mirror of
https://github.com/openvswitch/ovs
synced 2025-08-29 05:18:13 +00:00
75a7504356
There are a few loose ends here. First, learning actions cause too much
flow revalidation. Upcoming commits will fix that problem. The following
additional issues have not yet been addressed:
* Resource limits: nothing yet limits the maximum number of flows that
can be learned. It is possible to exhaust all system memory.
* Age reporting: there is no way to find out how soon a learned table
entry is due to be evicted.
To try this action out, here's a recipe for a very simple-minded MAC
learning switch. It uses a 10-second MAC expiration time to make it easier
to see what's going on:
ovs-vsctl del-controller br0
ovs-ofctl del-flows br0
ovs-ofctl add-flow br0 "table=0 actions=learn(table=1, hard_timeout=10, \
NXM_OF_VLAN_TCI[0..11], NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[], \
output:NXM_OF_IN_PORT[]), resubmit(,1)"
ovs-ofctl add-flow br0 "table=1 priority=0 actions=flood"
You can then dump the MAC learning table with:
ovs-ofctl dump-flows br0 table=1
208 lines
7.0 KiB
C
208 lines
7.0 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef UTIL_H
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#define UTIL_H 1
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "compiler.h"
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#ifndef va_copy
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#ifdef __va_copy
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#define va_copy __va_copy
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#else
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#define va_copy(dst, src) ((dst) = (src))
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#endif
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#endif
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#ifdef __CHECKER__
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#define BUILD_ASSERT(EXPR) ((void) 0)
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#define BUILD_ASSERT_DECL(EXPR) extern int (*build_assert(void))[1]
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#elif !defined(__cplusplus)
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/* Build-time assertion building block. */
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#define BUILD_ASSERT__(EXPR) \
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sizeof(struct { unsigned int build_assert_failed : (EXPR) ? 1 : -1; })
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/* Build-time assertion for use in a statement context. */
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#define BUILD_ASSERT(EXPR) (void) BUILD_ASSERT__(EXPR)
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/* Build-time assertion for use in a declaration context. */
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#define BUILD_ASSERT_DECL(EXPR) \
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extern int (*build_assert(void))[BUILD_ASSERT__(EXPR)]
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#else /* __cplusplus */
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#include <boost/static_assert.hpp>
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#define BUILD_ASSERT BOOST_STATIC_ASSERT
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#define BUILD_ASSERT_DECL BOOST_STATIC_ASSERT
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#endif /* __cplusplus */
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extern const char *program_name;
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/* Returns the number of elements in ARRAY. */
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#define ARRAY_SIZE(ARRAY) (sizeof ARRAY / sizeof *ARRAY)
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/* Returns X / Y, rounding up. X must be nonnegative to round correctly. */
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#define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y))
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/* Returns X rounded up to the nearest multiple of Y. */
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#define ROUND_UP(X, Y) (DIV_ROUND_UP(X, Y) * (Y))
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/* Returns X rounded down to the nearest multiple of Y. */
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#define ROUND_DOWN(X, Y) ((X) / (Y) * (Y))
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/* Returns true if X is a power of 2, otherwise false. */
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#define IS_POW2(X) ((X) && !((X) & ((X) - 1)))
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#ifndef MIN
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#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
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#endif
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#ifndef MAX
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#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
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#endif
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#define NOT_REACHED() abort()
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/* Expands to a string that looks like "<file>:<line>", e.g. "tmp.c:10".
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*
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* See http://c-faq.com/ansi/stringize.html for an explanation of STRINGIZE and
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* STRINGIZE2. */
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#define SOURCE_LOCATOR __FILE__ ":" STRINGIZE(__LINE__)
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#define STRINGIZE(ARG) STRINGIZE2(ARG)
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#define STRINGIZE2(ARG) #ARG
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/* Given a pointer-typed lvalue OBJECT, expands to a pointer type that may be
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* assigned to OBJECT. */
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#ifdef __GNUC__
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#define OVS_TYPEOF(OBJECT) typeof(OBJECT)
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#else
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#define OVS_TYPEOF(OBJECT) void *
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#endif
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/* Given OBJECT of type pointer-to-structure, expands to the offset of MEMBER
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* within an instance of the structure.
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*
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* The GCC-specific version avoids the technicality of undefined behavior if
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* OBJECT is null, invalid, or not yet initialized. This makes some static
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* checkers (like Coverity) happier. But the non-GCC version does not actually
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* dereference any pointer, so it would be surprising for it to cause any
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* problems in practice.
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*/
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#ifdef __GNUC__
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#define OBJECT_OFFSETOF(OBJECT, MEMBER) offsetof(typeof(*(OBJECT)), MEMBER)
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#else
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#define OBJECT_OFFSETOF(OBJECT, MEMBER) \
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((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))
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#endif
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/* Given POINTER, the address of the given MEMBER in a STRUCT object, returns
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the STRUCT object. */
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#define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
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((STRUCT *) (void *) ((char *) (POINTER) - offsetof (STRUCT, MEMBER)))
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/* Given POINTER, the address of the given MEMBER within an object of the type
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* that that OBJECT points to, returns OBJECT as an assignment-compatible
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* pointer type (either the correct pointer type or "void *"). OBJECT must be
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* an lvalue.
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*
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* This is the same as CONTAINER_OF except that it infers the structure type
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* from the type of '*OBJECT'. */
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#define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
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((OVS_TYPEOF(OBJECT)) (void *) \
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((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER)))
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/* Given POINTER, the address of the given MEMBER within an object of the type
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* that that OBJECT points to, assigns the address of the outer object to
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* OBJECT, which must be an lvalue.
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*
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* Evaluates to 1. */
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#define ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER) \
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((OBJECT) = OBJECT_CONTAINING(POINTER, OBJECT, MEMBER), 1)
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#ifdef __cplusplus
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extern "C" {
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#endif
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void set_program_name__(const char *name, const char *date, const char *time);
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#define set_program_name(name) \
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set_program_name__(name, __DATE__, __TIME__)
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const char *get_program_version(void);
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void ovs_print_version(uint8_t min_ofp, uint8_t max_ofp);
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void out_of_memory(void) NO_RETURN;
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void *xmalloc(size_t) MALLOC_LIKE;
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void *xcalloc(size_t, size_t) MALLOC_LIKE;
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void *xzalloc(size_t) MALLOC_LIKE;
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void *xrealloc(void *, size_t);
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void *xmemdup(const void *, size_t) MALLOC_LIKE;
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char *xmemdup0(const char *, size_t) MALLOC_LIKE;
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char *xstrdup(const char *) MALLOC_LIKE;
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char *xasprintf(const char *format, ...) PRINTF_FORMAT(1, 2) MALLOC_LIKE;
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char *xvasprintf(const char *format, va_list) PRINTF_FORMAT(1, 0) MALLOC_LIKE;
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void *x2nrealloc(void *p, size_t *n, size_t s);
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void ovs_strlcpy(char *dst, const char *src, size_t size);
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void ovs_strzcpy(char *dst, const char *src, size_t size);
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void ovs_abort(int err_no, const char *format, ...)
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PRINTF_FORMAT(2, 3) NO_RETURN;
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void ovs_fatal(int err_no, const char *format, ...)
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PRINTF_FORMAT(2, 3) NO_RETURN;
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void ovs_fatal_valist(int err_no, const char *format, va_list)
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PRINTF_FORMAT(2, 0) NO_RETURN;
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void ovs_error(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3);
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void ovs_error_valist(int err_no, const char *format, va_list)
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PRINTF_FORMAT(2, 0);
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const char *ovs_retval_to_string(int);
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void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii);
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bool str_to_int(const char *, int base, int *);
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bool str_to_long(const char *, int base, long *);
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bool str_to_llong(const char *, int base, long long *);
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bool str_to_uint(const char *, int base, unsigned int *);
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bool str_to_ulong(const char *, int base, unsigned long *);
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bool str_to_ullong(const char *, int base, unsigned long long *);
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bool str_to_double(const char *, double *);
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int hexit_value(int c);
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unsigned int hexits_value(const char *s, size_t n, bool *ok);
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const char *english_list_delimiter(size_t index, size_t total);
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char *get_cwd(void);
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char *dir_name(const char *file_name);
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char *base_name(const char *file_name);
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char *abs_file_name(const char *dir, const char *file_name);
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void ignore(bool x OVS_UNUSED);
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int log_2_floor(uint32_t);
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int ctz(uint32_t);
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bool is_all_zeros(const uint8_t *, size_t);
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bool is_all_ones(const uint8_t *, size_t);
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#ifdef __cplusplus
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}
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#endif
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#endif /* util.h */
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