[dpdk-dev] [PATCH v2 1/4] ether: support deferred queue setup

[Qi Zhang]

The patch let etherdev driver expose the capability flag through
rte_eth_dev_info_get when it support deferred queue configuraiton,
then base on the flag rte_eth_[rx|tx]_queue_setup could decide
continue to setup the queue or just return fail when device already
started.

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
 doc/guides/nics/features.rst  |  8 ++++++++
 lib/librte_ether/rte_ethdev.c | 30 ++++++++++++++++++------------
 lib/librte_ether/rte_ethdev.h | 11 +++++++++++
 3 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 1b4fb979f..36ad21a1f 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -892,7 +892,15 @@ Documentation describes performance values.
 
 See ``dpdk.org/doc/perf/*``.
 
+.. _nic_features_queue_deferred_setup_capabilities:
 
+Queue deferred setup capabilities
+---------------------------------
+
+Supports queue setup / release after device started.
+
+* **[provides] rte_eth_dev_info**: ``deferred_queue_config_capa:DEV_DEFERRED_RX_QUEUE_SETUP,DEV_DEFERRED_TX_QUEUE_SETUP,DEV_DEFERRED_RX_QUEUE_RELEASE,DEV_DEFERRED_TX_QUEUE_RELEASE``.
+* **[related]  API**: ``rte_eth_dev_info_get()``.
 
 .. _nic_features_other:
 
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index a6ce2a5ba..6c906c4df 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1425,12 +1425,6 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
 		return -EINVAL;
 	}
 
-	if (dev->data->dev_started) {
-		RTE_PMD_DEBUG_TRACE(
-		    "port %d must be stopped to allow configuration\n", port_id);
-		return -EBUSY;
-	}
-
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, -ENOTSUP);
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_setup, -ENOTSUP);
 
@@ -1474,10 +1468,19 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.deferred_queue_config_capa &
+			DEV_DEFERRED_RX_QUEUE_SETUP))
+		return -EINVAL;
+
 	rxq = dev->data->rx_queues;
 	if (rxq[rx_queue_id]) {
 		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_release,
 					-ENOTSUP);
+		if (dev->data->dev_started &&
+			!(dev_info.deferred_queue_config_capa &
+				DEV_DEFERRED_RX_QUEUE_RELEASE))
+			return -EINVAL;
 		(*dev->dev_ops->rx_queue_release)(rxq[rx_queue_id]);
 		rxq[rx_queue_id] = NULL;
 	}
@@ -1573,12 +1576,6 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
 		return -EINVAL;
 	}
 
-	if (dev->data->dev_started) {
-		RTE_PMD_DEBUG_TRACE(
-		    "port %d must be stopped to allow configuration\n", port_id);
-		return -EBUSY;
-	}
-
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, -ENOTSUP);
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_setup, -ENOTSUP);
 
@@ -1596,10 +1593,19 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.deferred_queue_config_capa &
+			DEV_DEFERRED_TX_QUEUE_SETUP))
+		return -EINVAL;
+
 	txq = dev->data->tx_queues;
 	if (txq[tx_queue_id]) {
 		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_release,
 					-ENOTSUP);
+		if (dev->data->dev_started &&
+			!(dev_info.deferred_queue_config_capa &
+				DEV_DEFERRED_TX_QUEUE_RELEASE))
+			return -EINVAL;
 		(*dev->dev_ops->tx_queue_release)(txq[tx_queue_id]);
 		txq[tx_queue_id] = NULL;
 	}
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 036153306..410e58c50 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -981,6 +981,15 @@ struct rte_eth_conf {
  */
 #define DEV_TX_OFFLOAD_SECURITY         0x00020000
 
+#define DEV_DEFERRED_RX_QUEUE_SETUP 0x00000001
+/**< Deferred setup rx queue */
+#define DEV_DEFERRED_TX_QUEUE_SETUP 0x00000002
+/**< Deferred setup tx queue */
+#define DEV_DEFERRED_RX_QUEUE_RELEASE 0x00000004
+/**< Deferred release rx queue */
+#define DEV_DEFERRED_TX_QUEUE_RELEASE 0x00000008
+/**< Deferred release tx queue */
+
 /*
  * If new Tx offload capabilities are defined, they also must be
  * mentioned in rte_tx_offload_names in rte_ethdev.c file.
@@ -1029,6 +1038,8 @@ struct rte_eth_dev_info {
 	/** Configured number of rx/tx queues */
 	uint16_t nb_rx_queues; /**< Number of RX queues. */
 	uint16_t nb_tx_queues; /**< Number of TX queues. */
+	uint64_t deferred_queue_config_capa;
+	/**< queues can be setup/release after dev_start (DEV_DEFERRED_). */
 };
 
 /**
-- 
2.13.6