#!/usr/bin/perl -w
#
# Build a static ASN.1 Object Identified (OID) registry
#
# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#

use strict;

my @names = ();
my @oids = ();

if ($#ARGV != 1) {
    print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
    exit(2);
}

#
# Open the file to read from
#
open IN_FILE, "<$ARGV[0]" || die;
while (<IN_FILE>) {
    chomp;
    if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
	push @names, $1;
	push @oids, $2;
    }
}
close IN_FILE || die;

#
# Open the files to write into
#
open C_FILE, ">$ARGV[1]" or die;
print C_FILE "/*\n";
print C_FILE " * Automatically generated by ", $0, ".  Do not edit\n";
print C_FILE " */\n";

#
# Split the data up into separate lists and also determine the lengths of the
# encoded data arrays.
#
my @indices = ();
my @lengths = ();
my $total_length = 0;

for (my $i = 0; $i <= $#names; $i++) {
    my $name = $names[$i];
    my $oid = $oids[$i];

    my @components = split(/[.]/, $oid);

    # Determine the encoded length of this OID
    my $size = $#components;
    for (my $loop = 2; $loop <= $#components; $loop++) {
	my $c = $components[$loop];

	# We will base128 encode the number
	my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
	$tmp = int($tmp / 7);
	$size += $tmp;
    }
    push @lengths, $size;
    push @indices, $total_length;
    $total_length += $size;
}

#
# Emit the look-up-by-OID index table
#
print C_FILE "\n";
if ($total_length <= 255) {
    print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
} else {
    print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
}
for (my $i = 0; $i <= $#names; $i++) {
    print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
}
print C_FILE "\t[OID__NR] = ", $total_length, "\n";
print C_FILE "};\n";

#
# Encode the OIDs
#
my @encoded_oids = ();

for (my $i = 0; $i <= $#names; $i++) {
    my @octets = ();

    my @components = split(/[.]/, $oids[$i]);

    push @octets, $components[0] * 40 + $components[1];

    for (my $loop = 2; $loop <= $#components; $loop++) {
	my $c = $components[$loop];

	# Base128 encode the number
	my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
	$tmp = int($tmp / 7);

	for (; $tmp > 0; $tmp--) {
	    push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
	}
	push @octets, $c & 0x7f;
    }

    push @encoded_oids, \@octets;
}

#
# Create a hash value for each OID
#
my @hash_values = ();
for (my $i = 0; $i <= $#names; $i++) {
    my @octets = @{$encoded_oids[$i]};

    my $hash = $#octets;
    foreach (@octets) {
	$hash += $_ * 33;
    }

    $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);

    push @hash_values, $hash & 0xff;
}

#
# Emit the OID data
#
print C_FILE "\n";
print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
for (my $i = 0; $i <= $#names; $i++) {
    my @octets = @{$encoded_oids[$i]};
    print C_FILE "\t";
    print C_FILE $_, ", " foreach (@octets);
    print C_FILE "\t// ", $names[$i];
    print C_FILE "\n";
}
print C_FILE "};\n";

#
# Build the search index table (ordered by length then hash then content)
#
my @index_table = ( 0 .. $#names );

@index_table = sort {
    my @octets_a = @{$encoded_oids[$a]};
    my @octets_b = @{$encoded_oids[$b]};

    return $hash_values[$a] <=> $hash_values[$b]
	if ($hash_values[$a] != $hash_values[$b]);
    return $#octets_a <=> $#octets_b
	if ($#octets_a != $#octets_b);
    for (my $i = $#octets_a; $i >= 0; $i--) {
	return $octets_a[$i] <=> $octets_b[$i]
	    if ($octets_a[$i] != $octets_b[$i]);
    }
    return 0;

} @index_table;

#
# Emit the search index and hash value table
#
print C_FILE "\n";
print C_FILE "static const struct {\n";
print C_FILE "\tunsigned char hash;\n";
if ($#names <= 255) {
    print C_FILE "\tenum OID oid : 8;\n";
} else {
    print C_FILE "\tenum OID oid : 16;\n";
}
print C_FILE "} oid_search_table[OID__NR] = {\n";
for (my $i = 0; $i <= $#names; $i++) {
    my @octets = @{$encoded_oids[$index_table[$i]]};
    printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
	   $i,
	   $hash_values[$index_table[$i]],
	   $names[$index_table[$i]]);
    printf C_FILE "%02x", $_ foreach (@octets);
    print C_FILE "\n";
}
print C_FILE "};\n";

#
# Emit the OID debugging name table
#
#print C_FILE "\n";
#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
#
#for (my $i = 0; $i <= $#names; $i++) {
#    print C_FILE "\t\"", $names[$i], "\",\n"
#}
#print C_FILE "\t\"Unknown-OID\"\n";
#print C_FILE "};\n";

#
# Polish off
#
close C_FILE or die;
e></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/rdma/ib_sa.h?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/rdma/ib_sa.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>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=030305d69fc6963c16003f50d7e8d74b02d0a143'>363a4e34d199178769b7e7eeb26ea2620a55847b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/rdma/ib_sa.h?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>include/rdma/ib_sa.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/rdma/ib_sa.h?h=nds-private-remove&amp;id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/rdma/ib_sa.h?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143&amp;id2=4d191b1b63c209e37bf27938ef365244d3c41084'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies</div><div class='commit-msg'>In a struct pcie_link_state, link-&gt;root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link-&gt;root = link).  For others, we copy the pointer from the
parent (link-&gt;root = link-&gt;parent-&gt;root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link-&gt;parent-&gt;root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [&lt;ffffffff9e424350&gt;] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link-&gt;root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. &lt;jnair@caviumnetworks.com&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
CC: stable@vger.kernel.org	# v4.2+</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>Diffstat</a> (limited to 'include/rdma/ib_sa.h')</div><table summary='diffstat' class='diffstat'>