[PATCH v7 2/2] net/ixgbe: add callback to user app on VF to PF mbox msg

[Bernard Iremonger <bernard.iremonger@intel.com>]

call _rte_eth_dev_callback_process from ixgbe_rcv_msg_from_vf function.

The callback asks the user application if it is allowed to perform
the function.

If the cb_param.retval is RTE_PMD_IXGBE_MB_EVENT_PROCEED then continue,
if 0, do nothing and send ACK to VF
if > 1, do nothing and send NAK to VF.

Signed-off-by: Alex Zelezniak <az5157@att.com>
Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
---
 drivers/net/ixgbe/ixgbe_pf.c      | 42 +++++++++++++++++++++++++++++++++------
 drivers/net/ixgbe/rte_pmd_ixgbe.h | 20 +++++++++++++++++++
 2 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_pf.c b/drivers/net/ixgbe/ixgbe_pf.c
index 56393ff..2a177b8 100644
--- a/drivers/net/ixgbe/ixgbe_pf.c
+++ b/drivers/net/ixgbe/ixgbe_pf.c
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -51,6 +51,7 @@
 
 #include "base/ixgbe_common.h"
 #include "ixgbe_ethdev.h"
+#include "rte_pmd_ixgbe.h"
 
 #define IXGBE_MAX_VFTA     (128)
 #define IXGBE_VF_MSG_SIZE_DEFAULT 1
@@ -660,6 +661,7 @@ ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct ixgbe_vf_info *vfinfo =
 		*IXGBE_DEV_PRIVATE_TO_P_VFDATA(dev->data->dev_private);
+	struct rte_pmd_ixgbe_mb_event_param cb_param;
 
 	retval = ixgbe_read_mbx(hw, msgbuf, mbx_size, vf);
 	if (retval) {
@@ -674,27 +676,54 @@ ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
 	/* flush the ack before we write any messages back */
 	IXGBE_WRITE_FLUSH(hw);
 
+	/**
+	 * initialise structure to send to user application
+	 * will return response from user in retval field
+	 */
+	cb_param.retval = RTE_PMD_IXGBE_MB_EVENT_PROCEED;
+	cb_param.vfid = vf;
+	cb_param.msg_type = msgbuf[0] & 0xFFFF;
+	cb_param.userdata = (void *)msgbuf;
+
 	/* perform VF reset */
 	if (msgbuf[0] == IXGBE_VF_RESET) {
 		int ret = ixgbe_vf_reset(dev, vf, msgbuf);
 
 		vfinfo[vf].clear_to_send = true;
+
+		/* notify application about VF reset */
+		_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_VF_MBOX, &cb_param);
 		return ret;
 	}
 
+	/**
+	 * ask user application if we allowed to perform those functions
+	 * if we get cb_param.retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED
+	 * then business as usual,
+	 * if 0, do nothing and send ACK to VF
+	 * if cb_param.retval > 1, do nothing and send NAK to VF
+	 */
+	_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_VF_MBOX, &cb_param);
+
+	retval = cb_param.retval;
+
 	/* check & process VF to PF mailbox message */
 	switch ((msgbuf[0] & 0xFFFF)) {
 	case IXGBE_VF_SET_MAC_ADDR:
-		retval = ixgbe_vf_set_mac_addr(dev, vf, msgbuf);
+		if (retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED)
+			retval = ixgbe_vf_set_mac_addr(dev, vf, msgbuf);
 		break;
 	case IXGBE_VF_SET_MULTICAST:
-		retval = ixgbe_vf_set_multicast(dev, vf, msgbuf);
+		if (retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED)
+			retval = ixgbe_vf_set_multicast(dev, vf, msgbuf);
 		break;
 	case IXGBE_VF_SET_LPE:
-		retval = ixgbe_set_vf_lpe(dev, vf, msgbuf);
+		if (retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED)
+			retval = ixgbe_set_vf_lpe(dev, vf, msgbuf);
 		break;
 	case IXGBE_VF_SET_VLAN:
-		retval = ixgbe_vf_set_vlan(dev, vf, msgbuf);
+		if (retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED)
+			retval = ixgbe_vf_set_vlan(dev, vf, msgbuf);
 		break;
 	case IXGBE_VF_API_NEGOTIATE:
 		retval = ixgbe_negotiate_vf_api(dev, vf, msgbuf);
@@ -704,7 +733,8 @@ ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
 		msg_size = IXGBE_VF_GET_QUEUE_MSG_SIZE;
 		break;
 	case IXGBE_VF_UPDATE_XCAST_MODE:
-		retval = ixgbe_set_vf_mc_promisc(dev, vf, msgbuf);
+		if (retval == RTE_PMD_IXGBE_MB_EVENT_PROCEED)
+			retval = ixgbe_set_vf_mc_promisc(dev, vf, msgbuf);
 		break;
 	default:
 		PMD_DRV_LOG(DEBUG, "Unhandled Msg %8.8x", (unsigned)msgbuf[0]);
diff --git a/drivers/net/ixgbe/rte_pmd_ixgbe.h b/drivers/net/ixgbe/rte_pmd_ixgbe.h
index 2689668..8665cea 100644
--- a/drivers/net/ixgbe/rte_pmd_ixgbe.h
+++ b/drivers/net/ixgbe/rte_pmd_ixgbe.h
@@ -179,4 +179,24 @@ int rte_pmd_ixgbe_set_vf_split_drop_en(uint8_t port, uint16_t vf, uint8_t on);
  */
 int
 rte_pmd_ixgbe_set_vf_vlan_stripq(uint8_t port, uint16_t vf, uint8_t on);
+
+/**
+ * Response sent back to ixgbe driver from user app after callback
+ */
+enum rte_pmd_ixgbe_mb_event_rsp {
+	RTE_PMD_IXGBE_MB_EVENT_NOOP_ACK,  /**< skip mbox request and ACK */
+	RTE_PMD_IXGBE_MB_EVENT_NOOP_NACK, /**< skip mbox request and NACK */
+	RTE_PMD_IXGBE_MB_EVENT_PROCEED,  /**< proceed with mbox request  */
+	RTE_PMD_IXGBE_MB_EVENT_MAX       /**< max value of this enum */
+};
+
+/**
+ * Data sent to the user application when the callback is executed.
+ */
+struct rte_pmd_ixgbe_mb_event_param {
+	uint16_t vfid;     /**< Virtual Function number */
+	uint16_t msg_type; /**< message type */
+	uint16_t retval;   /**< return value */
+	void *userdata;    /**< pointer to user data */
+};
 #endif /* _PMD_IXGBE_H_ */
-- 
2.9.0