[dpdk-dev] [PATCH v3 1/4] net/bond: calculate number of bonding tx/rx queues

[Declan Doherty]

Fixes: 2efb58cb ("bond: new link bonding library")

This patch fixes the maximum number of tx an rx queues supported by a
bonding device return by the rte_eth_dev_info_get function. The bonding
device now calculates the maximum number of supported tx and rx queues
based on the slaves bound to the bonded device, with the minimum values
of tx and rx queues from the device slaves being the bonded devices
maximum, as each slave must be able to support the same number of tx
and rx queues.

Signed-off-by: Declan Doherty <declan.doherty at intel.com>
---
 drivers/net/bonding/rte_eth_bond_pmd.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index dccc016..f428e96 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1691,6 +1691,8 @@ static void
 bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 {
 	struct bond_dev_private *internals = dev->data->dev_private;
+	uint16_t max_nb_rx_queues = UINT16_MAX;
+	uint16_t max_nb_tx_queues = UINT16_MAX;
 
 	dev_info->max_mac_addrs = 1;
 
@@ -1698,8 +1700,29 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 				  ? internals->candidate_max_rx_pktlen
 				  : ETHER_MAX_JUMBO_FRAME_LEN;
 
-	dev_info->max_rx_queues = (uint16_t)128;
-	dev_info->max_tx_queues = (uint16_t)512;
+	if (internals->slave_count > 0) {
+		/* Max number of tx/rx queues that the bonded device can
+		 * support is the minimum values of the bonded slaves, as
+		 * all slaves must be capable of supporting the same number
+		 * of tx/rx queues.
+		 */
+		struct rte_eth_dev_info slave_info;
+		uint8_t idx;
+
+		for (idx = 0; idx < internals->slave_count; idx++) {
+			rte_eth_dev_info_get(internals->slaves[idx].port_id,
+					&slave_info);
+
+			if (slave_info.max_rx_queues < max_nb_rx_queues)
+				max_nb_rx_queues = slave_info.max_rx_queues;
+
+			if (slave_info.max_tx_queues < max_nb_tx_queues)
+				max_nb_tx_queues = slave_info.max_tx_queues;
+		}
+	}
+
+	dev_info->max_rx_queues = max_nb_rx_queues;
+	dev_info->max_tx_queues = max_nb_tx_queues;
 
 	dev_info->min_rx_bufsize = 0;
 
-- 
2.9.4