[dpdk-dev] [PATCH 2/4] ethdev: add device iterator

[Gaetan Rivet]

This iterator helps applications iterate over the device list and skip
holes caused by invalid or detached devices.

Signed-off-by: Gaetan Rivet <gaetan.rivet at 6wind.com>
---
 lib/librte_ether/rte_ethdev.c | 13 +++++++++++++
 lib/librte_ether/rte_ethdev.h | 19 +++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index d5d1b52..fcb9933 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -138,6 +138,19 @@ enum {
 	STAT_QMAP_RX
 };
 
+uint8_t
+rte_eth_find_next(uint8_t port_id)
+{
+	while (port_id < RTE_MAX_ETHPORTS &&
+	       rte_eth_devices[port_id].state != RTE_ETH_DEV_ATTACHED)
+		port_id++;
+
+	if (port_id >= RTE_MAX_ETHPORTS)
+		return RTE_MAX_ETHPORTS;
+
+	return port_id;
+}
+
 static void
 rte_eth_dev_data_alloc(void)
 {
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index d51b8e9..59c4123 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1731,6 +1731,25 @@ struct rte_eth_dev_data {
 extern struct rte_eth_dev rte_eth_devices[];
 
 /**
+ * Iterates over valid ethdev ports.
+ *
+ * @param: port_id
+ *   The id of the next possible valid port.
+ * @return
+ *   Next valid port id, RTE_MAX_ETHPORTS is there is none.
+ */
+uint8_t rte_eth_find_next(uint8_t port_id);
+
+/**
+ * Macro to iterate over all enabled ethdev ports.
+ */
+#define RTE_ETH_FOREACH_DEV(p)			\
+	for (p = rte_eth_find_next(0);		\
+	     p < RTE_MAX_ETHPORTS;		\
+	     p = rte_eth_find_next(p + 1))
+
+
+/**
  * Get the total number of Ethernet devices that have been successfully
  * initialized by the [matching] Ethernet driver during the PCI probing phase.
  * All devices whose port identifier is in the range
-- 
2.1.4