/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * 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 "xmalloc.h"
#include "die.h"
#include "ring_rx.h"
#include "built_in.h"

void destroy_rx_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_RX_RING, &ring->layout,
			 sizeof(ring->layout));
	if (unlikely(ret))
		panic("Cannot destroy the RX_RING: %s!\n", strerror(errno));

	xfree(ring->frames);
}

void setup_rx_ring_layout(int sock, struct ring *ring, unsigned int size,
			  int jumbo_support)
{
	fmemset(&ring->layout, 0, sizeof(ring->layout));

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

	bug_on(ring->layout.tp_block_size < ring->layout.tp_frame_size);
	bug_on((ring->layout.tp_block_size % ring->layout.tp_frame_size) != 0);
	bug_on((ring->layout.tp_block_size % getpagesize()) != 0);
}

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

	set_sockopt_tpacket(sock);
retry:
	ret = setsockopt(sock, SOL_PACKET, PACKET_RX_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 RX_RING!\n");

	ring->mm_len = ring->layout.tp_block_size * ring->layout.tp_block_nr;

	if (verbose) {
		printf("RX: %.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);
	}
}

void mmap_rx_ring(int sock, struct ring *ring)
{
	ring->mm_space = mmap(0, ring->mm_len, PROT_READ | PROT_WRITE,
			      MAP_SHARED | MAP_LOCKED | MAP_POPULATE, sock, 0);
	if (ring->mm_space == MAP_FAILED) {
		destroy_rx_ring(sock, ring);
		panic("Cannot mmap RX_RING!\n");
	}
}

void alloc_rx_ring_frames(struct ring *ring)
{
	int i;
	size_t len = ring->layout.tp_frame_nr * sizeof(*ring->frames);

	ring->frames = xmalloc_aligned(len, CO_CACHE_LINE_SIZE);
	fmemset(ring->frames, 0, len);

	for (i = 0; i < ring->layout.tp_frame_nr; ++i) {
		ring->frames[i].iov_len = ring->layout.tp_frame_size;
		ring->frames[i].iov_base = ring->mm_space +
					   (i * ring->layout.tp_frame_size);
	}
}

void bind_rx_ring(int sock, struct ring *ring, int ifindex)
{
	int ret;
	/*
	 * The RX_RING registers itself to the networking stack with
	 * dev_add_pack(), so we have one single RX_RING for all devs
	 * otherwise you'll get the packet twice.
	 */
	fmemset(&ring->s_ll, 0, sizeof(ring->s_ll));

	ring->s_ll.sll_family = AF_PACKET;
	ring->s_ll.sll_protocol = htons(ETH_P_ALL);
	ring->s_ll.sll_ifindex = ifindex;
	ring->s_ll.sll_hatype = 0;
	ring->s_ll.sll_halen = 0;
	ring->s_ll.sll_pkttype = 0;

	ret = bind(sock, (struct sockaddr *) &ring->s_ll, sizeof(ring->s_ll));
	if (ret < 0) {
		destroy_rx_ring(sock, ring);
		panic("Cannot bind RX_RING!\n");
	}
}
abel'>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>Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;</td><td class='right'>2016-07-18 13:15:14 +0300</td></tr>
<tr><th>committer</th><td>Daniel Vetter &lt;daniel.vetter@ffwll.ch&gt;</td><td class='right'>2016-07-18 14:33:09 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0'>c71d4d58981bed3366769ef5cf1f20e588fe16d0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0'>37d91fa66bc6328313e32b881d5d0fa0d2dffbf9</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0'>Documentation</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=aeddda06c1a704bb97c8a7bfe7a472120193bd56'>aeddda06c1a704bb97c8a7bfe7a472120193bd56</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0&amp;id2=aeddda06c1a704bb97c8a7bfe7a472120193bd56'>diff</a>)</td></tr></table>
<div class='commit-subject'>drm/i915: Treat eDP as always connected, again</div><div class='commit-msg'>eDP should be treated as connected even if doesn't have an EDID. In that
case we'll use the timings from the VBT. That used to be the case until
commit f21a21983ef1 ("drm/i915: Splitting intel_dp_detect")
broke things by considering even eDP disconnected if we fail to get
an EDID for it.

Fix things up again by treating eDP as always connected.

Cc: Shubhangi Shrivastava &lt;shubhangi.shrivastava@intel.com&gt;
Cc: Nathan D Ciobanu &lt;nathan.d.ciobanu@intel.com&gt;
Cc: Sivakumar Thulasimani &lt;sivakumar.thulasimani@intel.com&gt;
Cc: Ander Conselvan de Oliveira &lt;conselvan2@gmail.com&gt;
Cc: Larry Finger &lt;larry.finger@lwfinger.net&gt;
Reported-by: Larry Finger &lt;larry.finger@lwfinger.net&gt;
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96675
Cc: drm-intel-fixes@lists.freedesktop.org
Fixes: f21a21983ef1 ("drm/i915: Splitting intel_dp_detect")
Signed-off-by: Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;
Tested-by: Larry Finger &lt;larry.finger@lwfinger.net&gt;
Link: http://patchwork.freedesktop.org/patch/msgid/1468836914-16537-1-git-send-email-ville.syrjala@linux.intel.com
(cherry picked from commit 1b7f2c8b0773d5ccbef43ef38a13ad33136c9679)
Signed-off-by: Daniel Vetter &lt;daniel.vetter@ffwll.ch&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c71d4d58981bed3366769ef5cf1f20e588fe16d0'>Diffstat</a> (limited to 'Documentation')</div><table summary='diffstat' class='diffstat'>