From: yang_y_yi@163.com
To: dev@dpdk.org
Cc: jiayu.hu@intel.com, thomas@monjalon.net, yangyi01@inspur.com,
yang_y_yi@163.com
Subject: [dpdk-dev] [PATCH v2] gso: fix pyld_unit_size issue for udp gso
Date: Thu, 17 Sep 2020 10:12:49 +0800 [thread overview]
Message-ID: <20200917021249.191088-1-yang_y_yi@163.com> (raw)
From: Yi Yang <yangyi01@inspur.com>
Fragment offset of IPv4 header is measured in units of
8 bytes. Fragment offset of UDP fragments will be wrong
after GSO if pyld_unit_size isn't multiple of 8. Say
pyld_unit_size is 1500, fragment offset of the second
UDP fragment will be 187 (i.e. 1500 / 8), which means 1496,
and it will result in 4-byte data loss (1500 - 1496 = 4).
So UDP GRO will reassemble out a wrong packet.
Fixes: b166d4f30b66 ("gso: support UDP/IPv4 fragmentation")
Signed-off-by: Yi Yang <yangyi01@inspur.com>
---
lib/librte_gso/gso_udp4.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/librte_gso/gso_udp4.c b/lib/librte_gso/gso_udp4.c
index 21fea09..6fa68f2 100644
--- a/lib/librte_gso/gso_udp4.c
+++ b/lib/librte_gso/gso_udp4.c
@@ -69,7 +69,10 @@
return 1;
}
- pyld_unit_size = gso_size - hdr_offset;
+ /* pyld_unit_size must be a multiple of 8 because frag_off
+ * uses 8 bytes as unit.
+ */
+ pyld_unit_size = (gso_size - hdr_offset) & ~7U;
/* Segment the payload */
ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
--
1.8.3.1
next reply other threads:[~2020-09-17 2:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 2:12 yang_y_yi [this message]
2020-09-17 2:16 ` Hu, Jiayu
2020-09-17 15:01 ` Ferruh Yigit
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