pci: introduce PCI address parsing function

A new single function that is able to parse all currently supported
format:

   * Domain-Bus-Device-Function
   *        Bus-Device-Function

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>

lib/librte_eal/common/eal_common_pci.c

@@ -199,6 +199,15 @@ rte_eal_compare_pci_addr(const struct rte_pci_addr *addr,
 	return rte_pci_addr_cmp(addr, addr2);
 }
 
+int
+rte_pci_addr_parse(const char *str, struct rte_pci_addr *addr)
+{
+	if (rte_pci_bdf_parse(str, addr) == 0 ||
+	    rte_pci_dbdf_parse(str, addr) == 0)
+		return 0;
+	return -1;
+}
+
 void
 pci_name_set(struct rte_pci_device *dev)
 {

lib/librte_eal/common/include/rte_pci.h

@@ -346,6 +346,20 @@ int rte_pci_addr_cmp(const struct rte_pci_addr *addr,
 int rte_eal_compare_pci_addr(const struct rte_pci_addr *addr,
 			     const struct rte_pci_addr *addr2);
 
+/**
+ * Utility function to parse a string into a PCI location.
+ *
+ * @param str
+ *     The string to parse
+ * @param addr
+ *     The reference to the structure where the location
+ *     is stored.
+ * @return
+ *     0 on success
+ *     <0 otherwise
+ */
+int rte_pci_addr_parse(const char *str, struct rte_pci_addr *addr);
+
 /**
  * Scan the content of the PCI bus, and the devices in the devices
  * list

lib/librte_eal/rte_eal_version.map

@@ -254,6 +254,7 @@ DPDK_17.11 {
 	rte_lcore_has_role;
 	rte_memcpy_ptr;
 	rte_pci_addr_cmp;
+	rte_pci_addr_parse;
 	rte_pci_bdf_parse;
 	rte_pci_dbdf_parse;
 	rte_pci_device_name;