[RFC PATCH v1 2/4] net/e1000: add TxRx tuning parameters

[Remy Horton <remy.horton@intel.com>]

The optimal values of several transmission & reception related
parameters, such as burst sizes, descriptor ring sizes, and number
of queues, varies between different network interface devices. This
patch allows individual PMDs to specify preferred parameter values.

Signed-off-by: Remy Horton <remy.horton@intel.com>
---
 drivers/net/e1000/em_ethdev.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index 242375f..e81abd1 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -1099,6 +1099,8 @@ static void
 eth_em_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 {
 	struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct rte_eth_dev_pref_queue_info *pref_q_info =
+		&dev_info->preferred_queue_values;
 
 	dev_info->pci_dev = RTE_ETH_DEV_TO_PCI(dev);
 	dev_info->min_rx_bufsize = 256; /* See BSIZE field of RCTL register. */
@@ -1152,6 +1154,12 @@ eth_em_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 	dev_info->speed_capa = ETH_LINK_SPEED_10M_HD | ETH_LINK_SPEED_10M |
 			ETH_LINK_SPEED_100M_HD | ETH_LINK_SPEED_100M |
 			ETH_LINK_SPEED_1G;
+
+	/* Preferred queue parameters */
+	pref_q_info->nb_tx_queues = 1;
+	pref_q_info->nb_rx_queues = 1;
+	pref_q_info->tx_ring_size = 256;
+	pref_q_info->rx_ring_size = 256;
 }
 
 /* return 0 means link status changed, -1 means not changed */
-- 
2.9.5