[dpdk-dev] [PATCH v3 01/10] bus: add bus iterator to find a particular bus

[Gaetan Rivet]

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          | 11 ++++++++
 lib/librte_eal/common/include/rte_bus.h         | 34 +++++++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 47 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map 
b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 2e48a73..ed09ab2 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -162,6 +162,7 @@ DPDK_17.02 {
 DPDK_17.05 {
        global:
 
+       rte_bus_find;
        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 8f9baf8..a54aeb4 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -145,3 +145,14 @@ rte_bus_dump(FILE *f)
                }
        }
 }
+
+struct rte_bus *
+rte_bus_find(rte_bus_cmp_t cmp, const void *data)
+{
+       struct rte_bus *bus = NULL;
+
+       TAILQ_FOREACH(bus, &rte_bus_list, next)
+               if (cmp(bus, data) == 0)
+                       break;
+       return bus;
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h 
b/lib/librte_eal/common/include/rte_bus.h
index 7c36969..16bcfd9 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -141,6 +141,40 @@ int rte_bus_probe(void);
 void rte_bus_dump(FILE *f);
 
 /**
+ * Bus comparison function.
+ *
+ * @param bus
+ *     Bus under test.
+ *
+ * @param data
+ *     Data to compare against.
+ *
+ * @return
+ *     0 if the bus matches the data.
+ *     !0 if the bus does not match.
+ *     <0 if ordering is possible and the bus is lower than the data.
+ *     >0 if ordering is possible and the bus is greater than the data.
+ */
+typedef int (*rte_bus_cmp_t)(const struct rte_bus *bus, const void *data);
+
+/**
+ * Bus iterator to find a particular bus.
+ *
+ * If the callback returns non-zero this function will stop iterating over
+ * any more buses.
+ *
+ * @param cmp
+ *     Comparison function.
+ *
+ * @param data
+ *      Data to pass to cmp callback
+ *
+ * @return
+ *      A pointer to a rte_bus structure or NULL in case no bus matches
+ */
+struct rte_bus *rte_bus_find(rte_bus_cmp_t cmp, const void *data);
+
+/**
  * 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 670bab3..6efa517 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -166,6 +166,7 @@ DPDK_17.02 {
 DPDK_17.05 {
        global:
 
+       rte_bus_find;
        rte_cpu_is_supported;
        rte_intr_free_epoll_fd;
        rte_log_dump;
-- 
2.1.4