[dpdk-dev] [PATCH] igb: set default thresholds correctly based on mac type

[Stephen Hemminger <stephen@networkplumber.org>]

This brings the DPDK igb driver inline with the behavior used by
the current Linux driver. The IGB hardware has several different
MAC types and the threshold values that work vary based on the hardware.

Since DPDK 1.8 it has been up to devices to provide the correct default
configuration parameter. But the igb driver gives values that are broken
on some devices, and always causes a warning message at startup.

Please test this on real hardware, I don't have the luxury of a
hardware lab full of variations of this chip.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/e1000/igb_ethdev.c | 11 ++++++-----
 drivers/net/e1000/igb_rxtx.c   |  8 ++++----
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index d1bbcda..31b2c1f 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -61,13 +61,14 @@
  * Default values for port configuration
  */
 #define IGB_DEFAULT_RX_FREE_THRESH  32
-#define IGB_DEFAULT_RX_PTHRESH      8
+
+#define IGB_DEFAULT_RX_PTHRESH      ((hw->mac.type == e1000_i354) ? 12 : 8)
 #define IGB_DEFAULT_RX_HTHRESH      8
-#define IGB_DEFAULT_RX_WTHRESH      0
+#define IGB_DEFAULT_RX_WTHRESH      ((hw->mac.type == e1000_82576) ? 1 : 4)
 
-#define IGB_DEFAULT_TX_PTHRESH      32
-#define IGB_DEFAULT_TX_HTHRESH      0
-#define IGB_DEFAULT_TX_WTHRESH      0
+#define IGB_DEFAULT_TX_PTHRESH      ((hw->mac.type == e1000_i354) ? 20: 8)
+#define IGB_DEFAULT_TX_HTHRESH      1
+#define IGB_DEFAULT_TX_WTHRESH      ((hw->mac.type == e1000_82576) ? 1 : 16)
 
 #define IGB_HKEY_MAX_INDEX 10
 
diff --git a/drivers/net/e1000/igb_rxtx.c b/drivers/net/e1000/igb_rxtx.c
index 996e7da..499b6b4 100644
--- a/drivers/net/e1000/igb_rxtx.c
+++ b/drivers/net/e1000/igb_rxtx.c
@@ -1315,13 +1315,13 @@ eth_igb_tx_queue_setup(struct rte_eth_dev *dev,
 	 * driver.
 	 */
 	if (tx_conf->tx_free_thresh != 0)
-		PMD_INIT_LOG(WARNING, "The tx_free_thresh parameter is not "
+		PMD_INIT_LOG(INFO, "The tx_free_thresh parameter is not "
 			     "used for the 1G driver.");
 	if (tx_conf->tx_rs_thresh != 0)
-		PMD_INIT_LOG(WARNING, "The tx_rs_thresh parameter is not "
+		PMD_INIT_LOG(INFO, "The tx_rs_thresh parameter is not "
 			     "used for the 1G driver.");
-	if (tx_conf->tx_thresh.wthresh == 0)
-		PMD_INIT_LOG(WARNING, "To improve 1G driver performance, "
+	if (tx_conf->tx_thresh.wthresh == 0 && hw->mac.type != e1000_82576)
+		PMD_INIT_LOG(INFO, "To improve 1G driver performance, "
 			     "consider setting the TX WTHRESH value to 4, 8, "
 			     "or 16.");
 
-- 
2.1.4