[dpdk-dev] [PATCH v7 7/9] ethdev: add switch domain allocator

[Declan Doherty <declan.doherty@intel.com>]

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
---
 lib/librte_ether/rte_ethdev.c           | 53 +++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev_driver.h    | 39 ++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev_version.map |  3 ++
 3 files changed, 95 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index a082b211c..d1f95161f 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -4300,6 +4300,59 @@ rte_eth_devargs_parse_ports(char *str, void *data)
 		&eth_da->nb_ports, RTE_MAX_ETHPORTS);
 }
 
+/**
+ * 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.
+ */
+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;
+}
 
 static int
 rte_eth_devargs_parse_representor_ports(char *str, void *data)
diff --git a/lib/librte_ether/rte_ethdev_driver.h b/lib/librte_ether/rte_ethdev_driver.h
index 3bce5747d..c22fcbde1 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 62ecbdb8a..6601ef106 100644
--- a/lib/librte_ether/rte_ethdev_version.map
+++ b/lib/librte_ether/rte_ethdev_version.map
@@ -236,5 +236,8 @@ EXPERIMENTAL {
 	rt_eth_devargs_parse;
 	rte_eth_dev_create;
 	rte_eth_dev_destroy;
+	rte_eth_switch_domain_alloc;
+	rte_eth_switch_domain_free;
+	rte_eth_switch_domains;
 
 } DPDK_18.05;
-- 
2.14.3