[dpdk-dev] [PATCH 2/2] net/bonding: inherit descriptor limits from slaves

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

Descriptor limits are used by applications to take
optimal decisions on queue sizing.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/bonding/rte_eth_bond_api.c     | 54 ++++++++++++++++++++++
 drivers/net/bonding/rte_eth_bond_pmd.c     |  8 ++++
 drivers/net/bonding/rte_eth_bond_private.h |  2 +
 3 files changed, 64 insertions(+)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index 206a5c797..9e039e73b 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -399,6 +399,43 @@ eth_bond_slave_inherit_dev_info_tx_next(struct bond_dev_private *internals,
 			     internals->tx_queue_offload_capa;
 }
 
+static void
+eth_bond_slave_inherit_desc_lim_first(struct rte_eth_desc_lim *bond_desc_lim,
+		const struct rte_eth_desc_lim *slave_desc_lim)
+{
+	memcpy(bond_desc_lim, slave_desc_lim, sizeof(*bond_desc_lim));
+}
+
+static int
+eth_bond_slave_inherit_desc_lim_next(struct rte_eth_desc_lim *bond_desc_lim,
+		const struct rte_eth_desc_lim *slave_desc_lim)
+{
+	bond_desc_lim->nb_max = RTE_MIN(bond_desc_lim->nb_max,
+					slave_desc_lim->nb_max);
+	bond_desc_lim->nb_min = RTE_MAX(bond_desc_lim->nb_min,
+					slave_desc_lim->nb_min);
+	bond_desc_lim->nb_align = RTE_MAX(bond_desc_lim->nb_align,
+					  slave_desc_lim->nb_align);
+
+	if (bond_desc_lim->nb_min > bond_desc_lim->nb_max ||
+	    bond_desc_lim->nb_align > bond_desc_lim->nb_max) {
+		RTE_BOND_LOG(ERR, "Failed to inherit descriptor limits");
+		return -EINVAL;
+	}
+
+	/* Treat maximum number of segments equal to 0 as unspecified */
+	if (slave_desc_lim->nb_seg_max != 0 &&
+	    (bond_desc_lim->nb_seg_max == 0 ||
+	     slave_desc_lim->nb_seg_max < bond_desc_lim->nb_seg_max))
+		bond_desc_lim->nb_seg_max = slave_desc_lim->nb_seg_max;
+	if (slave_desc_lim->nb_mtu_seg_max != 0 &&
+	    (bond_desc_lim->nb_mtu_seg_max == 0 ||
+	     slave_desc_lim->nb_mtu_seg_max < bond_desc_lim->nb_mtu_seg_max))
+		bond_desc_lim->nb_mtu_seg_max = slave_desc_lim->nb_mtu_seg_max;
+
+	return 0;
+}
+
 static int
 __eth_bond_slave_add_lock_free(uint16_t bonded_port_id, uint16_t slave_port_id)
 {
@@ -458,9 +495,26 @@ __eth_bond_slave_add_lock_free(uint16_t bonded_port_id, uint16_t slave_port_id)
 
 		eth_bond_slave_inherit_dev_info_rx_first(internals, &dev_info);
 		eth_bond_slave_inherit_dev_info_tx_first(internals, &dev_info);
+
+		eth_bond_slave_inherit_desc_lim_first(&internals->rx_desc_lim,
+						      &dev_info.rx_desc_lim);
+		eth_bond_slave_inherit_desc_lim_first(&internals->tx_desc_lim,
+						      &dev_info.tx_desc_lim);
 	} else {
+		int ret;
+
 		eth_bond_slave_inherit_dev_info_rx_next(internals, &dev_info);
 		eth_bond_slave_inherit_dev_info_tx_next(internals, &dev_info);
+
+		ret = eth_bond_slave_inherit_desc_lim_next(
+				&internals->rx_desc_lim, &dev_info.rx_desc_lim);
+		if (ret != 0)
+			return ret;
+
+		ret = eth_bond_slave_inherit_desc_lim_next(
+				&internals->tx_desc_lim, &dev_info.tx_desc_lim);
+		if (ret != 0)
+			return ret;
 	}
 
 	bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf &=
diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index ee24e9658..46b660396 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -2239,6 +2239,11 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 	memcpy(&dev_info->default_txconf, &internals->default_txconf,
 	       sizeof(dev_info->default_txconf));
 
+	memcpy(&dev_info->rx_desc_lim, &internals->rx_desc_lim,
+	       sizeof(dev_info->rx_desc_lim));
+	memcpy(&dev_info->tx_desc_lim, &internals->tx_desc_lim,
+	       sizeof(dev_info->tx_desc_lim));
+
 	/**
 	 * If dedicated hw queues enabled for link bonding device in LACP mode
 	 * then we need to reduce the maximum number of data path queues by 1.
@@ -3064,6 +3069,9 @@ bond_alloc(struct rte_vdev_device *dev, uint8_t mode)
 	memset(&internals->default_txconf, 0,
 	       sizeof(internals->default_txconf));
 
+	memset(&internals->rx_desc_lim, 0, sizeof(internals->rx_desc_lim));
+	memset(&internals->tx_desc_lim, 0, sizeof(internals->tx_desc_lim));
+
 	memset(internals->active_slaves, 0, sizeof(internals->active_slaves));
 	memset(internals->slaves, 0, sizeof(internals->slaves));
 
diff --git a/drivers/net/bonding/rte_eth_bond_private.h b/drivers/net/bonding/rte_eth_bond_private.h
index d12a0ebbe..c81baa094 100644
--- a/drivers/net/bonding/rte_eth_bond_private.h
+++ b/drivers/net/bonding/rte_eth_bond_private.h
@@ -162,6 +162,8 @@ struct bond_dev_private {
 
 	struct rte_eth_rxconf default_rxconf;	/**< Default RxQ conf. */
 	struct rte_eth_txconf default_txconf;	/**< Default TxQ conf. */
+	struct rte_eth_desc_lim rx_desc_lim;	/**< Rx descriptor limits */
+	struct rte_eth_desc_lim tx_desc_lim;	/**< Tx descriptor limits */
 
 	uint16_t reta_size;
 	struct rte_eth_rss_reta_entry64 reta_conf[ETH_RSS_RETA_SIZE_512 /
-- 
2.17.1