add parameter to the _rte_eth_dev_callback_process function.

Adding a parameter to this function allows passing information
to the application when an eth device event occurs such as
a VF to PF message.
This allows the application to decide if a particular function
is permitted.

Signed-off-by: Alex Zelezniak <az5157 at att.com>
Signed-off-by: Bernard Iremonger <bernard.iremonger at intel.com>
---
 lib/librte_ether/rte_ethdev.c | 5 ++++-
 lib/librte_ether/rte_ethdev.h | 7 ++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index c517e88..416ca77 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -2508,7 +2508,7 @@ rte_eth_dev_callback_unregister(uint8_t port_id,

 void
 _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
-       enum rte_eth_event_type event)
+       enum rte_eth_event_type event, void *param)
 {
        struct rte_eth_dev_callback *cb_lst;
        struct rte_eth_dev_callback dev_cb;
@@ -2519,6 +2519,9 @@ _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
                        continue;
                dev_cb = *cb_lst;
                cb_lst->active = 1;
+               if (param != NULL)
+                       dev_cb.cb_arg = (void *) param;
+
                rte_spinlock_unlock(&rte_eth_dev_cb_lock);
                dev_cb.cb_fn(dev->data->port_id, dev_cb.event,
                                                dev_cb.cb_arg);
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 7218b6f..9fb34ca 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -3026,6 +3026,7 @@ enum rte_eth_event_type {
                                /**< queue state event (enabled/disabled) */
        RTE_ETH_EVENT_INTR_RESET,
                        /**< reset interrupt event, sent to VF on PF reset */
+       RTE_ETH_EVENT_VF_MBOX,  /**< PF mailbox processing callback */
        RTE_ETH_EVENT_MAX       /**< max value of this enum */
 };

@@ -3085,12 +3086,16 @@ int rte_eth_dev_callback_unregister(uint8_t port_id,
  *  Pointer to struct rte_eth_dev.
  * @param event
  *  Eth device interrupt event type.
+ * @param param
+ *  Parameter to pass back to user application.
+ *  Allows the user application to decide if a particular function
+ *  is permitted.
  *
  * @return
  *  void
  */
 void _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
-                               enum rte_eth_event_type event);
+                               enum rte_eth_event_type event, void *param);

 /**
  * When there is no rx packet coming in Rx Queue for a long time, we can
-- 
2.9.0

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