From: Jan Blunck <jblu...@infradead.org>

Signed-off-by: Jan Blunck <jblu...@infradead.org>
Signed-off-by: Gaetan Rivet <gaetan.ri...@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         | 23 +++++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 49 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 a38b576..9d84727 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -189,3 +189,27 @@ struct rte_bus *rte_bus_find_by_device(const struct 
rte_device *dev)
 {
        return rte_bus_find(bus_find_device, (const void *)dev, NULL);
 }
+
+struct rte_device *
+rte_bus_find_device(const struct rte_device *start,
+                   rte_dev_cmp_t cmp, const void *data)
+{
+       struct rte_bus *bus;
+       struct rte_device *dev = NULL;
+       int started = start == NULL;
+
+       TAILQ_FOREACH(bus, &rte_bus_list, next) {
+               if (!bus->find_device)
+                       continue;
+               if (!started) {
+                       dev = bus->find_device(cmp_rte_device, start);
+                       if (dev)
+                               started = 1;
+                       continue;
+               }
+               dev = bus->find_device(cmp, data);
+               if (dev)
+                       break;
+       }
+       return dev;
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h 
b/lib/librte_eal/common/include/rte_bus.h
index fa12f55..e078c00 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -189,6 +189,29 @@ struct rte_bus *rte_bus_find(rte_bus_cmp_t cmp,
                             const struct rte_bus *start);
 
 /**
+ * Bus iterator to find a particular device.
+ *
+ * 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 cmp
+ *      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,
+                   rte_dev_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);
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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