[dpdk-dev] [PATCH v5 1/4] lib/librte_ether: support device reset

[Wenzhuo Lu]

Add an API to reset the device.
It's for VF device in this scenario, kernel PF + DPDK VF.
When the PF port down->up, APP should call this API to
reset VF port. Most likely, APP should call it in its
management thread and guarantee the thread safe. It means
APP should stop the rx/tx and the device, then reset the
device, then recover the device and rx/tx.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 lib/librte_ether/rte_ethdev.c          | 17 +++++++++++++++++
 lib/librte_ether/rte_ethdev.h          | 14 ++++++++++++++
 lib/librte_ether/rte_ether_version.map |  7 +++++++
 3 files changed, 38 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index e148028..e43dca9 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3346,3 +3346,20 @@ rte_eth_dev_l2_tunnel_offload_set(uint8_t port_id,
 				-ENOTSUP);
 	return (*dev->dev_ops->l2_tunnel_offload_set)(dev, l2_tunnel, mask, en);
 }
+
+int
+rte_eth_dev_reset(uint8_t port_id)
+{
+	struct rte_eth_dev *dev;
+	int diag;
+
+	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_reset, -ENOTSUP);
+
+	diag = (*dev->dev_ops->dev_reset)(dev);
+
+	return diag;
+}
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 2757510..74e895f 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1318,6 +1318,9 @@ typedef int (*eth_l2_tunnel_offload_set_t)
 	 uint8_t en);
 /**< @internal enable/disable the l2 tunnel offload functions */
 
+typedef int  (*eth_dev_reset_t)(struct rte_eth_dev *dev);
+/**< @internal Function used to reset a configured Ethernet device. */
+
 #ifdef RTE_NIC_BYPASS
 
 enum {
@@ -1508,6 +1511,8 @@ struct eth_dev_ops {
 	eth_l2_tunnel_eth_type_conf_t l2_tunnel_eth_type_conf;
 	/** Enable/disable l2 tunnel offload functions */
 	eth_l2_tunnel_offload_set_t l2_tunnel_offload_set;
+	/** Reset device. */
+	eth_dev_reset_t dev_reset;
 };
 
 /**
@@ -4253,6 +4258,15 @@ rte_eth_dev_l2_tunnel_offload_set(uint8_t port_id,
 				  uint32_t mask,
 				  uint8_t en);
 
+/**
+ * Reset an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ */
+int
+rte_eth_dev_reset(uint8_t port_id);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 214ecc7..c34207e 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -132,3 +132,10 @@ DPDK_16.04 {
 	rte_eth_tx_buffer_set_err_callback;
 
 } DPDK_2.2;
+
+DPDK_16.07 {
+	global:
+
+	rte_eth_dev_reset;
+
+} DPDK_16.04;
-- 
1.9.3