ethernet device arguments  */
>  struct rte_eth_devargs {
> diff --git a/lib/librte_ether/rte_ethdev_version.map b/lib/librte_ether/rte_ethdev_version.map
> index 41c3d2699..86f06769a 100644
> --- a/lib/librte_ether/rte_ethdev_version.map
> +++ b/lib/librte_ether/rte_ethdev_version.map
> @@ -220,6 +220,8 @@ EXPERIMENTAL {
>  	rte_eth_dev_rx_offload_name;
>  	rte_eth_dev_tx_offload_name;
>  	rte_eth_find_next_owned_by;
> +	rte_eth_switch_domain_alloc;
> +	rte_eth_switch_domain_free;
>  	rte_mtr_capabilities_get;
>  	rte_mtr_create;
>  	rte_mtr_destroy;
> --
> 2.14.3