[657] | 1 | /* |
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| 2 | * remote_buf.h - Remotely accessible, circular buffer definition. |
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| 3 | * |
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| 4 | * Authors : |
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| 5 | * Alain Greiner (2016,2017,2018,2019,2020) |
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| 6 | * |
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| 7 | * Copyright (c) UPMC Sorbonne Universites |
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| 8 | * |
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| 9 | * This file is part of ALMOS-MKH. |
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| 10 | * |
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| 11 | * ALMOS-MHH is free software; you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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| 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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| 25 | #ifndef _REMOTE_BUFFER_H_ |
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| 26 | #define _REMOTE_BUFFER_H_ |
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| 27 | |
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| 28 | #include <kernel_config.h> |
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| 29 | #include <hal_kernel_types.h> |
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| 30 | |
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| 31 | /************************************************************************************ |
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| 32 | * This structure and the associated access functions define a remotely accessible, |
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| 33 | * kernel buffer, handled as a single-reader & single-writer FIFO. |
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[666] | 34 | * This kernel buffer is implementes as an array of bytes, whose size is |
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| 35 | * dynamically defined by an argument of the "remote_buf_init()" function. |
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| 36 | * The "put()" and "get()" functions defined below move the content of another |
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| 37 | * buffer (can be in kernel or in user space) to/from this circular kernel buffer. |
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[657] | 38 | * This structure is NOT protected by a lock, as the only shared variable is the |
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[666] | 39 | * "sts" variable, that is updated by the hal_remote_atomic_add() primitive. |
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| 40 | * It is used to implement the three socket buffers (rx_buf / r2tq / crqq). |
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[657] | 41 | * - the "ptw" field defines the first empty slot (for write). |
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| 42 | * - the "ptr" field defines the first non empty slot (for read). |
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| 43 | * - the "sts" field defines the total number of non empty slots. |
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| 44 | ***********************************************************************************/ |
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| 45 | |
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| 46 | typedef struct remote_buf_s |
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| 47 | { |
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| 48 | uint32_t size; /*! number of slots in data buffer */ |
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| 49 | uint32_t ptw; /*! first empty slot index */ |
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| 50 | uint32_t ptr; /*! first non-empty slot index */ |
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| 51 | uint32_t sts; /*! current number of non empty slots */ |
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| 52 | uint8_t * data; /*! local pointer on local data buffer */ |
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| 53 | } |
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| 54 | remote_buf_t; |
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| 55 | |
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| 56 | /************************************************************************************ |
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| 57 | * This function initializes a remote_buf descriptor identified by the <buf_xp> |
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| 58 | * argument. It allocates memory for the data, as defined by the <size> argument, |
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| 59 | * and initializes the buffer as empty. It must be called by a local thread. |
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[666] | 60 | * No memory is allocated if <size> value is 0. |
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[657] | 61 | ************************************************************************************ |
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| 62 | * @ buf_xp : [in] extended pointer on buffer descriptor. |
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[666] | 63 | * @ size : [in] number of bytes in buffer / no memory allocated when null. |
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| 64 | * @ return 0 if success / return -1 if memory failure. |
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[657] | 65 | ***********************************************************************************/ |
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[666] | 66 | error_t remote_buf_init( xptr_t buf_xp, |
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| 67 | uint32_t size ); |
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[657] | 68 | |
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| 69 | /************************************************************************************ |
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| 70 | * This function releases memory allocated for the data buffer of a remote-buf |
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| 71 | * descriptor identified by the <buf_xp> argument. |
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| 72 | * It must be called by a local thread. |
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| 73 | ************************************************************************************ |
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| 74 | * @ buf_xp : [in] extended pointer on buffer descriptor. |
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| 75 | ***********************************************************************************/ |
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| 76 | void remote_buf_destroy( xptr_t buf_xp ); |
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| 77 | |
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| 78 | /************************************************************************************ |
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| 79 | * This function initialises as empty a buffer identified by the <buf_xp> argument. |
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| 80 | * It can be called by a thread runing in any cluster. |
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| 81 | ************************************************************************************ |
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| 82 | * @ buf_xp : [in] extended pointer on remote buffer descriptor. |
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| 83 | ***********************************************************************************/ |
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| 84 | void remote_buf_reset( xptr_t buf_xp ); |
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| 85 | |
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| 86 | /************************************************************************************ |
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| 87 | * This function moves <nbytes> from a remote_buf_t identified by the <buf_xp> |
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| 88 | * argument to an user buffer identified by the <u_buf> argument. |
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| 89 | * It uses the hal_copy_to_uspace() function, and updates "sts" and "ptr". |
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| 90 | * The calling function is supposed to previously check the buffer status. |
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| 91 | * It can be called by a thread runing in any cluster. |
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| 92 | ************************************************************************************ |
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| 93 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 94 | * @ u_buf : [in] pointer on destination user buffer in user space. |
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| 95 | * @ nbytes : [in] number of bytes to move. |
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| 96 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 97 | ***********************************************************************************/ |
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| 98 | error_t remote_buf_get_to_user( xptr_t buf_xp, |
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| 99 | uint8_t * u_buf, |
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| 100 | uint32_t nbytes ); |
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| 101 | |
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| 102 | /************************************************************************************ |
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| 103 | * This function moves <nbytes> from a remote_buf_t identified by the <buf_xp> |
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| 104 | * argument to a local kernel buffer identified by the <k_buf> argument. |
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| 105 | * It uses an hal_remote_memcpy() function, and updates the "sts" and "ptr" fields. |
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| 106 | * The calling function is supposed to previously check the buffer status. |
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| 107 | * It can be called by a thread runing in any cluster. |
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| 108 | ************************************************************************************ |
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| 109 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 110 | * @ k_buf : [in] local pointer on local destination kernel buffer. |
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| 111 | * @ nbytes : [in] number of bytes to move. |
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| 112 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 113 | ***********************************************************************************/ |
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| 114 | error_t remote_buf_get_to_kernel( xptr_t buf_xp, |
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| 115 | uint8_t * k_buf, |
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| 116 | uint32_t nbytes ); |
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| 117 | |
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| 118 | /************************************************************************************ |
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| 119 | * This function moves <nbytes> from an user buffer identified by the <u_buf> |
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| 120 | * argument to a remote_buf_t identified by the <buf_xp> argument. |
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| 121 | * It uses the hal_copy_from_uspace() function, and updates "sts" and "ptw".. |
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| 122 | * The calling function is supposed to previously check the buffer status. |
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| 123 | * It can be called by a thread runing in any cluster. |
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| 124 | ************************************************************************************ |
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| 125 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 126 | * @ u_buf : [in] pointer on source user buffer in user space. |
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| 127 | * @ nbytes : [in] number of bytes to move. |
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| 128 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 129 | ***********************************************************************************/ |
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| 130 | error_t remote_buf_put_from_user( xptr_t buf_xp, |
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| 131 | uint8_t * u_buf, |
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| 132 | uint32_t nbytes ); |
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| 133 | |
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| 134 | /************************************************************************************ |
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| 135 | * This function moves <nbytes> from a local kernel buffer identified by the <k_buf> |
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| 136 | * argument to a remote_buf_t identified by the <buf_xp> argument. |
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| 137 | * It uses an hal_remote_memcpy() function, and updates the "sts" and "ptw" fields. |
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| 138 | * The calling function is supposed to previously check the buffer status. |
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| 139 | * It can be called by a thread runing in any cluster. |
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| 140 | ************************************************************************************ |
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| 141 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 142 | * @ k_buf : [in] local pointer on local source kernel buffer. |
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| 143 | * @ nbytes : [in] number of bytes to move. |
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| 144 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 145 | ***********************************************************************************/ |
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| 146 | error_t remote_buf_put_from_kernel( xptr_t buf_xp, |
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| 147 | uint8_t * k_buf, |
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| 148 | uint32_t nbytes ); |
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| 149 | |
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| 150 | /************************************************************************************ |
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| 151 | * This function returns the current number of bytes stored in buffer. |
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| 152 | ************************************************************************************ |
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| 153 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 154 | * @ return current number of bytes in buffer. |
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| 155 | ***********************************************************************************/ |
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| 156 | uint32_t remote_buf_status( xptr_t buf_xp ); |
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| 157 | |
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| 158 | #endif /* _REMOTE_BUFFER_H_ */ |
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