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* utilities: Add revalidator measurement script and needed USDT probes.Eelco Chaudron2023-01-271-0/+894
| | | | | | | | | | | | | | | | | | | | This patch adds a Python script that can be used to analyze the revalidator runs by providing statistics (including some real time graphs). The USDT events can also be captured to a file and used for later offline analysis. The following blog explains the Open vSwitch revalidator implementation and how this tool can help you understand what is happening in your system. https://developers.redhat.com/articles/2022/10/19/open-vswitch-revalidator-process-explained Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Acked-by: Adrian Moreno <amorenoz@redhat.com> Acked-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
* utilities: Add USDT script to monitor dpif netlink execute message queuing.Eelco Chaudron2023-01-061-0/+662
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the dpif_nl_exec_monitor.py script that will used the existing dpif_netlink_operate__:op_flow_execute USDT probe to show all DPIF_OP_EXECUTE operations being queued for transmission over the netlink interface. Here is an example, truncated output: Display DPIF_OP_EXECUTE operations being queued for transmission... TIME CPU COMM PID NL_SIZE 3124.516679897 1 ovs-vswitchd 8219 180 nlmsghdr : len = 0, type = 36, flags = 1, seq = 0, pid = 0 genlmsghdr: cmd = 3, version = 1, reserver = 0 ovs_header: dp_ifindex = 21 > Decode OVS_PACKET_ATTR_* TLVs: nla_len 46, nla_type OVS_PACKET_ATTR_PACKET[1], data: 00 00 00... nla_len 20, nla_type OVS_PACKET_ATTR_KEY[2], data: 08 00 02 00... > Decode OVS_KEY_ATTR_* TLVs: nla_len 8, nla_type OVS_KEY_ATTR_PRIORITY[2], data: 00 00... nla_len 8, nla_type OVS_KEY_ATTR_SKB_MARK[15], data: 00 00... nla_len 88, nla_type OVS_PACKET_ATTR_ACTIONS[3], data: 4c 00 03... > Decode OVS_ACTION_ATTR_* TLVs: nla_len 76, nla_type OVS_ACTION_ATTR_SET[3], data: 48 00... > Decode OVS_TUNNEL_KEY_ATTR_* TLVs: nla_len 12, nla_type OVS_TUNNEL_KEY_ATTR_ID[0], data:... nla_len 20, nla_type OVS_TUNNEL_KEY_ATTR_IPV6_DST[13], ... nla_len 5, nla_type OVS_TUNNEL_KEY_ATTR_TTL[4], data: 40 nla_len 4, nla_type OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT[5]... nla_len 4, nla_type OVS_TUNNEL_KEY_ATTR_CSUM[6], data: nla_len 6, nla_type OVS_TUNNEL_KEY_ATTR_TP_DST[10],... nla_len 12, nla_type OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS[8],... nla_len 8, nla_type OVS_ACTION_ATTR_OUTPUT[1], data: 02 00 00 00 - Dumping OVS_PACKET_ATR_PACKET data: ###[ Ethernet ]### dst = 00:00:00:00:ec:01 src = 04:f4:bc:28:57:00 type = IPv4 ###[ IP ]### version = 4 ihl = 5 tos = 0x0 len = 50 id = 0 flags = frag = 0 ttl = 127 proto = icmp chksum = 0x2767 src = 10.0.0.1 dst = 10.0.0.100 \options \ ###[ ICMP ]### type = echo-request code = 0 chksum = 0xf7f3 id = 0x0 seq = 0xc Acked-by: Adrian Moreno <amorenoz@redhat.com> Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
* utilities: Add netlink flow operation USDT probes and upcall_cost script.Eelco Chaudron2022-01-181-0/+1787
| | | | | | | | | | | This patch adds a series of NetLink flow operation USDT probes. These probes are in turn used in the upcall_cost Python script, which in addition of some kernel tracepoints, give an insight into the time spent on processing upcall. Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Acked-by: Paolo Valerio <pvalerio@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
* utilities: Add upcall USDT probe and associated script.Eelco Chaudron2022-01-181-0/+533
| | | | | | | | | | | | | | | | | | | Added the dpif_recv:recv_upcall USDT probe, which is used by the included upcall_monitor.py script. This script receives all upcall packets sent by the kernel to ovs-vswitchd. By default, it will show all upcall events, which looks something like this: TIME CPU COMM PID DPIF_NAME TYPE PKT_LEN FLOW_KEY_LEN 5952147.003848809 2 handler4 1381158 system@ovs-system 0 98 132 5952147.003879643 2 handler4 1381158 system@ovs-system 0 70 160 5952147.003914924 2 handler4 1381158 system@ovs-system 0 98 152 It can also dump the packet and NetLink content, and if required, the packets can also be written to a pcap file. Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Acked-by: Paolo Valerio <pvalerio@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
* Documentation: Add USDT documentation and bpftrace example.Eelco Chaudron2022-01-181-0/+120
Add the USDT documentation and a bpftrace example using the bridge run USDT probes. Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Acked-by: Paolo Valerio <pvalerio@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
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