[dpdk-stable] patch 'vhost: remove pending IOTLB entry if miss request failed' has been queued to LTS release 17.11.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to LTS release 17.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/09/18. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 55811badd15743cb2f12fe248bec64ae4b401753 Mon Sep 17 00:00:00 2001
From: Maxime Coquelin <maxime.coquelin at redhat.com>
Date: Mon, 5 Feb 2018 16:04:57 +0100
Subject: [PATCH] vhost: remove pending IOTLB entry if miss request failed

[ upstream commit 82b9c1540348b6be7996203065e10421e953cea9 ]

In case vhost_user_iotlb_miss returns an error, the pending IOTLB
entry has to be removed from the list as no IOTLB update will be
received.

Fixes: fed67a20ac94 ("vhost: introduce guest IOVA to backend VA helper")

Suggested-by: Tiwei Bie <tiwei.bie at intel.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/iotlb.c |  2 +-
 lib/librte_vhost/iotlb.h |  3 +++
 lib/librte_vhost/vhost.c | 13 ++++++++++---
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/lib/librte_vhost/iotlb.c b/lib/librte_vhost/iotlb.c
index 72cd27d..c11ebca 100644
--- a/lib/librte_vhost/iotlb.c
+++ b/lib/librte_vhost/iotlb.c
@@ -120,7 +120,7 @@ vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq,
 	rte_rwlock_write_unlock(&vq->iotlb_pending_lock);
 }
 
-static void
+void
 vhost_user_iotlb_pending_remove(struct vhost_virtqueue *vq,
 				uint64_t iova, uint64_t size, uint8_t perm)
 {
diff --git a/lib/librte_vhost/iotlb.h b/lib/librte_vhost/iotlb.h
index f1a050e..e7083e3 100644
--- a/lib/librte_vhost/iotlb.h
+++ b/lib/librte_vhost/iotlb.h
@@ -71,6 +71,9 @@ bool vhost_user_iotlb_pending_miss(struct vhost_virtqueue *vq, uint64_t iova,
 						uint8_t perm);
 void vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq, uint64_t iova,
 						uint8_t perm);
+void vhost_user_iotlb_pending_remove(struct vhost_virtqueue *vq, uint64_t iova,
+						uint64_t size, uint8_t perm);
+
 int vhost_user_iotlb_init(struct virtio_net *dev, int vq_index);
 
 #endif /* _VHOST_IOTLB_H_ */
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index dcc42fc..51ea720 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -71,7 +71,9 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	if (tmp_size == size)
 		return vva;
 
-	if (!vhost_user_iotlb_pending_miss(vq, iova + tmp_size, perm)) {
+	iova += tmp_size;
+
+	if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
 		/*
 		 * iotlb_lock is read-locked for a full burst,
 		 * but it only protects the iotlb cache.
@@ -81,8 +83,13 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 		 */
 		vhost_user_iotlb_rd_unlock(vq);
 
-		vhost_user_iotlb_pending_insert(vq, iova + tmp_size, perm);
-		vhost_user_iotlb_miss(dev, iova + tmp_size, perm);
+		vhost_user_iotlb_pending_insert(vq, iova, perm);
+		if (vhost_user_iotlb_miss(dev, iova, perm)) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+				"IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
+				iova);
+			vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
+		}
 
 		vhost_user_iotlb_rd_lock(vq);
 	}
-- 
2.7.4