Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 698 insertions, 0 deletions

diff --git a/tools/verification/rv/src/in_kernel.c b/tools/verification/rv/src/in_kernel.c
new file mode 100644
index 000000000..50848d79b
--- /dev/null
+++ b/tools/verification/rv/src/in_kernel.c
@@ -0,0 +1,698 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * in kernel monitor support: allows rv to control in-kernel monitors.
+ *
+ * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <trace.h>
+#include <utils.h>
+#include <rv.h>
+
+static int config_has_id;
+static int config_my_pid;
+static int config_trace;
+
+static char *config_initial_reactor;
+static char *config_reactor;
+
+/*
+ * __ikm_read_enable - reads monitor's enable status
+ *
+ * __does not log errors.
+ *
+ * Returns the current status, or -1 if the monitor does not exist,
+ * __hence not logging errors.
+ */
+static int __ikm_read_enable(char *monitor_name)
+{
+	char path[MAX_PATH];
+	long long enabled;
+	int retval;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
+
+	retval = tracefs_instance_file_read_number(NULL, path, &enabled);
+	if (retval < 0)
+		return -1;
+
+	return enabled;
+}
+
+/*
+ * ikm_read_enable - reads monitor's enable status
+ *
+ * Returns the current status, or -1 on error.
+ */
+static int ikm_read_enable(char *monitor_name)
+{
+	int enabled;
+
+	enabled = __ikm_read_enable(monitor_name);
+	if (enabled < 0) {
+		err_msg("ikm: fail read enabled: %d\n", enabled);
+		return -1;
+	}
+
+	debug_msg("ikm: read enabled: %d\n", enabled);
+
+	return enabled;
+}
+
+/*
+ * ikm_write_enable - write to the monitor's enable file
+ *
+ * Return the number of bytes written, -1 on error.
+ */
+static int ikm_write_enable(char *monitor_name, char *enable_disable)
+{
+	char path[MAX_PATH];
+	int retval;
+
+	debug_msg("ikm: writing enabled: %s\n", enable_disable);
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
+	retval = tracefs_instance_file_write(NULL, path, enable_disable);
+	if (retval < strlen(enable_disable)) {
+		err_msg("ikm: writing enabled: %s\n", enable_disable);
+		return -1;
+	}
+
+	return retval;
+}
+
+/*
+ * ikm_enable - enable a monitor
+ *
+ * Returns -1 on failure. Success otherwise.
+ */
+static int ikm_enable(char *monitor_name)
+{
+	return ikm_write_enable(monitor_name, "1");
+}
+
+/*
+ * ikm_disable - disable a monitor
+ *
+ * Returns -1 on failure. Success otherwise.
+ */
+static int ikm_disable(char *monitor_name)
+{
+	return ikm_write_enable(monitor_name, "0");
+}
+
+/*
+ * ikm_read_desc - read monitors' description
+ *
+ * Return a dynamically allocated string with the monitor's
+ * description, NULL otherwise.
+ */
+static char *ikm_read_desc(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *desc;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name);
+	desc = tracefs_instance_file_read(NULL, path, NULL);
+	if (!desc) {
+		err_msg("ikm: error reading monitor %s desc\n", monitor_name);
+		return NULL;
+	}
+
+	*strstr(desc, "\n") = '\0';
+
+	return desc;
+}
+
+/*
+ * ikm_fill_monitor_definition - fill monitor's definition
+ *
+ * Returns -1 on error, 0 otherwise.
+ */
+static int ikm_fill_monitor_definition(char *name, struct monitor *ikm)
+{
+	int enabled;
+	char *desc;
+
+	enabled = ikm_read_enable(name);
+	if (enabled < 0) {
+		err_msg("ikm: monitor %s fail to read enable file, bug?\n", name);
+		return -1;
+	}
+
+	desc = ikm_read_desc(name);
+	if (!desc) {
+		err_msg("ikm: monitor %s does not have desc file, bug?\n", name);
+		return -1;
+	}
+
+	strncpy(ikm->name, name, MAX_DA_NAME_LEN);
+	ikm->enabled = enabled;
+	strncpy(ikm->desc, desc, MAX_DESCRIPTION);
+
+	free(desc);
+
+	return 0;
+}
+
+/*
+ * ikm_write_reactor - switch the reactor to *reactor
+ *
+ * Return the number or characters written, -1 on error.
+ */
+static int ikm_write_reactor(char *monitor_name, char *reactor)
+{
+	char path[MAX_PATH];
+	int retval;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
+	retval = tracefs_instance_file_write(NULL, path, reactor);
+	debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval);
+
+	return retval;
+}
+
+/*
+ * ikm_read_reactor - read the reactors file
+ *
+ * Returns a dynamically allocated string with monitor's
+ * available reactors, or NULL on error.
+ */
+static char *ikm_read_reactor(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *reactors;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
+	reactors = tracefs_instance_file_read(NULL, path, NULL);
+	if (!reactors) {
+		err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name);
+		return NULL;
+	}
+
+	return reactors;
+}
+
+/*
+ * ikm_get_current_reactor - get the current enabled reactor
+ *
+ * Reads the reactors file and find the currently enabled
+ * [reactor].
+ *
+ * Returns a dynamically allocated memory with the current
+ * reactor. NULL otherwise.
+ */
+static char *ikm_get_current_reactor(char *monitor_name)
+{
+	char *reactors = ikm_read_reactor(monitor_name);
+	char *start;
+	char *end;
+	char *curr_reactor;
+
+	if (!reactors)
+		return NULL;
+
+	start = strstr(reactors, "[");
+	if (!start)
+		goto out_free;
+
+	start++;
+
+	end = strstr(start, "]");
+	if (!end)
+		goto out_free;
+
+	*end = '\0';
+
+	curr_reactor = calloc(strlen(start) + 1, sizeof(char));
+	if (!curr_reactor)
+		goto out_free;
+
+	strncpy(curr_reactor, start, strlen(start));
+	debug_msg("ikm: read current reactor %s\n", curr_reactor);
+
+out_free:
+	free(reactors);
+
+	return curr_reactor;
+}
+
+static int ikm_has_id(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *format;
+	int has_id;
+
+	snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name);
+	format = tracefs_instance_file_read(NULL, path, NULL);
+	if (!format) {
+		err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name);
+		return -1;
+	}
+
+	/* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */
+	has_id = !!strstr(format, "REC->id");
+
+	debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no");
+
+	free(format);
+
+	return has_id;
+}
+
+/**
+ * ikm_list_monitors - list all available monitors
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int ikm_list_monitors(void)
+{
+	char *available_monitors;
+	struct monitor ikm;
+	char *curr, *next;
+	int retval;
+
+	available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL);
+
+	if (!available_monitors) {
+		err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n");
+		return -1;
+	}
+
+	curr = available_monitors;
+	do {
+		next = strstr(curr, "\n");
+		*next = '\0';
+
+		retval = ikm_fill_monitor_definition(curr, &ikm);
+		if (retval)
+			err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr);
+
+		printf("%-24s %s %s\n", ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]");
+		curr = ++next;
+
+	} while (strlen(curr));
+
+	free(available_monitors);
+
+	return 0;
+}
+
+static void ikm_print_header(struct trace_seq *s)
+{
+	trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE");
+	if (config_has_id)
+		trace_seq_printf(s, "%8s ", "ID");
+
+	trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
+			 "STATE",
+			 "EVENT",
+			 "NEXT_STATE",
+			 "FINAL");
+
+	trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | ");
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8s ", " | ");
+
+	trace_seq_printf(s, "%24s   %-24s    %-24s %s\n",
+			 " | ",
+			 " | ",
+			 " | ",
+			 "|");
+
+}
+
+/*
+ * ikm_event_handler - callback to handle event events
+ *
+ * Called any time a rv:"monitor"_event events is generated.
+ * It parses and print event.
+ */
+static int
+ikm_event_handler(struct trace_seq *s, struct tep_record *record,
+		  struct tep_event *trace_event, void *context)
+{
+	/* if needed: struct trace_instance *inst = context; */
+	char *state, *event, *next_state;
+	unsigned long long final_state;
+	unsigned long long pid;
+	unsigned long long id;
+	int cpu = record->cpu;
+	int val;
+
+	if (config_has_id)
+		tep_get_field_val(s, trace_event, "id", record, &id, 1);
+
+	tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
+
+	if (config_has_id && (config_my_pid == id))
+		return 0;
+	else if (config_my_pid && (config_my_pid == pid))
+		return 0;
+
+	tep_print_event(trace_event->tep, s, record, "%16s-%-8d ", TEP_PRINT_COMM, TEP_PRINT_PID);
+
+	trace_seq_printf(s, "[%.3d] event ", cpu);
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8llu ", id);
+
+	state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
+	event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
+	next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0);
+	tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1);
+
+	trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
+			 state,
+			 event,
+			 next_state,
+			 final_state ? "Y" : "N");
+
+	trace_seq_do_printf(s);
+	trace_seq_reset(s);
+
+	return 0;
+}
+
+/*
+ * ikm_error_handler - callback to handle error events
+ *
+ * Called any time a rv:"monitor"_errors events is generated.
+ * It parses and print event.
+ */
+static int
+ikm_error_handler(struct trace_seq *s, struct tep_record *record,
+		  struct tep_event *trace_event, void *context)
+{
+	unsigned long long pid, id;
+	int cpu = record->cpu;
+	char *state, *event;
+	int val;
+
+	if (config_has_id)
+		tep_get_field_val(s, trace_event, "id", record, &id, 1);
+
+	tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
+
+	if (config_has_id && config_my_pid == id)
+		return 0;
+	else if (config_my_pid == pid)
+		return 0;
+
+	trace_seq_printf(s, "%8lld [%03d] error ", pid, cpu);
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8llu ", id);
+
+	state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
+	event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
+
+	trace_seq_printf(s, "%24s x %s\n", state, event);
+
+	trace_seq_do_printf(s);
+	trace_seq_reset(s);
+
+	return 0;
+}
+
+/*
+ * ikm_setup_trace_instance - set up a tracing instance to collect data
+ *
+ * Create a trace instance, enable rv: events and enable the trace.
+ *
+ * Returns the trace_instance * with all set, NULL otherwise.
+ */
+static struct trace_instance *ikm_setup_trace_instance(char *monitor_name)
+{
+	char event[MAX_DA_NAME_LEN + 7]; /* max(error_,event_) + '0' = 7 */
+	struct trace_instance *inst;
+	int retval;
+
+	if (!config_trace)
+		return NULL;
+
+	config_has_id = ikm_has_id(monitor_name);
+	if (config_has_id < 0) {
+		err_msg("ikm: failed to read monitor %s event format\n", monitor_name);
+		goto out_err;
+	}
+
+	/* alloc data */
+	inst = calloc(1, sizeof(*inst));
+	if (!inst) {
+		err_msg("ikm: failed to allocate trace instance");
+		goto out_err;
+	}
+
+	retval = trace_instance_init(inst, monitor_name);
+	if (retval)
+		goto out_free;
+
+	/* enable events */
+	snprintf(event, sizeof(event), "event_%s", monitor_name);
+	retval = tracefs_event_enable(inst->inst, "rv",  event);
+	if (retval)
+		goto out_inst;
+
+	tep_register_event_handler(inst->tep, -1, "rv", event,
+				   ikm_event_handler, NULL);
+
+	snprintf(event, sizeof(event), "error_%s", monitor_name);
+	retval = tracefs_event_enable(inst->inst, "rv", event);
+	if (retval)
+		goto out_inst;
+
+	tep_register_event_handler(inst->tep, -1, "rv", event,
+				   ikm_error_handler, NULL);
+
+	/* ready to enable */
+	tracefs_trace_on(inst->inst);
+
+	return inst;
+
+out_inst:
+	trace_instance_destroy(inst);
+out_free:
+	free(inst);
+out_err:
+	return NULL;
+}
+
+/**
+ * ikm_destroy_trace_instance - destroy a previously created instance
+ */
+static void ikm_destroy_trace_instance(struct trace_instance *inst)
+{
+	if (!inst)
+		return;
+
+	trace_instance_destroy(inst);
+	free(inst);
+}
+
+/*
+ * ikm_usage_print_reactors - print all available reactors, one per line.
+ */
+static void ikm_usage_print_reactors(void)
+{
+	char *reactors = tracefs_instance_file_read(NULL, "rv/available_reactors", NULL);
+	char *start, *end;
+
+	if (!reactors)
+		return;
+
+	fprintf(stderr, "  available reactors:");
+
+	start = reactors;
+	end = strstr(start, "\n");
+
+	while (end) {
+		*end = '\0';
+
+		fprintf(stderr, " %s", start);
+
+		start = ++end;
+		end = strstr(start, "\n");
+	};
+
+	fprintf(stderr, "\n");
+}
+/*
+ * ikm_usage - print usage
+ */
+static void ikm_usage(int exit_val, char *monitor_name, const char *fmt, ...)
+{
+
+	char message[1024];
+	va_list ap;
+	int i;
+
+	static const char *const usage[] = {
+		"",
+		"	-h/--help: print this menu and the reactor list",
+		"	-r/--reactor 'reactor': enables the 'reactor'",
+		"	-s/--self: when tracing (-t), also trace rv command",
+		"	-t/--trace: trace monitor's event",
+		"	-v/--verbose: print debug messages",
+		"",
+		NULL,
+	};
+
+	va_start(ap, fmt);
+	vsnprintf(message, sizeof(message), fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "  %s\n", message);
+
+	fprintf(stderr, "\n  usage: rv mon %s [-h] [-q] [-r reactor] [-s] [-v]", monitor_name);
+
+	for (i = 0; usage[i]; i++)
+		fprintf(stderr, "%s\n", usage[i]);
+
+	ikm_usage_print_reactors();
+	exit(exit_val);
+}
+
+/*
+ * parse_arguments - parse arguments and set config
+ */
+static int parse_arguments(char *monitor_name, int argc, char **argv)
+{
+	int c, retval;
+
+	config_my_pid = getpid();
+
+	while (1) {
+		static struct option long_options[] = {
+			{"help",		no_argument,		0, 'h'},
+			{"reactor",		required_argument,	0, 'r'},
+			{"self",		no_argument,		0, 's'},
+			{"trace",		no_argument,		0, 't'},
+			{"verbose",		no_argument,		0, 'v'},
+			{0, 0, 0, 0}
+		};
+
+		/* getopt_long stores the option index here. */
+		int option_index = 0;
+
+		c = getopt_long(argc, argv, "hr:stv", long_options, &option_index);
+
+		/* detect the end of the options. */
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			ikm_usage(0, monitor_name, "help:");
+			break;
+		case 'r':
+			config_reactor = optarg;
+			break;
+		case 's':
+			config_my_pid = 0;
+			break;
+		case 't':
+			config_trace = 1;
+			break;
+		case 'v':
+			config_debug = 1;
+			break;
+		}
+	}
+
+	if (config_reactor) {
+		config_initial_reactor = ikm_get_current_reactor(monitor_name);
+		if (!config_initial_reactor)
+			ikm_usage(1, monitor_name,
+				  "ikm: failed to read current reactor, are reactors enabled?");
+
+		retval = ikm_write_reactor(monitor_name, config_reactor);
+		if (retval <= 0)
+			ikm_usage(1, monitor_name,
+				  "ikm: failed to set %s reactor, is it available?",
+				  config_reactor);
+	}
+
+	debug_msg("ikm: my pid is %d\n", config_my_pid);
+
+	return 0;
+}
+
+/**
+ * ikm_run_monitor - apply configs and run the monitor
+ *
+ * Returns 1 if a monitor was found an executed, 0 if no
+ * monitors were found, or -1 on error.
+ */
+int ikm_run_monitor(char *monitor_name, int argc, char **argv)
+{
+	struct trace_instance *inst = NULL;
+	int retval;
+
+	/*
+	 * Check if monitor exists by seeing it is enabled.
+	 */
+	retval = __ikm_read_enable(monitor_name);
+	if (retval < 0)
+		return 0;
+
+	if (retval) {
+		err_msg("ikm: monitor %s (in-kernel) is already enabled\n", monitor_name);
+		return -1;
+	}
+
+	/* we should be good to go */
+	retval = parse_arguments(monitor_name, argc, argv);
+	if (retval)
+		ikm_usage(1, monitor_name, "ikm: failed parsing arguments");
+
+	if (config_trace) {
+		inst = ikm_setup_trace_instance(monitor_name);
+		if (!inst)
+			return -1;
+	}
+
+	retval = ikm_enable(monitor_name);
+	if (retval < 0)
+		goto out_free_instance;
+
+	if (config_trace)
+		ikm_print_header(inst->seq);
+
+	while (!should_stop()) {
+		if (config_trace) {
+			retval = tracefs_iterate_raw_events(inst->tep,
+							    inst->inst,
+							    NULL,
+							    0,
+							    collect_registered_events,
+							    inst);
+			if (retval) {
+				err_msg("ikm: error reading trace buffer\n");
+				break;
+			}
+		}
+
+		sleep(1);
+	}
+
+	ikm_disable(monitor_name);
+	ikm_destroy_trace_instance(inst);
+
+	if (config_reactor && config_initial_reactor)
+		ikm_write_reactor(monitor_name, config_initial_reactor);
+
+	return 1;
+
+out_free_instance:
+	ikm_destroy_trace_instance(inst);
+	if (config_reactor && config_initial_reactor)
+		ikm_write_reactor(monitor_name, config_initial_reactor);
+	return -1;
+}