{"id":809042,"url":"http://patchwork.ozlabs.org/api/1.2/patches/809042/?format=json","web_url":"http://patchwork.ozlabs.org/project/openvswitch/patch/20170902050234.17169-1-sysugaozhenyu@gmail.com/","project":{"id":47,"url":"http://patchwork.ozlabs.org/api/1.2/projects/47/?format=json","name":"Open vSwitch","link_name":"openvswitch","list_id":"ovs-dev.openvswitch.org","list_email":"ovs-dev@openvswitch.org","web_url":"http://openvswitch.org/","scm_url":"git@github.com:openvswitch/ovs.git","webscm_url":"https://github.com/openvswitch/ovs","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20170902050234.17169-1-sysugaozhenyu@gmail.com>","list_archive_url":null,"date":"2017-09-02T05:02:34","name":"[ovs-dev,v4] netdev-dpdk: Implement TCP/UDP TX cksum in ovs-dpdk side","commit_ref":null,"pull_url":null,"state":"changes-requested","archived":false,"hash":"a83a90af7582163424e0e49e182afbdfa7221e5b","submitter":{"id":70513,"url":"http://patchwork.ozlabs.org/api/1.2/people/70513/?format=json","name":"Gao Zhenyu","email":"sysugaozhenyu@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/openvswitch/patch/20170902050234.17169-1-sysugaozhenyu@gmail.com/mbox/","series":[{"id":1138,"url":"http://patchwork.ozlabs.org/api/1.2/series/1138/?format=json","web_url":"http://patchwork.ozlabs.org/project/openvswitch/list/?series=1138","date":"2017-09-02T05:02:34","name":"[ovs-dev,v4] netdev-dpdk: Implement TCP/UDP TX cksum in ovs-dpdk side","version":4,"mbox":"http://patchwork.ozlabs.org/series/1138/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/809042/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/809042/checks/","tags":{},"related":[],"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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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"ovs-dev-bounces@openvswitch.org","Errors-To":"ovs-dev-bounces@openvswitch.org"},"content":"Currently, the dpdk-vhost side in ovs doesn't support tcp/udp tx cksum.\nSo L4 packets's cksum were calculated in VM side but performance is not\ngood.\nImplementing tcp/udp tx cksum in ovs-dpdk side improves throughput in\nVM->phy->phy->VM situation. And it makes virtio-net frontend-driver\nsupport NETIF_F_SG(feature scatter-gather) as well.\n\nSigned-off-by: Zhenyu Gao \n---\n\nHere is some performance number:\n\nSetup:\n\n qperf client\n+---------+\n| VM |\n+---------+\n |\n | qperf server\n+--------------+ +------------+\n| vswitch+dpdk | | bare-metal |\n+--------------+ +------------+\n | |\n | |\n pNic---------PhysicalSwitch----\n\ndo cksum in ovs-dpdk: Applied this patch and execute 'ethtool -K eth0 tx on' in VM side.\n It offload cksum job to ovs-dpdk side.\n\ndo cksum in VM: Applied this patch and execute 'ethtool -K eth0 tx off' in VM side.\n VM calculate cksum for tcp/udp packets.\n\nWe can see huge improvment in TCP throughput if we leverage ovs-dpdk cksum.\n\n[root@localhost ~]# qperf -t 10 -oo msg_size:1:64K:*2 host-qperf-server01 tcp_bw tcp_lat udp_bw udp_lat\n do cksum in ovs-dpdk do cksum in VM without this patch\ntcp_bw: \n bw = 1.9 MB/sec bw = 1.92 MB/sec bw = 1.95 MB/sec\ntcp_bw: \n bw = 3.97 MB/sec bw = 3.99 MB/sec bw = 3.98 MB/sec\ntcp_bw: \n bw = 7.75 MB/sec bw = 7.79 MB/sec bw = 7.89 MB/sec\ntcp_bw: \n bw = 14.7 MB/sec bw = 14.7 MB/sec bw = 14.9 MB/sec\ntcp_bw: \n bw = 27.7 MB/sec bw = 27.4 MB/sec bw = 28 MB/sec\ntcp_bw: \n bw = 51.1 MB/sec bw = 51.3 MB/sec bw = 51.8 MB/sec\ntcp_bw: \n bw = 86.2 MB/sec bw = 84.4 MB/sec bw = 87.6 MB/sec\ntcp_bw: \n bw = 141 MB/sec bw = 142 MB/sec bw = 141 MB/sec\ntcp_bw: \n bw = 203 MB/sec bw = 201 MB/sec bw = 211 MB/sec\ntcp_bw: \n bw = 267 MB/sec bw = 250 MB/sec bw = 260 MB/sec\ntcp_bw: \n bw = 324 MB/sec bw = 295 MB/sec bw = 302 MB/sec\ntcp_bw: \n bw = 397 MB/sec bw = 363 MB/sec bw = 347 MB/sec\ntcp_bw: \n bw = 765 MB/sec bw = 510 MB/sec bw = 383 MB/sec\ntcp_bw: \n bw = 850 MB/sec bw = 710 MB/sec bw = 417 MB/sec\ntcp_bw: \n bw = 1.09 GB/sec bw = 860 MB/sec bw = 444 MB/sec\ntcp_bw: \n bw = 1.17 GB/sec bw = 979 MB/sec bw = 447 MB/sec\ntcp_bw: \n bw = 1.17 GB/sec bw = 1.07 GB/sec bw = 462 MB/sec\ntcp_lat: \n latency = 29.1 us latency = 28.7 us latency = 29.1 us\ntcp_lat: \n latency = 29 us latency = 28.8 us latency = 29 us\ntcp_lat: \n latency = 29 us latency = 28.8 us latency = 29 us\ntcp_lat: \n latency = 29 us latency = 28.9 us latency = 29 us\ntcp_lat: \n latency = 29.2 us latency = 28.9 us latency = 29.1 us\ntcp_lat: \n latency = 29.1 us latency = 29.1 us latency = 29.1 us\ntcp_lat: \n latency = 29.5 us latency = 29.5 us latency = 29.5 us\ntcp_lat: \n latency = 29.8 us latency = 29.8 us latency = 29.9 us\ntcp_lat: \n latency = 30.7 us latency = 30.7 us latency = 30.7 us\ntcp_lat: \n latency = 47.1 us latency = 46.2 us latency = 47.1 us\ntcp_lat: \n latency = 52.1 us latency = 52.3 us latency = 53.3 us\ntcp_lat: \n latency = 44 us latency = 43.8 us latency = 43.2 us\ntcp_lat: \n latency = 50 us latency = 46.6 us latency = 47.8 us\ntcp_lat: \n latency = 79.2 us latency = 77.9 us latency = 78.9 us\ntcp_lat: \n latency = 82.3 us latency = 81.7 us latency = 82.2 us\ntcp_lat: \n latency = 96.7 us latency = 90.8 us latency = 127 us\ntcp_lat: \n latency = 215 us latency = 177 us latency = 225 us\nudp_bw: \n send_bw = 422 KB/sec send_bw = 415 KB/sec send_bw = 405 KB/sec\n recv_bw = 402 KB/sec recv_bw = 404 KB/sec recv_bw = 403 KB/sec\nudp_bw: \n send_bw = 845 KB/sec send_bw = 835 KB/sec send_bw = 802 KB/sec\n recv_bw = 831 KB/sec recv_bw = 804 KB/sec recv_bw = 802 KB/sec\nudp_bw: \n send_bw = 1.69 MB/sec send_bw = 1.66 MB/sec send_bw = 1.62 MB/sec\n recv_bw = 1.45 MB/sec recv_bw = 1.63 MB/sec recv_bw = 1.6 MB/sec\nudp_bw: \n send_bw = 3.38 MB/sec send_bw = 3.33 MB/sec send_bw = 3.24 MB/sec\n recv_bw = 3.32 MB/sec recv_bw = 3.25 MB/sec recv_bw = 3.24 MB/sec\nudp_bw: \n send_bw = 6.76 MB/sec send_bw = 6.63 MB/sec send_bw = 6.47 MB/sec\n recv_bw = 6.42 MB/sec recv_bw = 5.59 MB/sec recv_bw = 6.45 MB/sec\nudp_bw: \n send_bw = 13.5 MB/sec send_bw = 13.3 MB/sec send_bw = 13 MB/sec\n recv_bw = 13.4 MB/sec recv_bw = 12.1 MB/sec recv_bw = 13 MB/sec\nudp_bw: \n send_bw = 27 MB/sec send_bw = 26.5 MB/sec send_bw = 25.9 MB/sec\n recv_bw = 26.4 MB/sec recv_bw = 21.5 MB/sec recv_bw = 25.9 MB/sec\nudp_bw: \n send_bw = 53.8 MB/sec send_bw = 52.9 MB/sec send_bw = 51.7 MB/sec\n recv_bw = 49.1 MB/sec recv_bw = 47.6 MB/sec recv_bw = 51.1 MB/sec\nudp_bw: \n send_bw = 108 MB/sec send_bw = 105 MB/sec send_bw = 102 MB/sec\n recv_bw = 91.1 MB/sec recv_bw = 101 MB/sec recv_bw = 100 MB/sec\nudp_bw: \n send_bw = 212 MB/sec send_bw = 208 MB/sec send_bw = 203 MB/sec\n recv_bw = 204 MB/sec recv_bw = 204 MB/sec recv_bw = 169 MB/sec\nudp_bw: \n send_bw = 414 MB/sec send_bw = 407 MB/sec send_bw = 398 MB/sec\n recv_bw = 403 MB/sec recv_bw = 312 MB/sec recv_bw = 343 MB/sec\nudp_bw: \n send_bw = 555 MB/sec send_bw = 561 MB/sec send_bw = 557 MB/sec\n recv_bw = 354 MB/sec recv_bw = 368 MB/sec recv_bw = 360 MB/sec\nudp_bw: \n send_bw = 877 MB/sec send_bw = 880 MB/sec send_bw = 868 MB/sec\n recv_bw = 551 MB/sec recv_bw = 542 MB/sec recv_bw = 562 MB/sec\nudp_bw: \n send_bw = 1.1 GB/sec send_bw = 1.08 GB/sec send_bw = 1.09 GB/sec\n recv_bw = 805 MB/sec recv_bw = 785 MB/sec recv_bw = 766 MB/sec\nudp_bw: \n send_bw = 1.21 GB/sec send_bw = 1.19 GB/sec send_bw = 1.22 GB/sec\n recv_bw = 899 MB/sec recv_bw = 715 MB/sec recv_bw = 700 MB/sec\nudp_bw: \n send_bw = 1.31 GB/sec send_bw = 1.31 GB/sec send_bw = 1.31 GB/sec\n recv_bw = 614 MB/sec recv_bw = 622 MB/sec recv_bw = 661 MB/sec\nudp_bw: \n send_bw = 0 bytes/sec send_bw = 0 bytes/sec send_bw = 0 bytes/sec\n recv_bw = 0 bytes/sec recv_bw = 0 bytes/sec recv_bw = 0 bytes/sec\nudp_lat: \n latency = 25.9 us latency = 26.5 us latency = 26.5 us\nudp_lat: \n latency = 26.3 us latency = 26.4 us latency = 26.5 us\nudp_lat: \n latency = 26 us latency = 26.4 us latency = 26.6 us\nudp_lat: \n latency = 26.1 us latency = 26.2 us latency = 26.4 us\nudp_lat: \n latency = 26.3 us latency = 26.5 us latency = 26.7 us\nudp_lat: \n latency = 26.3 us latency = 26.4 us latency = 26.5 us\nudp_lat: \n latency = 26.3 us latency = 26.7 us latency = 26.9 us\nudp_lat: \n latency = 27.1 us latency = 27.1 us latency = 27.2 us\nudp_lat: \n latency = 27.5 us latency = 27.8 us latency = 28.1 us\nudp_lat: \n latency = 28.7 us latency = 28.9 us latency = 29.1 us\nudp_lat: \n latency = 30.4 us latency = 30.5 us latency = 30.9 us\nudp_lat: \n latency = 41.2 us latency = 41.3 us latency = 41.1 us\nudp_lat: \n latency = 41.3 us latency = 41.5 us latency = 41.5 us\nudp_lat: \n latency = 64.4 us latency = 64.5 us latency = 64.2 us\nudp_lat: \n latency = 71.5 us latency = 71.5 us latency = 71.7 us\nudp_lat: \n latency = 120 us latency = 120 us latency = 120 us\nudp_lat: \n latency = 0 ns latency = 0 ns latency = 0 ns\n\n lib/netdev-dpdk.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++---\n 1 file changed, 75 insertions(+), 4 deletions(-)","diff":"diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c\nindex f58e9be..0f91def 100644\n--- a/lib/netdev-dpdk.c\n+++ b/lib/netdev-dpdk.c\n@@ -31,6 +31,7 @@\n #include \n #include \n #include \n+#include \n #include \n #include \n #include \n@@ -992,8 +993,7 @@ netdev_dpdk_vhost_construct(struct netdev *netdev)\n \n err = rte_vhost_driver_disable_features(dev->vhost_id,\n 1ULL << VIRTIO_NET_F_HOST_TSO4\n- | 1ULL << VIRTIO_NET_F_HOST_TSO6\n- | 1ULL << VIRTIO_NET_F_CSUM);\n+ | 1ULL << VIRTIO_NET_F_HOST_TSO6);\n if (err) {\n VLOG_ERR(\"rte_vhost_driver_disable_features failed for vhost user \"\n \"port: %s\\n\", name);\n@@ -1455,6 +1455,76 @@ netdev_dpdk_rxq_dealloc(struct netdev_rxq *rxq)\n rte_free(rx);\n }\n \n+static inline void\n+netdev_dpdk_vhost_refill_l4_cksum(const char *data, struct dp_packet *pkt,\n+ uint8_t l4_proto, bool is_ipv4)\n+{\n+ void *l3hdr = (void *)(data + pkt->mbuf.l2_len);\n+\n+ if (l4_proto == IPPROTO_TCP) {\n+ struct tcp_header *tcp_hdr = (struct tcp_header *)(data +\n+ pkt->mbuf.l2_len + pkt->mbuf.l3_len);\n+\n+ tcp_hdr->tcp_csum = 0;\n+ if (is_ipv4) {\n+ tcp_hdr->tcp_csum = rte_ipv4_udptcp_cksum(l3hdr, tcp_hdr);\n+ } else {\n+ tcp_hdr->tcp_csum = rte_ipv6_udptcp_cksum(l3hdr, tcp_hdr);\n+ }\n+ } else if (l4_proto == IPPROTO_UDP) {\n+ struct udp_header *udp_hdr = (struct udp_header *)(data +\n+ pkt->mbuf.l2_len + pkt->mbuf.l3_len);\n+ /* do not recalculate udp cksum if it was 0 */\n+ if (udp_hdr->udp_csum != 0) {\n+ udp_hdr->udp_csum = 0;\n+ if (is_ipv4) {\n+ /*do not calculate udp cksum if it was a fragment IP*/\n+ if (IP_IS_FRAGMENT(((struct ipv4_hdr *)l3hdr)->\n+ fragment_offset)) {\n+ return;\n+ }\n+\n+ udp_hdr->udp_csum = rte_ipv4_udptcp_cksum(l3hdr, udp_hdr);\n+ } else {\n+ udp_hdr->udp_csum = rte_ipv6_udptcp_cksum(l3hdr, udp_hdr);\n+ }\n+ }\n+ }\n+\n+ pkt->mbuf.ol_flags &= ~PKT_TX_L4_MASK;\n+}\n+\n+static inline void\n+netdev_dpdk_vhost_tx_csum(struct dp_packet **pkts, int pkt_cnt)\n+{\n+ int i;\n+\n+ for (i = 0; i < pkt_cnt; i++) {\n+ ovs_be16 dl_type;\n+ struct dp_packet *pkt = (struct dp_packet *)pkts[i];\n+ const char *data = dp_packet_data(pkt);\n+ void *l3hdr = (char *)(data + pkt->mbuf.l2_len);\n+\n+ if (!(pkt->mbuf.ol_flags & PKT_TX_L4_MASK)) {\n+ /* DPDK vhost tags PKT_TX_L4_MASK if a L4 packet need cksum. */\n+ continue;\n+ }\n+\n+ if (OVS_UNLIKELY(pkt->mbuf.l2_len == 0 || pkt->mbuf.l3_len == 0)) {\n+ continue;\n+ }\n+\n+ dl_type = *(ovs_be16 *)(data + pkt->mbuf.l2_len - sizeof dl_type);\n+ if (dl_type == htons(ETH_TYPE_IP)) {\n+ uint8_t l4_proto = ((struct ipv4_hdr *)l3hdr)->next_proto_id;\n+ netdev_dpdk_vhost_refill_l4_cksum(data, pkt, l4_proto, true);\n+ } else if (dl_type == htons(ETH_TYPE_IPV6)) {\n+ uint8_t l4_proto = ((struct ipv6_hdr *)l3hdr)->proto;\n+ netdev_dpdk_vhost_refill_l4_cksum(data, pkt, l4_proto, false);\n+ }\n+ }\n+}\n+\n /* Tries to transmit 'pkts' to txq 'qid' of device 'dev'. Takes ownership of\n * 'pkts', even in case of failure.\n *\n@@ -1646,6 +1716,8 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,\n \n dp_packet_batch_init_cutlen(batch);\n batch->count = (int) nb_rx;\n+ netdev_dpdk_vhost_tx_csum(batch->packets, batch->count);\n+\n return 0;\n }\n \n@@ -3288,8 +3360,7 @@ netdev_dpdk_vhost_client_reconfigure(struct netdev *netdev)\n \n err = rte_vhost_driver_disable_features(dev->vhost_id,\n 1ULL << VIRTIO_NET_F_HOST_TSO4\n- | 1ULL << VIRTIO_NET_F_HOST_TSO6\n- | 1ULL << VIRTIO_NET_F_CSUM);\n+ | 1ULL << VIRTIO_NET_F_HOST_TSO6);\n if (err) {\n VLOG_ERR(\"rte_vhost_driver_disable_features failed for vhost user \"\n \"client port: %s\\n\", dev->up.name);\n","prefixes":["ovs-dev","v4"]}