text: /* SPDX-License-Identifier: BSD-3-Clause
   * Copyright 2015 6WIND S.A.
   * Copyright 2015 Mellanox Technologies, Ltd
   */
  
  #include <unistd.h>
  
  #include <rte_ether.h>
  #include <rte_ethdev_driver.h>
  #include <rte_interrupts.h>
  #include <rte_alarm.h>
  
  #include "mlx5.h"
  #include "mlx5_rxtx.h"
  #include "mlx5_utils.h"
  
  /**
   * Stop traffic on Tx queues.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   */
  static void
  mlx5_txq_stop(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	unsigned int i;
  
  	for (i = 0; i != priv->txqs_n; ++i)
  		mlx5_txq_release(dev, i);
  }
  
  /**
   * Start traffic on Tx queues.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   *
   * @return
   *   0 on success, a negative errno value otherwise and rte_errno is set.
   */
  static int
  mlx5_txq_start(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	unsigned int i;
  	int ret;
  
  	for (i = 0; i != priv->txqs_n; ++i) {
  		struct mlx5_txq_ctrl *txq_ctrl = mlx5_txq_get(dev, i);
  
  		if (!txq_ctrl)
  			continue;
  		txq_alloc_elts(txq_ctrl);
  		txq_ctrl->ibv = mlx5_txq_ibv_new(dev, i);
  		if (!txq_ctrl->ibv) {
  			rte_errno = ENOMEM;
  			goto error;
  		}
  	}
  	return 0;
  error:
  	ret = rte_errno; /* Save rte_errno before cleanup. */
  	do {
  		mlx5_txq_release(dev, i);
  	} while (i-- != 0);
  	rte_errno = ret; /* Restore rte_errno. */
  	return -rte_errno;
  }
  
  /**
   * Stop traffic on Rx queues.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   */
  static void
  mlx5_rxq_stop(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	unsigned int i;
  
  	for (i = 0; i != priv->rxqs_n; ++i)
  		mlx5_rxq_release(dev, i);
  }
  
  /**
   * Start traffic on Rx queues.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   *
   * @return
   *   0 on success, a negative errno value otherwise and rte_errno is set.
   */
  static int
  mlx5_rxq_start(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	unsigned int i;
  	int ret = 0;
  
  	/* Allocate/reuse/resize mempool for Multi-Packet RQ. */
  	if (mlx5_mprq_alloc_mp(dev)) {
  		/* Should not release Rx queues but return immediately. */
  		return -rte_errno;
  	}
  	for (i = 0; i != priv->rxqs_n; ++i) {
  		struct mlx5_rxq_ctrl *rxq_ctrl = mlx5_rxq_get(dev, i);
  		struct rte_mempool *mp;
  
  		if (!rxq_ctrl)
  			continue;
  		/* Pre-register Rx mempool. */
  		mp = mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq) ?
  		     rxq_ctrl->rxq.mprq_mp : rxq_ctrl->rxq.mp;
  		DRV_LOG(DEBUG,
  			"port %u Rx queue %u registering"
  			" mp %s having %u chunks",
  			dev->data->port_id, rxq_ctrl->rxq.idx,
  			mp->name, mp->nb_mem_chunks);
  		mlx5_mr_update_mp(dev, &rxq_ctrl->rxq.mr_ctrl, mp);
  		ret = rxq_alloc_elts(rxq_ctrl);
  		if (ret)
  			goto error;
  		rxq_ctrl->ibv = mlx5_rxq_ibv_new(dev, i);
  		if (!rxq_ctrl->ibv)
  			goto error;
  	}
  	return 0;
  error:
  	ret = rte_errno; /* Save rte_errno before cleanup. */
  	do {
  		mlx5_rxq_release(dev, i);
  	} while (i-- != 0);
  	rte_errno = ret; /* Restore rte_errno. */
  	return -rte_errno;
  }
  
  /**
   * DPDK callback to start the device.
   *
   * Simulate device start by attaching all configured flows.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   *
   * @return
   *   0 on success, a negative errno value otherwise and rte_errno is set.
   */
  int
  mlx5_dev_start(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	int ret;
  
  	DRV_LOG(DEBUG, "port %u starting device", dev->data->port_id);
  	ret = mlx5_txq_start(dev);
  	if (ret) {
  		DRV_LOG(ERR, "port %u Tx queue allocation failed: %s",
  			dev->data->port_id, strerror(rte_errno));
  		return -rte_errno;
  	}
  	ret = mlx5_rxq_start(dev);
  	if (ret) {
  		DRV_LOG(ERR, "port %u Rx queue allocation failed: %s",
  			dev->data->port_id, strerror(rte_errno));
  		mlx5_txq_stop(dev);
  		return -rte_errno;
  	}
  	dev->data->dev_started = 1;
  	ret = mlx5_rx_intr_vec_enable(dev);
  	if (ret) {
  		DRV_LOG(ERR, "port %u Rx interrupt vector creation failed",
  			dev->data->port_id);
  		goto error;
  	}
  	mlx5_stats_init(dev);
  	ret = mlx5_traffic_enable(dev);
  	if (ret) {
  		DRV_LOG(DEBUG, "port %u failed to set defaults flows",
  			dev->data->port_id);
  		goto error;
  	}
  	ret = mlx5_flow_start(dev, &priv->flows);
  	if (ret) {
  		DRV_LOG(DEBUG, "port %u failed to set flows",
  			dev->data->port_id);
  		goto error;
  	}
  	rte_wmb();
  	dev->tx_pkt_burst = mlx5_select_tx_function(dev);
  	dev->rx_pkt_burst = mlx5_select_rx_function(dev);
  	/* Enable datapath on secondary process. */
  	mlx5_mp_req_start_rxtx(dev);
  	mlx5_dev_interrupt_handler_install(dev);
  	return 0;
  error:
  	ret = rte_errno; /* Save rte_errno before cleanup. */
  	/* Rollback. */
  	dev->data->dev_started = 0;
  	mlx5_flow_stop(dev, &priv->flows);
  	mlx5_traffic_disable(dev);
  	mlx5_txq_stop(dev);
  	mlx5_rxq_stop(dev);
  	rte_errno = ret; /* Restore rte_errno. */
  	return -rte_errno;
  }
  
  /**
   * DPDK callback to stop the device.
   *
   * Simulate device stop by detaching all configured flows.
   *
   * @param dev
   *   Pointer to Ethernet device structure.
   */
  void
  mlx5_dev_stop(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  
  	dev->data->dev_started = 0;
  	/* Prevent crashes when queues are still in use. */
  	dev->rx_pkt_burst = removed_rx_burst;
  	dev->tx_pkt_burst = removed_tx_burst;
  	rte_wmb();
  	/* Disable datapath on secondary process. */
  	mlx5_mp_req_stop_rxtx(dev);
  	usleep(1000 * priv->rxqs_n);
  	DRV_LOG(DEBUG, "port %u stopping device", dev->data->port_id);
  	mlx5_flow_stop(dev, &priv->flows);
  	mlx5_traffic_disable(dev);
  	mlx5_rx_intr_vec_disable(dev);
  	mlx5_dev_interrupt_handler_uninstall(dev);
  	mlx5_txq_stop(dev);
  	mlx5_rxq_stop(dev);
  }
  
  /**
   * Enable traffic flows configured by control plane
   *
   * @param dev
   *   Pointer to Ethernet device private data.
   * @param dev
   *   Pointer to Ethernet device structure.
   *
   * @return
   *   0 on success, a negative errno value otherwise and rte_errno is set.
   */
  int
  mlx5_traffic_enable(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  	struct rte_flow_item_eth bcast = {
  		.dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
  	};
  	struct rte_flow_item_eth ipv6_multi_spec = {
  		.dst.addr_bytes = "\x33\x33\x00\x00\x00\x00",
  	};
  	struct rte_flow_item_eth ipv6_multi_mask = {
  		.dst.addr_bytes = "\xff\xff\x00\x00\x00\x00",
  	};
  	struct rte_flow_item_eth unicast = {
  		.src.addr_bytes = "\x00\x00\x00\x00\x00\x00",
  	};
  	struct rte_flow_item_eth unicast_mask = {
  		.dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
  	};
  	const unsigned int vlan_filter_n = priv->vlan_filter_n;
  	const struct ether_addr cmp = {
  		.addr_bytes = "\x00\x00\x00\x00\x00\x00",
  	};
  	unsigned int i;
  	unsigned int j;
  	int ret;
  
  	if (priv->isolated)
  		return 0;
  	if (dev->data->promiscuous) {
  		struct rte_flow_item_eth promisc = {
  			.dst.addr_bytes = "\x00\x00\x00\x00\x00\x00",
  			.src.addr_bytes = "\x00\x00\x00\x00\x00\x00",
  			.type = 0,
  		};
  
  		ret = mlx5_ctrl_flow(dev, &promisc, &promisc);
  		if (ret)
  			goto error;
  	}
  	if (dev->data->all_multicast) {
  		struct rte_flow_item_eth multicast = {
  			.dst.addr_bytes = "\x01\x00\x00\x00\x00\x00",
  			.src.addr_bytes = "\x00\x00\x00\x00\x00\x00",
  			.type = 0,
  		};
  
  		ret = mlx5_ctrl_flow(dev, &multicast, &multicast);
  		if (ret)
  			goto error;
  	} else {
  		/* Add broadcast/multicast flows. */
  		for (i = 0; i != vlan_filter_n; ++i) {
  			uint16_t vlan = priv->vlan_filter[i];
  
  			struct rte_flow_item_vlan vlan_spec = {
  				.tci = rte_cpu_to_be_16(vlan),
  			};
  			struct rte_flow_item_vlan vlan_mask =
  				rte_flow_item_vlan_mask;
  
  			ret = mlx5_ctrl_flow_vlan(dev, &bcast, &bcast,
  						  &vlan_spec, &vlan_mask);
  			if (ret)
  				goto error;
  			ret = mlx5_ctrl_flow_vlan(dev, &ipv6_multi_spec,
  						  &ipv6_multi_mask,
  						  &vlan_spec, &vlan_mask);
  			if (ret)
  				goto error;
  		}
  		if (!vlan_filter_n) {
  			ret = mlx5_ctrl_flow(dev, &bcast, &bcast);
  			if (ret)
  				goto error;
  			ret = mlx5_ctrl_flow(dev, &ipv6_multi_spec,
  					     &ipv6_multi_mask);
  			if (ret)
  				goto error;
  		}
  	}
  	/* Add MAC address flows. */
  	for (i = 0; i != MLX5_MAX_MAC_ADDRESSES; ++i) {
  		struct ether_addr *mac = &dev->data->mac_addrs[i];
  
  		if (!memcmp(mac, &cmp, sizeof(*mac)))
  			continue;
  		memcpy(&unicast.dst.addr_bytes,
  		       mac->addr_bytes,
  		       ETHER_ADDR_LEN);
  		for (j = 0; j != vlan_filter_n; ++j) {
  			uint16_t vlan = priv->vlan_filter[j];
  
  			struct rte_flow_item_vlan vlan_spec = {
  				.tci = rte_cpu_to_be_16(vlan),
  			};
  			struct rte_flow_item_vlan vlan_mask =
  				rte_flow_item_vlan_mask;
  
  			ret = mlx5_ctrl_flow_vlan(dev, &unicast,
  						  &unicast_mask,
  						  &vlan_spec,
  						  &vlan_mask);
  			if (ret)
  				goto error;
  		}
  		if (!vlan_filter_n) {
  			ret = mlx5_ctrl_flow(dev, &unicast, &unicast_mask);
  			if (ret)
  				goto error;
  		}
  	}
  	return 0;
  error:
  	ret = rte_errno; /* Save rte_errno before cleanup. */
  	mlx5_flow_list_flush(dev, &priv->ctrl_flows);
  	rte_errno = ret; /* Restore rte_errno. */
  	return -rte_errno;
  }
  
  
  /**
   * Disable traffic flows configured by control plane
   *
   * @param dev
   *   Pointer to Ethernet device private data.
   */
  void
  mlx5_traffic_disable(struct rte_eth_dev *dev)
  {
  	struct mlx5_priv *priv = dev->data->dev_private;
  
  	mlx5_flow_list_flush(dev, &priv->ctrl_flows);
  }
  
  /**
   * Restart traffic flows configured by control plane
   *
   * @param dev
   *   Pointer to Ethernet device private data.
   *
   * @return
   *   0 on success, a negative errno value otherwise and rte_errno is set.
   */
  int
  mlx5_traffic_restart(struct rte_eth_dev *dev)
  {
  	if (dev->data->dev_started) {
  		mlx5_traffic_disable(dev);
  		return mlx5_traffic_enable(dev);
  	}
  	return 0;
  }
  