ethdev: keep port id unchanged if obtaining by name failed

Currently, 'rte_eth_dev_get_port_by_name' changes transmitted
'port_id' unconditionally. This is undocumented and misleading
behaviour as user may expect unchanged value in case of error.

Otherwise, there is no sense having both return value and
a pointer in the function.

Fixes: 9c5b8d8b9feb ("ethdev: clean port id retrieval when attaching")

Signed-off-by: Ilya Maximets <i.maximets@samsung.com>

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 83898a8..64aefdd 100644 (file)
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -339,7 +339,6 @@ rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
        if (!nb_ports)
                return -ENODEV;
 
-       *port_id = RTE_MAX_ETHPORTS;
        RTE_ETH_FOREACH_DEV(i) {
                if (!strncmp(name,
                        rte_eth_dev_data[i].name, strlen(name))) {

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 121058c..2784ad1 100644 (file)
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -4587,7 +4587,7 @@ rte_eth_dev_l2_tunnel_offload_set(uint8_t port_id,
 * @param port_id
 *   pointer to port identifier of the device
 * @return
-*   - (0) if successful.
+*   - (0) if successful and port_id is filled.
 *   - (-ENODEV or -EINVAL) on failure.
 */
 int