9cee4926f9
Introduce a new module WBUFF, which maintains a pre-allocated pool of skbs for each registered module and allocates skbs when requeted from these pre-allocated pools. The module exposes the following APIs: 1) wbuff_module_init 2) wbuff_module_deinit 3) wbuff_module_register 4) wbuff_module_deregister 5) wbuff_buff_get 6) wbuff_buff_put Change-Id: Icab723ce29a9a364c822756dee78a0dae1006180 CRs-Fixed: 2313443
152 行
3.8 KiB
C
152 行
3.8 KiB
C
/*
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* Copyright (c) 2018 The Linux Foundation. All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for
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* any purpose with or without fee is hereby granted, provided that the
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* above copyright notice and this permission notice appear in all
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* copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* DOC: wbuff.h
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* wbuff buffer management APIs
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*/
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#ifndef _WBUFF_H
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#define _WBUFF_H
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#include <qdf_status.h>
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#include <qdf_nbuf.h>
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/* wbuff available pools */
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/* Pool of nbuf size 256 bytes */
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#define WBUFF_POOL_0 0
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/* Pool of nbuf size 512 bytes */
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#define WBUFF_POOL_1 1
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/* Pool of nbuf size 1024 bytes */
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#define WBUFF_POOL_2 2
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/* Pool of nbuf 2048 bytes */
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#define WBUFF_POOL_3 3
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/**
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* struct wbuff_alloc_request - allocation structure for registering each
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* pool for wbuff module.
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* @slot: pool_slot identifier
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* @size: number of buffers for @pool_slot
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*/
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struct wbuff_alloc_request {
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uint8_t slot;
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uint16_t size;
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};
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/* Opaque handle for wbuff */
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struct wbuff_mod_handle;
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#ifdef WLAN_FEATURE_WBUFF
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/**
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* wbuff_module_init() - Initializes the wbuff module
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*
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* Return: QDF_STATUS_SUCCESS - init success
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* QDF_STATUS_E_NOSUPPORT - init failure
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*/
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QDF_STATUS wbuff_module_init(void);
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/**
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* wbuff_module_deinit() - De-initializes the wbuff module
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*
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* Return: QDF_STATUS_SUCCESS - de-init success
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* QDF_STATUS_E_INVAL - de-init failure (wbuff not initialized)
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*/
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QDF_STATUS wbuff_module_deinit(void);
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/**
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* wbuff_module_register() - Registers a module with wbuff
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* @req: allocation request from registered module
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* @num: number of pools required
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* @reserve: nbuf headroom to start with
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* @align: alignment for the nbuf
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*
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* Return: Handle if registration success
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* NULL if registration failure
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*/
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struct wbuff_mod_handle *
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wbuff_module_register(struct wbuff_alloc_request *req, uint8_t num,
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int reserve, int align);
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/**
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* wbuff_module_deregister() - De-registers a module with wbuff
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* @hdl: wbuff_handle corresponding to the module
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*
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* Return: QDF_STATUS_SUCCESS - deregistration success
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* QDF_STATUS_E_INVAL - deregistration failure
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*/
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QDF_STATUS wbuff_module_deregister(struct wbuff_mod_handle *hdl);
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/**
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* wbuff_buff_get() - return buffer to the requester
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* @handle: wbuff_handle corresponding to the module
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* @len: length of buffer requested
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*
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* Return: Network buffer if success
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* NULL if failure
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*/
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qdf_nbuf_t wbuff_buff_get(struct wbuff_mod_handle *hdl, uint32_t len);
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/**
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* wbuff_buff_put() - put the buffer back to wbuff pool
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* @hdl: wbuff_handle corresponding to the module
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* @buf: pointer to network buffer
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*
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* Return: NULL if success (buffer consumed)
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* @buf if failure (buffer not consumed)
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*/
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qdf_nbuf_t wbuff_buff_put(qdf_nbuf_t buf);
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#else
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static inline QDF_STATUS wbuff_module_init(void)
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{
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return QDF_STATUS_E_NOSUPPORT;
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}
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static inline QDF_STATUS wbuff_module_deinit(void)
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{
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return QDF_STATUS_E_NOSUPPORT;
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}
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static inline struct wbuff_mod_handle *
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wbuff_module_register(struct wbuff_alloc_request *req, uint8_t num,
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int reserve, int align)
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{
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return NULL;
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}
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static inline QDF_STATUS wbuff_module_deregister(struct wbuff_mod_handle *hdl)
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{
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return QDF_STATUS_E_NOSUPPORT;
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}
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static inline qdf_nbuf_t
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wbuff_buff_get(struct wbuff_mod_handle *hdl, uint32_t len)
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{
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return NULL;
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}
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static inline qdf_nbuf_t
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wbuff_buff_put(qdf_nbuf_t buf)
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{
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return buf;
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}
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#endif
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#endif /* _WBUFF_H */
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