[dpdk-dev] [PATCH] bus/fslmc: add support for scanned device count

[Shreyansh Jain]

FSLMC bus detects a multiple type of logical objects representing
components of the datapath.

Using the type of device, a newly introduced API
rte_fslmc_get_device_count can return the count of devices
scanned of that device type.

Signed-off-by: Shreyansh Jain <shreyansh.j...@nxp.com>
---
:: This patch is based on *net-next* tree.

 drivers/bus/fslmc/fslmc_bus.c               | 12 ++++++++++++
 drivers/bus/fslmc/rte_bus_fslmc_version.map |  1 +
 drivers/bus/fslmc/rte_fslmc.h               | 18 +++++++++++++++---
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/fslmc/fslmc_bus.c b/drivers/bus/fslmc/fslmc_bus.c
index 63c333a59..39478f7f3 100644
--- a/drivers/bus/fslmc/fslmc_bus.c
+++ b/drivers/bus/fslmc/fslmc_bus.c
@@ -53,6 +53,14 @@
 struct rte_fslmc_bus rte_fslmc_bus;
 uint8_t dpaa2_virt_mode;
 
+uint32_t
+rte_fslmc_get_device_count(enum rte_dpaa2_dev_type device_type)
+{
+       if (device_type > DPAA2_DEVTYPE_MAX)
+               return 0;
+       return rte_fslmc_bus.device_count[device_type];
+}
+
 static void
 cleanup_fslmc_device_list(void)
 {
@@ -164,6 +172,9 @@ scan_one_fslmc_device(char *dev_name)
        else
                dev->dev_type = DPAA2_UNKNOWN;
 
+       /* Update the device found into the device_count table */
+       rte_fslmc_bus.device_count[dev->dev_type]++;
+
        t_ptr = strtok(NULL, ".");
        if (!t_ptr) {
                FSLMC_BUS_LOG(ERR, "Incorrect device string observed (%s).",
@@ -408,6 +419,7 @@ struct rte_fslmc_bus rte_fslmc_bus = {
        },
        .device_list = TAILQ_HEAD_INITIALIZER(rte_fslmc_bus.device_list),
        .driver_list = TAILQ_HEAD_INITIALIZER(rte_fslmc_bus.driver_list),
+       .device_count = {0},
 };
 
 RTE_REGISTER_BUS(fslmc, rte_fslmc_bus.bus);
diff --git a/drivers/bus/fslmc/rte_bus_fslmc_version.map 
b/drivers/bus/fslmc/rte_bus_fslmc_version.map
index f59fc671f..16b759d8b 100644
--- a/drivers/bus/fslmc/rte_bus_fslmc_version.map
+++ b/drivers/bus/fslmc/rte_bus_fslmc_version.map
@@ -97,5 +97,6 @@ DPDK_18.02 {
        dpaa2_virt_mode;
        qbman_fq_query_state;
        qbman_fq_state_frame_count;
+       rte_fslmc_get_device_count;
 
 } DPDK_17.11;
diff --git a/drivers/bus/fslmc/rte_fslmc.h b/drivers/bus/fslmc/rte_fslmc.h
index fd52e2b84..e6314b5cb 100644
--- a/drivers/bus/fslmc/rte_fslmc.h
+++ b/drivers/bus/fslmc/rte_fslmc.h
@@ -88,7 +88,8 @@ enum rte_dpaa2_dev_type {
        DPAA2_CI,       /**< DPCI type device */
        DPAA2_MPORTAL,  /**< DPMCP type device */
        /* Unknown device placeholder */
-       DPAA2_UNKNOWN
+       DPAA2_UNKNOWN,
+       DPAA2_DEVTYPE_MAX,
 };
 
 TAILQ_HEAD(rte_dpaa2_object_list, rte_dpaa2_object);
@@ -150,8 +151,8 @@ struct rte_fslmc_bus {
                                /**< FSLMC DPAA2 Device list */
        struct rte_fslmc_driver_list driver_list;
                                /**< FSLMC DPAA2 Driver list */
-       int device_count;
-                               /**< Optional: Count of devices on bus */
+       int device_count[DPAA2_DEVTYPE_MAX];
+                               /**< Count of all devices scanned */
 };
 
 /**
@@ -191,6 +192,17 @@ RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
  */
 void rte_fslmc_object_register(struct rte_dpaa2_object *object);
 
+/**
+ * Count of a particular type of DPAA2 device scanned on the bus.
+ *
+ * @param dev_type
+ *   Type of device as rte_dpaa2_dev_type enumerator
+ * @return
+ *   >=0 for count; 0 indicates either no device of the said type scanned or
+ *   invalid device type.
+ */
+uint32_t rte_fslmc_get_device_count(enum rte_dpaa2_dev_type device_type);
+
 /** Helper for DPAA2 object registration */
 #define RTE_PMD_REGISTER_DPAA2_OBJECT(nm, dpaa2_obj) \
 RTE_INIT(dpaa2objinitfn_ ##nm); \
-- 
2.14.1