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From: wangyunjian <wangyunjian@huawei.com>
To: <dev@dpdk.org>
Cc: <david.marchand@redhat.com>, <thomas@monjalon.net>,
	<anatoly.burakov@intel.com>, <ktraynor@redhat.com>,
	<dingxiaoxiong@huawei.com>, Yunjian Wang <wangyunjian@huawei.com>,
	<stable@dpdk.org>
Subject: [dpdk-stable] [dpdk-dev] [PATCH v5] eal: fix create user mem map repeatedly when it exists
Date: Sat, 10 Apr 2021 17:37:57 +0800
Message-ID: <1618047477-22368-1-git-send-email-wangyunjian@huawei.com> (raw)
In-Reply-To: <1602840525-8848-1-git-send-email-wangyunjian@huawei.com>

From: Yunjian Wang <wangyunjian@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@dpdk.org

Suggested-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Anatoly Burakov <anatoly.burakov@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


  parent reply	other threads:[~2021-04-10  9:38 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 13:38 [dpdk-stable] [PATCH 1/1] eal/linux: do not " wangyunjian
2020-07-17 14:19 ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
2020-07-17 14:23   ` Burakov, Anatoly
2020-07-20  2:00     ` wangyunjian
2020-07-20 11:46       ` Burakov, Anatoly
2020-07-22 12:47         ` wangyunjian
2020-07-23 14:48 ` [dpdk-stable] [dpdk-dev] [PATCH v2] " wangyunjian
2020-07-24 13:25   ` Burakov, Anatoly
2020-07-25  9:59     ` wangyunjian
2020-07-27  9:24       ` Burakov, Anatoly
2020-07-30 13:16         ` wangyunjian
2020-07-31 11:55           ` Burakov, Anatoly
2020-08-05 12:58             ` wangyunjian
2020-09-17 11:33               ` Burakov, Anatoly
2020-09-17 11:35   ` Burakov, Anatoly
2020-10-15 12:46     ` wangyunjian
2020-10-15 12:54       ` David Marchand
2020-10-16  9:48         ` wangyunjian
2020-10-16  9:28   ` [dpdk-stable] [dpdk-dev] [PATCH v3] eal: fix " wangyunjian
2020-10-20 14:09     ` Thomas Monjalon
2020-11-15 14:23       ` Thomas Monjalon
2020-11-22 18:20         ` Thomas Monjalon
2020-11-23  7:40           ` wangyunjian
2020-11-27 12:54       ` Burakov, Anatoly
2020-12-07 11:08     ` [dpdk-stable] [dpdk-dev] [PATCH v4] " wangyunjian
2021-03-25 13:38       ` wangyunjian
2021-03-25 14:30       ` Thomas Monjalon
2021-03-25 16:45         ` Kevin Traynor
2021-04-10  9:37     ` wangyunjian [this message]
2021-04-19 11:47       ` [dpdk-stable] [dpdk-dev] [PATCH v5] " Thomas Monjalon

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