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From: Yicai Lu <luyicai@huawei.com>
To: <dev@dpdk.org>
Cc: <konstantin.ananyev@intel.com>, <zhoujingbin@huawei.com>,
	<chenchanghu@huawei.com>, <jerry.lilijun@huawei.com>,
	<haifeng.lin@huawei.com>, <guohongzhi1@huawei.com>,
	<wangyunjian@huawei.com>,  Yicai Lu <luyicai@huawei.com>,
	<anatoly.burakov@intel.com>
Subject: [dpdk-dev] [PATCH v2] ip_frag: recalculate data length of fragment
Date: Mon, 23 Nov 2020 10:27:15 +0800
Message-ID: <1606098435-15804-1-git-send-email-luyicai@huawei.com> (raw)
In-Reply-To: <1605706193-17192-1-git-send-email-luyicai@huawei.com>

In some situations, we would get several ip fragments, which total
data length is less than minimum frame(64) and padding with zeros.
Examples: Second Fragment "a0a1 a2a3 a4a5 a6a7 0000 0000 ..."
and Third Fragment "a8a9 aaab acad aeaf b0b1 b2b3 ...".
Finally, we would reassemble Second and Third Fragment like this
"a0a1 a2a3 a4a5 a6a7 0000 0000 ... a8a9 aaab acad aeaf b0b1 ...",
which is not correct!
So, we need recalculate data length of fragment to remove padings!

Fixes: 416707812c03 ("ip_frag: refactor reassembly code into a proper library")
Cc: anatoly.burakov@intel.com

Signed-off-by: Yicai Lu <luyicai@huawei.com>
---
v1 -> v2: Adjust commit info style
---
 lib/librte_ip_frag/ip_frag_internal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/librte_ip_frag/ip_frag_internal.c b/lib/librte_ip_frag/ip_frag_internal.c
index b436a4c..7bdd980 100644
--- a/lib/librte_ip_frag/ip_frag_internal.c
+++ b/lib/librte_ip_frag/ip_frag_internal.c
@@ -155,6 +155,7 @@ struct rte_mbuf *
 
 	fp->frags[idx].ofs = ofs;
 	fp->frags[idx].len = len;
+	mb->data_len = mb->l2_len + mb->l3_len + len;
 	fp->frags[idx].mb = mb;
 
 	mb = NULL;
-- 
1.9.5.msysgit.1


  parent reply	other threads:[~2020-11-23  2:27 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18 13:29 [dpdk-dev] [PATCH] " Yicai Lu
2020-11-22 11:22 ` Thomas Monjalon
2020-11-23  2:27 ` Yicai Lu [this message]
2020-12-12 11:05 ` [dpdk-dev] [PATCH v5] ip_frag: remove padding " Yicai Lu
2020-12-14 14:44   ` Ananyev, Konstantin
2020-12-15  3:18     ` luyicai
2020-12-16 10:44       ` Ananyev, Konstantin
2020-12-16 10:54         ` luyicai
2020-12-16 13:36 ` [dpdk-dev] [PATCH v6] " Yicai Lu
2020-12-18 11:41   ` Ananyev, Konstantin
2021-01-15 10:29     ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon

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