/*
 * Copyright (C) 2016 Red Hat, Inc.
 * Author: Michael S. Tsirkin <mst@redhat.com>
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 * Command line processing and common functions for ring benchmarking.
 */
#define _GNU_SOURCE
#include <getopt.h>
#include <pthread.h>
#include <assert.h>
#include <sched.h>
#include "main.h"
#include <sys/eventfd.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <limits.h>

int runcycles = 10000000;
int max_outstanding = INT_MAX;
int batch = 1;

bool do_sleep = false;
bool do_relax = false;
bool do_exit = true;

unsigned ring_size = 256;

static int kickfd = -1;
static int callfd = -1;

void notify(int fd)
{
	unsigned long long v = 1;
	int r;

	vmexit();
	r = write(fd, &v, sizeof v);
	assert(r == sizeof v);
	vmentry();
}

void wait_for_notify(int fd)
{
	unsigned long long v = 1;
	int r;

	vmexit();
	r = read(fd, &v, sizeof v);
	assert(r == sizeof v);
	vmentry();
}

void kick(void)
{
	notify(kickfd);
}

void wait_for_kick(void)
{
	wait_for_notify(kickfd);
}

void call(void)
{
	notify(callfd);
}

void wait_for_call(void)
{
	wait_for_notify(callfd);
}

void set_affinity(const char *arg)
{
	cpu_set_t cpuset;
	int ret;
	pthread_t self;
	long int cpu;
	char *endptr;

	if (!arg)
		return;

	cpu = strtol(arg, &endptr, 0);
	assert(!*endptr);

	assert(cpu >= 0 || cpu < CPU_SETSIZE);

	self = pthread_self();
	CPU_ZERO(&cpuset);
	CPU_SET(cpu, &cpuset);

	ret = pthread_setaffinity_np(self, sizeof(cpu_set_t), &cpuset);
	assert(!ret);
}

void poll_used(void)
{
	while (used_empty())
		busy_wait();
}

static void __attribute__((__flatten__)) run_guest(void)
{
	int completed_before;
	int completed = 0;
	int started = 0;
	int bufs = runcycles;
	int spurious = 0;
	int r;
	unsigned len;
	void *buf;
	int tokick = batch;

	for (;;) {
		if (do_sleep)
			disable_call();
		completed_before = completed;
		do {
			if (started < bufs &&
			    started - completed < max_outstanding) {
				r = add_inbuf(0, "Buffer\n", "Hello, world!");
				if (__builtin_expect(r == 0, true)) {
					++started;
					if (!--tokick) {
						tokick = batch;
						if (do_sleep)
							kick_available();
					}

				}
			} else
				r = -1;

			/* Flush out completed bufs if any */
			if (get_buf(&len, &buf)) {
				++completed;
				if (__builtin_expect(completed == bufs, false))
					return;
				r = 0;
			}
		} while (r == 0);
		if (completed == completed_before)
			++spurious;
		assert(completed <= bufs);
		assert(started <= bufs);
		if (do_sleep) {
			if (used_empty() && enable_call())
				wait_for_call();
		} else {
			poll_used();
		}
	}
}

void poll_avail(void)
{
	while (avail_empty())
		busy_wait();
}

static void __attribute__((__flatten__)) run_host(void)
{
	int completed_before;
	int completed = 0;
	int spurious = 0;
	int bufs = runcycles;
	unsigned len;
	void *buf;

	for (;;) {
		if (do_sleep) {
			if (avail_empty() && enable_kick())
				wait_for_kick();
		} else {
			poll_avail();
		}
		if (do_sleep)
			disable_kick();
		completed_before = completed;
		while (__builtin_expect(use_buf(&len, &buf), true)) {
			if (do_sleep)
				call_used();
			++completed;
			if (__builtin_expect(completed == bufs, false))
				return;
		}
		if (completed == completed_before)
			++spurious;
		assert(completed <= bufs);
		if (completed == bufs)
			break;
	}
}

void *start_guest(void *arg)
{
	set_affinity(arg);
	run_guest();
	pthread_exit(NULL);
}

void *start_host(void *arg)
{
	set_affinity(arg);
	run_host();
	pthread_exit(NULL);
}

static const char optstring[] = "";
static const struct option longopts[] = {
	{
		.name = "help",
		.has_arg = no_argument,
		.val = 'h',
	},
	{
		.name = "host-affinity",
		.has_arg = required_argument,
		.val = 'H',
	},
	{
		.name = "guest-affinity",
		.has_arg = required_argument,
		.val = 'G',
	},
	{
		.name = "ring-size",
		.has_arg = required_argument,
		.val = 'R',
	},
	{
		.name = "run-cycles",
		.has_arg = required_argument,
		.val = 'C',
	},
	{
		.name = "outstanding",
		.has_arg = required_argument,
		.val = 'o',
	},
	{
		.name = "batch",
		.has_arg = required_argument,
		.val = 'b',
	},
	{
		.name = "sleep",
		.has_arg = no_argument,
		.val = 's',
	},
	{
		.name = "relax",
		.has_arg = no_argument,
		.val = 'x',
	},
	{
		.name = "exit",
		.has_arg = no_argument,
		.val = 'e',
	},
	{
	}
};

static void help(void)
{
	fprintf(stderr, "Usage: <test> [--help]"
		" [--host-affinity H]"
		" [--guest-affinity G]"
		" [--ring-size R (default: %d)]"
		" [--run-cycles C (default: %d)]"
		" [--batch b]"
		" [--outstanding o]"
		" [--sleep]"
		" [--relax]"
		" [--exit]"
		"\n",
		ring_size,
		runcycles);
}

int main(int argc, char **argv)
{
	int ret;
	pthread_t host, guest;
	void *tret;
	char *host_arg = NULL;
	char *guest_arg = NULL;
	char *endptr;
	long int c;

	kickfd = eventfd(0, 0);
	assert(kickfd >= 0);
	callfd = eventfd(0, 0);
	assert(callfd >= 0);

	for (;;) {
		int o = getopt_long(argc, argv, optstring, longopts, NULL);
		switch (o) {
		case -1:
			goto done;
		case '?':
			help();
			exit(2);
		case 'H':
			host_arg = optarg;
			break;
		case 'G':
			guest_arg = optarg;
			break;
		case 'R':
			ring_size = strtol(optarg, &endptr, 0);
			assert(ring_size && !(ring_size & (ring_size - 1)));
			assert(!*endptr);
			break;
		case 'C':
			c = strtol(optarg, &endptr, 0);
			assert(!*endptr);
			assert(c > 0 && c < INT_MAX);
			runcycles = c;
			break;
		case 'o':
			c = strtol(optarg, &endptr, 0);
			assert(!*endptr);
			assert(c > 0 && c < INT_MAX);
			max_outstanding = c;
			break;
		case 'b':
			c = strtol(optarg, &endptr, 0);
			assert(!*endptr);
			assert(c > 0 && c < INT_MAX);
			batch = c;
			break;
		case 's':
			do_sleep = true;
			break;
		case 'x':
			do_relax = true;
			break;
		case 'e':
			do_exit = true;
			break;
		default:
			help();
			exit(4);
			break;
		}
	}

	/* does nothing here, used to make sure all smp APIs compile */
	smp_acquire();
	smp_release();
	smp_mb();
done:

	if (batch > max_outstanding)
		batch = max_outstanding;

	if (optind < argc) {
		help();
		exit(4);
	}
	alloc_ring();

	ret = pthread_create(&host, NULL, start_host, host_arg);
	assert(!ret);
	ret = pthread_create(&guest, NULL, start_guest, guest_arg);
	assert(!ret);

	ret = pthread_join(guest, &tret);
	assert(!ret);
	ret = pthread_join(host, &tret);
	assert(!ret);
	return 0;
}
2e9b62756323c675a44cb1a1f9dbd&amp;id2=950eabbd6ddedc1b08350b9169a6a51b130ebaaf'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'>Pull networking fixes from David Miller:

 1) GTP fixes from Andreas Schultz (missing genl module alias, clear IP
    DF on transmit).

 2) Netfilter needs to reflect the fwmark when sending resets, from Pau
    Espin Pedrol.

 3) nftable dump OOPS fix from Liping Zhang.

 4) Fix erroneous setting of VIRTIO_NET_HDR_F_DATA_VALID on transmit,
    from Rolf Neugebauer.

 5) Fix build error of ipt_CLUSTERIP when procfs is disabled, from Arnd
    Bergmann.

 6) Fix regression in handling of NETIF_F_SG in harmonize_features(),
    from Eric Dumazet.

 7) Fix RTNL deadlock wrt. lwtunnel module loading, from David Ahern.

 8) tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'include/sound/compress_driver.h')</div><table summary='diffstat' class='diffstat'>