[dpdk-stable] [PATCH v2] example/ipv4_multicast: fix app hanging when using clone

[Wang, Dong1]

Hi Herakliusz,

Since pkt->ol_flags might set some other bits except IND_ATTACHED_MBUF, how about set its value to original pkt->ol_flags?

Regards,
Dong

-----Original Message-----
From: Lipiec, Herakliusz 
Sent: Tuesday, November 13, 2018 19:49
To: dev at dpdk.org
Cc: Ananyev, Konstantin <konstantin.ananyev at intel.com>; Wang, Dong1 <dong1.wang at intel.com>; thomas at monjalon.net; Burakov, Anatoly <anatoly.burakov at intel.com>; Lipiec, Herakliusz <herakliusz.lipiec at intel.com>; stable at dpdk.org
Subject: [PATCH v2] example/ipv4_multicast: fix app hanging when using clone

The ipv4_multicast sample application was dropping packets when using mbuf clone. When creating an L2 header and copying metadata from the source packet, the ol_flags were also copied along with all the other metadata. Because the cloned packet had IND_ATTACHED_MBUF flag set in its ol_flags, this caused the packets to never be freed when using rte_pktmbuf_free.
Since copying ol_flags from the cloned packet is not necessary in the first place, just don't do it.

Fixes: af75078fece3 ("first public release")
CC: stable at dpdk.org

Reported-by: Wang Dong <dong1.wang at intel.com>
Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec at intel.com>
---
 doc/guides/sample_app_ug/ipv4_multicast.rst | 1 -
 examples/ipv4_multicast/main.c              | 2 --
 2 files changed, 3 deletions(-)

diff --git a/doc/guides/sample_app_ug/ipv4_multicast.rst b/doc/guides/sample_app_ug/ipv4_multicast.rst
index ce1474ec7..f6efa7f6f 100644
--- a/doc/guides/sample_app_ug/ipv4_multicast.rst
+++ b/doc/guides/sample_app_ug/ipv4_multicast.rst
@@ -319,7 +319,6 @@ It is the mcast_out_pkt() function that performs the packet duplication (either
         hdr->pkt.in_port = pkt->pkt.in_port;
         hdr->pkt.vlan_macip = pkt->pkt.vlan_macip;
         hdr->pkt.hash = pkt->pkt.hash;
-        hdr->ol_flags = pkt->ol_flags;
         rte_mbuf_sanity_check(hdr, RTE_MBUF_PKT, 1);
 
         return hdr;
diff --git a/examples/ipv4_multicast/main.c b/examples/ipv4_multicast/main.c index 4073a4907..428ca4694 100644
--- a/examples/ipv4_multicast/main.c
+++ b/examples/ipv4_multicast/main.c
@@ -266,8 +266,6 @@ mcast_out_pkt(struct rte_mbuf *pkt, int use_clone)
 	hdr->tx_offload = pkt->tx_offload;
 	hdr->hash = pkt->hash;
 
-	hdr->ol_flags = pkt->ol_flags;
-
 	__rte_mbuf_sanity_check(hdr, 1);
 	return hdr;
 }
--
2.17.1