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-rw-r--r--src/svm/fifo_segment.c639
1 files changed, 639 insertions, 0 deletions
diff --git a/src/svm/fifo_segment.c b/src/svm/fifo_segment.c
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+++ b/src/svm/fifo_segment.c
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+/*
+ * Copyright (c) 2016-2019 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.
+ */
+
+#include <svm/fifo_segment.h>
+
+/**
+ * Initialize fifo segment shared header
+ */
+int
+fifo_segment_init (fifo_segment_t * fs)
+{
+ fifo_segment_header_t *fsh;
+ ssvm_shared_header_t *sh;
+ void *oldheap;
+
+ sh = fs->ssvm.sh;
+ oldheap = ssvm_push_heap (sh);
+
+ fsh = clib_mem_alloc (sizeof (*fsh));
+ clib_memset (fsh, 0, sizeof (*fsh));
+ fs->h = sh->opaque[0] = fsh;
+
+ ssvm_pop_heap (oldheap);
+
+ sh->ready = 1;
+ return (0);
+}
+
+/**
+ * Create a fifo segment in process-private memory
+ */
+static int
+fifo_segment_create_process_private (fifo_segment_main_t * sm,
+ fifo_segment_create_args_t * a)
+{
+ u32 pagesize = clib_mem_get_page_size ();
+ ssvm_shared_header_t *sh;
+ fifo_segment_t *s;
+ u32 rnd_size = 0;
+ u8 *heap;
+
+ pool_get (sm->segments, s);
+ clib_memset (s, 0, sizeof (*s));
+
+ rnd_size = (a->segment_size + (pagesize - 1)) & ~pagesize;
+
+#if USE_DLMALLOC == 0
+ heap = mheap_alloc (0, rnd_size);
+ if (heap == 0)
+ {
+ clib_unix_warning ("mheap alloc");
+ pool_put (sm->segments, s);
+ return -1;
+ }
+ {
+ mheap_t *heap_header;
+ heap_header = mheap_header (heap);
+ heap_header->flags |= MHEAP_FLAG_THREAD_SAFE;
+ }
+#else
+ heap = create_mspace (rnd_size, 1 /* locked */ );
+#endif
+
+ s->ssvm.ssvm_size = rnd_size;
+ s->ssvm.i_am_master = 1;
+ s->ssvm.my_pid = getpid ();
+ s->ssvm.name = format (0, "%s%c", a->segment_name, 0);
+ s->ssvm.requested_va = ~0;
+
+ /* Allocate a [sic] shared memory header, in process memory... */
+ sh = clib_mem_alloc_aligned (sizeof (*sh), CLIB_CACHE_LINE_BYTES);
+ s->ssvm.sh = sh;
+
+ clib_memset (sh, 0, sizeof (*sh));
+ sh->heap = heap;
+
+ fifo_segment_init (s);
+ vec_add1 (a->new_segment_indices, s - sm->segments);
+
+ return (0);
+}
+
+/**
+ * Create a fifo segment and initialize as master
+ */
+int
+fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
+{
+ fifo_segment_t *s;
+ int rv;
+
+ if (a->segment_type == SSVM_SEGMENT_PRIVATE)
+ return fifo_segment_create_process_private (sm, a);
+
+ /* Allocate a fresh segment */
+ pool_get (sm->segments, s);
+ clib_memset (s, 0, sizeof (*s));
+
+ s->ssvm.ssvm_size = a->segment_size;
+ s->ssvm.i_am_master = 1;
+ s->ssvm.my_pid = getpid ();
+ s->ssvm.name = format (0, "%s%c", a->segment_name, 0);
+ s->ssvm.requested_va = sm->next_baseva;
+
+ if ((rv = ssvm_master_init (&s->ssvm, a->segment_type)))
+ {
+ pool_put (sm->segments, s);
+ return (rv);
+ }
+
+ /* Note: requested_va updated due to seg base addr randomization */
+ sm->next_baseva = s->ssvm.sh->ssvm_va + a->segment_size;
+
+ fifo_segment_init (s);
+ vec_add1 (a->new_segment_indices, s - sm->segments);
+ return (0);
+}
+
+/**
+ * Attach as slave to a fifo segment
+ */
+int
+fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
+{
+ fifo_segment_t *s;
+ int rv;
+
+ pool_get_zero (sm->segments, s);
+
+ s->ssvm.ssvm_size = a->segment_size;
+ s->ssvm.my_pid = getpid ();
+ s->ssvm.name = format (0, "%s%c", a->segment_name, 0);
+ s->ssvm.requested_va = sm->next_baseva;
+ if (a->segment_type == SSVM_SEGMENT_MEMFD)
+ s->ssvm.fd = a->memfd_fd;
+ else
+ s->ssvm.attach_timeout = sm->timeout_in_seconds;
+
+ if ((rv = ssvm_slave_init (&s->ssvm, a->segment_type)))
+ {
+ _vec_len (s) = vec_len (s) - 1;
+ return (rv);
+ }
+
+ /* Fish the segment header */
+ s->h = s->ssvm.sh->opaque[0];
+
+ vec_add1 (a->new_segment_indices, s - sm->segments);
+ return (0);
+}
+
+void
+fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
+{
+ ssvm_delete (&s->ssvm);
+ clib_memset (s, 0xfe, sizeof (*s));
+ pool_put (sm->segments, s);
+}
+
+u32
+fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
+{
+ return s - sm->segments;
+}
+
+void *
+svm_fifo_segment_heap (fifo_segment_t * seg)
+{
+ return seg->ssvm.sh->heap;
+}
+
+fifo_segment_t *
+fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
+{
+ return pool_elt_at_index (sm->segments, segment_index);
+}
+
+void
+fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
+{
+ if (ssvm_type (&seg->ssvm) == SSVM_SEGMENT_PRIVATE)
+ {
+#if USE_DLMALLOC == 0
+ mheap_t *heap_header;
+
+ *address = pointer_to_uword (seg->ssvm.sh->heap);
+ heap_header = mheap_header (seg->ssvm.sh->heap);
+ *size = heap_header->max_size;
+#else
+ mspace_get_address_and_size (seg->ssvm.sh->heap, address, size);
+#endif
+ }
+ else
+ {
+ *address = (char *) seg->ssvm.sh->ssvm_va;
+ *size = seg->ssvm.ssvm_size;
+ }
+}
+
+void
+fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
+ u32 timeout_in_seconds)
+{
+ sm->next_baseva = baseva;
+ sm->timeout_in_seconds = timeout_in_seconds;
+}
+
+static void
+fifo_init_for_segment (fifo_segment_header_t * fsh, svm_fifo_t * f,
+ u32 size, u32 fl_index)
+{
+ f->freelist_index = fl_index;
+ f->default_chunk.start_byte = 0;
+ f->default_chunk.length = size;
+ f->default_chunk.next = f->start_chunk = f->end_chunk = &f->default_chunk;
+ f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = f->start_chunk;
+ f->next = fsh->free_fifos[fl_index];
+ fsh->free_fifos[fl_index] = f;
+}
+
+static inline int
+fs_free_list_for_size (u32 size)
+{
+ return max_log2 (size) - max_log2 (FIFO_SEGMENT_MIN_FIFO_SIZE);
+}
+
+static inline int
+fs_fifo_size_is_valid (u32 size)
+{
+ /*
+ * 4K minimum. It's not likely that anything good will happen
+ * with a smaller FIFO.
+ */
+ return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
+ && size <= FIFO_SEGMENT_MAX_FIFO_SIZE;
+}
+
+static void
+allocate_new_fifo_batch (fifo_segment_header_t * fsh,
+ u32 data_size_in_bytes, int chunk_size)
+{
+ u32 size, rounded_data_size;
+ int i, fl_index;
+ u8 *fifos_mem;
+ svm_fifo_t *f;
+
+ rounded_data_size = (1 << (max_log2 (data_size_in_bytes)));
+ fl_index = fs_free_list_for_size (data_size_in_bytes);
+
+ /* Calculate space requirement $$$ round-up data_size_in_bytes */
+ size = (sizeof (*f) + rounded_data_size) * chunk_size;
+
+ /* Allocate fifo space. May fail. */
+ fifos_mem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
+ 0 /* align_offset */ ,
+ 0 /* os_out_of_memory */ );
+
+ /* Out of space.. */
+ if (fifos_mem == 0)
+ return;
+
+ /* Carve fifo space */
+ for (i = 0; i < chunk_size; i++)
+ {
+ f = (svm_fifo_t *) fifos_mem;
+ fifo_init_for_segment (fsh, f, rounded_data_size, fl_index);
+ fifos_mem += sizeof (*f) + rounded_data_size;
+ }
+}
+
+/**
+ * Allocate fifo in fifo segment
+ */
+svm_fifo_t *
+fifo_segment_alloc_fifo (fifo_segment_t * fs, u32 data_bytes,
+ fifo_segment_ftype_t ftype)
+{
+ fifo_segment_header_t *fsh;
+ ssvm_shared_header_t *sh;
+ svm_fifo_t *f = 0;
+ void *oldheap;
+ int fl_index;
+
+ if (!fs_fifo_size_is_valid (data_bytes))
+ {
+ clib_warning ("fifo size out of range %d", data_bytes);
+ return 0;
+ }
+
+ fl_index = fs_free_list_for_size (data_bytes);
+
+ sh = fs->ssvm.sh;
+ ssvm_lock_non_recursive (sh, 1);
+
+ fsh = (fifo_segment_header_t *) sh->opaque[0];
+ vec_validate_init_empty (fsh->free_fifos, fl_index, 0);
+ f = fsh->free_fifos[fl_index];
+
+ /* Try to allocate batch of fifos */
+ if (PREDICT_FALSE (!f))
+ {
+ oldheap = ssvm_push_heap (sh);
+ allocate_new_fifo_batch (fsh, data_bytes,
+ FIFO_SEGMENT_ALLOC_BATCH_SIZE);
+ ssvm_pop_heap (oldheap);
+ f = fsh->free_fifos[fl_index];
+ }
+ if (PREDICT_TRUE (f != 0))
+ {
+ fsh->free_fifos[fl_index] = f->next;
+ /* (re)initialize the fifo, as in svm_fifo_create */
+ memset (f, 0, sizeof (*f));
+ svm_fifo_init (f, data_bytes);
+ goto found;
+ }
+
+ /* Failed to allocate batch, try just one fifo. This can also fail,
+ * in which case, create another segment */
+ oldheap = ssvm_push_heap (sh);
+ f = svm_fifo_create (data_bytes);
+ ssvm_pop_heap (oldheap);
+
+ if (PREDICT_FALSE (f == 0))
+ goto done;
+
+ f->freelist_index = fl_index;
+
+found:
+ /* If rx fifo type add to active fifos list. When cleaning up segment,
+ * we need a list of active sessions that should be disconnected. Since
+ * both rx and tx fifos keep pointers to the session, it's enough to track
+ * only one. */
+ if (ftype == FIFO_SEGMENT_RX_FIFO)
+ {
+ if (fsh->fifos)
+ {
+ fsh->fifos->prev = f;
+ f->next = fsh->fifos;
+ }
+ fsh->fifos = f;
+ f->flags |= SVM_FIFO_F_LL_TRACKED;
+ }
+ fsh->n_active_fifos++;
+
+done:
+ ssvm_unlock_non_recursive (sh);
+ return (f);
+}
+
+/**
+ * Free fifo allocated in fifo segment
+ */
+void
+fifo_segment_free_fifo (fifo_segment_t * s, svm_fifo_t * f)
+{
+ fifo_segment_header_t *fsh;
+ ssvm_shared_header_t *sh;
+ int fl_index;
+
+ ASSERT (f->refcnt > 0);
+
+ if (--f->refcnt > 0)
+ return;
+
+ sh = s->ssvm.sh;
+ fsh = (fifo_segment_header_t *) sh->opaque[0];
+ fl_index = f->freelist_index;
+
+ ASSERT (fl_index < vec_len (fsh->free_fifos));
+
+ ssvm_lock_non_recursive (sh, 2);
+
+ /* Remove from active list. Only rx fifos are tracked */
+ if (f->flags & SVM_FIFO_F_LL_TRACKED)
+ {
+ if (f->prev)
+ f->prev->next = f->next;
+ else
+ fsh->fifos = f->next;
+ if (f->next)
+ f->next->prev = f->prev;
+ f->flags &= ~SVM_FIFO_F_LL_TRACKED;
+ }
+
+ /* Add to free list */
+ f->next = fsh->free_fifos[fl_index];
+ f->prev = 0;
+ fsh->free_fifos[fl_index] = f;
+
+ if (CLIB_DEBUG)
+ {
+ f->master_session_index = ~0;
+ f->master_thread_index = ~0;
+ }
+
+ fsh->n_active_fifos--;
+ ssvm_unlock_non_recursive (sh);
+}
+
+/**
+ * Pre-allocates fifo pairs in fifo segment
+ */
+void
+fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
+ u32 rx_fifo_size, u32 tx_fifo_size,
+ u32 * n_fifo_pairs)
+{
+ u32 rx_rounded_data_size, tx_rounded_data_size, pair_size;
+ u32 rx_fifos_size, tx_fifos_size, pairs_to_allocate;
+ ssvm_shared_header_t *sh = fs->ssvm.sh;
+ fifo_segment_header_t *fsh = fs->h;
+ int i, rx_fl_index, tx_fl_index;
+ u8 *rx_fifo_mem, *tx_fifo_mem;
+ uword space_available;
+ void *oldheap;
+ svm_fifo_t *f;
+
+ /* Parameter check */
+ if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
+ return;
+
+ if (!fs_fifo_size_is_valid (rx_fifo_size))
+ {
+ clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
+ return;
+ }
+
+ if (!fs_fifo_size_is_valid (tx_fifo_size))
+ {
+ clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
+ return;
+ }
+
+ rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
+ rx_fl_index = fs_free_list_for_size (rx_fifo_size);
+ tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
+ tx_fl_index = fs_free_list_for_size (tx_fifo_size);
+
+ /* Calculate space requirements */
+ pair_size = 2 * sizeof (*f) + rx_rounded_data_size + tx_rounded_data_size;
+#if USE_DLMALLOC == 0
+ space_available = fs->ssvm.ssvm_size - mheap_bytes (sh->heap);
+#else
+ space_available = fs->ssvm.ssvm_size - mspace_usable_size (sh->heap);
+#endif
+
+ pairs_to_allocate = clib_min (space_available / pair_size, *n_fifo_pairs);
+ rx_fifos_size = (sizeof (*f) + rx_rounded_data_size) * pairs_to_allocate;
+ tx_fifos_size = (sizeof (*f) + tx_rounded_data_size) * pairs_to_allocate;
+
+ vec_validate_init_empty (fsh->free_fifos,
+ clib_max (rx_fl_index, tx_fl_index), 0);
+
+ oldheap = ssvm_push_heap (sh);
+
+ /* Allocate rx and tx fifo memory. May fail. */
+ rx_fifo_mem = clib_mem_alloc_aligned_at_offset (rx_fifos_size,
+ CLIB_CACHE_LINE_BYTES,
+ 0 /* align_offset */ ,
+ 0 /* os_out_of_memory */ );
+ tx_fifo_mem = clib_mem_alloc_aligned_at_offset (tx_fifos_size,
+ CLIB_CACHE_LINE_BYTES,
+ 0 /* align_offset */ ,
+ 0 /* os_out_of_memory */ );
+
+ /* Make sure it worked. Clean up if it didn't... */
+ if (rx_fifo_mem == 0 || tx_fifo_mem == 0)
+ {
+ rx_fifo_mem ? clib_mem_free (rx_fifo_mem) : clib_mem_free (tx_fifo_mem);
+ clib_warning ("fifo preallocation failure: rx size %d tx size %u "
+ "npairs %d", rx_fifo_size, tx_fifo_size, *n_fifo_pairs);
+ ssvm_pop_heap (oldheap);
+ return;
+ }
+
+ /* Carve rx and tx fifo memory */
+ for (i = 0; i < pairs_to_allocate; i++)
+ {
+ f = (svm_fifo_t *) rx_fifo_mem;
+ fifo_init_for_segment (fsh, f, rx_rounded_data_size, rx_fl_index);
+ rx_fifo_mem += sizeof (*f) + rx_rounded_data_size;
+
+ f = (svm_fifo_t *) tx_fifo_mem;
+ fifo_init_for_segment (fsh, f, tx_rounded_data_size, tx_fl_index);
+ tx_fifo_mem += sizeof (*f) + tx_rounded_data_size;
+ }
+
+ /* Account for the pairs allocated */
+ *n_fifo_pairs -= pairs_to_allocate;
+ ssvm_pop_heap (oldheap);
+}
+
+/**
+ * Get number of active fifos
+ */
+u32
+fifo_segment_num_fifos (fifo_segment_t * fs)
+{
+ return fs->h->n_active_fifos;
+}
+
+u32
+fifo_segment_num_free_fifos (fifo_segment_t * fs, u32 fifo_size_in_bytes)
+{
+ u32 count = 0, rounded_data_size, fl_index;
+ fifo_segment_header_t *fsh;
+ ssvm_shared_header_t *sh;
+ svm_fifo_t *f;
+ int i;
+
+ sh = fs->ssvm.sh;
+ fsh = (fifo_segment_header_t *) sh->opaque[0];
+
+ /* Count all free fifos? */
+ if (fifo_size_in_bytes == ~0)
+ {
+ for (i = 0; i < vec_len (fsh->free_fifos); i++)
+ {
+ f = fsh->free_fifos[i];
+ if (f == 0)
+ continue;
+
+ while (f)
+ {
+ f = f->next;
+ count++;
+ }
+ }
+ return count;
+ }
+
+ rounded_data_size = (1 << (max_log2 (fifo_size_in_bytes)));
+ fl_index = fs_free_list_for_size (rounded_data_size);
+
+ if (fl_index >= vec_len (fsh->free_fifos))
+ return 0;
+
+ f = fsh->free_fifos[fl_index];
+ if (f == 0)
+ return 0;
+
+ while (f)
+ {
+ f = f->next;
+ count++;
+ }
+ return count;
+}
+
+u8
+fifo_segment_has_fifos (fifo_segment_t * fs)
+{
+ return fs->h->fifos != 0;
+}
+
+svm_fifo_t *
+fifo_segment_get_fifo_list (fifo_segment_t * fs)
+{
+ return fs->h->fifos;
+}
+
+u8 *
+format_fifo_segment_type (u8 * s, va_list * args)
+{
+ fifo_segment_t *sp;
+ sp = va_arg (*args, fifo_segment_t *);
+ ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
+
+ if (st == SSVM_SEGMENT_PRIVATE)
+ s = format (s, "%s", "private-heap");
+ else if (st == SSVM_SEGMENT_MEMFD)
+ s = format (s, "%s", "memfd");
+ else if (st == SSVM_SEGMENT_SHM)
+ s = format (s, "%s", "shm");
+ else
+ s = format (s, "%s", "unknown");
+ return s;
+}
+
+/**
+ * Segment format function
+ */
+u8 *
+format_fifo_segment (u8 * s, va_list * args)
+{
+ fifo_segment_t *sp = va_arg (*args, fifo_segment_t *);
+ int verbose __attribute__ ((unused)) = va_arg (*args, int);
+ fifo_segment_header_t *fsh = sp->h;
+ u32 count, indent;
+ svm_fifo_t *f;
+ int i;
+
+ indent = format_get_indent (s) + 2;
+#if USE_DLMALLOC == 0
+ s = format (s, "%U segment heap: %U\n", format_white_space, indent,
+ format_mheap, svm_fifo_segment_heap (sp), verbose);
+ s = format (s, "%U segment has %u active fifos\n",
+ format_white_space, indent, fifo_segment_num_fifos (sp));
+#endif
+
+ for (i = 0; i < vec_len (fsh->free_fifos); i++)
+ {
+ f = fsh->free_fifos[i];
+ if (f == 0)
+ continue;
+ count = 0;
+ while (f)
+ {
+ f = f->next;
+ count++;
+ }
+
+ s = format (s, "%U%-5u Kb: %u free",
+ format_white_space, indent + 2,
+ 1 << (i + max_log2 (FIFO_SEGMENT_MIN_FIFO_SIZE) - 10),
+ count);
+ }
+ return s;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */