[dpdk-dev] [PATCH 4/9] bus: add bus helper iterator to find a particular device

Gaetan Rivet gaetan.rivet at 6wind.com
Wed May 24 17:04:56 CEST 2017


From: Jan Blunck <jblunck at infradead.org>

Signed-off-by: Jan Blunck <jblunck at infradead.org>
---
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |  1 +
 lib/librte_eal/common/eal_common_bus.c          | 26 +++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_bus.h         | 26 +++++++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 54 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index f1a0765..21640d6 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -164,6 +164,7 @@ DPDK_17.05 {
 
 	rte_bus_find;
 	rte_bus_find_by_device;
+	rte_bus_find_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 97bcd65..b8f8384 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -182,3 +182,29 @@ struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev)
 {
 	return rte_bus_find(bus_find_device, (const void *)dev);
 }
+
+struct rte_device *
+rte_bus_find_device(const struct rte_device *start,
+	int (*match)(const struct rte_device *dev, const void *data),
+	const void *data)
+{
+	struct rte_bus *bus;
+	struct rte_device *dev = NULL;
+
+	if (start) {
+		bus = rte_bus_find_by_device(start);
+		if (!bus)
+			return NULL;
+	} else
+		bus = TAILQ_FIRST(&rte_bus_list);
+
+	while (bus) {
+		dev = bus->find_device(match, data);
+		if (dev)
+			break;
+
+		TAILQ_NEXT(bus, next);
+	}
+
+	return dev;
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 1707a1f..3b22fb8 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -169,6 +169,32 @@ struct rte_bus *rte_bus_find(
 	const void *data);
 
 /**
+ * Bus iterator to find a particular device.
+ *
+ * The callback function should return 0 if the device doesn't match and
+ * non-zero if it does. If the callback returns non-zero this function will
+ * stop iterating over any more buses and devices.
+ * To continue a search the device of a previous search is passed via the start
+ * parameters.
+ *
+ * @param start
+ *	 Start device of the iteration
+ *
+ * @param match
+ *	 Callback function to check device
+ *
+ * @param data
+ *	 Data to pass to match callback
+ *
+ * @return
+ *	 A pointer to a rte_bus structure or NULL in case no bus matches
+ */
+struct rte_device *
+rte_bus_find_device(const struct rte_device *start,
+	int (*match)(const struct rte_device *dev, const void *data),
+	const void *data);
+
+/**
  * Find the registered bus for a particular device.
  */
 struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 6f77222..e0a056d 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -168,6 +168,7 @@ DPDK_17.05 {
 
 	rte_bus_find;
 	rte_bus_find_by_device;
+	rte_bus_find_device;
 	rte_cpu_is_supported;
 	rte_intr_free_epoll_fd;
 	rte_log_dump;
-- 
2.1.4



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