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-rw-r--r--src/vppinfra/smp_fifo.h313
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diff --git a/src/vppinfra/smp_fifo.h b/src/vppinfra/smp_fifo.h
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-/*
- * Copyright (c) 2015 Cisco and/or its affiliates.
- * 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.
- */
-/*
- Copyright (c) 2012 Eliot Dresselhaus
-
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
-
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-*/
-
-#ifndef included_clib_smp_vec_h
-#define included_clib_smp_vec_h
-
-#include <vppinfra/smp.h>
-
-#define foreach_clib_smp_fifo_data_state \
- _ (free) \
- _ (write_alloc) \
- _ (write_done) \
- _ (read_fetch)
-
-typedef enum
-{
-#define _(f) CLIB_SMP_FIFO_DATA_STATE_##f,
- foreach_clib_smp_fifo_data_state
-#undef _
- CLIB_SMP_FIFO_N_DATA_STATE,
-} clib_smp_fifo_data_state_t;
-
-/* Footer at end of each data element. */
-typedef struct
-{
- /* Magic number marking valid footer plus state encoded in low bits. */
- u32 magic_state;
-} clib_smp_fifo_data_footer_t;
-
-#define CLIB_SMP_DATA_FOOTER_MAGIC 0xfafbfcf0
-
-always_inline clib_smp_fifo_data_state_t
-clib_smp_fifo_data_footer_get_state (clib_smp_fifo_data_footer_t * f)
-{
- u32 s = f->magic_state - CLIB_SMP_DATA_FOOTER_MAGIC;
-
- /* Check that magic number plus state is still valid. */
- if (s >= CLIB_SMP_FIFO_N_DATA_STATE)
- os_panic ();
-
- return s;
-}
-
-always_inline void
-clib_smp_fifo_data_footer_set_state (clib_smp_fifo_data_footer_t * f,
- clib_smp_fifo_data_state_t s)
-{
- f->magic_state = CLIB_SMP_DATA_FOOTER_MAGIC + s;
-}
-
-typedef struct
-{
- /* Read/write indices each on their own cache line.
- Atomic incremented for each read/write. */
- u32 read_index, write_index;
-
- /* Power of 2 number of elements in fifo less one. */
- u32 max_n_elts_less_one;
-
- /* Log2 of above. */
- u32 log2_max_n_elts;
-
- /* Cache aligned data. */
- void *data;
-} clib_smp_fifo_t;
-
-/* External functions. */
-clib_smp_fifo_t *clib_smp_fifo_init (uword max_n_elts, uword n_bytes_per_elt);
-
-/* Elements are always cache-line sized; this is to avoid smp cache thrashing. */
-always_inline uword
-clib_smp_fifo_round_elt_bytes (uword n_bytes_per_elt)
-{
- return round_pow2 (n_bytes_per_elt, CLIB_CACHE_LINE_BYTES);
-}
-
-always_inline uword
-clib_smp_fifo_n_elts (clib_smp_fifo_t * f)
-{
- uword n = f->write_index - f->read_index;
- ASSERT (n <= f->max_n_elts_less_one + 1);
- return n;
-}
-
-always_inline clib_smp_fifo_data_footer_t *
-clib_smp_fifo_get_data_footer (void *d, uword n_bytes_per_elt)
-{
- clib_smp_fifo_data_footer_t *f;
- f = d + clib_smp_fifo_round_elt_bytes (n_bytes_per_elt) - sizeof (f[0]);
- return f;
-}
-
-always_inline void *
-clib_smp_fifo_elt_at_index (clib_smp_fifo_t * f, uword n_bytes_per_elt,
- uword i)
-{
- uword n_bytes_per_elt_cache_aligned;
-
- ASSERT (i <= f->max_n_elts_less_one);
-
- n_bytes_per_elt_cache_aligned =
- clib_smp_fifo_round_elt_bytes (n_bytes_per_elt);
-
- return f->data + i * n_bytes_per_elt_cache_aligned;
-}
-
-always_inline void *
-clib_smp_fifo_write_alloc (clib_smp_fifo_t * f, uword n_bytes_per_elt)
-{
- void *d;
- clib_smp_fifo_data_footer_t *t;
- clib_smp_fifo_data_state_t s;
- u32 wi0, wi1;
-
- wi0 = f->write_index;
-
- /* Fifo full? */
- if (wi0 - f->read_index > f->max_n_elts_less_one)
- return 0;
-
- while (1)
- {
- wi1 = wi0 + 1;
-
- d =
- clib_smp_fifo_elt_at_index (f, n_bytes_per_elt,
- wi0 & f->max_n_elts_less_one);
- t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
-
- s = clib_smp_fifo_data_footer_get_state (t);
- if (s != CLIB_SMP_FIFO_DATA_STATE_free)
- {
- d = 0;
- break;
- }
-
- wi1 = clib_smp_compare_and_swap (&f->write_index, wi1, wi0);
-
- if (wi1 == wi0)
- {
- clib_smp_fifo_data_footer_set_state (t,
- CLIB_SMP_FIFO_DATA_STATE_write_alloc);
- break;
- }
-
- /* Other cpu wrote write index first: try again. */
- wi0 = wi1;
- }
-
- return d;
-}
-
-always_inline void
-clib_smp_fifo_write_done (clib_smp_fifo_t * f, void *d, uword n_bytes_per_elt)
-{
- clib_smp_fifo_data_footer_t *t;
-
- /* Flush out pending writes before we change state to write_done.
- This will hold off readers until data is flushed. */
- CLIB_MEMORY_BARRIER ();
-
- t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
-
- ASSERT (clib_smp_fifo_data_footer_get_state (t) ==
- CLIB_SMP_FIFO_DATA_STATE_write_alloc);
- clib_smp_fifo_data_footer_set_state (t,
- CLIB_SMP_FIFO_DATA_STATE_write_done);
-}
-
-always_inline void *
-clib_smp_fifo_read_fetch (clib_smp_fifo_t * f, uword n_bytes_per_elt)
-{
- void *d;
- clib_smp_fifo_data_footer_t *t;
- clib_smp_fifo_data_state_t s;
- u32 ri0, ri1;
-
- ri0 = f->read_index;
-
- /* Fifo empty? */
- if (f->write_index - ri0 == 0)
- return 0;
-
- while (1)
- {
- ri1 = ri0 + 1;
-
- d =
- clib_smp_fifo_elt_at_index (f, n_bytes_per_elt,
- ri0 & f->max_n_elts_less_one);
- t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
-
- s = clib_smp_fifo_data_footer_get_state (t);
- if (s != CLIB_SMP_FIFO_DATA_STATE_write_done)
- {
- d = 0;
- break;
- }
-
- ri1 = clib_smp_compare_and_swap (&f->read_index, ri1, ri0);
- if (ri1 == ri0)
- {
- clib_smp_fifo_data_footer_set_state (t,
- CLIB_SMP_FIFO_DATA_STATE_read_fetch);
- break;
- }
-
- ri0 = ri1;
- }
-
- return d;
-}
-
-always_inline void
-clib_smp_fifo_read_done (clib_smp_fifo_t * f, void *d, uword n_bytes_per_elt)
-{
- clib_smp_fifo_data_footer_t *t;
-
- t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
-
- ASSERT (clib_smp_fifo_data_footer_get_state (t) ==
- CLIB_SMP_FIFO_DATA_STATE_read_fetch);
- clib_smp_fifo_data_footer_set_state (t, CLIB_SMP_FIFO_DATA_STATE_free);
-}
-
-always_inline void
-clib_smp_fifo_memcpy (uword * dst, uword * src, uword n_bytes)
-{
- word n_bytes_left = n_bytes;
-
- while (n_bytes_left >= 4 * sizeof (uword))
- {
- dst[0] = src[0];
- dst[1] = src[1];
- dst[2] = src[2];
- dst[3] = src[3];
- dst += 4;
- src += 4;
- n_bytes_left -= 4 * sizeof (dst[0]);
- }
-
- while (n_bytes_left > 0)
- {
- dst[0] = src[0];
- dst += 1;
- src += 1;
- n_bytes_left -= 1 * sizeof (dst[0]);
- }
-}
-
-always_inline void
-clib_smp_fifo_write_inline (clib_smp_fifo_t * f, void *elt_to_write,
- uword n_bytes_per_elt)
-{
- uword *dst;
- dst = clib_smp_fifo_write_alloc (f, n_bytes_per_elt);
- clib_smp_fifo_memcpy (dst, elt_to_write, n_bytes_per_elt);
- clib_smp_fifo_write_done (f, dst, n_bytes_per_elt);
-}
-
-always_inline void
-clib_smp_fifo_read_inline (clib_smp_fifo_t * f, void *elt_to_read,
- uword n_bytes_per_elt)
-{
- uword *src;
- src = clib_smp_fifo_read_fetch (f, n_bytes_per_elt);
- clib_smp_fifo_memcpy (elt_to_read, src, n_bytes_per_elt);
- clib_smp_fifo_read_done (f, src, n_bytes_per_elt);
-}
-
-#endif /* included_clib_smp_vec_h */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */