patch 'vdpa/ifc: handle data path update failure' has been queued to stable release 20.11.7

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/22. 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/67792ab2fd401cb62c5b0d64dbf1b3e01e1a854c

Thanks.

Luca Boccassi

---
>From 67792ab2fd401cb62c5b0d64dbf1b3e01e1a854c Mon Sep 17 00:00:00 2001
From: Taekyung Kim <kim.tae.kyung at navercorp.com>
Date: Thu, 10 Nov 2022 13:09:43 +0900
Subject: [PATCH] vdpa/ifc: handle data path update failure

[ upstream commit 903ec2b1b49e496815c016b0104fd655cd972661 ]

Stop and return the error code when update_datapath fails.
update_datapath prepares resources for the vdpa device.
The driver should not perform any further actions
if update_datapath returns an error.

Fixes: a3f8150eac6d ("net/ifcvf: add ifcvf vDPA driver")

Signed-off-by: Taekyung Kim <kim.tae.kyung at navercorp.com>
Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Acked-by: Andy Pei <andy.pei at intel.com>
---
 drivers/vdpa/ifc/ifcvf_vdpa.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c
index 85bca09377..4dbfd1a71d 100644
--- a/drivers/vdpa/ifc/ifcvf_vdpa.c
+++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
@@ -894,7 +894,12 @@ ifcvf_dev_config(int vid)
 	internal = list->internal;
 	internal->vid = vid;
 	rte_atomic32_set(&internal->dev_attached, 1);
-	update_datapath(internal);
+	if (update_datapath(internal) < 0) {
+		DRV_LOG(ERR, "failed to update datapath for vDPA device %s",
+			vdev->device->name);
+		rte_atomic32_set(&internal->dev_attached, 0);
+		return -1;
+	}
 
 	if (rte_vhost_host_notifier_ctrl(vid, RTE_VHOST_QUEUE_ALL, true) != 0)
 		DRV_LOG(NOTICE, "vDPA (%s): software relay is used.",
@@ -936,7 +941,12 @@ ifcvf_dev_close(int vid)
 		internal->sw_fallback_running = false;
 	} else {
 		rte_atomic32_set(&internal->dev_attached, 0);
-		update_datapath(internal);
+		if (update_datapath(internal) < 0) {
+			DRV_LOG(ERR, "failed to update datapath for vDPA device %s",
+				vdev->device->name);
+			internal->configured = 0;
+			return -1;
+		}
 	}
 
 	internal->configured = 0;
@@ -1255,7 +1265,15 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	pthread_mutex_unlock(&internal_list_lock);
 
 	rte_atomic32_set(&internal->started, 1);
-	update_datapath(internal);
+	if (update_datapath(internal) < 0) {
+		DRV_LOG(ERR, "failed to update datapath %s", pci_dev->name);
+		rte_atomic32_set(&internal->started, 0);
+		rte_vdpa_unregister_device(internal->vdev);
+		pthread_mutex_lock(&internal_list_lock);
+		TAILQ_REMOVE(&internal_list, list, next);
+		pthread_mutex_unlock(&internal_list_lock);
+		goto error;
+	}
 
 	rte_kvargs_free(kvlist);
 	return 0;
@@ -1284,7 +1302,8 @@ ifcvf_pci_remove(struct rte_pci_device *pci_dev)
 
 	internal = list->internal;
 	rte_atomic32_set(&internal->started, 0);
-	update_datapath(internal);
+	if (update_datapath(internal) < 0)
+		DRV_LOG(ERR, "failed to update datapath %s", pci_dev->name);
 
 	rte_pci_unmap_device(internal->pdev);
 	rte_vfio_container_destroy(internal->vfio_container_fd);
-- 
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-11-22 22:01:31.598338961 +0000
+++ 0001-vdpa-ifc-handle-data-path-update-failure.patch	2022-11-22 22:01:31.443523419 +0000
@@ -1 +1 @@
-From 903ec2b1b49e496815c016b0104fd655cd972661 Mon Sep 17 00:00:00 2001
+From 67792ab2fd401cb62c5b0d64dbf1b3e01e1a854c Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 903ec2b1b49e496815c016b0104fd655cd972661 ]
+
@@ -12 +13,0 @@
-Cc: stable at dpdk.org
@@ -23 +24 @@
-index 8dfd49336e..49d68ad1b1 100644
+index 85bca09377..4dbfd1a71d 100644
@@ -26 +27 @@
-@@ -1098,7 +1098,12 @@ ifcvf_dev_config(int vid)
+@@ -894,7 +894,12 @@ ifcvf_dev_config(int vid)
@@ -38,3 +39,3 @@
- 	hw = &internal->hw;
- 	for (i = 0; i < hw->nr_vring; i++) {
-@@ -1146,7 +1151,12 @@ ifcvf_dev_close(int vid)
+ 	if (rte_vhost_host_notifier_ctrl(vid, RTE_VHOST_QUEUE_ALL, true) != 0)
+ 		DRV_LOG(NOTICE, "vDPA (%s): software relay is used.",
+@@ -936,7 +941,12 @@ ifcvf_dev_close(int vid)
@@ -54,2 +55,2 @@
-@@ -1752,7 +1762,15 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
- 	}
+@@ -1255,7 +1265,15 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
+ 	pthread_mutex_unlock(&internal_list_lock);
@@ -71 +72 @@
-@@ -1781,7 +1799,8 @@ ifcvf_pci_remove(struct rte_pci_device *pci_dev)
+@@ -1284,7 +1302,8 @@ ifcvf_pci_remove(struct rte_pci_device *pci_dev)