[dpdk-dev] [PATCH] net/vhost: add an API for get queue status

[Noa Ezra <noae@mellanox.com>]

Add an API that returns queue status for requested queue in the port.
The queue's status can be changed before the user has signed for the
queue state event interrupt. In this case the user can't know the
current queue's status. This API returns the current status.

Signed-off-by: Noa Ezra <noae@mellanox.com>
Reviewed-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/vhost/rte_eth_vhost.c           | 47 +++++++++++++++++++++++++++++
 drivers/net/vhost/rte_eth_vhost.h           | 18 +++++++++++
 drivers/net/vhost/rte_pmd_vhost_version.map |  6 ++++
 3 files changed, 71 insertions(+)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 9a54020..cad1e5c 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -855,6 +855,7 @@ struct vhost_xstats_name_off {
 	/* won't be NULL */
 	state = vring_states[eth_dev->data->port_id];
 	rte_spinlock_lock(&state->lock);
+
 	state->cur[vring] = enable;
 	state->max_vring = RTE_MAX(vring, state->max_vring);
 	rte_spinlock_unlock(&state->lock);
@@ -874,6 +875,52 @@ struct vhost_xstats_name_off {
 };
 
 int
+rte_eth_vhost_get_queue_status(uint16_t port_id, bool rx, uint16_t queue_id,
+		bool *queue_status)
+{
+	struct rte_vhost_vring_state *state;
+	struct internal_list *list;
+	struct rte_eth_dev *eth_dev;
+	int found = 0;
+	uint16_t nb_q = 0;
+
+	if (port_id >= RTE_MAX_ETHPORTS) {
+		VHOST_LOG(ERR, "Invalid port id\n");
+		return -1;
+	}
+	TAILQ_FOREACH(list, &internal_list, next) {
+		eth_dev = list->eth_dev;
+		if (eth_dev->data->port_id == port_id) {
+			nb_q = rx ? eth_dev->data->nb_rx_queues :
+					eth_dev->data->nb_tx_queues;
+			found = 1;
+			break;
+		}
+	}
+	if (!found) {
+		VHOST_LOG(ERR, "No device found for port id %u\n", port_id);
+		return -1;
+	}
+	if (queue_id >= nb_q) {
+		VHOST_LOG(ERR, "Invalid queue id\n");
+		return -1;
+	}
+
+	state = vring_states[port_id];
+	if (!state) {
+		VHOST_LOG(ERR, "Unused port\n");
+		return -1;
+	}
+
+	rte_spinlock_lock(&state->lock);
+	*queue_status = rx ? state->cur[queue_id * 2 + 1] :
+			state->cur[queue_id * 2];
+	rte_spinlock_unlock(&state->lock);
+
+	return 0;
+}
+
+int
 rte_eth_vhost_get_queue_event(uint16_t port_id,
 		struct rte_eth_vhost_queue_event *event)
 {
diff --git a/drivers/net/vhost/rte_eth_vhost.h b/drivers/net/vhost/rte_eth_vhost.h
index 0e68b9f..1e65c69 100644
--- a/drivers/net/vhost/rte_eth_vhost.h
+++ b/drivers/net/vhost/rte_eth_vhost.h
@@ -44,6 +44,24 @@ int rte_eth_vhost_get_queue_event(uint16_t port_id,
 		struct rte_eth_vhost_queue_event *event);
 
 /**
+ * Get queue status for specific queue in the port.
+ *
+ * @param[in] port_id
+ *  Port id.
+ * @param[in] rx
+ *  True is rx, False if tx
+ * @paran[in] queue_id
+ *  Queue_id
+ * @param[out] queue_status
+ *  Pointer to a boolean, True is enable, False if disable.
+ * @return
+ *  - On success, zero, queue_status is updated.
+ *  - On failure, a negative value, queue_status is not updated.
+ */
+int rte_eth_vhost_get_queue_status(uint16_t port_id, bool rx, uint16_t queue_id,
+		bool *queue_status);
+
+/**
  * Get the 'vid' value associated with the specified port.
  *
  * @return
diff --git a/drivers/net/vhost/rte_pmd_vhost_version.map b/drivers/net/vhost/rte_pmd_vhost_version.map
index 695db85..1eabfd2 100644
--- a/drivers/net/vhost/rte_pmd_vhost_version.map
+++ b/drivers/net/vhost/rte_pmd_vhost_version.map
@@ -11,3 +11,9 @@ DPDK_16.11 {
 
 	rte_eth_vhost_get_vid_from_port_id;
 };
+
+DPDK_19.08 {
+	global:
+
+	rte_eth_vhost_get_queue_status;
+};
-- 
1.8.3.1