[PATCH v1] net/ixgbe: add tuned RxTx parmeters

[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 adds the values for the ixgbe PMD.

Signed-off-by: Remy Horton <remy.horton@intel.com>
---
 doc/guides/rel_notes/release_18_08.rst | 8 ++++++++
 drivers/net/ixgbe/ixgbe_ethdev.c       | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/doc/guides/rel_notes/release_18_08.rst b/doc/guides/rel_notes/release_18_08.rst
index 5bc23c5..17e6ff9 100644
--- a/doc/guides/rel_notes/release_18_08.rst
+++ b/doc/guides/rel_notes/release_18_08.rst
@@ -41,6 +41,14 @@ New Features
      Also, make sure to start the actual text at the margin.
      =========================================================
 
+* **Added ixgbe preferred Rx/Tx parameters.**
+
+  Rather than applications providing explicit Rx and Tx parameters such as
+  queue and burst sizes, they can request that the EAL instead uses preferred
+  values provided by the PMD, falling back to defaults within the EAL if the
+  PMD does not provide any. The provision of such tuned values now includes
+  the ixgbe PMD.
+
 
 API Changes
 -----------
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 87d2ad0..95fd080 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -3755,6 +3755,14 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		dev_info->speed_capa |= ETH_LINK_SPEED_2_5G;
 		dev_info->speed_capa |= ETH_LINK_SPEED_5G;
 	}
+
+	/* Driver-preferred Rx/Tx parameters */
+	dev_info->default_rxportconf.burst_size = 32;
+	dev_info->default_txportconf.burst_size = 32;
+	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;
 }
 
 static const uint32_t *
-- 
2.9.5