[dpdk-dev] [PATCH v7 1/5] ethdev: support runtime queue setup

[Qi Zhang]

It's not possible to setup a queue when the port is started
because of a check in ethdev layer. New capability flags are
added in order to relax this check for devices which support
queue setup in runtime. The functions rte_eth_[rx|tx]_queue_setup
will raise an error only if the port is started and runtime setup
of queue is not supported.

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---

v7:
- update default.init
- rename runtime_queue_setup_capa to dev_capa for generic.
- fix typo.

v6:
- fix tx queue state check in rte_eth_tx_queue_setup


 doc/guides/nics/features.rst         | 18 ++++++++++++++++++
 doc/guides/nics/features/default.ini |  2 ++
 lib/librte_ether/rte_ethdev.c        | 30 ++++++++++++++++++------------
 lib/librte_ether/rte_ethdev.h        |  7 +++++++
 4 files changed, 45 insertions(+), 12 deletions(-)

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 1b4fb979f..67d459f80 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -892,7 +892,25 @@ Documentation describes performance values.
 
 See ``dpdk.org/doc/perf/*``.
 
+.. _nic_features_runtime_rx_queue_setup:
 
+Runtime Rx queue setup
+----------------------
+
+Supports Rx queue setup after device started.
+
+* **[provides] rte_eth_dev_info**: ``dev_capa:DEV_CAPA_RUNTIME_RX_QUEUE_SETUP``.
+* **[related]  API**: ``rte_eth_dev_info_get()``.
+
+.. _nic_features_runtime_tx_queue_setup:
+
+Runtime Tx queue setup
+----------------------
+
+Supports Tx queue setup after device started.
+
+* **[provides] rte_eth_dev_info**: ``dev_capa:DEV_CAPA_RUNTIME_TX_QUEUE_SETUP``.
+* **[related]  API**: ``rte_eth_dev_info_get()``.
 
 .. _nic_features_other:
 
diff --git a/doc/guides/nics/features/default.ini b/doc/guides/nics/features/default.ini
index dae2ad776..dae80d52f 100644
--- a/doc/guides/nics/features/default.ini
+++ b/doc/guides/nics/features/default.ini
@@ -78,3 +78,5 @@ x86-64               =
 Usage doc            =
 Design doc           =
 Perf doc             =
+Runtime Rx queue setup =
+Runtime Tx queue setup =
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 54d6bf355..dd8e38dfa 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1413,12 +1413,6 @@ 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);
 
@@ -1470,6 +1464,15 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.dev_capa &
+			DEV_CAPA_RUNTIME_RX_QUEUE_SETUP))
+		return -EBUSY;
+
+	if (dev->data->rx_queue_state[rx_queue_id] !=
+		RTE_ETH_QUEUE_STATE_STOPPED)
+		return -EBUSY;
+
 	rxq = dev->data->rx_queues;
 	if (rxq[rx_queue_id]) {
 		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_release,
@@ -1545,12 +1548,6 @@ 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);
 
@@ -1575,6 +1572,15 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.dev_capa &
+			DEV_CAPA_RUNTIME_TX_QUEUE_SETUP))
+		return -EBUSY;
+
+	if (dev->data->tx_queue_state[tx_queue_id] !=
+		RTE_ETH_QUEUE_STATE_STOPPED)
+		return -EBUSY;
+
 	txq = dev->data->tx_queues;
 	if (txq[tx_queue_id]) {
 		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_release,
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 7e4e57b3c..c775a64a1 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -981,6 +981,11 @@ struct rte_eth_conf {
  */
 #define DEV_TX_OFFLOAD_SECURITY         0x00020000
 
+#define DEV_CAPA_RUNTIME_RX_QUEUE_SETUP 0x00000001
+/**< Device supports Rx queue setup after device started*/
+#define DEV_CAPA_RUNTIME_TX_QUEUE_SETUP 0x00000002
+/**< Device supports Tx queue setup after device started*/
+
 /*
  * If new Tx offload capabilities are defined, they also must be
  * mentioned in rte_tx_offload_names in rte_ethdev.c file.
@@ -1054,6 +1059,8 @@ struct rte_eth_dev_info {
 	struct rte_eth_dev_portconf default_rxportconf;
 	/** Tx parameter recommendations */
 	struct rte_eth_dev_portconf default_txportconf;
+	/** Generic device capabilities */
+	uint64_t dev_capa;
 };
 
 /**
-- 
2.13.6