ethdev: do nothing if all-multicast mode is applied again

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

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

Also it avoids theoretical cases when already configured all-multicast
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 5cb651e..af82360 100644 (file)
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -1422,16 +1422,24 @@ rte_eth_dev_config_restore(struct rte_eth_dev *dev,
        }
 
        /* replay all multicast configuration */
-       if (rte_eth_allmulticast_get(port_id) == 1) {
-               ret = rte_eth_allmulticast_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_allmulticast_get(port_id) == 1 &&
+           *dev->dev_ops->allmulticast_enable != NULL) {
+               ret = eth_err(port_id,
+                             (*dev->dev_ops->allmulticast_enable)(dev));
                if (ret != 0 && ret != -ENOTSUP) {
                        RTE_ETHDEV_LOG(ERR,
                                "Failed to enable allmulticast mode for device (port %u): %s\n",
                                port_id, rte_strerror(-ret));
                        return ret;
                }
-       } else if (rte_eth_allmulticast_get(port_id) == 0) {
-               ret = rte_eth_allmulticast_disable(port_id);
+       } else if (rte_eth_allmulticast_get(port_id) == 0 &&
+                  *dev->dev_ops->allmulticast_disable != NULL) {
+               ret = eth_err(port_id,
+                             (*dev->dev_ops->allmulticast_disable)(dev));
                if (ret != 0 && ret != -ENOTSUP) {
                        RTE_ETHDEV_LOG(ERR,
                                "Failed to disable allmulticast mode for device (port %u): %s\n",
@@ -1968,16 +1976,17 @@ int
 rte_eth_allmulticast_enable(uint16_t port_id)
 {
        struct rte_eth_dev *dev;
-       uint8_t old_allmulticast;
        int diag;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
        dev = &rte_eth_devices[port_id];
 
+       if (dev->data->all_multicast == 1)
+               return 0;
+
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->allmulticast_enable, -ENOTSUP);
-       old_allmulticast = dev->data->all_multicast;
        diag = (*dev->dev_ops->allmulticast_enable)(dev);
-       dev->data->all_multicast = (diag == 0) ? 1 : old_allmulticast;
+       dev->data->all_multicast = (diag == 0) ? 1 : 0;
 
        return eth_err(port_id, diag);
 }
@@ -1986,18 +1995,19 @@ int
 rte_eth_allmulticast_disable(uint16_t port_id)
 {
        struct rte_eth_dev *dev;
-       uint8_t old_allmulticast;
        int diag;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
        dev = &rte_eth_devices[port_id];
 
+       if (dev->data->all_multicast == 0)
+               return 0;
+
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->allmulticast_disable, -ENOTSUP);
-       old_allmulticast = dev->data->all_multicast;
        dev->data->all_multicast = 0;
        diag = (*dev->dev_ops->allmulticast_disable)(dev);
        if (diag != 0)
-               dev->data->all_multicast = old_allmulticast;
+               dev->data->all_multicast = 1;
 
        return eth_err(port_id, diag);
 }