[dpdk-stable] patch 'net/bnx2x: fix transmit queue free threshold' has been queued to LTS release 16.11.2

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

Hi,

FYI, your patch has been queued to LTS release 16.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable
yet. It will be pushed if I get no objections before 04/11/17.
So please shout if anyone has objections.

Thanks.

	--yliu

---
>From a4bd54f9f45ded0453717725d8a3eaebd943a17f Mon Sep 17 00:00:00 2001
From: Chas Williams <ciwillia@brocade.com>
Date: Fri, 10 Feb 2017 15:12:06 -0500
Subject: [PATCH] net/bnx2x: fix transmit queue free threshold

[ upstream commit f078565129809a4737de8eea1b3c4c24f5472c3b ]

The default tx_free_thresh is potentially larger than the allocated queue
which will result in TX queue cleanup never happening.  To fix this,
lower the default free threshold and ensure that the free threshold is
never greater than the maximum outstanding transmit buffers.

Fixes: 827ed2a118cc ("net/bnx2x: restructure Tx routine")

Signed-off-by: Chas Williams <ciwillia@brocade.com>
Acked-by: Harish Patil <harish.patil@qlogic.com>
---
 drivers/net/bnx2x/bnx2x_rxtx.c | 2 ++
 drivers/net/bnx2x/bnx2x_rxtx.h | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bnx2x/bnx2x_rxtx.c b/drivers/net/bnx2x/bnx2x_rxtx.c
index 170e48f..adf0309 100644
--- a/drivers/net/bnx2x/bnx2x_rxtx.c
+++ b/drivers/net/bnx2x/bnx2x_rxtx.c
@@ -273,6 +273,8 @@ bnx2x_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	txq->tx_free_thresh = tx_conf->tx_free_thresh ?
 		tx_conf->tx_free_thresh : DEFAULT_TX_FREE_THRESH;
+	txq->tx_free_thresh = min(txq->tx_free_thresh,
+				  txq->nb_tx_desc - BDS_PER_TX_PKT);
 
 	PMD_INIT_LOG(DEBUG, "fp[%02d] req_bd=%u, thresh=%u, usable_bd=%lu, "
 		     "total_bd=%lu, tx_pages=%u",
diff --git a/drivers/net/bnx2x/bnx2x_rxtx.h b/drivers/net/bnx2x/bnx2x_rxtx.h
index dd251aa..2e38ec2 100644
--- a/drivers/net/bnx2x/bnx2x_rxtx.h
+++ b/drivers/net/bnx2x/bnx2x_rxtx.h
@@ -11,7 +11,7 @@
 #ifndef _BNX2X_RXTX_H_
 #define _BNX2X_RXTX_H_
 
-#define DEFAULT_TX_FREE_THRESH   512
+#define DEFAULT_TX_FREE_THRESH   64
 #define RTE_PMD_BNX2X_TX_MAX_BURST 1
 
 /**
-- 
1.9.0