[dpdk-dev] [PATCH v6 5/6] bus: add helper to find a bus from a device name

Gaetan Rivet gaetan.rivet at 6wind.com
Tue Jul 4 02:58:32 CEST 2017


Find which bus should be able to parse this device name into an internal
device representation.

Signed-off-by: Gaetan Rivet <gaetan.rivet at 6wind.com>
---
 lib/librte_eal/common/eal_common_bus.c | 15 +++++++++++++++
 lib/librte_eal/common/eal_private.h    | 12 ++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 87b0c6e..b143f21 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -204,3 +204,18 @@ rte_bus_find_by_name(const char *busname)
 {
 	return rte_bus_find(NULL, cmp_bus_name, (const void *)busname);
 }
+
+static int
+bus_can_parse(const struct rte_bus *bus, const void *_name)
+{
+	const char *name = _name;
+
+	return !(bus->parse && bus->parse(name, NULL) == 0);
+}
+
+/* find a bus capable of parsing a device description */
+struct rte_bus *
+rte_bus_find_by_device_name(const char *str)
+{
+	return rte_bus_find(NULL, bus_can_parse, str);
+}
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 6cacce0..0836339 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -338,4 +338,16 @@ int rte_eal_hugepage_attach(void);
  */
 bool rte_eal_using_phys_addrs(void);
 
+/**
+ * Find a bus capable of identifying a device.
+ *
+ * @param str
+ *   A device identifier (PCI address, virtual PMD name, ...).
+ *
+ * @return
+ *   A valid bus handle if found.
+ *   NULL if no bus is able to parse this device.
+ */
+struct rte_bus *rte_bus_find_by_device_name(const char *str);
+
 #endif /* _EAL_PRIVATE_H_ */
-- 
2.1.4



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