/*
- * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Copyright (c) 2017-2019 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:
#include <vnet/session/session.h>
#include <vnet/session/application.h>
-/**
- * Counter used to build segment names
- */
-u32 segment_name_counter = 0;
+typedef struct segment_manager_main_
+{
+ segment_manager_t *segment_managers; /**< Pool of segment managers */
+ u32 seg_name_counter; /**< Counter for segment names */
+
+ /*
+ * Configuration
+ */
+ u32 default_fifo_size; /**< default rx/tx fifo size */
+ u32 default_segment_size; /**< default fifo segment size */
+ u32 default_app_mq_size; /**< default app msg q size */
+ u32 default_max_fifo_size; /**< default max fifo size */
+ u8 default_high_watermark; /**< default high watermark % */
+ u8 default_low_watermark; /**< default low watermark % */
+} segment_manager_main_t;
+
+static segment_manager_main_t sm_main;
+
+#define segment_manager_foreach_segment_w_lock(VAR, SM, BODY) \
+do { \
+ clib_rwlock_reader_lock (&(SM)->segments_rwlock); \
+ pool_foreach((VAR), ((SM)->segments)) (BODY); \
+ clib_rwlock_reader_unlock (&(SM)->segments_rwlock); \
+} while (0)
+
+static segment_manager_props_t *
+segment_manager_properties_get (segment_manager_t * sm)
+{
+ app_worker_t *app_wrk = app_worker_get (sm->app_wrk_index);
+ return application_get_segment_manager_properties (app_wrk->app_index);
+}
+
+segment_manager_props_t *
+segment_manager_props_init (segment_manager_props_t * props)
+{
+ props->add_segment_size = sm_main.default_segment_size;
+ props->rx_fifo_size = sm_main.default_fifo_size;
+ props->tx_fifo_size = sm_main.default_fifo_size;
+ props->evt_q_size = sm_main.default_app_mq_size;
+ props->max_fifo_size = sm_main.default_max_fifo_size;
+ props->high_watermark = sm_main.default_high_watermark;
+ props->low_watermark = sm_main.default_low_watermark;
+ props->n_slices = vlib_num_workers () + 1;
+ return props;
+}
+
+u8
+segment_manager_app_detached (segment_manager_t * sm)
+{
+ return (sm->flags & SEG_MANAGER_F_DETACHED);
+}
+
+void
+segment_manager_app_detach (segment_manager_t * sm)
+{
+ sm->flags |= SEG_MANAGER_F_DETACHED;
+}
+
+always_inline u32
+segment_manager_segment_index (segment_manager_t * sm, fifo_segment_t * seg)
+{
+ return (seg - sm->segments);
+}
/**
- * Pool of segment managers
+ * Adds segment to segment manager's pool
+ *
+ * If needed a writer's lock is acquired before allocating a new segment
+ * to avoid affecting any of the segments pool readers.
*/
-segment_manager_t *segment_managers = 0;
+int
+segment_manager_add_segment (segment_manager_t *sm, uword segment_size,
+ u8 notify_app)
+{
+ segment_manager_main_t *smm = &sm_main;
+ segment_manager_props_t *props;
+ fifo_segment_t *fs;
+ u32 fs_index = ~0;
+ u8 *seg_name;
+ int rv;
+
+ props = segment_manager_properties_get (sm);
+
+ /* Not configured for addition of new segments and not first */
+ if (!props->add_segment && !segment_size)
+ {
+ clib_warning ("cannot allocate new segment");
+ return VNET_API_ERROR_INVALID_VALUE;
+ }
+
+ /*
+ * Allocate fifo segment and grab lock if needed
+ */
+ if (vlib_num_workers ())
+ clib_rwlock_writer_lock (&sm->segments_rwlock);
+
+ pool_get_zero (sm->segments, fs);
+
+ /*
+ * Allocate ssvm segment
+ */
+ segment_size = segment_size ? segment_size : props->add_segment_size;
+ segment_size = round_pow2 (segment_size, clib_mem_get_page_size ());
+
+ if (props->segment_type != SSVM_SEGMENT_PRIVATE)
+ {
+ seg_name = format (0, "%d-%d%c", getpid (), smm->seg_name_counter++, 0);
+ }
+ else
+ {
+ app_worker_t *app_wrk = app_worker_get (sm->app_wrk_index);
+ application_t *app = application_get (app_wrk->app_index);
+ seg_name = format (0, "%v segment%c", app->name, 0);
+ }
+
+ fs->ssvm.ssvm_size = segment_size;
+ fs->ssvm.name = seg_name;
+ fs->ssvm.requested_va = 0;
+
+ if ((rv = ssvm_server_init (&fs->ssvm, props->segment_type)))
+ {
+ clib_warning ("svm_master_init ('%v', %u) failed", seg_name,
+ segment_size);
+ pool_put (sm->segments, fs);
+ goto done;
+ }
+
+ /*
+ * Initialize fifo segment
+ */
+ fs->n_slices = props->n_slices;
+ fifo_segment_init (fs);
+
+ /*
+ * Save segment index before dropping lock, if any held
+ */
+ fs_index = fs - sm->segments;
+
+ /*
+ * Set watermarks in segment
+ */
+ fs->h->high_watermark = sm->high_watermark;
+ fs->h->low_watermark = sm->low_watermark;
+ fs->h->pct_first_alloc = props->pct_first_alloc;
+ fs->h->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
+
+ if (notify_app)
+ {
+ app_worker_t *app_wrk;
+ u64 fs_handle;
+ fs_handle = segment_manager_segment_handle (sm, fs);
+ app_wrk = app_worker_get (sm->app_wrk_index);
+ rv = app_worker_add_segment_notify (app_wrk, fs_handle);
+ if (rv)
+ return rv;
+ }
+done:
+
+ if (vlib_num_workers ())
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
+
+ return fs_index;
+}
/**
- * Process private segment index
+ * Remove segment without lock
*/
-u32 private_segment_index = ~0;
+void
+segment_manager_del_segment (segment_manager_t * sm, fifo_segment_t * fs)
+{
+ if (ssvm_type (&fs->ssvm) != SSVM_SEGMENT_PRIVATE)
+ {
+ if (!segment_manager_app_detached (sm))
+ {
+ app_worker_t *app_wrk;
+ u64 segment_handle;
+ app_wrk = app_worker_get (sm->app_wrk_index);
+ segment_handle = segment_manager_segment_handle (sm, fs);
+ app_worker_del_segment_notify (app_wrk, segment_handle);
+ }
+ }
+
+ fifo_segment_cleanup (fs);
+ ssvm_delete (&fs->ssvm);
+
+ if (CLIB_DEBUG)
+ clib_memset (fs, 0xfb, sizeof (*fs));
+ pool_put (sm->segments, fs);
+}
+
+static fifo_segment_t *
+segment_manager_get_segment_if_valid (segment_manager_t * sm,
+ u32 segment_index)
+{
+ if (pool_is_free_index (sm->segments, segment_index))
+ return 0;
+ return pool_elt_at_index (sm->segments, segment_index);
+}
/**
- * Default fifo and segment size. TODO config.
+ * Removes segment after acquiring writer lock
*/
-u32 default_fifo_size = 1 << 16;
-u32 default_segment_size = 1 << 20;
+static inline void
+sm_lock_and_del_segment_inline (segment_manager_t * sm, u32 fs_index)
+{
+ fifo_segment_t *fs;
+ u8 is_prealloc;
+
+ clib_rwlock_writer_lock (&sm->segments_rwlock);
+
+ fs = segment_manager_get_segment_if_valid (sm, fs_index);
+ if (!fs)
+ goto done;
+
+ is_prealloc = fifo_segment_flags (fs) & FIFO_SEGMENT_F_IS_PREALLOCATED;
+ if (is_prealloc && !segment_manager_app_detached (sm))
+ goto done;
+
+ segment_manager_del_segment (sm, fs);
+
+done:
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
+}
void
-segment_manager_get_segment_info (u32 index, u8 ** name, u32 * size)
+segment_manager_lock_and_del_segment (segment_manager_t * sm, u32 fs_index)
{
- svm_fifo_segment_private_t *s;
- s = svm_fifo_get_segment (index);
- *name = s->h->segment_name;
- *size = s->ssvm.ssvm_size;
+ sm_lock_and_del_segment_inline (sm, fs_index);
}
-always_inline int
-session_manager_add_segment_i (segment_manager_t * sm, u32 segment_size,
- u8 * segment_name)
+/**
+ * Reads a segment from the segment manager's pool without lock
+ */
+fifo_segment_t *
+segment_manager_get_segment (segment_manager_t * sm, u32 segment_index)
{
- svm_fifo_segment_create_args_t _ca, *ca = &_ca;
- int rv;
+ return pool_elt_at_index (sm->segments, segment_index);
+}
- memset (ca, 0, sizeof (*ca));
+u64
+segment_manager_segment_handle (segment_manager_t * sm,
+ fifo_segment_t * segment)
+{
+ u32 segment_index = segment_manager_segment_index (sm, segment);
+ return (((u64) segment_manager_index (sm) << 32) | segment_index);
+}
- ca->segment_name = (char *) segment_name;
- ca->segment_size = segment_size;
+u64
+segment_manager_make_segment_handle (u32 segment_manager_index,
+ u32 segment_index)
+{
+ return (((u64) segment_manager_index << 32) | segment_index);
+}
- rv = svm_fifo_segment_create (ca);
- if (rv)
- {
- clib_warning ("svm_fifo_segment_create ('%s', %d) failed",
- ca->segment_name, ca->segment_size);
- vec_free (segment_name);
- return VNET_API_ERROR_SVM_SEGMENT_CREATE_FAIL;
- }
+fifo_segment_t *
+segment_manager_get_segment_w_handle (u64 segment_handle)
+{
+ u32 sm_index, segment_index;
+ segment_manager_t *sm;
- vec_add1 (sm->segment_indices, ca->new_segment_index);
+ segment_manager_parse_segment_handle (segment_handle, &sm_index,
+ &segment_index);
+ sm = segment_manager_get (sm_index);
+ if (!sm || pool_is_free_index (sm->segments, segment_index))
+ return 0;
+ return pool_elt_at_index (sm->segments, segment_index);
+}
- return 0;
+/**
+ * Reads a segment from the segment manager's pool and acquires reader lock
+ *
+ * Caller must drop the reader's lock by calling
+ * @ref segment_manager_segment_reader_unlock once it finishes working with
+ * the segment.
+ */
+fifo_segment_t *
+segment_manager_get_segment_w_lock (segment_manager_t * sm, u32 segment_index)
+{
+ clib_rwlock_reader_lock (&sm->segments_rwlock);
+ return pool_elt_at_index (sm->segments, segment_index);
}
-int
-session_manager_add_segment (segment_manager_t * sm)
+void
+segment_manager_segment_reader_lock (segment_manager_t * sm)
{
- u8 *segment_name;
- svm_fifo_segment_create_args_t _ca, *ca = &_ca;
- u32 add_segment_size;
- int rv;
+ clib_rwlock_reader_lock (&sm->segments_rwlock);
+}
- memset (ca, 0, sizeof (*ca));
- segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
- add_segment_size = sm->properties->add_segment_size ?
- sm->properties->add_segment_size : default_segment_size;
+void
+segment_manager_segment_reader_unlock (segment_manager_t * sm)
+{
+ clib_rwlock_reader_unlock (&sm->segments_rwlock);
+}
- rv = session_manager_add_segment_i (sm, add_segment_size, segment_name);
- vec_free (segment_name);
- return rv;
+void
+segment_manager_segment_writer_unlock (segment_manager_t * sm)
+{
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
}
-int
-session_manager_add_first_segment (segment_manager_t * sm, u32 segment_size)
+segment_manager_t *
+segment_manager_alloc (void)
{
- svm_fifo_segment_create_args_t _ca, *ca = &_ca;
- u8 *segment_name;
- int rv;
+ segment_manager_main_t *smm = &sm_main;
+ segment_manager_t *sm;
- memset (ca, 0, sizeof (*ca));
- segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
- rv = session_manager_add_segment_i (sm, segment_size, segment_name);
- vec_free (segment_name);
- return rv;
+ pool_get_zero (smm->segment_managers, sm);
+ clib_rwlock_init (&sm->segments_rwlock);
+ return sm;
}
-static void
-segment_manager_alloc_process_private_segment ()
+int
+segment_manager_init (segment_manager_t * sm)
{
- svm_fifo_segment_create_args_t _a, *a = &_a;
-
- if (private_segment_index != ~0)
- return;
+ segment_manager_props_t *props;
- memset (a, 0, sizeof (*a));
- a->segment_name = "process-private-segment";
- a->segment_size = ~0;
- a->new_segment_index = ~0;
+ props = segment_manager_properties_get (sm);
- if (svm_fifo_segment_create_process_private (a))
- clib_warning ("Failed to create process private segment");
+ sm->max_fifo_size = props->max_fifo_size ?
+ props->max_fifo_size : sm_main.default_max_fifo_size;
+ sm->max_fifo_size = clib_max (sm->max_fifo_size, 4096);
- private_segment_index = a->new_segment_index;
- ASSERT (private_segment_index != ~0);
+ segment_manager_set_watermarks (sm,
+ props->high_watermark,
+ props->low_watermark);
+ return 0;
}
/**
* Initializes segment manager based on options provided.
- * Returns error if svm segment allocation fails.
+ * Returns error if ssvm segment(s) allocation fails.
*/
int
-segment_manager_init (segment_manager_t * sm,
- segment_manager_properties_t * properties,
- u32 first_seg_size)
+segment_manager_init_first (segment_manager_t * sm)
{
- int rv;
-
- /* app allocates these */
- sm->properties = properties;
+ segment_manager_props_t *props;
+ uword first_seg_size;
+ fifo_segment_t *fs;
+ int fs_index, i;
- first_seg_size = first_seg_size > 0 ? first_seg_size : default_segment_size;
+ segment_manager_init (sm);
+ props = segment_manager_properties_get (sm);
+ first_seg_size = clib_max (props->segment_size,
+ sm_main.default_segment_size);
- if (sm->properties->use_private_segment == 0)
+ if (props->prealloc_fifos)
{
- rv = session_manager_add_first_segment (sm, first_seg_size);
- if (rv)
+ u64 approx_total_size, max_seg_size = ((u64) 1 << 32) - (128 << 10);
+ u32 rx_rounded_data_size, tx_rounded_data_size;
+ u32 prealloc_fifo_pairs = props->prealloc_fifos;
+ u32 rx_fifo_size, tx_fifo_size, pair_size;
+ u32 approx_segment_count;
+
+ /* Figure out how many segments should be preallocated */
+ rx_rounded_data_size = (1 << (max_log2 (props->rx_fifo_size)));
+ tx_rounded_data_size = (1 << (max_log2 (props->tx_fifo_size)));
+
+ rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
+ tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
+ pair_size = rx_fifo_size + tx_fifo_size;
+
+ approx_total_size = (u64) prealloc_fifo_pairs *pair_size;
+ if (first_seg_size > approx_total_size)
+ max_seg_size = first_seg_size;
+ approx_segment_count = (approx_total_size + (max_seg_size - 1))
+ / max_seg_size;
+
+ /* Allocate the segments */
+ for (i = 0; i < approx_segment_count + 1; i++)
{
- clib_warning ("Failed to allocate segment");
- return rv;
+ fs_index = segment_manager_add_segment (sm, max_seg_size, 0);
+ if (fs_index < 0)
+ {
+ clib_warning ("Failed to preallocate segment %d", i);
+ return fs_index;
+ }
+
+ fs = segment_manager_get_segment (sm, fs_index);
+ if (i == 0)
+ sm->event_queue = segment_manager_alloc_queue (fs, props);
+
+ fifo_segment_preallocate_fifo_pairs (fs,
+ props->rx_fifo_size,
+ props->tx_fifo_size,
+ &prealloc_fifo_pairs);
+ fifo_segment_flags (fs) = FIFO_SEGMENT_F_IS_PREALLOCATED;
+ if (prealloc_fifo_pairs == 0)
+ break;
}
+ return 0;
}
- else
+
+ fs_index = segment_manager_add_segment (sm, first_seg_size, 0);
+ if (fs_index < 0)
{
- if (private_segment_index == ~0)
- segment_manager_alloc_process_private_segment ();
- ASSERT (private_segment_index != ~0);
- vec_add1 (sm->segment_indices, private_segment_index);
+ clib_warning ("Failed to allocate segment");
+ return fs_index;
+ }
+
+ fs = segment_manager_get_segment (sm, fs_index);
+ sm->event_queue = segment_manager_alloc_queue (fs, props);
+
+ if (props->prealloc_fifo_hdrs)
+ {
+ u32 hdrs_per_slice;
+
+ /* Do not preallocate on slice associated to main thread */
+ i = (vlib_num_workers ()? 1 : 0);
+ hdrs_per_slice = props->prealloc_fifo_hdrs / (fs->n_slices - i);
+
+ for (; i < fs->n_slices; i++)
+ {
+ if (fifo_segment_prealloc_fifo_hdrs (fs, i, hdrs_per_slice))
+ return VNET_API_ERROR_SVM_SEGMENT_CREATE_FAIL;
+ }
}
- clib_spinlock_init (&sm->lockp);
return 0;
}
+void
+segment_manager_cleanup_detached_listener (segment_manager_t * sm)
+{
+ app_worker_t *app_wrk;
+
+ app_wrk = app_worker_get_if_valid (sm->app_wrk_index);
+ if (!app_wrk)
+ return;
+
+ app_worker_del_detached_sm (app_wrk, segment_manager_index (sm));
+}
+
/**
- * Removes segment manager.
- *
- * Since the fifos allocated in the segment keep backpointers to the sessions
- * prior to removing the segment, we call session disconnect. This
- * subsequently propages into transport.
+ * Cleanup segment manager.
*/
void
-segment_manager_del (segment_manager_t * sm)
+segment_manager_free (segment_manager_t * sm)
{
- u32 *deleted_sessions = 0;
- u32 *deleted_thread_indices = 0;
- int i, j;
+ segment_manager_main_t *smm = &sm_main;
+ fifo_segment_t *fifo_segment;
+
+ ASSERT (vlib_get_thread_index () == 0
+ && !segment_manager_has_fifos (sm)
+ && segment_manager_app_detached (sm));
+
+ if (sm->flags & SEG_MANAGER_F_DETACHED_LISTENER)
+ segment_manager_cleanup_detached_listener (sm);
+
+ /* If we have empty preallocated segments that haven't been removed, remove
+ * them now. Apart from that, the first segment in the first segment manager
+ * is not removed when all fifos are removed. It can only be removed when
+ * the manager is explicitly deleted/detached by the app. */
+ clib_rwlock_writer_lock (&sm->segments_rwlock);
+
+ /* *INDENT-OFF* */
+ pool_foreach (fifo_segment, sm->segments) {
+ segment_manager_del_segment (sm, fifo_segment);
+ }
+ /* *INDENT-ON* */
+
+ pool_free (sm->segments);
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
+
+ clib_rwlock_free (&sm->segments_rwlock);
+ if (CLIB_DEBUG)
+ clib_memset (sm, 0xfe, sizeof (*sm));
+ pool_put (smm->segment_managers, sm);
+}
- /* Across all fifo segments used by the server */
- for (j = 0; j < vec_len (sm->segment_indices); j++)
+static void
+sm_free_w_index_helper (void *arg)
+{
+ u32 sm_index = *(u32 *) arg;
+ segment_manager_t *sm;
+
+ ASSERT (vlib_get_thread_index () == 0);
+
+ if ((sm = segment_manager_get_if_valid (sm_index)))
+ segment_manager_free (sm);
+}
+
+void
+segment_manager_free_safe (segment_manager_t *sm)
+{
+ if (!vlib_thread_is_main_w_barrier ())
{
- svm_fifo_segment_private_t *fifo_segment;
- svm_fifo_t **fifos;
- /* Vector of fifos allocated in the segment */
- fifo_segment = svm_fifo_get_segment (sm->segment_indices[j]);
- fifos = svm_fifo_segment_get_fifos (fifo_segment);
-
- /*
- * Remove any residual sessions from the session lookup table
- * Don't bother deleting the individual fifos, we're going to
- * throw away the fifo segment in a minute.
- */
- for (i = 0; i < vec_len (fifos); i++)
- {
- svm_fifo_t *fifo;
- u32 session_index, thread_index;
- stream_session_t *session;
+ u32 sm_index = segment_manager_index (sm);
+ vlib_rpc_call_main_thread (sm_free_w_index_helper, (u8 *) & sm_index,
+ sizeof (sm_index));
+ }
+ else
+ {
+ segment_manager_free (sm);
+ }
+}
- fifo = fifos[i];
- session_index = fifo->master_session_index;
- thread_index = fifo->master_thread_index;
+void
+segment_manager_init_free (segment_manager_t * sm)
+{
+ ASSERT (vlib_get_thread_index () == 0);
- session = stream_session_get (session_index, thread_index);
+ segment_manager_app_detach (sm);
+ if (segment_manager_has_fifos (sm))
+ segment_manager_del_sessions (sm);
+ else
+ {
+ ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
+ segment_manager_free (sm);
+ }
+}
- /* Add to the deleted_sessions vector (once!) */
- if (!session->is_deleted)
- {
- session->is_deleted = 1;
- vec_add1 (deleted_sessions, session_index);
- vec_add1 (deleted_thread_indices, thread_index);
- }
- }
+segment_manager_t *
+segment_manager_get (u32 index)
+{
+ return pool_elt_at_index (sm_main.segment_managers, index);
+}
- for (i = 0; i < vec_len (deleted_sessions); i++)
- {
- stream_session_t *session;
- session = stream_session_get (deleted_sessions[i],
- deleted_thread_indices[i]);
-
- /* Instead of directly removing the session call disconnect */
- session_send_session_evt_to_thread (stream_session_handle (session),
- FIFO_EVENT_DISCONNECT,
- deleted_thread_indices[i]);
-
- /*
- stream_session_table_del (smm, session);
- pool_put(smm->sessions[deleted_thread_indices[i]], session);
- */
- }
+segment_manager_t *
+segment_manager_get_if_valid (u32 index)
+{
+ if (pool_is_free_index (sm_main.segment_managers, index))
+ return 0;
+ return pool_elt_at_index (sm_main.segment_managers, index);
+}
- vec_reset_length (deleted_sessions);
- vec_reset_length (deleted_thread_indices);
+u32
+segment_manager_index (segment_manager_t * sm)
+{
+ return sm - sm_main.segment_managers;
+}
- /* Instead of removing the segment, test when removing the session if
- * the segment can be removed
- */
- /* svm_fifo_segment_delete (fifo_segment); */
- }
+u8
+segment_manager_has_fifos (segment_manager_t * sm)
+{
+ fifo_segment_t *seg;
+ u8 first = 1;
+
+ /* *INDENT-OFF* */
+ segment_manager_foreach_segment_w_lock (seg, sm, ({
+ if (CLIB_DEBUG && !first && !fifo_segment_has_fifos (seg)
+ && !(fifo_segment_flags (seg) & FIFO_SEGMENT_F_IS_PREALLOCATED))
+ {
+ clib_warning ("segment %d has no fifos!",
+ segment_manager_segment_index (sm, seg));
+ first = 0;
+ }
+ if (fifo_segment_has_fifos (seg))
+ {
+ segment_manager_segment_reader_unlock (sm);
+ return 1;
+ }
+ }));
+ /* *INDENT-ON* */
- clib_spinlock_free (&sm->lockp);
- vec_free (deleted_sessions);
- vec_free (deleted_thread_indices);
- pool_put (segment_managers, sm);
+ return 0;
}
-static int
-segment_manager_notify_app_seg_add (segment_manager_t * sm,
- u32 fifo_segment_index)
+/**
+ * Initiate disconnects for all sessions 'owned' by a segment manager
+ */
+void
+segment_manager_del_sessions (segment_manager_t * sm)
{
- application_t *app = application_get (sm->app_index);
- u32 seg_size = 0;
- u8 *seg_name;
+ session_handle_t *handles = 0, *handle;
+ fifo_segment_t *fs;
+ session_t *session;
+ int slice_index;
+ svm_fifo_t *f;
- /* Send an API message to the external app, to map new segment */
- ASSERT (app->cb_fns.add_segment_callback);
+ ASSERT (pool_elts (sm->segments) != 0);
- segment_manager_get_segment_info (fifo_segment_index, &seg_name, &seg_size);
- return app->cb_fns.add_segment_callback (app->api_client_index, seg_name,
- seg_size);
+ /* Across all fifo segments used by the server */
+ /* *INDENT-OFF* */
+ segment_manager_foreach_segment_w_lock (fs, sm, ({
+ for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
+ {
+ f = fifo_segment_get_slice_fifo_list (fs, slice_index);
+
+ /*
+ * Remove any residual sessions from the session lookup table
+ * Don't bother deleting the individual fifos, we're going to
+ * throw away the fifo segment in a minute.
+ */
+ while (f)
+ {
+ session = session_get_if_valid (f->shr->master_session_index,
+ f->master_thread_index);
+ if (session)
+ vec_add1 (handles, session_handle (session));
+ f = f->next;
+ }
+ }
+
+ /* Instead of removing the segment, test when cleaning up disconnected
+ * sessions if the segment can be removed.
+ */
+ }));
+ /* *INDENT-ON* */
+
+ vec_foreach (handle, handles)
+ {
+ session = session_get_from_handle (*handle);
+ session_close (session);
+ /* Avoid propagating notifications back to the app */
+ session->app_wrk_index = APP_INVALID_INDEX;
+ }
+ vec_free (handles);
}
-int
-segment_manager_alloc_session_fifos (segment_manager_t * sm,
- svm_fifo_t ** server_rx_fifo,
- svm_fifo_t ** server_tx_fifo,
- u32 * fifo_segment_index)
+/**
+ * Initiate disconnects for sessions in specified state 'owned' by a segment
+ * manager
+ */
+void
+segment_manager_del_sessions_filter (segment_manager_t *sm,
+ session_state_t *states)
{
- svm_fifo_segment_private_t *fifo_segment;
- u32 fifo_size, sm_index;
- u8 added_a_segment = 0;
- int i;
+ session_handle_t *handles = 0, *handle;
+ fifo_segment_t *fs;
+ session_t *session;
+ int slice_index;
+ svm_fifo_t *f;
- ASSERT (vec_len (sm->segment_indices));
+ ASSERT (pool_elts (sm->segments) != 0);
- /* Make sure we don't have multiple threads trying to allocate segments
- * at the same time. */
- clib_spinlock_lock (&sm->lockp);
+ /* Across all fifo segments used by the server */
+ segment_manager_foreach_segment_w_lock (
+ fs, sm, ({
+ for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
+ {
+ f = fifo_segment_get_slice_fifo_list (fs, slice_index);
+ while (f)
+ {
+ session = session_get_if_valid (f->shr->master_session_index,
+ f->master_thread_index);
+ if (session)
+ {
+ session_state_t *state;
+ vec_foreach (state, states)
+ {
+ if (session->session_state == *state)
+ {
+ vec_add1 (handles, session_handle (session));
+ break;
+ }
+ }
+ }
+ f = f->next;
+ }
+ }
+ }));
- /* Allocate svm fifos */
-again:
- for (i = 0; i < vec_len (sm->segment_indices); i++)
+ vec_foreach (handle, handles)
{
- *fifo_segment_index = sm->segment_indices[i];
- fifo_segment = svm_fifo_get_segment (*fifo_segment_index);
+ session = session_get_from_handle (*handle);
+ session_close (session);
+ /* Avoid propagating notifications back to the app */
+ session->app_wrk_index = APP_INVALID_INDEX;
+ }
+ vec_free (handles);
+}
- fifo_size = sm->properties->rx_fifo_size;
- fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
- *server_rx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size);
+int
+segment_manager_try_alloc_fifos (fifo_segment_t * fifo_segment,
+ u32 thread_index,
+ u32 rx_fifo_size, u32 tx_fifo_size,
+ svm_fifo_t ** rx_fifo, svm_fifo_t ** tx_fifo)
+{
+ rx_fifo_size = clib_max (rx_fifo_size, sm_main.default_fifo_size);
+ *rx_fifo = fifo_segment_alloc_fifo_w_slice (fifo_segment, thread_index,
+ rx_fifo_size,
+ FIFO_SEGMENT_RX_FIFO);
- fifo_size = sm->properties->tx_fifo_size;
- fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
- *server_tx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size);
+ tx_fifo_size = clib_max (tx_fifo_size, sm_main.default_fifo_size);
+ *tx_fifo = fifo_segment_alloc_fifo_w_slice (fifo_segment, thread_index,
+ tx_fifo_size,
+ FIFO_SEGMENT_TX_FIFO);
- if (*server_rx_fifo == 0)
+ if (*rx_fifo == 0)
+ {
+ /* This would be very odd, but handle it... */
+ if (*tx_fifo != 0)
{
- /* This would be very odd, but handle it... */
- if (*server_tx_fifo != 0)
- {
- svm_fifo_segment_free_fifo (fifo_segment, *server_tx_fifo);
- *server_tx_fifo = 0;
- }
- continue;
+ fifo_segment_free_fifo (fifo_segment, *tx_fifo);
+ *tx_fifo = 0;
}
- if (*server_tx_fifo == 0)
+ return -1;
+ }
+ if (*tx_fifo == 0)
+ {
+ if (*rx_fifo != 0)
{
- if (*server_rx_fifo != 0)
- {
- svm_fifo_segment_free_fifo (fifo_segment, *server_rx_fifo);
- *server_rx_fifo = 0;
- }
- continue;
+ fifo_segment_free_fifo (fifo_segment, *rx_fifo);
+ *rx_fifo = 0;
}
- break;
+ return -1;
}
- /* See if we're supposed to create another segment */
- if (*server_rx_fifo == 0)
- {
- if (sm->properties->add_segment)
+ return 0;
+}
+
+int
+segment_manager_alloc_session_fifos (segment_manager_t * sm,
+ u32 thread_index,
+ svm_fifo_t ** rx_fifo,
+ svm_fifo_t ** tx_fifo)
+{
+ int alloc_fail = 1, rv = 0, new_fs_index;
+ uword free_bytes, max_free_bytes = 0;
+ segment_manager_props_t *props;
+ fifo_segment_t *fs = 0, *cur;
+ u32 sm_index, fs_index;
+
+ props = segment_manager_properties_get (sm);
+
+ /*
+ * Find the first free segment to allocate the fifos in
+ */
+
+ segment_manager_segment_reader_lock (sm);
+
+ pool_foreach (cur, sm->segments) {
+ if (fifo_segment_flags (cur) & FIFO_SEGMENT_F_CUSTOM_USE)
+ continue;
+ free_bytes = fifo_segment_available_bytes (cur);
+ if (free_bytes > max_free_bytes)
{
- if (added_a_segment)
- {
- clib_warning ("added a segment, still cant allocate a fifo");
- return SESSION_ERROR_NEW_SEG_NO_SPACE;
- }
+ max_free_bytes = free_bytes;
+ fs = cur;
+ }
+ }
- if (session_manager_add_segment (sm))
- {
- return VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
- }
+ if (fs)
+ {
+ alloc_fail = segment_manager_try_alloc_fifos (fs, thread_index,
+ props->rx_fifo_size,
+ props->tx_fifo_size,
+ rx_fifo, tx_fifo);
+ /* On success, keep lock until fifos are initialized */
+ if (!alloc_fail)
+ goto alloc_success;
+ }
- added_a_segment = 1;
- goto again;
+ segment_manager_segment_reader_unlock (sm);
+
+ /*
+ * Allocation failed, see if we can add a new segment
+ */
+ if (props->add_segment)
+ {
+ if ((new_fs_index = segment_manager_add_segment (sm, 0, 1)) < 0)
+ {
+ clib_warning ("Failed to add new segment");
+ return SESSION_E_SEG_CREATE;
}
- else
+ fs = segment_manager_get_segment_w_lock (sm, new_fs_index);
+ alloc_fail = segment_manager_try_alloc_fifos (fs, thread_index,
+ props->rx_fifo_size,
+ props->tx_fifo_size,
+ rx_fifo, tx_fifo);
+ if (alloc_fail)
{
- clib_warning ("No space to allocate fifos!");
- return SESSION_ERROR_NO_SPACE;
+ clib_warning ("Added a segment, still can't allocate a fifo");
+ segment_manager_segment_reader_unlock (sm);
+ return SESSION_E_SEG_NO_SPACE2;
}
}
+ else
+ {
+ SESSION_DBG ("Can't add new seg and no space to allocate fifos!");
+ return SESSION_E_SEG_NO_SPACE;
+ }
- /* Backpointers to segment manager */
- sm_index = segment_manager_index (sm);
- (*server_tx_fifo)->segment_manager = sm_index;
- (*server_rx_fifo)->segment_manager = sm_index;
+alloc_success:
+ ASSERT (rx_fifo && tx_fifo);
- clib_spinlock_unlock (&sm->lockp);
+ sm_index = segment_manager_index (sm);
+ fs_index = segment_manager_segment_index (sm, fs);
+ (*tx_fifo)->segment_manager = sm_index;
+ (*rx_fifo)->segment_manager = sm_index;
+ (*tx_fifo)->segment_index = fs_index;
+ (*rx_fifo)->segment_index = fs_index;
- if (added_a_segment)
- return segment_manager_notify_app_seg_add (sm, *fifo_segment_index);
+ /* Drop the lock after app is notified */
+ segment_manager_segment_reader_unlock (sm);
- return 0;
+ return rv;
}
void
-segment_manager_dealloc_fifos (u32 svm_segment_index, svm_fifo_t * rx_fifo,
- svm_fifo_t * tx_fifo)
+segment_manager_dealloc_fifos (svm_fifo_t * rx_fifo, svm_fifo_t * tx_fifo)
{
segment_manager_t *sm;
- svm_fifo_segment_private_t *fifo_segment;
+ fifo_segment_t *fs;
+ u32 segment_index;
- sm = segment_manager_get_if_valid (rx_fifo->segment_manager);
+ if (!rx_fifo || !tx_fifo)
+ return;
/* It's possible to have no segment manager if the session was removed
- * as result of a detach */
- if (!sm)
+ * as result of a detach. */
+ if (!(sm = segment_manager_get_if_valid (rx_fifo->segment_manager)))
return;
- fifo_segment = svm_fifo_get_segment (svm_segment_index);
- svm_fifo_segment_free_fifo (fifo_segment, rx_fifo);
- svm_fifo_segment_free_fifo (fifo_segment, tx_fifo);
-
- /* Remove segment only if it holds no fifos and not the first */
- if (sm->segment_indices[0] != svm_segment_index
- && !svm_fifo_segment_has_fifos (fifo_segment))
+ segment_index = rx_fifo->segment_index;
+ fs = segment_manager_get_segment_w_lock (sm, segment_index);
+ fifo_segment_free_fifo (fs, rx_fifo);
+ fifo_segment_free_fifo (fs, tx_fifo);
+
+ /*
+ * Try to remove svm segment if it has no fifos. This can be done only if
+ * the segment is not the first in the segment manager or if it is first
+ * and it is not protected. Moreover, if the segment is first and the app
+ * has detached from the segment manager, remove the segment manager.
+ */
+ if (!fifo_segment_has_fifos (fs))
{
- svm_fifo_segment_delete (fifo_segment);
- vec_del1 (sm->segment_indices, svm_segment_index);
+ segment_manager_segment_reader_unlock (sm);
+
+ /* Remove segment if it holds no fifos or first but not protected */
+ if (segment_index != 0 || !sm->first_is_protected)
+ sm_lock_and_del_segment_inline (sm, segment_index);
+
+ /* Remove segment manager if no sessions and detached from app */
+ if (segment_manager_app_detached (sm)
+ && !segment_manager_has_fifos (sm))
+ segment_manager_free_safe (sm);
}
+ else
+ segment_manager_segment_reader_unlock (sm);
}
-/**
- * Allocates shm queue in the first segment
- */
-unix_shared_memory_queue_t *
-segment_manager_alloc_queue (segment_manager_t * sm, u32 queue_size)
+void
+segment_manager_detach_fifo (segment_manager_t *sm, svm_fifo_t **f)
{
- ssvm_shared_header_t *sh;
- svm_fifo_segment_private_t *segment;
- unix_shared_memory_queue_t *q;
- void *oldheap;
+ fifo_segment_t *fs;
- ASSERT (sm->segment_indices != 0);
+ fs = segment_manager_get_segment_w_lock (sm, (*f)->segment_index);
+ fifo_segment_detach_fifo (fs, f);
+ segment_manager_segment_reader_unlock (sm);
+}
- segment = svm_fifo_get_segment (sm->segment_indices[0]);
- sh = segment->ssvm.sh;
+void
+segment_manager_attach_fifo (segment_manager_t *sm, svm_fifo_t **f,
+ session_t *s)
+{
+ fifo_segment_t *fs;
- oldheap = ssvm_push_heap (sh);
- q =
- unix_shared_memory_queue_init (queue_size, sizeof (session_fifo_event_t),
- 0 /* consumer pid */ , 0
- /* signal when queue non-empty */ );
- ssvm_pop_heap (oldheap);
+ fs = segment_manager_get_segment_w_lock (sm, (*f)->segment_index);
+ fifo_segment_attach_fifo (fs, f, s->thread_index);
+ segment_manager_segment_reader_unlock (sm);
+
+ (*f)->shr->master_session_index = s->session_index;
+ (*f)->master_thread_index = s->thread_index;
+}
+
+u32
+segment_manager_evt_q_expected_size (u32 q_len)
+{
+ u32 fifo_evt_size, notif_q_size, q_hdrs;
+ u32 msg_q_sz, fifo_evt_ring_sz, session_ntf_ring_sz;
+
+ fifo_evt_size = 1 << max_log2 (sizeof (session_event_t));
+ notif_q_size = clib_max (16, q_len >> 4);
+
+ msg_q_sz = q_len * sizeof (svm_msg_q_msg_t);
+ fifo_evt_ring_sz = q_len * fifo_evt_size;
+ session_ntf_ring_sz = notif_q_size * 256;
+ q_hdrs = sizeof (svm_queue_t) + sizeof (svm_msg_q_t);
+
+ return (msg_q_sz + fifo_evt_ring_sz + session_ntf_ring_sz + q_hdrs);
+}
+
+/**
+ * Allocates shm queue in the first segment
+ *
+ * Must be called with lock held
+ */
+svm_msg_q_t *
+segment_manager_alloc_queue (fifo_segment_t * segment,
+ segment_manager_props_t * props)
+{
+ u32 fifo_evt_size, session_evt_size = 256, notif_q_size;
+ svm_msg_q_cfg_t _cfg, *cfg = &_cfg;
+ svm_msg_q_t *q;
+
+ fifo_evt_size = sizeof (session_event_t);
+ notif_q_size = clib_max (16, props->evt_q_size >> 4);
+ /* *INDENT-OFF* */
+ svm_msg_q_ring_cfg_t rc[SESSION_MQ_N_RINGS] = {
+ {props->evt_q_size, fifo_evt_size, 0},
+ {notif_q_size, session_evt_size, 0}
+ };
+ /* *INDENT-ON* */
+ cfg->consumer_pid = 0;
+ cfg->n_rings = 2;
+ cfg->q_nitems = props->evt_q_size;
+ cfg->ring_cfgs = rc;
+
+ q = fifo_segment_msg_q_alloc (segment, 0, cfg);
+
+ if (props->use_mq_eventfd)
+ {
+ if (svm_msg_q_alloc_eventfd (q))
+ clib_warning ("failed to alloc eventfd");
+ }
return q;
}
+svm_msg_q_t *
+segment_manager_event_queue (segment_manager_t * sm)
+{
+ return sm->event_queue;
+}
+
/**
* Frees shm queue allocated in the first segment
*/
void
-segment_manager_dealloc_queue (segment_manager_t * sm,
- unix_shared_memory_queue_t * q)
+segment_manager_dealloc_queue (segment_manager_t * sm, svm_queue_t * q)
{
+ fifo_segment_t *segment;
ssvm_shared_header_t *sh;
- svm_fifo_segment_private_t *segment;
void *oldheap;
- ASSERT (sm->segment_indices != 0);
+ ASSERT (!pool_is_free_index (sm->segments, 0));
- segment = svm_fifo_get_segment (sm->segment_indices[0]);
+ segment = segment_manager_get_segment_w_lock (sm, 0);
sh = segment->ssvm.sh;
oldheap = ssvm_push_heap (sh);
- unix_shared_memory_queue_free (q);
+ svm_queue_free (q);
ssvm_pop_heap (oldheap);
+ segment_manager_segment_reader_unlock (sm);
+}
+
+/*
+ * Init segment vm address allocator
+ */
+void
+segment_manager_main_init (void)
+{
+ segment_manager_main_t *sm = &sm_main;
+
+ sm->default_fifo_size = 1 << 12;
+ sm->default_segment_size = 1 << 20;
+ sm->default_app_mq_size = 128;
+ sm->default_max_fifo_size = 4 << 20;
+ sm->default_high_watermark = 80;
+ sm->default_low_watermark = 50;
+}
+
+static clib_error_t *
+segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ segment_manager_main_t *smm = &sm_main;
+ u8 show_segments = 0, verbose = 0;
+ uword max_fifo_size;
+ segment_manager_t *sm;
+ fifo_segment_t *seg;
+ app_worker_t *app_wrk;
+ application_t *app;
+ u8 custom_logic;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "segments"))
+ show_segments = 1;
+ else if (unformat (input, "verbose"))
+ verbose = 1;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+ vlib_cli_output (vm, "%d segment managers allocated",
+ pool_elts (smm->segment_managers));
+ if (verbose && pool_elts (smm->segment_managers))
+ {
+ vlib_cli_output (vm, "%-6s%=10s%=10s%=13s%=11s%=11s%=12s",
+ "Index", "AppIndex", "Segments", "MaxFifoSize",
+ "HighWater", "LowWater", "FifoTuning");
+
+ /* *INDENT-OFF* */
+ pool_foreach (sm, smm->segment_managers) {
+ app_wrk = app_worker_get_if_valid (sm->app_wrk_index);
+ app = app_wrk ? application_get (app_wrk->app_index) : 0;
+ custom_logic = (app && (app->cb_fns.fifo_tuning_callback)) ? 1 : 0;
+ max_fifo_size = sm->max_fifo_size;
+
+ vlib_cli_output (vm, "%-6d%=10d%=10d%=13U%=11d%=11d%=12s",
+ segment_manager_index (sm),
+ sm->app_wrk_index, pool_elts (sm->segments),
+ format_memory_size, max_fifo_size,
+ sm->high_watermark, sm->low_watermark,
+ custom_logic ? "custom" : "none");
+ }
+ /* *INDENT-ON* */
+
+ vlib_cli_output (vm, "\n");
+ }
+ if (show_segments)
+ {
+ vlib_cli_output (vm, "%U", format_fifo_segment, 0, verbose);
+
+ /* *INDENT-OFF* */
+ pool_foreach (sm, smm->segment_managers) {
+ segment_manager_foreach_segment_w_lock (seg, sm, ({
+ vlib_cli_output (vm, "%U", format_fifo_segment, seg, verbose);
+ }));
+ }
+ /* *INDENT-ON* */
+
+ }
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (segment_manager_show_command, static) =
+{
+ .path = "show segment-manager",
+ .short_help = "show segment-manager [segments][verbose]",
+ .function = segment_manager_show_fn,
+};
+/* *INDENT-ON* */
+
+void
+segment_manager_format_sessions (segment_manager_t * sm, int verbose)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ app_worker_t *app_wrk;
+ fifo_segment_t *fs;
+ const u8 *app_name;
+ int slice_index;
+ u8 *s = 0, *str;
+ svm_fifo_t *f;
+
+ if (!sm)
+ {
+ if (verbose)
+ vlib_cli_output (vm, "%-40s%-20s%-15s%-10s", "Connection", "App",
+ "API Client", "SegManager");
+ else
+ vlib_cli_output (vm, "%-40s%-20s", "Connection", "App");
+ return;
+ }
+
+ app_wrk = app_worker_get (sm->app_wrk_index);
+ app_name = application_name_from_index (app_wrk->app_index);
+
+ clib_rwlock_reader_lock (&sm->segments_rwlock);
+
+ /* *INDENT-OFF* */
+ pool_foreach (fs, sm->segments) {
+ for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
+ {
+ f = fifo_segment_get_slice_fifo_list (fs, slice_index);
+ while (f)
+ {
+ u32 session_index, thread_index;
+ session_t *session;
+
+ session_index = f->shr->master_session_index;
+ thread_index = f->master_thread_index;
+
+ session = session_get (session_index, thread_index);
+ str = format (0, "%U", format_session, session, verbose);
+
+ if (verbose)
+ s = format (s, "%-40v%-20v%-15u%-10u", str, app_name,
+ app_wrk->api_client_index,
+ app_wrk->connects_seg_manager);
+ else
+ s = format (s, "%-40v%-20v", str, app_name);
+
+ vlib_cli_output (vm, "%v", s);
+ vec_reset_length (s);
+ vec_free (str);
+
+ f = f->next;
+ }
+ vec_free (s);
+ }
+ }
+ /* *INDENT-ON* */
+
+ clib_rwlock_reader_unlock (&sm->segments_rwlock);
+}
+
+void
+segment_manager_set_watermarks (segment_manager_t * sm,
+ u8 high_watermark, u8 low_watermark)
+{
+ ASSERT (high_watermark <= 100 && low_watermark <= 100 &&
+ low_watermark <= high_watermark);
+
+ sm->high_watermark = high_watermark;
+ sm->low_watermark = low_watermark;
}
/*
Code Review / vpp.git / blobdiff