[dpdk-dev] [RFC 2/4] net/ether: add eth_unformat_addr

[Stephen Hemminger <stephen@networkplumber.org>]

Make a function that coresponds with eth_aton_r which can
be used to convert string to ether_addr.

This also allows rte_ethdev to no longer depend on the
cmdline library.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_net/rte_ether.c         | 12 ++++++++++++
 lib/librte_net/rte_ether.h         | 14 ++++++++++++++
 lib/librte_net/rte_net_version.map |  1 +
 3 files changed, 27 insertions(+)

diff --git a/lib/librte_net/rte_ether.c b/lib/librte_net/rte_ether.c
index d4b41f122a16..ca7c841db197 100644
--- a/lib/librte_net/rte_ether.c
+++ b/lib/librte_net/rte_ether.c
@@ -27,3 +27,15 @@ ether_format_addr(char *buf, uint16_t size,
 		 eth_addr->addr_bytes[4],
 		 eth_addr->addr_bytes[5]);
 }
+
+int __rte_experimental
+ether_unformat_addr(const char *str, struct ether_addr *eth_addr)
+{
+	return (sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+		       &eth_addr->addr_bytes[0],
+		       &eth_addr->addr_bytes[1],
+		       &eth_addr->addr_bytes[2],
+		       &eth_addr->addr_bytes[3],
+		       &eth_addr->addr_bytes[4],
+		       &eth_addr->addr_bytes[5]) == 6) ? 0 : -1;
+}
diff --git a/lib/librte_net/rte_ether.h b/lib/librte_net/rte_ether.h
index 46d40412763c..b94e64b2195e 100644
--- a/lib/librte_net/rte_ether.h
+++ b/lib/librte_net/rte_ether.h
@@ -248,6 +248,20 @@ void
 ether_format_addr(char *buf, uint16_t size,
 		  const struct ether_addr *eth_addr);
 
+/**
+ * Convert string with Ethernet address to an ether_addr.
+ *
+ * @param str
+ *   A pointer to buffer contains the formatted MAC address.
+ * @param eth_addr
+ *   A pointer to a ether_addr structure.
+ * @return
+ *   0 if successful
+ *   -1 and sets rte_errno if invalid string
+ */
+int __rte_experimental
+ether_unformat_addr(const char *str, struct ether_addr *eth_addr);
+
 /**
  * Ethernet header: Contains the destination address, source address
  * and frame type.
diff --git a/lib/librte_net/rte_net_version.map b/lib/librte_net/rte_net_version.map
index 49d34093781c..bbf14ff1cdfa 100644
--- a/lib/librte_net/rte_net_version.map
+++ b/lib/librte_net/rte_net_version.map
@@ -26,4 +26,5 @@ EXPERIMENTAL {
 
 	rte_net_make_rarp_packet;
 	rte_net_skip_ip6_ext;
+	eth_unformat_addr;
 };
-- 
2.20.1