[dpdk-stable] patch 'net/iavf: fix Tx context descriptor' has been queued to stable release 19.11.9

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 19.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 06/12/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/cpaelzer/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/cpaelzer/dpdk-stable-queue/commit/3cda8f66ab6771d80766dc25f0464bca03962d79

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From 3cda8f66ab6771d80766dc25f0464bca03962d79 Mon Sep 17 00:00:00 2001
From: Beilei Xing <beilei.xing at intel.com>
Date: Wed, 12 May 2021 16:10:14 +0800
Subject: [PATCH] net/iavf: fix Tx context descriptor

[ upstream commit 2444d35dc14621c185a8c5042adfb636e5056d2b ]

The QW0 of Tx context descriptor should be reset to 0, otherwise the
previous hardware writeback value may pollute the next context descriptor
write.

Fixes: a2b29a7733ef ("net/avf: enable basic Rx Tx")

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
Signed-off-by: Beilei Xing <beilei.xing at intel.com>
Acked-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index ae43eb49a6..93f3928af6 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -1583,6 +1583,11 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 				(volatile struct iavf_tx_context_desc *)
 							&txr[tx_id];
 
+			/* clear QW0 or the previous writeback value
+			 * may impact next write
+			 */
+			*(volatile uint64_t *)ctx_txd = 0;
+
 			txn = &sw_ring[txe->next_id];
 			RTE_MBUF_PREFETCH_TO_FREE(txn->mbuf);
 			if (txe->mbuf) {
-- 
2.31.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-06-10 14:04:59.060073222 +0200
+++ 0021-net-iavf-fix-Tx-context-descriptor.patch	2021-06-10 14:04:58.042024466 +0200
@@ -1 +1 @@
-From 2444d35dc14621c185a8c5042adfb636e5056d2b Mon Sep 17 00:00:00 2001
+From 3cda8f66ab6771d80766dc25f0464bca03962d79 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 2444d35dc14621c185a8c5042adfb636e5056d2b ]
+
@@ -11 +12,0 @@
-Cc: stable at dpdk.org
@@ -21 +22 @@
-index 74b5ab5bde..6a713df828 100644
+index ae43eb49a6..93f3928af6 100644
@@ -24 +25 @@
-@@ -2245,6 +2245,11 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+@@ -1583,6 +1583,11 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)