[PATCH] net/ixgbe: fix min Rx/Tx descriptors

[Mingjin Ye]

The minimum free packet threshold (tx_free_thresh) and the minimum RS bit
threshold (tx_rs_thresh) both have a default value of 32. Therefore, the
default minimum number of ring descriptors value is 64.

Fixes: dee5f1fd5fc7 ("ixgbe: get queue info and descriptor limits")
Cc: stable at dpdk.org

Signed-off-by: Mingjin Ye <mingjinx.ye at intel.com>
---
 doc/guides/nics/ixgbe.rst            | 2 +-
 drivers/net/intel/ixgbe/ixgbe_rxtx.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst
index c5c6a6c34b..10a0cdd270 100644
--- a/doc/guides/nics/ixgbe.rst
+++ b/doc/guides/nics/ixgbe.rst
@@ -76,7 +76,7 @@ Scattered packets are not supported in this mode.
 If an incoming packet is greater than the maximum acceptable length of one "mbuf" data size (by default, the size is 2 KB),
 vPMD for RX would be disabled.
 
-By default, IXGBE_MAX_RING_DESC is set to 8192 and RTE_PMD_IXGBE_RX_MAX_BURST is set to 32.
+By default, IXGBE_MAX_RING_DESC is set to 8192 and RTE_PMD_IXGBE_RX_MAX_BURST is set to 64.
 
 Windows Prerequisites and Pre-conditions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/drivers/net/intel/ixgbe/ixgbe_rxtx.h b/drivers/net/intel/ixgbe/ixgbe_rxtx.h
index 278f665108..54569c7ade 100644
--- a/drivers/net/intel/ixgbe/ixgbe_rxtx.h
+++ b/drivers/net/intel/ixgbe/ixgbe_rxtx.h
@@ -26,7 +26,7 @@
  * descriptors should meet the following condition:
  *      (num_ring_desc * sizeof(rx/tx descriptor)) % 128 == 0
  */
-#define	IXGBE_MIN_RING_DESC	32
+#define	IXGBE_MIN_RING_DESC	64
 #define	IXGBE_MAX_RING_DESC	8192
 
 #define RTE_PMD_IXGBE_TX_MAX_BURST 32
-- 
2.25.1