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igb: set default thresholds based on MAC type

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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>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
This commit is contained in:
Stephen Hemminger 2016-01-21 17:38:37 -08:00 committed by Thomas Monjalon
parent 8361d1ccdd
commit 4a41c17dba
2 changed files with 11 additions and 10 deletions
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13
drivers/net/e1000/igb_ethdev.c
View File

@ -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_HTHRESH 8
#define IGB_DEFAULT_RX_WTHRESH 0
#define IGB_DEFAULT_TX_PTHRESH 32
#define IGB_DEFAULT_TX_HTHRESH 0
#define IGB_DEFAULT_TX_WTHRESH 0
#define IGB_DEFAULT_RX_PTHRESH ((hw->mac.type == e1000_i354) ? 12 : 8)
#define IGB_DEFAULT_RX_HTHRESH 8
#define IGB_DEFAULT_RX_WTHRESH ((hw->mac.type == e1000_82576) ? 1 : 4)
#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

8
drivers/net/e1000/igb_rxtx.c
View File

@ -1309,13 +1309,13 @@ 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.");