[PATCH v8 06/14] bus: add helper to find which bus holds a device

[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/bsdapp/eal/rte_eal_version.map   |  1 +
 lib/librte_eal/common/eal_common_bus.c          | 23 +++++++++++++++++++++++
 lib/librte_eal/common/include/rte_bus.h         |  5 +++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 30 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index edf9d7d..458e3a6 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -198,5 +198,6 @@ DPDK_17.08 {
 	global:
 
 	rte_bus_find;
+	rte_bus_find_by_device;
 
 } DPDK_17.05;
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 3094daa..5d06f5d 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -164,3 +164,26 @@ rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
 	}
 	return bus;
 }
+
+static int
+cmp_rte_device(const struct rte_device *dev1, const void *_dev2)
+{
+	const struct rte_device *dev2 = _dev2;
+
+	return dev1 != dev2;
+}
+
+static int
+bus_find_device(const struct rte_bus *bus, const void *_dev)
+{
+	struct rte_device *dev;
+
+	dev = bus->find_device(NULL, cmp_rte_device, _dev);
+	return dev == NULL;
+}
+
+struct rte_bus *
+rte_bus_find_by_device(const struct rte_device *dev)
+{
+	return rte_bus_find(NULL, bus_find_device, (const void *)dev);
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 052ac8d..f8b3215 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -210,6 +210,11 @@ struct rte_bus *rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
 			     const void *data);
 
 /**
+ * Find the registered bus for a particular device.
+ */
+struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
+
+/**
  * Helper for Bus registration.
  * The constructor has higher priority than PMD constructors.
  */
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 944416e..3c193e4 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -203,5 +203,6 @@ DPDK_17.08 {
 	global:
 
 	rte_bus_find;
+	rte_bus_find_by_device;
 
 } DPDK_17.05;
-- 
2.9.4