ethdev: do nothing if promiscuous mode is applied again

Since driver callbacks return status code now, there is no necessity
to enable or disable promiscuous mode once again if it is already
successfully enabled or disabled.

Configuration restore at startup tries to ensure that configured
promiscuous mode is applied and start will return error if it fails.

Also it avoids theoretical cases when already configured promiscuous
mode is applied once again and fails. In this cases it is unclear
which value should be reported on get (configured or opposite).

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index f2e6b4c..2ad0069 100644 (file)
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -1391,16 +1391,24 @@ rte_eth_dev_config_restore(struct rte_eth_dev *dev,
                rte_eth_dev_mac_restore(dev, dev_info);
 
        /* replay promiscuous configuration */
-       if (rte_eth_promiscuous_get(port_id) == 1) {
-               ret = rte_eth_promiscuous_enable(port_id);
+       /*
+        * use callbacks directly since we don't need port_id check and
+        * would like to bypass the same value set
+        */
+       if (rte_eth_promiscuous_get(port_id) == 1 &&
+           *dev->dev_ops->promiscuous_enable != NULL) {
+               ret = eth_err(port_id,
+                             (*dev->dev_ops->promiscuous_enable)(dev));
                if (ret != 0 && ret != -ENOTSUP) {
                        RTE_ETHDEV_LOG(ERR,
                                "Failed to enable promiscuous mode for device (port %u): %s\n",
                                port_id, rte_strerror(-ret));
                        return ret;
                }
-       } else if (rte_eth_promiscuous_get(port_id) == 0) {
-               ret = rte_eth_promiscuous_disable(port_id);
+       } else if (rte_eth_promiscuous_get(port_id) == 0 &&
+                  *dev->dev_ops->promiscuous_disable != NULL) {
+               ret = eth_err(port_id,
+                             (*dev->dev_ops->promiscuous_disable)(dev));
                if (ret != 0 && ret != -ENOTSUP) {
                        RTE_ETHDEV_LOG(ERR,
                                "Failed to disable promiscuous mode for device (port %u): %s\n",
@@ -1892,16 +1900,17 @@ int
 rte_eth_promiscuous_enable(uint16_t port_id)
 {
        struct rte_eth_dev *dev;
-       uint8_t old_promiscuous;
-       int diag;
+       int diag = 0;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
        dev = &rte_eth_devices[port_id];
 
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->promiscuous_enable, -ENOTSUP);
-       old_promiscuous = dev->data->promiscuous;
-       diag = (*dev->dev_ops->promiscuous_enable)(dev);
-       dev->data->promiscuous = (diag == 0) ? 1 : old_promiscuous;
+
+       if (dev->data->promiscuous == 0) {
+               diag = (*dev->dev_ops->promiscuous_enable)(dev);
+               dev->data->promiscuous = (diag == 0) ? 1 : 0;
+       }
 
        return eth_err(port_id, diag);
 }
@@ -1910,18 +1919,19 @@ int
 rte_eth_promiscuous_disable(uint16_t port_id)
 {
        struct rte_eth_dev *dev;
-       uint8_t old_promiscuous;
-       int diag;
+       int diag = 0;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
        dev = &rte_eth_devices[port_id];
 
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->promiscuous_disable, -ENOTSUP);
-       old_promiscuous = dev->data->promiscuous;
-       dev->data->promiscuous = 0;
-       diag = (*dev->dev_ops->promiscuous_disable)(dev);
-       if (diag != 0)
-               dev->data->promiscuous = old_promiscuous;
+
+       if (dev->data->promiscuous == 1) {
+               dev->data->promiscuous = 0;
+               diag = (*dev->dev_ops->promiscuous_disable)(dev);
+               if (diag != 0)
+                       dev->data->promiscuous = 1;
+       }
 
        return eth_err(port_id, diag);
 }