[dpdk-dev] [PATCH v4 6/9] bus: add helper to find a bus from a bus name

[Gaetan Rivet]

Signed-off-by: Gaetan Rivet <gaetan.ri...@6wind.com>
---
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |  7 +++++++
 lib/librte_eal/common/eal_common_bus.c          | 19 +++++++++++++++++++
 lib/librte_eal/common/include/rte_bus.h         | 14 ++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  7 +++++++
 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 150b0f7..3517d74 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -197,3 +197,10 @@ DPDK_17.05 {
        vfio_get_group_no;
 
 } DPDK_17.02;
+
+DPDK_17.08 {
+       global:
+
+       rte_bus_from_name;
+
+} DPDK_17.05;
diff --git a/lib/librte_eal/common/eal_common_bus.c 
b/lib/librte_eal/common/eal_common_bus.c
index d9d8f62..2b41ba2 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -220,3 +220,22 @@ rte_bus_name_valid(const char *name)
                i++;
        return i;
 }
+
+static int
+bus_cmp_name(const struct rte_bus *bus, const void *_name)
+{
+       const char *name = _name;
+       size_t i = 0;
+
+       i = rte_bus_name_valid(name);
+       return strncmp(bus->name, name, i);
+}
+
+/* find a bus by its name */
+struct rte_bus *
+rte_bus_from_name(const char *str)
+{
+       if (rte_bus_name_valid(str) == 0)
+               return NULL;
+       return rte_bus_find(bus_cmp_name, str);
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h 
b/lib/librte_eal/common/include/rte_bus.h
index 9b50451..b236893 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -261,6 +261,20 @@ rte_bus_find_device(const struct rte_device *start,
  */
 struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
 
+/*
+ * Find a bus handle by its name.
+ * Compares the name of each bus up until any invalid character
+ * in the matched pattern.
+ *
+ * @param str
+ *     A null terminated character string.
+ *
+ * @return
+ *     A pointer to a bus if found.
+ *     NULL if no bus matches.
+ */
+struct rte_bus *rte_bus_from_name(const char *str);
+
 /**
  * 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 e0a056d..6607acc 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -201,3 +201,10 @@ DPDK_17.05 {
        vfio_get_group_no;
 
 } DPDK_17.02;
+
+DPDK_17.08 {
+       global:
+
+       rte_bus_from_name;
+
+} DPDK_17.05;
-- 
2.1.4