[dpdk-stable] [dpdk-dev] [PATCH v5] eal: fix create user mem map repeatedly when it exists

[wangyunjian]

From: Yunjian Wang <wangyunjian at huawei.com>

Currently, new user mem maps are checked if they are adjacent to
an existing mem map and if so, the mem map entries are merged.

It doesn't check for duplicate mem maps, so if the API is called
with the same mem map multiple times, they will occupy multiple
mem map entries. This will reduce the amount of entries available
for unique mem maps.

So check for duplicate mem maps and merge them into one mem map
entry if any found.

Fixes: 0cbce3a167f1 ("vfio: skip DMA map failure if already mapped")
Cc: stable at dpdk.org

Suggested-by: Kevin Traynor <ktraynor at redhat.com>
Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
v5:
   Update commit log suggested by Kevin Traynor
---
 lib/librte_eal/linux/eal_vfio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_eal/linux/eal_vfio.c b/lib/librte_eal/linux/eal_vfio.c
index fe25719991..25add2fa5d 100644
--- a/lib/librte_eal/linux/eal_vfio.c
+++ b/lib/librte_eal/linux/eal_vfio.c
@@ -171,6 +171,10 @@ adjust_map(struct user_mem_map *src, struct user_mem_map *end,
 static int
 merge_map(struct user_mem_map *left, struct user_mem_map *right)
 {
+	/* merge the same maps into one */
+	if (memcmp(left, right, sizeof(struct user_mem_map)) == 0)
+		goto out;
+
 	if (left->addr + left->len != right->addr)
 		return 0;
 	if (left->iova + left->len != right->iova)
@@ -178,6 +182,7 @@ merge_map(struct user_mem_map *left, struct user_mem_map *right)
 
 	left->len += right->len;
 
+out:
 	memset(right, 0, sizeof(*right));
 
 	return 1;
-- 
2.23.0