ethdev: count devices consistently

Make the rte_eth_dev_count() return the number of available devices even
after some are detached by the hotplug API or put in a deferred state.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 81b398d..d4ebb1b 100644 (file)
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -72,7 +72,6 @@ static const char *MZ_RTE_ETH_DEV_DATA = "rte_eth_dev_data";
 struct rte_eth_dev rte_eth_devices[RTE_MAX_ETHPORTS];
 static struct rte_eth_dev_data *rte_eth_dev_data;
 static uint8_t eth_dev_last_created_port;
-static uint8_t nb_ports;
 
 /* spinlock for eth device callbacks */
 static rte_spinlock_t rte_eth_dev_cb_lock = RTE_SPINLOCK_INITIALIZER;
@@ -210,7 +209,6 @@ eth_dev_get(uint8_t port_id)
        TAILQ_INIT(&(eth_dev->link_intr_cbs));
 
        eth_dev_last_created_port = port_id;
-       nb_ports++;
 
        return eth_dev;
 }
@@ -283,7 +281,6 @@ rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
                return -EINVAL;
 
        eth_dev->state = RTE_ETH_DEV_UNUSED;
-       nb_ports--;
        return 0;
 }
 
@@ -308,7 +305,15 @@ rte_eth_dev_socket_id(uint8_t port_id)
 uint8_t
 rte_eth_dev_count(void)
 {
-       return nb_ports;
+       uint8_t p;
+       uint8_t count;
+
+       count = 0;
+
+       RTE_ETH_FOREACH_DEV(p)
+               count++;
+
+       return count;
 }
 
 int
@@ -341,9 +346,6 @@ rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
                return -EINVAL;
        }
 
-       if (!nb_ports)
-               return -ENODEV;
-
        RTE_ETH_FOREACH_DEV(i) {
                if (!rte_eth_devices[i].device)
                        continue;

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index ae6e18c..0e99090 100644 (file)
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1750,13 +1750,12 @@ uint8_t rte_eth_find_next(uint8_t port_id);
 
 /**
  * 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
- * [0,  rte_eth_dev_count() - 1] can be operated on by network applications
- * immediately after invoking rte_eal_init().
- * If the application unplugs a port using hotplug function, The enabled port
- * numbers may be noncontiguous. In the case, the applications need to manage
- * enabled port by using the ``RTE_ETH_FOREACH_DEV()`` macro.
+ * initialized by the matching Ethernet driver during the PCI probing phase
+ * and that are available for applications to use. These devices must be
+ * accessed by using the ``RTE_ETH_FOREACH_DEV()`` macro to deal with
+ * non-contiguous ranges of devices.
+ * These non-contiguous ranges can be created by calls to hotplug functions or
+ * by some PMDs.
  *
  * @return
  *   - The total number of usable Ethernet devices.