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test-ovn.c
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/*
* Copyright (c) 2015, 2016 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <errno.h>
#include <getopt.h>
#include <sys/wait.h>
#include "command-line.h"
#include "fatal-signal.h"
#include "flow.h"
#include "openvswitch/dynamic-string.h"
#include "openvswitch/match.h"
#include "openvswitch/ofp-actions.h"
#include "openvswitch/ofpbuf.h"
#include "openvswitch/vlog.h"
#include "ovn/lib/actions.h"
#include "ovn/lib/expr.h"
#include "ovn/lib/lex.h"
#include "ovn/lib/ovn-dhcp.h"
#include "ovs-thread.h"
#include "ovstest.h"
#include "shash.h"
#include "simap.h"
#include "util.h"
/* --relops: Bitmap of the relational operators to test, in exhaustive test. */
static unsigned int test_relops;
/* --nvars: Number of numeric variables to test, in exhaustive test. */
static int test_nvars = 2;
/* --svars: Number of string variables to test, in exhaustive test. */
static int test_svars = 2;
/* --bits: Number of bits per variable, in exhaustive test. */
static int test_bits = 3;
/* --operation: The operation to test, in exhaustive test. */
static enum { OP_CONVERT, OP_SIMPLIFY, OP_NORMALIZE, OP_FLOW } operation
= OP_FLOW;
/* --parallel: Number of parallel processes to use in test. */
static int test_parallel = 1;
/* -m, --more: Message verbosity */
static int verbosity;
static void
compare_token(const struct lex_token *a, const struct lex_token *b)
{
if (a->type != b->type) {
fprintf(stderr, "type differs: %d -> %d\n", a->type, b->type);
return;
}
if (!((a->s && b->s && !strcmp(a->s, b->s))
|| (!a->s && !b->s))) {
fprintf(stderr, "string differs: %s -> %s\n",
a->s ? a->s : "(null)",
b->s ? b->s : "(null)");
return;
}
if (a->type == LEX_T_INTEGER || a->type == LEX_T_MASKED_INTEGER) {
if (memcmp(&a->value, &b->value, sizeof a->value)) {
fprintf(stderr, "value differs\n");
return;
}
if (a->type == LEX_T_MASKED_INTEGER
&& memcmp(&a->mask, &b->mask, sizeof a->mask)) {
fprintf(stderr, "mask differs\n");
return;
}
if (a->format != b->format
&& !(a->format == LEX_F_HEXADECIMAL
&& b->format == LEX_F_DECIMAL
&& a->value.integer == 0)) {
fprintf(stderr, "format differs: %d -> %d\n",
a->format, b->format);
}
}
}
static void
test_lex(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
struct ds input;
struct ds output;
ds_init(&input);
ds_init(&output);
while (!ds_get_test_line(&input, stdin)) {
struct lexer lexer;
lexer_init(&lexer, ds_cstr(&input));
ds_clear(&output);
while (lexer_get(&lexer) != LEX_T_END) {
size_t len = output.length;
lex_token_format(&lexer.token, &output);
/* Check that the formatted version can really be parsed back
* losslessly. */
if (lexer.token.type != LEX_T_ERROR) {
const char *s = ds_cstr(&output) + len;
struct lexer l2;
lexer_init(&l2, s);
lexer_get(&l2);
compare_token(&lexer.token, &l2.token);
lexer_destroy(&l2);
}
ds_put_char(&output, ' ');
}
lexer_destroy(&lexer);
ds_chomp(&output, ' ');
puts(ds_cstr(&output));
}
ds_destroy(&input);
ds_destroy(&output);
}
static void
create_symtab(struct shash *symtab)
{
shash_init(symtab);
/* Reserve a pair of registers for the logical inport and outport. A full
* 32-bit register each is bigger than we need, but the expression code
* doesn't yet support string fields that occupy less than a full OXM. */
expr_symtab_add_string(symtab, "inport", MFF_REG6, NULL);
expr_symtab_add_string(symtab, "outport", MFF_REG7, NULL);
expr_symtab_add_field(symtab, "xreg0", MFF_XREG0, NULL, false);
expr_symtab_add_field(symtab, "xreg1", MFF_XREG1, NULL, false);
expr_symtab_add_field(symtab, "xreg2", MFF_XREG2, NULL, false);
expr_symtab_add_subfield(symtab, "reg0", NULL, "xreg0[32..63]");
expr_symtab_add_subfield(symtab, "reg1", NULL, "xreg0[0..31]");
expr_symtab_add_subfield(symtab, "reg2", NULL, "xreg1[32..63]");
expr_symtab_add_subfield(symtab, "reg3", NULL, "xreg1[0..31]");
expr_symtab_add_subfield(symtab, "reg4", NULL, "xreg2[32..63]");
expr_symtab_add_subfield(symtab, "reg5", NULL, "xreg2[0..31]");
expr_symtab_add_field(symtab, "eth.src", MFF_ETH_SRC, NULL, false);
expr_symtab_add_field(symtab, "eth.dst", MFF_ETH_DST, NULL, false);
expr_symtab_add_field(symtab, "eth.type", MFF_ETH_TYPE, NULL, true);
expr_symtab_add_field(symtab, "vlan.tci", MFF_VLAN_TCI, NULL, false);
expr_symtab_add_predicate(symtab, "vlan.present", "vlan.tci[12]");
expr_symtab_add_subfield(symtab, "vlan.pcp", "vlan.present",
"vlan.tci[13..15]");
expr_symtab_add_subfield(symtab, "vlan.vid", "vlan.present",
"vlan.tci[0..11]");
expr_symtab_add_predicate(symtab, "ip4", "eth.type == 0x800");
expr_symtab_add_predicate(symtab, "ip6", "eth.type == 0x86dd");
expr_symtab_add_predicate(symtab, "ip", "ip4 || ip6");
expr_symtab_add_field(symtab, "ip.proto", MFF_IP_PROTO, "ip", true);
expr_symtab_add_field(symtab, "ip.dscp", MFF_IP_DSCP, "ip", false);
expr_symtab_add_field(symtab, "ip.ecn", MFF_IP_ECN, "ip", false);
expr_symtab_add_field(symtab, "ip.ttl", MFF_IP_TTL, "ip", false);
expr_symtab_add_field(symtab, "ip4.src", MFF_IPV4_SRC, "ip4", false);
expr_symtab_add_field(symtab, "ip4.dst", MFF_IPV4_DST, "ip4", false);
expr_symtab_add_predicate(symtab, "icmp4", "ip4 && ip.proto == 1");
expr_symtab_add_field(symtab, "icmp4.type", MFF_ICMPV4_TYPE, "icmp4",
false);
expr_symtab_add_field(symtab, "icmp4.code", MFF_ICMPV4_CODE, "icmp4",
false);
expr_symtab_add_field(symtab, "ip6.src", MFF_IPV6_SRC, "ip6", false);
expr_symtab_add_field(symtab, "ip6.dst", MFF_IPV6_DST, "ip6", false);
expr_symtab_add_field(symtab, "ip6.label", MFF_IPV6_LABEL, "ip6", false);
expr_symtab_add_predicate(symtab, "icmp6", "ip6 && ip.proto == 58");
expr_symtab_add_field(symtab, "icmp6.type", MFF_ICMPV6_TYPE, "icmp6",
true);
expr_symtab_add_field(symtab, "icmp6.code", MFF_ICMPV6_CODE, "icmp6",
true);
expr_symtab_add_predicate(symtab, "icmp", "icmp4 || icmp6");
expr_symtab_add_field(symtab, "ip.frag", MFF_IP_FRAG, "ip", false);
expr_symtab_add_predicate(symtab, "ip.is_frag", "ip.frag[0]");
expr_symtab_add_predicate(symtab, "ip.later_frag", "ip.frag[1]");
expr_symtab_add_predicate(symtab, "ip.first_frag", "ip.is_frag && !ip.later_frag");
expr_symtab_add_predicate(symtab, "arp", "eth.type == 0x806");
expr_symtab_add_field(symtab, "arp.op", MFF_ARP_OP, "arp", false);
expr_symtab_add_field(symtab, "arp.spa", MFF_ARP_SPA, "arp", false);
expr_symtab_add_field(symtab, "arp.sha", MFF_ARP_SHA, "arp", false);
expr_symtab_add_field(symtab, "arp.tpa", MFF_ARP_TPA, "arp", false);
expr_symtab_add_field(symtab, "arp.tha", MFF_ARP_THA, "arp", false);
expr_symtab_add_predicate(symtab, "nd", "icmp6.type == {135, 136} && icmp6.code == 0");
expr_symtab_add_field(symtab, "nd.target", MFF_ND_TARGET, "nd", false);
expr_symtab_add_field(symtab, "nd.sll", MFF_ND_SLL,
"nd && icmp6.type == 135", false);
expr_symtab_add_field(symtab, "nd.tll", MFF_ND_TLL,
"nd && icmp6.type == 136", false);
expr_symtab_add_predicate(symtab, "tcp", "ip.proto == 6");
expr_symtab_add_field(symtab, "tcp.src", MFF_TCP_SRC, "tcp", false);
expr_symtab_add_field(symtab, "tcp.dst", MFF_TCP_DST, "tcp", false);
expr_symtab_add_field(symtab, "tcp.flags", MFF_TCP_FLAGS, "tcp", false);
expr_symtab_add_predicate(symtab, "udp", "ip.proto == 17");
expr_symtab_add_field(symtab, "udp.src", MFF_UDP_SRC, "udp", false);
expr_symtab_add_field(symtab, "udp.dst", MFF_UDP_DST, "udp", false);
expr_symtab_add_predicate(symtab, "sctp", "ip.proto == 132");
expr_symtab_add_field(symtab, "sctp.src", MFF_SCTP_SRC, "sctp", false);
expr_symtab_add_field(symtab, "sctp.dst", MFF_SCTP_DST, "sctp", false);
/* For negative testing. */
expr_symtab_add_field(symtab, "bad_prereq", MFF_XREG0, "xyzzy", false);
expr_symtab_add_field(symtab, "self_recurse", MFF_XREG0,
"self_recurse != 0", false);
expr_symtab_add_field(symtab, "mutual_recurse_1", MFF_XREG0,
"mutual_recurse_2 != 0", false);
expr_symtab_add_field(symtab, "mutual_recurse_2", MFF_XREG0,
"mutual_recurse_1 != 0", false);
expr_symtab_add_string(symtab, "big_string", MFF_XREG0, NULL);
}
static void
create_dhcp_opts(struct hmap *dhcp_opts)
{
hmap_init(dhcp_opts);
dhcp_opt_add(dhcp_opts, "offerip", 0, "ipv4");
dhcp_opt_add(dhcp_opts, "netmask", 1, "ipv4");
dhcp_opt_add(dhcp_opts, "router", 3, "ipv4");
dhcp_opt_add(dhcp_opts, "dns_server", 6, "ipv4");
dhcp_opt_add(dhcp_opts, "log_server", 7, "ipv4");
dhcp_opt_add(dhcp_opts, "lpr_server", 9, "ipv4");
dhcp_opt_add(dhcp_opts, "domain", 15, "str");
dhcp_opt_add(dhcp_opts, "swap_server", 16, "ipv4");
dhcp_opt_add(dhcp_opts, "policy_filter", 21, "ipv4");
dhcp_opt_add(dhcp_opts, "router_solicitation", 32, "ipv4");
dhcp_opt_add(dhcp_opts, "nis_server", 41, "ipv4");
dhcp_opt_add(dhcp_opts, "ntp_server", 42, "ipv4");
dhcp_opt_add(dhcp_opts, "server_id", 54, "ipv4");
dhcp_opt_add(dhcp_opts, "tftp_server", 66, "ipv4");
dhcp_opt_add(dhcp_opts, "classless_static_route", 121, "static_routes");
dhcp_opt_add(dhcp_opts, "ip_forward_enable", 19, "bool");
dhcp_opt_add(dhcp_opts, "router_discovery", 31, "bool");
dhcp_opt_add(dhcp_opts, "ethernet_encap", 36, "bool");
dhcp_opt_add(dhcp_opts, "default_ttl", 23, "uint8");
dhcp_opt_add(dhcp_opts, "tcp_ttl", 37, "uint8");
dhcp_opt_add(dhcp_opts, "mtu", 26, "uint16");
dhcp_opt_add(dhcp_opts, "lease_time", 51, "uint32");
}
static void
create_macros(struct shash *macros)
{
shash_init(macros);
static const char *const addrs1[] = {
"10.0.0.1", "10.0.0.2", "10.0.0.3",
};
static const char *const addrs2[] = {
"::1", "::2", "::3",
};
static const char *const addrs3[] = {
"00:00:00:00:00:01", "00:00:00:00:00:02", "00:00:00:00:00:03",
};
expr_macros_add(macros, "set1", addrs1, 3);
expr_macros_add(macros, "set2", addrs2, 3);
expr_macros_add(macros, "set3", addrs3, 3);
}
static bool
lookup_port_cb(const void *ports_, const char *port_name, unsigned int *portp)
{
const struct simap *ports = ports_;
const struct simap_node *node = simap_find(ports, port_name);
if (!node) {
return false;
}
*portp = node->data;
return true;
}
static void
test_parse_expr__(int steps)
{
struct shash symtab;
struct shash macros;
struct simap ports;
struct ds input;
create_symtab(&symtab);
create_macros(¯os);
simap_init(&ports);
simap_put(&ports, "eth0", 5);
simap_put(&ports, "eth1", 6);
simap_put(&ports, "LOCAL", ofp_to_u16(OFPP_LOCAL));
ds_init(&input);
while (!ds_get_test_line(&input, stdin)) {
struct expr *expr;
char *error;
expr = expr_parse_string(ds_cstr(&input), &symtab, ¯os, &error);
if (!error && steps > 0) {
expr = expr_annotate(expr, &symtab, &error);
}
if (!error) {
if (steps > 1) {
expr = expr_simplify(expr);
}
if (steps > 2) {
expr = expr_normalize(expr);
ovs_assert(expr_is_normalized(expr));
}
}
if (!error) {
if (steps > 3) {
struct hmap matches;
expr_to_matches(expr, lookup_port_cb, &ports, &matches);
expr_matches_print(&matches, stdout);
expr_matches_destroy(&matches);
} else {
struct ds output = DS_EMPTY_INITIALIZER;
expr_format(expr, &output);
puts(ds_cstr(&output));
ds_destroy(&output);
}
} else {
puts(error);
free(error);
}
expr_destroy(expr);
}
ds_destroy(&input);
simap_destroy(&ports);
expr_symtab_destroy(&symtab);
shash_destroy(&symtab);
expr_macros_destroy(¯os);
shash_destroy(¯os);
}
static void
test_parse_expr(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
test_parse_expr__(0);
}
static void
test_annotate_expr(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
test_parse_expr__(1);
}
static void
test_simplify_expr(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
test_parse_expr__(2);
}
static void
test_normalize_expr(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
test_parse_expr__(3);
}
static void
test_expr_to_flows(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
test_parse_expr__(4);
}
/* Evaluate an expression. */
static bool evaluate_expr(const struct expr *, unsigned int subst, int n_bits);
static bool
evaluate_andor_expr(const struct expr *expr, unsigned int subst, int n_bits,
bool short_circuit)
{
const struct expr *sub;
LIST_FOR_EACH (sub, node, &expr->andor) {
if (evaluate_expr(sub, subst, n_bits) == short_circuit) {
return short_circuit;
}
}
return !short_circuit;
}
static bool
evaluate_cmp_expr(const struct expr *expr, unsigned int subst, int n_bits)
{
int var_idx = atoi(expr->cmp.symbol->name + 1);
if (expr->cmp.symbol->name[0] == 'n') {
unsigned var_mask = (1u << n_bits) - 1;
unsigned int arg1 = (subst >> (var_idx * n_bits)) & var_mask;
unsigned int arg2 = ntohll(expr->cmp.value.integer);
unsigned int mask = ntohll(expr->cmp.mask.integer);
ovs_assert(!(mask & ~var_mask));
ovs_assert(!(arg2 & ~var_mask));
ovs_assert(!(arg2 & ~mask));
arg1 &= mask;
switch (expr->cmp.relop) {
case EXPR_R_EQ:
return arg1 == arg2;
case EXPR_R_NE:
return arg1 != arg2;
case EXPR_R_LT:
return arg1 < arg2;
case EXPR_R_LE:
return arg1 <= arg2;
case EXPR_R_GT:
return arg1 > arg2;
case EXPR_R_GE:
return arg1 >= arg2;
default:
OVS_NOT_REACHED();
}
} else if (expr->cmp.symbol->name[0] == 's') {
unsigned int arg1 = (subst >> (test_nvars * n_bits + var_idx)) & 1;
unsigned int arg2 = atoi(expr->cmp.string);
return arg1 == arg2;
} else {
OVS_NOT_REACHED();
}
}
/* Evaluates 'expr' and returns its Boolean result. 'subst' provides the value
* for the variables, which must be 'n_bits' bits each and be named "a", "b",
* "c", etc. The value of variable "a" is the least-significant 'n_bits' bits
* of 'subst', the value of "b" is the next 'n_bits' bits, and so on. */
static bool
evaluate_expr(const struct expr *expr, unsigned int subst, int n_bits)
{
switch (expr->type) {
case EXPR_T_CMP:
return evaluate_cmp_expr(expr, subst, n_bits);
case EXPR_T_AND:
return evaluate_andor_expr(expr, subst, n_bits, false);
case EXPR_T_OR:
return evaluate_andor_expr(expr, subst, n_bits, true);
case EXPR_T_BOOLEAN:
return expr->boolean;
default:
OVS_NOT_REACHED();
}
}
static void
test_evaluate_expr(struct ovs_cmdl_context *ctx)
{
int a = atoi(ctx->argv[1]);
int b = atoi(ctx->argv[2]);
int c = atoi(ctx->argv[3]);
unsigned int subst = a | (b << 3) || (c << 6);
struct shash symtab;
struct ds input;
shash_init(&symtab);
expr_symtab_add_field(&symtab, "xreg0", MFF_XREG0, NULL, false);
expr_symtab_add_field(&symtab, "xreg1", MFF_XREG1, NULL, false);
expr_symtab_add_field(&symtab, "xreg2", MFF_XREG1, NULL, false);
expr_symtab_add_subfield(&symtab, "a", NULL, "xreg0[0..2]");
expr_symtab_add_subfield(&symtab, "b", NULL, "xreg1[0..2]");
expr_symtab_add_subfield(&symtab, "c", NULL, "xreg2[0..2]");
ds_init(&input);
while (!ds_get_test_line(&input, stdin)) {
struct expr *expr;
char *error;
expr = expr_parse_string(ds_cstr(&input), &symtab, NULL, &error);
if (!error) {
expr = expr_annotate(expr, &symtab, &error);
}
if (!error) {
printf("%d\n", evaluate_expr(expr, subst, 3));
} else {
puts(error);
free(error);
}
expr_destroy(expr);
}
ds_destroy(&input);
expr_symtab_destroy(&symtab);
shash_destroy(&symtab);
}
/* Compositions.
*
* The "compositions" of a positive integer N are all of the ways that one can
* add up positive integers to sum to N. For example, the compositions of 3
* are 3, 2+1, 1+2, and 1+1+1.
*
* We use compositions to find all the ways to break up N terms of a Boolean
* expression into subexpressions. Suppose we want to generate all expressions
* with 3 terms. The compositions of 3 (ignoring 3 itself) provide the
* possibilities (x && x) || x, x || (x && x), and x || x || x. (Of course one
* can exchange && for || in each case.) One must recursively compose the
* sub-expressions whose values are 3 or greater; that is what the "tree shape"
* concept later covers.
*
* To iterate through all compositions of, e.g., 5:
*
* unsigned int state;
* int s[5];
* int n;
*
* for (n = first_composition(ARRAY_SIZE(s), &state, s); n > 0;
* n = next_composition(&state, s, n)) {
* // Do something with composition 's' with 'n' elements.
* }
*
* Algorithm from D. E. Knuth, _The Art of Computer Programming, Vol. 4A:
* Combinatorial Algorithms, Part 1_, section 7.2.1.1, answer to exercise
* 12(a).
*/
/* Begins iteration through the compositions of 'n'. Initializes 's' to the
* number of elements in the first composition of 'n' and returns that number
* of elements. The first composition in fact is always 'n' itself, so the
* return value will be 1.
*
* Initializes '*state' to some internal state information. The caller must
* maintain this state (and 's') for use by next_composition().
*
* 's' must have room for at least 'n' elements. */
static int
first_composition(int n, unsigned int *state, int s[])
{
*state = 0;
s[0] = n;
return 1;
}
/* Advances 's', with 'sn' elements, to the next composition and returns the
* number of elements in this new composition, or 0 if no compositions are
* left. 'state' is the same internal state passed to first_composition(). */
static int
next_composition(unsigned int *state, int s[], int sn)
{
int j = sn - 1;
if (++*state & 1) {
if (s[j] > 1) {
s[j]--;
s[j + 1] = 1;
j++;
} else {
j--;
s[j]++;
}
} else {
if (s[j - 1] > 1) {
s[j - 1]--;
s[j + 1] = s[j];
s[j] = 1;
j++;
} else {
j--;
s[j] = s[j + 1];
s[j - 1]++;
if (!j) {
return 0;
}
}
}
return j + 1;
}
static void
test_composition(struct ovs_cmdl_context *ctx)
{
int n = atoi(ctx->argv[1]);
unsigned int state;
int s[50];
for (int sn = first_composition(n, &state, s); sn;
sn = next_composition(&state, s, sn)) {
for (int i = 0; i < sn; i++) {
printf("%d%c", s[i], i == sn - 1 ? '\n' : ' ');
}
}
}
/* Tree shapes.
*
* This code generates all possible Boolean expressions with a specified number
* of terms N (equivalent to the number of external nodes in a tree).
*
* See test_tree_shape() for a simple example. */
/* An array of these structures describes the shape of a tree.
*
* A single element of struct tree_shape describes a single node in the tree.
* The node has 'sn' direct children. From left to right, for i in 0...sn-1,
* s[i] is 1 if the child is a leaf node, otherwise the child is a subtree and
* s[i] is the number of leaf nodes within that subtree. In the latter case,
* the subtree is described by another struct tree_shape within the enclosing
* array. The tree_shapes are ordered in the array in in-order.
*/
struct tree_shape {
unsigned int state;
int s[50];
int sn;
};
static int
init_tree_shape__(struct tree_shape ts[], int n)
{
if (n <= 2) {
return 0;
}
int n_tses = 1;
/* Skip the first composition intentionally. */
ts->sn = first_composition(n, &ts->state, ts->s);
ts->sn = next_composition(&ts->state, ts->s, ts->sn);
for (int i = 0; i < ts->sn; i++) {
n_tses += init_tree_shape__(&ts[n_tses], ts->s[i]);
}
return n_tses;
}
/* Initializes 'ts[]' as the first in the set of all of possible shapes of
* trees with 'n' leaves. Returns the number of "struct tree_shape"s in the
* first tree shape. */
static int
init_tree_shape(struct tree_shape ts[], int n)
{
switch (n) {
case 1:
ts->sn = 1;
ts->s[0] = 1;
return 1;
case 2:
ts->sn = 2;
ts->s[0] = 1;
ts->s[1] = 1;
return 1;
default:
return init_tree_shape__(ts, n);
}
}
/* Advances 'ts', which currently has 'n_tses' elements, to the next possible
* tree shape with the number of leaves passed to init_tree_shape(). Returns
* the number of "struct tree_shape"s in the next shape, or 0 if all tree
* shapes have been visited. */
static int
next_tree_shape(struct tree_shape ts[], int n_tses)
{
if (n_tses == 1 && ts->sn == 2 && ts->s[0] == 1 && ts->s[1] == 1) {
return 0;
}
while (n_tses > 0) {
struct tree_shape *p = &ts[n_tses - 1];
p->sn = p->sn > 1 ? next_composition(&p->state, p->s, p->sn) : 0;
if (p->sn) {
for (int i = 0; i < p->sn; i++) {
n_tses += init_tree_shape__(&ts[n_tses], p->s[i]);
}
break;
}
n_tses--;
}
return n_tses;
}
static void
print_tree_shape(const struct tree_shape ts[], int n_tses)
{
for (int i = 0; i < n_tses; i++) {
if (i) {
printf(", ");
}
for (int j = 0; j < ts[i].sn; j++) {
int k = ts[i].s[j];
if (k > 9) {
printf("(%d)", k);
} else {
printf("%d", k);
}
}
}
}
static void
test_tree_shape(struct ovs_cmdl_context *ctx)
{
int n = atoi(ctx->argv[1]);
struct tree_shape ts[50];
int n_tses;
for (n_tses = init_tree_shape(ts, n); n_tses;
n_tses = next_tree_shape(ts, n_tses)) {
print_tree_shape(ts, n_tses);
putchar('\n');
}
}
/* Iteration through all possible terminal expressions (e.g. EXPR_T_CMP and
* EXPR_T_BOOLEAN expressions).
*
* Given a tree shape, this allows the code to try all possible ways to plug in
* terms.
*
* Example use:
*
* struct expr terminal;
* const struct expr_symbol *vars = ...;
* int n_vars = ...;
* int n_bits = ...;
*
* init_terminal(&terminal, vars[0]);
* do {
* // Something with 'terminal'.
* } while (next_terminal(&terminal, vars, n_vars, n_bits));
*/
/* Sets 'expr' to the first possible terminal expression. 'var' should be the
* first variable in the ones to be tested. */
static void
init_terminal(struct expr *expr, int phase,
const struct expr_symbol *nvars[], int n_nvars,
const struct expr_symbol *svars[], int n_svars)
{
if (phase < 1 && n_nvars) {
expr->type = EXPR_T_CMP;
expr->cmp.symbol = nvars[0];
expr->cmp.relop = rightmost_1bit_idx(test_relops);
memset(&expr->cmp.value, 0, sizeof expr->cmp.value);
memset(&expr->cmp.mask, 0, sizeof expr->cmp.mask);
expr->cmp.value.integer = htonll(0);
expr->cmp.mask.integer = htonll(1);
return;
}
if (phase < 2 && n_svars) {
expr->type = EXPR_T_CMP;
expr->cmp.symbol = svars[0];
expr->cmp.relop = EXPR_R_EQ;
expr->cmp.string = xstrdup("0");
return;
}
expr->type = EXPR_T_BOOLEAN;
expr->boolean = false;
}
/* Returns 'x' with the rightmost contiguous string of 1s changed to 0s,
* e.g. 01011100 => 01000000. See H. S. Warren, Jr., _Hacker's Delight_, 2nd
* ed., section 2-1. */
static unsigned int
turn_off_rightmost_1s(unsigned int x)
{
return ((x & -x) + x) & x;
}
static const struct expr_symbol *
next_var(const struct expr_symbol *symbol,
const struct expr_symbol *vars[], int n_vars)
{
for (int i = 0; i < n_vars; i++) {
if (symbol == vars[i]) {
return i + 1 >= n_vars ? NULL : vars[i + 1];
}
}
OVS_NOT_REACHED();
}
static enum expr_relop
next_relop(enum expr_relop relop)
{
unsigned int remaining_relops = test_relops & ~((1u << (relop + 1)) - 1);
return (remaining_relops
? rightmost_1bit_idx(remaining_relops)
: rightmost_1bit_idx(test_relops));
}
/* Advances 'expr' to the next possible terminal expression within the 'n_vars'
* variables of 'n_bits' bits each in 'vars[]'. */
static bool
next_terminal(struct expr *expr,
const struct expr_symbol *nvars[], int n_nvars, int n_bits,
const struct expr_symbol *svars[], int n_svars)
{
if (expr->type == EXPR_T_BOOLEAN) {
if (expr->boolean) {
return false;
} else {
expr->boolean = true;
return true;
}
}
if (!expr->cmp.symbol->width) {
int next_value = atoi(expr->cmp.string) + 1;
free(expr->cmp.string);
if (next_value > 1) {
expr->cmp.symbol = next_var(expr->cmp.symbol, svars, n_svars);
if (!expr->cmp.symbol) {
init_terminal(expr, 2, nvars, n_nvars, svars, n_svars);
return true;
}
next_value = 0;
}
expr->cmp.string = xasprintf("%d", next_value);
return true;
}
unsigned int next;
next = (ntohll(expr->cmp.value.integer)
+ (ntohll(expr->cmp.mask.integer) << n_bits));
for (;;) {
next++;
unsigned m = next >> n_bits;
unsigned v = next & ((1u << n_bits) - 1);
if (next >= (1u << (2 * n_bits))) {
enum expr_relop old_relop = expr->cmp.relop;
expr->cmp.relop = next_relop(old_relop);
if (expr->cmp.relop <= old_relop) {
expr->cmp.symbol = next_var(expr->cmp.symbol, nvars, n_nvars);
if (!expr->cmp.symbol) {
init_terminal(expr, 1, nvars, n_nvars, svars, n_svars);
return true;
}
}
next = 0;
} else if (m == 0) {
/* Skip: empty mask is pathological. */
} else if (v & ~m) {
/* Skip: 1-bits in value correspond to 0-bits in mask. */
} else if (turn_off_rightmost_1s(m)
&& (expr->cmp.relop != EXPR_R_EQ &&
expr->cmp.relop != EXPR_R_NE)) {
/* Skip: can't have discontiguous mask for > >= < <=. */
} else {
expr->cmp.value.integer = htonll(v);
expr->cmp.mask.integer = htonll(m);
return true;
}
}
}
static struct expr *
make_terminal(struct expr ***terminalp)
{
struct expr *e = expr_create_boolean(true);
**terminalp = e;
(*terminalp)++;
return e;
}
static struct expr *
build_simple_tree(enum expr_type type, int n, struct expr ***terminalp)
{
if (n == 2) {
struct expr *e = expr_create_andor(type);
for (int i = 0; i < 2; i++) {
struct expr *sub = make_terminal(terminalp);
ovs_list_push_back(&e->andor, &sub->node);
}
return e;
} else if (n == 1) {
return make_terminal(terminalp);
} else {
OVS_NOT_REACHED();
}
}
static struct expr *
build_tree_shape(enum expr_type type, const struct tree_shape **tsp,
struct expr ***terminalp)
{
const struct tree_shape *ts = *tsp;
(*tsp)++;
struct expr *e = expr_create_andor(type);
enum expr_type t = type == EXPR_T_AND ? EXPR_T_OR : EXPR_T_AND;
for (int i = 0; i < ts->sn; i++) {
struct expr *sub = (ts->s[i] > 2
? build_tree_shape(t, tsp, terminalp)
: build_simple_tree(t, ts->s[i], terminalp));
ovs_list_push_back(&e->andor, &sub->node);
}
return e;
}
struct test_rule {
struct cls_rule cr;
};
static void
free_rule(struct test_rule *test_rule)
{
cls_rule_destroy(&test_rule->cr);
free(test_rule);
}
static int
test_tree_shape_exhaustively(struct expr *expr, struct shash *symtab,
struct expr *terminals[], int n_terminals,
const struct expr_symbol *nvars[], int n_nvars,
int n_bits,
const struct expr_symbol *svars[], int n_svars)
{
struct simap string_map = SIMAP_INITIALIZER(&string_map);
simap_put(&string_map, "0", 0);
simap_put(&string_map, "1", 1);
int n_tested = 0;
const unsigned int var_mask = (1u << n_bits) - 1;
for (int i = 0; i < n_terminals; i++) {
init_terminal(terminals[i], 0, nvars, n_nvars, svars, n_svars);
}
struct ds s = DS_EMPTY_INITIALIZER;
struct flow f;
memset(&f, 0, sizeof f);
for (;;) {
for (int i = n_terminals - 1; ; i--) {
if (!i) {
ds_destroy(&s);
simap_destroy(&string_map);
return n_tested;
}
if (next_terminal(terminals[i], nvars, n_nvars, n_bits,
svars, n_svars)) {
break;
}
init_terminal(terminals[i], 0, nvars, n_nvars, svars, n_svars);
}
ovs_assert(expr_honors_invariants(expr));
n_tested++;
struct expr *modified;
if (operation == OP_CONVERT) {
ds_clear(&s);
expr_format(expr, &s);
char *error;
modified = expr_parse_string(ds_cstr(&s), symtab, NULL, &error);
if (error) {
fprintf(stderr, "%s fails to parse (%s)\n",
ds_cstr(&s), error);
exit(EXIT_FAILURE);
}
} else if (operation >= OP_SIMPLIFY) {
modified = expr_simplify(expr_clone(expr));
ovs_assert(expr_honors_invariants(modified));
if (operation >= OP_NORMALIZE) {
modified = expr_normalize(modified);
ovs_assert(expr_is_normalized(modified));
}
}
struct hmap matches;
struct classifier cls;
if (operation >= OP_FLOW) {
struct expr_match *m;