[dpdk-dev] [PATCH v3 1/3] lib/librte_ether: add support for port reset

[Wei Zhao <wei.zhao1@intel.com>]

Add support for port reset in rte layer.This reset
feature can not only used in vf port reset in later code
develop, but alsopf port.But in this patch set, we only
limit the discussion scope to vf reset.
This patch Add an API to restart 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
restart 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 restart
the device, then recover the device and rx/tx.
Also, it's APP's responsibilty to release the occupied
memory.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
---
 lib/librte_ether/rte_ethdev.c          | 17 +++++++++++++++++
 lib/librte_ether/rte_ethdev.h          | 25 +++++++++++++++++++++++++
 lib/librte_ether/rte_ether_version.map |  6 ++++++
 3 files changed, 48 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index eb0a94a..2e06dca 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3273,3 +3273,20 @@ 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, -ENODEV);
+
+	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 4be217c..34412c0 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1367,6 +1367,9 @@ 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 {
@@ -1509,6 +1512,9 @@ struct eth_dev_ops {
 	eth_l2_tunnel_offload_set_t   l2_tunnel_offload_set;
 	/** Enable/disable l2 tunnel offload functions. */
 
+	/** Reset device. */
+	eth_dev_reset_t dev_reset;
+
 	eth_set_queue_rate_limit_t set_queue_rate_limit; /**< Set queue rate limit. */
 
 	rss_hash_update_t          rss_hash_update; /** Configure RSS hash protocols. */
@@ -4413,6 +4419,25 @@ int
 rte_eth_dev_get_name_by_port(uint8_t port_id, char *name);
 
 /**
+ * Reset an ethernet device when it's not working. One scenario is, after PF
+ * port is down and up, the related VF port should be reset.
+ * The API will stop the port, clear the rx/tx queues, re-setup the rx/tx
+ * queues, restart the port.
+ * Before calling this API, APP should stop the rx/tx. When tx is being stopped,
+ * APP can drop the packets and release the buffer instead of sending them.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ *
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if port identifier is invalid.
+ *   - (-ENOTSUP) if hardware doesn't support this function.
+ */
+int
+rte_eth_dev_reset(uint8_t port_id);
+
+/**
  * @internal
  * Wrapper for use by pci drivers as a .probe function to attach to a ethdev
  * interface.
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index c6c9d0d..529b27f 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -154,3 +154,9 @@ DPDK_17.02 {
 	rte_flow_validate;
 
 } DPDK_16.11;
+
+DPDK_17.05 {
+	global:
+
+	rte_eth_dev_reset;
+} DPDK_17.02;
\ No newline at end of file
-- 
2.9.3