[PATCH 1/3] net/i40e: implement VF reset

[luca.boccassi@gmail.com]

From: Luca Boccassi <bluca@debian.org>

This reset function will detach then re-attach the device, reconfigure
it, and re-setup the Rx/Tx queues.

Signed-off-by: Luca Boccassi <bluca@debian.org>
---
 drivers/net/i40e/i40e_ethdev.h    |  3 +++
 drivers/net/i40e/i40e_ethdev_vf.c | 56 ++++++++++++++++++++++++++++++++++++---
 drivers/net/i40e/i40e_rxtx.c      | 11 ++++++++
 drivers/net/i40e/i40e_rxtx.h      |  4 +++
 4 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 2f1905e13..45714959a 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -1047,6 +1047,9 @@ struct i40e_adapter {
 	struct rte_timecounter rx_tstamp_tc;
 	struct rte_timecounter tx_tstamp_tc;
 
+	/* For VF reset */
+	uint8_t reset_number;
+
 	/* ptype mapping table */
 	uint32_t ptype_tbl[I40E_MAX_PKT_TYPE] __rte_cache_min_aligned;
 	/* flow type to pctype mapping table */
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 9f1487509..333ddb4ca 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -2294,21 +2294,69 @@ i40evf_dev_close(struct rte_eth_dev *dev)
 	i40evf_disable_irq0(hw);
 }
 
-/*
- * Reset VF device only to re-initialize resources in PMD layer
- */
+static void
+i40e_vf_queue_reset(struct rte_eth_dev *dev)
+{
+	uint16_t i;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		 struct i40e_rx_queue *rxq = dev->data->rx_queues[i];
+
+		 if (rxq->q_set) {
+			  i40e_dev_rx_queue_setup(dev,
+						     rxq->queue_id,
+						     rxq->nb_rx_desc,
+						     rxq->socket_id,
+						     &rxq->rxconf,
+						     rxq->mp);
+		 }
+	}
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		 struct i40e_tx_queue *txq = dev->data->tx_queues[i];
+
+		 if (txq->q_set) {
+			  i40e_dev_tx_queue_setup(dev,
+						     txq->queue_id,
+						     txq->nb_tx_desc,
+						     txq->socket_id,
+						     &txq->txconf);
+		 }
+	}
+}
+
 static int
 i40evf_dev_reset(struct rte_eth_dev *dev)
 {
 	int ret;
+	struct i40e_adapter *adapter =
+		 I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 
+	if (!dev->data->dev_started)
+		 return -EAGAIN;
+
+	adapter->reset_number = 1;
+	i40evf_dev_close(dev);
+	PMD_DRV_LOG(DEBUG, "i40evf dev close complete");
 	ret = i40evf_dev_uninit(dev);
 	if (ret)
 		return ret;
+	PMD_DRV_LOG(DEBUG, "i40evf dev detached");
+	memset(dev->data->dev_private, 0,
+		(uint64_t)&adapter->reset_number - (uint64_t)adapter);
 
+	i40evf_dev_configure(dev);
 	ret = i40evf_dev_init(dev);
+	if (ret)
+		return ret;
+	PMD_DRV_LOG(DEBUG, "i40evf dev attached");
 
-	return ret;
+	i40e_vf_queue_reset(dev);
+	PMD_DRV_LOG(DEBUG, "i40evf queue reset");
+	i40evf_dev_start(dev);
+	PMD_DRV_LOG(DEBUG, "i40evf dev restart");
+	adapter->reset_number = 0;
+
+	return 0;
 }
 
 static int
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index f21c1c5d2..3d5125260 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -1745,6 +1745,7 @@ i40e_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	uint32_t ring_size;
 	uint16_t len, i;
 	uint16_t reg_idx, base, bsf, tc_mapping;
+	struct rte_eth_rxconf conf = *rx_conf;
 	int q_offset, use_def_burst_func = 1;
 
 	if (hw->mac.type == I40E_MAC_VF || hw->mac.type == I40E_MAC_X722_VF) {
@@ -1789,6 +1790,8 @@ i40e_dev_rx_queue_setup(struct rte_eth_dev *dev,
 		return -ENOMEM;
 	}
 	rxq->mp = mp;
+	rxq->socket_id = socket_id;
+	rxq->rxconf = conf;
 	rxq->nb_rx_desc = nb_desc;
 	rxq->rx_free_thresh = rx_conf->rx_free_thresh;
 	rxq->queue_id = queue_idx;
@@ -2024,6 +2027,8 @@ i40e_dev_tx_queue_setup(struct rte_eth_dev *dev,
 	uint16_t reg_idx, i, base, bsf, tc_mapping;
 	int q_offset;
 
+	struct rte_eth_txconf conf = *tx_conf;
+
 	if (hw->mac.type == I40E_MAC_VF || hw->mac.type == I40E_MAC_X722_VF) {
 		vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 		vsi = &vf->vsi;
@@ -2149,6 +2154,8 @@ i40e_dev_tx_queue_setup(struct rte_eth_dev *dev,
 	}
 
 	txq->nb_tx_desc = nb_desc;
+	txq->socket_id = socket_id;
+	txq->txconf = conf;
 	txq->tx_rs_thresh = tx_rs_thresh;
 	txq->tx_free_thresh = tx_free_thresh;
 	txq->pthresh = tx_conf->tx_thresh.pthresh;
@@ -2628,8 +2635,12 @@ void
 i40e_dev_free_queues(struct rte_eth_dev *dev)
 {
 	uint16_t i;
+	struct i40e_adapter *adapter =
+		I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 
 	PMD_INIT_FUNC_TRACE();
+	if (adapter->reset_number)
+		return;
 
 	for (i = 0; i < dev->data->nb_rx_queues; i++) {
 		if (!dev->data->rx_queues[i])
diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
index 06c6a6592..43e227a52 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -136,6 +136,8 @@ struct i40e_rx_queue {
 	bool rx_deferred_start; /**< don't start this queue in dev start */
 	uint16_t rx_using_sse; /**<flag indicate the usage of vPMD for rx */
 	uint8_t dcb_tc;         /**< Traffic class of rx queue */
+	uint8_t socket_id;
+	struct rte_eth_rxconf rxconf;
 };
 
 struct i40e_tx_entry {
@@ -177,6 +179,8 @@ struct i40e_tx_queue {
 	bool q_set; /**< indicate if tx queue has been configured */
 	bool tx_deferred_start; /**< don't start this queue in dev start */
 	uint8_t dcb_tc;         /**< Traffic class of tx queue */
+	uint8_t socket_id;
+	struct rte_eth_txconf txconf;
 };
 
 /** Offload features */
-- 
2.11.0