bus: add helper to find a bus from a device name

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

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 96eb4fd..1d3635c 100644 (file)
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -202,3 +202,24 @@ 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);
+}
+
+struct rte_bus *
+rte_bus_find_by_device_name(const char *str)
+{
+       char name[RTE_DEV_NAME_MAX_LEN];
+       char *c;
+
+       snprintf(name, sizeof(name), "%s", str);
+       c = strchr(name, ',');
+       if (c != NULL)
+               c[0] = '\0';
+       return rte_bus_find(NULL, bus_can_parse, name);
+}

diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 6cacce0..0836339 100644 (file)
--- 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_ */