[{"id":1764417,"web_url":"http://patchwork.ozlabs.org/comment/1764417/","msgid":"<9D5B4962-7D34-4820-A8D5-2D8F52315EA2@vmware.com>","list_archive_url":null,"date":"2017-09-06T22:44:47","subject":"Re: [ovs-dev] [PATCH] netdev-dpdk: reset packet_type for reused\n\tdp_packets","submitter":{"id":68212,"url":"http://patchwork.ozlabs.org/api/people/68212/","name":"Darrell Ball","email":"dball@vmware.com"},"content":"On 9/6/17, 5:12 AM, \"ovs-dev-bounces@openvswitch.org on behalf of Zoltán Balogh\" wrote:\r\n\r\n DPDK uses dp-packet pool for storing received packets. The pool is\r\n reused by rxq_recv funcions of the DPDK netdevs. The datapath is\r\n capable to modify the packet_type property of packets. For instance\r\n when encapsulated L3 packets are received on a ptap gre port.\r\n In this case the packet_type property of struct dp_packet can be\r\n modified and later the same dp_packet with the modified packet_type\r\n can be reused in the rxq_rec function, so it can contain corrupted\r\n data.\r\n \r\n The dp_packet_batch_init_cutlen() in the rxq_recv functions iterates\r\n over dp_packets and sets their cutlen. So I modified this function\r\n to set packet_type to Ethernet for the dp_packets as well. I also\r\n renamed this function because of the added functionality.\r\n \r\n The dp_packet_batch_init_cutlen() iterates over batch->count dp_packet.\r\n Therefore setting of batch->count = nb_rx needs to be done before the\r\n former function is invoked. This is an additional fix.\r\n \r\n Signed-off-by: Zoltán Balogh \r\n Signed-off-by: László Sürü \r\n Co-authored-by: László Sürü \r\n CC: Jan Scheurich \r\n CC: Sugesh Chandran \r\n CC: Darrell Ball \r\n ---\r\n lib/dp-packet.h | 4 +++-\r\n lib/netdev-dpdk.c | 5 +++--\r\n 2 files changed, 6 insertions(+), 3 deletions(-)\r\n \r\n diff --git a/lib/dp-packet.h b/lib/dp-packet.h\r\n index 046f3ab..0046d0a 100644\r\n --- a/lib/dp-packet.h\r\n +++ b/lib/dp-packet.h\r\n @@ -805,12 +805,14 @@ dp_packet_delete_batch(struct dp_packet_batch *batch, bool may_steal)\r\n }\r\n \r\n static inline void\r\n -dp_packet_batch_init_cutlen(struct dp_packet_batch *batch)\r\n +dp_packet_batch_init_transient_fields(struct dp_packet_batch *batch)\r\n\r\n[Darrell]\r\nCan we just call this function dp_packet_batch_init_packet_fields() now that it has wider scope than just cutlen,\r\nas the name makes it clear that we are initing the individual packet fields of a batch, rather than the batch context fields ?\r\n‘transient’ is maybe implied ?\r\n\r\n\r\n {\r\n struct dp_packet *packet;\r\n \r\n DP_PACKET_BATCH_FOR_EACH (packet, batch) {\r\n dp_packet_reset_cutlen(packet);\r\n + /* Set packet_type to Ethernet. */\r\n + packet->packet_type = PACKET_TYPE_BE(OFPHTN_ONF, 0x0000);\r\n\r\n\r\n[Darrell] The original dp_packet init code for PTAP has\r\n b->packet_type = htonl(PT_ETH);\r\nThis form seems preferred and intuitive (comment would even be unnecessary); can we use this form ?\r\n\r\nAlso, the original dp_packet init code for PTAP was in dp_packet_init__ and then moved to dp_packet_init_dpdk\r\nI think we can just remove it from there, as it is redundant with the new code.\r\n\r\n\r\n }\r\n }\r\n \r\n diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c\r\n index f58e9be..2422741 100644\r\n --- a/lib/netdev-dpdk.c\r\n +++ b/lib/netdev-dpdk.c\r\n @@ -1644,8 +1644,9 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,\r\n nb_rx, dropped);\r\n rte_spinlock_unlock(&dev->stats_lock);\r\n \r\n - dp_packet_batch_init_cutlen(batch);\r\n batch->count = (int) nb_rx;\r\n\r\n[Darrell] Although nothing to do with this patch, can we remove the cast ‘(int)’ above ?\r\n\r\n\r\n + dp_packet_batch_init_transient_fields(batch);\r\n\r\n[Darrell]\r\nGood catch; this should work better than initializing 0 of the entries (\r\n\r\n +\r\n return 0;\r\n }\r\n \r\n @@ -1684,8 +1685,8 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct dp_packet_batch *batch)\r\n rte_spinlock_unlock(&dev->stats_lock);\r\n }\r\n \r\n - dp_packet_batch_init_cutlen(batch);\r\n batch->count = nb_rx;\r\n + dp_packet_batch_init_transient_fields(batch);\r\n\r\n[Darrell]\r\nSame comment as above.\r\n \r\n return 0;\r\n }\r\n -- \r\n 1.9.1\r\n \r\n _______________________________________________\r\n dev mailing list\r\n dev@openvswitch.org\r\n https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.openvswitch.org_mailman_listinfo_ovs-2Ddev&d=DwIFAw&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=zcjvUT1lz85oUJWStkTlRzIdXuQnJ4HL-n6oiK99iuM&s=KmEO2izD43oNVigXXu6TlPCLNruTmVtKMGdxVb6ANYs&e=","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","dev@openvswitch.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","ovs-dev@mail.linuxfoundation.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=openvswitch.org\n\t(client-ip=140.211.169.12; 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","received-spf":"None (protection.outlook.com: vmware.com does not designate\n\tpermitted sender hosts)","authentication-results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=openvswitch.org\n\t(client-ip=140.211.169.12; helo=mail.linuxfoundation.org;\n\tenvelope-from=ovs-dev-bounces@openvswitch.org;\n\treceiver=)","ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=onevmw.onmicrosoft.com\n\theader.i=@onevmw.onmicrosoft.com header.b=\"MVP7aF2b\"; \n\tdkim-atps=neutral","spf=none (sender IP is )\n\tsmtp.mailfrom=dball@vmware.com; "],"spamdiagnosticoutput":"1:99","spamdiagnosticmetadata":"NSPM","Content-ID":"<6F6B9CCA0E15154AB1B5DCCADA3F804A@namprd05.prod.outlook.com>","MIME-Version":"1.0","X-OriginatorOrg":"vmware.com","X-MS-Exchange-CrossTenant-originalarrivaltime":"06 Sep 2017 22:44:47.3073\n\t(UTC)","X-MS-Exchange-CrossTenant-fromentityheader":"Hosted","X-MS-Exchange-CrossTenant-id":"b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"BY2PR05MB1894","X-Spam-Status":"No, score=0.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_NONE autolearn=disabled version=3.3.1","X-Spam-Checker-Version":"SpamAssassin 3.3.1 (2010-03-16) on\n\tsmtp1.linux-foundation.org","Subject":"Re: [ovs-dev] [PATCH] netdev-dpdk: reset packet_type for reused\n\tdp_packets","X-BeenThere":"ovs-dev@openvswitch.org","X-Mailman-Version":"2.1.12","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Sender":"ovs-dev-bounces@openvswitch.org","Errors-To":"ovs-dev-bounces@openvswitch.org"}},{"id":1765160,"web_url":"http://patchwork.ozlabs.org/comment/1765160/","msgid":"","list_archive_url":null,"date":"2017-09-08T08:45:23","subject":"Re: [ovs-dev] [PATCH] netdev-dpdk: reset packet_type for reused\n\tdp_packets","submitter":{"id":67904,"url":"http://patchwork.ozlabs.org/api/people/67904/","name":"Zoltan Balogh","email":"zoltan.balogh@ericsson.com"},"content":"Hi Darrell,\r\n\r\nThank you for your comments! I created a second version and sent it to the dev list:\r\nhttps://patchwork.ozlabs.org/patch/811387/\r\n\r\nBest regards,\r\nZoltan\r\n\r\n> -----Original Message-----\r\n> From: Darrell Ball [mailto:dball@vmware.com]\r\n> Sent: Thursday, September 07, 2017 12:45 AM\r\n> To: Zoltán Balogh ; 'dev@openvswitch.org' \r\n> Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: reset packet_type for reused dp_packets\r\n> \r\n> \r\n> \r\n> On 9/6/17, 5:12 AM, \"ovs-dev-bounces@openvswitch.org on behalf of Zoltán Balogh\" behalf of zoltan.balogh@ericsson.com> wrote:\r\n> \r\n> DPDK uses dp-packet pool for storing received packets. The pool is\r\n> reused by rxq_recv funcions of the DPDK netdevs. The datapath is\r\n> capable to modify the packet_type property of packets. For instance\r\n> when encapsulated L3 packets are received on a ptap gre port.\r\n> In this case the packet_type property of struct dp_packet can be\r\n> modified and later the same dp_packet with the modified packet_type\r\n> can be reused in the rxq_rec function, so it can contain corrupted\r\n> data.\r\n> \r\n> The dp_packet_batch_init_cutlen() in the rxq_recv functions iterates\r\n> over dp_packets and sets their cutlen. So I modified this function\r\n> to set packet_type to Ethernet for the dp_packets as well. I also\r\n> renamed this function because of the added functionality.\r\n> \r\n> The dp_packet_batch_init_cutlen() iterates over batch->count dp_packet.\r\n> Therefore setting of batch->count = nb_rx needs to be done before the\r\n> former function is invoked. This is an additional fix.\r\n> \r\n> Signed-off-by: Zoltán Balogh \r\n> Signed-off-by: László Sürü \r\n> Co-authored-by: László Sürü \r\n> CC: Jan Scheurich \r\n> CC: Sugesh Chandran \r\n> CC: Darrell Ball \r\n> ---\r\n> lib/dp-packet.h | 4 +++-\r\n> lib/netdev-dpdk.c | 5 +++--\r\n> 2 files changed, 6 insertions(+), 3 deletions(-)\r\n> \r\n> diff --git a/lib/dp-packet.h b/lib/dp-packet.h\r\n> index 046f3ab..0046d0a 100644\r\n> --- a/lib/dp-packet.h\r\n> +++ b/lib/dp-packet.h\r\n> @@ -805,12 +805,14 @@ dp_packet_delete_batch(struct dp_packet_batch *batch, bool may_steal)\r\n> }\r\n> \r\n> static inline void\r\n> -dp_packet_batch_init_cutlen(struct dp_packet_batch *batch)\r\n> +dp_packet_batch_init_transient_fields(struct dp_packet_batch *batch)\r\n> \r\n> [Darrell]\r\n> Can we just call this function dp_packet_batch_init_packet_fields() now that it has wider scope than just cutlen,\r\n> as the name makes it clear that we are initing the individual packet fields of a batch, rather than the batch\r\n> context fields ?\r\n> ‘transient’ is maybe implied ?\r\n> \r\n> \r\n> {\r\n> struct dp_packet *packet;\r\n> \r\n> DP_PACKET_BATCH_FOR_EACH (packet, batch) {\r\n> dp_packet_reset_cutlen(packet);\r\n> + /* Set packet_type to Ethernet. */\r\n> + packet->packet_type = PACKET_TYPE_BE(OFPHTN_ONF, 0x0000);\r\n> \r\n> \r\n> [Darrell] The original dp_packet init code for PTAP has\r\n> b->packet_type = htonl(PT_ETH);\r\n> This form seems preferred and intuitive (comment would even be unnecessary); can we use this form ?\r\n> \r\n> Also, the original dp_packet init code for PTAP was in dp_packet_init__ and then moved to dp_packet_init_dpdk\r\n> I think we can just remove it from there, as it is redundant with the new code.\r\n> \r\n> \r\n> }\r\n> }\r\n> \r\n> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c\r\n> index f58e9be..2422741 100644\r\n> --- a/lib/netdev-dpdk.c\r\n> +++ b/lib/netdev-dpdk.c\r\n> @@ -1644,8 +1644,9 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,\r\n> nb_rx, dropped);\r\n> rte_spinlock_unlock(&dev->stats_lock);\r\n> \r\n> - dp_packet_batch_init_cutlen(batch);\r\n> batch->count = (int) nb_rx;\r\n> \r\n> [Darrell] Although nothing to do with this patch, can we remove the cast ‘(int)’ above ?\r\n> \r\n> \r\n> + dp_packet_batch_init_transient_fields(batch);\r\n> \r\n> [Darrell]\r\n> Good catch; this should work better than initializing 0 of the entries (\r\n> \r\n> +\r\n> return 0;\r\n> }\r\n> \r\n> @@ -1684,8 +1685,8 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct dp_packet_batch *batch)\r\n> rte_spinlock_unlock(&dev->stats_lock);\r\n> }\r\n> \r\n> - dp_packet_batch_init_cutlen(batch);\r\n> batch->count = nb_rx;\r\n> + dp_packet_batch_init_transient_fields(batch);\r\n> \r\n> [Darrell]\r\n> Same comment as above.\r\n> \r\n> return 0;\r\n> }\r\n> --\r\n> 1.9.1\r\n> \r\n> _______________________________________________\r\n> dev mailing list\r\n> dev@openvswitch.org\r\n> https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.openvswitch.org_mailman_listinfo_ovs-\r\n> 2Ddev&d=DwIFAw&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=zcjvUT1lz85oUJWStkTlRzIdXuQnJ4HL-\r\n> n6oiK99iuM&s=KmEO2izD43oNVigXXu6TlPCLNruTmVtKMGdxVb6ANYs&e=\r\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","dev@openvswitch.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","ovs-dev@mail.linuxfoundation.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=openvswitch.org\n\t(client-ip=140.211.169.12; 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