/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Copyright 2009, 2010 Emmanuel Roullit.
 * Subject to the GPL, version 2.
 */

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

static void set_packet_loss_discard(int sock)
{
	int ret, discard = 1;
	ret = setsockopt(sock, SOL_PACKET, PACKET_LOSS, (void *) &discard,
			 sizeof(discard));
	if (ret < 0)
		panic("setsockopt: cannot set packet loss");
}

void destroy_tx_ring(int sock, struct ring *ring)
{
	int ret;

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

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

	xfree(ring->frames);
}

static void setup_tx_ring_layout(int sock, struct ring *ring, size_t size,
				 bool jumbo_support)
{
	fmemset(&ring->layout, 0, sizeof(ring->layout));

	ring->layout.tp_block_size = (jumbo_support ?
				      RUNTIME_PAGE_SIZE << 4 :
				      RUNTIME_PAGE_SIZE << 2);

	ring->layout.tp_frame_size = (jumbo_support ?
				      TPACKET_ALIGNMENT << 12 :
				      TPACKET_ALIGNMENT << 7);

	ring->layout.tp_block_nr = size / ring->layout.tp_block_size;
	ring->layout.tp_frame_nr = ring->layout.tp_block_size /
				   ring->layout.tp_frame_size *
				   ring->layout.tp_block_nr;

	set_sockopt_tpacket_v2(sock);

	ring_verify_layout(ring);
}

static void create_tx_ring(int sock, struct ring *ring, bool verbose)
{
	int ret;
retry:
	ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
			 sizeof(ring->layout));

	if (errno == ENOMEM && ring->layout.tp_block_nr > 1) {
		ring->layout.tp_block_nr >>= 1;
		ring->layout.tp_frame_nr = ring->layout.tp_block_size / 
					   ring->layout.tp_frame_size * 
					   ring->layout.tp_block_nr;
		goto retry;
	}

	if (ret < 0)
		panic("Cannot allocate TX_RING!\n");

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

	if (verbose) {
		printf("TX,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);
	}
}

static void alloc_tx_ring_frames(int sock __maybe_unused, struct ring *ring)
{
	alloc_ring_frames_generic(ring, ring->layout.tp_frame_nr,
				  ring->layout.tp_frame_size);
}

void ring_tx_setup(struct ring *ring, int sock, size_t size, int ifindex,
		   bool jumbo_support, bool verbose)
{
	fmemset(ring, 0, sizeof(*ring));
	set_packet_loss_discard(sock);
	setup_tx_ring_layout(sock, ring, size, jumbo_support);
	create_tx_ring(sock, ring, verbose);
	mmap_ring_generic(sock, ring);
	alloc_tx_ring_frames(sock, ring);
	bind_ring_generic(sock, ring, ifindex, true);
}
label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;</td><td class='right'>2016-09-28 13:45:38 -0300</td></tr>
<tr><th>committer</th><td>Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;</td><td class='right'>2016-09-28 13:48:04 -0300</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=f0bbd602268e69f4f428075c645391d64bdd6c9f'>f0bbd602268e69f4f428075c645391d64bdd6c9f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=f0bbd602268e69f4f428075c645391d64bdd6c9f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=f0bbd602268e69f4f428075c645391d64bdd6c9f'>718a2af28176ca8185a82f513f6b6e85695357fe</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=f2c8852e6e990fcab0d9e68de9d86e5fbea0b5dc'>f2c8852e6e990fcab0d9e68de9d86e5fbea0b5dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=f0bbd602268e69f4f428075c645391d64bdd6c9f&amp;id2=f2c8852e6e990fcab0d9e68de9d86e5fbea0b5dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>perf trace: Beautify sched_[gs]et_attr return value</div><div class='commit-msg'>Both return errno, show the string associated then.

More work needed to capture the sched_attr arg to beautify it in turn,
probably using BPF.

Before:

     0.210 ( 0.001 ms): sched_setattr(uattr: 0x7ffc684f02b0) = -22

After the patch, for this sched_attr, all other parms are zero, so not
shown:

        struct sched_attr attr = {
                .size           = sizeof(attr),
                .sched_policy   = SCHED_DEADLINE,
                .sched_runtime  = 10 * USECS_PER_SEC,
                .sched_period   = 30 * USECS_PER_SEC,
                .sched_deadline = attr.sched_period,
        };

     0.321 ( 0.002 ms): sched_setattr(uattr: 0x7ffc44116da0) = -1 EINVAL Invalid argument

  [root@jouet c]# perf trace -e sched_setattr ./sched_deadline
  Couldn't negotiate deadline: Invalid argument
     0.229 ( 0.003 ms): sched_setattr(uattr: 0x7ffd8dcd8df0) = -1 EINVAL Invalid argument
  [root@jouet c]#

Now to figure out the reason for this EINVAL.

Cc: Adrian Hunter &lt;adrian.hunter@intel.com&gt;
Cc: Clark Williams &lt;williams@redhat.com&gt;
Cc: Daniel Bristot de Oliveira &lt;bristot@redhat.com&gt;
Cc: David Ahern &lt;dsahern@gmail.com&gt;
Cc: Jiri Olsa &lt;jolsa@kernel.org&gt;
Cc: Namhyung Kim &lt;namhyung@kernel.org&gt;
Cc: Steven Rostedt &lt;rostedt@goodmis.org&gt;
Cc: Wang Nan &lt;wangnan0@huawei.com&gt;
Link: http://lkml.kernel.org/n/tip-tyot2n7e48zm8pdw8tbcm3sl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=f0bbd602268e69f4f428075c645391d64bdd6c9f'>Diffstat</a></div><table summary='diffstat' class='diffstat'>