[dpdk-dev] [PATCH v2 3/4] net/i40e: add TxRx tuning parameters

[Remy Horton]

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.hor...@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 508b417..7be00ad 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -3248,15 +3248,42 @@ i40e_dev_info_get(struct rte_eth_dev *dev, struct 
rte_eth_dev_info *dev_info)
                dev_info->max_tx_queues += dev_info->vmdq_queue_num;
        }
 
-       if (I40E_PHY_TYPE_SUPPORT_40G(hw->phy.phy_types))
+       if (I40E_PHY_TYPE_SUPPORT_40G(hw->phy.phy_types)) {
                /* For XL710 */
                dev_info->speed_capa = ETH_LINK_SPEED_40G;
-       else if (I40E_PHY_TYPE_SUPPORT_25G(hw->phy.phy_types))
+               dev_info->default_rxportconf.nb_queues = 2;
+               dev_info->default_txportconf.nb_queues = 2;
+               if (dev->data->nb_rx_queues == 1)
+                       dev_info->default_rxportconf.ring_size = 2048;
+               else
+                       dev_info->default_rxportconf.ring_size = 1024;
+               if (dev->data->nb_tx_queues == 1)
+                       dev_info->default_txportconf.ring_size = 1024;
+               else
+                       dev_info->default_txportconf.ring_size = 512;
+
+       } else if (I40E_PHY_TYPE_SUPPORT_25G(hw->phy.phy_types)) {
                /* For XXV710 */
                dev_info->speed_capa = ETH_LINK_SPEED_25G;
-       else
+               dev_info->default_rxportconf.nb_queues = 1;
+               dev_info->default_txportconf.nb_queues = 1;
+               dev_info->default_rxportconf.ring_size = 256;
+               dev_info->default_txportconf.ring_size = 256;
+       } else {
                /* For X710 */
                dev_info->speed_capa = ETH_LINK_SPEED_1G | ETH_LINK_SPEED_10G;
+               dev_info->default_rxportconf.nb_queues = 1;
+               dev_info->default_txportconf.nb_queues = 1;
+               if (dev->data->dev_conf.link_speeds & ETH_LINK_SPEED_10G) {
+                       dev_info->default_rxportconf.ring_size = 512;
+                       dev_info->default_txportconf.ring_size = 256;
+               } else {
+                       dev_info->default_rxportconf.ring_size = 256;
+                       dev_info->default_txportconf.ring_size = 256;
+               }
+       }
+       dev_info->default_rxportconf.burst_size = 32;
+       dev_info->default_txportconf.burst_size = 32;
 }
 
 static int
-- 
2.9.5