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GET /api/patches/811445/?format=api
HTTP 200 OK
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Content-Type: application/json
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{
    "id": 811445,
    "url": "http://patchwork.ozlabs.org/api/patches/811445/?format=api",
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    "date": "2017-09-08T10:00:50",
    "name": "[ovs-dev,v3] netdev-dpdk: reset packet_type for reused dp_packets",
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        "name": "Zoltan Balogh",
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            "web_url": "http://patchwork.ozlabs.org/project/openvswitch/list/?series=2165",
            "date": "2017-09-08T10:00:50",
            "name": "[ovs-dev,v3] netdev-dpdk: reset packet_type for reused dp_packets",
            "version": 3,
            "mbox": "http://patchwork.ozlabs.org/series/2165/mbox/"
        }
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        "Thread-Topic": "[PATCH v3] netdev-dpdk: reset packet_type for reused dp_packets",
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        "Subject": "[ovs-dev] [PATCH v3] netdev-dpdk: reset packet_type for reused\n\tdp_packets",
        "X-BeenThere": "ovs-dev@openvswitch.org",
        "X-Mailman-Version": "2.1.12",
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    "content": "DPDK uses dp-packet pool for storing received packets. The pool is\nreused by rxq_recv funcions of the DPDK netdevs. The datapath is\ncapable to modify the packet_type property of packets. For instance\nwhen encapsulated L3 packets are received on a ptap gre port.\nIn this case the packet_type property of struct dp_packet can be\nmodified and later the same dp_packet with the modified packet_type\ncan be reused in the rxq_rec function, so it can contain corrupted\ndata.\n\nThe dp_packet_batch_init_cutlen() in the rxq_recv functions iterates\nover dp_packets and sets their cutlen. So I modified this function\nto set packet_type to Ethernet for the dp_packets as well. I also\nrenamed this function because of the added functionality.\n\nThe dp_packet_batch_init_cutlen() iterates over batch->count dp_packet.\nTherefore setting of batch->count = nb_rx needs to be done before the\nformer function is invoked. This is an additional fix.\n\nSigned-off-by: Zoltan Balogh <zoltan.balogh@ericsson.com>\nSigned-off-by: Laszlo Suru <laszlo.suru@ericsson.com>\nCo-authored-by: Laszlo Suru <laszlo.suru@ericsson.com>\nCC: Jan Scheurich <jan.scheurich@ericsson.com>\nCC: Sugesh Chandran <sugesh.chandran@intel.com>\nCC: Darrell Ball <dlu998@gmail.com>\n---\nlib/dp-packet.h   | 3 ++-\nlib/netdev-dpdk.c | 7 ++++---\n2 files changed, 6 insertions(+), 4 deletions(-)\n\n     }\n-    dp_packet_batch_init_cutlen(batch);\n     batch->count = nb_rx;\n+    dp_packet_batch_init_packet_fields(batch);\n     return 0;\n}\n--\n1.9.1",
    "diff": "diff --git a/lib/dp-packet.h b/lib/dp-packet.h\nindex 046f3ab..b4b721c 100644\n--- a/lib/dp-packet.h\n+++ b/lib/dp-packet.h\n@@ -805,12 +805,13 @@ dp_packet_delete_batch(struct dp_packet_batch *batch, bool may_steal)\n}\n static inline void\n-dp_packet_batch_init_cutlen(struct dp_packet_batch *batch)\n+dp_packet_batch_init_packet_fields(struct dp_packet_batch *batch)\n{\n     struct dp_packet *packet;\n     DP_PACKET_BATCH_FOR_EACH (packet, batch) {\n         dp_packet_reset_cutlen(packet);\n+        packet->packet_type = htonl(PT_ETH);\n     }\n}\ndiff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c\nindex f58e9be..ccccb9a 100644\n--- a/lib/netdev-dpdk.c\n+++ b/lib/netdev-dpdk.c\n@@ -1644,8 +1644,9 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,\n                                          nb_rx, dropped);\n     rte_spinlock_unlock(&dev->stats_lock);\n-    dp_packet_batch_init_cutlen(batch);\n-    batch->count = (int) nb_rx;\n+    batch->count = nb_rx;\n+    dp_packet_batch_init_packet_fields(batch);\n+\n     return 0;\n}\n@@ -1684,8 +1685,8 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct dp_packet_batch *batch)\n         rte_spinlock_unlock(&dev->stats_lock);\n",
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}