/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Copyright 2014, 2015 Tobias Klauser.
 * Subject to the GPL, version 2.
 */

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>

#include "xmalloc.h"
#include "die.h"
#include "ring_rx.h"
#include "built_in.h"

/*
 * tpacket v3 data structures and constants are not available for older kernel
 * versions which only support tpacket v2, thus we need protect access to them.
 */
#ifdef HAVE_TPACKET3
static inline bool is_tpacket_v3(int sock)
{
	return get_sockopt_tpacket(sock) == TPACKET_V3;
}

static inline size_t get_ring_layout_size(struct ring *ring, bool v3)
{
	return v3 ? sizeof(ring->layout3) : sizeof(ring->layout);
}

static inline void setup_rx_ring_layout_v3(struct ring *ring)
{
	/* Pass out, if this will ever change and we do crap on it! */
	build_bug_on(offsetof(struct tpacket_req, tp_frame_nr) !=
		     offsetof(struct tpacket_req3, tp_frame_nr) &&
		     sizeof(struct tpacket_req) !=
		     offsetof(struct tpacket_req3, tp_retire_blk_tov));

	ring->layout3.tp_retire_blk_tov = 100; /* 0: let kernel decide */
	ring->layout3.tp_sizeof_priv = 0;
	ring->layout3.tp_feature_req_word = 0;
}

static inline int rx_ring_get_num(struct ring *ring, bool v3)
{
	return v3 ? ring->layout3.tp_block_nr : ring->layout.tp_frame_nr;
}

static inline size_t rx_ring_get_size(struct ring *ring, bool v3)
{
	return v3 ? ring->layout3.tp_block_size : ring->layout.tp_frame_size;
}

int get_rx_net_stats(int sock, uint64_t *packets, uint64_t *drops, bool v3)
{
	int ret;
	union {
		struct tpacket_stats	k2;
		struct tpacket_stats_v3 k3;
	} stats;
	socklen_t slen = v3 ? sizeof(stats.k3) : sizeof(stats.k2);

	memset(&stats, 0, sizeof(stats));
	ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &stats, &slen);
	if (ret == 0) {
		*packets = stats.k3.tp_packets;
		*drops = stats.k3.tp_drops;
	}
	return ret;
}
#else
static inline bool is_tpacket_v3(int sock __maybe_unused)
{
	return false;
}

static inline size_t get_ring_layout_size(struct ring *ring, bool v3 __maybe_unused)
{
	return sizeof(ring->layout);
}

static inline void setup_rx_ring_layout_v3(struct ring *ring __maybe_unused)
{
}

static inline size_t rx_ring_get_num(struct ring *ring, bool v3 __maybe_unused)
{
	return ring->layout.tp_frame_nr;
}

static inline size_t rx_ring_get_size(struct ring *ring, bool v3 __maybe_unused)
{
	return ring->layout.tp_frame_size;
}

int get_rx_net_stats(int sock, uint64_t *packets, uint64_t *drops,
		     bool v3 __maybe_unused)
{
	int ret;
	struct tpacket_stats stats;
	socklen_t slen = sizeof(stats);

	memset(&stats, 0, sizeof(stats));
	ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &stats, &slen);
	if (ret == 0) {
		*packets = stats.tp_packets;
		*drops = stats.tp_drops;
	}
	return ret;
}
#endif /* HAVE_TPACKET3 */

void destroy_rx_ring(int sock, struct ring *ring)
{
	int ret;
	bool v3 = is_tpacket_v3(sock);

	munmap(ring->mm_space, ring->mm_len);
	ring->mm_len = 0;

	xfree(ring->frames);

	/* In general, this is freed during close(2) anyway. */
	if (v3)
		return;

	memset(&ring->layout, 0, sizeof(ring->layout));
	ret = setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &ring->layout,
			 sizeof(ring->layout));
	if (unlikely(ret))
		panic("Cannot destroy the RX_RING: %s!\n", strerror(errno));
}

static void setup_rx_ring_layout(int sock, struct ring *ring, size_t size,
				 bool jumbo_support, bool v3)
{
	setup_ring_layout_generic(ring, size, jumbo_support);

	if (v3) {
		setup_rx_ring_layout_v3(ring);
		set_sockopt_tpacket_v3(sock);
	} else {
		set_sockopt_tpacket_v2(sock);
	}

	ring_verify_layout(ring);
}

static void create_rx_ring(int sock, struct ring *ring, bool verbose)
{
	int ret;
	bool v3 = is_tpacket_v3(sock);
	size_t layout_size = get_ring_layout_size(ring, v3);

retry:
	ret = setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &ring->raw,
			 layout_size);

	if (errno == ENOMEM && ring->layout.tp_block_nr > 1) {
		shrink_ring_layout_generic(ring);
		goto retry;
	}
	if (ret < 0)
		panic("Cannot allocate RX_RING!\n");

	ring->mm_len = (size_t) ring->layout.tp_block_size * ring->layout.tp_block_nr;

	if (verbose) {
		if (!v3) {
			printf("RX,V2: %.2Lf MiB, %u Frames, each %u Byte allocated\n",
			       (long double) ring->mm_len / (1 << 20),
			       ring->layout.tp_frame_nr, ring->layout.tp_frame_size);
		} else {
			printf("RX,V3: %.2Lf MiB, %u Blocks, each %u Byte allocated\n",
			       (long double) ring->mm_len / (1 << 20),
			       ring->layout.tp_block_nr, ring->layout.tp_block_size);
		}
	}
}

static void alloc_rx_ring_frames(int sock, struct ring *ring)
{
	bool v3 = is_tpacket_v3(sock);

	alloc_ring_frames_generic(ring, rx_ring_get_num(ring, v3),
				  rx_ring_get_size(ring, v3));
}

static void join_fanout_group(int sock, uint32_t fanout_group, uint32_t fanout_type)
{
	uint32_t fanout_opt = 0;
	int ret;

	if (fanout_group == 0)
		return;

#if defined(PACKET_FANOUT)
	fanout_opt = (fanout_group & 0xffff) | (fanout_type << 16);

	ret = setsockopt(sock, SOL_PACKET, PACKET_FANOUT, &fanout_opt,
			 sizeof(fanout_opt));
	if (ret < 0)
		panic("Cannot set fanout ring mode!\n");
#else
	panic("fanout ring mode is not available!\n");
#endif
}

void ring_rx_setup(struct ring *ring, int sock, size_t size, int ifindex,
		   struct pollfd *poll, bool v3, bool jumbo_support,
		   bool verbose, uint32_t fanout_group, uint32_t fanout_type)
{
	memset(ring, 0, sizeof(*ring));
	setup_rx_ring_layout(sock, ring, size, jumbo_support, v3);
	create_rx_ring(sock, ring, verbose);
	mmap_ring_generic(sock, ring);
	alloc_rx_ring_frames(sock, ring);
	bind_ring_generic(sock, ring, ifindex, false);
	join_fanout_group(sock, fanout_group, fanout_type);
	prepare_polling(sock, poll);
}
pufreq: intel_pstate: Disable energy efficiency optimization</div><div class='commit-msg'>Some Kabylake desktop processors may not reach max turbo when running in
HWP mode, even if running under sustained 100% utilization.

This occurs when the HWP.EPP (Energy Performance Preference) is set to
"balance_power" (0x80) -- the default on most systems.

It occurs because the platform BIOS may erroneously enable an
energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not
recommended to be enabled on this SKU.

On the failing systems, this BIOS issue was not discovered when the
desktop motherboard was tested with Windows, because the BIOS also
neglects to provide the ACPI/CPPC table, that Windows requires to enable
HWP, and so Windows runs in legacy P-state mode, where this setting has
no effect.

Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and
so it runs in HWP mode, exposing this incorrect BIOS configuration.

There are several ways to address this problem.

First, Linux can also run in legacy P-state mode on this system.
As intel_pstate is how Linux enables HWP, booting with
"intel_pstate=disable"
will run in acpi-cpufreq/ondemand legacy p-state mode.

Or second, the "performance" governor can be used with intel_pstate,
which will modify HWP.EPP to 0.

Or third, starting in 4.10, the
/sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
attribute in can be updated from "balance_power" to "performance".

Or fourth, apply this patch, which fixes the erroneous setting of
MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default
configuration to function as designed.

Signed-off-by: Srinivas Pandruvada &lt;srinivas.pandruvada@linux.intel.com&gt;
Reviewed-by: Len Brown &lt;len.brown@intel.com&gt;
Cc: 4.6+ &lt;stable@vger.kernel.org&gt; # 4.6+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>Diffstat</a> (limited to 'sound/core/Makefile')</div><table summary='diffstat' class='diffstat'>