On Fri, Apr 04, 2025 at 12:17:44PM +0200, Eelco Chaudron wrote:
>
>
> On 31 Mar 2025, at 21:27, Adrian Moreno via dev wrote:
>
> > This patch makes it possible to display only succeeded or errored
> > upcalls.
> Hi Adrian,
>
> Small nit below, which if you agree, I can apply on commit. The rest looks
> good.
>
> Thanks,
>
> Eelco
>
> Acked-by: Eelco Chaudron <[email protected]>
> > Signed-off-by: Adrian Moreno <[email protected]>
> > ---
> > utilities/usdt-scripts/upcall_monitor.py | 64 +++++++++++++++++++-----
> > 1 file changed, 51 insertions(+), 13 deletions(-)
> >
> > diff --git a/utilities/usdt-scripts/upcall_monitor.py
> > b/utilities/usdt-scripts/upcall_monitor.py
> > index 0c2518f54..0785fa4cc 100755
> > --- a/utilities/usdt-scripts/upcall_monitor.py
> > +++ b/utilities/usdt-scripts/upcall_monitor.py
> > @@ -62,6 +62,9 @@
> > # Set maximum packet size to capture, default 64
> > # -w PCAP_FILE, --pcap PCAP_FILE
> > # Write upcall packets to specified pcap file.
> > +# -r, --result {error,ok,any}
> > +# Display only events with the given result,
> > +# default: any
> > #
> > # The following is an example of how to use the script on the running
> > # ovs-vswitchd process with a packet and flow key dump enabled:
> > @@ -114,7 +117,7 @@
> > #
> >
> > from bcc import BPF, USDT, USDTException
> > -from os.path import exists
> > +from os.path import exists, join
> > from scapy.all import hexdump, wrpcap
> > from scapy.layers.l2 import Ether
> >
> > @@ -157,6 +160,7 @@ void report_missed_event() {
> > __sync_fetch_and_add(value, 1);
> > }
> >
> > +#if <INSTALL_OVS_UPCALL_RECV_PROBE>
> > int do_trace(struct pt_regs *ctx) {
> > uint64_t addr;
> > uint64_t size;
> > @@ -198,7 +202,9 @@ int do_trace(struct pt_regs *ctx) {
> > events.ringbuf_submit(event, 0);
> > return 0;
> > };
> > +#endif
> >
> > +#if <INSTALL_OVS_UPCALL_DROP_PROBE>
> > struct inflight_upcall {
> > u32 cpu;
> > u32 upcall_type;
> > @@ -264,6 +270,7 @@ int kretprobe__ovs_dp_upcall(struct pt_regs *ctx)
> > events.ringbuf_submit(event, 0);
> > return 0;
> > }
> > +#endif
> > """
> >
> >
> > @@ -526,9 +533,33 @@ def main():
> > parser.add_argument("-w", "--pcap", metavar="PCAP_FILE",
> > help="Write upcall packets to specified pcap
> > file.",
> > type=str, default=None)
> > + parser.add_argument("-r", "--result",
> > + help="Display only events with the given result, "
> > + "default: any",
> > + choices=["error", "ok", "any"], default="any")
> >
> > options = parser.parse_args()
> >
> > + #
> > + # Check if current kernel supports error reporting.
> > + #
> > + tracefs_paths = ("/sys/kernel/debug/tracing/", "/sys/kernel/tracing/")
> > + upcall_tp_found = False
> > + for tracefs in tracefs_paths:
> > + if exists(join(tracefs, "events/openvswitch/ovs_dp_upcall")):
> > + upcall_tp_found = True
>
> nit: I think we can add a break here.
>
Absolutely, good catch!
> > +
> > + if not upcall_tp_found:
> > + if options.result == "error":
> > + print("ERROR: Monitoring error upcalls is not supported by the
> > "
> > + "running kernel (or the tracefs is not mounted).")
> > + sys.exit(-1)
> > + if options.result == "any":
> > + print("WARN: Monitoring error upcalls is not supported by the "
> > + "running kernel (or the tracefs is not mounted). "
> > + "Only successful ones will be monitored.")
> > + options.result = "ok"
> > +
> > #
> > # Find the PID of the ovs-vswitchd daemon if not specified.
> > #
> > @@ -560,20 +591,23 @@ def main():
> > #
> > # Attach the usdt probe
> > #
> > - u = USDT(pid=int(options.pid))
> > - try:
> > - u.enable_probe(probe="recv_upcall", fn_name="do_trace")
> > - except USDTException as e:
> > - print("ERROR: {}"
> > - "ovs-vswitchd!".format(
> > - (re.sub('^', ' ' * 7, str(e),
> > flags=re.MULTILINE)).strip().
> > - replace("--with-dtrace or --enable-dtrace",
> > - "--enable-usdt-probes")))
> > - sys.exit(-1)
> > + usdt = []
> > + if options.result in ["ok", "any"]:
> > + u = USDT(pid=int(options.pid))
> > + try:
> > + u.enable_probe(probe="recv_upcall", fn_name="do_trace")
> > + usdt.append(u)
> > + except USDTException as e:
> > + print("ERROR: {}"
> > + "ovs-vswitchd!".format(
> > + (re.sub('^', ' ' * 7, str(e), flags=re.MULTILINE)).
> > + strip().replace("--with-dtrace or --enable-dtrace",
> > + "--enable-usdt-probes")))
> > + sys.exit(-1)
> >
> > #
> > # Uncomment to see how arguments are decoded.
> > - # print(u.get_text())
> > + # print(u.get_text())
> > #
> >
> > #
> > @@ -583,8 +617,12 @@ def main():
> > source = source.replace("<MAX_KEY_VAL>", str(options.flow_key_size))
> > source = source.replace("<BUFFER_PAGE_CNT>",
> > str(options.buffer_page_count))
> > + source = source.replace("<INSTALL_OVS_UPCALL_RECV_PROBE>", "1"
> > + if options.result in ["ok", "any"] else "0")
> > + source = source.replace("<INSTALL_OVS_UPCALL_DROP_PROBE>", "1"
> > + if options.result in ["error", "any"] else "0")
> >
> > - b = BPF(text=source, usdt_contexts=[u], debug=options.debug)
> > + b = BPF(text=source, usdt_contexts=usdt, debug=options.debug)
> >
> > #
> > # Print header
> > --
> > 2.48.1
> >
> > _______________________________________________
> > dev mailing list
> > [email protected]
> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
>
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