[dpdk-dev] [PATCH 03/22] ethdev: add function to release port in local process

[Qi Zhang]

Add driver API rte_eth_release_port_local to support the requirement
that an ethdev only be released on secondary process, so only local
state be set to unused , share data will not be reset so primary
process can still use it.

Signed-off-by: Qi Zhang <qi.z.zh...@intel.com>
---
 lib/librte_ethdev/rte_ethdev.c        | 24 +++++++++++++++++++++---
 lib/librte_ethdev/rte_ethdev_driver.h | 13 +++++++++++++
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index cd4bfd3c6..ec14adb91 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -359,6 +359,23 @@ rte_eth_dev_attach_secondary(const char *name)
 }
 
 int
+rte_eth_dev_release_port_local(struct rte_eth_dev *eth_dev)
+{
+       if (eth_dev == NULL)
+               return -EINVAL;
+
+       _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_DESTROY, NULL);
+
+       rte_spinlock_lock(&rte_eth_dev_shared_data->ownership_lock);
+
+       eth_dev->state = RTE_ETH_DEV_UNUSED;
+
+       rte_spinlock_unlock(&rte_eth_dev_shared_data->ownership_lock);
+
+       return 0;
+}
+
+int
 rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
 {
        if (eth_dev == NULL)
@@ -370,9 +387,10 @@ rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
 
        rte_spinlock_lock(&rte_eth_dev_shared_data->ownership_lock);
 
-       eth_dev->state = RTE_ETH_DEV_UNUSED;
-
-       memset(eth_dev->data, 0, sizeof(struct rte_eth_dev_data));
+       if (eth_dev->state != RTE_ETH_DEV_UNUSED) {
+               eth_dev->state = RTE_ETH_DEV_UNUSED;
+               memset(eth_dev->data, 0, sizeof(struct rte_eth_dev_data));
+       }
 
        rte_spinlock_unlock(&rte_eth_dev_shared_data->ownership_lock);
 
diff --git a/lib/librte_ethdev/rte_ethdev_driver.h 
b/lib/librte_ethdev/rte_ethdev_driver.h
index c9c825e3f..261335426 100644
--- a/lib/librte_ethdev/rte_ethdev_driver.h
+++ b/lib/librte_ethdev/rte_ethdev_driver.h
@@ -70,6 +70,19 @@ int rte_eth_dev_release_port(struct rte_eth_dev *eth_dev);
 
 /**
  * @internal
+ * Release the specified ethdev port in local process, only set to ethdev
+ * state to unused, but not reset share data since it assume other process
+ * is still using it, typically it is called by secondary process.
+ *
+ * @param eth_dev
+ * The *eth_dev* pointer is the address of the *rte_eth_dev* structure.
+ * @return
+ *   - 0 on success, negative on error
+ */
+int rte_eth_dev_release_port_local(struct rte_eth_dev *eth_dev);
+
+/**
+ * @internal
  * Release device queues and clear its configuration to force the user
  * application to reconfigure it. It is for internal use only.
  *
-- 
2.13.6