[dpdk-stable] patch 'vhost: fix IOTLB pool out-of-memory handling' 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 2f6b2ae70c32cc9e9bcc377945cdedaa3d7e515d Mon Sep 17 00:00:00 2001
From: Maxime Coquelin <maxime.coquelin at redhat.com>
Date: Mon, 5 Feb 2018 16:04:56 +0100
Subject: [PATCH] vhost: fix IOTLB pool out-of-memory handling

[ upstream commit 37771844a05c7b0a7b039dcae1b4b0a69b4acced ]

In the unlikely case the IOTLB memory pool runs out of memory,
an issue may happen if all entries are used by the IOTLB cache,
and an IOTLB miss happen. If the iotlb pending list is empty,
then no memory is freed and allocation fails a second time.

This patch fixes this by doing an IOTLB cache random evict if
the IOTLB pending list is empty, ensuring the second allocation
try will succeed.

In the same spirit, the opposite is done when inserting an
IOTLB entry in the IOTLB cache fails due to out of memory. In
this case, the IOTLB pending is flushed if the IOTLB cache is
empty to ensure the new entry can be inserted.

Fixes: d012d1f293f4 ("vhost: add IOTLB helper functions")
Fixes: f72c2ad63aeb ("vhost: add pending IOTLB miss request list and helpers")

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/iotlb.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/lib/librte_vhost/iotlb.c b/lib/librte_vhost/iotlb.c
index b74cc6a..72cd27d 100644
--- a/lib/librte_vhost/iotlb.c
+++ b/lib/librte_vhost/iotlb.c
@@ -51,6 +51,9 @@ struct vhost_iotlb_entry {
 #define IOTLB_CACHE_SIZE 2048
 
 static void
+vhost_user_iotlb_cache_random_evict(struct vhost_virtqueue *vq);
+
+static void
 vhost_user_iotlb_pending_remove_all(struct vhost_virtqueue *vq)
 {
 	struct vhost_iotlb_entry *node, *temp_node;
@@ -95,9 +98,11 @@ vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq,
 
 	ret = rte_mempool_get(vq->iotlb_pool, (void **)&node);
 	if (ret) {
-		RTE_LOG(INFO, VHOST_CONFIG,
-				"IOTLB pool empty, clear pending misses\n");
-		vhost_user_iotlb_pending_remove_all(vq);
+		RTE_LOG(DEBUG, VHOST_CONFIG, "IOTLB pool empty, clear entries\n");
+		if (!TAILQ_EMPTY(&vq->iotlb_pending_list))
+			vhost_user_iotlb_pending_remove_all(vq);
+		else
+			vhost_user_iotlb_cache_random_evict(vq);
 		ret = rte_mempool_get(vq->iotlb_pool, (void **)&node);
 		if (ret) {
 			RTE_LOG(ERR, VHOST_CONFIG, "IOTLB pool still empty, failure\n");
@@ -186,8 +191,11 @@ vhost_user_iotlb_cache_insert(struct vhost_virtqueue *vq, uint64_t iova,
 
 	ret = rte_mempool_get(vq->iotlb_pool, (void **)&new_node);
 	if (ret) {
-		RTE_LOG(DEBUG, VHOST_CONFIG, "IOTLB pool empty, evict one entry\n");
-		vhost_user_iotlb_cache_random_evict(vq);
+		RTE_LOG(DEBUG, VHOST_CONFIG, "IOTLB pool empty, clear entries\n");
+		if (!TAILQ_EMPTY(&vq->iotlb_list))
+			vhost_user_iotlb_cache_random_evict(vq);
+		else
+			vhost_user_iotlb_pending_remove_all(vq);
 		ret = rte_mempool_get(vq->iotlb_pool, (void **)&new_node);
 		if (ret) {
 			RTE_LOG(ERR, VHOST_CONFIG, "IOTLB pool still empty, failure\n");
-- 
2.7.4