patch 'vdpa/ifc: fix reconnection in SW-assisted live migration' has been queued to stable release 21.11.4

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 21.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/28/23. 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/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/e928dfe88cd92ec50392d6023f07d96b89c42d54

Thanks.

Kevin

---
>From e928dfe88cd92ec50392d6023f07d96b89c42d54 Mon Sep 17 00:00:00 2001
From: Andy Pei <andy.pei at intel.com>
Date: Mon, 12 Dec 2022 15:12:45 +0800
Subject: [PATCH] vdpa/ifc: fix reconnection in SW-assisted live migration

[ upstream commit ef3be7e237dd707f46870b09b93f88f8ee5e75c6 ]

In the case using argument "sw-live-migration=1" to enable SW assisted live
migration, we take QEMU as front end for example, after source VM migrates
to destination VM, we keep vdpa process for source VM there, we kill the
QEMU process for source VM, and restart the QEMU process for source VM.
In this case, vdpa driver will not perform DMA map and data path will not
work properly.

The above case works fine in the case "sw-live-migration=0".

The root cause is that current code driver does not set running flag to 0.
Driver treats device as ruuning and does not perform DMA map.

Fixes: 4bb531e152d3 ("net/ifc: support SW assisted VDPA live migration")

Signed-off-by: Andy Pei <andy.pei at intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/vdpa/ifc/ifcvf_vdpa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c
index d3c05bd3f9..c9b10527cc 100644
--- a/drivers/vdpa/ifc/ifcvf_vdpa.c
+++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
@@ -849,4 +849,6 @@ ifcvf_sw_fallback_switchover(struct ifcvf_internal *internal)
 	vdpa_disable_vfio_intr(internal);
 
+	rte_atomic32_set(&internal->running, 0);
+
 	ret = rte_vhost_host_notifier_ctrl(vid, RTE_VHOST_QUEUE_ALL, false);
 	if (ret && ret != -ENOTSUP)
-- 
2.39.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2023-02-23 14:46:24.422938327 +0000
+++ 0024-vdpa-ifc-fix-reconnection-in-SW-assisted-live-migrat.patch	2023-02-23 14:46:23.731235830 +0000
@@ -1 +1 @@
-From ef3be7e237dd707f46870b09b93f88f8ee5e75c6 Mon Sep 17 00:00:00 2001
+From e928dfe88cd92ec50392d6023f07d96b89c42d54 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit ef3be7e237dd707f46870b09b93f88f8ee5e75c6 ]
+
@@ -19 +20,0 @@
-Cc: stable at dpdk.org
@@ -28 +29 @@
-index 9468f66638..35520ea3ae 100644
+index d3c05bd3f9..c9b10527cc 100644
@@ -31 +32 @@
-@@ -1045,4 +1045,6 @@ ifcvf_sw_fallback_switchover(struct ifcvf_internal *internal)
+@@ -849,4 +849,6 @@ ifcvf_sw_fallback_switchover(struct ifcvf_internal *internal)