[dpdk-dev] [PATCH v4 2/9] bus: add device iterator

[Gaetan Rivet <gaetan.rivet@6wind.com>]

From: Jan Blunck <jblunck@infradead.org>

Signed-off-by: Jan Blunck <jblunck@infradead.org>
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_eal/common/include/rte_bus.h |  7 +++++++
 lib/librte_eal/common/include/rte_dev.h | 17 +++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 3e26d4b..fe9573f 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -82,6 +82,12 @@ typedef int (*rte_bus_scan_t)(void);
 typedef int (*rte_bus_probe_t)(void);
 
 /**
+ * Device iterator to find a particular device on a bus.
+ */
+typedef struct rte_device * (*rte_bus_find_device_t)(rte_dev_cmp_t match,
+						     const void *data);
+
+/**
  * A structure describing a generic bus.
  */
 struct rte_bus {
@@ -89,6 +95,7 @@ struct rte_bus {
 	const char *name;            /**< Name of the bus */
 	rte_bus_scan_t scan;         /**< Scan for devices attached to bus */
 	rte_bus_probe_t probe;       /**< Probe devices on bus */
+	rte_bus_find_device_t find_device; /**< Find device on bus */
 };
 
 /**
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index de20c06..724855e 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -191,6 +191,23 @@ int rte_eal_dev_attach(const char *name, const char *devargs);
  */
 int rte_eal_dev_detach(const char *name);
 
+/**
+ * Device comparison function.
+ *
+ * @param dev
+ *   Device handle.
+ *
+ * @param data
+ *   Data to compare against.
+ *
+ * @return
+ *   0 if the device matches the data.
+ *   !0 if the device does not match.
+ *   <0 if ordering is possible and the device is lower than the data.
+ *   >0 if ordering is possible and the device is greater than the data.
+ */
+typedef int (*rte_dev_cmp_t)(const struct rte_device *dev, const void *data);
+
 #define RTE_PMD_EXPORT_NAME_ARRAY(n, idx) n##idx[]
 
 #define RTE_PMD_EXPORT_NAME(name, idx) \
-- 
2.1.4