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/*
* 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:
*
* 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.
*/
#ifndef SRC_VNET_SESSION_SEGMENT_MANAGER_H_
#define SRC_VNET_SESSION_SEGMENT_MANAGER_H_
#include <svm/message_queue.h>
#include <vppinfra/lock.h>
#include <vppinfra/valloc.h>
#include <svm/fifo_segment.h>
typedef struct _segment_manager_props
{
u32 rx_fifo_size; /**< receive fifo size */
u32 tx_fifo_size; /**< transmit fifo size */
u32 evt_q_size; /**< event queue length */
u32 segment_size; /**< first segment size */
u32 prealloc_fifos; /**< preallocated fifo pairs */
u32 add_segment_size; /**< additional segment size */
u8 add_segment:1; /**< can add new segments flag */
u8 use_mq_eventfd:1; /**< use eventfds for mqs flag */
u8 reserved:6; /**< reserved flags */
ssvm_segment_type_t segment_type; /**< seg type: if set to SSVM_N_TYPES,
private segments are used */
} segment_manager_props_t;
typedef struct _segment_manager
{
/** Pool of segments allocated by this manager */
fifo_segment_t *segments;
/** rwlock that protects the segments pool */
clib_rwlock_t segments_rwlock;
/** Owner app worker index */
u32 app_wrk_index;
/**
* First segment should not be deleted unless segment manger is deleted.
* This also indicates that the segment manager is the first to have been
* allocated for the app.
*/
u8 first_is_protected;
/**
* App event queue allocated in first segment
*/
svm_msg_q_t *event_queue;
} segment_manager_t;
typedef struct segment_manager_main_init_args_
{
u64 baseva;
u64 size;
} segment_manager_main_init_args_t;
#define SEGMENT_MANAGER_INVALID_APP_INDEX ((u32) ~0)
segment_manager_t *segment_manager_alloc (void);
int segment_manager_init (segment_manager_t * sm, u32 first_seg_size,
u32 prealloc_fifo_pairs);
/**
* Cleanup segment manager
*
* @param sm segment manager to be freed
*/
void segment_manager_free (segment_manager_t * sm);
/**
* Initiate segment manager cleanup
*
* @param sm segment manager to be freed
*/
void segment_manager_init_free (segment_manager_t * sm);
segment_manager_t *segment_manager_get (u32 index);
segment_manager_t *segment_manager_get_if_valid (u32 index);
u32 segment_manager_index (segment_manager_t * sm);
int segment_manager_add_segment (segment_manager_t * sm, u32 segment_size);
void segment_manager_del_segment (segment_manager_t * sm,
fifo_segment_t * fs);
fifo_segment_t *segment_manager_get_segment (segment_manager_t * sm,
u32 segment_index);
fifo_segment_t *segment_manager_get_segment_w_handle (u64 sh);
fifo_segment_t *segment_manager_get_segment_w_lock (segment_manager_t * sm,
u32 segment_index);
int segment_manager_add_first_segment (segment_manager_t * sm,
u32 segment_size);
u64 segment_manager_make_segment_handle (u32 segment_manager_index,
u32 segment_index);
u64 segment_manager_segment_handle (segment_manager_t * sm,
fifo_segment_t * segment);
void segment_manager_segment_reader_unlock (segment_manager_t * sm);
void segment_manager_segment_writer_unlock (segment_manager_t * sm);
int segment_manager_alloc_session_fifos (segment_manager_t * sm,
svm_fifo_t ** rx_fifo,
svm_fifo_t ** tx_fifo);
int segment_manager_try_alloc_fifos (fifo_segment_t * fs,
u32 rx_fifo_size, u32 tx_fifo_size,
svm_fifo_t ** rx_fifo,
svm_fifo_t ** tx_fifo);
void segment_manager_dealloc_fifos (svm_fifo_t * rx_fifo,
svm_fifo_t * tx_fifo);
/**
* Grows fifo owned by segment manager
*
* @param sm segment manager that owns the fifo
* @param f fifo to be grown
* @param size amount of bytes to add to fifo
* @return 0 on success, negative number otherwise
*/
int segment_manager_grow_fifo (segment_manager_t * sm, svm_fifo_t * f,
u32 size);
/**
* Request to shrink fifo owned by segment manager
*
* If this is not called by the producer, no attempt is made to reduce the
* size until the producer tries to enqueue more data. To collect the chunks
* that are to be removed call @ref segment_manager_collect_fifo_chunks
*
* Size reduction does not affect fifo chunk boundaries. Therefore chunks are
* not split and the amount of bytes to be removed can be equal to or less
* than what was requested.
*
* @param sm segment manager that owns the fifo
* @param f fifo to be shrunk
* @param size amount of bytes to remove from fifo
* @param is_producer flag that indicates is caller is the producer for the
* fifo.
* @return actual number of bytes to be removed
*/
int segment_manager_shrink_fifo (segment_manager_t * sm, svm_fifo_t * f,
u32 size, u8 is_producer);
/**
* Collect fifo chunks that are no longer used
*
* This should not be called unless SVM_FIFO_F_COLLECT_CHUNKS is set for
* the fifo. The chunks are returned to the fifo segment freelist.
*
* @param sm segment manager that owns the fifo
* @param f fifo whose chunks are to be collected
* @return 0 on success, error otherwise
*/
int segment_manager_collect_fifo_chunks (segment_manager_t * sm,
svm_fifo_t * f);
u8 segment_manager_has_fifos (segment_manager_t * sm);
svm_msg_q_t *segment_manager_alloc_queue (fifo_segment_t * fs,
segment_manager_props_t * props);
void segment_manager_dealloc_queue (segment_manager_t * sm, svm_queue_t * q);
svm_msg_q_t *segment_manager_event_queue (segment_manager_t * sm);
u32 segment_manager_evt_q_expected_size (u32 q_size);
void segment_manager_app_detach (segment_manager_t * sm);
/**
* Cleanup segment manager sessions
*
* Initiates disconnects for all sessions 'owned' by a segment manager by
* leveraging the backpointers that fifos keep.
*
* @param sm segment manager whose sessions are to be disconnected
*/
void segment_manager_del_sessions (segment_manager_t * sm);
void segment_manager_format_sessions (segment_manager_t * sm, int verbose);
void segment_manager_main_init (segment_manager_main_init_args_t * a);
segment_manager_props_t *segment_manager_props_init (segment_manager_props_t *
sm);
#endif /* SRC_VNET_SESSION_SEGMENT_MANAGER_H_ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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