Re: [dpdk-dev] [PATCH v5 1/3] ether: support runtime queue setup

["Rosen, Rami" <rami.rosen@intel.com>]

Hi Qi,
Thanks for these patches.
See my comment below.

-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Qi Zhang
Sent: Monday, April 02, 2018 06:00
To: thomas@monjalon.net; Ananyev, Konstantin <konstantin.ananyev@intel.com>
Cc: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>
Subject: [dpdk-dev] [PATCH v5 1/3] ether: support runtime queue setup

The patch let etherdev driver expose the capability flag through rte_eth_dev_info_get when it support runtime 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@intel.com>
---
 doc/guides/nics/features.rst  |  8 ++++++++  lib/librte_ether/rte_ethdev.c | 30 ++++++++++++++++++------------  lib/librte_ether/rte_ethdev.h |  7 +++++++
 3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst index 1b4fb979f..6983faa4e 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_runtime_setup_capabilities:
 
+Queue runtime setup capabilities
+---------------------------------
+
+Supports queue setup / release after device started.
+
+* **[provides] rte_eth_dev_info**: ``runtime_queue_config_capa:DEV_RUNTIME_RX_QUEUE_SETUP,DEV_RUNTIME_TX_QUEUE_SETUP``.
+* **[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 0590f0c10..343b1a6c0 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);
 
@@ -1474,6 +1468,15 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.runtime_queue_setup_capa &
+			DEV_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,
@@ -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);
 
@@ -1596,6 +1593,15 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
 		return -EINVAL;
 	}
 
+	if (dev->data->dev_started &&
+		!(dev_info.runtime_queue_setup_capa &
+			DEV_RUNTIME_TX_QUEUE_SETUP))
+		return -EBUSY;
+
[Rami Rosen] Shouldn't it be here: dev->data->tx_queue_state[...] instead of:
                        dev->data->rx_queue_state[...] ? we are dealing with the TX queue.

+	if (dev->data->rx_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 036153306..4e2088458 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_RUNTIME_RX_QUEUE_SETUP 0x00000001 /**< Deferred setup rx 
+queue */ #define DEV_RUNTIME_TX_QUEUE_SETUP 0x00000002 /**< Deferred 
+setup 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 +1034,8 @@ 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 runtime_queue_setup_capa;
+	/**< queues can be setup after dev_start (DEV_DEFERRED_). */
 };
 
 /**
--
2.13.6