[dpdk-dev] [PATCH v4 3/9] bus: add helper to find bus for a particular device

[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/bsdapp/eal/rte_eal_version.map   |  1 +
 lib/librte_eal/common/eal_common_bus.c          | 24 ++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_bus.h         |  5 +++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 31 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index ed09ab2..f1a0765 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -163,6 +163,7 @@ DPDK_17.05 {
 	global:
 
 	rte_bus_find;
+	rte_bus_find_by_device;
 	rte_cpu_is_supported;
 	rte_log_dump;
 	rte_log_register;
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 4619eb2..a38b576 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -165,3 +165,27 @@ rte_bus_find(rte_bus_cmp_t cmp,
 	}
 	return bus;
 }
+
+static int
+cmp_rte_device(const struct rte_device *dev, const void *_dev2)
+{
+	const struct rte_device *dev2 = _dev2;
+
+	return !(dev == dev2);
+}
+
+static int
+bus_find_device(const struct rte_bus *bus, const void *_dev)
+{
+	struct rte_device *dev;
+
+	if (!bus->find_device)
+		return -1;
+	dev = bus->find_device(cmp_rte_device, _dev);
+	return !dev;
+}
+
+struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev)
+{
+	return rte_bus_find(bus_find_device, (const void *)dev, NULL);
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index fe9573f..fa12f55 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -189,6 +189,11 @@ struct rte_bus *rte_bus_find(rte_bus_cmp_t cmp,
 			     const struct rte_bus *start);
 
 /**
+ * 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 6efa517..6f77222 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -167,6 +167,7 @@ DPDK_17.05 {
 	global:
 
 	rte_bus_find;
+	rte_bus_find_by_device;
 	rte_cpu_is_supported;
 	rte_intr_free_epoll_fd;
 	rte_log_dump;
-- 
2.1.4