[dpdk-dev] [PATCH 3/7] ethdev: add support of restoration of port status

[Wei Dai]

As dev->data->dev_link.link_status may change when the port is
initialized again, this patch adds dev->data->restore_link for
restoration.
In the restoration process, ethdev layer can restore link status
as up or down by comparing dev->data->restore_link.link_status
and dev->data->dev_link.link_status.

Signed-off-by: Wei Dai <wei....@intel.com>
---
 lib/librte_ether/rte_ethdev.c | 37 +++++++++++++++++++++++++++++++++++--
 lib/librte_ether/rte_ethdev.h |  1 +
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 97c0044..af8ccf6 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -923,6 +923,28 @@ rte_eth_dev_tx_queue_restore(uint8_t port_id, uint16_t 
queue_id)
 }
 
 static void
+rte_eth_dev_link_status_restore(uint8_t port_id)
+{
+       struct rte_eth_dev *dev;
+
+       dev = &rte_eth_devices[port_id];
+
+       if (dev->data->in_restoration == 0) {
+               dev->data->restore_link.link_status =
+                       dev->data->dev_link.link_status;
+               return;
+       }
+
+       if (dev->data->restore_link.link_status
+           != dev->data->dev_link.link_status) {
+               if (dev->data->restore_link.link_status != 0)
+                       rte_eth_dev_set_link_up(port_id);
+               else
+                       rte_eth_dev_set_link_down(port_id);
+       }
+}
+
+static void
 rte_eth_dev_config_restore(uint8_t port_id)
 {
        struct rte_eth_dev *dev;
@@ -982,6 +1004,7 @@ rte_eth_dev_config_restore(uint8_t port_id)
        for (q = 0; q < dev->data->nb_tx_queues; q++)
                rte_eth_dev_tx_queue_restore(port_id, q);
 
+       rte_eth_dev_link_status_restore(port_id);
 }
 
 int
@@ -1014,6 +1037,8 @@ rte_eth_dev_start(uint8_t port_id)
        if (dev->data->dev_conf.intr_conf.lsc == 0) {
                RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->link_update, -ENOTSUP);
                (*dev->dev_ops->link_update)(dev, 0);
+               dev->data->restore_link.link_status =
+                       dev->data->dev_link.link_status;
        }
        return 0;
 }
@@ -1043,26 +1068,34 @@ int
 rte_eth_dev_set_link_up(uint8_t port_id)
 {
        struct rte_eth_dev *dev;
+       int ret;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 
        dev = &rte_eth_devices[port_id];
 
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_set_link_up, -ENOTSUP);
-       return (*dev->dev_ops->dev_set_link_up)(dev);
+       ret = (*dev->dev_ops->dev_set_link_up)(dev);
+       if (!ret)
+               dev->data->restore_link.link_status = 1;
+       return ret;
 }
 
 int
 rte_eth_dev_set_link_down(uint8_t port_id)
 {
        struct rte_eth_dev *dev;
+       int ret;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 
        dev = &rte_eth_devices[port_id];
 
        RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_set_link_down, -ENOTSUP);
-       return (*dev->dev_ops->dev_set_link_down)(dev);
+       ret = (*dev->dev_ops->dev_set_link_down)(dev);
+       if (!ret)
+               dev->data->restore_link.link_status = 0;
+       return ret;
 }
 
 void
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 7a2ce07..9428f57 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1734,6 +1734,7 @@ struct rte_eth_dev_data {
        void *dev_private;              /**< PMD-specific private data */
 
        struct rte_eth_link dev_link;
+       struct rte_eth_link restore_link;
        /**< Link-level information & status */
 
        struct rte_eth_conf dev_conf;   /**< Configuration applied to device. */
-- 
2.7.4