net/ixgbe: add tuned Rx/Tx parameters

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>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/doc/guides/rel_notes/release_18_08.rst b/doc/guides/rel_notes/release_18_08.rst
index bc01242..cfce71c 100644 (file)
--- a/doc/guides/rel_notes/release_18_08.rst
+++ b/doc/guides/rel_notes/release_18_08.rst
@@ -46,6 +46,14 @@ New Features
   Flow API support has been added to CXGBE Poll Mode Driver to offload
   flows to Chelsio T5/T6 NICs.
 
+* **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 a3ddfe2..4407245 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -3764,6 +3764,14 @@ 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 *