From: wangyunjian <wangyunjian@huawei.com>
To: <dev@dpdk.org>
Cc: <ferruh.yigit@intel.com>, <liucheng11@huawei.com>,
<dingxiaoxiong@huawei.com>, Yunjian Wang <wangyunjian@huawei.com>
Subject: [dpdk-dev] [PATCH] kni: fix wrong mbuf alloc count in kni_allocate_mbufs
Date: Mon, 31 May 2021 20:09:10 +0800 [thread overview]
Message-ID: <4ebfe0d38b335a437edc9c58368153d005f562ce.1622460655.git.wangyunjian@huawei.com> (raw)
From: Yunjian Wang <wangyunjian@huawei.com>
In kni_allocate_mbufs(), we alloc mbuf for alloc_q as this code.
allocq_free = (kni->alloc_q->read - kni->alloc_q->write - 1) \
& (MAX_MBUF_BURST_NUM - 1);
The value of allocq_free maybe zero (e.g 32 & (32 - 1) = 0), and
it will not fill the alloc_q. When the alloc_q's free count is
zero, it will drop the packet in kernel kni.
In this patch, we set the allocq_free as the min between
MAX_MBUF_BURST_NUM and the free count of the alloc_q.
Signed-off-by: Cheng Liu <liucheng11@huawei.com>
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
---
lib/kni/rte_kni.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/kni/rte_kni.c b/lib/kni/rte_kni.c
index 9dae6a8d7c..20d8f20cef 100644
--- a/lib/kni/rte_kni.c
+++ b/lib/kni/rte_kni.c
@@ -677,8 +677,9 @@ kni_allocate_mbufs(struct rte_kni *kni)
return;
}
- allocq_free = (kni->alloc_q->read - kni->alloc_q->write - 1)
- & (MAX_MBUF_BURST_NUM - 1);
+ allocq_free = kni_fifo_free_count(kni->alloc_q);
+ allocq_free = (allocq_free > MAX_MBUF_BURST_NUM) ?
+ MAX_MBUF_BURST_NUM : allocq_free;
for (i = 0; i < allocq_free; i++) {
pkts[i] = rte_pktmbuf_alloc(kni->pktmbuf_pool);
if (unlikely(pkts[i] == NULL)) {
--
2.23.0
next reply other threads:[~2021-05-31 12:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 12:09 wangyunjian [this message]
2021-06-18 13:37 ` Ferruh Yigit
2021-06-21 3:27 ` wangyunjian
2021-06-21 11:26 ` Ferruh Yigit
2021-06-22 7:32 ` wangyunjian
2021-06-22 7:43 ` Ferruh Yigit
2021-06-22 10:57 ` [dpdk-dev] [PATCH v2] " wangyunjian
2021-06-22 12:27 ` Ferruh Yigit
2021-06-22 12:32 ` wangyunjian
2021-06-22 12:44 ` [dpdk-dev] [PATCH v3] kni: fix mbuf allocation for alloc FIFO wangyunjian
2021-06-22 20:46 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2021-06-23 12:16 ` wangyunjian
2021-06-23 14:11 ` Ferruh Yigit
2021-06-23 14:41 ` Thomas Monjalon
2021-06-24 1:55 ` Ajit Khaparde
2021-06-24 7:43 ` Thomas Monjalon
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